JP7130585B2 - Extrusion mold - Google Patents

Description

TECHNICAL FIELD The present invention relates to an extrusion mold used when extruding a long molded product.

2. Description of the Related Art Conventionally, as a long molded article made of resin, one that is formed as an extrusion molded article by extruding a resin using an extrusion molding die is known. In long extrusions made of extruded resin, for example, cutting after molding, such as profile extrusions having various cross-sectional shapes such as T-shaped or U-shaped In some cases, it is difficult to arrange predetermined dimensions and appearance properties by post-processing such as. In this case, in order to ensure the dimensional accuracy and appearance quality of the molded extruded product, extrusion resistance is adjusted, which changes with shrinkage during cooling and solidification during molding, and extrusion speed is adjusted. There is a method of retaining pressure so that the pressure applied to the resin increases in the area where the surface of the resin in the molding die is solidified.

For example, an extrusion mold disclosed in Patent Document 1 includes an upper mold and a lower mold that are clamped together by clamping bolts. This extrusion molding die has a heating region on the upstream side and a cooling region on the downstream side in the resin passage through which the resin material extruded by the extruder passes. Furthermore, in this extrusion molding die, a gap is formed between the upper mold and the lower mold, and in the cooling area, the passage cross section can be made smaller by narrowing the gap between the upper mold and the lower mold by the pressing part. It is configured.

In addition, the extrusion molding die disclosed in Patent Document 2 includes a surface pressure adjusting bolt that adjusts the surface pressure of the upper and lower dies clamped together by a clamping bolt. , the resin passage through which the resin material extruded by the extruder passes has a heating area on the upstream side and a cooling area on the downstream side. This extrusion molding die has a pressing portion that directly presses the elongated resin member passing through the portion on the resin passage outlet side formed at the downstream end of the resin passage in a direction perpendicular to the advancing direction. I have.

JP 2017-13285 A Japanese Unexamined Patent Application Publication No. 2017-13501

However, in the extrusion molding die described in Patent Document 1, for example, the holding pressure of the elongated resin member is adjusted by the balance of temperatures such as the extrusion temperature, the die temperature, and the cooling temperature. Therefore, if it is attempted to increase the frictional force applied to the elongated resin member by adjusting these conditions, it is difficult to control it. Also, when a plurality of elongated resin members are extruded at the same time to form a mold, the speed at which each of the plurality of elongated resin members is extruded tends to vary, and it is difficult to control this.

In the extrusion molding die described in Patent Document 2, since the long resin member can be directly pressed and held, the friction applied to the long resin member can be reduced without being affected by the adjustment of the temperature balance. power can be adjusted. Further, even when a plurality of elongated resin members are extruded and molded at the same time, each elongated resin member can be extruded by adjusting the pressing force of the pressing portion that directly presses the elongated resin members. You can control the speed. However, in order to press the long resin member, in addition to the mold clamping bolt, the surface pressure adjusting bolt, and the cooling water pipe for cooling the mold near the exit of the resin passage, an independent long It is necessary to dispose a pressing portion for pressing the scale-shaped resin member. At this time, it is difficult to provide a pressing portion having a sufficient pressing area with the elongated resin member, and since the contact area with the elongated resin member becomes small, the surface pressure increases. Then, when the elongated resin member is pressed by such a pressing portion, there is a problem that a trace of the pressing may remain on the elongated resin member.

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems, and an object of the present invention is to be able to adjust the pressure applied to a long resin member molded by extrusion molding, and to simultaneously press a plurality of long resin members. To provide an extrusion molding die capable of easily adjusting the extrusion speed even in the case of molding, and capable of forming a long resin member with excellent appearance properties.

(1) In order to solve the above problems, an extrusion mold according to an aspect of the present invention is a long mold that is filled with a resin material from one side by an extruder and extruded through a heating and cooling process. A main mold for discharging a shaped resin member from the other side and a pressurizing mold through-hole through which the elongated resin member attached to the main mold and discharged from the main mold is inserted are provided. a pressurizing mold, wherein the main mold includes an upper mold and a lower mold that are clamped together; a resin passage formed between the upper mold and the lower mold so that a resin material passes through; a resin passage outlet formed on the downstream side of the resin passage, wherein the pressurizing die includes the pressurizing die through hole arranged on an extension line of the resin passage outlet of the main body die; and a pressing portion that presses the elongated resin member in a direction intersecting with the advancing direction of the elongated resin member in order to pressurize the elongated resin member passing through the pressurizing die through hole. A mold for extrusion molding, characterized by comprising:

In a conventional extrusion molding die, for example, a die having a clamping bolt, a surface pressure adjusting bolt, and a cooling water pipe is further provided with a pressing portion to press the elongated resin member. However, according to the extrusion molding die configured as described above, the elongated resin member is ejected from the main mold through which the filled resin material is heated and cooled and the extruded elongated resin member is discharged. A pressurizing die provided with a pressurizing die through-hole to be inserted is attached in a state in which the pressurizing die through-hole is arranged on an extension line of the resin passage outlet of the main die. The pressing mold is provided with a pressing portion that presses and presses the elongated resin member in a direction that intersects with the advancing direction thereof. For this reason, the main mold is provided with a mold clamping bolt, a surface pressure adjusting bolt, and a cooling water pipe, and the long resin member is pressed against a pressure mold externally attached to the main mold. A pressing portion for pressing can be provided. As a result, the pressing part is not provided in the main mold, but is provided in the pressing mold that is externally attached to the main mold. The pressing portion can be of a size that does not increase the surface pressure on the resin member. Also, it becomes easy to change the shape of the pressing portion according to the shape of the elongated resin member. Further, since the pressurizing mold is provided with a pressing portion, the pressure applied to the elongated resin member molded by extrusion can be adjusted by changing the pressing force of the pressing portion against the elongated resin member. be able to. In addition, even when a plurality of elongated resin members are molded at the same time, by adjusting the pressing force of the pressing portion that presses the elongated resin members passing through the pressurizing die through-hole, the elongated resin member can be molded at the same time. The extrusion speed can be controlled so as to suppress variations in the extrusion speed of the resin member. Therefore, even when a plurality of long resin members are molded at the same time, the speed at which the long resin members are extruded can be easily adjusted by the pressing portion of the pressure mold.

Therefore, according to this configuration, it is possible to adjust the pressure applied to the elongated resin member molded by extrusion molding, and to easily adjust the extrusion speed even when a plurality of elongated resin members are simultaneously molded. At the same time, it is possible to provide an extrusion molding die capable of forming a long resin member with excellent appearance properties.

(2) Preferably, the pressing portion includes a contact member arranged in the pressurizing die through hole and in contact with the elongated resin member, and a pressing member that presses the contact member toward the elongated resin member. and a shaft, wherein the contact area of the contact member with the elongated resin member is larger than the area of the tip surface of the pressing shaft.

In this configuration, the elongated resin member is pressed by the contact member having a larger area than the tip surface of the pressing shaft. As a result, the pressure with which the pressing portion presses the long resin member is reduced, so that the pressed long resin member is less likely to undergo plastic deformation. As a result, traces are less likely to remain on the long resin member, and a long resin member with excellent appearance can be molded.

(3) Preferably, the contact member has a contact surface formed with a width longer than the maximum width of the elongated resin member on the side that contacts the elongated resin member.

In this configuration, the elongated resin member is pressed by the contact surface formed with a width longer than the maximum width of the elongated resin member. As a result, it is possible to suppress the occurrence of traces formed on the inner side of the elongated resin member in the width direction by the pressing portion, and it is possible to mold the elongated resin member having excellent external appearance properties.

(4) Preferably, the contact member has a contact surface whose length in the longitudinal direction is at least longer than the maximum width of the long resin member on the side that contacts the long resin member. have.

In this configuration, the elongated resin member is pressed by the contact surface whose length in the longitudinal direction is longer than the maximum width of the elongated resin member. As a result, traces formed in the longitudinal direction of the elongated resin member by the pressing portion are further suppressed, and the elongated resin member having excellent external appearance can be molded. It should be noted that the contact member may have a form in which the longitudinal length of the contact surface of the contact member is set to extend from the entrance to the exit of the pressurizing die through-hole.

(5) Preferably, the pressing shaft has a tip portion with an enlarged diameter at the tip portion, and the contact member has a groove portion extending parallel to the pressure die through-hole, and the groove portion is In a cross section perpendicular to the extending direction of the pressurizing die through-hole, the bottom side is widened with respect to the opening side so that the tip enlarged diameter portion is slidably fitted therein.

In this configuration, the pressing shaft has a tip enlarged diameter portion at the tip portion, and the contact member has a groove formed so that the tip enlarged diameter portion is slidably fitted therein. Thereby, the contact member is slidably held with respect to the pressing shaft. Further, in this configuration, the contact member has a groove portion extending parallel to the pressurizing die through hole, and the pressing portion corresponds to the groove portion formed by widening the bottom side with respect to the opening side. It has a widened tip for fitting. As a result, the contact member is slidably held with respect to the pressing shaft in a state in which it is locked and held by the tip enlarged diameter portion. Therefore, the contact member can be easily held with respect to the pressing shaft in the pressurizing die through-hole. Further, when the contact member fitted in the pressurization die through-hole is removed from the pressurization die, the contact member is suspended in the pressurization die through-hole by the pressing shaft. state. In this state, the contact member can be slid in a direction parallel to the direction in which the pressurizing die through hole extends, and the contact member fitted in the pressurizing die through hole can be easily removed from the pressing shaft. Therefore, according to the above configuration, the contact member can be easily held with respect to the pressing shaft in the pressurizing die through-hole, and the work of removing the contacting member from the pressurizing die can be easily performed. .

(6) Preferably, the pressing shaft is provided separately from a first shaft portion that is positioned in the pressing mold, and is coaxial with the first shaft portion. a second shaft portion arranged in series along a direction and in contact with the contact member; and a spring portion that biases the second shaft portion toward.

In this configuration, the pressing shaft that presses the contact member includes the first shaft portion and the second shaft portion that are connected via the spring portion. Then, the contact member presses the elongated resin member by urging the second shaft portion from the first shaft portion positioned in the pressing mold toward the contact member by the spring portion. Therefore, in the above configuration, the pressing portion can press the elongated resin member via the spring portion. Therefore, even if the amount of contraction changes in the elongated resin member ejected from the main mold and the dimensional variation occurs, the spring portion of the pressing shaft causes the dimensional variation in the pressurizing mold. can be absorbed and the pressure can be autonomously adjusted so that fluctuations in the pressure applied to the elongated resin member are reduced. As a result, even when the length of the resin member ejected from the main mold fluctuates, the fluctuation of the pressure applied to the long resin member in the pressing mold is greatly reduced, Extrusion resistance and extrusion speed can be adjusted autonomously. In addition, when a plurality of elongated resin members are molded at the same time, it is possible to more efficiently suppress the occurrence of variations in extrusion speed.

According to the present invention, it is possible to adjust the pressure applied to a long resin member molded by extrusion molding, and to easily adjust the extrusion speed even when simultaneously molding a plurality of long resin members. It is possible to provide an extrusion mold capable of forming a long resin member with a good appearance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view of an extruder, an extrusion molding die according to an embodiment of the present invention, and a long resin member molded by these. It is a perspective view including a partial cross section which shows an example of an elongate resin member. FIG. 2 is a cross-sectional view of the extrusion mold shown in FIG. 1; 2 is a plan view of a main mold in the extrusion mold shown in FIG. 1. FIG. 5 is a bottom view of the main mold shown in FIG. 4; FIG. FIG. 2 is a perspective view of part of the extrusion molding die shown in FIG. 1 as viewed from below; FIG. 4 is a cross-sectional view of the extrusion molding die shown in FIG. 3 taken along the line AA. 8 is a partially enlarged cross-sectional view of the extrusion molding die shown in FIG. 7; FIG. FIG. 5 is a cross-sectional view of an extrusion mold according to a modification of the present invention; FIG. 10 is a cross-sectional view of the extrusion molding die shown in FIG. 9 taken along the line BB. FIG. 10 is a view for explaining the operation of the extrusion molding die shown in FIG. 9;

EMBODIMENT OF THE INVENTION Hereinafter, it demonstrates, referring drawings for the form for implementing this invention.

In each figure described below, for convenience of explanation, the direction indicated by the arrow indicated as "front" is referred to as the front or front side, and the direction indicated by the arrow indicated as "rear" is referred to as the rear or rear side. , the direction indicated by the arrow marked right is called rightward, the direction indicated by the arrow marked left is called leftward, and the direction indicated by the arrow marked up is called upward or upward. , and the direction indicated by the downward arrow is referred to as downward or downward. Note that the left-right direction indicated by the arrow is referred to as the width direction.

[overall structure]
FIG. 1 is a schematic side view of an extruder 50, an extrusion molding die 1 according to an embodiment of the present invention, and a long resin member L molded by these. The extrusion molding die 1 according to the present embodiment is for extrusion molding a so-called profile extrusion molded product. In the extrusion mold 1, the pellet-shaped resin material M sequentially extruded by the piston 51 of the extruder 50, also called a ram, is heated in the plasticizing cylinder 52 of the extruder 50 and the heating region HZ of the extrusion mold 1. It passes through the resin passage 3 formed in the extrusion molding die 1 while being heated and melted in the . The molten resin material M passing through the resin passage 3 is cooled and solidified in the cooling zone CZ provided on the downstream side of the extrusion molding die 1 . Thereby, a series of elongated resin members L are sequentially formed. After the elongated resin member L is sequentially discharged from the resin passage outlet 4 of the resin passage 3, the pressurizing mold 2 is provided at a predetermined interval in front of the resin passage outlet 4. It is inserted through the through hole 63 . Further, the elongated resin member L inserted into the pressurizing die through hole 63 is pressed by a pressing part 64 (to be described later) in the pressurizing die through hole 63 of the pressurizing die 6 to 6 and cut to the desired length to form an extrudate.

[Shape of long resin member]
FIG. 2 is a perspective view including a partial cross section showing an example of the elongated resin member L. As shown in FIG. In addition, FIG. 2 shows a part of the long resin member L in the longitudinal direction. In the extrusion molding die 1 according to this embodiment, an elongated resin member L elongated in the front-rear direction is formed. As shown in FIG. 2, the elongated resin member L has a substantially rectangular outer shape in a cross section perpendicular to the longitudinal direction, and an inverted T-shaped groove is formed on the upper side. The groove portion of the elongated resin member L is formed so as to extend in the longitudinal direction. The elongated resin member L includes a first portion 53 having a flat lower surface and extending in the front-rear direction, and a pair of flat upper surfaces extending upward from both end sides of the first portion 53 in the width direction D1. and a second portion 54, which are integrally formed.

[Configuration of extrusion mold]
FIG. 3 is a cross-sectional view of the extrusion molding die 1 shown in FIG. 3 is a cross-sectional view viewed from the opposite direction to FIG. 1, and the front-rear direction is reversed from that of FIG. As shown in FIGS. 1 and 3 , the extrusion molding die 1 has a main body die 2 and a pressure die 6 .

The main mold 2 is filled with the resin material M from one side by the extruder 50, and the elongated resin member L extruded through the heating and cooling processes is discharged from the other side. A pressure mold 6 is attached to the main mold 2 . The pressurizing die 6 is provided with a pressurizing die through hole 63 through which the elongated resin member L ejected from the main body die 2 is inserted.

[Configuration of main mold]
FIG. 4 is a plan view of the main mold 2 shown in FIG. FIG. 5 is a bottom view of the main mold 2 shown in FIG. The main mold 2 is for extruding a long resin member L, which is a contoured extruded product. As shown in FIGS. 1 and 3 to 5, the main mold 2 includes an upper mold 20 and a lower mold 21 which are clamped together, and a resin material M passes between the upper mold 20 and the lower mold 21. and a resin passage outlet 4 formed downstream of the resin passage 3 . In addition, the main mold 2 is clamped with a mold clamping bolt 22 that clamps the upper mold 20 and the lower mold 21, and a surface pressure adjustment bolt 23 that adjusts the surface pressure of the upper mold 20 and the lower mold 21. A passage outlet mold 24 provided in contact with the downstream ends of the upper mold 20 and the lower mold 21 is further provided.

[Structure of upper mold and lower mold in main mold]
Referring to FIG. 3 , main mold 2 has upper mold 20 and lower mold 21 , and upper mold 20 has upper outer mold 25 and upper middle mold 26 .

The upper outer mold 25 is provided as an upper portion of the upper mold 20 . The upper middle die 26 is provided as a lower portion of the upper die 20 . Referring to FIG. 3, the upper outer mold 25 is formed in a block shape that is long in the front-rear direction and has a predetermined thickness in the vertical direction. Further, the upper outer mold 25 has an upper mold extending portion 27 extending further rearward from the rear portion, as shown in FIG. The upper mold extension part 27 constitutes an extruder connecting part 33 together with a lower mold extension part 32 to be described later in a state where the upper mold 20 and the lower mold 21 are clamped to each other.

An upper outer mold recess 28 into which the upper middle mold 26 is fitted is formed on the lower side of the upper outer mold 25 . The upper middle die 26 is fitted into the upper outer die recess 28 . That is, the upper outer mold 25 and the upper middle mold 26 have a nested structure.

The upper outer mold 25 is formed with a plurality of mold clamping bolt screw holes (not shown) and a plurality of surface pressure adjusting bolt screw holes (not shown). Each screw hole is formed by a screw hole penetrating the upper outer die 25 in the vertical direction.

The mold clamping bolt screw holes are formed corresponding to the positions of the mold clamping bolts 22, as shown in FIG. The screw holes for mold clamping bolts are generally uniformly arranged over both the heating region HZ and the cooling region CZ over the entire upper outer mold 25 . A female screw into which the mold clamping bolt 22 can be screwed is formed on the inner peripheral surface of each mold clamping bolt screw hole.

The surface pressure adjusting bolt screw hole is formed corresponding to the position of the surface pressure adjusting bolt 23, as shown in FIG. A female thread into which the surface pressure adjusting bolt 23 can be screwed is formed on the inner peripheral surface of each surface pressure adjusting bolt screw hole.

Further, referring to FIG. 3 , a plurality of (three in the present embodiment) cooling water pipes 29 are formed in the cooling region CZ of the upper outer die 25 . Each cooling water pipe 29 is formed by a through hole penetrating the cooling region CZ of the upper outer die 25 in the left-right direction. Cooling water flows through the cooling water pipe 29 . As a result, the molten resin material M sequentially conveyed from the heating region HZ of the extrusion molding die 1 can be cooled and solidified.

3 and 4, the heating region HZ of the upper outer mold 25 is provided with a heating mechanism (not shown) constituted by, for example, a mold heater. Thereby, the resin material M passing through the heating zone HZ of the extrusion molding die 1 can be melted.

The upper middle mold 26 is formed in a block shape that is long in the front-rear direction and has a predetermined thickness in the vertical direction. A plurality of die clamping bolt through holes (not shown) are formed in the upper middle die 26 . The mold clamping bolt through-holes are formed corresponding to the positions of the mold clamping bolts 22 in FIG. Each mold clamping bolt through-hole is formed at a position overlapping each mold clamping bolt screw hole when viewed from above and below when the upper middle mold 26 is fitted into the upper outer mold 25 . Each mold clamping bolt through-hole is formed to have a size that allows the mold clamping bolt 22 to pass therethrough.

The main mold 2 has a lower mold 21 , and the lower mold 21 has a lower outer mold 30 and a lower middle mold 31 , as shown in FIG. 3 . The lower outer mold 30 is provided as a lower portion of the lower mold 21 . Referring to FIG. 3, the lower outer mold 30 is formed in a block shape that is long in the front-rear direction and has a predetermined thickness in the vertical direction. 5, the lower outer mold 30 has a lower mold extending portion 32 extending further rearward from the rear portion. The lower die extension part 32 constitutes an extruder connecting part 33 together with the upper die extension part 27 in a state where the upper die 20 and the lower die 21 are clamped to each other.

A lower outer mold recess 34 into which the lower middle mold 31 is fitted is formed on the upper side of the lower outer mold 30 . The lower middle die 31 is fitted into the lower outer die recess 34 . That is, the lower outer mold 30 and the lower middle mold 31 have a nested structure.

A plurality of screw holes 35 for clamping bolts are formed in the lower outer mold 30 . The mold clamping bolt screw holes 35 are formed by screw holes penetrating the lower outer mold 30 in the vertical direction.

The mold clamping bolt screw holes 35 of the lower outer mold 30 are formed corresponding to the positions of the mold clamping bolts 22, as shown in FIG. The mold clamping bolt screw holes 35 are generally uniformly arranged over both the heating region HZ and the cooling region CZ over the entire lower outer mold 30 . A female screw into which the mold clamping bolt 22 can be screwed is formed on the inner peripheral surface of each mold clamping bolt screw hole 35 .

Further, referring to FIG. 3 , a plurality of (three in the present embodiment) cooling water pipes 29 are formed in the cooling zone CZ of the lower outer mold 30 . Each cooling water pipe 29 is formed by a through hole penetrating the cooling region CZ of the lower outer mold 30 in the left-right direction. Cooling water flows through the cooling water pipe 29 . As a result, the molten resin material M sequentially conveyed from the heating region HZ of the extrusion molding die 1 can be cooled and solidified. The heating mechanism of the lower outer mold 30 is the same as that of the upper outer mold 25 described above, so the explanation is omitted.

The lower middle mold 31 is formed in a block shape that is long in the front-rear direction and has a predetermined thickness in the vertical direction. A plurality of die clamping bolt through holes (not shown) are formed in the lower middle die 31 . The mold clamping bolt through-holes are formed corresponding to the positions of the mold clamping bolts 22 shown in FIG. Each mold clamping bolt through-hole is formed at a position overlapping each mold clamping bolt screw hole 35 when viewed from above and below when the lower middle mold 31 is fitted into the lower outer mold 30 . Each mold clamping bolt through-hole is formed to have a size that allows the mold clamping bolt 22 to pass therethrough.

[Configuration of Resin Passage in Main Mold]
1 and 3, resin passages 3 are formed on the mold dividing surfaces, which are the lower surface of the upper mold 20 of the extrusion molding mold 1 and the upper surface of the lower mold 21 . The resin passage 3 is a passage formed for molding the resin material M under conditions such as a predetermined temperature in the upper mold 20 and the lower mold 21 which are clamped together. The resin passage 3 in this embodiment is formed by branching into two in the width direction D1 of the main mold 2 on the upstream side. The resin passage 3 is not limited to being branched into two, and may be branched into three or more. Moreover, the resin passage 3 may be formed by one passage that is not branched. A downstream portion of the resin passage 3 is formed in a rectangular cross section in a direction perpendicular to the direction from upstream to downstream. Also, the resin passage 3 is formed linearly from upstream to downstream, but is not limited to this, and may be curved or bent as necessary.

1 and 3, the resin passage outlet 4 is formed at the downstream end of the main mold 2 and formed at the outlet of the resin passage 3 of the main mold 2. As shown in FIG. The elongated resin member L molded by the main mold 2 is discharged from the resin passage outlet 4 .

The passage outlet mold 24 is formed in a block shape, and is provided with an upstream end face in contact with the downstream end portions of the clamped upper mold 20 and lower mold 21 . A passage outlet hole 36 communicating with the resin passage 3 formed in the upper mold 20 and the lower mold 21 is formed in the passage outlet mold 24 . The passage outlet hole 36 is formed to extend through the resin passage 3 . The passage exit mold 24 is not necessarily required, and the upper mold 20 and the lower mold 21 may be configured without the passage exit mold 24 .

1 and 3, in the extrusion molding die 1 according to the present embodiment, an upper die 20 and a lower die 21 are clamped by clamping bolts 22, and an upper middle die 26 and a lower die 26 are clamped by contact pressure adjusting bolts 23. After the surface pressure adjustment between the medium mold 31 and other molding conditions such as mold temperature are appropriately set, the resin material M is extruded by the extruder 50 . The resin material M extruded by the piston 51 is melted by being heated, passes through the upstream side of the resin passage 3 (that is, the extruder side of the resin passage 3 and the branch passage), and reaches the downstream end of each branch passage. flows into the downstream side of each resin passage 3 from .

The molten resin material M flowing downstream of each resin passage 3 flows into the cooling zone CZ while being heated by the heating mechanism provided in the heating zone HZ. In the upstream side portion (surface solidification region) of the cooling region CZ, the molten resin material M is cooled by the cooling water flowing through the cooling water pipe 29, so that the molten resin flowing downstream of the resin passage 3 is cooled. A surface portion of material M is solidified. Then, in the downstream portion (completely solidified region) of the cooling region CZ, the inside of the resin is solidified. As a result, the elongated resin member L whose surface and inside are solidified is produced, and is discharged from the resin passage outlet 4 to the outside.

[Composition of pressure mold]
FIG. 6 is a perspective view of part of the extrusion die shown in FIG. 1 as viewed from below. FIG. 7 is a cross-sectional view of the extrusion mold shown in FIG. 3 taken along the line AA. FIG. 8 is a partially enlarged cross-sectional view of the extrusion molding die shown in FIG.

The pressurizing die 6 is a separate die from the main die 2 for pressurizing the elongated resin member L molded by the main die 2 and discharged from the resin passage outlet 4 of the main die 2. is. The pressurizing die 6 adjusts the extrusion resistance and extrusion speed of the elongated resin member L, which change with the shrinkage of the resin material M when it cools and solidifies. It is for pressurizing the shaped resin member L in the vicinity of the resin passage outlet 4 of the main mold 2 . The pressurizing die 6 includes an upper pressurizing die 60 , a lower pressurizing die 61 , a pressurizing die connecting bolt 62 , a pressurizing die through hole 63 , and a pressing portion 64 . The pressure mold 6 is provided on the front side of the main mold 2 . 6 shows a state in which the pressure lower mold 61 is removed from the pressure upper mold 60. As shown in FIG. In FIG. 8, the pressing portion 64 and its vicinity are shown in an enlarged manner.

The pressurizing upper mold 60 has a pressurizing portion 65 and a connecting portion 66 . The pressurizing upper die 60 is formed with a pressurizing upper die through groove 67 that forms a pressurizing die through hole 63 through which the long resin member L can be inserted while being clamped with the pressurizing lower die 61 . It is The pressurizing upper mold 60 accommodates a pressing portion 64 for pressurizing the elongated resin member L that is inserted into the pressurizing mold through-hole 63 .

The pressurizing part 65 is a portion on the front side of the pressurizing upper mold 60 and is provided in front of the main body mold 2 at a predetermined interval. The pressurizing part 65 is formed in a block shape. A pressing shaft hole 68 , a contact member accommodating groove 69 , and a pressurizing upper die connecting screw hole 70 are formed in the pressurizing portion 65 .

The pressing shaft hole 68 holds the shaft portion 76 of the pressing shaft 73 of the pressing portion 64 to be described later so as to be able to move forward and backward relative to the pressing upper die 60 . The pressing shaft hole 68 is formed so as to pass through the pressing portion 65 in the vertical direction. Two pressing shaft holes 68 are arranged in the front-rear direction of the pressing portion 65 , and are arranged in two rows in the width direction D<b>1 of the pressing portion 65 . That is, four pressing shaft holes 68 are arranged in the pressurizing portion 65, two on the front side and two on the rear side. A female thread that can be screwed with the shaft portion 76 of the pressing portion 64 is formed on the inner peripheral surface of each pressing shaft hole 68 .

The contact member accommodation groove 69 is formed in a groove shape on the lower surface of the pressurizing upper die 60 and accommodates the contact member 74 of the pressing portion 64 to be described later. The contact member accommodation groove 69 is formed above the pressurizing upper die through groove 67 . More specifically, referring to FIGS. 6 and 7, the contact member accommodation groove 69 is formed as a rectangular groove elongated in the front-rear direction on the lower side of the pressure member 65 when viewed from the bottom. The long resin member L can pass through the pressurizing upper die through groove 67 that forms the upper side of the pressurizing die through hole 63 through which the long resin member L is inserted while the contact member 74 (to be described later) is arranged. It is formed as a groove extending forward and backward. The contact member accommodation groove 69 is formed with a groove width that matches the width of the contact member 74 so that the substantially block-shaped contact member 74 described later is fitted therein. Two contact member housing grooves 69 are formed in a state of being aligned substantially parallel in the width direction D1 of the pressure member 65 . Two pressing shaft holes 68 are formed in the front-rear direction in each of the contact member accommodating grooves 69 formed in the pressing portion 65 .

The pressurizing upper die connecting screw hole 70 is formed in the lower surface of the pressurizing upper die 60 and has a female thread into which the pressurizing die connecting bolt 62 can be screwed.

The connection part 66 is a part for connecting the pressing die 6 to the main body die 2 via a screw or the like. 3 and 6, connecting portion 66 is formed in a block shape having a predetermined thickness and extends rearward above pressing portion 65 . The connecting portion 66 passes through the upper surface of the passage outlet mold 24 and extends rearward from the front end portion of the main mold 2 on the front upper surface of the main mold 2 . The connecting portion 66 is fixed to the main mold 2 by a connecting member such as a screw. The pressurizing part 65 is provided at a predetermined interval in front of the main mold 2, but is placed in contact with the passage outlet mold 24 of the main mold 2. good too.

3 and 7, the pressure lower die 61 is clamped with the pressure upper die 60 and forms a pressure die through hole 63 through which the elongated resin member L can be inserted. ing. The pressure mold 61 is formed with a pressure mold through groove 71 forming a pressure mold through hole 63 through which the long resin member L can be inserted while being clamped with the pressure upper mold 60 . ing. The pressure mold 61 is formed with a pressure mold through groove 71 and a pressure mold connection hole 72 .

The elongated resin member L ejected from the resin passage outlet 4 of the main mold 2 is inserted into the pressurizing die through groove 71 in a state where the pressurizing upper die 60 is clamped. Similar to the contact member accommodating groove 69 of the pressure member 65, the two pressure-lower die through grooves 71 are arranged side by side in the width direction D1 of the pressure lower die 61 corresponding to the resin passage 3 branching into two. are placed. A pressurized die through groove 71 forming the lower side of the pressurized die through hole 63 is formed as a groove extending in the front-rear direction through which the elongated resin member L can pass.

The pressurizing die connecting hole 72 is formed so as to vertically penetrate the pressurizing die 61 . The pressurized mold connection hole 72 communicates with the pressurized upper mold connection screw hole 70 . A pressurized mold connection bolt 62 is inserted through the pressurized mold connection hole 72 .

The pressure die connecting bolt 62 is a bolt for connecting the pressure upper die 60 and the pressure lower die 61 to each other. The pressurizing die connecting bolt 62 is inserted through the pressurizing die connecting hole 72 from below and screwed into the pressurizing upper die connecting screw hole 70 communicating with the pressurizing die connecting hole 72 .

The pressurizing die through-hole 63 is a hole formed in the pressurizing die 6 in the front-rear direction for inserting the elongated resin member L discharged from the resin passage outlet 4 of the main body die 2 . The pressure die through hole 63 is formed on an extension line of the resin passage outlet 4 of the main die 2 . The pressure mold through hole 63 is formed in a state where the pressure upper mold 60 and the pressure lower mold 61 are clamped so that the pressure upper mold through groove 67 and the pressure lower mold through groove 71 face each other. The pressurized mold through hole 63 is formed in a substantially rectangular cross section in a direction perpendicular to the advancing direction of the long resin member L, and extends substantially parallel to the extension line of the resin passage 3 of the main mold 2 . ing. The pressure die through holes 63 are provided in front of the passage outlet die 24 at predetermined intervals. Further, the pressurizing die through-hole 63 is formed in the pressurizing die 6 so as to be provided on an extension line of the resin passage outlet 4 of the passage outlet die 24 . The pressurizing die through-hole 63 may communicate with the resin passage outlet 4 by arranging the pressurizing portion 65 in contact with the main die 2 .

The pressing portion 64 is provided to press the elongated resin member L passing through the pressing die through hole 63 of the pressing die 6 . Referring to FIG. 8, the pressing portion 64 presses the long resin member L in a direction intersecting with the traveling direction of the long resin member L. As shown in FIG. Further, in the present embodiment in which a plurality of pressurizing die through holes 63 through which the elongated resin member L is inserted are formed in the pressurizing die 6, the pressing portion 64 passes through the pressurizing die 6. It is provided in multiple numbers so that each long resin member L which carries out can be pressed. More specifically, the pressing portion 64 pushes the plurality of elongated resin members L discharged from the resin passage 3 branched into the plurality of resin passages 3 in the main mold 2 to the extension of the resin passage outlet 4 of the main mold 2 . It is configured to be pressed in each pressurizing die through-hole 63 arranged on a line. The pressing portion 64 has a pressing shaft 73 , a contact member 74 and a pressing adjustment member 75 .

The pressing shaft 73 is for applying a pressing force to the contact member 74 that contacts the elongated resin member L. As shown in FIG. In this embodiment, the pressing shaft 73 is configured as an integral shaft member and formed in a substantially cylindrical shape. The pressing shaft 73 has a shaft portion 76 , a head portion 77 , a tip side groove portion 78 , and a tip enlarged diameter portion 79 . A male thread is formed on the outer peripheral surface of the shaft portion 76 , and the pressing shaft 73 is rotatably provided in a pressing shaft hole 68 having a female thread so as to advance and retreat. That is, the pressing shaft 73 of the pressing portion 64 is provided so that the tip portion thereof can move forward and backward with respect to the pressure die through hole 63 .

Two pressing shafts 73 are arranged in the front-rear direction corresponding to the pressing shaft hole 68 , and are arranged in two rows in the width direction D<b>1 of the pressure member 65 . That is, the pressing shafts 73 are arranged in the pressing portion 65 in total four, two on the front side and two on the rear side.

A head portion 77 is provided at the upper end portion of the pressing shaft 73, and is configured so that torque can be applied using a tool. A tip-side groove portion 78 having a diameter smaller than that of the shaft portion 76 is formed in the tip-side portion of the pressing shaft 73 . Further, the pressing shaft 73 is formed with a tip enlarged diameter portion 79 at the tip portion. The tip-side groove portion 78 is a groove formed along the circumferential direction of the pressing shaft 73, and the cross-sectional shape of the tip-side groove portion 78 in a cross section perpendicular to the axial direction of the pressing shaft 73 is formed circular. The tip enlarged diameter portion 79 also has a circular cross section in the direction perpendicular to the axial direction of the pressing shaft 73 . The tip enlarged diameter portion 79 is formed to have a larger diameter than the tip side groove portion 78 .

The contact member 74 is arranged in the pressure die through-hole 63 and is provided so as to contact the elongated resin member L. As shown in FIG. Further, the contact member 74 is formed so that the area that contacts the elongated resin member L is larger than the area of the tip surface of the pressing shaft 73 . The contact member 74 is provided at the tip portion of the pressing shaft 73 . The contact member 74 is formed in a substantially block shape elongated in the front-rear direction. The contact member 74 is provided to move back and forth from the contact member accommodation groove 69 , and is arranged such that the longitudinal direction of the contact member 74 is substantially parallel to the longitudinal direction of the elongated resin member L.

Also, the contact member 74 is provided slidably with respect to the pressurizing die through-hole 63 . The contact member 74 rotatably supports the two pressing shafts 73 in the front-rear direction, which is the longitudinal direction. The contact member 74 is provided so as to fit into the contact member accommodation groove 69 of the pressure member 65 . More specifically, two contact members 74 are provided side by side in the width direction D<b>1 of the pressure member 65 . The contact member 74 has a contact surface 80 and a groove portion 81 .

The contact surface 80 is the surface of the contact member 74 that contacts the elongated resin member L, that is, the lower surface of the contact member 74 . The contact surface 80 has a rectangular shape in a bottom view and is formed in a planar shape. The contact surface 80 is pressed by the pressing shaft 73 and comes into contact with the second portion 54 of the elongated resin member L. As shown in FIG.

The contact surface 80 is formed with a width longer than the maximum width of the elongated resin member L. The length of the contact surface 80 in the longitudinal direction, which is the direction substantially parallel to the direction in which the pressurizing die through hole 63 extends, is at least longer than the maximum width of the elongated resin member L. ing. Further, the contact surface 80 of the contact member 74 is set so that the length in the longitudinal direction extends from the vicinity of the entrance of the pressurizing die through-hole 63 to the vicinity of the exit thereof.

The groove portion 81 is formed substantially in the center of the upper surface of the contact member 74 in the width direction D<b>1 so as to extend in the front-rear direction parallel to the pressurizing die through hole 63 . The groove portion 81 is formed so that the tip enlarged diameter portion 79 of the pressing shaft 73 is slidably fitted therein, and in a cross section perpendicular to the extending direction of the pressing die through-hole 63, the groove portion 81 is on the opening side. On the other hand, the bottom side is widened. More specifically, the tip side portion of the pressing shaft 73 has a cross-sectional shape in a direction perpendicular to the direction in which the pressurizing die through hole 63 extends, which is similar to the cross-sectional shape of the groove portion 81, and The contact member 74 is slidable with respect to the pressing shaft 73 because the contact member 74 is formed so as to widen downward from the bottom.

The pressing adjustment member 75 is a member for fixing the pressing shaft 73 to the pressing portion 65 and adjusts the amount of protrusion of the contact member 74 with respect to the pressing die through hole 63 . The pressing adjustment member 75 has a female thread corresponding to the male thread of the pressing shaft 73 on the inner peripheral surface. That is, the pressing adjustment member 75 can move vertically with respect to the pressing shaft 73 by rotating. The pressing adjustment member 75 can fix and release the pressing shaft 73 from the pressing portion 65 by moving the pressing shaft 73 in the state of being attached to the pressing portion 65 in the vertical direction. More specifically, when the pressing shaft 73 is released from fixation, the pressing shaft 73 moves vertically with respect to the pressing portion 65 by being rotated, and becomes a contact member with respect to the pressing die through hole 63 . The position of 74 is adjusted. Then, when the pressure adjustment member 75 is moved downward and the pressure shaft 73 is fixed to the pressure member 65 , the contact member 74 is fixed at a desired position in the pressure die through-hole 63 . In this manner, the pressure applied to the elongated resin member L can be adjusted.

[Operation of extrusion mold]
In the extrusion molding die 1, the pellet-shaped resin material M sequentially extruded by the piston 51 of the extruder 50 is heated and melted in the heating region HZ, and formed in the extrusion molding die 1. It passes through the resin passage 3. The molten resin material M passing through the resin passage 3 is cooled and solidified in the cooling zone CZ provided on the downstream side of the extrusion molding die 1 . Thereby, a series of elongated resin members L are sequentially formed.

The formed elongated resin member L is sequentially discharged from the resin passage outlet 4 of the resin passage 3, and then pressurized by the pressure mold 2 provided at a predetermined interval in front of the resin passage outlet 4. It is inserted through the die through hole 63 . The elongated resin member L inserted into the pressurizing die through-hole 63 is pressed by the pressing portion 64 in the pressurizing die through-hole 63 of the pressurizing die 6, and then Extrudates are formed by exiting from 6 and cutting to desired lengths.

[Actions and effects of the present embodiment]
In a conventional extrusion molding die, for example, a die having a clamping bolt, a surface pressure adjusting bolt, and a cooling water pipe is further provided with a pressing portion to press the elongated resin member. However, in the extrusion molding die 1 of the present embodiment, the resin material M filled in is heated and cooled, and the long resin member L extruded is ejected from the main body die 2. The pressurizing die 6 provided with the pressurizing die through hole 63 through which the resin member L is inserted is placed on the extension line of the resin passage outlet 4 of the main die 2. and can be installed. The pressing mold 6 is provided with a pressing portion 64 that presses and presses the elongated resin member L in a direction intersecting with the traveling direction thereof. For this reason, the main mold 2 is provided with a mold clamping bolt 22, a surface pressure adjusting bolt 23, and a cooling water pipe 29, and a long resin A pressing portion 64 that presses and pressurizes the member L can be provided. As a result, the pressing portion 64 is not provided in the main mold 2, but is provided in the pressing mold 6 externally attached to the main mold 2, so that the shape of the pressing portion 64 is limited as in the conventional art. Therefore, the pressing portion 64 can be sized such that the surface pressure on the elongated resin member L does not increase. In addition, it becomes easy to change the shape of the pressing portion 64 according to the shape of the elongated resin member L. In addition, since the pressure mold 6 is provided with the pressing portion 64, by changing the pressing force of the pressing portion 64 on the long resin member L, the long resin member L formed by extrusion molding can be The pressure applied can be adjusted. Further, even when a plurality of elongated resin members L are molded at the same time, the pressing force of the pressing portion 64 that presses the elongated resin members L passing through the pressure die through hole 63 is adjusted. Thus, the extrusion speed can be controlled so as to suppress variations in the extrusion speed of the elongated resin member L. Therefore, even when a plurality of elongated resin members L are molded at the same time, the speed at which the elongated resin members L are extruded can be easily adjusted by the pressing portion 64 of the pressure die 6 .

Therefore, according to the extrusion molding die 1, it is possible to adjust the pressure applied to the elongated resin member L molded by extrusion molding, and even when a plurality of elongated resin members L are molded at the same time, the extrusion can be performed. It is possible to provide an extrusion molding die 1 capable of easily adjusting the speed and forming a long resin member L with an excellent appearance.

Further, in the extrusion molding die 1 , the elongated resin member L is pressed by the contact member 74 having a larger area than the tip surface of the pressing shaft 73 . As a result, the pressure with which the pressing portion 64 presses the long resin member L is reduced, so that the pressed long resin member L is less likely to undergo plastic deformation. Therefore, traces are less likely to remain on the elongated resin member L, and the elongated resin member L with excellent appearance can be molded.

Further, in the extrusion molding die 1, the elongated resin member L is pressed by the contact surface 80 formed with a width longer than the maximum width of the elongated resin member L. As shown in FIG. As a result, the pressing portion 64 suppresses the occurrence of traces formed on the inner side of the long resin member L in the width direction, and the long resin member L having excellent external appearance can be molded.

Further, in the extrusion molding die 1 , the elongated resin member L is pressed by the contact surface 80 whose length in the longitudinal direction is longer than the maximum width of the elongated resin member L. As a result, traces formed in the longitudinal direction of the elongated resin member L by the pressing portion 64 are further suppressed, and the elongated resin member L having excellent external appearance properties can be molded. It should be noted that the contact member 74 may have a form in which the longitudinal length of the contact surface 80 of the contact member 74 is set to extend from the entrance to the exit of the pressure die through-hole 63 .

Further, in the extrusion molding die 1, the pressing shaft 73 has a tip enlarged diameter portion 79 at the tip portion, and the contact member 74 is formed so that the tip enlarged diameter portion 79 is slidably fitted. It has a groove 81 . Thereby, the contact member 74 is slidably held with respect to the pressing shaft 73 . Further, in the extrusion molding die 1, the contact member 74 has a groove portion 81 extending parallel to the pressing die through-hole 63, and the pressing portion 64 is formed by widening the bottom side with respect to the opening side. It has a tip enlarged diameter portion 79 so as to fit in corresponding to the groove portion 81 formed therein. As a result, the contact member 74 is slidably held with respect to the pressing shaft 64 while being held by the enlarged diameter portion 79 at the distal end. Therefore, the contact member 74 can be easily held with respect to the pressing shaft 73 in the pressurizing die through hole 63 . When the contact member 74 fitted in the pressure die through hole 63 of the pressure die 6 is removed from the pressure die 6 , the contact member 74 is pushed through the pressure die by the pressing shaft 73 . It is suspended in the hole 63 . In this state, the contact member 74 is slid in a direction parallel to the direction in which the pressurizing die through hole 63 extends, and the contact member 74 fitted in the pressurizing die through hole 63 is easily moved from the pressing shaft. can be removed. Therefore, according to the above configuration, the contact member 74 can be easily held by the pressing shaft 73 in the pressurizing die through hole 63 , and the work of removing the contact member 74 from the pressurizing die 6 is also possible. can be easily done.

[Modification]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented with various modifications within the scope of the claims. For example, the following modifications may be implemented.

(1) In the above-described embodiment, the pressing portion includes the contact member and the pressing shaft provided as separate members, but this does not have to be the case. A form in which the pressing portion is configured as an integral member may be implemented.

