US3706550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a metal die or mold
Assignee: Toyota Central R&D Labs Inc
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Filing: 1970-09-15
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Granted: 1972-12-19
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Expires: 1990-09-15
Abstract
Abstract A method for producing a metal die or mold including the steps of placing a layer of sintering powder, such as iron, copper, tungsten carbide or titanium carbide, in a frame or box, placing in contact with the sintering powder a pattern made of an infiltrant metal, such as copper, lead, cobalt, nickel, iron or alloys thereof, having a lower melting point than that of the sintering powder, the pattern corresponding in configuration to that of the cavity surface of the desired die, heating the powder together with the pattern in the frame to sintering temperature, whereby to sinter the powder and infiltrate the infiltrant metal forming the pattern into the powder, and cooling so as to obtain a hardened sintered mold having a surface whose configuration complements that of the pattern surface.
Inventors
- 👤 Hanji Umehara
- 👤 Takashi Kimura
- 👤 Hiroshi Hamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:49
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/06; B22C9/061; B22F; B22F5/00; B22F5/007; B22F5/10; B22F2005/103; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12451
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
29 words
A method of producing a metal die or mold according to claim 1, wherein further comprising removing said hardened and sintered die or mold from said frame after cooling.
Claim 2
Dependent Claim
45 words
A method according to claim 1, wherein said sintering powder is ferrous metal powder selected from the group consisting of iron powder and iron-carbon powder, and said pattern is made of one metal selected from the group consisting of copper, copper-manganese alloy, and copper-cobalt alloy.
Claim 3
Dependent Claim
37 words
A method according to claim 1, wherein said sintering powder is copper powder or copper alloy powder, and said pattern is made of one metal selected from the group consisting of lead, lead-tin alloy, and lead-cadmium alloy.
Claim 4
Dependent Claim
35 words
A method according to claim 1, wherein said sintering powder is tungsten carbide powder and said pattern is made of one metal selected from the group consisting of iron, cobalt, nickel and the alloy thereof.
Claim 5
Dependent Claim
35 words
A method according to claim 1, wherein said sintering powder is titanium carbide powder and said pattern is made of one metal selected from the group consisting of iron, nickel, cobalt or the alloy thereof.
Claim 6
Dependent Claim
37 words
A method according to claim 1, wherein said sintering powder layer is presintered at a lower temperature than the melting temperature of the infiltrant metal forming said pattern before heating to sinter said sintering powder layer completely.
Claim 7
Dependent Claim
19 words
A method according to claim 1, wherein said powder layer is compressed before heating to sinter said powder layer.
Claim 8
Dependent Claim
60 words
A method according to claim 8, wherein a pressure medium layer of heat-resistant powder such as magnesia powder layer is placed on said sintering powder layer such that the upper surface is made plane, and said sintering powder is compressed through said pressure medium layer, then said pressure medium layer is removed before heating to sinter said sintering powder layer.
Claim 9
Dependent Claim
40 words
A method according to claim 1, wherein said pattern has a thin plate member surrounding said selected configuration part to be overspread on the upper surface of said sintering powder layer except the area covered by said selected configuration part.
Claim 10
Dependent Claim
36 words
A method according to claim 1, wherein said pattern has a core made of a heat-resistant material such as ceramic and covered by said infiltrant metal and said core is removed from the mold after sintering.
Claim 11
Dependent Claim
26 words
A method according to claim 1, wherein a heat-resistant parting agent is placed as a thin layer between said frame and said layer of sintering powder.
Claim 12
Dependent Claim
21 words
A method according to claim 12, wherein said heat-resistant parting agent is selected from the group consisting of alumina and magnesia.
Claim 13
Dependent Claim
29 words
A method according to claim 1, wherein said layer of sintering powder substantially completely surrounds said pattern whereby the completed mold has a configuration complementing that of the pattern.
Claim 14
Dependent Claim
88 words
A method according to claim 14, wherein a plurality of said patterns is provided in said frame, said powder is disposed in said frame about each of said patterns in a plurality of layers separated from one another by thin layers of infiltrant metal with a lower melting point than that of said sintering powder, whereby upon completion of sintering and cooling a plurality of metal molds is obtained constituting a set and which together have the configuration of the pattern immersed in said layers of sintering powder.
Claim 15
Independent Claim
209 words
A method for producing a set of metal dies or molds composed of a sintered body with a hardened mold surface, comprising making a first layer of sintering powder selected from the group consisting of iron, iron alloy, copper, copper alloy, tungsten carbide and titanium carbide in a frame for forming said sintered body, placing a heat-resistant parting agent as a thin layer on the upper surface of said first layer, placing a pattern having a surface of selected configuration made of infiltrant metal with a lower melting point than that of said sintering powder on said layer to contact said pattern surface with said first layer for shaping said first layer with a surface complementing said pattern surface, making a second layer of said sintering powder on said pattern and layer of parting agent to contact the remaining surface of said pattern with said second layer of sintering powder before heating for sintering, heating said first and second layers and pattern within said frame to a sintering temperature to sinter said powder and to infiltrate said infiltrant metal forming said pattern into said powder, and removing said hardened, sintered dies or molds from said frame after cooling so as to obtain a set of metal dies or molds.
Claim 16
Dependent Claim
52 words
A method according to claim 16 wherein said pattern has a thin plate member surrounding said selected configuration part, said thin plate member is disposed between the first and second layers of sintering powder and said thin layer of parting agent is placed between said first and second layers of sintering powder.
Claim 17
Dependent Claim
63 words
A method according to claim 16 wherein a plurality of patterns for guide portions having U-shaped section and being made of infiltrant metal with a lower melting point than that of said sintering powder are embedded between said first and second layer of sintering powder, whereby guide pins and holes are formed on the counter surfaces of the dies upon completion of sintering.
Claim 18
Dependent Claim
48 words
A method according to claim 17, wherein said sintering powder is ferrous metal powder selected from the group consisting of iron powder and iron-carbon powder, and said pattern and thin plate are made of one metal selected from the group consisting of copper, copper-manganese alloy, and copper-cobalt alloy.
Claim 19
Dependent Claim
45 words
A method according to claim 16, wherein said sintering powder is ferrous metal powder selected from the group consisting of iron powder and iron-carbon powder, and said pattern is made of one metal selected from the group consisting of copper, copper-manganese alloy, and copper-cobalt alloy.
Claim 20
Dependent Claim
35 words
A method according to claim 16, wherein said sintering powder is tungsten carbide powder, and said pattern is made of one metal selected from the group consisting of iron, cobalt, nickel, and the alloy thereof.
Claim 21
Dependent Claim
35 words
A method according to claim 16, wherein said sintering powder is titanium carbide powder and said pattern is made of one metal selected from the group consisting of iron, nickel, cobalt and the alloy thereof.
Claim 22
Dependent Claim
37 words
A method according to claim 16, wherein said sintering powder is copper powder or copper alloy powder, and said pattern is made of one metal selected from the group consisting of lead, lead-tin alloy, and lead-cadmium alloy.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |