Patent US4779202A successfully refreshed from Google Patents.
US4231982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of tools for deep drawing, moulding, extruding and the like
Assignee: Volvo AB
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Filing: 1975-05-20
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Granted: 1980-11-04
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Expires: 1995-05-20
Abstract
Abstract An exact replica of a tool for deep drawing, moulding, extruding and the like is manufactured by a method according to the present invention by thermally spraying the wearing surface of the tool to be produced onto a negative replica of the tool to be produced, said last replica being constituted of an easily fusible metal with a lower melting point than the plastic material used for backing up (1) the easily fusible negative replica and (2) the thermally sprayed wearing surface of the tool. According to the method of the invention the wearing surface of the tool can be constituted of steel, carbide or oxide.
Inventors
- 👤 Hans B. E. Jansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:42
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/56; B29C33/565; B21; B21C; B21C25/00; B21C25/10; B21C3/00; B21C3/18; B21D; B21D37/00; B21D37/20; B22; B22C; B22C7/00; B23; B23P; B23P15/00; B23P15/24; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/507; B29C48/03; B29C48/07; B29C48/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
166 words
A method for producing tools for deep drawing, moulding, extruding and the like, comprising forming a working model having a surface the shape of the tool to be produced, coating said surface with a release agent, thermally spraying on said coated surface a thin layer of an easily fusible metal or metal alloy, backing said sprayed layer with a stiffener of heat-resistant plastic, loosening the working model from the sprayed metal layer stiffened with plastic, thermally spraying on said easily fusible layer a wearing layer of the material of the intended tool, to a depth substantially thicker than the depth of said easily fusible layer, backing the wearing layer with a plastic that withstands a temperature sufficiently high to fuse said easily fusible layer, heating the assembly of easily fusible layer and wearing layer and plastic backings to a temperature sufficiently high to fuse said easily fusible layer, and separating the wearing layer and its plastic backing from the easily fusible layer and its plastic backing.
Claim 2
Independent Claim
166 words
A method for producing tools for deep drawing, moulding, extruding and the like, comprising forming a working model having a surface the shape of the tool to be produced, coating said surface with a release agent, thermally spraying on said coated surface a thin layer of an easily fusible metal or metal alloy, backing said sprayed layer with a stiffener of heat-resistant plastic, loosening the working model from the sprayed metal layer stiffened with plastic, thermally spraying on said easily fusible layer a wearing layer of the material of the intended tool, to a depth substantially thicker than the depth of said easily fusible layer, backing the wearing layer with a plastic that withstands a temperature sufficiently high to fuse said easily fusible layer, heating the assembly of easily fusible layer and wearing layer and plastic backings to a temperature sufficiently high to fuse said easily fusible layer, and separating the wearing layer and its plastic backing from the easily fusible layer and its plastic backing.
Claim 3
Dependent Claim
27 words
A method as claimed in claim 1, said wearing layer consisting of a member selected from the group consisting of a metal, metal alloy, carbide and oxide.
Claim 4
Dependent Claim
14 words
A method as claimed in claim 1, in which said wearing layer is steel.
Claim 5
Dependent Claim
51 words
A method as claimed in claim 1, and reinforcing said plastic in the layer of plastic nearest said wearing layer with a member selected from the group consisting of silicon carbide, steel fiber, and carbon fiber, and reinforcing the remaining portions of the plastic of the wearing layer backing with quartz.
Claim 6
Dependent Claim
29 words
A method as claimed in claim 1, in which both plastic backings resist a temperature at least 20° C. higher than the fusion point of the easily fusible layer.
Claim 7
Dependent Claim
21 words
A method as claimed in claim 1, in which the plastic that backs said wearing layer is thermosetting at room temperature.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |