JPS61121924A - Molding in vacuum molding - Google Patents

Abstract

PURPOSE:To mold a plastic-adhered molded body integrally and simultaneously by a method wherein a configured body and a vacuum molding die are covered by a thermoplastic plastic sheet and, thereafter, evacuation is effected to adhere the sheet to the configured body by the molding die. CONSTITUTION:The clamp 4 of the configured body, molded separately, is set at a predetermined position of the vacuum molding die 1 and the vacuum molding die 1, including the clamp 4, is covered by the heated thermoplastic plastic sheet 2 for forming a protection tube 8, thereafter, air is extracted through air extracting holes 3 to evacuate the air between the sheet 2 and the molding die 1 and adhere the sheet 2 to the clamp 4 and the molding die 1. Then, mold release from the molding die 1 is effected whereby the clamp 4, coated by the sheet 2 air-tightly, may be formed at the predetermined position of the protection tube, molded by vacuum, simultaneously and integrally.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to vacuum forming in which a thermoplastic sheet is molded in close contact with a mold. The present invention relates to a vacuum molding method for integrally molding various shaped bodies.

"Prior Art" and "Problems to be Solved by the Invention" Known vacuum forming involves placing a heated thermoplastic plastic sheet over a mold, reducing the pressure in the space between the plastic sheet and the mold, and Shape it in close contact with the mold. Therefore, for example, a tubular wire harness protective tube that accommodates a wire bundle of a wire harness and is used for arranging a vehicle body is formed by vacuum forming because it has a shape suitable for the above-mentioned vacuum forming. However, the clamps that are installed on the outer periphery of the wire harness protective tube and are fitted to key points on the vehicle body using feather-shaped check pieces to hold the wire harness on the vehicle body cannot be vacuum formed, so they must be made separately. It is molded as an independent member and can be fixed afterward by wrapping it with tape or gluing it to a vacuum-formed wire harness protective tube.

Therefore, the work involved in retrofitting is extremely complicated, and since it is retrofitted using handmade wood (difficult to automate), the mounting direction and mounting position may vary, causing problems with the clamp function, or the clamp may come off due to careless mounting defects. There are some drawbacks, such as:

An object of the present invention is to provide a new method for simultaneously forming various shapes to be attached to the surface of the vacuum-formed product at the same time as vacuum forming, and to solve the problems of the prior art described above.

``Means for Solving the Problems'' The present invention achieves the above-mentioned objects by ``a separate body to be formed on the surface of the vacuum-formed body when molding a vacuum-formed body by bringing a thermoplastic sheet into close contact with a mold. The shaped body is set in a vacuum mold, the thermoplastic sheet is placed over the vacuum mold containing the shaped body, and the pressure is then reduced to bring the thermoplastic sheet into close contact with the shaped body and the vacuum mold. , on the surface of the vacuum formed body,
This method consists of a method of integrally molding a shaped body closely coated with the thermoplastic plastic or sheet.

"Operation" According to the vacuum forming molding method of the present invention described above, various shaped bodies are simultaneously molded on the surface of the vacuum formed body, and the shaped bodies are tightly adhered by the thermoplastic sheet of the vacuum forming material. This has the effect of making it substantially integral with the vacuum-formed body of the main body, and making its mounting position extremely accurate.

“Examples” Examples will be described in detail below with reference to examples. First, FIGS. 1 to 8 show an embodiment in which a clamp is simultaneously molded on the surface of the above-mentioned wire harness protective tube. In the figure, the wire harness protective tube 8 (hereinafter simply referred to as the protective tube 8) has a pair of grooves having a semicircular cross section, which are bendably connected at one side edge, as shown in FIG. It is a tube body that accommodates and protects a bundle of electric wires, and a clamp 4 having a feather-shaped check piece 6 on the head of a column body 5 is attached to the outer periphery of the protection tube 8.
The clamp 4 is locked to the vehicle body to hold the wire harness. Conventionally, the protective tube 8 is vacuum-formed, the clamp 4 is molded as a separate object, and the substrate 7 is fixed to the outer periphery of the protective tube 8 with tape wrapping 9, which is attached afterwards.

The above protective tube with a clamp is molded as follows by the molding method of the present invention.

That is, referring to FIG. 1 showing the processing procedure, a separately molded clamp 4 is set at a required position of a vacuum mold 1 for a protection tube, and heating is performed to form a protection tube 8. thermoplastic plastic sheet) 2 (hereinafter simply referred to as sheet 2)
) is placed over the vacuum forming mold 1 (hereinafter simply referred to as the forming mold 1) including the clamp 4, and then the air vent hole 8 is
The air between the sheet 2 and the mold 1 is evacuated, and the sheet 2 is brought into close contact with the clamp 4 and the mold 1 as shown in FIG. 10. When the mold 1 is released, as shown in FIG. 2, a clamp 4 tightly covered with a "sheet 2" is integrally molded at a predetermined position of the vacuum-formed protection tube 8 at the same time.

