JP3299428B2 - Injection molded article molding method and molding die - 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 method for molding an injection-molded product having a thickness of about 1 to 2 mm and having irregularities on at least one side using a liquid crystal polymer molding material, and a molding die therefor. For details, refer to MID (Molded
The present invention relates to a method and a mold for molding an injection-molded product to be a substrate of an interconnection device.

[0002]

2. Description of the Related Art A molding die A is formed by an upper die (not shown) and a lower die 1. The molding die A includes a sprue 2, a runner 3, a gate 4, a cavity, as shown in FIG. 5 is provided. Gate 4 is a thin and wide film gate 4
a. When a molten liquid crystal polymer molding material is injected into the sprue 2 from the injection molding machine in a state where the upper mold and the lower mold 1 are clamped, the molding material passes through the sprue 2, the runner 3 and the film gate 4 a to form the cavity 5. Is molded into a molded product 5 '. When the molded product 5 'is molded, a gate molded portion 4' is formed in the film gate 4a, a runner molded portion 3 'is formed in the runner 3, and a sprue molded portion 2' is formed in the sprue 2, and these are integrally connected. . Then, after molding the molded product 5 ', it is cooled in a mold-clamped state, and after cooling, the mold is opened to form the molded product 5'.
Is taken out together with the gate forming section 4 ', the runner forming section 3' and the sprue forming section 2 ', and after taking out, the gate forming section 4' is cut to form a molded product 5 'as shown in FIG. You. The surface of the molded product 5 'is provided with a number of square holes 6 recessed, and the surface is uneven.

[0003]

By the way, in the molding material of the liquid crystal polymer, the molecular chains have the flow direction (the direction of the arrow in FIG. 20 ).
It has excellent properties such as "has a self-reinforcing effect" and "good fluidity", but at the same time, "has a large anisotropy in molding shrinkage. Although the ratio becomes small, it has a large value in the direction perpendicular to the flow direction regardless of the thickness.)). For this reason, in the injection molding of plate-shaped molded products having different shapes on the front and back, the shrinkage of the thick runner molded portion 3 ′ and the distortion caused by the contraction mainly cause “the amount of warpage deformation of the molded product 5 ′. Problems such as "large" and "poor dimensional accuracy of molded article 5 '" occur after molding or in a post-process. That is, as shown in FIG. 21 , the molded product 5 ′ is warped by the dimension of T with respect to the surface plate 7 in a state where the molded product 5 ′ is placed on the surface plate 7. may be t. The molded article 5 'is an ideal that is molded into the shape shown in FIG. 22 (a), actually dimensional accuracy is poor is molded into a shape as shown in FIG. 22 (b).

Japanese Unexamined Patent Application Publication No. 7-40391 discloses a device for reducing the warpage of a molded product 5 'formed by using a liquid crystal polymer molding material. It cannot be reduced. This is the figure
As shown in FIG. 23 , two or more runners 3 are used, and the molding material is injected from the two or more runners 3 through the film gate 4a, thereby the orientation direction of the molecules and the orientation of the reinforcing material. The warpage can be reduced by making the direction, temperature distribution and pressure distribution uniform, and the warpage can be reduced as compared with the above-mentioned conventional example. There is a problem that the molded product 5 'is received and the molded product 5' is warped.

SUMMARY OF THE INVENTION The present invention has been made in view of the above description, and has as its object to obtain a molded product of a liquid crystal polymer having less warpage and good dimensional accuracy.

[0006]

The first aspect of the present invention for solving the above-mentioned problems is a method for molding an injection-molded article,
Using a mold having a sprue, runner, gate and cavity, a dummy is provided around the cavity when a molding material of liquid crystal polymer is injected into the cavity through the sprue, runner and gate to form a molded product. The resin is also filled in the portion, and the irregularities provided in the dummy portion are cut into the molding material, and shrinkage of the molded product is regulated by fixing the dummy portion. In this case, the dummy molded part formed in the dummy part is fixed to the dummy part of the mold, and the shrinkage of the molded product, which is a product, can be regulated to improve the dimensional accuracy of the molded product.

