CN101484293B

CN101484293B - Method for producing a plate-shaped plastic part

Info

Publication number: CN101484293B
Application number: CN2007800254025A
Authority: CN
Inventors: 托尔斯滕·瓦勒尔
Original assignee: Continental Automotive GmbH
Current assignee: Continental Automotive GmbH
Priority date: 2006-07-03
Filing date: 2007-05-31
Publication date: 2011-12-07
Anticipated expiration: 2027-05-31
Also published as: WO2008003557A1; DE102006030659B3; BRPI0713542A2; CN101484293A

Abstract

The invention relates to a method for producing a plate-shaped plastic part (1) with two at least approximately parallel plate surfaces (2) and (3), made of a soft elastomer material, with an incision-like slit which at least mostly penetrates the plastic part (1), and which runs perpendicular to the plane of said plastic part (1), and which automatically closes as a result of the elasticity of the material. During this process, the plate-shaped plastic part (1) is produced in a cavity (13) of a two-part injection molding tool (6) by means of injection molding. After the injection molding of the plate-shaped plastic part (1), the injection molding tool (6) is opened, and the plastic part (1) remains in the first part (7) of the injection molding tool in such a way that said plastic part (1) is supported on one of the plate surfaces (2) thereof, that the second plate surface (3) thereof is exposed, and that a blade (20) is moved towards the exposed plate surface (3) and penetrates the plastic part (1), cutting the slit (5) into the plastic part (1).

Description

Be used to make the method for plate-shaped plastic part

Technical field

The present invention relates to a kind of method that is used to make plate-shaped plastic part, this plastic components has two mutual approximately parallel at least plate faces and is made by soft, elastomeric material, and has a slit transverse to the incision-like of the plate face of plastic components, this slit passes plastic components at least to a great extent and passes through the elasticity auto-closing of the material of this plastic components, wherein produces plate-shaped plastic part by injection moulding in the die cavity of the injection moulding tool that two parts constitute.

Background technology

In order to make such plastic components, must carry out two PROCESS FOR TREATMENT.At first must make plastic components, produce slit subsequently by injection moulding.

Utilize injection moulding to produce the suitable injection moulding tool that slit need have the core that is used for slit simultaneously, the elasticity of the enough materials by plastic components reliably of this slit and closed independently.

By a kind of method that starts described type of DE 197 20 937 A1 cicada.

By " Michaeli; W.et al " One-Shot ManufacturingProzessintegration in der Kunststoffverarbeitung " Kunststoffe (plastics); Nr.10; 1998; Seiten (page or leaf) 1784-1788, XP00193971 " known procedure of processing such as installation, decoration and the packing that will come from the field of injection molding machine transfer in the injection moulding tool.

By JP 2,005 149730 A a kind of plate-shaped plastic part with slit of elastic closure of cicada, chip card can pass this slit.This slit has the projection of protruding transverse to the passing face of chip card, and water droplet should be wiped from chip card by this projection.

Summary of the invention

Therefore the objective of the invention is to, propose a kind of simple method that starts described type, generation has the plate-shaped plastic part of the slit of auto-closing reliably in the method.

This purpose is solved by following method according to the present invention, promptly plate-shaped plastic part is being carried out opening injection moulding tool after the injection moulding, wherein plastic components rests in first parts of injection moulding tool in this wise, be plastic components supported and its second plate face exposes at an one plate face place, and cutting edge is towards the plate face motion that exposes with penetrate in the plastic components and slit is opened in the plastic components.

Rest on by the injected plastic components that finishes in the parts of injection moulding tool to be used to produce slit, no longer need to take out and reorientate injected part thus.

Producing slit by means of cutting edge causes: slit is so-called zero otch (Nullschnitt) and the therefore elasticity of the material by plastic components and safety and auto-closing reliably.

With the parts of card-like for example chip card pass under the situation of slit, the parts of this card-like are also besieged, wiped so that dust and/or moisture pass at the parts of card-like under the situation of slit.

Avoided so additional operation, promptly to make by soft material and therefore can only handle by automated difficultly parts.

If this is arranged on closure that cutting edge on second parts of injection moulding tool utilizes injection moulding tool towards the plate face motion that exposes with penetrate in the plastic components, thereby slit is opened in the plastic components, then so also automatically utilize the closure of injection moulding tool and technology reliably and can make this slit with accurately duplicating.

Under the situation of injection moulding, plate-shaped plastic part is provided with in a side transverse to the plate face around the edge that protrudes in the mode of one, thereby has formed the over cap of opening in a side with rectangular cross section.