Next, Fig. 4.6 shows the side edge of the semicircular body of the protective tube 8.
This shows another embodiment of the present invention in which two claws 10 are molded at the same time, in which a separate lock claw 10 is set at a key point of the vacuum mold 1 for the protection tube 8, and the lock claws 10 are set separately from each other in the first embodiment. Similarly, the heated sheet 2 for molding the protective tube 8 is covered over the mold 1,
Thereafter, the pressure is reduced to tightly cover the outer periphery of the lock pawl 10 with the sheet 2, and the protection tube 8 is vacuum-formed with the sheet 2, and the lock pawl 10 is integrally molded on one side edge as shown in Figure 5. Generate tube 8.

Furthermore, Fig. 6.7 shows the present invention applied to a molded protector for a wire harness that accommodates a wire bundle of a wire harness and is attached to a corner of a vehicle body to securely hold the wire harness. This is an example of simultaneous molding. That is, reinforcing parts to supplement the mechanical strength required for the function of the molded protector are vacuum-formed at the same time as the main molded protector, and reinforcing members are placed at important points in the vacuum molding mold 1 for the molded protector. 12, and cover them with the heated sheet 2 for molding protector, then reduce the pressure and vacuum form the molded protector 11 with the sheet 2, and at the same time cover the surface of the reinforcing member 12 with the sheet 2.
A molded protector 11 is produced in which the reinforcing members 12 are integrally provided at key points of the main body with a uniform thickness by the sheet 2.

In addition, the clamp 4p2 claw 10 in each of the above embodiments
etc., considering the thickness of the sheet 2 to be covered,
It is preferable to form it in a small size in advance and take into account the shape necessary for operation after being covered with the sheet 2.

According to the above-described molding method of the present invention, various shapes can be simultaneously molded on the surface of a vacuum-formed product, which has been difficult in the past, and these shapes can be tightly covered with the material sheet of the vacuum-formed product. Since they are integrated, there is no need to add these shaped bodies afterwards, and the moldability of the molded body is greatly improved. There is no risk that the shaped bodies will come off, and they essentially function as an integral body, and when they are set in the mold 1, they can be mechanically accurately positioned, so the mounting orientation can be adjusted accurately without any variation. can do. Furthermore, in a vacuum-formed body having only a uniform wall thickness as in the embodiment shown in FIG. 6, the mechanical strength can be improved by partially thickening or reinforcing the wall.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be broadly applied to forming various shapes on the surface of a vacuum-formed product.

"Effects of the Invention" As described above, the present invention greatly improves the formability of the article in which various shapes are provided on the surface of the vacuum-formed product, and the shape is mainly formed by vacuum forming. It functions as a substantially integral part with the body, and has useful effects such as further stabilizing the original function of the shaped article and improving the mechanical strength of the vacuum-formed article.

[Brief explanation of the drawing]

Figures 1(g) to 0: Front view showing the molding procedure of the protection tube for wire harness with clamp according to the present invention-embodiment, Figure 2:
Fig. 1: A perspective view showing a wire harness protection tube molded in the embodiment; Fig. 8: A perspective view showing a conventional wire harness protection tube with a clamp; Fig. 4 (5) to 0: Other embodiments of the present invention. FIG. 5 is a front view showing the molding procedure of the protective tube for wire harness with round claws according to the example; FIG. 4 is a perspective view showing the protective tube for wire harness molded in the example, FIG. 6 (5)- (0
) n A front view showing the processing procedure of a molded protector for a wire harness according to another embodiment of the present invention, FIG. 7: A perspective view showing a molded protector molded in the embodiment shown in FIG. Molding mold, 2 plastic sheets,
8: Air vent hole, 4: Clamp, 8: Wire harness protection tube, 10: Lock claw, 11: Molded protector, 12
: Reinforcement member patent applicant: Toyo Harness Co., Ltd. (and 1 others)
name) Representative Patent Attorney Kenmi Oka I
Q)

Claims (1)

[Claims] (1) In molding a vacuum-formed article by bringing a thermoplastic sheet into close contact with a mold, a separate shaped body is set on the surface of the vacuum-forming mold, and the thermoplastic sheet is attached to the shaped body and the vacuum-formed mold. Then, the pressure is reduced to bring the thermoplastic sheet into close contact with the shaped body and the vacuum forming mold, and the shaped body with the thermoplastic sheet tightly coated on the surface of the vacuum formed body is integrally molded at the same time. A molding method in vacuum forming characterized by: