US3779304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection gate system
Assignee: Nippon Light Metal Co Ltd
•
Filing: 1971-07-13
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Granted: 1973-12-18
•
Expires: 1991-07-13
Abstract
Abstract In an oxygen flush presure injection die casting system, the molten metal is introduced into the die cavity in a turbulent condition to achieve efficient mixing with the oxygen gas in such cavity and thus promote reaction of the metal with the gas and minimize the presence of blow holes in the cast product.
Inventors
- 👤 I Miki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:11
CPC Classifications
B; B22; B22D; B22D17/00; B22D17/08; B22D17/10; B22D17/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
148 words
A die casting apparatus comprising a set of cooperating dies defining therebetween a die cavity, a gate opening into said die cavity and a runner connected to said gate, an injection sleeve connected to said runner, a plunger reciprocating in said sleeve for injecting molten metal from said sleeve into said die cavity through said gate and runner, and means for feeding oxygen gas into said sleeve and cavity to displace air therefrom prior to injection of molten metal, and means in said gate for imparting a turbulent condition to the metal injected therethrough to achieve efficient mixing and thus efficient chemical reaction between the metal and oxygen gas to minimize the presence of blow holes containing unreacted oxygen gas, said latter means comprising a constriction adjacent the inlet opening of the gate and from which the downstream walls of the gate expand outwardly in a concave configuration.
Claim 2
Dependent Claim
148 words
A die casting apparatus comprising a set of cooperating dies defining therebetween a die cavity, a gate opening into said die cavity and a runner connected to said gate, an injection sleeve connected to said runner, a plunger reciprocating in said sleeve for injecting molten metal from said sleeve into said die cavity through said gate and runner, and means for feeding oxygen gas into said sleeve and cavity to displace air therefrom prior to injection of molten metal, and means in said gate for imparting a turbulent condition to the metal injected therethrough to achieve efficient mixing and thus efficient chemical reaction between the metal and oxygen gas to minimize the presence of blow holes containing unreacted oxygen gas, said latter means comprising a constriction adjacent the inlet opening of the gate and from which the downstream walls of the gate expand outwardly in a concave configuration.
Claim 3
Dependent Claim
12 words
The die casting apparatus of claim 1 wherein said constriction is sharp-edged.
Claim 4
Dependent Claim
20 words
The die casting apparatus of claim 1 wherein the overall angle of expansion of the downstream gate wall is 5*-18*.
Claim 5
Dependent Claim
15 words
The die casting apparatus of claim 3 wherein the overall angle of expansion is 7-14*.
Claim 6
Dependent Claim
30 words
The die casting apparatus of claim 1 wherein said gate and runner are each formed in bell shape and interconnect at their lesser diameter ends to define a constriction therebetween.
References Cited (Backward Citations)
CA729086A
Cited
US1971652A
Cited
US2582260A
Cited
US3349833A
Cited
US3382910A
Cited
US3672440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |