JPH0615658A - Resin molding and coating equipment - Google Patents

Abstract

PURPOSE:To prevent the collapse of a tip end of a plug member by a method wherein a coating material injection member provided in one mold is inserted into a molded piece, an auxiliary mold is internally provided in the other mold so as not to abut on the tip open end of an injection hole, and the retractable plug is internally provided in the injection hole. CONSTITUTION:An injection member 6 internally provided with a coating material injection hole 6c is provided in an upper mold 3 so as to be inserted into a molded piece 1. An auxiliary mold 7 is internally provided in a lower mold 4 opposedly to the injection member 6 so as not to abut on the tip open end of the injection hole 6c. A plug member 6b is internally provided in the injection hole 6c so as to move forward and backward through the injection hole 6c. When the molded piece 1 is formed by clamping in the nearly contact state of a tip end 6e of the injection member 6 with the auxiliary mold 7, a thin flash part 12 is formed between the tip end 6e and an upper surface 7a of the auxiliary mold 7. When a coating material is injected through the injection hole 6c after a clamping force is reduced and the plug member 6b is retracted from the auxiliary mold 7, the thin flash 12 is broken by the injection pressure, and the coating material is injected between the lower surface of the molded piece 1 and the upper surface of the lower mold 4. Therefore, the tip end of the plug does not collapse.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molding and coating apparatus for forming a resin molded product having a predetermined shape using a split mold and for forming a coating layer on one side of the molded resin molded product. Is.

[0002]

2. Description of the Related Art When molding a thermosetting resin bathtub or panel, a synthetic resin coating layer is sometimes formed on one side of the bathtub or panel, for example, on the inner side of a bathtub. For example, a method called an in-mold coating method is known.

This method uses a pair of split molds (generally composed of a male mold and a female mold) consisting of a fixed mold and a movable mold, and a lump or sheet-shaped resin molding material (B) between them.
After placing a molding material composed of MC, SMC, etc., mold clamping, heating and pressurizing to make a resin molded product of a predetermined shape, then flowing between one side surface of this resin molded product and the mold surface It consists of the process of injecting a functional coating material and coating on the surface of the molded product. Besides the advantage that molding and coating are performed in the same equipment and in a series of processes, the surface is beautifully coated and smoothed. There is an advantage that an excellent resin molded product can be obtained.

As a conventional device for performing such molding,
For example, there are those shown in FIGS. 12 and 1
3 is a partial cross-sectional explanatory view showing an operation procedure of this apparatus, in which the upper mold 3A is a movable mold and the lower mold 4A is a fixed mold.

A coating material injection member 5 is provided at the center of the lower mold 4A.
A is provided, and this member 5A has a plug member 5B built therein such that the plug member 5B can freely move forward and backward, and when the tip portion 5a of the member 5A is molded into a resin molded product 1A with a block-shaped or sheet-shaped resin molding material, the inner surface 3a of the upper mold 3A is formed. Is abutted against.

Then, as shown in FIG. 12, a resin molded product A
At the time of molding, the above-mentioned plug member 5B is advanced to the tip portion 5a of the coating material injecting member 5A, and the coating material injecting member 5A is in a nozzle closed state to perform compression molding of the molding material.

Next, as shown in FIG. 13, the mold clamping pressure of the upper mold 3A is relaxed and raised (at this time, the resin molded product A
The curing reaction is not completed), a space A is formed between the lower surface of the upper mold 3A and the resin molded product 1A, and the plug member 5B is retracted to the inner part of the coating material injection member 5A and the discharge port is discharged. After being opened, the fluid coating material 2 is injected into this space A.

Therefore, according to the above apparatus, the resin molded product 1
Since the coating material 2 can be injected from the back surface 1a side (upper side in the figure) of A, the coated surface of the resin molded product 1A can be formed with a uniform and beautiful appearance.

However, in the molding by the above apparatus, when the upper mold 3A and the lower mold 4A are clamped, the mold clamping pressure causes the tip 5a of the coating material injection member 5A and the tip of the plug member 5B. Since both 5b are pressed against the inner surface 3a of the upper mold 3A, the tip 5a of the coating material injection member 5A is crushed and opened inward and outward, or the tip 5b of the plug member 5B is opened outward. Calyx-shaped part may occur.

The formation of such calyx-shaped portions causes the coating material injection member 5A to move to the plug member 5B.
However, there is a problem in that it becomes impossible to inject the fluid coating material 2 and the molding is hindered. In addition, the sliding operation of the plug member 5B may be so large that the molding operation becomes very difficult even if the molding cannot be performed.

[0011]

The present invention has been made in view of the above circumstances, and the coating material injection member and the plug member do not come into contact with the inner surface of one of the split molds. The tip of the coating material injection member and the plug member is not crushed to form a calyx-shaped portion, which allows the plug member to be smoothly withdrawn from the coating material injection member, An object of the present invention is to provide a resin molding coating apparatus which can favorably perform molding without impeding the injection of the fluid coating material.

[0012]

In order to achieve the above object, the present invention has a structure according to claim 1 in which a coating layer is formed on one surface side of a resin molded product molded using a split mold. In the above apparatus, one of the split molds is provided with a coating material injecting member having a coating material injecting hole therein and an end face opened so as to be inserted into the resin molded product, and In the mold, an auxiliary mold facing the coating material injection member and not in contact with the tip opening of the coating material injection hole is provided, and in the injection hole of the coating material injection member,
A plug member that penetrates the injection hole and moves back and forth is internally provided.

Further, according to a second aspect of the present invention, the auxiliary die is internally removably installed in the other die.

Further, according to a third aspect of the present invention, the outer peripheral surface of the distal end of the coating material injecting member is formed with a tapered taper at a portion contacting the resin molded product. Moreover, as the structure according to claim 4, the tip of the coating material injection member inserted into the resin molded product formed by the split mold is close to the auxiliary mold without penetrating the resin molded product. The resin-molded product is formed with a thin flash portion.

According to a fifth aspect of the present invention, in the auxiliary mold, the coating material injected from the coating material injection hole of the coating material injection member breaks the thin flash-shaped portion of the resin molded product to form a resin. A concave umbilicus portion into which the separated thin flash-shaped portion of the resin molded product enters when injected into one surface side of the molded product is formed.

[0016]

According to the structure of the first aspect of the present invention, the auxiliary mold provided inside the other mold faces the coating material injection member, but at the tip opening of the coating material injection hole of this coating material injection member. Do not contact each other, the tip of the coating material injection member simply presses the molding material even if the molding material for molding the resin molded product is loaded into the split mold and clamped with high pressure. Therefore, as described in the section of the prior art, the tip portion is not crushed to form a calyx-shaped portion.

As a result, not only the plug member can be withdrawn from the coating material injecting member, but also the advancing / retreating operation can be smoothly performed many times after that without any hindrance, and good molding can be performed.

Further, according to the second aspect of the present invention, since the auxiliary mold can be retracted and the coating material can be injected, the injection of the coating material into the space remaining after the auxiliary mold is retracted. Since the resistance is relatively low, the resin molded product can be smoothly injected into one side.

Further, according to the third aspect of the present invention, since the outer peripheral surface of the distal end of the coating material injection member is formed in a tapered shape, the resin molded product is beginning to become slightly hard although it is uncured. It is possible to easily insert the tip of the coating material injecting member against the coating material injecting member, and the contact surface of the resin molded product can be easily inserted by the pressure of the injecting coating material. It is pressed against the contact part side,
It is possible to prevent the coating material from entering the other surface side of the resin molded product.

Further, according to the structure of claim 4,
Since the tip of the coating material injection member approaches the auxiliary mold without penetrating the resin molded product and forms a thin flash-shaped portion on the resin molded product, when the coating material is injected, Due to the injection pressure, the thin flash-shaped portion of the resin molded product is broken, and this coating material is injected into one side of the resin molded product.

