JP6615478B2 - Manufacturing method of resin molded product using metal insert parts - Google Patents

Description

  The present invention relates to a metal insert part capable of melting a resin existing on a joining surface between a metal and a resin by high-frequency induction heating to improve adhesion or adhesion of the joint, and a resin molded product using the metal insert part. Regarding the method.

  Regarding the method for joining metal parts and resin, as proposed in Patent Document 1, a chemical etching process is performed on the metal surface to form fine irregularities, and the resin melted during insert molding is infiltrated into the irregularities. A method of physically joining the resin and metal by the effect of anchors (crews) formed after the resin is cooled and hardened, or melting the resin on the metal / resin joint surface by high-frequency heating as proposed in Patent Document 2. A method of joining them together has been proposed.

International Publication No. 2008/047811 JP-A-5-237934

  The method using the anchor effect disclosed in Patent Document 1 appropriately controls the temperature (viscosity) of the molten resin and the pressure at the time of injection molding in order to sufficiently exert its effect. Although necessary, it is difficult to positively and accurately adjust the heat and pressure during molding. This can be easily imagined from general knowledge that the resin temperature in the molding machine nozzle at the time of the resin molding operation and the resin temperature of each part inside the mold do not exactly match.

  In addition, the method disclosed in Patent Document 2 for melting and bonding a resin on a metal / resin bonding surface by high-frequency heating causes the resin to soften and melt by heat due to high-frequency heating, and a part of the resin layer is bonded to the bonding surface. However, the phenomenon that a part of the resin layer is pushed out of the joint surface leads to a decrease in resin density, and the resin and metal parts. It is disadvantageous when viewed from the viewpoint of ensuring airtightness.

  An object of the present invention is to perform an insert mold made of a resin material and a metal material, which is airtight and has excellent durability, and is necessary when high frequency induction heating is used for joining the resin and the metal. Another object of the present invention is to provide a metal insert part having a joint structure suitable for controlling the temperature (viscosity) of the resin and metal insert contact portion, and a method for producing a resin molded product using the metal insert part.

The configuration of the present invention is as follows.
[1] The present invention is a method for producing a resin molded product having a metal insert part and a resin,
The resin molded product includes a portion covered with the resin on at least a part of an outer edge of the metal insert part, and a metal exposed part of the metal insert part not covered with the resin,
At least a part of the outer edge of the metal insert part has a portion that generates heat when receiving a high-frequency induced wave as a portion for suppressing heat conduction from the portion that generates heat when receiving the high-frequency induced wave. Is provided on the outermost periphery of the outer edge of the metal insert part through a part formed so that the cross-sectional area becomes smaller than the part that generates heat.
Using the metal insert part, a step of resin molding by injection molding, compression molding or transfer molding,
A resin comprising: a step of performing induction heating by providing a high-frequency induction device at a location where a resin existing on a joint surface between a metal and a resin is melted at least at a part of an outer edge of the metal insert component; and a cooling step A method for producing a molded product is provided.
[2] In the present invention, when the portion for suppressing heat conduction from the portion that generates heat upon receiving the high frequency induction wave extends the exposed metal portion of the metal insert component toward the outer edge of the metal insert component. The method for producing a resin molded product according to [1], wherein the method has a cross-sectional area smaller than a cross-section of a portion in contact with the portion for suppressing the heat conduction.
[3] In the present invention, the portion for suppressing heat conduction from the portion that generates heat upon receiving the high-frequency induced wave has a groove so that the cross-sectional area is smaller than the portion that generates heat upon receiving the high-frequency induced wave. The method for producing a resin molded product according to the above [2], wherein a metal insert part in which at least one of a hole and a hole is formed is used.
[4] In the present invention, the portion that generates heat upon receiving the high-frequency induced wave and the portion for suppressing heat conduction from the portion that generates heat upon receiving the high-frequency induced wave have a circular or elliptical cross-sectional shape, and The method for producing a resin molded product according to any one of [1] to [3], wherein metal insert parts made of a combination of rectangles are used.
[5] In the present invention, the part that generates heat upon receiving the high-frequency induced wave has a circular or elliptical cross-sectional shape, and the part for suppressing heat conduction from the part that generates heat upon receiving the high-frequency induced wave is provided. The method for producing a resin molded product according to the above [4], wherein a metal insert part having a rectangular cross section is used.
[6] The present invention is a method for producing a resin molded product having a metal insert part and a resin,
The resin molded product includes a portion covered with the resin on at least a part of an outer edge of the metal insert component, and a metal exposed portion of the insert component not covered with the resin,
At least a part of the outer edge of the metal insert part has at least a part that generates heat when receiving a high-frequency induced wave as a part for suppressing heat conduction from the part that generates heat when receiving the high-frequency induced wave. Through the part made of a material having a larger thermal resistance than the part that generates heat by receiving the high-frequency induction wave, provided on the outermost periphery of the outer edge of the metal insert part,
Using the metal insert part, a step of resin molding by injection molding, compression molding or transfer molding,
A resin comprising a step of performing induction heating by providing a high-frequency induction device at a location where the resin existing on the joint surface between the metal and the resin is melted in at least a part of the outer edge of the metal insert component, and a cooling step A method for producing a molded product is provided.
[7] In the present invention, the material having a higher thermal resistance than the portion that generates heat upon receiving the high-frequency induced wave is at least one of a metal, a resin, and a ceramic that have lower thermal conductivity than the portion that generates heat upon receiving the high-frequency induced wave. The method for producing a resin molded product according to [6] above, wherein one metal insert part is used.
[8] The present invention is a method for producing a resin molded product having a metal insert part and a resin,
The resin molded product has a portion covered with the resin on at least a part of an outer edge of the metal insert part, and a metal exposed part of the metal insert part not covered with the resin,
At least a part of the outer edge of the metal insert part has a portion that generates heat when receiving a high-frequency induced wave as a portion for suppressing heat conduction from the portion that generates heat when receiving the high-frequency induced wave. The cross-sectional thickness, the length of the part for suppressing the heat conduction, and the exposed metal part of the metal insert part at the outer edge of the metal insert part. when extending toward the cross-sectional thickness of the part abutting portion for suppressing the heat conducting, when the t _1, L _1, and T _1, respectively, the t _1, L _1, and T ₁ Is provided on the outermost periphery of the outer edge of the metal insert part through a portion formed so as to satisfy the following formulas (1) and (2):
T ₁ > t ₁ (1)
L ₁ / t ₁ ≧ 3 (2)
Using the metal insert part, a step of resin molding by injection molding, compression molding or transfer molding,
A resin comprising: a step of performing induction heating by providing a high-frequency induction device at a location where a resin existing on a joint surface between a metal and a resin is melted at least at a part of an outer edge of the metal insert component; and a cooling step Manufacturing method of molded products.
[9] In the present invention, the portion for suppressing heat conduction from the portion that generates heat upon receiving the high-frequency induced wave has a groove so that the cross-sectional area is smaller than the portion that generates heat upon receiving the high-frequency induced wave. The method for producing a resin molded product according to [8] above, wherein a metal insert part in which at least one of a hole and a hole is formed is used.
[10] In the present invention, at least a part of the outer edge of the metal insert part is a part that generates heat by receiving a high frequency induction wave, a part for suppressing heat conduction from a part that generates heat by receiving the high frequency induction wave, And, in order to express the anchoring effect of the resin existing on the joint surface between the metal and the resin by forming with a cross-sectional area larger than the cross section of the exposed metal portion of the metal insert part not covered with the resin The method of manufacturing a resin molded product according to any one of [1] to [9], wherein the metal insert parts provided in this order from the outermost outer periphery of the outer edge of the metal insert part are used. I will provide a.
[11] The present invention uses a metal insert component in which the portion that generates heat upon receiving the high-frequency induced wave is provided on one of the outer peripheral portion and the inner peripheral portion of the end portion of the metal tubular body or on both outer peripheral portions thereof. A method for producing a resin molded product according to any one of the above [1] to [5] is provided.
[12] The present invention is characterized in that the metal insert part is a metal tubular body, and uses a metal insert part in which an end cross section of a portion that generates heat upon receiving the high frequency induction wave is divided into two or more. Provided is a method for producing a resin molded product according to any one of [1] to [3].
[13] In the present invention, an end cross section of a part that generates heat by receiving the high-frequency induced wave is divided into two or more by a cut or a groove, and the one divided part receives the high-frequency induced wave. It includes a portion for suppressing heat conduction from a portion that generates heat, and has a cross-sectional thickness at a tip portion of the one divided portion, and a length of a portion for suppressing heat conduction upon receiving the high-frequency induction wave It is, and the cross-sectional thickness of the metal insert part before the split, when a _t 2, _{L 2,} and _{T 2,} respectively, wherein _t 2, _{L 2,} and _{T 2} is the following (3) and (4) The method for producing a resin molded product according to [12], wherein a metal insert part satisfying the formula is used.
T ₂ > t ₂ (3)
L ₂ / t ₂ ≧ 3 (4)
[14] The present invention according to any one of [1] to [13], wherein the metal insert component is subjected to a surface treatment for promoting bonding with a resin material on a surface thereof. A method for producing a resin molded product is provided.
[The invention's effect]

