JPH07106582B2 - Mold structure for molding hollow molded products - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding structure for a hollow molded product in which each divided product of the hollow molded product is individually molded by primary injection and then these divided products are joined by secondary injection. It is a thing.

[0002]

2. Description of the Related Art Conventionally, in general, a hollow molded article having a hollow chamber is subjected to primary molding of two divided bodies obtained by splitting the hollow molded article into the same mold, and thereafter, by moving the movable mold, The divided bodies are superposed, and in this state, they are joined together by secondary forming to form the pieces.

As disclosed in Japanese Patent Application Laid-Open No. 62-87315, a mold for molding the above hollow molded article is provided with a sprue and a runner as a molten resin supply passage. Also, as disclosed in Japanese Patent Application No. 3-204208, it has been proposed to provide a hot runner as a molten resin supply path, and all of these molds are joined to each divided body. Is formed on the mold-splitting surface, which enables abutting and joining of the respective joining sites during the secondary injection.

[0004]

However, in the case of a die having a sprue and a runner, or a hot runner as in the above-mentioned conventional technique, which is used to form a hollow molded article by joining the divided bodies, it is possible to improve the shape of the secondary molding. For the reason, the shape of each divided body formed by the primary forming is limited to the box shape. Therefore, the shape of the hollow molded article to be finally molded is limited to only a hollow chamber.
For example, a cylinder head cover with a baffle plate, which has a hollow chamber on the upper side and has a brim-shaped projection for mounting on the outer peripheral edge of the lower end, has a hat-shaped cross section as a whole, and is a hollow molded product. It has a problem that it cannot be molded as.

When the shape of one of the divided bodies that is primarily formed by the above-mentioned die is a shape in which a brim-shaped protrusion is provided on the outer peripheral edge of the lower end, the joining portion is on the mold dividing surface. Therefore, a hollow chamber is formed above the brim-shaped protrusion during the secondary molding. For this reason, the molten resin for secondary molding flows from the joining site into the hollow chamber,
As a result, the hollow molded article cannot be molded into a desired shape.

[0006]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the structure of the molding die for hollow molding according to claim 1 of the present invention takes the following means.

That is, after the first and second divided bodies of the hollow molded product are molded in the cavity between the fixed mold and the movable mold by the primary injection, one of the first and second divided bodies is kept in the fixed mold.
It is held and the movable mold is moved while the other is held by the movable mold so that the two divided bodies are superposed on each other.
After that, by joining the two divided bodies by secondary injection ,
A molding structure for a hollow molded article, wherein a hollow chamber is formed between the first split body and the second split body, and the second split body has an opening on the side of the joint with the second split body. Contact with the first division
The coupling portion end by the flange-shaped projecting portion is formed at the outer peripheral edge portion of the opposite end has a shape that forms a cross-hat, the secondary injection
The joining cavity is formed on the side of the fixed mold with a predetermined distance from the split surface between the fixed mold and the movable mold .

Further, the molding die structure for a hollow molded article according to claim 2 is the same as the molding die structure for a hollow molded article according to claim 1, wherein the following means are taken.

That is, the fixed type is divided by primary injection.
On the outer surface of the body , there is formed a convex portion for arranging the groove portion, and the groove portion of the above-mentioned divided body is used for the above-mentioned joining key during the secondary injection.
A supply path for supplying the molten resin to the cavity is formed, and the molten resin is solidified and embedded in a predetermined outer surface shape.

[0010]

According to the molding die structure for a hollow molded article of the first aspect , the first divided body and the second divided body are molded in the cavity between the fixed die and the movable die by the primary injection. Thereafter, the fixed one of the first and second divided member, or other
The movable die is moved with the movable die held by the movable die, and the first and second divided bodies are superposed on each other. Then, by the secondary injection, the joining key for the first and second divided bodies is joined.
Yabiti, i.e. the molten resin is supplied to the junction of the first and second divided member, bonded between two divided members.

By the way, the above-mentioned joining cap by the secondary injection is used.
Since the vity is formed on the fixed mold side with a predetermined distance from the mold split surface of the fixed mold and the movable mold , the joint part in the state where both divided bodies are superposed and the brim shape of the second divided body side. The protrusion is in a state of being blocked by the fixed mold. For this reason,
There is no risk that the molten resin for secondary molding will flow from the bonding cavity into the flange-shaped protrusion on the second divided body side . As a result , it becomes possible to mold a hollow molded article having a hollow chamber and having a flange-shaped projection on the outer peripheral edge of one end .

Further, according to the molding die structure of the hollow molding product according to the second aspect, by forming the convex portion on the fixed die, the groove portion is provided on the outer surface of the divided body by the primary injection. Then, this groove portion is filled with a predetermined outer surface shape by supplying molten resin to the bonding cavity at the time of secondary injection and then solidifying the molten resin. Therefore, during the primary injection
It is possible to form the molten resin supply path with a simple structure while supplying the molten resin in two directions in order to mold the two divided bodies and blocking the one supply during the secondary injection.

[0013]

[Embodiment 1] The following will describe one embodiment of the present invention with reference to FIGS. 1 to 5.

As shown in FIG. 1, the mold according to this embodiment is a fixed mold 1 in which a resin supply port 10a of an injection machine 10 is arranged.
And a movable die 2 capable of opening / closing in the left-right direction and sliding in the up-down direction, and configured as a die slide type die structure.

The stationary mold 1 is formed with a hot runner 3 having a heating means 4 such as a heater arranged on the outer periphery thereof. One end side of the hot runner 3 is communicated with the resin supply port 10a of the injection machine 10, while the hot runner 3 is split into two in the middle so that each other end side is communicated with the first and second cavities 7 and 9 described later. Then, the molten resin injected and injected from the injection machine 10 is supplied to each of the cavities 7 and 9 in a molten state. Further, an on-off valve 5 is provided in an intermediate path of the hot runner 3 on the side of the second cavity 9, and the on-off valve 5 controls the supply of the molten resin to the second cavity 9 by the opening / closing operation thereof. It is like this.

Further, the fixed die 1 and the movable die 2 are adapted to be mutually die-matched with the die-splitting surface A as a center, and each die 1 and 2 in such die-matching state. on the upper side is a while the two-divided hollow molded article in the vertical
A first cavity 7 for molding the upper divided body 6 as the first divided body is formed, while the other side is formed on the lower side.
A second cavity 9 for molding the lower divided body 8 as a certain second divided body is formed.

[0017] The first cavity 7, a first female part 1a for molding the outer surface shape of the upper split body 6 to the mold parting plane A of the fixed mold 1 is formed in a concave shape, the mold split plane A of the movable die 2 It is formed in a convex shape in the first male part 2a for molding the inner surface shape of the upper split body 6
And is formed by cooling and solidifying the molten resin between the first female mold portion 1a and the first male mold portion 2a.
A box-shaped upper divided body 6 having an opened lower surface is formed. The first male portion 2a of the above, the total wall lower edge of the upper split body 6 forming a box (joint portion between the lower split body 8)
Is formed at a position spaced a predetermined distance from the mold-splitting surface A, and the shape thereof is formed in a stepped manner, so that the outer peripheral wall of the upper divided body 6 is provided outside the lower edge of the peripheral wall. The joining groove portion 6a is formed in a continuous shape.

Meanwhile, the second cavity 9, is formed from a second female portion 1b for molding the outer surface shape of the lower split body 8, a second male part 2b for forming the inner shape of the lower split body 8 And a lower split body having a hat-shaped cross section in which a flange-shaped protrusion 8a is provided on the outer peripheral edge of the lower end by cooling and solidifying the molten resin between the second female mold portion 1b and the second female mold portion 2b. 8 is to be molded.

As shown in FIG. 2, the second female mold part 1b has a convex area formed in a convex shape on the mold cutting surface A of the fixed mold 1 and a mold of the fixed mold 1 in a continuous shape from the convex area. The split surface A has a concave region formed in a concave shape, the convex region forms a lower outer surface including the collar-shaped protrusion 8a of the lower divided body 8, and the concave region forms the upper surface of the lower divided body 8. It is adapted to mold the upper outer surface including. On the other hand, the second male portion 2b, corresponding to the second female portion 1b of the movable mold and concave regions formed in the concave parting surface A of the movable die 2, from the recessed area in a continuous shape 2 has a convex area formed on the molding surface A in a convex shape, and the concave area forms the lower outer surface including the collar-shaped protrusion 8a of the lower divided body 8, and the convex area is the lower divided body. The upper outer surface including the upper surface of 8 is molded.

