JPS646935B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vacuum forming mold, and more particularly to a vacuum forming mold for joining the edge of a skin material to the back surface of a core material.

Automobile interior parts such as instrument panel pads, door trims, etc., as well as various types of furniture, consist of a foam layer laminated on a core material, and a skin material covering the foam layer, and the ends of this skin material are connected to the core. It has a structure in which it is rolled up on the back side of the material and the rolled-up margin is glued. However, in this type of manufacturing method, it takes time and effort to set the core material, foam material, and skin material, respectively. Therefore, as a solution to this problem, vinyl chloride,
A composite skin body made by laminating a foam material such as polyurethane foam on a skin material such as ABS resin is suction-adhered to the inner surface of a lower mold for vacuum forming equipped with multiple suction holes, and the end portion of the composite skin body is attached to the back surface of the core body. A method of adhering to is proposed.

However, in this case, the end of the composite skin body, which is the margin for wrapping, is left free, so
When the upper mold was combined with the lower mold, the end part sometimes hung downward, and the end part often joined unexpectedly to other places without completely going around the back side of the core material. . As a result, the length of the end of the composite skin, which provides room for wrapping, is inevitably shortened, and as a result, the adhesive area between the end of the skin and the core is reduced, and the adhesive force is reduced, making it easier to peel off. There were drawbacks such as:

The present invention improves these points and provides a vacuum forming mold that can accurately adhere the end portion of the skin material to the back surface of the core material.The present invention is characterized by the vacuum suction in the lower mold. A hollow part for the mold is placed separately at the lower part of the one-step taller flange surface provided around the lower mold periphery and at the lower part of the inner surface of the mold located at the center where the skin material is adsorbed, and on the flange surface. An upper mold holder is provided which opens toward the inner surface of the mold, and a push block having a tip end as a bias surface and an acute-angled apex at the upper end is installed in the space formed between the flange surface and the upper mold holder; This vacuum forming mold is capable of sliding on the flange surface toward the inner surface of the mold.

Hereinafter, specific embodiments of the present invention will be described using the accompanying drawings.

FIG. 1 is a plan view of the lower mold for vacuum forming according to the present invention, in which the inner surface 3 of the mold 1 located in the center is provided with one stage on each circumference, for example, in accordance with the shape of the molded product to be molded. A tall flange surface 2 is raised, and a cavity 4 for venting air from the flange surface and a cavity 5 for venting from the mold's inner surface are independent at the lower part of the flange surface 2 and the lower part of the mold inner surface 3 where the skin material is adsorbed. The flange surface 2 and the mold inner surface 3 are provided with ventilation holes 6 and 7 communicating with the respective cavities 4 and 5, and the bottom wall 8 of the lower mold 1 is provided with
Also, vacuum pumps p, p are connected from each venting cavity 4, 5.
Suction passages 10, 10 that communicate with each other are extended, and the insides of each cavity 4, 5 are configured to be evacuated separately.

An upper mold holder 11 having an opening facing the inner surface 3 of the mold is mounted on the flange surface 2, and a space 12 formed by the flange surface 2 and the upper mold holder 11 contains surrounding objects. Depending on the number of flange surfaces 2, for example, if there are four flange surfaces, a total of four push blocks 13, 1 are provided for each flange surface.
3 is installed inside the mold so that it can be slid on the flange surface 2 with a predetermined stroke in the direction of the mold inner surface 3 by an air cylinder 14. The push block 13 has its tip end as a bias surface, and the push block 13 uses a bias surface 9 having an acute apex 15 as its upper end to make it easier to bend the end portion of the skin adsorbed to the inner surface of the mold. The stroke of the push block 13 is regulated so that the push block 13 stops at a position where the obtuse lower end 9' of the bias surface 9 of the push block coincides with the inner edge of the flange surface.