A method of molding an injection-molded article, which is a second feature of the present invention, is a method for molding a liquid crystal polymer molding material by using a molding die having a sprue, a runner, a gate and a cavity. The molding is performed such that a weld line parallel to the resin flow direction of the molding material when forming is formed by injecting into the cavity through the cavity and forming the molded product. In this case, since a weld line is formed in the molded product and the orientation of the liquid crystal polymer is divided, the residual stress in the entire molded product is reduced, and the warpage is reduced.

In a third aspect of the present invention, a method of molding an injection-molded article is provided by using a molding die having a sprue, a runner, a gate and a cavity to convert a liquid crystal polymer molding material into a sprue, a runner and a gate. Then, the molded product is injected into the cavity to form a molded product, and the molded product is corrected while the molding die is slightly opened during cooling in the molding die.
In this case, a distortion is given to the molded article during cooling by the molding die, and the distortion is offset with the distortion generated in the next step (such as heat treatment), so that the warpage of the final product can be reduced.

A molding die for an injection-molded article according to a fourth aspect of the present invention is used for the molding method according to the first aspect, and has a sprue, a runner, a gate and a cavity, and has a sprue and a runner. A molding die for injecting a liquid crystal polymer molding material into a cavity through a gate to form a molded product in the cavity, wherein the cavity is formed at an end of the cavity in a direction perpendicular to a direction in which the gate molding material flows. A dummy portion is provided on the mold so as to communicate with the mold, and the dummy portion is provided with irregularities. In this case, a dummy molded portion formed integrally with the end of the molded product, which is a product, can be fixed to the mold by the dummy portion of the mold, and the shrinkage of the molded product can be regulated to improve the dimensional accuracy of the molded product.

According to a fifth aspect of the present invention, there is provided a molding die for an injection-molded article which is used in a molding method according to the first aspect, and has a sprue, a runner, a gate and a cavity, and a sprue and a runner. A molding die for injecting a liquid crystal polymer molding material into a cavity through a gate to form a molded product in the cavity, and a dummy portion communicating with the cavity around the entire cavity except for the portion where the gate is located. And the dummy portion is provided with irregularities. In this case, a dummy molded portion formed integrally with the entire periphery of the end of the molded product as a product by the dummy portion of the mold can be fixed to the mold, and the dimensional accuracy of the molded product can be reduced by controlling the shrinkage of the molded product. Can be further improved.

According to a sixth aspect of the present invention, there is provided a molding die for an injection-molded article used in a molding method according to the second aspect, comprising a sprue, a runner, a gate and a cavity. A molding die that injects a liquid crystal polymer molding material into the cavity via the gate to form a molded product in the cavity.The liquid crystal polymer molding material is divided by a runner and merged again at the gate and cavity. An obstacle for forming a weld line in the molded product is provided on the runner. In this case, the flow of the molding material is divided by the obstacles of the runners, and a weld line is formed in the molded product, and the orientation of the liquid crystal polymer is divided, so that the residual stress in the entire molded product is reduced, and the warpage is reduced. You.

According to a seventh aspect of the present invention, there is provided a molding die for an injection-molded article according to the sixth aspect, wherein the obstruction has a triangular shape or a shell shape, and the obstruction is provided on the embedding pin. Is embedded in a molding die and attached. Also in this case, the flow of the molding material is dispersed by the triangular or shell-shaped obstacles of the runner, and a weld line is formed in the molded product, and the orientation of the liquid crystal polymer is divided. It is alleviated and warpage is reduced. In addition, since the embedding pin is embedded in the molding die, the obstacle can be easily and reliably attached because the obstacle is attached. Further, by changing the angle when embedding the embedding pin, the direction of the obstacle can be changed and the state in which a weld line can be formed can be changed.

An injection molding die according to an eighth aspect of the present invention is used for the molding method according to the second aspect, and has a sprue, a runner, a gate and a cavity, and has a sprue and a runner. A molding die for injecting a liquid crystal polymer molding material into a cavity through a gate to form a molded product in the cavity, wherein a plurality of the sprues and runners are used and the molded product is located at a position corresponding to a boundary of the runner. A weld line is formed on the substrate. In this case, a weld line is formed in the molded article by a plurality of sprues or runners, and the orientation of the liquid crystal polymer is divided, so that the residual stress in the entire molded article is reduced, and the warpage is reduced.