  The metal insert part of this invention can improve the adhesiveness or adhesiveness of joining by performing a high frequency induction heating process. Thereby, compared with a resin molded product having a conventional metal insert structure, the airtightness of the resin molded product can be greatly improved, and various highly reliable insert molded products can be manufactured.

  The metal insert component of the present invention can be applied to a planar metal insert resin molded product by providing a portion that generates heat upon receiving a high frequency induction wave on the outermost periphery of the outer edge along the shape of the metal insert component. . In addition, by providing a portion that generates heat by receiving a high-frequency induced wave in either the outer peripheral portion of the end portion of the metal tubular body and the inner peripheral portion of the end portion or both of the outer peripheral portions thereof, one end portion of the metallic tubular body is provided. Application as a resin molded product having a structure inserted inside the resin tubular body or a structure joined at a desired position outside the resin tubular body is possible. Thus, the metal insert component of the present invention can broaden the application of various insert resin molded products having various structures and uses.

It is a figure which shows an example of the insert mold component external appearance of a simple structure. It is a figure which shows the AA cross section of FIG. It is a figure which shows the relationship of the specific volume with respect to the temperature change of a general resin material. It is a figure which shows the principle of induction heating typically. It is a figure which shows one Example of this invention. It is a figure which shows the detail of the part of the coupling | joint part 2a of FIG. It is a figure which shows another example of arrangement | positioning of the high frequency induction coil 6 used in one Example of this invention shown in FIG. It is a figure which shows the Example by Embodiment 2 of this invention. In the metal insert part of this invention, it is a figure which shows the Example which has a site | part for expressing the anchoring effect further. It is a figure which shows another Example of this invention that the cross-sectional shape of the site | part from which a 1st cross-sectional area differs is a square. It is a figure which shows another Example of this invention from which the site | part from which the 1st cross-sectional area of insert components differs, and the number of thin parts differ. It is a figure which shows another Example of this invention in which the site | part from which a 1st cross-sectional area differs is not set. It is a figure which shows another Example of this invention whose thin-walled part shown by the linear shape in FIG. 11 is a wavy shape. It is a figure which shows another Example of this invention which has the cross-sectional thickness of an insert component, and the cross-sectional thickness of a joint part which has the same combination. It is a figure which shows another Example of this invention which has the structure whose cross-sectional thickness of a joint part is larger than the cross-sectional thickness of insert components. It is a figure which shows the Example of this invention by the metal tubular body which provided the site | part which generate | occur | produces heat in response to a high frequency induction wave in cylindrical shape. It is sectional drawing which shows another Example of this invention by the metal tubular body which provided the site | part which generate | occur | produces heat in response to a high frequency induction wave in cylindrical shape. It is sectional drawing which shows the Example of this invention by the metal tubular body which provided the notch part in the outer wall near the site | part which generate | occur | produces heat by receiving a high frequency induction wave. It is sectional drawing which shows the Example of this invention by the metal tubular body by which the edge part cross section of the site | part which generate | occur | produces heat by receiving a high frequency induction wave was divided into two. It is sectional drawing which shows the method of joining the metal tubular body by which the edge part cross section of the site | part which generate | occur | produces heat by receiving a high frequency induction wave was divided with the flat plate of the resin tubular body. It is sectional drawing which shows the method of joining the metal tubular body by which the groove | channel was provided in the edge part cross section of the site | part which generate | occur | produces heat by receiving a high frequency induction wave with the flat plate of a resin tubular body. It is sectional drawing which shows the Example by Embodiment 9 of this invention.

  Hereinafter, the configuration of an insert mold of a resin material and a metal material according to an embodiment of the present invention and the operation of each part will be described with reference to the drawings.

  FIG. 1 shows an example of the appearance of an insert mold part having a very simple configuration. It consists of a resin part 1 and an insert metal part 2.

  FIG. 2 shows a cross section taken along the line A-A in FIG. 1. Generally, the structure of the insert mold part of the metal part is as described above so that the joint part 2 a of the insert metal part 2 is surrounded inside the resin part 1. The insert metal part 2 is fixed.

  Here, a method of applying temperature and pressure to the resin around the joint portion 2a, which has been difficult to control during the resin molding operation as described in the item of the problem to be solved, will be described.

  FIG. 3 shows the relationship of the specific volume to the temperature change of a general resin material. In the graph, the horizontal axis represents the resin temperature and the vertical axis represents the specific volume, and the portion of the graph where the curve changes greatly indicates the melting phenomenon (melting point) of the resin, and the specific volume increases rapidly. As described above, the resin material generally exhibits a characteristic in which the specific volume largely varies with the melting point.

  Here, considering the case where the resin material is confined in a closed space and the temperature of the resin material rises, the resin material increases in specific volume at the melting point but is confined in the closed space. Cannot change in volume, and eventually appears as a pressure increase phenomenon of the resin material. In other words, if the temperature of the joint portion 2a portion of the insert metal part 2 is increased inside the resin portion 1, the pressure at the portion naturally increases.

となる。
ここで、Ｐ：圧力、ν：比容積であり、
βの逆数を体積弾性係数（bulk modulus）と呼び、Ｋで表す。
Ｋ＝１／β なので、

と表すことができる。
この式を変形すると、圧力変化ｄＰが下記の（５）式で表される。

When this phenomenon is calculated by taking an example where the curve in the graph of FIG. 3 is greatly changed, in the case of the compression ratio β, the change in the specific volume ν with respect to the pressure change dP is:

It becomes.
Where P: pressure, ν: specific volume,
The reciprocal of β is called bulk modulus and is represented by K.
Since K = 1 / β,

It can be expressed as.
When this equation is transformed, the pressure change dP is expressed by the following equation (5).

As described above, the pressure P is a function having the volume elastic modulus K and the specific volume ν, which are specific values depending on the resin material, as variables, and the pressure P can be derived from the volume elastic modulus K and the specific volume ν. As an example using this relationship, when the resin part 1 near the joint part 2a of the insert part 2 in the insert mold part using the resin material having the characteristics shown in FIG. 3 is heated and the resin near the part melts. Obtain the pressure rise value of. Figure 3 is a = a when Examples ^{ν 0.664 (mm 3 /kg),dν=0.686-0.664=0.022(mm 3 /} kg). In addition, since the bulk modulus K = 1.63 × 10 ⁹ (Pa) in the resin material of this example, when substituting into Equation 1,
dP = 1.63 × 10 ⁹ × (0.022 / 0.664) ≒ 54 (MPa)
It becomes. Thus, it can be seen that the pressure can be increased by applying a temperature exceeding the melting point in the case of the resin of this example.

  Next, a method for heating the resin part 1 in the vicinity of the joint part 2a of the insert part 2 will be described. Here, heating the resin part 1 in the vicinity of the joint part 2a is equivalent to heating the joint part 2a part of the insert part 2.

  Since the joint part 2a of the insert part 2 is provided inside the resin part 1, it is obvious that heating from the outside of the resin part 1 using a heater or the like is impossible. Therefore, it is most reasonable to use a method of heating using high frequency induction heating, paying attention to the fact that the insert part is a metal.

  FIG. 4 schematically shows the principle of induction heating. In addition, the said resin part 1 is not illustrated in this figure. When a high frequency induction coil 6 is provided in the vicinity of the insert part 2 and an alternating current is applied to the high frequency induction coil 6 by the oscillator 7, for example, when a current flows in the direction of arrow B in the high frequency induction coil 6, the high frequency induction coil 6 of the insert part 2 A current flows in the direction of the arrow C opposite to the arrow B in the part facing the. When the current flows through the insert part 2, it self-heats due to the action of the specific resistance of the insert part 2. At this time, if the alternating current is a high frequency, it is generally known as a skin effect of the high frequency induction heating that the current concentrates and flows near the surface of the insert part 2 and close to the high frequency induction coil 6.

<Embodiment 1>
FIG. 5 shows a more practical embodiment of the present invention. In the high-frequency induction heating, the outermost peripheral portion 2b of the outer edge of the insert part 2 is concentratedly heated by the current applied to the high-frequency induction coil 6, as described above. The surface temperature of the outermost peripheral portion 2b rises, and then the temperature of the portion 4 having a different first cross section rises. In the present invention, the portion 4 having a different first cross section corresponds to “a portion that generates heat upon receiving a high frequency induction wave”.

  In this structure, since the thin-walled portion 3 is provided inside the portion 4 having a different first cross section located at the outermost peripheral portion 2b of the outer edge, the first cross section is heated by high frequency induction heating and has a different temperature. When the heat of the part 4 is transmitted in the D direction by the heat conduction action of the insert part 2, the cross-sectional area of the inner thin part 3 is small, so that the heat resistance acts as a part having a large thermal resistance. Since the transfer of heat to is suppressed (or inhibited), the temperature of the portion 4 having a different first cross section increases intensively.

  That is, in a short period of high-frequency induction heating of about several seconds, the resin material of the resin part 1 that is in contact with the different parts 4 of the first cross section can be locally heated above the melting point of the resin, Similarly, the temperature in the vicinity of the exposed end 2c of the insert part 2 may be set to a temperature equal to or lower than the melting point of the resin material by suppressing (or inhibiting) heat transfer in the D direction by the inner thin portion 3. Since it can do, only the part 4 from which the said 1st cross section differs inside the said resin part 1 can be heated. In the present invention, the thin portion 3 corresponds to “a portion for suppressing heat conduction from a portion that generates heat upon receiving a high frequency induction wave”.

  The “part for suppressing heat conduction from a part that generates heat upon receiving a high frequency induction wave” may be one in which at least one of a groove, a hole, and a hole is formed. Accordingly, the cross-sectional area of the portion for suppressing heat conduction is substantially smaller than the portion that generates heat upon receiving the high frequency induction wave.

  Further, the “part for suppressing heat conduction from the part that generates heat upon receiving the high-frequency induced wave” is a part that at least partially receives the high-frequency induced wave and generates heat in addition to reducing the cross-sectional area. 4 can be made of a material having a thermal resistance greater than 4. For example, when grooves, holes, and holes are formed in the thin-walled portion 3 shown in FIG. 5, a part of the resin that constitutes the resin portion 1 has a structure that fills the portions of the grooves, holes, and holes. It has the same function as that made of a material having a higher thermal resistance than the portion 4 that generates heat upon receiving a high frequency induction wave. Further, the periphery of the thin portion 3 may be covered with another resin having high adhesiveness or adhesion to the resin portion 1. Further, as another method of forming the thin portion 3, using another metal or ceramic having a lower thermal conductivity than the portion 4 that generates heat upon receiving the high frequency induction wave, connection by soldering, soldering or brazing, etc. Bonding or ceramic injection or sintering may be performed.

  As described above, in this configuration, it is possible to prevent the molten resin from eluting from the exposed end 2c portion to the outside, and the resin density on the surface of the insert part 2 is not reduced, thereby preventing the deterioration of the airtight performance due to the density reduction of the resin material. can do.

FIG. 6 shows details of the joint portion 2a.
By the high frequency induction heating, the resin part 1 that is in contact with the part indicated by the arrow on the surface of the outer edge part 2b is melted to become a joint surface.

  In addition, a shape transition portion 4a having a partial arc shape is provided at the cross-section transition portion between the thin portion 3 and the portion 4 having the first cross-sectional area different from each other. The action of the shape transition portion 4a is a shape well known in engineering to cope with stress concentration relaxation at a portion where the cross-sectional shape changes, and the shape transition portion 4a not only to this portion but also to the portion where the cross-section changes. Setting is required, and setting is also required for each figure shape example used in the following description although not shown.

FIG. 7 shows an arrangement example of the high-frequency induction coil 6 taking FIG. 5 as an example.
In the high frequency induction heating, the arrangement of the high frequency induction coil 6 is 6-I, 6-II, 6-III, etc. due to the property that current concentrates near the surface of the insert part 2 and near the high frequency induction coil 6. This is true regardless of the position.

<Embodiment 2>
FIG. 8 shows another embodiment of the present invention. The metal insert component shown in FIG. 8 (a) has the same cross section as the portion 4 where the thin-walled portion 3 for suppressing heat conduction from the portion that generates heat upon receiving the high-frequency induced wave receives heat at the high-frequency induced wave. Has a shape. That is, this is an example in which a portion having a different first cross-sectional area is not set. The thin-walled portion 3 has the same cross-sectional thickness as the portion 4 that generates heat upon receiving a high-frequency induced wave, but receives heat from the high-frequency induction coil 6 at the outermost peripheral portion 2b of the outer edge of the portion 4 that generates heat upon receiving the high-frequency induced wave. Thus, when the heat transfer length required from the thermal resistance value is sufficiently secured in the thin portion 3, the effect of the present invention can be achieved. That is, the length (L ₁ ) of the thin-walled portion 3 corresponding to the portion for suppressing the heat conduction in order to suppress the heat conduction so that the time for heating the outermost peripheral portion 2b of the outer edge is sufficiently secured by the high frequency induction heating. Should be lengthened. Since the heat transferability in the thin portion 3 is determined by the length (L ₁ ) of the thin portion 3 and the thickness (t ₁ ) of the thin portion 3 that is the same as the cross-sectional thickness of the portion 4, the ratio (L ₁ / t ₁ ) of both. It is practical to set in a direction to increase the).

