CN1125415A

CN1125415A - Apparatus for producing a thermoplastic article having an undercut cross section

Info

Publication number: CN1125415A
Application number: CN 94192494
Authority: CN
Inventors: 弗朗科·切沙诺
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-04-18
Filing date: 1994-04-18
Publication date: 1996-06-26

Abstract

An equipment comprises a mould component (16) having a working surface (18). Against the mould component a preheated thermoplastic material sheet (12) is impelled. The equipment at least contains a movable component for limiting a cavum (38) with a resected cross-section at the downside. In practical use, the movable component encircles the part of the circle convex of the mould sheet (12), the portion of which is deformed by the compressed airflow out of a compressed air device (36).

Description

Production has the equipment of the thermoplastic article of undercut cross section

The present invention relates to be used to produce the equipment of the goods of being made by thermoplastic and have undercut cross section, especially for the equipment of automobile liner, such as the car door interior lining panel, perhaps door handle and liner plate form one or are installed together.

Although the present invention develops with regard to accessory in the automobile especially, and be not intended to be limited in this field, produce when expectation and have undercut cross section and can use the present invention during by the parts that can be covered and form by the thermoplastic sheet material of hot press mold shaping.

In molded this concrete field of thermoplastic sheet material, produce when having the mould of undercut cross section parts and can run into sizable difficulty in order to processing.In fact, the traditional handicraft of thermoplastic sheet material hot press mold shaping is by the sheet material that can press mould-forming between two molded parts molded surfaces, it comprises that needs form the molded parts have moving part, is used to produce angle with the molded parts direction of relative movement less than arranging projection on 90 ° the position.

In order to overcome above-mentioned problem, theme of the present invention is to have the equipment that forms the claim theme feature.

Describe the present invention in detail now with reference to accompanying drawing, the mode by non-restrictive example provides fully.

Fig. 1 is a perspective schematic view that has the arrangements for automotive doors of the goods of producing according to present device.

Fig. 2 is the section that cuts along I-II line among Fig. 1.

Fig. 3 and Fig. 4 are the work perspective view of expression according to first embodiment of present device,

Fig. 5 and Fig. 6 are the work perspective view of expression according to second embodiment of present device.

With reference to Fig. 1, arrangements for automotive doors represents that with 1 the liner plate 2 that has handle 4 is contained in its inside, also forms handrail 6.Handle can be to constitute by being installed in the element that separates on the liner plate 2, perhaps forms an integral body with liner plate.

Can find out that from Fig. 2 handle 4 has a undercut cross section, present groove shape with arch section 8 and two terminations that face toward mutually 10.

Referring now to Fig. 3 and Fig. 4, handle is made by hot press molding technology, and the thermoplastic sheet material 12 that covers covering 14 attractive in appearance from the outer surface of preheating is set about.First molded parts 16 has a working face 18, and its shape is equivalent to the curved end part 8 of handle 4.Two slide blocks 20 can slide between the position of the idle position of Fig. 3 and Fig. 4 work, and working face 22 is separately arranged, and when the position of Fig. 4 work, are connected with the working face 18 of first molded parts 16.

Equipment also contains second molded parts 24, with respect to first molded parts 16, slides between the position of two work shown in Fig. 3 and Fig. 4.Second molded parts 24 has a molded surface 26, is intended to advance facing to the inner surface portion of sheet material 12.Have one or more seats to be used to place corresponding fixture 28 on the molded surface 26 of molded parts 24, each fixture is made of the sheet metal with fixing fitting 30, and screw 32 is installed on the sheet metal.

Pipeline 34 in second molded parts 24 (not shown) that links to each other with compressed air source.Pipeline 34 is communicated with a series of holes 36 near on the outer surface at its top of parts 24.

After fixture 28 had been placed on the corresponding seat, thermoplastic sheet material 12 was supporting with semi plastic stage at second molded parts 24 top.Cladding material sheet material 14 extends on sheet material 12.Then second molded parts 24 horizontal stroke moved along first block part 16, make sheet material 12 move facing to the surface 18 of first molded parts 16.Cover sheets 14 remains on working face 18 and sheet material 12 outer surfaces between the two like this.

