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US3963818A
Expired / Lapsed
US
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Water soluble core for pressure die casting and process for making the same
Assignee: Mazda Motor Corp
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Filing: 1974-03-27
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Granted: 1976-06-15
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Expires: 1994-03-27
Abstract
Abstract Process for producing a water-soluble core for pressure die casting by pre-drying a granular water-soluble salt having grain size of less than about 1000 microns so that the moisture content thereof becomes less than 1%, molding under compression the granular water-soluble salt into a desired shape and volume at a pressure of between about 1.5-4 tons/cm. 2 , and if necessary, sintering the molded salt at a temperature of between about 100°-300°C. The core for pressure die casting acting as a cavity former within a casting and substantially consisting of a water-soluble salt and having a compressive strength of between about 800-1480 kg./cm. 2 , a bending strength of between about 200-370 kg./cm. 2 , and a density of between 2.05-2.12.
Inventors
- 👤 Tadami Sakoda
- 👤 Tetsuhiko Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:58
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/10; B22C9/105
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
A process for preparing a water-soluble core to act as a cavity former in a pressure die casting process which comprises the steps of: 1. preparing an inorganic water-soluble salt consisting predominantly of sodium chloride or potassium chloride and having a grain size of 40 to 100 American Foundary Standard Grain Fineness Number, said salt containing a moisture content of less than 1% in weight, 2. placing said salt from step 1 in a mold, 3. compressing said salt with a pressure between 1.8 and 4.0 tons per cm 2 , and 4. removing the completed core from the mold, thereby obtaining a core characterized by a bending strength of between 200 and 230 Kg/cm 2 for use as a cavity former in a pressure die casting process.
Claim 2
Dependent Claim
128 words
A process for preparing a water-soluble core to act as a cavity former in a pressure die casting process which comprises the steps of: 1. preparing an inorganic water-soluble salt consisting predominantly of sodium chloride or potassium chloride and having a grain size of 40 to 100 American Foundary Standard Grain Fineness Number, said salt containing a moisture content of less than 1% in weight, 2. placing said salt from step 1 in a mold, 3. compressing said salt with a pressure between 1.8 and 4.0 tons per cm 2 , and 4. removing the completed core from the mold, thereby obtaining a core characterized by a bending strength of between 200 and 230 Kg/cm 2 for use as a cavity former in a pressure die casting process.
Claim 3
Dependent Claim
104 words
A process for preparing a water-soluble core to act as a cavity former in a pressure die casting process which comprises to steps of: 1. preparing an inorganic water-soluble salt consisting predominantly of sodium chloride or potassium chloride and having a grain size of 40 to 100 American Foundary Standard Grain Fineness Number, said salt containing a moisture content of less than 1% by weight, 2. placing said salt in a mold, 3. compressing said salt with a pressure of between 1.5 and 4.0 tons per cm 2 , 4. sintering said salt for 10 to 60 minutes at 100° to 300° C., and
Claim 4
Dependent Claim
104 words
A process for preparing a water-soluble core to act as a cavity former in a pressure die casting process which comprises to steps of: 1. preparing an inorganic water-soluble salt consisting predominantly of sodium chloride or potassium chloride and having a grain size of 40 to 100 American Foundary Standard Grain Fineness Number, said salt containing a moisture content of less than 1% by weight, 2. placing said salt in a mold, 3. compressing said salt with a pressure of between 1.5 and 4.0 tons per cm 2 , 4. sintering said salt for 10 to 60 minutes at 100° to 300° C., and
Claim 5
Dependent Claim
35 words
removing the completed core from the mold, thereby obtaining a core characterized by a bending strength of between 200 and 370 Kg/cm 2 for use as a cavity former in a pressure die casting process.
Claim 6
Dependent Claim
35 words
removing the completed core from the mold, thereby obtaining a core characterized by a bending strength of between 200 and 370 Kg/cm 2 for use as a cavity former in a pressure die casting process.
References Cited (Backward Citations)
US3356129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |