JPH11114994A - Method for molding composite moldings and mold apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce facilities for molding to a minimum limit by setting a skin material in a pair of molds, then cutting the material in a predetermined shape at a predetermined position in the mold, holding it in the mold, supplying a thermoplastic resin to become a base material to a back surface and a residual part of the held ski material, and press molding it. SOLUTION: An urging means 14 of a skin material cutting and holding means of a fixed mold 2 side is operated, and a cutting edge 17 is projected from a surface of a protrusion die 10 of the mold 2 and forced to a skin material S to cut the material S in a predetermined shape. And, the material S is strongly held by a holding surface and a molding surface 4 of a movable mold 1. In a skin material holding means 16, the means 14 made of a cylinder is urged by an approaching pressure of the mold l, retracted and the material S is contracted without breakage. Closing of the mold 1 is proceeded. And, at the time point when an interval of the mold becomes about 15 mm, movement of the mold 1 is temporarily stopped. A thermoplastic resin is supplied between a back part of the material S and the residual molding surfaces 4, 9 via a resin passage by a resin supply means. Then, a valve gate is closed to finish closing of the mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a mold apparatus for molding a composite molded article in which a part of the surface of a substrate made of a synthetic resin is covered with a skin material using a pair of opposed molds.

[0002]

2. Description of the Related Art Conventionally, a composite molded product in which a part of the surface of a base material made of a synthetic resin is covered with a skin material is used for automobile interior parts,
It is widely used for home appliances, indoor furniture, etc. As a method of molding it, 1) a method of covering a surface of a preformed base material with a skin material and bonding it with an adhesive, 2) pressing a base material in a mold press A method is adopted in which a skin material is set in a mold in advance at the time of molding, and the skin material is integrally attached to the base material simultaneously with the formation of the base material. However, in the above method 1), the molding of the base material and the molding and sticking of the skin material are performed in separate steps, so that many facilities are required and it takes time to complete the molding. In recent years, these methods have not been implemented except in special circumstances. On the other hand, the above-mentioned method 2) is widely practiced because there is no such problem.

[0003]

When a composite molded article is to be obtained by the above method 2), there are the following problems.
It is difficult to keep the boundary line between the exposed part of the base material and the part covered by the skin material constant at all times, and it is troublesome to accurately set the pre-cut skin material terminal to the predetermined position of the mold. The content was nervous and required skill.
For this reason, there has been an economical problem that many defective products occur due to the inability to accurately set the skin material. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a molding method which forms a composite molded product in which a part of a base material is covered with a skin material with high quality and reliability is economically advantageous. It is an object of the present invention to provide a mold apparatus that performs the following.

[0004]

Means for Solving the Problems In order to achieve the above object, a method for molding a composite molded article according to the present invention comprises the steps of: forming a composite molded article in which a part of the surface of a substrate is covered with a skin material;
A method of molding using a pair of opposing dies, a step of setting a skin material to one of the pair of opposing dies, and bringing the skin material closer to the pair of dies by a pair of dies. Releasing the set of the skin material after being squeezed and contacted and supported on the molding surface of the mold, and the skin material cutting and holding means provided in the pair of molds is protruded from the molding surface of the mold to form the skin material. A step of cutting the skin material into a desired shape and holding the cut end of the skin material firmly and elastically, and a back surface of the skin material left between the molding surfaces of the pair of molds after removing unnecessary portions of the cut skin material. Supplying the thermoplastic resin between the position and the molding surface of the remaining mold, the step of further closing the pair of molds and pushing out the supplied thermoplastic resin to spread it over the whole; and Protection of the skin material by the skin material cutting and holding means And closing the pair of molds while finalizing the mold, molding the thermoplastic resin, and integrally attaching a skin material, and performing this molding method. A mold device for molding a composite molded product in which a part of the surface of the base material is covered with a skin material using a pair of opposed dies, A skin material cutting blade that is provided in one of the molds and has a skin material cutting blade at its tip and a holding surface that holds the skin material, and is elastically supported so that it can advance and retreat from the inside of the mold to the outside of the molding surface. A holding means and a resin which is provided to penetrate the front and back surfaces of one of the pair of molds and supplies a thermoplastic resin between the back surface of the cut skin material and the molding surface of the remaining molds. Supply means.