In the second female mold portion 1b, the portion for molding the upper peripheral edge portion (joint portion with the upper divided body 6) of the lower divided body 8 having a hat-shaped cross section is from the mold dividing surface A. It is formed at a position spaced by a predetermined distance, and the shape thereof is formed stepwise so that the joining groove 8b can be formed in a continuous shape on the outer peripheral edge of the upper surface of the lower divided body 8. Has become.

The molding process of the hollow molded product by the fixed mold 1 and the movable mold 2 which compose the main mold in the above structure will be described below.

First, as shown in FIG. 1, the fixed mold 1 and the movable mold 2 are matched with each other with the opening / closing valve 5 opened. Next, the molten resin is injected and injected (primary injection) from the injection machine 10 to fill the molten resin into the first and second cavities 7 and 9 formed between the molds 1 and 2 described above. , The molten resin is cooled and solidified to form the upper and lower divided bodies 6.
8 is primarily molded.

Next, the upper divided body 6 molded in the above-mentioned first cavity 7 is attached to the first female die portion 1a of the fixed die 1, and
The lower split body 8 molded in the second cavity 9 is moved to the movable mold 2
Each is held by the second male portion 2b of, In this state,
The movable mold 2 is sequentially moved in each direction of mold opening, sliding upward, and mold clamping by a mold moving device (not shown). As a result, the lower edge portion of the entire peripheral wall of the upper divided body 6 and the outer peripheral edge portion of the upper surface of the lower divided body 8 are in a state of abutment as shown in FIG. The joining groove portion 6a of the body 6 and the joining groove portion 8b of the lower divided body 8 form a series of joining groove portions communicating with the hot runner 3.

Next, the injection machine 1 with the on-off valve 5 closed.
Secondary injection is performed by 0 to fill the joining groove formed by the joining groove 6a and the joining groove 8b with the molten resin as shown in FIG. Then, the molten resin filled in the joining groove portion is cooled and solidified to join the upper divided body 6 and the lower divided body 8 to form a hollow chamber R on the upper side as shown in FIG. Then, the (secondary) molding of the desired hollow molded product P in which the collar-shaped projection 8a is provided on the outer peripheral edge of the lower end is completed.

As described above, in the fixed mold 1 and the movable mold 2 which are the molds of this embodiment, the upper split body 6 and the lower split body 8 of the hollow molded product P are simultaneously molded by the primary injection, After that, movable type 2
By moving the above-mentioned divided bodies 6 and 8, the divided bodies 6 and 8 are overlapped, and in this state, the divided bodies 6 and 8 are joined to form a desired hollow molded product P.

By the way, the joint portions of the respective divided bodies 6 and 8 as described above are formed on the fixed mold 1 side at a predetermined distance from the mold dividing surface A, respectively. Therefore, the upper divided body 6 is
Like the conventional split body, the lower split body 8 is formed into a box shape with an open lower surface, while the lower split body 8 has a collar-shaped projection 8a on the outer peripheral edge of the lower end.
Can be formed into a hat-shaped cross section, and as a result, a hollow chamber R is formed on the upper side and a collar-shaped projection 8a is provided on the outer peripheral edge of the lower end so that the entire shape is a hat-shaped cross section. It enables the molding of product P.

Second Embodiment Another embodiment of the present invention will be described below with reference to FIGS. 6 to 8. Since the hollow molded product molded by the mold of the second embodiment is the same as that molded by the mold of the first embodiment, for convenience of description,
About each component which comprises a hollow molded article, the same code | symbol is added and FIG. 5 is used again.

As shown in FIG. 6, the mold according to this embodiment has a resin supply port 20a of the injection machine 20 as in the first embodiment.
And a movable die 12 capable of opening / closing in the left / right direction and sliding in the up / down direction, and configured as a die slide type die structure. The fixed mold 11 is formed with a sprue 14 having one end communicating with the resin supply port 20a of the injector 20 and the other end communicating with a runner 13 described later.

The fixed mold 11 and the movable mold 12 are
Each of them is designed to be fitted to each other around the mold-breaking surface A.
On the upper side of 12, a first cavity 17 for molding the upper divided body 6 obtained by vertically dividing the hollow molded product into two is formed, while on the lower side, for molding the lower divided body 8. The second cavity 19 is formed. The movable die 12 is formed with a runner 13 communicating with the above-mentioned sprue 14 on the way of the movable die 12.
Is connected to the cavities 17 and 19 at both ends thereof, so that the molten resin from the sprue 14 is transferred to the cavities 1 and 19.
It will be supplied on July 19th.

[0030] The first cavity 17 has a first female portion 11a formed concavely shaping the outer contour of the upper split body 6 to the mold parting plane A of the fixed mold 11, the mold split plane A of the movable die 12 And a first male mold part 12a which is formed in a convex shape to mold the inner surface shape of the upper divided body 6, and these first female mold parts 1 are formed.
1a and by the molten resin between the first male portion 12a is cooled and solidified, the lower surface is adapted to mold the upper split body 6 of the opened box-shaped. The first male part of the 12
In a, a portion forming the lower edge portion of the entire peripheral wall of the box-shaped upper divided body 6 (joint portion with the lower divided body 8) is formed at a position separated from the mold dividing surface A by a predetermined distance. At the same time, the joining groove 6a is formed in a continuous shape on the outer side of the lower edge of the entire peripheral wall of the upper divided body 6 by forming the stepped shape.

On the other hand, the second cavity 19 is fixed mold 11
A second female portion 11b for molding the outer surface shape of the lower split body 8 into the parting plane A is formed in a concave shape, is formed and a second male portion 12b for molding the inner surface shape of the lower split body 8 cage, these first by the molten resin is cooled and solidified with 2 female portion 11b and between the second male portion 12b, the lower end outer peripheral edge to the flange-shaped projecting portion 8a is provided cross-hat shaped lower split body 8 is to be molded.

In the second female mold portion 11b, the portion for molding the outer peripheral edge portion of the upper surface of the lower divided body 8 (joint portion with the upper divided body 6) having a hat-shaped cross section has a predetermined distance from the mold dividing surface A. Is formed at the position where the is placed, and the shape thereof is formed in a stepwise manner, so that the joining groove 8b is formed in a continuous shape on the outer peripheral edge of the upper surface of the lower divided body 8. .

[0033] The second male portion 12b is formed a recessed area formed in a concave shape on the parting surface A of the movable die 2, the convex parting plane A of the movable die 2 from the recessed area in a continuous shape A concave inner surface of the lower split body 8 including the collar-shaped projection 8a, and a convex area of the lower split body 8 including an upper surface of the lower split body 8. It has become.

Further, the fixed mold 11 of this embodiment has a second
A single convex portion 1 extending from the lower end of the female mold portion 11b to the mold dividing surface A
1c is formed, and the movable die 12 is provided with a concave portion 12c that fits with the lower end side of the convex portion 11c formed on the mold dividing surface A of the fixed die 11. As a result, the convex portion 11c of the second female mold portion 11b is, as shown in FIG.
A single grooved groove portion 8c is provided from to the collar-shaped protrusion 8a. On the other hand, the recess 12c of the second male portion 12b is by the movement of the movable die 12 associated with the secondary injection as described below, is disposed in communication with the other end of the sprue 14,
A runner for supplying the molten resin is configured.

The molding process of the hollow molded product by the fixed mold 11 and the movable mold 12 which compose the main mold in the above structure will be described below.

First, in a state where the fixed mold 11 and the movable mold 12 are aligned as shown in FIG. 6, a molten resin is injected and injected (primary injection) from the injection machine 20, and the sprue 14 and runner 13 are used. The molten resin is filled in both cavities 17 and 19, and then the molten resin is cooled and solidified to primarily mold the upper and lower divided bodies 6 and 8.

Next, the upper split body 6 molded in the first cavity 17 is placed on the first female mold portion 11a of the fixed mold 11.
Furthermore, the lower split body 8 which is molded into the second cavity 19 respectively are held in the second male portion 12b of the movable die 12, in this state, the movable mold by the mold moving device (not shown) 12
Is sequentially moved in each direction of mold opening, sliding upward, and mold clamping. At this time, the unnecessary resin portion cooled and solidified in the sprue 14 and the runner 13 is cut and removed manually or by an apparatus.

As a result, the lower edge of the entire peripheral wall of the upper divided body 6 and the outer peripheral edge of the upper surface of the lower divided body 8 are in an abutting state as shown in FIG. Further, in such an abutting portion, a series of joining groove portions is formed by the joining groove portions 6a of the upper divided body 6 and the joining groove portions 8b of the lower divided body 8. This joining groove portion is the groove portion 8c of the lower divided body 8.
And is in communication with the sprue 14 via the recess 12c of the movable die 12.

Next, the secondary injection is performed by the injection machine 10, so that the molten resin is passed through the sprue 14, the concave portion 12c of the movable die 12 and the groove portion 8c of the lower divided body 8 to the above-mentioned joining groove portion. Fill. Then, the molten resin filled in the joining groove portion is cooled and solidified to join the upper divided body 6 and the lower divided body 8 to form a hollow chamber R on the upper side as shown in FIG. And the collar-shaped projection 8a on the outer peripheral edge of the lower end.
The (secondary) molding of the desired hollow molded product P molded from is completed. In the joining of the upper divided body 6 and the lower divided body 8 as described above, the groove portion 8c of the lower divided body 8 forming the molten resin supply path is formed by cooling and solidifying the molten resin inside. ,
It is filled with a desired outer surface shape.

As described above, the fixed mold 11 and the movable mold 12, which are the molds of this embodiment, are similar to the molds 1 and 2 of the first embodiment and are molded on the hollow molded product P by primary injection. By simultaneously molding the divided body 6 and the lower divided body 8, and then moving the movable die 2 to overlap the divided bodies 6 and 8 described above, and by joining the divided bodies 6 and 8 in this state. It is possible to mold a hollow molded product P having a hat-shaped cross section as a whole.

By the way, the second female mold part 1 of the fixed mold 11
1b and, the second male portion 12b of the movable die 12, and the convex portion 11c and the recess 12c to be fitted to each other in the mold clamped state are respectively formed, the projecting portion 11c is lower split body 8
At the time of molding, one groove portion 8c is provided from the joining groove portion 8b of the lower divided body 8 to the flange-shaped protrusion portion 8a, while the recessed portion 12c constitutes a molten resin supply passage associated with the secondary injection. It is supposed to do.

Therefore, in the first embodiment, the hot runner 3 having the open / close valve 5 is provided so that the molten resin is not supplied to the second female mold portion 1b side of the fixed mold 1 during the secondary injection. However, in the second embodiment, the supply of the molten resin to the second female mold portion 1b side can be cut off without providing the on-off valve 5 and the hot runner 3, and as a result, the injection machine 20 Therefore, the structure of the supply passage (the sprue 14 and the runner 13) for supplying the molten resin to the cavities 17 and 19 can be simplified.

The first and second embodiments are not intended to limit the present invention, and various modifications can be made within the scope of the present invention. For example, the shape of the joining portion between the upper divided body 6 and the lower divided body 8 is not particularly limited, and as shown in FIG. 9, a joining groove portion 6a provided on the upper divided body 6 side,
By joining the joining projection 8d provided on the lower divided body 8 side, as shown in FIG. 10, the joining groove portion 8b provided on the lower divided body 8 side and the joining grooved portion 8b provided on the upper divided body 6 side. Protrusion 6 for joining
It is also possible to join with b.

[0044]

As described above, the molding die structure of the hollow molded article according to claim 1 of the present invention has the cavity between the fixed die and the movable die by the primary injection, and the first and the second of the hollow molded articles are formed .
After forming the bisected bodies, it is one of the first and second divided member
Is held fixed, the other is a state in which superimposed two divided members to each other by moving the <br/> movable die in a state held by the movable die, after which the two divided members by a secondary injection bonding to, a mold structure of the hollow molded article to form a hollow chamber between the two divided members, the first split body described above, the second divided member
The second divided body has a shape in which the joint side is opened , and
In the shape of a hat-shaped cross-section, a flange-shaped protrusion is formed on the outer peripheral edge of the end opposite to the end on the side of the joint with the split body ,
The bonding cavity by the secondary injection is movable with the fixed mold.
It is a structure formed on the fixed mold side with a predetermined distance from the mold split surface with the mold.

[0045] Accordingly, a first split body closer to the junction between the second divided body is opened, and the joint portion between the first divided body reaction
When forming secondary and second divided bodies flange-shaped projecting portions provided with cross-hat of the outer peripheral edge of the pair end, the flange-shaped projecting portion of the joint cavity or <br/> et second split side it is possible to prevent the inflow of molten resin into, as a result, have a hollow chamber
In addition, it is possible to mold a hollow molded product having a flange-shaped projection on one outer peripheral edge.

Therefore, in the case of forming a cylinder head cover having a baffle plate, the baffle plate can be integrally formed with the cover, so that the assembling work of the baffle plate can be eliminated and the productivity can be improved. The effect that improvement can be brought about is exhibited.

Further, the molding die structure of the hollow molded article according to claim 2 is the same as the molding die structure of the hollow molded article according to claim 1, in which the fixed mold is provided on the outer surface of the divided body by primary injection. protrusions for conditions set the groove strip portion are formed, also, the component
The groove portion of the split body serves as a supply path for supplying the molten resin to the bonding cavity at the time of secondary injection, and the molten resin is solidified to be embedded in a predetermined outer surface shape.

As a result, even when a hollow molded article having a hollow chamber and having a flange-shaped projection on one outer peripheral edge is formed, the melting is performed without providing a special device such as an on-off valve or a hot runner. The resin supply path can be simplified and the cost can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a die matching state during primary injection of a fixed die and a movable die according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a second female die portion formed on the fixed die and a second male die portion formed on the movable die.

FIG. 3 is a vertical cross-sectional view showing a die-matching state of the fixed die and the movable die during secondary injection.

FIG. 4 is a vertical cross-sectional view showing a state in which a molten resin is filled between the divided bodies that are primarily molded by the fixed mold and the movable mold.

FIG. 5 is a vertical cross-sectional view showing a hollow molded article formed by joining the above-mentioned divided bodies.

FIG. 6 is a vertical cross-sectional view showing a mold matching state during primary injection of a fixed mold and a movable mold according to another embodiment of the present invention.

FIG. 7 is a perspective view showing a lower divided body in which a grooved portion is formed by the fixed convex portion.

FIG. 8 is a vertical cross-sectional view showing a mold matching state of the fixed mold and the movable mold at the time of secondary injection.

FIG. 9 is a vertical cross-sectional view showing a hollow molded article in which a joining portion is provided near the upper divided body.

FIG. 10 is a vertical cross-sectional view showing a hollow molded article in which a joint portion is provided near the lower divided body.

[Explanation of symbols]

1 ・ 11 Fixed type 2 ・ 12 Movable type 6 Upper divided body (first divided body) 6a ・ 8b Joining groove portion 8 Lower divided body (second divided body) 8a Collar-shaped protrusion 8c Groove portion P Hollow molding Product R Hollow chamber

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Claims (2)

[Claims] 1. A key between a fixed mold and a movable mold by primary injection.
After molding the first and second divided bodies of the hollow molded product with a cavity, one of the first and second divided bodies is held by the fixed mold.
It is and the other is a state in which superimposed two divided members to each other by moving the movable die in a state held by the movable die, then joining the two divided members by a secondary injection, between the two divided bodies A structure for molding a hollow molded article in which a hollow chamber is formed in, wherein the first divided body has a shape in which a joint portion side with the second divided body is opened , and the second divided body is Joint with 1 division
The side edge portion flange-shaped projecting portion is formed at the outer peripheral edge portion of the opposite end has a shape that forms a cross-hat, in the secondary injection
A molding die structure for a hollow molded product, wherein the bonding cavity is formed on the fixed mold side at a predetermined distance from the mold split surface between the fixed mold and the movable mold . The method according to claim 2, wherein said fixed mold has convex portions condition set is formed a groove line portions on the outer surface of the divided body in the primary injection, The groove strip portion of the divided bodies, during the secondary injection , Cavite for bonding
2. The molding die structure for a hollow molded article according to claim 1, wherein the molten resin is solidified and filled into a predetermined outer surface shape while forming a supply path for supplying the molten resin to the base material.