Being injection-moulded on first position of rotation of plate-shaped plastic part carried out, carry out on second position of rotation that is opened in the rotation injection moulding tool of slit, this rotation injection moulding tool can move at least two position of rotation rotatably, can force to carry out correspondence to always correct between the tool component in simple mode thus.

If carry out in injection moulding on first position of rotation and offering simultaneously of the slit on second position of rotation, then this manufacturing is rational especially.

As last step of manufacture method, after being offered, opens slit the plate-shaped plastic part that injection moulding tool and taking-up or release are made.

Cutting edge can pass completely through plate-shaped plastic part and produce through-slots.

But also may be, promptly cutting edge penetrates in the plastic components with a degree of depth, this degree of depth approximate at least with two plate faces between apart from corresponding consistent.

At this, the approximately last 1/100stel mm of plate-shaped plastic part may be not remaining dividually.If after this parts of this card-like pass slit for the first time, then this remaining coupling part also can be separated.

Therefore avoided cutting edge owing to first parts made by converted steel that strike injection moulding tool suffer damage under the situation in cutting edge incision plate-shaped plastic part.

Replacedly or replenish ground, also can flexibly support the surface of first parts of the injection moulding tool that is subjected to the cutting edge bump.

Preferably utilize the thermoplastic elastomer body to carry out injection moulding.

This material compare with pure elastomer be can heat fusing and can be injected in the injection moulding tool.After cooling, plastic components can be pushed out from injection moulding tool or take out.

Description of drawings

Embodiments of the invention shown in the drawings, and be illustrated in more detail below.

Accompanying drawing is depicted as:

Fig. 1: have perspective view around the plate-shaped plastic part at edge,

Fig. 2: according to the front view of the plastic components of Fig. 1,

Fig. 3: according to the vertical view of the plastic components of Fig. 1,

Fig. 4: according to the rearview of the plastic components of Fig. 1,

Fig. 5: along the sectional view of the line V-V in Fig. 2,

Fig. 6: the cross-sectional view of the two-part injection moulding tool in first method step,

Fig. 7: according to the view of first parts of the injection moulding tool of Fig. 6,

Fig. 8: according to the perspective view of the injection moulding tool of Fig. 6,

Fig. 9: the cross-sectional view in second method step according to the injection moulding tool of Fig. 6,

Figure 10: according to the view of first parts of the injection moulding tool of Fig. 9,

Figure 11: according to the perspective view of the injection moulding tool of Fig. 9,

Figure 12: the cross-sectional view in the 3rd method step according to the injection moulding tool of Fig. 6,

Figure 13: according to the schematic diagram of first parts of the injection moulding tool of Figure 12,

Figure 14: according to the perspective view of the injection moulding tool of Figure 12 and

Figure 15: the part figure " A " that comes from the amplification of Figure 12.

The specific embodiment

Comprise the plate-shaped plastic part 1 of rectangle at the over cap shown in Fig. 1 to 5 22, these parts have two

plate faces

2 and 3 that are parallel to each other.

Can draw, promptly one or two plate face also can the parallel deviate characteristic be concavity, convex or roof shape.

Along plate face 2 around the edge, on plastic components 1, formed the edge 4 that rectangle protrudes, formed over cap 22 thus.

Transverse to the plate face of plastic components 1, in plastic components 1, be parallel to its vertical side forms the incision-like of passing in the centre slit 5, as the so-called zero otch (Nullschnitt) that does not have the width extension.

Over cap 22 is made by soft, elastomeric plastic material, and makes in the injection moulding tool 6 that two parts constitute by injection moulding.

Injection moulding tool 6 has first parts 7 and second parts 8, its utilize their opposed facing 9 and 10 can be away from each other and closely motion, and second parts 8 can be round rotating with 180 °-step-length with this face 9 rotation 11 vertical with 10.

First parts 7 have the footpath make progress the opposed facing bossing 12 and 12 that protrudes from face 9 with meeting at right angles ', its profile is corresponding to the same with the interior zone of the over cap 22 that is surrounded by edge 4.

With bossing 12 and 12 ' corresponding to the same, in second parts 8, be formed with towards the

open die cavity

13 and 14 of face 10.

The outline of the profile of die cavity 13 and over cap 22 is corresponding to the same, and the profile of die cavity 14 has the degree of depth same with die cavity 13, but has the width bigger than die cavity 13.

Running channel 21 begins to pass to second parts 8 of injection moulding tool 6 from the side relative with face 10, and leads to die cavity 13.

Equally also be to begin from the side relative with face 10 to form groove 15 second parts 8, the cutting guide slot 17 of littler width passes to second die cavity 14 from the bottom 16 of this groove.

Groove 15 and cutting guide slot 17 have the length same with die cavity 14.

The cutting support 18 of identical cross-section is installed in the groove 15 regularly, is provided with cutting part 19 in the end towards face 10 of this support, and this cutting part is inserted in the cutting guide slot 17, and has cutting edge 20 in the end freely at it.This cutting edge 20 has the length same with die cavity 14, and to protrude from cutting guide slot 17 with the thickness of plate-shaped plastic part 1 size corresponding to the same and to be inserted in the die cavity 14.

In first method step, as it shown in Fig. 6 to 8, the part 7 of

injection moulding tool

6 and 8

face

9 and 10 mutually against, and plastics are injected in the die cavity 13 by running channel 21, bossing 12 is inserted in this die cavity.Produced over cap 22 this moment.

In second method step, the parts 7 of

injection moulding tool

6 and 8 with a distance be separated from each other and parts 7 around rotation 11 with 180 ° of rotations (seeing Fig. 9 to 11).Over cap 22 rests on the bossing 12, and sclerosis when cooling.

In the 3rd method step (Figure 12 to 15), the

parts

7 and 8 of injection moulding tool 6 lump together each other again up to face 9 and 10 mutually against.

This moment bossing 12 ' move in the die cavity 13, bossing 12 utilize the position thereon over cap 22 and move in the die cavity 14.

Mutually in the last part of before this motion, cutting edge 20 penetrates in the plate-shaped plastic part 1, and will offer slit 5 in plate-shaped plastic part 1 at

face

9 and 10.

In the same way, as plastics being injected in the die cavity 13 of defined in first method step, produced another over cap 22 thus.

After the

parts

7 and 8 with injection moulding tool 6 were separated from each other, the over cap 22 that possesses slit 5 was removed, and first parts 7 and second method step corresponding to the same around rotation 11 with 180 ° of rotations, then carry out the 3rd method step subsequently again.

In carrying out these three method steps respectively continuously, spray over cap 22 continuously and cut out slit 5.

Claims

1. method that is used to make plate-shaped plastic part, described plastic components has two mutual approximately parallel at least plate faces and by soft, elastomeric material is made, and has a slit transverse to the incision-like of the plate face of described plastic components, described slit passes the elasticity auto-closing of described plastic components and the material by described plastic components at least to a great extent, wherein in the die cavity of the rotation injection moulding tool that two parts constitute, produce described plate-shaped plastic part by injection moulding, it is characterized in that, after being carried out injection moulding, described plate-shaped plastic part (1) opens described rotation injection moulding tool (6), wherein said plastic components (1) rests on first parts (7) lining of described rotation injection moulding tool (6) in this wise, and second plate face (3) that promptly described plastic components is located supported and described plastic components at a plate face (2) of described plastic components exposes; Cutting edge (20) moves and penetrates in the described plastic components (1) and described slit (5) is opened in the described plastic components (1) towards the plate face (3) of described exposure, wherein, on second parts (8) of described rotation injection moulding tool (6) cutting edge (20) is set, the closure that described cutting edge utilizes described rotation injection moulding tool (6) is moved and is penetrated in the described plastic components (1) and described slit is opened in the described plastic components (1) towards the plate face (3) of described exposure.

2. method according to claim 1 is characterized in that, under the situation of injection moulding, along described plate face (2) around the edge, formed the edge (4) that rectangle protrudes at described plate-shaped plastic part (1) in the mode of one.

3. method according to claim 1 and 2, it is characterized in that, being injection-moulded on first position of rotation of described plate-shaped plastic part (1) carried out, carry out on second position of rotation that is opened in described rotation injection moulding tool (6) of described slit, described rotation injection moulding tool can rotatablely move at least two position of rotation.

4. method according to claim 3 is characterized in that, the injection moulding on first position of rotation and carry out offering simultaneously of second the above slit of position of rotation.

5. method according to claim 1 and 2 is characterized in that, opens described rotation injection moulding tool (6) and take out or release described plate-shaped plastic part (1) after offering described slit.

6. method according to claim 4 is characterized in that, opens described rotation injection moulding tool (6) and take out or release described plate-shaped plastic part (1) after offering described slit.

7. method according to claim 1 and 2 is characterized in that, described cutting edge (20) penetrates in the described plastic components (1) with a degree of depth, this degree of depth approximate at least with described two plate faces (2,3) between distance corresponding consistent.

8. method according to claim 6 is characterized in that, described cutting edge (20) penetrates in the described plastic components (1) with a degree of depth, this degree of depth approximate at least with described two plate faces (2,3) between distance corresponding consistent.

9. method according to claim 1 and 2 is characterized in that, utilizes thermoplastic elastomer (TPE) to carry out injection moulding.

10. method according to claim 8 is characterized in that, utilizes thermoplastic elastomer (TPE) to carry out injection moulding.