According to a ninth feature of the present invention, a molding die for an injection-molded article is used for a molding method according to a third feature, and includes a sprue, a runner, a gate and a cavity, and a sprue and a runner. A molding die for injecting a liquid crystal polymer molding material into a cavity through a gate to form a molded product in the cavity, wherein at least a portion of the upper mold and the lower mold corresponding to the cavity is divided into a plurality of parts. The mold is divided into molds, and each mold is urged by a spring so that the molds project toward the parting surface when the molds are opened. In this case, by slightly opening the mold during the cooling with the molding die, the molded product is distorted by the split mold urged by the spring, and is offset with the distortion generated in the next step (heat treatment, etc.). Product warpage can be reduced.

According to a tenth feature of the present invention, a molding die for an injection-molded article is used for a molding method according to a third feature, and has a sprue, a runner, a gate and a cavity, and has a sprue and a runner. A molding die for injecting a liquid crystal polymer molding material into a cavity through a gate to form a molded product in the cavity, wherein at least a portion of the upper mold and the lower mold corresponding to the cavity is divided into a plurality of parts. The mold is divided into molds, and each mold is urged by a cylinder device such as a hydraulic cylinder or an air cylinder so that the molds project toward the parting surface when the molds are opened. In this case, by slightly opening the mold during cooling by the molding die, the molded product is distorted by the split mold urged by the cylinder device, and is offset with the distortion generated in the next step (heat treatment or the like). Warpage of the final product can be reduced.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment corresponding to the first and fourth features of the present invention will be described.

The molding die A is formed by an upper die (not shown) and a lower die 1. As shown in FIG.
It has a runner 3, a film gate 4 a as a gate 4, and a cavity 5. The cavity 5 is formed in a shape for forming a molded product 5 'as a product having a number of square holes on the surface. A cutting blade 8 as a gate cutting means is arranged in the portion of the film gate 4a, and the cutting blade 8 can be driven up and down by a cylinder device 9. A liquid crystal polymer is used as a molding material, and specific product names are Vectra [manufactured by Polyplastics Co., Ltd.], Sumika Super [manufactured by Sumitomo Chemical Co., Ltd.], Zyder [Japan Petrochemical Co., Ltd.]. Then, when the molding die A is clamped and the injection molding machine injects a liquid crystal polymer molding material into the sprue 2, the molding material is filled into the cavity 5 via the sprue 2, the runner 3, and the film gate 4a, and molded. A molded product 5 'is formed from the material. At this time, a sprue forming portion 2 'is formed on the sprue 2, a runner forming portion 3' is formed on the runner 3, and a gate forming portion 4 'is formed on the film gate 4a.
After molding the molded product 5 ', the molded product 5' is cooled in a state where the molding die A is clamped. However, before the resin as the molding material is solidified (for example, the shrinkage of the resin is 10%). Make a gate cut below). This gate cut is cutting edge 8
Is driven by the cylinder device 9 as shown in FIG. 3 to cut the gate forming portion 4 '. Then, when the molded product 5 'is cooled to a predetermined temperature, the molding die A is opened and the molded product 5' is taken out. When the molding is performed in this manner, the gate molding portion 4 'separates the gate molding portion 4' and the molded product 5 'until the runner molding portion 3' and the gate molding portion 4 'increase in contraction. Transmission to a certain molded product 5 'can be prevented, and the warpage of the molded product 5' is reduced.
When molding as described above, for example, Vectra (trade name) was used as the molding material of the liquid crystal polymer. The mold temperature when this molding material was injected was 140 ° C., and the resin temperature of the molding material was 320 ° C. At this time, as a result of determining the warpage of the molded product 5 ′ due to the timing of performing the gate cut, the results are as shown in Table 1 below, and the shrinkage of the resin is 10%.
It can be seen that it is desirable to perform a gate cut below.

[0018]

[Table 1] In Table 1 in the resin shrinkage at the time i in the resin shrinkage, resin shrinkage _{= (L 0 -Li) / (} L 0 -Lsoli
d). Here, L ₀ is the length immediately after the injection of the resin as shown in FIG. 4, and Li is the length at a certain time point i.
d is the length when the resin is completely solidified.

