JPH04147826A - Apparatus and method for molding resin part - Google Patents

Abstract

PURPOSE:To prevent the generation of an inferior product due to the release of a skin body by also using a vacuum mold used in the vacuum molding of the skin body from a laminated sheet as a foaming mold without releasing the skin body. CONSTITUTION:A laminated sheet 20 is grasped by a clamp apparatus 16 to be transferred to the space between a pair of upper and lower heaters 27 and heated until properly softened. A vacuum apparatus 29 is driven and an assist plug 17 falls and the softened sheet 20 comes into close contact with the molding surface of a vacuum mold 15 to be subjected to vacuum molding. The vacuum mold 15 holding the sheet 20 is pushed by the pushing force of a cylinder 30 to be moved from a position A to a position B. The PP sheet 24 grasped by the clamp apparatus 16 and heated and softened by a heater 28 is positioned above the vacuum mold 15 by a sheet feeder 25 and the two-layer PP sheet 24 pressed by the vacuum mold 15 and a press mold 18 is integrated with the laminated sheet 20 to obtain a product. The product is released at a position C and the vacuum mold 15 is subjected to pretreatment such as the removal of impurity at a position D to be returned to the position A.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a molding apparatus and a molding method thereof for resin molding interior parts installed, for example, in the interior of an automobile.

[Conventional technology]

For example, a conventional example of molding resin products such as automobile door trims, clove boxes, console boxes, etc. in which a soft skin body is attached to the surface of a hard resin core material is i4.
As shown in FIGS. 3 to 6, a laminate sheet 3 in which a skin layer 1 and a foam layer 2 are double-layered is molded into a skin body 5 using a vacuum forming oak 4, and then this skin After the body 5 is set in the foam mold 6, a reactive hard urethane resin supplied from the raw material supply device 7 is injected between the skin body 5 and the core mold 6 through the mixing 8, and the reactive hard urethane resin is Urethane resin is reacted and cured in a foaming mold to create a resin product 10 in which a hard core material 9 and the skin body 5 are integrated.

[Problems to be Solved by the Invention] However, in such a conventional molding method for a three-layer resin product, after the skin body 5 is molded using a vacuum mold, the skin body 5 is set in the foaming mold 6. Then, this foaming mold 6
Since the product is made by injecting a hard urethane resin between the skin body 5 and the core mold, the skin body 6 is cooled after being removed from the vacuum forming mold, and the skin body is cooled after being released from the mold. Shrinkage and deformation occur due to aging time and external temperature, etc., and when this primary molded skin is set in a foaming mold, the skin cannot adhere tightly to the foaming mold. When a hard urethane resin is injected and foam molded, the skin may wrinkle or the urethane resin may leak, resulting in a problem in that defective molded products are likely to occur.

(Means for Solving the Problems) The present invention has been made by focusing on such conventional problems, and its first purpose is to vacuum form a skin using a laminate sheet as a raw material. The purpose is to make this vacuum forming mold double as a foaming mold without releasing the skin, thereby preventing the occurrence of defective products caused by the release of the skin.The second purpose is to:
The vacuum molding mold is moved intermittently and in a circle, making it possible to mold a product in which the skin and hard core material are integrated by moving the vacuum molding mold in a circle, reducing equipment costs and improving productivity. An object of the present invention is to provide a molding apparatus for resin parts and a molding method thereof.

〔Example〕

The present invention will be explained in detail below based on the embodiments shown in Figure 's1 and Figure 's2.

11 is a press device, and at the bottom of this press device 11 are two sets of rails 1 extending in the paper thickness direction in FIG.
A push-up table 13 for holding the rail 12 is installed to be able to move up and down, and the rail 12 is moved up and down by the operation of a cylinder (not shown) or the like. Reference numeral 14 denotes a mold stand placed on the rail 12, and a vacuum mold 15 is fixed onto this mold stand 14. A sheet material clamping device 16, which will be described later, is provided above the vacuum mold 15, and furthermore, an assist plug 17 and a pressing mold 18 are provided above the clamping device 16. Reference numeral 19 denotes a laminate sheet transport trolley. On this transport trolley 19, laminate sheets 20 in which a skin layer and a foam layer are laminated are stacked. A sheet feeder 22 is provided for pulling up the laminate sheet 20 with a suction cup 21 and having it clamped by the clamp device 16. Reference numeral 23 denotes a transport trolley 24 for polypropylene sheets (hereinafter referred to as PP sheets), which is used to pull up the PP sheets 24 one by one using suction cups 25 and clamp them to the clamp device 16. A feeder 26 is provided. 27 and 28 are heaters for heating and softening the laminate sheet 20 and the PP seeds 24. In FIG. 2, 30 is a first cylinder for pushing the mold table 14 on which the vacuum mold 15 is placed from the ■ position to the ■ position, and 31 is for pushing the mold table 15 in the ■ position to the O position. 32 is a third cylinder for pushing the mold table 15 at the O position to the O position, 33 is a third cylinder for pushing the mold table 15 at the 0 position to ■
This is the fourth cylinder for returning to position. Note that 29 is a vacuum device, and 34 is an auto clamp.