FIG. 8B is a schematic diagram showing the basic concept when determining the ratio of the length (L ₁ ) to the cross-sectional thickness (t ₁ ) in the thin portion 3. In FIG. 8B, the heating point target temperature corresponds to the heating temperature of the heating point (the outermost peripheral portion 2b of the outer edge), and the cross-sectional area change point target temperature is a portion for suppressing heat conduction with the metal insert part 2. This corresponds to the temperature at the boundary with the thin-walled portion 3. As shown in FIG. 8 (b), it is necessary to increase the length (L ₁ ) of the portion of the thin portion 3 as the cross-sectional thickness (t ₁ ) of the thin portion 3 increases. Therefore, as a result of examining in detail the relationship between the ratio (L ₁ / t ₁ ) between the two and the heat transferability of the thin-walled portion 3 corresponding to the portion that suppresses heat conduction, when L ₁ / t ₁ ≧ 3 or more It was found that the effects of the present invention were achieved. When L ₁ / t ₁ is less than 3, the heat conduction from the outermost peripheral portion 2b of the outer edge of the portion 4 that generates heat by receiving a high frequency induction wave is increased, and the boundary portion between the metal insert part 2 and the thin portion 3 is increased. Melting of the resin present in the vicinity was observed. Further, in the present invention, in order to suppress the heat from the portion 4 that generates heat upon receiving the high frequency induction wave from being conducted to the metal insert component 2, the cross-sectional thickness (T ₁₎ of the metal insert component is used as a portion to suppress the heat conduction. It is necessary to provide a thin portion 3 having a thinner thickness (t ₁ ).

Therefore, when the metal insert part of the present invention has the structure shown in FIG. 8A, it is necessary to satisfy the following expressions (1) and (2).

  In the present embodiment, the thin-walled portion 3 shown in FIG. 8 improves the function of suppressing heat conduction, so that the cross-sectional area is substantially reduced. At least one of them may be formed.

<Embodiment 3>
FIG. 9 is a view showing an embodiment in which the metal insert part of the present invention further has a portion for expressing the anchoring effect.
The symbols and symbols in the figure that are the same as those in FIG. 5 have the same part names and functions disclosed in FIG. In the present embodiment, a portion 5 having a different second cross-sectional area is added. The portion 5 having a different second cross-sectional area has a larger cross-sectional area than the portion not covered with the resin portion inside the resin portion 1. As a result, when the insert part 2 receives an external force with respect to the resin part 1, a macro shift between the resin part 1 and the insert part 2 is prevented by the anchor effect of the part 5. The term “macro” as used herein refers to a range of about 10 μm to several 100 μm or more in terms of approximate numerical values. In the present invention, the portion 5 having a different second cross-sectional area corresponds to “a portion for exhibiting an anchoring effect with the resin existing on the joint surface between the metal and the resin”.

  As shown in FIG. 10, the cross-sectional shape of the portion 4 having the different first cross-sectional area is a quadrangle, but it has been disclosed so far whether the cross-sectional shape is an ellipse, a triangle, or other shapes. Obviously, this is true when the action of this part is taken into consideration.

  Similarly, in the portion 5 having a different second cross-sectional area in FIG. 10, the cross-sectional shape of the portion 4 having a different first cross-sectional area in FIG. However, it has a trapezoidal cross section, but it is obvious that the same holds true regardless of whether the cross sectional shape is an ellipse, a triangle or other shapes.

  FIG. 11 is an example in which the number of parts 4 of the insert part 2 differing in the first cross-sectional area is different from that of the thin-walled part 3, and the symbols and symbols in FIG. The disclosed part names and actions are the same.

  The example shown in FIG. 11 is an example in which two portions 4 and two thin portions 3 having different first cross-sectional areas are provided. If the number of each portion is one or more, the operation changes. This is the same as the example disclosed in FIG.

  The effect of the present invention was specifically verified using the shape example shown in FIG. As a result of the airtightness evaluation, in the state where only the insert part was inserted into the resin, the ratio that the airtightness could be secured was 30%, but the ratio that the airtightness could be secured by performing the high frequency induction heating process was 90%. % Improved. On the other hand, as a comparative example, using a metal insert part having a conventional structure that does not have a part that generates heat when receiving a high frequency induction wave and a part that suppresses heat conduction from the part that generates heat when receiving the high frequency induction wave. A similar high-frequency induction heating process was performed to evaluate the same airtightness. As a result, in the conventional metal insert part structure, the occurrence of microvoids was observed in the resin in contact with the metal insert part, and the ratio of ensuring airtightness was 35%. In the conventional structure, even if the conditions for high frequency induction heating are adjusted, it is difficult to melt the resin under the optimum conditions at the joint surface between the metal and the resin. It was thought that the airtightness could not be ensured because almost no effect of improving the air quality was obtained.

<Embodiment 4>
FIG. 12 is an extreme example in which the number of parts 4 of the insert part 2 different from the first cross-sectional area, the thin-walled portion 3 and the second cross-sectional area 5 are different. This is a case where the different parts 4 have the same cross-sectional shape as the thin-walled part 3. The metal insert part shown in FIG. 12 has basically the same configuration as the metal insert part shown in FIG. 8 except that it has a part for expressing the anchoring effect. Similarly to the action of high frequency induction heating, the outermost peripheral portion 2b of the outer edge receives heat by high frequency induction at the surface portion, while the heat transfer length required from the thermal resistance value is sufficiently secured in the thin portion 3, and A sufficient time can be secured for heating the outermost peripheral portion 2b of the outer edge by high frequency induction heating. Therefore, this configuration has the same effect as the metal insert part shown in FIG. 8 and further has a portion that exhibits a throwing effect, so that the airtightness can be further improved.

  Naturally, as shown in FIG. 13, it is obvious that the thin-walled portion 3 shown in a straight line shape in FIG.

<Embodiment 5>
14 and 15 show the simplest form that can be realized when various requirements for heating are satisfied. As shown in FIG. 14, the cross-sectional thickness of the insert part 2 and the cross-sectional thickness of the joint part 2b are the same, or the cross-section of the joint part 2b is larger than the cross-sectional thickness of the insert part 2 as shown in FIG. A configuration with a large thickness may be established depending on conditions.

  In said Embodiment 1-5, the metal insert component 2 is the resin which comprises the resin part 1 at least in the thin part 3, the site | part 4 from which a 1st cross-sectional area differs, and the part 5 from which a 2nd cross-sectional area differs. A surface treatment is applied to improve adhesion or adhesion. This surface treatment can be performed using various known existing techniques. For example, a TRI System (registered by Toa Denka Co., Ltd.) that forms an adhesive layer on the surface of a metal insert part using an adhesive containing a specific triazine compound and an organic compound capable of chemically reacting with the specific triazine compound. Trademark and address: Surface treatment can be performed by a surface treatment technique called Iwana 20-20), Shibumin, Tamayama-ku, Morioka City, Iwate Prefecture. This surface treatment technique is a means that forms a chemical film-forming layer that functions as the adhesive layer on the metal surface and chemically bonds the metal and the resin by a chemical change generated by heat and pressure during molding. It is. In addition to the above-described surface treatment method using a triazine compound, the present invention may employ a method of surface-treating a metal insert part using a silane-based, titanium-based, or aluminum-based coupling agent. When the joint part 2a of the insert part 2 is aluminum, surface roughening by anodic oxidation can also be applied as a surface treatment method. In addition, in the case where only the necessary surface treatment is performed, in addition to the method of applying the surface treatment agent to that portion, it is possible to adopt a method of exposing only the necessary portion to be surface treated and otherwise masking. I can do it.

  For the shape example shown in FIG. 9, an airtightness evaluation is performed after a high frequency induction heating process is performed between a metal insert part to which the surface treatment method using a triazine compound is applied and a metal insert part that is not surface-treated. It was. As a result, the ratio of the resin-molded product in which the air-tightness of the metal insert subjected to the surface treatment can be ensured is 90%, whereas the ratio of the metal insert part whose surface is not treated is 70%. In addition, when the high frequency induction heating process is not performed, the air-tightness of the metal insert part having an untreated surface is greatly reduced as the ratio of the resin mold product in which the air-tightness can be secured is 10% or less. As described above, according to the present invention, even when a metal insert part having an untreated surface is used, the hermeticity of the resin molded product can be improved by performing the high frequency induction heating step. By performing this surface treatment, the airtightness can be greatly improved.

  As described above, the present invention can be applied to a planar metal insert resin molded product in which a portion that generates heat by receiving a high frequency induction wave on the outermost periphery of the outer edge is provided along the shape of the metal insert part. The end portion of the metal tubular body is made of resin by providing a cylindrical portion with heat generated by receiving a high frequency induction wave on either the outer peripheral portion of the end portion of the metal tubular body or the inner peripheral portion of the end portion, or both outer peripheral portions thereof. The present invention can also be applied to a resin molded product having a structure inserted in the resin. Below, the example applied to the metal insert component of a tubular body is demonstrated.

<Embodiment 6>
FIG. 16 shows an example of a metal tubular body having a cylindrical shape with one end opened, and a metal insert part in which a portion that generates heat by receiving a high frequency induction wave is provided at the outer periphery of the end of the one end opening. Indicates. 16A shows a cross-sectional view when the metal tubular body 8 is inserted into the resin tubular body 9 and joined together, and FIG. 16B shows the metal tubular body 8 before the resin tubular body 9 is inserted. A perspective view is shown.

 As shown in FIG. 16, the metal insert component according to the present embodiment includes a part 4 that generates heat by receiving a high-frequency induced wave provided at an outer peripheral part of one end opening of the metal tubular body 8, and a part 4 that generates heat. The thin-walled portion 3 corresponding to the portion for suppressing the heat conduction is provided. The metal tubular body 8 and the resin tubular body 9 are joined as follows, for example. After the metal tubular body 8 is pushed into the resin tubular body 9, the portion 4 that generates heat by receiving the high-frequency induction wave using the high-frequency induction coil 6 is heated, so that the resin tubular body 9 that contacts the heat-generating portion 4 is heated. Part of the inner wall begins to melt. If necessary, in this state, the one end opening of the metal tubular body 8 is continuously pushed toward the bottom inner wall 10 of the resin tubular body, and when the resin tubular body 9 is pushed to a desired position, heating by the high frequency induction coil 4 is performed. Stop. By this operation, a resin melted portion is formed at the fastening portion between the metal tubular body 8 and the resin tubular body 9, and the metal tubular body 8 and the resin tubular body 9 can be joined.

  In the metal tubular body 8 shown in FIG. 16, since the heat conduction from the portion 4 that generates heat by receiving the high-frequency induced wave is suppressed due to the presence of the thin portion 3, the resin melted portion is pushed out to the opening of the resin tubular body 9. Instead, the portion 4 that generates heat upon receiving the high frequency induction wave is only formed at the portion that contacts the inner wall of the resin tubular body 9. Therefore, the airtightness between the metal tubular body 8 and the resin tubular body 9 can be ensured without reducing the density of the resin melted portion. Furthermore, the thin-walled portion 3 shown in FIG. 16 has a thinner cross section than the other portions of the metal tubular body 8, and stress relaxation against stress generated during joining and use of the metal tubular body 8 and the resin tubular body 9. It has a function. Therefore, a resin molded product having excellent bonding reliability can be formed using the metal insert component according to the present embodiment.

  FIG. 17 shows a metal insert part in which a portion that generates heat by receiving a high-frequency induction wave is provided on the inner periphery of the end of the one end opening as a modification of the metal insert part made of a metal tubular body. The metal tubular body 11 shown in FIG. 17 is different in configuration and function from the metal insert part shown in FIG. 16 in that the resin tubular body 12 is inserted inside thereof.

  In FIG. 17, in the inner peripheral portion of the end portion of the one end opening of the metal tubular body 11, the portion 4 that generates heat upon receiving a high frequency induction wave is a thin wall corresponding to a portion for suppressing heat conduction from the portion 4 to be invented. It is provided via part 3. The metal tubular body 11 and the resin tubular body 12 are joined as follows, for example. After the metal tubular body 11 is pushed into the resin tubular body 12 (or the resin tubular body 12 is pushed into the metal tubular body 11), the high-frequency induction coil 6 is used to receive the high-frequency induction wave and heat the portion 4 that generates heat, thereby A part of the outer wall of the resin tubular body 12 in contact with the portion 4 that generates heat is melted. By this operation, a resin melted portion is formed at the fastening portion between the metal tubular body 11 and the resin tubular body 12, and the metal tubular body 11 and the resin tubular body 12 can be joined.

  In the metal tubular body 11 shown in FIG. 17, since the heat conduction from the portion 4 that generates heat by receiving the high frequency induction wave is suppressed due to the presence of the thin-walled portion 3, the resin melted portion exceeds the opening of the resin tubular body 12. Without being pushed out, the portion 4 that generates heat upon receiving the high frequency induction wave is only formed at the portion that contacts the outer wall of the resin tubular body 12. Accordingly, as in the case of the resin insert part shown in FIG. 16, the density of the resin melted portion is not reduced, and the airtightness between the metal tubular body 11 and the resin tubular body 12 can be ensured.

  In FIG. 16 or FIG. 17, the site 4 that generates heat upon receiving a high frequency induction wave is formed on the outer periphery of the end of the metal tubular body 8 or the inner periphery of the end of the metal tubular body 11. You may provide in the both outer peripheral parts of the metal tubular bodies 8 and 11. FIG. In the case where the heat generating portion 4 is provided on both outer peripheral portions of the metal tubular bodies 8 and 11, not only the effect of the present invention of ensuring airtightness is exhibited, but also the cross-sectional area or volume of the heat generating portion 4 is increased, so that high frequency induction is performed. The heating efficiency by the coil 6 can be increased.

<Embodiment 7>
FIG. 18 shows, as an example of a metal insert part made of a metal tubular body, by forming a notch at one end of the metal tubular body, thereby generating heat by receiving a high frequency induction wave and heat conduction from the heat generating part. The metal insert component which isolate | separated and formed the site | part to suppress is shown. 18A is a cross-sectional view when the metal tubular body 13 is pushed into the resin tubular body 14 simultaneously with heating, and FIG. 18B is a cross-sectional view showing a state after the resin is melted.

  In FIG. 18, the metal tubular body 13 is provided with a cut portion 15 near the end opening. Since the cut portion 15 has an effect of reducing the cross-sectional area of the metal tubular body 13, the cut portion 15 has substantially the same function as a portion that suppresses heat conduction from the portion invented upon receiving the high frequency at the end. Further, the metal separation end portion 16 formed by being partially separated from the metal tubular body 13 by the cut portion 15 corresponds to a portion that generates heat by receiving a high frequency induction wave using the high frequency induction coil 6.

  In the present embodiment, the metal tubular body 13 and the resin tubular body 14 are joined as follows, for example. As shown in FIG. 18A, the high frequency induction coil 6 is installed near the bottom of the resin tubular body 14, and the metal tubular body 13 is pushed into the resin tubular body 14 simultaneously with the heating by the high frequency induction coil 6. Next, as shown in FIG. 18B, when the metal tubular body 13 reaches near the bottom of the resin tubular body 14, the metal separation end 16 divided by the cut is heated by the high frequency induction coil 6. The side inner wall part of the resin tubular body 14 and the bottom inner wall 17 are melted to form a resin penetration portion, and the metal tubular body 13 and the resin tubular body 14 are joined to each other at the bottom inner wall of the resin tubular body 14. Can do. Here, the metal separation end portion 16 is formed so as to protrude from the most distal end portion of the opening in the circumferential direction of the metal tubular body 13, and is within the range of the length of the metal separation end portion 16 in which the resin melted portion 18 is divided. Thus, the resin tubular body 14 is uniformly formed on the bottom circumference. In addition, since the heat conduction from the metal separation end portion 16 corresponding to the portion that generates heat by receiving the high frequency induction wave is suppressed due to the presence of the cut portion 15, the resin melted portion 18 is pushed out upward of the resin tubular body 13. Instead, the metal separation end 16 is formed only at a portion in contact with a part of the side inner wall and the bottom inner wall 17 of the resin tubular body 13. Therefore, the metal tubular body 13 and the resin tubular body 14 are firmly joined without causing a decrease in the density of the resin melted portion, and the airtightness between the two can be sufficiently ensured.

  Further, since the metal separation end 16 shown in FIG. 18 is formed with a thin wall, it has a stress relaxation function against stress generated during joining and use of the metal tubular body 13 and the resin tubular body 14. Therefore, by using the metal insert component according to the present embodiment, a resin molded product having excellent bonding reliability can be formed.

  FIG. 18 shows an example in which the cut portion 15 is provided on the outer wall of the metal tubular body 14. However, when another resin tubular body is inserted into the metal tubular body as in the case shown in FIG. 17, the cut portion 15 is cut. The portion 15 may be provided on the inner wall of the metal tubular body 16. As in the example shown in FIG. 18, the resin molded product molded using the metal tubular body having the structure can obtain the effects of ensuring airtightness and improving the reliability of the joined portion. Further, in the present embodiment, instead of providing the cut portion 15 on the outer wall or the inner wall of the metal tubular body as a portion having the same function as the portion that suppresses heat conduction from the portion to be invented by receiving a substantially high frequency. A groove or a recess may be formed.

<Eighth embodiment>
FIG. 19 shows, as another example of the metal insert part, a metal tubular body in which an end cross section of a portion that generates heat by receiving a high frequency induction wave is divided into two or more. 19A is a cross-sectional view when the metal tubular body 19 is pressed into the resin tubular body 20 simultaneously with heating, and FIG. 19B is a cross-sectional view showing a state after the resin is melted.

In the metal insert part shown in FIG. 19, a thin part corresponding to a part having the same function as a part for suppressing heat conduction is not formed near the end opening of the metal tubular body. The thin metal portion 21 including the divided thin metal portions 21a and 21b has the thinnest cross-sectional thickness at the tip of the portion that generates heat upon receiving a high frequency induction wave, and is divided into a metal tubular body at the divided root portion. And have a cross-sectional thickness that is approximately the same or slightly larger. Therefore, in the present embodiment, heating by the high-frequency induction coil 6 at the outermost peripheral portion 2b of the outer edge of the portion that generates heat by receiving the high-frequency induction wave based on the same concept as the example of the metal insert part shown in FIG. On the other hand, it is necessary to define the length of the thin metal portion 21a so that the heat transfer length required from the thermal resistance value is sufficiently secured in the divided thin metal portion 21a. That is, the length (L ₂₎ of the thin metal portion 21a corresponding to the portion for suppressing the heat conduction is suppressed in order to suppress the heat conduction so that the time for heating the outermost peripheral portion 2b of the outer edge is sufficiently secured by the high frequency induction heating. ). The heat transferability in the thin metal portion 21a is determined not only by the length (L ₂ ) of the thin metal portion 21a, but also by the cross-sectional thickness (t ₂ ) of the tip portion of the thinnest metal separation portion 21a in the portion that suppresses heat conduction. Therefore, the effect of the present invention can be achieved by setting the ratio (L ₂ / t ₂ ) in the direction of increasing the ratio. Since the portion having the thinnest cross-sectional thickness is rate-determining for thermal conductivity, the thickness (t ₂ ) of the tip portion having the thinnest cross-sectional thickness in the metal thin-walled portion 21a is focused on. It is practical to define the ratio with the length (L ₂ ).

The basic concept for determining the ratio of the length (L ₂ ) to the cross-sectional thickness (t ₂ ) of the tip portion of the thin metal portion 21a is basically the same as the schematic diagram shown in FIG. In the present embodiment as well, as a result of examining in detail the relationship between the ratio (L ₂ / t ₂ ) between the _two and the heat transferability of the thin metal portion 21a corresponding to the portion where heat conduction is suppressed, L ₂ / It was found that the effect of the present invention is exhibited when t ₂ ≧ 3. When L ₂ / t ₂ is less than 3, the heat conduction from the outermost peripheral portion 2b of the outer edge of the portion that generates heat upon receiving a high frequency induction wave increases, and melts up to the upper portion of the metal tubular body 19, that is, the divided root portion. Resin scooping was observed. In addition, the present invention reduces the cross-sectional thickness (t ₂ ) of the tip portion of the metal separation portion 21a in order to suppress the heat from the portion that generates heat upon receiving the high frequency induction wave from being transmitted to the metal insert part of the tubular body. It is necessary to make it thinner than the cross-sectional thickness (T ₂ ) of the metal tubular body as a part for suppressing heat conduction.

Therefore, when the metal insert component of the present embodiment has the structure shown in FIG. 19, it is necessary to satisfy the following formulas (3) and (4).

In the present embodiment, it is possible to define L ₂ / t ₂ for the thin metal portion 21a located closer to the high frequency induction coil in the end cross section divided into two at the site that generates heat upon receiving the high frequency induction wave. is necessary. FIG. 19 shows an example in which the thin metal portion 21a located closer to the high-frequency induction coil has a thickness thinner than that of the other thin metal portion 21b. By satisfying the relational expressions (3) and (4), the effects of the present invention can be achieved. Both of the divided thin metal portions 21a and 21b basically satisfy the above relationships (3) and (4) in order to achieve the effects of the present invention, but are at least closer to the high frequency induction coil. The thin metal portion 21a needs to satisfy the relationships (3) and (4).

  In the present embodiment, the metal tubular body 19 and the resin tubular body 20 are joined as follows, for example. As shown in FIG. 19A, the high frequency induction coil 6 is installed near the bottom of the resin tubular body 20, and the metal tubular body 19 is pushed into the resin tubular body 20 simultaneously with the heating by the high frequency induction coil 6. Next, as shown in FIG. 19 (b), when the metal tubular body 19 reaches near the bottom of the resin tubular body 20, the outermost peripheral portion 2b of the outer periphery of the separated thin metal portion 21 (receives a high frequency induction wave). The portion corresponding to the portion that generates heat) begins to be heated by the high-frequency induction coil 6, so that a part of the side inner wall and the bottom inner wall 22 of the resin tubular body 20 are melted to form a resin melted portion 23a. The body 19 and the resin tubular body 20 can be joined at the bottom inner wall 22 of the resin tubular body 20. Here, the thin metal portion 21 a is formed in the same plane in the circumferential direction of the metal tubular body 19, and the resin melted portion 23 a is aligned with the bottom circumferential shape of the resin tubular body 20 at the end of the thin metal portion 21 a. Are formed.