As described above, the sprue 2, the runner 3, the film gate 4a, and the cavity 5 are provided in the molding die A. In the case of the present embodiment, as shown in FIG. At both ends in the direction perpendicular to the resin flow direction, dummy portions 13 communicating with the cavity 5 are provided. The dummy portion 13 has irregularities 12
, A pair of pins 12a are respectively protruded at intervals. Then, when the molding die A is clamped and the injection molding machine injects a liquid crystal polymer molding material into the sprue 2, the molding material is filled into the cavity 5 via the sprue 2, the runner 3, and the film gate 4a, and molded. Molded product 5 'with material
Is molded. At this time, a sprue forming portion 2 'is formed on the sprue 2, a runner forming portion 3' is formed on the runner 3, and a gate forming portion 4 'is formed on the film gate 4a. The molding material further filled in the cavity 5 is further filled in the dummy portion 13 to form a dummy molded portion 13 ', and the pin 12a bites into the dummy molded portion 13' to fix the dummy molded portion 13 '. After molding the molded product 5 ', the molded product 5' is cooled while the molding die A is clamped. The pin 12a bites into the dummy molded portion 13 'and the dummy molded portion 13' is fixed. Therefore, the molded product 5 'is prevented from to try to contract in the direction of the arrow in FIG. 6. Thus, when the molded product 5 'is cooled to a predetermined temperature and the molded product 5' is taken out, a molded product 5 'having high dimensional accuracy can be obtained.

Next, an embodiment corresponding to the first and fifth features of the present invention will be described.

In the case of this embodiment, as shown in FIG. 7 , a dummy portion 13 communicating with the cavity 5 is provided on the entire periphery of the cavity 5 except for a portion where the film gate 4a is located. Each dummy portion 13 has a pair of pins 12
a are protruded from each other at intervals. Also in this case, when the molding die A is clamped, the molding material of liquid crystal polymer is injected into the sprue 2 from the injection molding machine, and the molding material is filled into the cavity 5 through the sprue 2, the runner 3, and the film gate 4a. A molded product 5 ′ is molded in the cavity 5, while the molding material filled in the cavity 5 further includes a dummy portion 13.
To form a dummy molded portion 13 '.
a bites into the dummy molding portion 13 'and the dummy molding portion 1
3 'is fixed to prevent the molded product 5' from shrinking in the direction of the arrow in FIG. 6 when cooled. Thus, when the molded product 5 'is cooled to a predetermined temperature and the molded product 5' is taken out, a molded product 5 'having high dimensional accuracy can be obtained. In the case of this example, the dummy molded portion 13 'is provided around the entire circumference and fixed, so that a molded product 5' with higher dimensional accuracy can be obtained.

Next, an embodiment corresponding to the second and sixth features of the present invention will be described.

In the case of this example,FIG.Molding mold A as shown in
An obstacle 26 is provided substantially at the center of the runner 3. Heel
Obstacle 26FIG.Triangle like (a)FIG.
(B) It has a shell shape as shown in (c). Eventually
The mold A is clamped, and the liquid crystal is injected into the sprue 2 by the injection molding machine.
When the polymer molding material is injected, sprue 2, runner
3. Molding material cavity through film gate 4a
5, and a molded product 5 'is molded with the molding material.
However, when the liquid crystal polymer molding material passes through the runner 3,
When it is cut parallel to the flow direction by the obstacle 26,
Merging part for merging at the lum gate 4a and the cavity 5
In minutesFIG.A weld line 27 is formed as shown in FIG. This
In the case of, the flow of the molding material is divided by the obstacle 26 of the runner 3.
And a weld line 27 is formed on the molded product 5 '.
Since the orientation of the polymer is cut off, the residual over the entire molded product 5 '
The residual stress is reduced, and the warpage is reduced.

Next, an embodiment corresponding to the second and seventh features of the present invention will be described.

In the case of this embodiment, the cylindrical embedding pin 28 is
On the edgeFIG.Triangular as in (a) orFIG.
A bullet-like obstacle 26 as shown in FIG.
By embedding the embedding pin 28 in the molding die A,
The harmful substance 26 is mounted on the runner 3. Also embedded
Obstacle 2 by changing the direction to embed
So that the angle of 6 can be inclined with respect to the flow direction of the resin
It has become. Also in this case, the molding material of the liquid crystal polymer is
Parallel to the flow direction at the obstacle 26 when passing through the inner 3
And again at the film gate 4a and the cavity 5
A weld line 27 is formed at the junction to join
You. Then, the flow of the molding material occurs at the obstacle 26 of the runner 3.
Is divided into molded products 5 'As shown in FIG.Weld
Because the line 27 is formed and the alignment of the liquid crystal polymer is divided
The residual stress in the entire molded product 5 'is alleviated and warpage is reduced
Is done. Moreover, the angle when embedding the embedding pin 28 is
The direction of the obstacle 26 can be changed by changing
The state of the edge line 27 can be changed.

Next, an embodiment corresponding to the second and eighth features of the present invention will be described.

In the case of this example, as shown in FIG. 12, two sprues 2 and two runners 3 are provided in parallel, and the two runners 3 communicate with one film gate 4a and one cavity 5. In this case, the resins supplied from the two runners 3 join at the film gate 4a, and a weld line 27 is formed on the molded product 5 'along the joining boundary. Then, a weld line 27 is formed in the molded product 5 'by the plurality of sprues 2 and the runners 3 and the alignment of the liquid crystal polymer is divided, so that the residual stress in the entire molded product 5' is reduced and the warpage is reduced. .

Next, an embodiment corresponding to the third and ninth features of the present invention will be described.

In the case of this example, as shown in FIG.
A plurality of split dies 15a, 15b, 15b, 15c, 15c and split dies 1a, 1b, 1b, 1c, 1c are provided in a portion corresponding to the cavity 5 of the lower die 1 and the lower die 1, and the split dies 15a, 15b, 15b, 15c, 15c and split type 1
a, 1b, 1b, 1c and 1c are slidable in the vertical direction perpendicular to the parting surface. In addition, each split type 1
a, 1b, 1b, 1c, 1c are springs 30a, 30b, 3
0b, 30c, and 30c are biased in a protruding direction, and each of the split dies 15a, 15b, 15b, 15c, and 15c
Are urged by springs 31a, 31b, 31b, 31c, 31c in the protruding direction. Springs 30a, 30b, 30
c and the springs of the springs 31a, 31b, 31c are as follows: spring 30a> spring 31a, spring 30b> spring 31b, spring 3
0c> spring 31c, and spring 30a> spring 30b
> Spring 30c, spring 31a> spring 31b> spring 3
1c. After the step of injecting a molding material made of a liquid crystal polymer into the cavity 5 through the sprue 2, the runner 3, and the film gate 4a to fill the molding material A with the molding material is completed, FIG. Open the small mold as shown. Here, S is the mold opening amount, which is the same as the maximum warpage amount of the molded product 5 '. When the mold is cooled in the open state, the springs 30a, 30b, 30c, 31a, 31
b, 31c, split type, 1a, 1b, 1c, 1
While being pressed at 5a, 15b, and 15c, it is corrected so as to be warped. When the cooling is completed, the mold is opened and the molded product 5 'is taken out. Then, the warpage of the molded product 5' is measured and sent to the next step. Data obtained by measuring the warpage of the molded product 5 'is fed back as a mold opening amount in the next molding. By the way, conventionally, as shown in FIG. 15B, a molding material made of a liquid crystal polymer is charged into a molding die A, cooled in a mold-clamped state, cooled, opened, and a molded product 5 'is taken out. Was sent to the next process. Therefore, as shown in FIG. 14B, after the molded product 5 'is processed in the next step (such as heat treatment), there is a problem that the molded product 5' is greatly warped. However, in the case of the present invention, a strain is applied to the molded product 5 'during cooling by the molding die A, and the strain is offset with the distortion generated in the next step (heat treatment or the like), so that the final product as shown in FIG. Warpage of the product can be reduced. In the case of this example,
Pressing is performed while the mold is slightly opened to give a warp, and a measured value of the warp is fed back to set a mold opening amount.

Next, an embodiment corresponding to the third and tenth features of the present invention will be described.

