Method for producing plastic components, which have a high mechanical load-bearing capacity, with a correct final contour

Patent metadata

Field	Value
Publication number	US-2016368187-A1
Application number	US-201414901935-A
Country	US
Kind code	A1
Filing date	Jul 25, 2014
Priority date	Jul 26, 2013
Publication date	Dec 22, 2016
Grant date	—

Abstract

A method for producing plastic components, which have a high mechanical load-bearing capacity, with a correct final contour is disclosed. In the method an injection casting process is carried out in a first step using a thermoplastic molding compound in a closed tool consisting of a female die and a male die, a thermoplastic molding compound with a high viscosity being used in order to provide a sufficient seal of the tool or the cavity at the tool parting plane between the female die and the male die in comparison to a molding compound with an extremely low viscosity used in a second step. The cavity is increased prior to the second step such that the seal formed by the molding compound is fixed on or in the molding compound with the extremely low viscosity after said molding compound is injected and cured to such an extent that the molding compounds forms a composite component.

First claim

What is claimed is:

1 .- 12 . (canceled)

13 . A method for producing plastic components, which have a high mechanical load-bearing capacity, with a correct final contour, said method comprising:
in a first step, performing an injection casting process in a closed tool consisting of a female die and a male die using a first thermoplastic molding compound having a high viscosity, sufficient to create a seal of a cavity of the tool in a tool parting plane between the female die and the male die with respect to a second molding compound having a very low viscosity, used in a second step, prior to the second step, increasing the cavity is so that after injection and curing of the second molding compound, the seal formed by the first molding compound is fixed on or in the molding compound to such an extent that the first and second molding compounds form a composite component.

14 . The method of claim 13 , wherein the cavity is increased by adjusting at least one movable block or by associating the male die to another female die, or by an analogous change.

15 . The method of claim 13 , further comprising inserting a textile structure between the female die and the male die in an open state of the tool, wherein the first thermoplastic molding compound fixes the textile structure in form and position and/or creates a sufficient seal of the tool or of the cavity in the tool parting plane between the female die and the male die with respect to the second molding compound in a second step for impregnating the textile structure.

16 . The method of claim 13 , further comprising injecting a gas into the first thermoplastic material is used.

17 . The method of claim 13 , characterized in that the injecting around of the dry textile structure ( 5 ) with the thermoplastic plastic (K 1 ) takes place such that the textile structure ( 5 ) is partially or completely surrounded by the plastic (K 1 ) and is fixed in a frame-like manner.

18 . The method of claim 15 , wherein the inserted textile structure forms towards an edge of the cavity an empty space or gap which is adjustable in a defined manner, said space or gap being adjusted in dependence on a ratio of a flow path to wall thickness relationship of the first thermoplast to be processed, and to the existing sprue situation of the tool.

19 . The method of claim 13 , further comprising stamping or pressing of a circumferential sealing edge formed in the gap after the introduction of the first thermoplast into the cavity said stamping or pressing being implemented by a machine stamping or tool-integrated stamping technique.

20 . The method of claim 19 , wherein the stamping process is superimposed with the injection of the impregnation component.

21 . The method of claim 15 , further comprising injecting ribs and other functional elements of the component to be produced directly onto the textile structure.

22 . The method of claim 15 , wherein the textile structure is fixed in its position in the open state of the cavity by using special elements to prevent an undesired slipping or displacement of the textile structure.

23 . The method of claim 15 , wherein the special elements comprise needles or push-pull arrangements.

24 . The method of claim 15 , further comprising
injecting and curing in a separate cavity a thermoplastic material so as to form a structure having ribs and/or reinforcement elements and a seal in the tool parting plane from, wherein the structure, after opening the separate mould, remains in a mould half of the separate mold; associating a third mould half with the mould half of the separate mould; forming at least one further cavity with the third mold half; inserting a dry textile or a textile structure into the further cavity; closing the mould by means of the third tool half; and injecting the a plastic with low viscosity into the created cavity, in which the dry textile or the textile structure is situated.

25 . The method of claim 13 , wherein tolerances of the mould halves are selected by taking the shrinkage of the first thermoplast into consideration so that in a region of the seal of the tool a press fit is established between the tool steel and the first thermoplastic plastic component.

Assignees

• Krauss Maffei Tech Gmbh

Inventors

• Schneebauer Martin
• Wuertele Martin

Classifications

• B29C45/1635

  using displaceable mould parts, e.g. retractable partition between adjacent mould cavities · CPC title

• B29C45/0005 Primary

  using fibre reinforcements · CPC title

• B29C2045/1682

  preventing defects · CPC title

• B29K2105/0094

  having particular viscosity · CPC title

• B29C45/16

  Making multilayered or multicoloured articles {(B29C45/0062 takes precedence; feeding colouring materials into the injection unit B29C45/1816)} · CPC title