The above is a description of the structure of this embodiment.Next, its operation will be described.First, the uppermost laminate sheet 20 stacked is sucked up by the suction cup 21 and clamped by the clamp device 16. The clamp device 16 holding the laminate sheet 20 is transferred between a pair of upper and lower heaters 27, where the laminate sheet 20 is heated until it is appropriately softened. The laminate sheet 20 softened by the heater 27 is placed on the vacuum mold 15 , and then the push-up table 13 is pushed up to bring the softened sheet 20 into contact with the upper surface of the vacuum mold 15 . Thereupon, the vacuum device 29 is driven and the softened sheet 20 is brought into close contact with the mold surface of the vacuum mold 15 due to the vacuum effect and the descent of the assist plug 17, thereby performing vacuum forming. After the assist plug is raised, the vacuum mold 15 holding the formed sheet that has vacuum-formed the sheet 20 is pushed together with the mold stand from the ■ position to the ■ position by the pushing force of the first cylinder 30. At this time, the auto-clamp device does not automatically retract and prevent the movement of the mold table, and when the mold table 14 is closed to the ■ position, the mold table 14 is positioned by the protrusion of the auto-clamp device. . Position (2) Lid On the vacuum mold 15, the PP sheet 24, which is clamped by the clamping device 16 by the sheet feeder 26 and has been heated and softened by the heater 28, is placed. The softened pp receipt 4 is pressed into a vacuum mold 15, that is, the vacuum mold 15 at this time is used as a cavity mold of a press mold, and the press mold 18 is used as a core mold of the press mold. Thus, the vacuum mold 15 and the press mold 1
The two-layer PP sheet 24 pressurized by 8 and 8 is integrated with the vacuum-formed laminate sheet 20 to obtain a product with a three-layer structure. The vacuum mold 15 with the product is
The cylinder 31 moves to the 0 position together with the mold stand 14. The product is released from the evacuated mold 15 that has been moved to the O position, and then the vacuum mold 15 is moved to the 0 position by the operation of the third cylinder 32.
Move to position. The vacuum mold 15 that has been moved to the position
After that, the molding operation is repeated.

In the above embodiment, the vacuum mold 15 is moved by the cylinder 30.
, 31, 32, and 33 are explained,
Needless to say, the material is not limited to this, and any material that provides similar effects such as a chain, belt, or air cylinder may be used. Further, although the vacuum mold 15 is described as moving on a horizontal plane, it may be moved on a vertical plane.

In this way, in this embodiment, the softened sheet, which is a forming raw material, is fed and formed while the vacuum mold is moved intermittently and in a circular manner, and this vacuum mold is also used as a press mold. Therefore, it is possible to continuously manufacture molded products in which a hard core material is closely molded to a soft skin body using the same mold in the same molding equipment, which increases productivity. be able to. In addition, the skin body formed with a vacuum mold is not released from the mold until it is combined with the hard core material (until it becomes a product).
The product quality and yield can be improved without wrinkles on the skin or product defects due to leakage of the core material.

〔Effect of the invention〕

It has a mold that moves intermittently in a circular manner through the positions ■, ■, 0, 0, and the primary molding material is supplied and molded in the positions mentioned above, and the secondary molding material is placed above the primary molded product in the position ■. This is a molding method and apparatus for resin parts that sequentially and intermittently performs the following steps: supplying and overlapping and integrally molding, releasing the molded product at the 0 position, and returning the empty mold to the ■ position at the ■ position. According to the method, it is possible to continuously manufacture a molded product in which, for example, a hard core material is closely molded onto a soft skin body in the same mold, and productivity can be improved. In addition, the primary molded product molded with a single mold is not released from the mold until it is combined with the secondary molded product (until it becomes a product).
There are no wrinkles in the secondary molded product or product defects due to leakage of the secondary molded material, and the product purchase and yield can be improved.

[Brief explanation of drawings]

FIG. 1 is an explanatory front view showing an embodiment of the resin part molding apparatus according to the present invention, FIG. 2 is an explanatory plan view thereof, and FIGS. 3 to 6 are explanatory views of a conventional example. 11...Press device 12...Rail 13...
・Pushing stand 14...Mold stand 15...Vacuum mold
16... Clamp device 17... Assist plug 18... Push die 19... Transfer trolley 20... Laminate sheet 21... Suction cup 22... Sheet feeder 23... Transfer trolley 24...・PP sheet 25
... Suction cup 26 ... Sheet feeder 27
... Heater 28 ... Heater 29 ...
Vacuum device 30...first cylinder 31...
Second cylinder 32...Third cylinder 33...
Fourth cylinder 34...Auto clamp diagram diagram diagram diagram diagram

Claims (1)

[Claims] 1. A mold table movable in a circle, a mold fixed on the mold table, and the mold table (A), (B), (C),
A moving means for intermittently moving each position in a circle in (D), a transfer cart for loading the laminate sheet to be formed, a sheet feeder for taking out one of the laminate sheets on the transfer cart, and this sheet feeder. A clamping device that clamps the laminate sheet taken out by the laminate sheet, softens it with a heater, and then transfers it onto the mold at the (A) position, a transfer truck that loads the laminate sheet to be molded, and the laminate sheet on the transfer truck. A feeder that takes out one sheet, a clamp device that clamps the laminate sheet taken out from the feeder, softens it with a heater, and then transfers it onto the mold at the (B) position, and vacuum forms the laminate at the (A) position. A molding apparatus for resin parts, comprising a molding means for overlapping and integrally molding a hard resin sheet at position (B) on the vacuum-formed laminate sheet. 2. It has a mold that moves intermittently in a circular manner through the positions (A), (B), (C), and (D), and
A) Supply and molding of primary molding material in position, (
At the B) position, the secondary molding material is supplied to the upper side of the primary molded product and integrally molded.The molded product is released from the mold at the (C) position, and the vacuum forming mold is moved to the (A) position at the (D) position.
) A molding method for resin parts that is characterized by sequentially and intermittently returning the parts to their positions. 3. The resin part molding apparatus according to claim 1, wherein the moving means is a hydraulic or air cylinder. 4. The resin part molding apparatus according to claim 1, wherein the moving means is a sheet clamp conveyance rail.