According to the present invention, by employing the above solution, the skin material is cut along a predetermined line while being set and held in a mold, and the skin material and the base material are simultaneously formed at the same time when the base material is formed. Since the sticking is performed, the quality of the composite molded article to be molded is always stable, the number of working facilities is reduced, and it is economically advantageous.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of the mold apparatus, and FIG. 2 is a view taken along the line AA in FIG. The mold apparatus includes a movable mold 1 and a fixed mold 2. The movable mold 1 has a concave die 5 having a concave molding surface 4 attached to the front surface of a movable die base 3. Is provided with a skin material set pin 7 which appears and disappears on the parting surface by the operation of the cylinder 6 so that the skin material S having a hole formed at a predetermined upper position can be locked and suspended (see FIG. 1). I have. On the other hand, the fixed die 2 has a convex die 10 having a molding surface 9 corresponding to the concave die 5 mounted on a front surface of a fixed die base 2A via a mount 8.

[0007] Further, the convex member 10 is attached to urging means 14 and 14 comprising a cylinder via a plate 15, and the skin material cutting and holding the tip thereof is always in a position which coincides with the surface of the convex member 10. Means 16 are provided, and the tip of the skin material cutting and holding means 16 has a protruding cutting blade 17 (see FIG. 2) along the boundary line between the base material and the skin material S, and the cut surface of the skin material S. A holding surface 18 for holding the outer peripheral portion is formed. Further, a guide pin 19 is provided on the back of the plate 15.
Is fixed, and the base 8 corresponding to the guide pin 19 is fixed.
A through hole 20 through which the guide pin 19 passes is formed at the position. In addition, at the rear position of the plate 15 on the gantry 8, the retracting position of the skin material cutting and holding means 16 (the tip is
A stop block 23 for determining the position (coincident with the surface of 0) is attached. In addition, the fixed die 2 passes through the convex die 10 from the fixed die base 2A and the gantry 8 to the molding surface 9,
A resin supply means 24 for supplying a thermoplastic resin between the molding surfaces 4 and 9 is provided.
5, a heater 26 surrounding it, and a valve gate 27 provided at the tip end, and the cut skin material S
Are formed as appropriate between the rear surface portion of the first and second molding surfaces 4 and 9.

[0008] A procedure for molding a composite molded article by the thus configured mold apparatus will be described. The cylinder 6 of the movable mold 1 is extended to operate so that the skin material set pin 7 protrudes from the parting surface, and the skin material set pin 7 is set in a state where the hole of the skin material S is locked and suspended. Next, the movable mold 1 is moved closer in the direction of the fixed mold 2, and the skin material S
Is narrowed down by the convex mold 10 of the fixed mold 2 to the concave forming surface on the movable mold 1 side, and the skin material S is supported in contact between the fixed mold 2 and the movable mold 1. Next, after the cylinder 6 is contracted and the skin material set pin 7 is retracted to release the engagement of the skin material S, the approaching movement of the movable mold 1 is further advanced and the movable mold 1 is moved to a predetermined position. The approach movement of the movable mold 1 is temporarily stopped when approaching. Next, the urging means 14 of the skin material cutting and holding means 16 on the fixed mold 2 side is operated, and the cutting blade 17 protrudes from the surface of the convex mold 10 of the fixed mold 2 and is pressed against the skin material S to be pressed. S is cut into a predetermined shape and is strongly held by the holding surface 18 and the molding surface 4 of the movable mold 1. Next, after the cut end material of the skin material is manually removed, the movable mold 1 is further moved and approached, and the skin material S is formed into a concave shape on the movable mold 1 side by the convex mold 10 of the fixed mold 2. It is further narrowed down to the surface. On the other hand, the skin material cutting and holding means 16 is retracted by the urging means 14 comprising a cylinder being pushed by the approaching movement pressure of the movable mold 1, and the skin material S is narrowed down without being broken.

Further, when the mold closing of the movable mold 1 is advanced and the mold interval becomes about 15 mm, the movement of the movable mold 1 is temporarily stopped, and the thermoplastic resin is supplied by the resin supply means 24 through the resin passage 25 through the skin. The material S is supplied to the back and between the remaining molding surfaces 4 and 9, and after closing the valve gate 27, the mold is closed and the mold is closed. At this time, the mold interval is set to a predetermined value (10 to 3 mm).
At that time, the skin material cutting and holding means 16 is forcibly retracted by the retracting operation of the urging means 14 and 14, so that the plate 15 hits the stop block 23 and is located at the retracted end. Then, the supplied thermoplastic resin is pressed by the molding surface or the back surface of the skin material S by closing the mold, and is spread between the molding surfaces 4 and 9 of the mold as the closing of the mold proceeds. In addition, since the retreat timing of the skin material cutting and holding means 16 is set as described above, the resin material is somewhat removed from the skin material S and the convex mold 10.
And the skin material S is pressed and fixed to the movable mold 1 side, so that no displacement of the skin material S occurs. Note that the resin supplied to the holding surface 18 of the skin material cutting / holding means 16 is bounded by the resin supplied to the portion where the skin material S is present before the resin supplied to the portion where the skin material is not present. The supply amount of the resin is controlled by adjusting the valve gate 27 so as to arrive. By doing so, it is possible to prevent the resin from going around the front side of the skin material. Thereafter, the molded product is cooled for a predetermined time, the mold is opened, and the molded product is taken out.