Allow two slide blocks 20 be in as shown in Figure 4 operating position then.Under this position, slide block 20 limits two cavitys 38 with undercut cross section, and they wrap a part of 12a of sheet material 12 and covering 14 corresponding parts and hole 36 separately, and hole 36 is used to provide compressed air.When slide block 20 when the position of Fig. 3 slides into the position of Fig. 4, the end of they and sheet material 12 is together with each other.Handle 4 flows to into zone 38 by the powerful compressed air that provides by means of pipeline 34 and hole 36, makes the thermoplastic sheet material 12 that is heated be pressed onto the

molded surface

18 and 22 of first molded parts and slide block 20.The pressure of the inner surface of 24 pairs of sheet materials 12 of second molded parts generation simultaneously makes the fixing fitting 30 of fixture 28 insert 12 li of sheet materials.

Compressed air stream does not need to adopt mechanical parts to produce necessary briquetting pressure at the inner surface of sheet material, just can produce the desired undercut cross section of handle 4, thereby has avoided the undue complexity of mold apparatus.By allow slide block 20 be returned to they when Fig. 3 the position and second molded parts 24 removed from first molded parts 16, simply the parts of making are taken out.After sheet cools, covering 14 is securely fixed in the outer surface of sheet material, and fixture or part 28 remain fixed in the inner surface of sheet material 12.Fixture 28 will be used for fixing handle to liner plate 2, if but handle and liner plate formation one just needn't be used fixture.

Technology described above also is particularly conducive to along the periphery of liner plate 2 and forms an edge of holding up.As shown in Fig. 5 and Fig. 6, with above-described corresponding parts with same reference number representation, slide block 20 can slide along the direction perpendicular to molded

parts

16 and 24 mold closings between the operating position of the operating position of Fig. 5 and Fig. 6.

When the position of Fig. 5, slide block 20 limits cavitys 38, surrounds a part of 12a and the hole 36 of sheet material 12 peripheries, and hole 36 provides compressed air stream, makes sheet material 12 be pressed onto the

molded surface

22 and 18 of slide block 20 and molded parts 16.

By several slide blocks that provide along the equipment periphery, can be enough simple, inexpensive mold apparatus produces an edge of holding up along the whole periphery of liner plate 2.

Claims

1, equipment is used to produce the parts of being made by thermoplastic and have undercut cross section, handle especially for arrangements for automotive doors, equipment contains and has its working surface (18) shape corresponding to the molded parts of making a member outer surface part (16), the sheet material of preheating (12) advances facing to it, it is characterized in that, it contains at least one movable member (20 that is used to limit the cavity (38) with undercut cross section, 24), and the time marquis who is using, it surrounds a part and the device (36) of desiring molding sheet material (12), device (36) is used to provide compressed air, and its mode makes the part distortion that makes the sheet material (12) that is surrounded by cavity (38) by compressed air stream.

2, according to the equipment of claim 1, it is characterized in that, it contains at least one slide block (20) that can slide in operating position and inoperative position between the two, and slide block has work molded surface (22), and this molded surface is facing to the part of the sheet material outer surface of pressurized stream of compressed air pressurization.

According to the equipment of claim 2, it is characterized in that 3, compressed air generator (36) carrier band has on second molded parts (24) of molded surface (26), profiled surface (26) faces toward the part of sheet material (12) inner surface in use.

According to the equipment of claim 3, it is characterized in that 4, it contains two slide blocks (20), the edge that is used to make the sheet material (12) that exceeds molded parts (16) working surface (18) toward each other bending.

According to the equipment of claim 4, it is characterized in that 5, in their operating position, slide block (20) forms cavity (38) with second molded element (24) effect.

According to the equipment of claim 3, it is characterized in that 6, second molded parts (24) has one to be used for being placed on the seat that its forming process is fixed to the fixture (28) in the sheet material inner surface.