Tool for producing fiber-reinforced plastics components in the injection process

Patent metadata

Field	Value
Publication number	US-9944004-B2
Application number	US-201514925009-A
Country	US
Kind code	B2
Filing date	Oct 28, 2015
Priority date	Aug 1, 2013
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A tool for producing fiber-reinforced plastics components in the injection process has a receptacle for a plastics component, which receptacle is surrounded by a circumferential seal which is inserted into a groove formed in the tool. It order to devise such a tool with which a higher service life for the seal can be achieved, the invention provides a receptacle chamber as volume compensation.

First claim

What is claimed is:

1. A tool for producing fiber-reinforced plastic components in an injection process, the tool comprising:
a receptacle for a plastics component to be produced; and
a circumferential seal surrounding the receptacle, the seal having a circular portion adjoined by a non-circular portion, wherein
the seal is inserted into a groove formed in the tool, and
a receptacle chamber fluidly coupled with the receptacle is configured to provide volume compensation for injection material injected into the receptacle.

2. The tool according to claim 1 , wherein the receptacle chamber is delimited on one side by the tool and on another side by the seal.

3. The tool according to claim 2 , wherein
the tool comprises an upper tool part and a lower tool part, and
the receptacle chamber is delimited by the upper tool part, the lower tool part, and the seal.

4. The tool according to claim 1 , wherein
the tool comprises an upper tool part and a lower tool part, and
the receptacle chamber is delimited by the upper tool part, the lower tool part, and the seal.

5. A tool for producing fiber-reinforced plastic components in an injection process, the tool comprising:
a receptacle for a plastics component to be produced; and
a circumferential seal surrounding the receptacle, wherein
the seal is inserted into a groove formed in the tool,
a receptacle chamber fluidly coupled with the receptacle is configured to provide volume compensation for injection material injected into the receptacle, and
the receptacle chamber is configured to be curved in a domed manner on a tool side of the receptacle chamber.

6. The tool according to claim 3 , wherein the receptacle chamber is configured to be curved in a domed manner on a tool side of the receptacle chamber.

7. The tool according to claim 1 , wherein
a wall of the seal on a side facing the receptacle chamber is deformable,
in a case of an opened tool, the wall is substantially planar, and
in a case of a closed tool, the wall is curved in a domed manner toward the receptacle chamber, whereby the receptacle chamber has a substantially lunate or crescent shape.

8. The tool according to claim 6 , wherein
a wall of the seal on a side facing the receptacle chamber is deformable,
in a case of an opened tool, the wall is substantially planar, and
in a case of a closed tool, the wall is curved in a domed manner toward the receptacle chamber, whereby the receptacle chamber has a substantially lunate or crescent shape.

9. The tool according to claim 1 , further comprising a PTFE coating on a wall of the seal facing the receptacle chamber.

10. The tool according to claim 8 , further comprising a PTFE coating on a wall of the seal facing the receptacle chamber.

11. A tool for producing fiber-reinforced plastic components in an injection process, the tool comprising:
a receptacle for a plastics component to be produced; and
a circumferential seal surrounding the receptacle,
wherein the seal is inserted into a groove formed in the tool, and
a receptacle chamber is configured to provide volume compensation,
wherein a wall of the seal on a side facing the receptacle chamber is deformable,
in a case of an opened tool, the wall is substantially planar, and
in a case of a closed tool, the wall is curved in a domed manner toward the receptacle chamber, whereby the receptacle chamber has a substantially lunate or crescent shape, and
wherein the seal is configured to have:
the deformable wall that faces the receptacle chamber,
a circular portion, and
a portion having two parallel walls, a first of the two parallel walls adjoining one end of the circular portion on one side and transforming into a comparatively long convex portion that terminates at the deformable wall on the other side, a second of the two parallel walls adjoining another end of the circular portion on one side and, on the other side, transforming into a comparatively short portion that extends perpendicularly from the second parallel wall and which is adjoined by a concave region that is opposite the deformable wall,
the concave region and the deformable wall being interconnected at ends opposite the circular portion by a region formed of two unequal length portions that are outwardly curved in a domed manner.

12. The tool according to claim 11 , wherein the two unequal length portions are themselves interconnected by a relatively short portion that is curved inwardly in a domed manner and that is opposite a center of the circular portion.

13. The tool according to claim 12 , wherein on a side opposite the portion having the two parallel walls, the circular portion has a V-shaped clearance, a pointed end of the V-shaped clearance extending beyond a center of the circular portion.

14. The tool according to claim 11 , wherein on a side opposite the portion having the two parallel walls, the circular portion has a V-shaped clearance, a pointed end of the V-shaped clearance extending beyond a center of the circular portion.

15. The tool according to claim 1 , wherein the seal is made of EPDM or silicone.

16. A tool for producing fiber-reinforced plastic components in an injection process, the tool comprising:
a receptacle for a plastics component to be produced; and
a circumferential seal surrounding the receptacle,
wherein the seal is inserted into a groove formed in the tool, and
a receptacle chamber is configured to provide volume compensation,
wherein the seal is configured as a round or oval shaped rod,
wherein the tool comprises a lower tool part and an upper tool part,
wherein the lower tool part has a plunging edge on a side of the seal that faces away from the receptacle,
wherein in a case of a closed tool, the plunging edge projects beyond a lower edge of the upper tool part, and
wherein the tool further has a chamfer provided at a transition of the lower tool part to the groove.

17. The tool according to claim 16 , wherein the rod comprises a core formed of a first material and a surrounding jacket formed of a second material.

18. The tool according to claim 17 , wherein the jacket is formed of PTFE or PFA, and the core is formed of an elastomer.

19. The tool according to claim 17 , wherein the core has a diameter approximately half that of the rod.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Heim Bernhard
• Huber Stefan

Classifications

• B29C45/0005

  using fibre reinforcements · CPC title

• B29C45/37

  Mould cavity walls {, i.e. the inner surface forming the mould cavity, e.g. linings} · CPC title

• B29C70/48

  and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM] {, e.g. by vacuum} · CPC title

• B29K2827/18

  PTFE, i.e. polytetrafluoroethylene, e.g. ePTFE, i.e. expanded polytetrafluoroethylene · CPC title

• B29C45/2608 Primary

  Mould seals · CPC title