JPS59138451A - Press-molding method of interior finish part for automobile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) This invention relates to an improvement in a press molding method for automobile interior parts.

(Prior art and its problems) In order to form automobile interior parts by laminating a skin material made of cloth, carpet, vinyl chloride, or other material on the surface of a press-formed body, first press-forming is performed. A synthetic resin board or a polypropylene composite resin board containing wood powder is heated and plasticized using a mold, and then pressed and compacted within the mold to form the mold. Next, an adhesive was applied to the surface of the J: sea urchin molded body, and an adhesive was also applied to the back side of the skin material, and a mold surface slightly larger than that of the first mold was formed. The molded body and the skin material were set in a second mold, and the second mold was pressed to press the core material made of the press molded body and the skin material to be integrated.

However, in such a press forming method,
First of all, two molds are required, and when bonding the skin material and core material in the second process, air pockets may occur between the skin material and the core material, and molding pressure during bonding may occur. Since the skin material is stretched by the process, the bonding surface moves, and complete bonding requires rotation, which requires a large amount of equipment and man-hours.

(Objective of the Invention) The object of the present invention is to enable molding of the core and bonding of the skin material to be performed simultaneously in a single molding process, thereby reducing equipment and man-hours.

(Structure and Effects of the Invention) In order to achieve the above object, the present invention provides a male mold which is formed with a protrusion projecting from the flat surface of the mold and a cutting block is arranged around the periphery of the protrusion. , a press molding method using a female mold having a flat surface of the mold with a recess that engages with the convex part, wherein a heat-plasticized synthetic resin plate is placed on the male mold, and A skin material is stretched over the female mold, and by engaging and pressing the male mold and the female mold, the synthetic resin plate is molded along the mold shape, and the surface of the molded body is molded. The present invention is characterized in that the skin material is pasted under tension, and the periphery of the molded body is trimmed between the cutting block and the periphery of the four parts.

According to the above structure, the core material is formed and the skin material is laminated.
can be done simultaneously in one press forming process, and
Since it is attached to a synthetic resin plate that has been heated and plasticized using press pressure, no adhesive is required, and air pockets do not form.Moreover, the skin material is attached under tension to the molded core material. Therefore, there are no wrinkles or local unbonded parts of the skin material during molding, and the periphery of the core material is trimmed at the same time as molding. , it has the advantage that the product can be completed by rolling it around the back side of the molded core material.

The method of the present invention also has the advantage that existing conventional molds can be used as they are.

(Description of Examples) FIG. 1 shows a press molding die used for carrying out the present invention.

In the figure, 1 is a u1 type, and 2 is a female type that engages with this Mt type.

A flat part 1a is formed on the surface of the male mold 1, and a convex part 1b is integrally provided in the center of the flat part 1a in accordance with the shape of the molded product. 1;
) A cutting block 3 is provided 4-1 on the periphery of the protrusion so as to surround the outer periphery of the protrusion.

The solid mold 2 has a flat part 2a corresponding to the flat part 1a, and four parts 2b at the center of the flat part 2a that engage with the convex part.
A cutter 4 is integrally embedded in the periphery of the flat portion 2a, and the blade portion at the tip thereof is opposed to the flat surface 1a of the male mold 1.

Next, a process of bonding the skin material at the same time as forming the core material using the press molding die configured as described above will be described.

First, when each mold 1.2 is opened as shown in FIG. I'll keep it.

Next, at this stage, if the constituent material of the core I is wood flour-containing ribo-propylene composite resin plate, etc., it is heated to about 230°C, which is near its melting point, and then molded into a plasticized state. Place it on the mold surface of mold 1.

Then, by immediately engaging the female mold 2 onto the male mold 1, the core material 11 is molded into a substantially convex shape along the shape of the mold surface, and
The skin material placed on the upper surface is stretched by the engagement pressure of the press, and is joined to the surface of the molded body while being similarly deformed under tension, and is bonded to the surface of the core material 10 by molten heat. Ru.

In this engaged state, the cutting block 3 cuts the core material 11 in a thinner manner between the cutting block 3 and the periphery of the four parts 2b of the female mold 2, and the cutter 4 cuts the skin material at the flat part. Cut the periphery of 10 and the periphery of core material 11.

If this state is maintained, both the molded core material 11 and the skin material are cooled and solidified by cooling the mold, and demolding becomes possible.

The clearance between the male mold 1 and the female mold 2 during press molding is the clearance d1 between the upper surface of the convex part 1b and the innermost part of the concave part 2b,
, lb is set to be small. Therefore, the cutting block 3 and the cutter 4 will come into contact with the opposing surface without any delay.

Fig. 4 shows the product obtained by the above-mentioned press forming. It is sandwiched and extremely thin, and the clearance d
Due to the difference in I and d2, the flat part (core material 1) is not bonded to the skin material, so the thinned part J is cut around the periphery of the core material 1. In this state, the skin material is rolled up and bonded to the back surface of the core material 11 as shown in FIG. 5, and the product is completed.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a press molding die used to carry out the method of the present invention, FIGS. 2 and 3 are explanatory cross-sectional views showing the press forming order using the press molding die, and FIG. FIG. 5 is a cross-sectional view of the molded product after being demolded, and FIG. 5 is a cross-sectional view showing the completed state of the molded product. 1... Wholesale die 1a... Flat part 1b... Convex part 2... -■ Mold 2b... Concave part 3... Cutting block 10... Skin material 11...Core material Patent applicant Kasai Kogyo Co., Ltd. Figure 1 Figure 2 b 2 -F Koni Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] (1) A male mold having a protrusion protruding from the flat surface of the mold and a cutting block arranged around the periphery of the protrusion, and a recess that engages with the projection on the flat surface of the mold. A press molding method using a female die carved in a mold, wherein a heat-plasticized synthetic resin plate is placed on the fiber mold soil, a skin material is stretched over the female mold, and the mold is By engaging and pressing the two female molds, the synthetic resin plate is molded along the mold shape, and the skin material is affixed under tension to the surface of the molded body, and the cutting block and the four peripheral edges A press-molding method for an automobile interior material, characterized in that the periphery of the molded body is trim-cut between.