US3915699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing metal dies or molds containing cooling channels by sintering powdered metals
Assignee: Toyota Central R&D Labs Inc
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Filing: 1972-12-26
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Granted: 1975-10-28
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Expires: 1992-12-26
Abstract
Abstract A sintered metal die or mold having formed therein an internal channel for conducting a heat transfer medium therethrough, and a method for producing same. The method includes the steps of disposing sintering powder, such as iron, copper, tungsten carbide or titanium carbide, in a frame or box, about 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 channel for the heat transfer medium and being positioned within the sintering powder in the position desired for the channel, heating the powder together with the pattern 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 sintered metal die or mold having an internal channel 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
2026-10-29 18:37
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/24; B22F3/26; B22C; B22C9/00; B22C9/06; B22C9/061; B22F5/00; B22F5/10; B22F2005/103; B22F2998/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
193 words
A METHOD FOR PRODUCING A DIE OR MOLD FROM SINTERED POWDER MATERIAL AND HAVING AT LEAST ONE INTERNAL CHANNEL FORMED THEREIN FOR CONDUCTING A HEAT TRANSFER MEDIUM INTO, THROUGH, AND OUT OF THE MOLD, COMPRISING PLACING A FIRST LAYER OF SINTERING POWDER SELECTED FROM THE GROUP CONSISTING OF IRON, IRON-CARBON, COPPER, COPPER ALLOY, TUNGSTEN CARBINDE AND TITANIUM CARBIDE IN A FRAME, FORMING A MOTHER MOLD CONFORMING IN SIZE AND CONFIGURATION TO A DESIRED MOLD CAVITY, FORMING A PATTERN OF LONG AND SLENDER SHAPE HAVING A DESIRED SURFACE CONFIGURATION CORRESPONDING TO THAT OF SAID INTERNAL CHANNEL FOR CONDUCTING A HEAT TRANSFER MEDIUM AND WHICH COMPLEMENTS THE SURFACE OF THE DESIRED MOLD CAVITY, SAID PATERN BEING MADE OF METAL INFILTRATABLE INTO THE PORES OF SAID SINTERING POWDER AND HAVING A LOWER MELTING POINT THAN THAT OF SAID SINTERING POWDER, AT LEAST PARTIALLY EMBEDDING SAID MOTHER MOLD IN SAID LAYER OF SINTERING POWDER, ADDING A SECOND LAYER OF SAID SINTERING POWDER TO COMPLETELY EMBED THE MOTHER MOLD AND SEPARATED FROM THE FIRST LAYER BY A DEMOLDING AGENT, COMPLETELY EMBEDDING SAID PATTERN IN COMPLEMENTARY SPACED RELATION IN ONE OF SAID LAYERS OF SINTERING POWDER SO THAT BOTH
Claim 2
Independent Claim
193 words
A METHOD FOR PRODUCING A DIE OR MOLD FROM SINTERED POWDER MATERIAL AND HAVING AT LEAST ONE INTERNAL CHANNEL FORMED THEREIN FOR CONDUCTING A HEAT TRANSFER MEDIUM INTO, THROUGH, AND OUT OF THE MOLD, COMPRISING PLACING A FIRST LAYER OF SINTERING POWDER SELECTED FROM THE GROUP CONSISTING OF IRON, IRON-CARBON, COPPER, COPPER ALLOY, TUNGSTEN CARBINDE AND TITANIUM CARBIDE IN A FRAME, FORMING A MOTHER MOLD CONFORMING IN SIZE AND CONFIGURATION TO A DESIRED MOLD CAVITY, FORMING A PATTERN OF LONG AND SLENDER SHAPE HAVING A DESIRED SURFACE CONFIGURATION CORRESPONDING TO THAT OF SAID INTERNAL CHANNEL FOR CONDUCTING A HEAT TRANSFER MEDIUM AND WHICH COMPLEMENTS THE SURFACE OF THE DESIRED MOLD CAVITY, SAID PATERN BEING MADE OF METAL INFILTRATABLE INTO THE PORES OF SAID SINTERING POWDER AND HAVING A LOWER MELTING POINT THAN THAT OF SAID SINTERING POWDER, AT LEAST PARTIALLY EMBEDDING SAID MOTHER MOLD IN SAID LAYER OF SINTERING POWDER, ADDING A SECOND LAYER OF SAID SINTERING POWDER TO COMPLETELY EMBED THE MOTHER MOLD AND SEPARATED FROM THE FIRST LAYER BY A DEMOLDING AGENT, COMPLETELY EMBEDDING SAID PATTERN IN COMPLEMENTARY SPACED RELATION IN ONE OF SAID LAYERS OF SINTERING POWDER SO THAT BOTH
Claim 3
Dependent Claim
36 words
A method for producing a die or mold from sintered powder material in accordance with claim 1, wherein said mother mold is formed of a ceramic and is coated with a demolding agent prior to embedment.
Claim 4
Dependent Claim
46 words
A method for producing a die or mold from sintered powder material in accordance with claim 1, wherein said mother mold is formed of a metal infiltratable into the pores of said sintering powder and having a lower melting point than that of said sintering powder.
Claim 5
Dependent Claim
51 words
A METHOD FOR PORDUCING A DIE OR MOLD FROM SINTERED POWDER MATERIAL ACCORDING TO CLAIM 1, WHEREIN SAID PATTERN IS EMBEDED IN SAID FIRST LAYER OF SINTERING POWDER AND A SECOND AND SIMILAR PATTERN IS EMBEDED IN SAID SECOND LAYER OF SINTERING POWER PRIOR TO SAID HEATING STEP TO SINTERING TEMPERATURE.
Claim 6
Dependent Claim
33 words
A method of producing a metal die or mold from sintered powder material according to claim 1, which further comprises removing said hardened and sintered die or mold from said frame after cooling.
Claim 7
Dependent Claim
45 words
A method for producing a die or mold from sintered powder material according to claim 1, wherein said sintering powder is presintered at a lower temperature than the melting temperature of the infiltratable metal forming said pattern before heating to sinter said sintering powder completely.
Claim 8
Dependent Claim
28 words
A method for producing a die or mold from sintered powder material according to claim 1, wherein said sintering powder is compressed before heating to sinter said powder.
Claim 9
Dependent Claim
41 words
A method for producing a die or mold from sintered powder material according to claim 7, wherein said compressed sintering powder together with said mother mold and pattern embedded therein are removed from said frame before heating to sinter said powder.
Claim 10
Dependent Claim
51 words
A method for producing a die or mold from sintered powder material according to claim 1, wherein said sintering powder is ferrous metal powder whose main ingredient is iron or iron-carbon and said pattern is made of a metal selected from the group consisting of copper, copper-manganese alloy, and copper-cobalt alloy.
Claim 11
Dependent Claim
51 words
A method for producing a die or mold from sintered powder material according to claim 1, wherein said sintering powder is copper powder whose main ingredient is copper or copper alloy, and said pattern is made of a metal selected from the group consisting of lead, lead-tin alloy, and lead-cadmium alloy.
Claim 12
Dependent Claim
48 words
A method for producing a die or mold from sintered powder material according to claim 1, wherein said sintering powder is carbide powder whose main ingredient is tungsten carbide and said pattern is made of a metal selected from the group consisting of cobalt, nickel, and iron alloy.
Claim 13
Dependent Claim
49 words
A method for producing a die or mold from sintered powder material according to claim 1, wherein said sintering powder is carbide powder whose main ingredient is titanium carbide and said pattern is made of a metal selected from the group consisting of nickel, nickel-molybdenum alloy, and cobalt alloy.
References Cited (Backward Citations)
US3706550A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |