WO2017125303A1

WO2017125303A1 - Method for injection-moulding a plastics component, and plastics component

Info

Publication number: WO2017125303A1
Application number: PCT/EP2017/050519
Authority: WO
Inventors: Martin LIEFLÄNDER
Original assignee: Hoppe Kunststoffspritzerei Und Formenbau Gmbh & Co. Kg
Priority date: 2016-01-21
Filing date: 2017-01-12
Publication date: 2017-07-27
Also published as: DE202016100255U1

Abstract

The invention relates to a method for producing a plastics component (1), having the following steps of: injection-moulding (S1) a basic body (2) of the plastics component (1) with the aid of an injection mould (13), wherein, in order to form a hole (10) in the basic body (2), a pin-like core (14) of the injection mould (13) is encapsulated with a plastics material, injection-moulding (S2) a closure (7) of the plastics component (1) in order to close the hole (10), removing (S3) the core (14) from the hole (10) and closing the hole (10) with the aid of the closure (7).

Description

METHOD FOR INJECTION MOLDING OF A PLASTIC COMPONENT

AND PLASTIC COMPONENT

The present invention relates to a method for producing a plastic component and a plastic component produced by this method.

For producing bores and cavities in plastic components, it is known to use injection molding tools with movable cores. For the purpose of ^forming a bore in a plastic component, such a core is encapsulated with a molten plastic material and, after solidification of the plastic material, is pulled out of it. If a continuous, that is, open at both ends, the bore for the preparation of a certain radio ^¬ tionality must be sealed, in a further step Ver ^¬ circuit can be inserted into the bore. For example, a steel ball can be pressed into the hole for this purpose. The steel ball is pressed after the injection molding of the plastic component in the hole, for which purpose the art ^¬ material component and the steel ball are placed in a suitable mounting device. Against this background, it is an object of the present invention is to provide an improved method of manufacturing a plastic component for Availability checked ^¬ supply.

Accordingly, a method for producing a plastic component is proposed. The method comprises the steps ^ injection molding of a Ba ^¬ siskörpers of the plastic component with the aid of an injection mold, wherein a pin-shaped core of the is spray ^¬ casting tool molded with a plastic material for forming a bore in the base body, injection molding a closure of plastic component for closing the bore, Remove the core from the hole and close the hole with the help of Ver ^¬ circuit. The plastic component may also be referred to as a plastic injection-molded component. To close the bore, the closure can be moved by means of a slider of the injection molding tool. The plastic material may be any thermoplastic plastic material. The plastic material can be reinforced with fibers, in particular glass fiber reinforced or carbon fiber-reinforced ^¬ be. The bore may also be referred to as an opening, recess or opening. The hole is open on both sides, that is, it penetrates the base body. Preferably, the bore has a circular cross-section. However, the bore can also have a rectangular, triangular or any cross section. Characterized in that the closure is preferably produced together with the base body before ^¬, can also be an additional component, such as a steel ball, will be omitted. By dispensing with the steel ball, the costs for the steel ball and the installation of the same can be saved. Furthermore, assembly errors during assembly of the steel ball can be excluded.

According to one embodiment, the injection molding of the base body and the injection molding of the closure are performed simultaneously. Preferably, the base body and the closure are made of the same plastic material. In particular, the injection molding tool has a cavity which forms a common negative form of the base body and the Ver ^¬ circuit. According to a further embodiment, the injection molding of the Basiskör ^¬ pers, the injection molding of the closure, removing the core and the Ver be ^¬ close the bore using the same injection mold performed.

This can be dispensed with additional tools or additional manufacturing steps. Preferably, the injection molding tool has at least two mold halves, which form a negative of an outer geometry of the plastic component. It can be a variety of different cores or sliders provided be. The core (s) and slide (s) can be moved into and out of the mold halves of the injection molding tool and form a cavity of the injection molding tool with the mold halves. The cavity is a negative of the plastic component and is filled with the molten plastic material to form it.

According to a further embodiment, the closure is manufactured in one piece with the base body. Under a materialeinstückigen connection is a cohesive connection to understand in which both the closure and the base body are made of the ^¬ same material and are firmly connected. Alternatively, the closure can be ^¬ gefer Untitled as a separate component independent of the base body.

According to a further embodiment, the closure is connected by means of a plastic film material integral with the base body.