This embodiment is also basically the same as the embodiment shown in FIG. 13 except that the springs 30a, 30b, 30c, 31a,
Instead of 31b and 31c, cylinder devices 32a, 32b, such as hydraulic cylinders and air cylinders, as shown in FIG.
The difference is that 32c, 33a, 33b, and 33c are used. In this case, the cylinder devices 32a, 32b, 32c,
The pressure intensities of 33a, 33b, 33c are as follows: cylinder device 32a> cylinder device 33a, cylinder device 32b> cylinder device 33b, cylinder device 32c> cylinder device 33c, and cylinder device 32a> cylinder device 32b> cylinder device 32c. And the cylinder device 33
a> cylinder device 33b> cylinder device 33c.
Then, as shown in the flowchart of FIG.
Cavity 5 via runner 3 and film gate 4a
After the step of injecting a molding material composed of a liquid crystal polymer into the molding die A and injecting the molding material into the molding die A, a small amount of the die is opened.
As described above, when the mold is opened and cooled, the split molds 1a, 1b, 1c, 15a, and 15 are biased by the cylinder devices 32a, 32b, 32c, 33a, 33b, and 33c.
While being pressed by b and 15c, it is corrected so as to be warped. When the cooling is completed, the mold is opened and the molded product 5 'is taken out. Then, the warpage of the molded product 5' is measured and sent to the next step. The data obtained by measuring the warpage of the molded product 5 'are stored in the cylinder devices 32a, 32b, 32c, 33a,
It is fed back as an increase or decrease in the pressure strength of 33b, 33c, and increases or decreases the maximum warpage given to the molded product 5 'during cooling. Also in this case, distortion is given to the molded product 5 ′ while being cooled by the molding die A, thereby canceling the distortion generated in the next step (such as heat treatment), and the warpage of the final product can be reduced.
Further, in the case of this example, the molded product 5 'having a stable amount of warpage is formed by pressing in a slightly opened state to give a warp and setting a pressure for giving the warp by feeding back a measured value of the warp. Removed from type A.

[0032]

According to the first aspect of the present invention , a sprue,
Using a molding die having a runner, gate and cavity, a molding material of liquid crystal polymer is injected into the cavity through the sprue, runner and gate to form a molded product. Also, the resin is filled and the irregularities provided in the dummy part are cut into the molding material, and shrinkage of the molded product is regulated by fixing the dummy part, so the dummy molded part formed in the dummy part is the dummy part of the mold. To improve the dimensional accuracy of the molded product by controlling the shrinkage of the molded product.

According to a second aspect of the present invention, a molding material having a liquid crystal polymer is formed by using a sprue, a runner, a molding die having a gate and a cavity.
Injecting into the cavity through the gate to form a molded product and molding so as to form a weld line parallel to the resin flow direction of the molding material when molding, so that a weld line is formed in the molded product Since the orientation of the liquid crystal polymer is divided, the residual stress in the entire molded article is reduced, and the warpage is reduced.

According to a third aspect of the present invention, a molding material having a liquid crystal polymer is formed by using a molding die having a sprue, a runner, a gate and a cavity.
Injected into the cavity through the gate to form a molded product,
Since the molded product is straightened while the molding die is slightly opened during cooling in the molding die, the molded product is distorted during cooling by the molding die, and the distortion generated in the next process (heat treatment, etc.) It can offset and reduce the warpage of the final product.

According to a fourth aspect of the present invention, a dummy portion is provided in a mold so as to communicate with the cavity at an end of the cavity in a direction perpendicular to the direction in which the molding material of the gate flows. Since it is provided, the dummy molded portion formed integrally with the end of the molded product as the product can be fixed to the mold with the dummy portion of the mold, and the dimensional accuracy of the molded product can be improved by controlling the shrinkage of the molded product. Things.

According to the invention of claim 5 of the present invention, since a dummy portion communicating with the cavity is provided on the entire periphery of the cavity except for the portion where the gate is located, and the dummy portion is provided with irregularities, the dummy portion of the mold is used for the product. A dummy molded part integrally formed on the entire periphery of the end of the molded product can be fixed to the mold, and the dimensional accuracy of the molded product can be further improved by controlling the shrinkage of the molded product.

According to a sixth aspect of the present invention, a sprue, a runner, a gate and a cavity are provided.
A molding die that injects a liquid crystal polymer molding material into the cavity through the runner and gate to form a molded product in the cavity. Since the runner is provided with obstacles for forming weld lines in the molded product by merging, the flow of the molding material is dispersed by the obstacles of the runner, and a weld line is formed in the molded product, and the orientation of the liquid crystal polymer is adjusted. Due to the division, the residual stress in the entire molded article is reduced, and the warpage is reduced.