(2) In the above-described embodiment, the contact member is formed in a substantially block shape elongated in the front-rear direction, but is not limited to this. For example, the contact member may be formed as a cylindrical or disk-shaped member having a shape and thickness corresponding to the shape and depth of the contact member housing groove.

(3) In addition, in the above-described embodiments, the contact surface, which is the lower surface of the contact member, is formed in a planar shape, but the present invention is not limited to this. For example, the contact surface 80 may be spherical or curved.

(4) In the above-described embodiment, the pressing shaft in the pressing portion is provided as an integral shaft member, but this need not be the case. A form of the pressing shaft may be implemented in which two shaft portions provided separately rather than integrally are connected via a spring portion.

FIG. 9 is a cross-sectional view of an extrusion molding die 1a according to a modification of the present invention. FIG. 10 is a cross-sectional view of the extrusion molding die 1a shown in FIG. 9, taken along line BB. Hereinafter, an extrusion molding die 1a according to a modification of the present invention will be described with reference to FIGS. 9 and 10 and the like. In addition, in the following description of the modified example, a configuration different from that of the above-described embodiment will be described. overlapping description will be omitted.

The extrusion molding die 1a according to the modification has a main body die 2 and a pressing die 6a, like the extrusion molding die 1 of the above-described embodiment. As with the pressure die 6 of the extrusion molding die 1, the pressure die 6a includes a pressure upper die 60, a pressure lower die 61, a pressure die connection bolt 62, and a pressure die through hole. It has a hole 63 and a pressing portion 64a. The pressing portion 64 a is configured in the same manner as the pressing portion 64 of the pressing mold 6 and has a pressing shaft 73 a , a contact member 74 and a pressing adjustment member 75 . However, the pressing portion 64a differs from the pressing portion 64 of the above embodiment in the configuration of the pressing shaft 73a.

Two pressing shafts 73a are arranged side by side along the front-rear direction in the pressing portion 65 of the pressing die 6a, and are further arranged in two rows in the width direction D1. That is, in the pressurizing portion 65, a total of four pressing shafts 73a are arranged, two on the front side and two on the rear side. 9 and 10, each pressing shaft 73a includes a first shaft portion 82, a second shaft portion 83, a spring portion 84, and a spring receiving member 85. .

The first shaft portion 82 is provided with a head portion 77 and is provided as a shaft member having an outer peripheral surface formed with a male screw that is screwed into a pressing shaft hole 68 provided in the pressure member 65 . A press adjusting member 75 is screwed into the first shaft portion 82 on the head 77 side, and is fixed to the pressurizing portion 65 by the press adjusting member 75 in a state of being screwed into the press shaft hole 68 . be done. Thereby, the first shaft portion 82 is configured to be positioned in the pressurizing portion 65 of the pressurizing die 6a.

The spring receiving member 85 is screwed and attached to the first shaft portion 82 and is provided as a portion with which one end of the spring portion 84 abuts. The spring receiving member 85 is installed in a spring chamber 86 formed in the pressurizing portion 65 and in which the spring portion 84 is arranged. is fixed to the first shaft portion 82 at a predetermined position in . A spring chamber 86 in which the spring portion 83 is arranged is provided as a through hole that communicates the pressing shaft hole 68 and the contact member accommodating groove 69 in the pressure portion 65 . The spring chamber 86 is provided so as to extend in series along the same axial direction as the pressing shaft hole 68 and is formed as a through hole having a larger diameter than the pressing shaft hole 68 .

The second shaft portion 83 is provided separately from the first shaft portion 82 and is provided as a shaft member that is arranged in series along the same axial direction with respect to the first shaft portion 82 and contacts the contact member 74 . It is The second shaft portion 83 is provided with a tip side groove portion 78 and a tip enlarged diameter portion 79 , and is provided with a spring receiving portion 83 a that contacts the spring portion 84 . The spring bearing portion 83a is provided as a portion of the second shaft portion 83 whose diameter is enlarged like a flange. The spring receiving portion 83 a is provided as a portion to which the spring receiving member 85 contacts the other end of the spring portion 84 and the biasing force from the spring portion 84 is transmitted. Further, the tip side groove portion 78 and the tip enlarged diameter portion 79 of the second shaft portion 83 are in contact with the contact member 74 and fit into the groove portion 81 of the contact member 74, and are inserted into the contact member accommodation groove 69 together with the contact member 74. placed. On the other hand, the spring receiving portion 83 a of the second shaft portion 83 is arranged in the spring chamber 86 .

The spring portion 84 is arranged in a spring chamber 86 inside the pressurizing portion 65 and is arranged between the first shaft portion 82 and the second shaft portion 83 . The spring portion 84 is provided as a spring member that connects the first shaft portion 82 and the second shaft portion 83 so that the biasing force can be transmitted between the first shaft portion 82 and the second shaft portion 83 . . In addition, in this embodiment, the spring portion 84 is provided as a coil spring. More specifically, one end of the spring portion 84 abuts on a spring receiving member 85 attached to the first shaft portion 82 positioned on the pressing portion 65 , and the other end of the spring portion 84 contacts the second shaft portion 83 . is provided so as to abut against the spring receiving portion 83a. Thereby, the spring portion 84 connects the first shaft portion 82 and the second shaft portion 83 so as to be able to bias the second shaft portion 83 in a direction separating from the first shaft portion 82 . The spring portion 84 is configured to bias the second shaft portion 83 from the first shaft portion 82 side toward the contact member 74 side.

FIG. 11 is a diagram for explaining the operation of the extrusion molding die 1a. FIG. 11(a) shows a state in which the first shaft portion 82 of the pressing shaft 73a is fixed to the pressing portion 65 while protruding from the pressing portion 65 to the maximum. On the other hand, in FIG. 11(b), the first shaft portion 82 of the pressing shaft 73a is pushed into the pressing portion 65 by the pressing amount x from the state of FIG. 11(a). Indicates a fixed state. Both FIGS. 11(a) and 11(b) show part of the cross section of the extrusion molding die 1a corresponding to the position of arrows BB in FIG.

When the long resin member L is molded in the extrusion molding die 1a, the first axis of the pressing shaft 73a is adjusted so that the pressure applied to the long resin member L is adjusted to a desired pressure. The portion 82 is pushed into the pressing portion 65 by a desired pushing amount and fixed. For example, as shown in FIG. 11B, the first shaft portion 82 of the pressing shaft 73a is fixed to the pressing portion 65 while being pressed into the pressing portion 65 by a pressing amount x. FIG. 11(b) illustrates a state in which the first shaft portion 82 is pushed into the pressure portion 65 by a push amount x, and the elongated resin member L having a thickness of T is pressed. is doing.

For example, in the state shown in FIG. 11(a), when the spring portion 84 is in a state of natural length, in the state shown in FIG. 11(b), the pressing shaft 73a generates a pressing force proportional to the pressing amount x. Become. That is, in the state shown in FIG. 11B, when the spring constant of the spring portion 84 is E, the pressing shaft 73a pushes the contact member 74 to the long resin member L in order to generate a pressure to press the long resin member L. As the pressing force F that presses toward the member L, a pressing force F having a magnitude of E×x (that is, F=E×x) is generated. A frictional force is generated in the elongated resin member L with the pressing force F as a normal force. Here, during molding of the long resin member L, the amount of shrinkage during cooling and solidification in the main mold 2 decreases or increases, and the thickness dimension of the long resin member L is changed. The operation of the mold 1a will be explained.