The plastic film can also be referred to as a plastic film. In the injection molding tool, a thin spot is preferably provided, through which the molten plastic material can flow from the base body into the closure or vice versa. The thin spot forms the plastic film. The plastic film may be provided circumferentially around the closure. The art ^¬ material movie can be broken like a bridge. The plastic film may have, for example, a thickness of 0.05 to 0.2 mm.

According to a further embodiment of the closure before or during the closure of the bore of the base body is separated, in particular abgebro ^¬ chen. Preferably, the closure is then separated from the base body when the closure is moved by means of the slider. The closure can be separated from the base body by tearing the plastic film. According to another embodiment the bore is made so that the ^¬ se has a nozzle at a first end portion being attached to a second end portion of the bore of the closure.

The nozzle may preferably act as a Venturi nozzle. When making the hole this is open on both sides. For the functionality of the nozzle, it is particularly necessary that the bore is closed at the second end portion. Since a diameter of the nozzle is preferably significantly smaller than an inner diameter of the bore ^¬ hole, the core can be removed from the mold only by the second end portion. A one-sided closing of the bore at the second end portion is therefore not possible directly in the injection molding of the plastic component. For this reason, the second end portion is preferably closed immediately after injection molding in the injection mold by means of Ver ^{¬ circuit} . According to a further embodiment, the base body is manufactured so that it has a receiving portion for receiving the closure.

The receiving portion is preferably cylindrical. In particular, the closure is cylindrical. Preferably, the receiving portion and the closure each have a circular cross-sectional geometry. However, the on ^¬ acceptance section and the shutter can also have any other cross-sectional geometry. The closure may have a tubular Man ^¬ telabschnitt and a centrally on and perpendicular to the shell portion angeord ^¬ designated intermediate wall. On both sides of the intermediate wall, a frusto-conical recess may be provided on the closure. As a result, plastic material can be saved during the production of the closure and material shrinkage due to excessive material accumulation can be prevented.

According to a further embodiment, a central axis of the bore is arranged perpendicular to a central axis of the receiving portion.

As a result, it is reliably prevented even at pressure peaks that the Ver ^¬ conclusion is pushed out of the receiving portion, as the pressure along the central axis of the bore and thus acts perpendicular to the central axis of the receiving portion.

According to a further embodiment of the closure and the on ^¬ acquisition sections are made so that an outer diameter of closure RESIZE ^¬ SSER than an inner diameter of the receiving portion.

As a result, the closure can be pressed into the receiving section. Preferably then there is an interference fit. In this way, on the one legal ^¬ ensure that the closure is securely received in the receiving portion and thereby a fluid-tight closure of the bore is achieved on the other.

According to a further embodiment, the closure is pressed into the receiving ^¬ section.

In this case, the closure is pressed into the receiving section with the aid of the slide of the injection molding tool. When the closure is pressed into the receiving section, the closure and / or the receiving section are preferably elastically deformed. As a result, a radial bias of the closure is achieved in the receiving portion. This ensures the sealing ^{¬ unit} . By radial is presently understood to mean a direction perpendicular to the central axis of the receiving portion. Furthermore, a plastic component with an injection-molded base body having a bore, and an injection-molded closure for Ver ^¬ close the hole proposed, the closure for closing the bore of an initial state in which the bore is open on both sides, in a final state, in the bore is closed on one side, relative to the base body is displaced.

The hole is made using the core of the injection molding tool. In the initial state of the shutter in particular outside of the receiving portions is disposed in the final state of the closure, particularly in ^¬ nerhalb of the receiving portion is arranged.

According to one embodiment, the closure is embodied in one piece with the base body, the closure being detachable, in particular breakable, from the initial state to the final state from the base body during the displacement.

Preferably, the closure with the aid of the plastic film with the Basisiskör ^¬ per firmly connected and integral with this material formed. That is, the closure and the base body are manufactured together in the Spritzgusswerk ^¬ convincing.

According to a further embodiment, the closure is cylindrical and can be pressed in to close the bore in a cylindrical receiving portion of the base body.

Preferably, the outer diameter of the closure is at least slightly larger than the inner diameter of the receiving portion, whereby a secure fit of the closure is ensured in the receiving portion. Preferably, the closure is seated in the receiving portion such that the closure can be removed from the receiving portion only by destroying it. According to a further embodiment, a center axis of the bore is arranged perpendicular ^{¬ perpendicular} to a central axis of the receiving portion. Preferably, a central axis of the shutter is arranged coaxially with the central axis of the receiving portion. In the present case, an angle of 90 ° + / ^■ 10 °, more preferably of 90 ° +/- 5 °, more preferably of 90 ° +/- 1 °, more preferably of exactly 90 °, is to be understood as being perpendicular. Other possible implementations of the method and / or the plastic component ^¬ include not explicitly mentioned combinations of above or below with respect to the embodiments described features or embodiments. In this case, the expert will also add individual aspects as IMPROVE ^¬ deductions or additions to the respective basic form of the process and / or the plastic component.

Further advantageous embodiments and aspects of the method and / or of the plastic component are the subject matter of the subclaims and the exemplary embodiments of the method and / or the plastic component described below. In addition, the method and / or the plastic component to be explained in more detail by means of preferred embodiments with reference to the accompanying ^¬ Fi gures.

Fig. 1 shows a schematic perspective view of an embodiment of a plastic component;

FIG. 2 shows a schematic sectional view of the plastic component according to FIG. 1; FIG. 3 shows a schematic detail view of the Fig.% Fig. 4 is another schematic sectional view of the plastic component shows ge ^¬ Mäss Figure l. and

5 shows a schematic block diagram of an embodiment of a method for producing the plastic component according to FIG. 1.

In the figures, identical or functionally identical elements have the same reference numbers have been provided ^¬ Be, unless otherwise specified. 1 shows a schematic perspective view of a Kunststoffbau ^¬ part 1. The plastic component 1 may be a housing of a suction jet pump or a so-called jet pump. Suction jet pumps are used for example for the promotion of automotive fuels. Such suction ^¬ jet pumps operate on the principle of a venturi.

The plastic component 1 is preferably made of a thermoplastic plastic material in an injection molding process. The plastic component 1 comprises a base body 2 with a plate-shaped base portion 3, which may have a circular cross-section. On the upper side of the base section 3, two connection sections 4, 5 are provided. The ^{Anschlußabschnit ¬} te 4, 5 may be arranged instead also vertically and horizontally. The number of connection sections 4, 5 is arbitrary. Perpendicular to the connection sections 4, 5, a further connection section 6 is provided. The base body 2 can also have any other geometry. The plastic component 1 furthermore comprises a closure 7, the function of which will be explained below.

FIGS. 2 to 4 each show the plastic component 1 in a sectional view, wherein FIG. 3 is an enlarged detail view of FIG. 2. The plastic ^component 1 can be produced by means of a method according to FIG. 5. In the following, reference will be made to FIGS. 2 to 5 at the same time. The connection section 6 is tubular and has on the inside a recess or bore 8. In the bore 8 projects a nozzle 9 into it. Coaxial with the bore 8, a further recess or bore 10 is provided in the base body 2. The bore 10 comprises a first end portion 11, on which the nozzle 9 is provided, and a second end portion 12, which the shutter 7 is associated. The plastic member 1, that is, the base body 2 and the shutter 7 are together and in particular simultaneously in a plastics injection molding tool ^¬ or injection molding tool 13 by the method shown in Fig. 5 was prepared.

The injection molding tool 13 is shown greatly simplified in FIG. 2. The injection molding tool 13 may, for example, have two mold halves which form a negative of an outer geometry of the plastic component 1. The injection-molded ^¬ tool 13 may further ^comprise at least one pin-shaped core 14 for forming the bore 10. The injection molding tool 13 can have a multiplicity of different ^{types of} cores. For example, the injection molding tool 13 may also include a core for forming the bore 8. To form the bore 10 in the base body 2, the core 14 is overmolded with the plastic material and after the solidification of the same pulled out of this.

The injection molding tool 13 may further have a movable slide 15 on ^¬ . The core 14 and the slider 15 are moved out into the mold halves of the injection ^¬ molding tool 13 into and out of this and, with the mold halves, a cavity of the injection mold 13. The cavity is a negatively the plastic component 1 and is used to form the plastic component 1 with filled with molten plastic material. As FIG. 3 shows, comprises the Ver ^¬ circuit 7 has a cylindrical geometry with a circular basic cross section on ^¬ and an outer diameter d _7. The closure 7 has a cylin ^¬ derförmigen shell portion 16 and a perpendicular to the shell portion 16 positioned intermediate wall 17. On the upper side and underside of the intermediate ^¬ wall 17 each have a frusto-conical recess 18, 19 is provided. By providing the frusto-conical recesses 18, 19 can Plastic material can be saved, warping of the closure 7 can be avoided during cooling of the plastic material and elastic Ver ^¬ formability of the closure 7 can be facilitated in the radial direction. At the second end portion 12 of the bore 10, a cylindrical receiving section 20 ^{¬ is} provided. A center axis M20 of the receiving portion

20 or a central axis M _{7 of} the closure 7 is positioned perpendicular to egg ^¬ ner central axis Mio of the bore 10. The receiving portion 20 and the closure 7 may have a circular, square, oval, polygonal or any cross-section. However, the Aufnahmeab ^{¬ section} 20 and the shutter 7 preferably have a circular cross-section. An inner diameter D 2 O of the accommodation portion 20 is at least slightly smaller than the outer diameter d ₇ of the cap 7. Furthermore, the In ^¬ nendurchmesser D2O of the receiving portion 20 is larger than an inner diameter dio of the bore 10. The receiving portion 20 and the bore 10 are arranged so in that the receiving portion 20 intersects the bore 10.

For the functionality of the plastic component 1 and in particular the nozzle 9, it is necessary that the bore 10 is closed at the second end portion 12. Since a diameter of the nozzle 9 is considerably smaller than the inner diameter ^¬ dio of the bore 10, the core 14 may only through the second end portion ^¬ be pulled out of the bore 10 12th A one-sided Ver ^¬ closing the bore 10 at the second end portion 12 is thus not possible during the injection molding of the plastic component 1. For this reason, the second end portion 12 is sealed immediately after the injection molding in the injection molding ^¬ tool 13 by means of the shutter 7.

For this purpose, the shutter 7 by means of a thin spot or a plastic film

21 integrally connected to the base body 2. During injection molding of the plastic component 1, the molten plastic material can flow from the base body 2 into the closure 7 or vice versa through a thin spot in the injection molding tool 13 corresponding to the plastic film 21. For this purpose, one or more injection nozzles may be provided on the base body 2 and / or on the closure 7.

The closure 7 is, as shown in FIGS. 2 and 3, in the injection molding tool 13 with the aid of the slider 15 from an initial state AZ, in which the Boh ^¬ tion 10 is open on both sides, in a final state EZ displaced, in which the Boh ^¬ tion 10 on one side, that is, on the side of the second end portion 12, ver ^{¬ is} closed. For this purpose, the shutter 7 is pressed by means of the slider 15 after pulling out of the core 14 in the receiving portion 20. In this case, the shutter 7 is in the displacement from the initial state in the AZ Endzu ^¬ EZ stand from the base body 2 thus separated, that the plastic film breaks 21 or breaks.

In the method for manufacturing the plastic component 1 according to Fig. 5, in a step Sl, the base body 2 is injection ^¬ poured by means of the injection molding tool 13, being extrusion-coated to form the bore 10 in the base body 2 of the stiftförmi- ge core 14 with the plastic material , In a step S2, the closure 7 is injection-molded for closing the bore 10 with the aid of the injection molding tool 13. The steps S1 and S2 can be carried out simultaneously in the same injection molding tool 13.

In a step S3, the core 14 is removed from the bore 10. For this purpose, the core 14, as shown in Fig. 2 by means of an arrow 22, pulled out of the bore 10. At this time, the plastic material is already cooled down so far that the bore 10 maintains its shape. With the core 14 and the nozzle 9 is formed on the bore 10. In a step S4, the bore 10 is closed on one side, that is to say on the side of the second end section 12, by means of the closure 7. The steps S 1 to S 4 can all be carried out with the aid and in the same injection molding tool 13. As a result, additional assembly steps can be omitted. In the injection molding of the base body 2 and the shutter 7 of the Ver ^¬ circuit 7 is materially in one piece with the base body 2, wherein the Ver ^¬ circuit 7 by means of the plastic film 21 is connected materially in ^¬ per 2 with the Basiskör. In the step S4, the shutter 7 is separated from the base body 2 before or during the closing of the bore 10. In particular, the closure 7 is broken off or torn off by the base body 2. Here, the plastic film 21 is destroyed.

To close the bore 10, the shutter 7 is pressed into the receiving portion 20 with the aid of the slider 15. For this purpose, the slider 15 is moved in the direction of the shutter 7, as shown in FIG. 2 by means of an arrow 23. The slider 15 can engage in the recess 18 of the closure 7. The fact that the outer diameter d _{7 of} the closure 7 is greater than the inner diameter d 2o of the receiving portion 20, the closure 7 can be pressed into the receiving portion, whereby a secure fit of the closure 7 is ensured in the receiving portion 20 and a fluid-tight seal of the second end portion 12 of the bore 10 ensures ^¬ is. When the closure 7 is pressed into the receiving section 20, the closure 7 and / or the receiving section 20 can deform elastically. As a result, a radial bias of the closure 7 in the receiving portion 20 is achieved. By radial is here a direction perpendicular to the central axes M ₇ , M20 to understand.

The fact that the central axis M _{7 of} the closure 7 or the central axis M20 of the receiving portion 20 is arranged perpendicular to the center axis Mio of the bore 10, even at high pressures ensures that the closure 7 is not pushed out of the receiving portion 20, as the pressure in the direction of the center axis Mio and thus perpendicular to the central axes M ₇ , M ₂₀ acts.

Although the present invention has been described on the basis of ^exemplary embodiments, it can be varied in many ways. LIST OF REFERENCE NUMBERS

1 plastic component

2 base bodies

3 base section

4 connection section

5 connection section

6 connection section

7 closure

8 hole

9 nozzle

10 hole

11 end section

12 end section

13 injection mold

14 core

15 slides

16 shell section

17 partition wall

18 recess

19 recess

20 receiving section

21 plastic film

22 arrow

23 arrow

AZ initial state d ₇ outer diameter dia inner diameter d20 inner diameter

EZ final state

M ₇ central axis Mio central axis

M ₂₀ central axis

51 step

52 step S3 step

S4 step

Claims

1. A method for producing a plastic component (1), comprising the following steps:

Injection molding (Sl) of a base body (2) of the plastic component (1) with the aid of an injection mold (13), wherein for forming a bore (10) in the base body (2) a pin - shaped core (14) of the injection molding tool (13) with ei ^¬ nem plastic material is injected,

Injection molding (S2) of a closure (7) of the plastic component (1) for closing the bore (10),

Removing (S3) the core (14) from the bore (10), and

Closing (S4) the bore (10) by means of the closure (7).

2. The method of claim 1, wherein the injection molding (Sl) of the base body (2) and the injection molding (S2) of the closure (7) carried out simultaneously who ^¬ .

3. The method according to claim 1 or 2, wherein the injection molding (Sl) of the base ^¬ body (2), the injection molding (S2) of the closure (7), the removal (S3) of the core (14) and the closing (S4) the bore (10) by means of the same injection molding tool (13) are performed.

4. The method according to any one of claims 1-3, wherein the closure (7) rialeinstückig with the base body (2) is manufactured.

5. The method according to claim 4, wherein the closure (7) by means of a plastic film ^¬ (21) material integral with the base body (2) is connected.

6. The method of claim 4 or 5, wherein the closure (7) before or at the closing (S4) of the bore (10) of the base body (2) separated, in particular ^¬ special broken off, is.

7. The method according to any one of claims 1-6, wherein the bore (10) is so gefer ^¬ taken that this at a first end portion (ll) has a nozzle (9) and wherein at a second end portion (12) of the bore ( 10) the closure (7) is attached.

8. The method according to any one of claims 1-7, wherein the base body (2) is made so that it has a receiving portion (20) for receiving the closure (7).

9. The method of claim 8, wherein a central axis (Mio) of the bore (10) perpendicular to a central axis (M20) of the receiving portion (20) is arranged.

10. The method of claim 8 or 9, wherein the closure (7) and the receiving portion (20) are made so that an outer diameter (d ₇ ) of the

Closure (7) is greater than an inner diameter (d2o) of the receiving portion (20).

11. The method according to any one of claims 8 - 10, wherein the closure (7) in the receiving portion (20) is pressed.

12. plastic component (1) with:

an injection molded base body (2) having a bore (10), and

an injection molded closure (7) for closing the bore (10), said closure (7) for closing the bore (10) from an off ^¬ transition state (AZ), in which the bore (10) is open on both sides, in a Endzu ^¬ stand (EZ), in which the bore (10) is closed on one side, relative to the Ba ^¬ siskörper (2) is displaced.

13. Plastic component according to claim 12, wherein the closure (7) is material integrally formed with the base body (2) and wherein the closure (7) at the shift from the initial state (AZ) in the final state (EZ) of the base body (2) separable, in particular breakable, is.

14. Plastic component according to claim 12 or 13, wherein the closure (7) zylin ^¬ derförmig and for closing the bore (10) in a cylindrical receiving portion (20) of the base body (2) can be pressed.

15. Plastic component according to claim 14, wherein a central axis (Mio) of the bore ^¬ tion (10) perpendicular to a central axis (M20) of the receiving portion (20) is arranged on ^¬ .