Further, the other end portion of the thin metal portion 21b formed by the division is also heated by using the high frequency induction coil 6, and the bottom inner wall 22 of the resin tubular body 20 is melted, whereby the resin melted portion 23b. Is uniformly formed in the shape of the circumference of the bottom inner wall of the resin tubular body 20 at the end of the thin metal portion 21b. In addition, the ratio of the length of the thin metal portion to the cross-sectional thickness (L ₂ / t ₂ ) is large, and the outermost peripheral portions 2b of the thin metal portions 21a and 21b corresponding to the portions that generate heat upon receiving the high frequency induction wave Therefore, the resin melted portions 23a and 23b are not pushed out in the upper direction of the resin tubular body 13, and the tip portions of the thin metal portions 21a and 21b and the bottom inner wall 22 of the resin tubular body 19 are not pushed out. It is formed only at the contact portion and its vicinity. Accordingly, the metal tubular body 19 and the resin tubular body 20 are firmly joined without causing a decrease in the density of the resin melted portion, and the airtightness between the two can be sufficiently ensured.

  Furthermore, since the metal foil meat portions 21a and 21b shown in FIG. 19 have a stress relaxation function with respect to the stress generated at the time of joining and using the metal tubular body 19 and the resin tubular body 20, the metal according to the present embodiment. By using the insert parts, a resin molded product having excellent bonding reliability can be formed. Further, in the joining method shown in FIG. 19, since gas tends to be accumulated inside the metal tubular body 19 when the resin is melted, a minute through hole or through groove for releasing the gas is formed in any one of the thin metal portions 21b. By providing at a place, the joint strength can be significantly improved.

  20 uses a metal tubular body 19 having the same shape as the metal insert part shown in FIG. 19, pushes a resin tubular body 24 into the metal tubular body 19, and tips the thin metal portions 21 a and 21 b by the high frequency induction coil 6. It is a figure which shows the method to join a part to the flat plate 25 provided in the outer periphery of the resin tubular body 24. FIG. 20A is a cross-sectional view when the metal tubular body 19 is pushed into the resin tubular body 24 simultaneously with heating, and FIG. 20B is a cross-sectional view showing a state after the resin is melted.

  The joining method shown in FIG. 20 is basically the same as that shown in FIG. 19 except that the structure of the resin tubular body 24 that joins the metal tubular body 19 is different. That is, the thin metal portion 21a is formed in the circumferential direction of the end opening of the metal tubular body 19 by division, and the resin melted portion 23a is provided on the outer periphery of the resin tubular body 24 at the end of the thin metal portion 21a. The flat plate 25 is uniformly formed in a circumferential shape. Further, with respect to another thin metal portion 21b formed by division, the end portion is heated by the high frequency induction coil 6 to melt the base portion 25 provided on the outer periphery of the resin tubular body 24, so that the resin melts. The portion 23b is uniformly formed on the flat plate 25 provided on the outer periphery of the resin tubular body 24 at the end of the thin metal portion 21b.

  In FIG. 20, the thin metal portions 21a and 21b function as an airtight securing portion and a fixing portion, respectively. Further, since the thin metal portion 21a is formed with a thin wall, an effect that stress generated in the joint portion is relaxed can be obtained. Therefore, the resin molded product obtained by the molding method shown in FIG. 20 not only ensures airtightness, but also has excellent reliability, as in FIG.

  19 and 20 show an example in which the end cross section of the portion that generates heat by receiving the high frequency induction wave in the metal tubular body 19 is divided into two, but in this embodiment, it may be divided into three or more. . In addition, a groove or a recess can be formed instead of dividing an end cross section of a portion that generates heat by receiving a high frequency induction wave by cutting. FIG. 21 shows an example of a metal insert component in which a groove is provided in an end cross section of a portion that generates heat upon receiving a high frequency induction wave.

  FIG. 21 is formed by using the resin tubular body 24 having the same shape as that shown in FIG. 20, pushing the resin tubular body 24 into the metal tubular body 26, and forming the groove 27 using the high frequency induction coil 6. It is a figure which shows the method to join the front-end | tip part of the thin metal parts 28a and 28b to the flat plate 25 provided in the outer periphery of the resin tubular body 24. FIG. 21A is a cross-sectional view when the metal tubular body 26 is pressed into the resin tubular body 24 simultaneously with heating, and FIG. 21B is a cross-sectional view showing a state after the resin is melted. Here, in the thin metal portions 28a and 28b, at least 28a needs to satisfy the relational expressions (3) and (4).

  The joining method shown in FIG. 21 is basically the same as that shown in FIG. 20 except that the resin tubular body 24 is different in the structure of the end cross section of the portion that generates heat upon receiving a high frequency induction wave. That is, as shown in FIG. 21B, the metal thin portion 28a is formed in the circumferential direction of the metal tubular body 26, and the resin melted portion 29a is at the end of the metal thin portion 28a. It is uniformly formed in a circular shape on a flat plate 25 provided on the outer periphery. In addition, another thin metal portion 28b formed by the formation of the groove 27 is also heated by the high frequency induction coil 6 to melt the flat plate 25 provided on the outer periphery of the resin tubular body 24. The melted portion 29b is uniformly formed on the base portion 25 provided on the outer periphery of the resin tubular body 24 at the end of the thin metal portion 28b.

  Therefore, the resin molded product obtained by the molding method shown in FIG. 21 not only ensures airtightness, but also has excellent reliability, as in FIG. Further, in the case of the joining method shown in FIG. 21, as in the joining method shown in FIGS. 19 and 20, the gas tends to accumulate inside the metal tubular body 26 when the resin is melted. By providing the through hole or the through groove at any location of the thin metal portion 28b, the bonding strength can be greatly improved.

<Embodiment 9>
The metal insert part of the tubular body shown in FIGS. 19 to 21 needs to satisfy the relational expressions (3) and (4) in order to achieve the effects of the present invention. However, as a metal insert component, for example, in the metal tubular body having the structure shown in FIGS. 22A and 22B, the end cross section of the portion that generates heat by receiving the high frequency induction wave is shown in FIGS. 19 to 21. Although it has the same structure as the metal tubular body, the effects of the present invention can be achieved without satisfying the relational expressions (3) and (4). In FIG. 22, (a) shows a metal tubular body 19 in which an end cross section of a portion that generates heat upon receiving a high-frequency induced wave is divided into two, and (b) shows that two thin metal portions are formed by forming a groove. The metal tubular body 26 is shown.

  The metal tubular body shown in FIGS. 22A and 22B has a thin portion 3 that has a smaller cross-sectional area than a portion that generates heat upon receiving a high-frequency induced wave. Heat conduction from a portion that generates heat upon receiving waves can be suppressed. For this reason, it is possible to prevent the melted portion of the resin due to the high frequency induction wave from being pushed out of the joint surface, and it is possible to easily control the formation of the melted portion. Thereby, the adhesiveness or adhesiveness of a joint part can be improved and the airtightness of a resin molded product can be improved significantly.

  The metal insert metal which consists of a metal tubular body shown in FIGS. 15-22 demonstrated in the said Embodiments 6-9 corresponds to the junction part with resin at least like the case of the said Embodiment 1-4. By subjecting the part to surface treatment, adhesion or adhesion to the resin can be improved. This surface treatment can be performed using various known existing techniques as in the first to fourth embodiments.

  As described above, the metal insert part of the present invention can be improved in the airtightness of the resin molded product by increasing the adhesion or adhesiveness of the joint surface with the resin by performing the high frequency induction heating process. In addition, the metal insert part of the present invention is optimal in the structure, shape, installation location, etc. of the part for suppressing heat conduction from the part that generates heat by receiving the high frequency induction wave and the part that generates heat by receiving the external high frequency induction wave. By changing and changing, application to various insert resin molded products having various structures and uses can be expanded. As a result, various insert-molded products that can be applied not only to general household appliances but also to applications that require high reliability such as automobiles and industrial equipment can be manufactured, and thus the effectiveness thereof is extremely high.

1 Resin part 2 Insert part 2a Joint part 2b Outermost outermost peripheral part 2c Exposed end 3 Thin-walled part 4 Part having different first cross-sectional area (part generating heat upon receiving high frequency induction wave)
5 Parts with different second cross-sectional areas (sites that develop anchor effect)
6 High-frequency induction coil 7 High-frequency oscillator 8, 11, 13, 19, 26 Metal tubular body 9, 12, 14, 20, 24 Resin tubular body 10 Bottom inner wall 15 of resin tubular body 16 Notch 16 Metal separation end 17, 22 Inner walls 18, 23, 29 of the resin tubular body Resin melted portions 21, 28 Metal thin portion 25 Flat plate 27 groove provided on the outer periphery of the resin tubular body

Claims (14)

A method for producing a resin molded product having a metal insert part and a resin,
The resin molded product includes a portion covered with the resin on at least a part of an outer edge of the metal insert part, and a metal exposed part of the metal insert part not covered with the resin,
At least a part of the outer edge of the metal insert part has a portion that generates heat when receiving a high-frequency induced wave as a portion for suppressing heat conduction from the portion that generates heat when receiving the high-frequency induced wave. Is provided on the outermost periphery of the outer edge of the metal insert part through a part formed so that the cross-sectional area becomes smaller than the part that generates heat.
Using the metal insert part, a step of resin molding by injection molding, compression molding or transfer molding,
A resin comprising a step of performing induction heating by providing a high-frequency induction device at a location where the resin existing on the joint surface between the metal and the resin is melted in at least a part of the outer edge of the metal insert component, and a cooling step Manufacturing method of molded products.   The part for suppressing heat conduction from the part that generates heat upon receiving the high frequency induction wave suppresses the heat conduction when the exposed metal part of the metal insert part is extended toward the outer edge of the metal insert part. The method for producing a resin molded product according to claim 1, wherein the method has a cross-sectional area smaller than a cross-section of a portion in contact with a portion for the purpose.   The part for suppressing heat conduction from the part that generates heat by receiving the high-frequency induced wave includes at least one of a groove, a hole, and a hole so that a cross-sectional area is smaller than the part that generates heat by receiving the high-frequency induced wave. The method for producing a resin molded product according to claim 2, wherein a metal insert part on which one of them is formed is used.   The portion that generates heat upon receiving the high-frequency induced wave and the portion for suppressing heat conduction from the portion that generates heat upon receiving the high-frequency induced wave are metal inserts having a combination of a circular shape, an elliptical shape, and a rectangular cross-sectional shape. The method for producing a resin molded product according to any one of claims 1 to 3, wherein a component is used.   A metal insert having a circular or elliptical cross-sectional shape that generates heat upon receiving the high-frequency induced wave, and a rectangular cross-section that suppresses heat conduction from the high-frequency induced wave receiving heat. The method for producing a resin molded product according to claim 4, wherein a part is used. A method for producing a resin molded product having a metal insert part and a resin,
The resin molded product includes a portion covered with the resin on at least a part of an outer edge of the metal insert part, and a metal exposed part of the metal insert part not covered with the resin,
At least a part of the outer edge of the metal insert part has at least a part that generates heat when receiving a high-frequency induced wave as a part for suppressing heat conduction from the part that generates heat when receiving the high-frequency induced wave. Through the part made of a material having a larger thermal resistance than the part that generates heat by receiving the high-frequency induction wave, provided on the outermost periphery of the outer edge of the metal insert part,
Using the metal insert part, a step of resin molding by injection molding, compression molding or transfer molding,
A resin comprising a step of performing induction heating by providing a high-frequency induction device at a location where the resin existing on the joint surface between the metal and the resin is melted in at least a part of the outer edge of the metal insert component, and a cooling step Manufacturing method of molded products.   A metal insert component in which the material having a higher thermal resistance than the portion that generates heat upon receiving the high-frequency induced wave is at least one of a metal, a resin, and a ceramic that have lower thermal conductivity than the portion that generates heat upon receiving the high-frequency induced wave The method for producing a resin molded product according to claim 6, wherein: A method for producing a resin molded product having a metal insert part and a resin,
The resin molded product includes a portion covered with the resin on at least a part of an outer edge of the metal insert part, and a metal exposed part of the metal insert part not covered with the resin,
At least a part of the outer edge of the metal insert part has a portion that generates heat when receiving a high-frequency induced wave as a portion for suppressing heat conduction from the portion that generates heat when receiving the high-frequency induced wave. The cross-sectional thickness, the length of the part for suppressing the heat conduction, and the exposed metal part of the metal insert part at the outer edge of the metal insert part. when extending toward the cross-sectional thickness of the part abutting portion for suppressing the heat conducting, when the t _1, L _1, and T _1, respectively, the t _1, L _1, and T ₁ Is provided on the outermost periphery of the outer edge of the metal insert part through a portion formed so as to satisfy the following formulas (1) and (2):
T ₁ > t ₁ (1)
L ₁ / t ₁ ≧ 3 (2)
Using the metal insert part, a step of resin molding by injection molding, compression molding or transfer molding,
A resin comprising a step of performing induction heating by providing a high-frequency induction device at a location where the resin existing on the joint surface between the metal and the resin is melted in at least a part of the outer edge of the metal insert component, and a cooling step Manufacturing method of molded products.   The part for suppressing heat conduction from the part that generates heat by receiving the high-frequency induced wave includes at least one of a groove, a hole, and a hole so that a cross-sectional area is smaller than the part that generates heat by receiving the high-frequency induced wave. 9. The method for producing a resin molded product according to claim 8, wherein a metal insert part on which one of them is formed is used.   At least a part of the outer edge of the metal insert part is covered with a part that generates heat upon receiving a high-frequency induced wave, a part for suppressing heat conduction from a part that generates heat upon receiving the high-frequency induced wave, and the resin. The metal insert has a portion for exhibiting an anchoring effect between the metal and the resin existing on the joint surface by forming a cross-sectional area larger than that of the exposed metal portion of the metal insert part. The method for producing a resin molded product according to any one of claims 1 to 9, wherein a metal insert part is used, which is provided in this order from the outermost periphery of the outer edge of the part.   2. A metal insert component provided on one of the outer peripheral portion and the inner peripheral portion of the end portion of the metal tubular body, or a metal insert component provided on both outer peripheral portions thereof is used as the portion that generates heat upon receiving the high-frequency induction wave. The manufacturing method of the resin molded product in any one of -5.   4. The metal insert part according to claim 1, wherein the metal insert part is a metal tubular body, and uses a metal insert part in which an end cross section of a portion that generates heat upon receiving the high frequency induction wave is divided into two or more. The manufacturing method of the resin molded product in any one. An end cross section of a portion that generates heat upon receiving the high-frequency induced wave is divided into two or more by a cut or a groove, and the one divided portion is heat conduction from a portion that generates heat upon receiving the high-frequency induced wave. Including a portion for suppressing heat conduction, and a cross-sectional thickness of a tip portion of the one divided portion, a length of a portion for suppressing heat conduction by receiving the high-frequency induced wave, and before the division metal cross-sectional thickness of the metal insert part, when a _t 2, _{L 2,} and _{T 2,} respectively, wherein _t 2, _{L 2,} and _{the T 2} satisfies the expression (3) and (4) below The method for producing a resin molded product according to claim 12, wherein an insert part is used.
T ₂ > t ₂ (3)
L ₂ / t ₂ ≧ 3 (4)   The method for producing a resin molded product according to any one of claims 1 to 13, wherein the metal insert part is subjected to a surface treatment for promoting a bonding with a resin material on a surface thereof.

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