Further, according to the structure of the fourth aspect, since the thin flash-shaped portion separated by the injection of the coating material enters into the concave navel formed in the auxiliary mold, one side of the resin molded product is formed. With the injected coating material, the flash shaped portion will not be carried to any of the surface of the part and will contaminate the surface. The thin flash-shaped portion that has entered the concave navel may be removed after the mold is opened.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a resin molding coating apparatus according to the present invention will be described below with reference to the drawings. 1 is a partial cross-sectional view showing a first embodiment of a resin molding coating apparatus according to the present invention during mold clamping, and FIG. 2 is a partial cross-sectional view showing a state in which an auxiliary mold is retracted from the state of FIG. 1, FIG. 1 is an enlarged cross-sectional view of the main part in the state of FIG. 1, FIG. 4 is an enlarged cross-sectional view of the main part in the state of FIG. 2, and FIG. 5 is a view when the split mold is loosened and the coating material is injected from the state of FIG. It is an expanded sectional view showing a state.

The resin molding coating apparatus S according to the present invention uses a split mold consisting of an upper mold 3 and a lower mold 4 to inject the coating material 2 on the lower surface 11 side of the resin molded product 1 molded between them. To form the coating layer 2A.

Then, in the upper die 3 of the split mold, a coating material injection member 6 having a coating material injection hole 6c provided therein and having a front end surface opened is inserted into the resin molded product 1 described above. And the lower mold 4 is internally provided with an auxiliary mold 7 facing the coating material injection member 6 and not in contact with the tip end opening 6d of the coating material injection hole 6c. Inside the injection hole 6c of 6, there is provided a plug member 6b which penetrates the injection hole 6c and advances and retreats. However, this plug member 6b does not penetrate the injection member 6 and its tip does not contact the auxiliary mold 7.

The auxiliary mold 7 is internally removably installed in the through hole 41 provided in the lower mold 4. Further, the tip outer peripheral surface 61 of the coating material injecting member 6 is formed with a tapered taper at a portion contacting the resin molded product 1.

Moreover, the tip portion 6e of the coating material injection member 6 inserted into the resin molded product 1 formed by the above-mentioned split mold including the upper mold 3 and the lower mold 4 penetrates the resin molded product 1. Close to the auxiliary mold 7 without
A thin flash-shaped portion 12 is formed on the upper surface.

Next, the resin molding coating apparatus S according to the present invention.
The operation sequence of will be described. First, a resin molding material such as SMC is set with the upper mold 3 and the lower mold 4 opened.

At this time, as shown in FIGS. 1 and 3, the upper surface 7a of the auxiliary mold 7 is made substantially flush with the upper surface 4a of the lower mold 4, and the tip portion 6e of the injection member 6 is The upper mold 3 and the lower mold 4 are clamped to form the resin molded product 1 in a state in which the auxiliary mold 7 is close to the auxiliary mold 7 without coming into contact therewith.

At this time, the injection member 6 is attached to the resin molded product 1.
A thin flash-shaped portion 12 is formed between the tip portion 6e of the above and the upper surface 7a of the auxiliary mold 7. Next, the mold clamping pressures of the upper mold 3 and the lower mold 4 are relaxed, and as shown in FIGS. 2 and 4, the auxiliary mold 7 is retracted to form a space B, and the plug member 6b is retracted upward to cover it. Coating material injection hole 6c of the material injection member 6
The coating material 2 is injected at a predetermined pressure.

Then, as shown in FIG. 5, the above-mentioned thin flash-shaped portion 12 of the resin molded product 1 is broken by the injection pressure of the coating material 2, and the coating material 2 is injected from this part and the resin molded product 1 of the resin molded product 1 is injected. The coating layer 2A is formed between the lower surface and the upper surface of the lower mold. It should be noted that one portion 21 corresponding to the surplus portion is sufficient, so, for example, when manufacturing a bathtub or the like, the portion 21 corresponding to the surplus portion is cut in a drainage port or the like in a later step. You can use it.

As described above, the auxiliary mold 7 provided in the lower mold 4 faces the coating material injection member 6 and is in contact with the tip opening 6d of the coating material injection hole 6c of the coating material injection member 6. Therefore, when the molding material for molding the resin molded product 1 is clamped and molded by the split mold, the tip portion 6e of the coating material injection member 6 is not crushed and a calyx-shaped portion is not generated. .

As a result, the plug member 6b can be smoothly withdrawn from the coating material injecting member 6 and the advancing / retreating operation after that can be smoothly carried out, and the molding can be satisfactorily performed.
Further, since the auxiliary mold 7 can be retracted and the coating material 2 can be injected, the resin material 1 is once injected with the coating material 2 in the space B that remains after the auxiliary mold 7 is retracted.
Since it is injected into the lower surface 11 side, the injection of the coating material 2 is smoothly performed.

Further, the tip outer peripheral surface 6 of the coating material injection member 6
Since 1 is formed in a tapered shape, the resin molded product 1
The tip portion 6e of the coating material injecting member 6 can be easily inserted into the cover material injection member 6 and the contact surface 14 of the resin molded product 1 is caused to inject the coating material by the pressure of the injected coating material 2. It is possible to prevent the coating material 2 from being pressed toward the contact portion side of the member 6 and from entering the upper surface side of the resin molded product 1.

Next, the resin molding coating apparatus S of the second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is an enlarged cross-sectional view of an essential part of the resin molding coating apparatus of the second embodiment during mold clamping, and FIG. 7 is an enlarged cross-sectional view of an essential part showing a state in which the auxiliary mold is retracted from the state of FIG. FIG. 8 is an enlarged cross-sectional view showing a state where the split mold is loosened and the coating material is injected from the state of FIG. 7.

The resin molding coating apparatus S of the second embodiment
In the resin molding coating apparatus S of the first embodiment described above, the coating material 2 injected into the auxiliary mold 7 through the coating material injection hole 6c of the coating material injection member 6 is the resin molded article 1 described above. The lower surface 11 of the resin molded product 1 by breaking the thin flash portion 12
When the resin molding 1 is injected into the side, the concave umbilicus 71 into which the separated thin flash-shaped portion 12 of the resin molding 1 enters is formed.

The concave umbilicus portion 71 is formed of a front surface side umbilicus portion 71a having an arcuate cross section and a female screw shaped portion 71b connected to the front surface side umbilicus portion 71a. The operation sequence of the resin molding coating apparatus S of the second embodiment will be briefly described. As shown in FIG. 6, when the upper mold 3 and the lower mold 4 are clamped, a part 13 of the resin molded product 1 is recessed. Enter the navel 71.

Then, as shown in FIG. 7, when the auxiliary mold 7 is retracted, the portion 13 that has entered the concave umbilicus 71 is torn and retracted together with the concave umbilicus 71. Next, as shown in FIG. 8, when the coating material 2 is injected, the injection pressure causes the thin flash-shaped portion 12 of the resin molded product 1 described above.
Are separated and pressed into the concave navel 71.

As a result, the lower surface 1 of the resin molded product 1
This flash-shaped portion 1 in the coating material 2 injected on one side
2 does not remain. Next, a resin molding coating apparatus S of a third embodiment of the present invention will be described based on FIGS. 9 to 11.

FIG. 9 is an enlarged sectional view of an essential part of the resin molding coating apparatus of the third embodiment during mold clamping, and FIG. 10 is an enlarged sectional view of an essential part showing a state in which the auxiliary mold is retracted from the state of FIG. Figure, Figure 1
FIG. 1 is an enlarged cross-sectional view showing a state where the split mold is loosened from the state of FIG. 10 and the coating material is injected.

The resin molding coating apparatus S of the third embodiment
The outer peripheral surface 61 of the tip of the coating material injecting member 6 which is a portion in contact with the resin molded product 1 is tapered with a convex curved surface having an arbitrary curvature. Therefore, the contact surface 14 of the resin molded product 1 facing the tip outer peripheral surface 61 of the coating material injection member 6 is firmly attached to the tip outer peripheral surface 61, and it is possible to reliably prevent the coating material 2 from leaking to an unnecessary portion. .

