US3694610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing a metal mold by electrical machining
Assignee: Mitsubishi Electric Corp
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Filing: 1971-12-06
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Granted: 1972-09-26
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Expires: 1991-12-06
Abstract
Abstract A metal mold is prepared by an electrical machining process wherein one of a base metal mold and an upper metal mold is electrically shaped by using an electrode having a desired shape on a surface thereof facing the workpiece, and the electrode then is fitted into the shaped metal mold to make a composite electrode of the two, and if necessary, the opposite surface of the electrode is also shaped. The other metal mold is then electrically shaped by using the composite electrode having the desired shape. With this invention, it is possible to provide a metal mold for thin articles, such as plastic articles.
Inventors
- 👤 Nagao Saito
- 👤 Kazushige Koike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:44
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/06; B22C9/061
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
83 words
A process for preparing a metal mold which comprises the steps of: electrically machining one of a first metal mold half and a second metal mold half using an electrode having a preselected shape; and further electrically machining the other of said first and second metal mold halves using an electrode compositely formed of said one of said first and second metal mold halves and said electrode of preselected shape being fitted within said one of said first and second metal mold halves.
Claim 2
Dependent Claim
83 words
A process for preparing a metal mold which comprises the steps of: electrically machining one of a first metal mold half and a second metal mold half using an electrode having a preselected shape; and further electrically machining the other of said first and second metal mold halves using an electrode compositely formed of said one of said first and second metal mold halves and said electrode of preselected shape being fitted within said one of said first and second metal mold halves.
Claim 3
Dependent Claim
40 words
A process for preparing a metal mold according to claim 1, which further comprises: first electrically machining one of said first and second metal mold halves using the other of said first and second metal mold halves as an electrode.
Claim 4
Dependent Claim
27 words
A process for preparing a metal mold according to claim 2, wherein said electrode is fixed to a holder with an alloy having a low melting point.
Claim 5
Dependent Claim
82 words
A process for preparing a metal mold according to claim 1, in which said electrode has a preselected shape on at least one surface thereof; and further comprising: electrically machining the opposite surface of said electrode while being fitted within said one of said first and second metal mold halves and before electrically machining said other of said first and second metal mold halves with said composite electrode; and separating said electrode from said one of said first and second mold halves.
Claim 6
Dependent Claim
27 words
A process for preparing a metal mold according to claim 4, wherein said electrode is fixed to a holder with an alloy having a low melting point.
Claim 7
Dependent Claim
35 words
A process for preparing a metal mold according to claim 4, wherein said electrode is fixed to said one of said first and second metal mold halves with an acrylic type binder for immediate bonding.
Claim 8
Dependent Claim
27 words
A process for preparing a metal mold according to claim 1, wherein said electrode is fixed to a holder with an alloy having a low melting point.
Claim 9
Dependent Claim
35 words
A process for preparing a metal mold according to claim 1, wherein said electrode is fixed to said one of said first and second metal mold halves with an acrylic type binder for immediate bonding.
References Cited (Backward Citations)
US2924701A
Cited
US2927190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |