Forming method for producing a composite part having a permanent magnet

Patent metadata

Field	Value
Publication number	US-11004601-B2
Application number	US-201815905189-A
Country	US
Kind code	B2
Filing date	Feb 26, 2018
Priority date	Mar 8, 2017
Publication date	May 11, 2021
Grant date	May 11, 2021

Abstract

The present disclosure relates to a forming method for producing a composite part for an operating member, the method comprising the steps: disposing at least one permanent magnet in an injection-molding tool, which defines a mold cavity, and a heat-conducting reinforcement, which extends along the permanent magnet and is in touching contact with the injection-molding tool, in each case at a predefined position of the mold cavity; overmolding the permanent magnet with molding material by introducing molding material into the mold cavity; forming the composite part having the at least one permanent magnet, the heat-conducting reinforcement and the molding material.

First claim

The invention claimed is:

1. A forming method for producing a composite part for an operating member, the method comprising:
disposing at least one permanent magnet in an injection-molding tool, which defines a mold cavity, and a heat-conducting reinforcement, which extends along the permanent magnet and is in touching contact with the injection-molding tool, in each case at a predefined position of the mold cavity;
overmolding the permanent magnet with molding material by introducing molding material into the mold cavity;
forming the composite part including the at least one permanent magnet, the heat-conducting reinforcement, and the molding material, wherein:
the heat conductivity of the reinforcement is greater than that of the permanent magnet; and
the permanent magnet is configured as a plate defining two main surfaces and the heat-conducting reinforcement has two metal sheets, each adjoining one of the main surfaces.

2. The method according to claim 1 , wherein the heat-conducting reinforcement is disposed adjacent to the permanent magnet.

3. The method according to claim 1 , wherein a thermally insulating intermediate layer is provided between the heat-conducting reinforcement and the permanent magnet.

4. The method according to claim 1 , wherein the heat-conducting reinforcement is made from a soft magnetic material.

5. The method according to claim 1 , wherein a pole direction of the permanent magnet is orientated perpendicularly to the main surfaces.

6. The method according to claim 1 , wherein the heat-conducting reinforcement and the permanent magnet are arranged in the mold cavity such that a touching contact between the molding material and the permanent magnet is formed only in some portions, and a touching contact between the molding material and the heat-conducting reinforcement is formed only in some portions.

7. The method according to claim 6 , wherein a surface area of the permanent magnet in touching contact with the molding material constitutes less than 10% of the permanent magnet's total surface area.

8. The method according to claim 7 , wherein a surface area of the reinforcement in touching contact with the molding material constitutes less than 30% of the permanent magnet's total surface area.

9. The method according to claim 1 , wherein the permanent magnet is disposed such that it forms a touching surface with the injection-molding tool.

10. The method according to claim 1 , wherein the reinforcement or the permanent magnet have an undercut or at least one through hole in order to counteract a demolding from the composite part.

11. The method according to claim 1 , wherein the molding material is a non-curable thermoplastic or a curable thermosetting molding material.

12. The method according to claim 1 , wherein the temperature of the injection-molding tool does not exceed a Curie temperature of the permanent magnet.

13. An operating member having at least a composite part, the composite part comprising:
a permanent magnet;
a heat-conducting reinforcement; and
a molding material, wherein:
the heat-conducting reinforcement is disposed so as to extend along the permanent magnet;
the heat-conducting reinforcement and the permanent magnet are arranged in the composite part such that a touching contact between the molding material and the permanent magnet is formed only in some portions, and a touching contact between the molding material and the heat-conducting reinforcement is formed only in some portions;
the heat conductivity of the reinforcement is greater than that of the permanent magnet; and

the heat-conducting reinforcement has two sheets, each of the sheets adjoining opposite sides of the permanent magnet.

14. The operating member of claim 13 , wherein a surface area of the permanent magnet in touching contact with the molding material constitutes less than 10% of the permanent magnet's total surface area.

15. The operating member of claim 13 , wherein a surface area of the heat-conducting reinforcement in touching contact with the molding material constitutes less than 30% of the permanent magnet's total surface area.

16. The operating member of claim 13 , wherein the molding material is a non-curable thermoplastic or a curable thermosetting molding material.

17. The operating member of claim 13 , wherein the heat-conducting reinforcement is made from a soft magnetic material.

18. The operating member of claim 13 , wherein an adhesive layer is provided between the heat-conducting reinforcement and the permanent magnet.

19. The operating member of claim 13 , wherein the permanent magnet is disposed such that it forms a surface of the composite part and the heat-conducting reinforcement or the permanent magnet have an undercut in order to counteract a demolding from the composite part.

Assignees

• Preh Gmbh

Inventors

• Kirsch René
• Lang kai

Classifications

• B29C45/14377 Primary

  using an additional insert, e.g. a fastening element · CPC title

• B29K2995/0013

  Conductive · CPC title

• H01F41/026

  protecting methods against environmental influences, e.g. oxygen, by surface treatment (magnetic particles with skin H01F1/061, H01F1/09, H01F1/24, H01F1/33 and G11B5/706) · CPC title

• B29C45/14778 Primary

  the article consisting of a material with particular properties, e.g. porous, brittle · CPC title

• B29C45/7331

  Heat transfer elements, e.g. heat pipes · CPC title