In the above-described embodiment, the skin material S is cut by the protruding cutting blade 17, but as shown in FIG. 3, the shearing cutting blade 17, 1 having a concave shape is formed as shown in FIG.
7 may be performed. Further, when the cut end of the skin material S is to be attached to the base material in a wood-grained state, the holding surface 18 of the skin material cutting and holding means 16 is formed as a concave groove-shaped concave surface 18A as shown in FIGS. A corresponding convex surface 18B is provided on the movable mold 1 side to be cut, and the cutting blade 17A is
If provided at the end of 8B or the end of the concave surface 18A, the end of the skin material S is held in a groove receiving shape, and is attached in a wood-grained state at the time of molding and sticking with resin.

[0011]

As is apparent from the above description, the present invention sets the skin material in a pair of molds, cuts and holds the skin material at a predetermined position in the mold, and holds the skin material. Since the backside and the remaining part are supplied with the thermoplastic resin serving as the base material and press-molded, it is necessary to complete everything from cutting the skin material to molding the base material and attaching the skin material in the mold. In addition, the equipment for molding can be minimized, and the skin material can be adhered with high accuracy and reliability.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a mold apparatus for carrying out the method of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a schematic view showing another example of the skin material cutting and holding means.

FIG. 4 is a schematic diagram showing still another example of the skin material cutting and holding means.

FIG. 5 is a schematic view showing still another example of the skin material cutting and holding means.

[Explanation of symbols]

 Reference Signs List 1 movable mold 2 fixed mold 14 urging means 16 skin material cutting and holding means 17 cutting blade 18 holding surface 24 resin supply means 27 valve gate S skin material

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI // B29K 101: 12 B29L 9:00

Claims (9)

[Claims] 1. A method of molding a composite molded article having a part of the surface of a base material covered with a skin material using a pair of opposed dies, wherein one of the opposed pair of dies is used. A step of setting a skin material, a step of bringing the pair of molds close to each other, squeezing the skin material onto a molding surface of the pair of molds, and supporting the contact material, and then releasing the setting of the skin material; A step of projecting the skin material cutting and holding means provided in the mold from the molding surface of the mold to cut the skin material into a desired shape, and firmly and elastically holding the cut end of the skin material; and A step of supplying a thermoplastic resin between the molding surface of the remaining mold and the rear surface position of the skin material left between the molding surfaces of the pair of molds after removing unnecessary portions of the pair of molds, and further comprising: Close the mold and push the supplied thermoplastic resin. And releasing the holding of the skin material by the skin material cutting and holding means, closing the pair of molds to form the thermoplastic resin, and adhering the skin material integrally. And forming a composite molded article. 2. The holding of the skin material by the skin material cutting / holding means is carried out by forming a concave groove on the back side of the skin material and holding the concave and convex surface corresponding to the concave groove on the front surface side. The method of molding a composite molded article according to claim 1, wherein 3. The supplied thermoplastic resin is expanded by closing a pair of molds so that the resin on the back surface of the skin material precedes the resin between the molding surfaces of the remaining molds. 3. The molding method for a composite molded article according to claim 1, wherein the supply is performed after being adjusted so as to reach an end of the skin material. 4. A mold apparatus for molding a composite molded product having a part of the surface of a base material covered with a skin material using a pair of opposed dies, wherein the pair of dies is provided. Skin material cutting and holding means provided in one of the molds and having a skin material cutting blade at its tip and a holding surface for holding the skin material and elastically supported so as to be able to advance and retreat from the inside of the mold to the outside of the molding surface. When,
A resin supply unit that is provided so as to penetrate the front and back surfaces of one of the pair of molds, and supplies a thermoplastic resin between the back surface of the cut skin material and the molding surface of the remaining molds, A mold apparatus comprising: 5. A holding surface of the skin material in the skin material cutting / holding means, in which one mold side is a concave surface formed as a recessed groove and the other mold side is a convex surface corresponding to the concave surface. The mold apparatus according to claim 4, characterized in that: 6. The die apparatus according to claim 4, wherein the cutting blade of the skin material cutting and holding means is a cutting blade for hitting and cutting. 7. The die apparatus according to claim 4, wherein the cutting blade of the skin material cutting and holding means is a cutting blade for a shear cutting blade. 8. The mold apparatus according to claim 4, wherein said resin supply means includes a heater. 9. The mold apparatus according to claim 4, wherein a valve gate is provided at a tip end of said resin supply means.