The invention of claim 7 of the present invention provides the method of claim 6
In the above, the obstacle is triangular or shell-shaped, and this obstacle is provided in the embedding pin, and the embedding pin is embedded in the molding die, so that the flow of the molding material is caused by the triangular or shell-shaped obstacle of the runner. Is broken and a weld line is formed in the molded product, and the orientation of the liquid crystal polymer is divided, so that the residual stress in the entire molded product is alleviated and the warpage is reduced. The obstacle can be easily and securely attached to the obstacle by embedding it in the hole, and the direction of the obstacle can be changed by changing the angle when embedding the embedding pin, and a weld line can be formed. It can change the state.

The invention according to claim 8 of the present invention has a sprue, a runner, a gate and a cavity.
A molding die that injects a liquid crystal polymer molding material into the cavity through the runner and gate to form a molded product in the cavity, and forms a plurality of sprues and runners at a position corresponding to the boundary of the runner. Weld lines are formed on the product, so that multiple sprues and runners form a weld line and the orientation of the liquid crystal polymer is divided, so the residual stress in the entire molded product is relaxed and warped. Is reduced.

According to a ninth aspect of the present invention, a sprue, a runner, a gate and a cavity are provided.
A molding die for injecting a liquid crystal polymer molding material into a cavity through a runner and a gate to form a molded product in the cavity, wherein at least a portion of the upper mold and the lower mold corresponding to the cavity is formed by a plurality of molds. The mold is divided into split molds, and each split mold is urged by a spring to allow the split mold to protrude toward the parting surface when the mold is opened. The molded product is distorted by a split mold biased by a spring, and is offset by distortion generated in the next step (such as heat treatment), so that warpage of the final product can be reduced.

According to a tenth aspect of the present invention, there is provided a sprue, a runner, a gate and a cavity.
A molding die for injecting a liquid crystal polymer molding material into a cavity through a runner and a gate to form a molded product in the cavity, wherein at least a portion of the upper mold and the lower mold corresponding to the cavity is formed by a plurality of molds. It is divided into split molds, and each split mold is urged by a cylinder device such as a hydraulic cylinder or air cylinder so that when the mold is opened, the split mold protrudes toward the parting surface. By slightly opening the mold during the process, the molded product is distorted by the split mold urged by the cylinder device, offsetting the distortion generated in the next process (heat treatment etc.), and reducing the final product warpage You can do it.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a part X in FIG.

FIGS. 3A and 3B are explanatory views illustrating the movement of a cutting blade during gate cutting.

FIG. 4 is an explanatory diagram illustrating a resin shrinkage degree according to the first embodiment.

FIG. 5 is an implementation corresponding to the first feature and the fourth feature of the above .
It is a perspective view which shows the form.

FIG. 6 is a perspective view for explaining a direction in which the molding shrinks.
is there.

FIG. 7 is an implementation corresponding to the first feature and the fifth feature of the above .
It is a perspective view which shows the form.

FIG. 8 is an embodiment corresponding to the second and sixth features of the above;
FIG.

9 (a), 9 (b) and 9 (c) are planes showing obstacles of the above.
FIG.

FIG. 10 is an embodiment corresponding to the second and seventh features of the above .
It is a top view showing a state.

11 (a) and 11 (b) are perspective views of an embedding pin according to the embodiment.
It is.

FIG. 12 is an embodiment corresponding to the second and eighth features of the above .
It is a top view showing a state.

FIG. 13 shows an embodiment corresponding to the third and ninth features of the above .
3A is a cross-sectional view of a molding die portion in a state, and FIG.
(B) is a press cooling step.

FIG. 14 is a view for explaining the warpage according to the first embodiment.
(B) is an explanatory view of a conventional example.

FIG. 15 shows a molding flowchart of the above, and (a)
Is a flowchart of the present invention, and (b) is a flowchart of a conventional example.
It is a chart.

FIG. 16 is an embodiment corresponding to the third and tenth features of the above .
It is sectional drawing of the shaping | molding die part which shows a form.

FIG. 17 is a flowchart of the molding process.

FIG. 18 is a perspective view illustrating a conventional example.

FIG. 19 is a perspective view illustrating a gate cut of the above.
You.

FIG. 20 is a perspective view illustrating a flowing direction of the resin according to the first embodiment.
It is.

FIG. 21 is a perspective view for explaining the warpage of the molded product of the above.
You.

22 (a) and 22 (b) are oblique views explaining dimensional accuracy of the above.
FIG.

FIG. 23 is a perspective view illustrating another conventional example.

[Explanation of symbols]

 A Mold 1 Lower mold 2 Sprue 2 'Sprue forming section 3 Runner 3' Runner forming section 4 Gate 4a Film gate 4 'Gate forming section 5 Cavity 5' Molded product 8 Cutting blade 10 Press forming apparatus 10a Upper press mold 10b Lower press die 13 Dummy part 13 'Dummy molding part 15 Upper die 26 Obstacle 27 Weld line 28 Embedded pin

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroyuki Yoshida 1048 Odomo Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. (56) References JP-A-7-40391 (JP, A) JP-A-5-217656 ( JP, A) JP-A-6-204273 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 45/00-45/38

Claims (10)

(57) [Claims] 1. Sprues, runners, gates and cavities
The molding material of the liquid crystal polymer is
Inject into cavity via sprue, runner, gate
Around the cavity when forming
Fill the dummy part with resin and set it in the dummy part.
The unevenness of the digging into the molding material causes the molded product to shrink.
A method for molding an injection-molded article, wherein the molding is regulated by fixing a dummy portion . 2. Sprues, runners, gates and cavities.
The molding material of the liquid crystal polymer is
Inject into cavity via sprue, runner, gate
Of the molding material when forming
Form a weld line parallel to the resin flow direction on the molded product
A method for molding an injection-molded article, characterized in that the molding is performed in such a manner as to be performed as described above. 3. Sprues, runners, gates and cavities.
The molding material of the liquid crystal polymer is
Inject into cavity via sprue, runner, gate
To form a molded product, and cool the molding die during cooling in the molding die.
A method of molding an injection-molded article, wherein the molded article is straightened in a slightly opened state . 4. Sprues, runners, gates and cavities
Cavities through sprues, runners and gates
Inject molding compound of liquid crystal polymer into cavity and into cavity
A molding die for forming a molded product, the molding material for the gate
At the end of the cavity perpendicular to the direction of flow
A dummy part is provided on the mold to communicate with the
Molded metal for injection molded products characterized by having irregularities on the part
Type. 5. A sprue, runner, gate or cavite.
Cavities through sprues, runners and gates
Inject molding compound of liquid crystal polymer into cavity and into cavity
The part where the gate is located in the molding die that forms the molded product
Dummy communicating with the cavity all around the cavity except for
Part, and the dummy part is provided with irregularities.
Molds for out-molded products . 6. A sprue, a runner, a gate and a cavity.
Cavities through sprues, runners and gates
Inject molding compound of liquid crystal polymer into cavity and into cavity
A molding die for forming molded products, which is used to mold liquid crystal polymers.
Cut the material with a runner and combine again with gates and cavities.
Obstacles for forming a weld line in the molded article by flowing
A molding die for an injection-molded article, characterized in that an object is provided on a runner . 7. The obstacle is triangular or bullet-shaped,
This obstacle is provided on the embedded pin and the embedded pin
That is embedded in the mold and attached
7. A molding die for an injection-molded article according to claim 6 . 8. A sprue, a runner, a gate and a cavity.
Cavities through sprues, runners and gates
Inject molding compound of liquid crystal polymer into cavity and into cavity
A molding die for forming a molded product, wherein the sprue or
Multiple runners at the position corresponding to the boundary of the runner
A special feature is that weld lines are formed on molded products.
Molding die of an injection molded article according to symptoms. 9. A sprue, a runner, a gate and a cavity.
Cavities through sprues, runners and gates
Inject molding compound of liquid crystal polymer into cavity and into cavity
A molding die for forming a molded product, comprising an upper die and a lower die
At least the part corresponding to the cavity is divided into multiple molds
And split each mold with a spring.
The split mold is made to protrude toward the parting surface.
And a molding die for an injection molded product. 10. A sprue, runner, gate or cabinet.
Cavities through sprues, runners and gates
Inject the liquid crystal polymer molding material into the
A molding die for forming a molded product on an upper die and a lower die
Dividing at least the part of the mold corresponding to the cavity
Molds, and each divided mold has its own hydraulic cylinder or air series.
When the mold is opened, the split mold is
It is characterized by projecting to the parting surface side
Molding die of an injection molded article to.