[0041]

Since the present invention is constituted as described above, the coating material injection member and the plug member do not come into contact with the inner surface of one of the split molds, and the coating material for these members is not provided. There is no possibility that the calyx-shaped portions will be formed due to the tip end portions of the injection member and the plug member being crushed. Therefore, it is possible to smoothly withdraw the plug member from the coating material injecting member and to advance and retreat frequently after that, and it is possible to satisfactorily perform the molding without interfering with the injection of the fluid coating material. It is possible.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a first embodiment of a resin molding coating apparatus according to the present invention during mold clamping.

FIG. 2 is a partial cross-sectional view showing a state in which the auxiliary mold is retracted from the state of FIG.

FIG. 3 is an enlarged cross-sectional view of a main part in the state of FIG.

FIG. 4 is an enlarged cross-sectional view of a main part in the state of FIG.

5 is an enlarged cross-sectional view showing a state where the split mold is loosened from the state of FIG. 4 and a coating material is injected.

FIG. 6 is an enlarged cross-sectional view of a main part of the resin molding coating apparatus according to the second embodiment when the mold is clamped.

FIG. 7 is an enlarged cross-sectional view of an essential part showing a state in which the auxiliary mold is retracted from the state of FIG.

FIG. 8 is an enlarged cross-sectional view showing a state where the split mold is loosened from the state of FIG. 7 and a coating material is injected.

FIG. 9 is an enlarged cross-sectional view of a main part of the resin molding coating apparatus of the third embodiment when the mold is clamped.

10 is an enlarged cross-sectional view of a main part showing a state in which the auxiliary mold has been retracted from the state of FIG.

FIG. 11 is an enlarged cross-sectional view showing a state where the split mold is loosened from the state of FIG. 10 and the coating material is injected.

FIG. 12 is a partial cross-sectional view at the time of mold clamping, showing an example of a conventional resin molding device.

13 is a partial cross-sectional view of the conventional resin molding device shown in FIG. 12 at the time of injecting a coating material.

[Explanation of symbols]

 S Resin Molding Covering Device 1 Resin Molded Product 11 Lower Surface 12 Light Beam Shaped Part 2 Coating Material 2A Coating Layer 3 Upper Mold 4 Lower Mold 41 Through Hole 6 Coating Material Injection Member 6b Plug Member 6c Coating Material Injection Hole 6d Tip Opening 6e Tip Part 61 tip outer peripheral surface 7 auxiliary type 71 concave umbilicus

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeru Oka 5-8 Nishimitabicho Suita City Osaka

Claims (5)

[Claims] 1. An apparatus for forming a coating layer on one side of a resin molded product molded using a split mold, wherein one mold of the split mold has a coating material injection hole provided therein. A coating material injection member having an open front end surface is provided so as to be inserted into the resin molded product, and the other die faces the coating material injection member and is provided at the front end opening of the coating material injection hole. A resin molding coating apparatus, wherein an auxiliary mold which does not contact is provided inside, and a plug member which penetrates the injection hole and advances and retreats is provided inside the injection hole of the coating material injection member. 2. The resin molding coating apparatus according to claim 1, wherein the auxiliary mold is internally removably installed in the other mold. 3. The resin molding coating apparatus according to claim 1, wherein the outer peripheral surface of the tip of the coating material injection member is formed with a tapered taper at a portion to be inserted into a resin molded product. 4. The tip of the coating material injection member inserted into the resin molded product formed by the split mold is close to the auxiliary mold without penetrating the resin molded product, and is thin on the resin molded product. 1. A flash-shaped portion is formed.
3. The resin molding coating device according to any one of 3 above. 5. A coating material injected into the auxiliary mold from a coating material injection hole of the coating material injection member is injected into one side of the resin molded product by breaking the thin flash-shaped portion of the resin molded product. The resin molding coating apparatus according to claim 4, wherein a concave navel portion into which the separated thin flash shape portion of the resin molded product enters is formed.