Next, to explain the functions and effects of the vacuum forming mold according to the present invention, first, the composite skin material 18 is heated and softened by laminating the skin material 16 made of vinyl chloride, ABS resin, etc. and the foamed material 17 such as polyurethane foam in advance. Finally, the composite skin material 18 is set on the lower mold 1 so that it completely covers the inner surface 3 of the mold, and the peripheral edge of the composite skin material 18 extends onto the flange surface 2, more specifically, onto the upper mold holding table 11. Then, each push block 13 is advanced in the direction of the inner surface 3 of the mold, so that the obtuse lower end 9' of the bias surface 9 of the push block 13 is aligned with the inner edge of the flange surface 2. Then, both the flange side cavity 4 and mold inner side cavity 5 are evacuated to form a composite skin material (see FIG. 3). In this case, the push block 13 maintains the advanced state and the cavity 4 of the flange surface 2 is also degassed, so the composite skin material 18 is adsorbed onto the surfaces of the upper die holding table 11 and the push block 13. Complete typing then proceeds.

Next, degassing is stopped only on the side of the cavity 4 on the side of the flange surface 2, and the composite skin material 18 is cut from the tip of the push block 13, specifically at the acute apex 15 of the bias surface 9, to trim the skin. (See Figure 4). Therefore, the remaining composite skin material 18 is more efficiently adsorbed to the inner surface of the mold by degassing only the inner cavity 5 of the mold.

Thereafter, as shown in FIG. 5, only the inner cavity 5 of the mold is evacuated, the push block 13 is moved back to the opposite side, and the upper mold 19 is assembled. Even if the end becomes free, the free end is molded in advance in the skin molding process shown in FIG. It won't drop any further than that. Thereafter, a hard polyurethane foam that will become the core material 20 is cast, cured, and then removed from the mold. In the obtained molded product 21, as illustrated in FIG. 6, the end portion of the composite skin material 18 is completely and beautifully joined to the back surface of the core material 20.

In the vacuum forming mold of the present invention, the cavity is separated into the flange surface cavity and the mold inner cavity, so the composite skin material on the part that will become the product surface can be efficiently removed by degassing the mold inner cavity. A composite skin material that can be adsorbed to the inner surface of the mold, has a slidable push block with the tip on the flange surface as a bias surface, and has an acute angled top at the upper end, and is intertwined with the deaeration effect of the cavity on the flange surface. Since the end edge of the composite skin material can be molded in a state where it is tilted toward the main body, the end edge of the composite skin material can elastically come into close contact with the inner surface of the upper mold. The end edges of materials can be joined accurately, beautifully, and quickly.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a lower mold for vacuum forming according to the present invention, FIG. 2 is a partially enlarged vertical sectional view of the lower mold, and FIG.
FIGS. 4 and 5 are explanatory diagrams showing the steps of sequentially manufacturing foam molded products using the vacuum forming mold according to the present invention, and FIG. FIG. In the figure, 1 is the lower mold for vacuum forming, 2 is the flange surface,
3 is the inner surface of the mold, 4 is the flange surface venting cavity, 5 is the mold inner venting cavity, 6 and 7 are the venting holes, 9 is the bias surface, 9' is the acute angle lower end, 11 is the upper mold holding stand,
13, 13 is a push block, 15 is an acute apex, 18 is a composite skin material, 19 is an upper mold, and 21 is a molded product.

Claims (1)

[Claims] 1. A one-step taller flange surface 2 is provided around the mold inner surface 3 located at the center of the lower mold 1, and a vacuum is provided at the lower part of the flange surface 2 and the lower part of the mold inner surface 3, respectively. The suction cavities 4 and 5 are arranged independently, and an upper mold holder 11 having an opening toward the mold inner surface 3 is provided on the flange surface 2, and the flange surface 2 and the upper mold holder are A push block 13 having a bias surface 9 at its tip end and an acute apex 15 at its upper end is installed in a space 12 formed by 11, and the push block 13 can be slid on the flange surface 12 in three directions on the mold inner surface. A vacuum forming mold characterized by: 2. When the push block 13 moves forward in the direction of the inner surface 3 of the mold, its stroke is restricted to a position where the obtuse lower end 9' of the bias surface 9 of the block coincides with the inner peripheral edge of the flange surface 2.
Vacuum forming mold described in section.