JPH0474615A - Manufacture of composite molded piece and its press mold - Google Patents

Abstract

PURPOSE:To prevent generation of flashes or a sink, by a method wherein a flow preventive member is provided on an intermediate part molding surface between a recessed part and placing position of a base material in a molten state by a manufacture of a composite molded material having a through hole and the same is controlled so that a flow of the base material to a recessed part is prevented until a time directly before completion of mold clamping. CONSTITUTION:A skin layer 24 obtained by laminating a skin material 17 of a PCV sheet and a polypropylene cushioning material 18 is charged inbetween molding surfaces 25, 26 of a top force 21 and bottom force 22. A base material 23 which is heated and in a semimolten state is put on a part in the vicinity 26b of the center on a molding surface 26 of the bottom force 22. Since a flow preventive member 29 is pushed up by a spring 32 and projected from the molding surface 26, the base material 23 does not flow directly into a recessed part 26a. When the top force 21 is pushed down and the skin layer 24 and base material 23 are molded, abutting pins 31a, 31b are pushed down by both end parts of the molding surface 25 and flow preventive member 29 is pushed down through connecting plates 30a, 30b. Therefore, the base material 23 is extended completely and a molded material which has a through hole part 20c formed precisely and is free from flashes or a sink, is obtained.

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD 1 The present invention relates to a method for manufacturing composite molded bodies such as interior parts such as various trims of automobiles, and a press die used for the manufacturing. BACKGROUND OF THE INVENTION For example, various types of trim for automobiles are composite molded products in which a base material is pressure-bonded to a skin layer, and a cold press method is often used as a manufacturing method for these products. Examples of the above-mentioned cold press method include JP-A-62-1
This has been proposed in Japanese Patent Application Laid-open No. 8111 and Japanese Patent Application Laid-open No. 18114/1982, and this will be explained with reference to FIG. Reference numeral 1 denotes an upper mold, which is moved up and down by a pressure device (not shown) to press the product to be pressed on a pair of lower molds 2. Before pressurization, a skin layer 4 is placed between the molding surfaces 5 and 6 of the upper mold 1 and the lower mold 2, and a molten base material 3 is placed on the molding surface 6 of the lower mold. It will be placed. Base material 3 of each molding surface 5.6 of the upper mold 1 and the lower mold 2
A side land portion (hereinafter referred to as land) 7.8 having a draft angle with respect to the suppression direction is provided at the extension of the outer peripheral edge of the molding area.
The gap between the land 7.8 when the land 7.8 is pressed and molded is formed to be equal to the thickness of the skin layer 4 when it is pressed and molded. The operation of the known device having the above configuration will be explained. Before pressing, there is a thickness of 0 between the molding surfaces 5 and 6 of the upper mold 1 and lower mold 2.
．． A sheet-like skin layer 4 of 3 to 4 m long, such as a napped fiber product such as a woven fabric or a carpet, or a soft vinyl chloride resin, is held by a clamping device (not shown). Then, the forming surface 6 of the lower mold 2 is adjusted to about 30 to 50°C.
was heated to a semi-molten state through a nozzle of an extruder (not shown) at 150 to 250°C.
For example, a base material 3 made of thermoplastic resin such as polypropylene or polyethylene is placed, and an upper mold 1 is pressed downward by a pressure device (not shown), and a skin layer 4 is placed between it and a lower mold 2.
and base material 3 are compressed and joined to produce a composite molded body. At this time, there is only a gap between the land portions 7° 8 of the upper die 1 and the lower die 2 between the thickness of the first skin layer 4 during pressing and molding and the gap between the paths, so that the base material 3 is half-filled. Even in a molten state, it does not flow out of the mold from the land 7.8,
Paris is also configured so that it does not occur. When molding an automobile front seat back panel 20 as shown in FIG. 1 using the above press mold, one head and two
Since a through-hole portion 20c is provided between 0a and the back portion 20b, the upper and lower molds 1.2 corresponding to the through-hole portion 20c
It is necessary to perform molding so that the base material 3 does not flow into the molding surface portion. For this reason, recently, as shown in FIG. 6, a protrusion 15a is provided on the molding surface 15 of the upper mold 11, and a recess 16a is formed on the molding surface 16 of the lower mold 12.
A press mold has been developed for molding (shown in FIG. 1).

[Problem to be solved by the invention]

However, when the base material 3 is placed approximately in the center of the molding surface of the lower mold 12 using the press mold and press-molded using the method described above,
After the base material 3 is placed by the nozzle until it is completely clamped, it may flow into or fall into the recess 16a. In such a case, cracks will occur in the product body, and since the weight of the placed base material 3 is often accurately measured, the amount that has flowed into the recess 16a will cause a shortage of material and defects such as underfilling. There was a problem that occurred. In view of this situation, from the time the base material is placed until the mold is completely clamped, the base material is prevented from flowing into the recess, and a through hole cannot be formed in the composite molded body. , and the early development of a press molding method and press mold that does not cause defects such as cracks and underfilling has become a problem. The present invention solves the above-mentioned problems, and the base material placed on the press mold does not flow into the recess until the mold clamping is completed, and when the press molding is completed, the base material is removed from the recess and molded. It is an object of the present invention to provide a press molding method and a press mold thereof that can spread the composite molded product over the entire surface and leave a hole in the composite molded product.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a method for manufacturing a composite molded article having a through hole using upper and lower press molds in which concave and convex portions are respectively formed at predetermined positions on the press molding surface.
A flow prevention member is removably installed on the molding surface between the recess and the position where the molten base material is placed, and the flow prevention member is used to prevent the base material from melting during press molding until just before the mold clamping is completed. A method for manufacturing a composite molded article, characterized in that press molding is performed in a controlled manner to prevent direct flow to the vicinity of the recesses, and a method for manufacturing a composite molded body, wherein recesses and protrusions are formed at predetermined positions on a press molding surface, and the recesses, In a set of press dies for manufacturing a composite molded body having a through hole in a part by engagement of the convex parts, at least one of the press dies has a molding surface where the concave part and the base material in the molten state are placed at a position. It consists of a press mold for producing a composite molded body, characterized in that a flow prevention member for the molten base material is installed in the intermediate part so as to be freely protrusive and retractable from the molding surface.

[For use]

Since the present invention has the above structure, when molding the seat back, etc., first, a skin layer in which a skin material and a cushioning material are laminated is clamped between the molding surfaces of the upper mold and the lower mold of the press. It is charged and held by the device. Then, a base material heated to 150 to 250°C and made into a semi-molten state is placed by a nozzle near the center on the molding surface of the lower mold, which is adjusted to 30 to 50°C. At this time, the flow prevention member is pushed upward by a spring or the like, and the tip thereof protrudes from the molding surface, so that the base material is stopped from moving and directly pushes into the recess. No inflow. Next, the upper mold is pushed down by a well-known pressure device to compress and mold the skin layer and the base material. and simultaneously push down the flow prevention member against the spring. When the upper mold is further lowered and the semi-molten base material is pressurized, the base material is stretched and corresponds to the through hole closed by the recess of the lower mold and the protrusion of the upper mold. As a result of being spread over the entire molding surface except for the parts, a seat back panel in which through-holes are formed is obtained.

【Example】

An example in which the present invention is applied to a front seat back panel of an automobile shown in FIG. 1 will be explained in detail with reference to FIGS. 2 to 4. FIG. 2 is a sectional view of the press mold of the present invention, and FIG. 3 is a sectional view of the main part of the flow prevention member. Reference numeral 21 denotes a pair of upper molds for press molding with a lower mold 22. Like the press mold shown in FIG. A concave portion 26a is provided on the inclined surface of the molding surface 26 of 22, which corresponds to the convex portion 25a. The lower mold 22 has a molding surface 26 at a position closer to the four parts 26a between the recess 26a and a position 26b where the molten base material is placed (preferably near the center of the molding surface 26). An open sliding hole 27 is formed in a slightly longer circular arc shape so as to surround one side of the recess 26a, and the sliding hole 27 communicates with a storage hole 28 formed inside the lower mold 22. The sliding hole 27 has a weir 2 which is a flow prevention member of the same shape.
9 is inserted in a removable manner, and the storage hole 28 is provided at its base.
A plate 29a is attached to the receiver inside, and a spring 32 causes the weir 2 to
9 is pushed up so as to protrude from the molding surface 26 of the lower mold 22. Connecting plates 30a and 30b are connected to both ends of the receiving plate 29a, respectively.
, 30b have abutment pins 31a and 31b attached to the lower die 22.
It is provided so as to protrude from the top surface. When molding the seat back, etc., each molding surface 25, 26 of the upper mold 21 and lower mold 22 configured as described above is used.
First, a skin material 17 made of a PvC sheet is placed between the
A skin layer 24 on which a polypropylene cushion 18 is laminated is loaded by a clamping device (not shown),
be held. Then, the base material 23 heated to 150 to 250°C and turned into a semi-molten state is placed near the center 26b on the molding surface 26 of the lower mold 22 adjusted to 30 to 50°C by a nozzle not shown. urge At this time, the flow prevention member 29 is pushed upward by the force of the spring 32, and its tip protrudes from the molding surface 26, so the base material 23 is stopped from moving here and directly It does not flow into the recess 26a. Next, the upper mold 21 is pushed down by a pressure device (not shown) to compress and mold the skin layer 24 and the base material 23. The base material 23 in this half-molten state
becomes pressurized. Abutment pins 31a, 31 whose both ends of the molding surface 25 of the upper mold 21 protrude from the ends of the molding surface 26 of the lower mold 22;
b and simultaneously presses down, the blocking member 29 is completely pushed down to the same level as the molding surface 26 via the connecting plates 30a, 30b connected to the abutment pins 31a, 31b, and the base material The material 23 is completely pressurized and stretched, and spread over the entire molding surface 26 except for the portion corresponding to the through hole 20C closed by the concave portion 26a of the lower mold 22 and the convex portion 25a of the upper mold 21. be done. As a result, the through hole 2
A seat back panel in which 0c is accurately formed is obtained. In the above embodiment, the base material 23 is placed directly on the lower mold 22, but it is also possible to arrange the skin layer 24 on the lower mold 22 and place the base material 23 thereon. good. In this case, contrary to the above embodiment, the upper mold may have a concave portion and the lower mold may have a convex portion, and the flow prevention member and the storage portion may be provided on the upper mold. Moreover, compressed air, a cylinder, etc. can also be used instead of the spring 32. In this case, the flow prevention member may be directly controlled by a fluid or a motor without using the abutment pin or connection plate of the above embodiment.

【Effect of the invention】

As described above, the present invention provides a method for manufacturing a composite molded article having a through hole by using an upper and a lower press die in which concave and convex portions are respectively formed at predetermined positions on a press molding surface. A flow prevention member is removably installed on the molding surface in the middle of the base material mounting position, and during press molding, the flow prevention member prevents the base material from directly flowing into the vicinity of the recess until just before the mold clamping is completed. A method for manufacturing a composite molded body in which concave and convex portions are formed at predetermined positions on a press molding surface, and through engagement of the concave and convex portions, a through hole is formed in a part. In a set of press dies for manufacturing a composite molded article having a molded body, at least one of the press dies has a molding surface provided with a flow-preventing molten base material at an intermediate portion between the concave part and the position where the molten base material is placed. By using a press mold for manufacturing a composite molded body in which the member is installed so that it can freely protrude and retract from the molding surface, it is possible to produce a composite molded body with a through hole without producing defects or defects such as cracks or underfilling, and it is easy to use the press equipment and This has the advantage that press molding can be easily performed without changing the process. . Figure 1 is a perspective view of the composite molded product of the present invention, Figure 2 is a cross-sectional view of the press die of the present invention, Figure 3 is a cross-sectional view of the main part of the flow prevention member, Figure 4 The figure is a plan view of the lower mold part, and FIGS. 5 and 6 are cross-sectional views of the conventional press mold. 1.11.21... Upper die of the press. 2.12.22... Lower mold of press, 3.23... Base material, 4.24... Skin layer, 1
5a... protrusion, 25a... convex part, 6a, 26a.
... recess, 27, ... sliding hole, 28, ... storage hole, 29, ... flow prevention member, 30a,, 30b ... connecting plate, 31a, 31b ... abutment pin, 32,...
Spring.

Claims (1)

[Scope of Claims] 1) A method for manufacturing a composite molded body having a through hole by using an upper and a lower press die in which concave and convex portions are respectively formed at predetermined positions on a press molding surface, wherein the concave portions and the molten state are A flow prevention member is removably installed on the molding surface in the middle of the base material mounting position, and during press molding, the flow prevention member prevents the base material from flowing directly into the vicinity of the recess until just before the mold clamping is completed. A method for producing a composite molded article, characterized in that press molding is controlled to prevent flow. 2) In a set of press molds for producing a composite molded body in which concave and convex portions are formed at predetermined positions on the press molding surface, and the concave and convex portions are engaged with each other, a part of the composite molded body has a through hole. Composite molding characterized in that a flow prevention member for the molten base material is installed in the molding surface of one of the press molds at an intermediate portion between the recess and the position where the molten base material is placed so that it can freely appear and retract from the molding surface. Press mold for body manufacturing.