First, when the amount of shrinkage during cooling and solidification in the main mold 2 decreases, and the thickness dimension of the elongated resin member L increases by Δt, changing from T to T1 (that is, T1=T+Δt). , the spring portion 84 will be further compressed by Δt. At this time, a pressing force F having a magnitude of E×(x+Δt) (that is, F=E×(x+Δt)) is generated. Therefore, the pressing force F acting on the elongated resin member L via the contact member 74 increases by E×Δt. In the case of the extrusion molding die 1 of the above-described embodiment, the pressing shaft 73 is not provided with the spring portion 84 . Therefore, in the case of the extrusion molding die 1, when the thickness dimension of the elongated resin member L changes from T to T1 (T1=T+Δt), the pressing force F greatly increases, and the pressing force greatly increases. A very large frictional force with the pressure F acting as a normal force acts on the elongated resin member L. However, in the case of the extrusion molding die 1a, as described above, the spring portion 84 is compressed by Δt to absorb the variation in the thickness dimension of the long resin member L, and the pressure acting on the long resin member L is reduced. The increase in pressure F will be limited to E×Δt only. Therefore, the increase in the frictional force acting on the elongated resin member L is suppressed.

In addition, the amount of shrinkage during cooling and solidification in the main mold 2 increases, and the thickness dimension of the long resin member L decreases by Δt, changing from T to T2 (that is, T2=T−Δt). In this case, the spring portion 84 is further extended by Δt. At this time, a pressing force F having a magnitude of E×(x−Δt) (that is, F=E×(x−Δt)) is generated. Therefore, the pressing force F acting on the elongated resin member L via the contact member 74 is reduced by E×Δt. In the case of the extrusion molding die 1 of the above-described embodiment, the pressing shaft 73 is not provided with the spring portion 84 . Therefore, in the case of the extrusion molding die 1, when the thickness dimension of the elongated resin member L changes from T to T2 (T1=T−Δt), the pressing force F is greatly reduced and greatly reduced. A very small frictional force acting on the elongated resin member L with the applied pressing force F acting as a normal force acts on the elongated resin member L. However, in the case of the extrusion molding die 1a, as described above, the spring portion 84 extends by Δt to absorb the variation in the thickness dimension of the long resin member L, and the pressing force acting on the long resin member L is The decrease in F will be limited to E×Δt only. Therefore, the decrease in the frictional force acting on the elongated resin member L is suppressed to be small.

As described above, even if the amount of shrinkage during cooling and solidification in the main mold 2 during molding of the long resin member L changes and the thickness dimension of the long resin member L fluctuates. In the extrusion molding die 1a, the fluctuation of the pressing force F acting on the elongated resin member L is suppressed so as to be small. Therefore, fluctuations in the frictional force acting on the elongated resin member L are also suppressed to be small, and fluctuations in the extrusion resistance and the extrusion speed of the elongated resin member L are suppressed. Furthermore, when a plurality of elongated resin members are molded at the same time, the occurrence of variations in extrusion speed can be suppressed more efficiently. In addition, in the extrusion molding die 1a, the spring portion is arranged so that the amount of change in the amount of contraction of the elongated resin member L is sufficiently small relative to the amount of pushing x for generating the pushing force F. By appropriately setting the spring constant E of the spring portion 84 and the natural length of the spring portion 84, fluctuations in the pressing force F acting on the elongated resin member L can be greatly reduced.

As described above, according to the extrusion molding die 1a of this modified example, the pressing shaft 73a that presses the contact member 74 is connected via the spring portion 84 to the first shaft portion 82 and the second shaft portion 83. configured with Then, the second shaft portion 83 is biased by the spring portion 84 from the first shaft portion 82 positioned in the pressurizing die 6a toward the contact member 74, so that the contact member 74 becomes the long resin member L. press . Therefore, in the extrusion molding die 1a, the long resin member L can be pressed via the spring portion 84 in the pressing portion 64a. Therefore, even if the amount of shrinkage of the elongated resin member L ejected from the main mold 2 changes and the dimension changes, the spring portion 84 of the pressing shaft 73a in the pressing mold 6a is , the pressure can be autonomously adjusted so that the variation in the pressure applied to pressurize the elongated resin member L is reduced. As a result, even if the length of the resin member L ejected from the main mold 2 fluctuates, the pressure applied to the long resin member L in the pressing mold 6a can be greatly reduced. , and the extrusion resistance and extrusion speed can be adjusted autonomously. In addition, when a plurality of elongated resin members L are molded at the same time, it is possible to more efficiently suppress the occurrence of variations in the extrusion speed.

INDUSTRIAL APPLICABILITY The present invention can be widely applied to extrusion molding dies used for extrusion molding long molded articles.

1 Extrusion Mold 2 Main Mold 3 Resin Passage 4 Resin Passage Outlet 6 Pressing Die 20 Upper Die 21 Lower Die 50 Extruder 63 Pressing Die Through Hole 64 Pressing Part 73 Pressing Shaft 74 Contact Member 79 Tip Expansion Diameter portion 80 Contact surface 81 Groove portion L Long resin member M Resin material

Claims (6)

A main mold, which is filled with a resin material from one side by an extruder and extruded from the other side through heating and cooling processes, is discharged from the main mold, and is provided separately from the main mold. The elongated resin member, which is externally attached to the main body mold through a process of heating and cooling in the main body mold, is extruded and is discharged from the main body mold, is inserted. a pressing die provided with a pressing die through-hole;
The main mold includes an upper die and a lower die that are clamped together, a resin passage formed between the upper die and the lower die through which a resin material passes, and a downstream side of the resin passage. and a resin passage outlet;
The pressurizing mold externally attached to the main mold is arranged on an extension line of the resin passage outlet of the main mold, and the length is discharged from the resin passage outlet to the outside of the main mold. In order to press the pressurizing die through-hole through which the elongated resin member is inserted and the elongated resin member passing through the pressurizing die through-hole, the traveling direction of the elongated resin member intersects. and a pressing portion that presses the elongated resin member in a direction. In the extrusion mold according to claim 1,
The pressing portion has a contact member that is arranged in the pressurizing die through-hole and contacts the elongated resin member, and a pressing shaft that presses the contact member toward the elongated resin member. ,
A die for extrusion molding, wherein an area where the contact member contacts the elongated resin member is larger than an area of a tip surface of the pressing shaft. In the extrusion mold according to claim 2,
A mold for extrusion molding, wherein the contact member has a contact surface formed with a width longer than the maximum width of the elongated resin member on a side that contacts the elongated resin member. In the extrusion mold according to claim 2,
The contact member has a contact surface whose length in the longitudinal direction is at least longer than the maximum width of the elongated resin member on the side that contacts the elongated resin member. Extrusion mold. In the extrusion mold according to any one of claims 2 to 4,
The pressing shaft has a tip enlarged diameter portion at the tip portion,
The contact member has a groove extending parallel to the pressurizing die through-hole,
The groove portion is formed so that the enlarged tip end portion is slidably fitted therein, and the bottom side is widened with respect to the opening side in a cross section perpendicular to the direction in which the pressure die through-hole extends. A mold for extrusion molding, characterized in that it is formed by The extrusion mold according to any one of claims 2 to 5,
The pressing shaft is provided separately from the first shaft portion positioned in the pressing mold, and is arranged in series with the first shaft portion along the same axial direction. a second shaft portion arranged to abut on the contact member; and a second shaft portion arranged between the first shaft portion and the second shaft portion from the side of the first shaft portion toward the side of the contact member. and a spring portion that biases the shaft portion.

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