US3663785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A method of erosively shaping a master die
Assignee: Individual
•
Filing: 1970-12-14
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Granted: 1972-05-16
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Expires: 1990-12-14
Abstract
Abstract A method of shaping electrodes for use in electrical discharge machining processes comprising the steps of preparing an oversize cavity in a master die member on an apparatus that provides oscillatory rotary motion to either a die member or a model electrode member used to form the cavity of the die member, providing an abrasive surface on the cavity of master die member and utilizing in conjunction with the master die an apparatus, similar to that used to form the cavity in the master die member, to abrade and form an electrode workpiece member to an electrical discharge machining electrode of the size of the model electrode member.
Inventors
- 👤 Elmer P Hausermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:28
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/26; B23H7/28; B23H1/00; B23H1/04; B23Q; B23Q1/00; B23Q1/25; B23Q1/44; B23Q1/50; B23Q1/54; B23Q1/5468; B24; B24B; B24B35/00; B24B35/005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
253 words
A method of forming an electrode member for use in an electrical discharge machining operation comprising the steps of mounting a model electrode member, having the dimensions of the electrode to be formed, in parallel relation to a die workpiece member, operating upon said die workpiece member with said model electrode member to form a cavity in said die workpiece member and in conjunction with such operation applying oscillatory rotary motion to one of said model electrode and die workpiece members so aS to oscillate the same in its own plane to produce a master die member having a cavity which is oversize relative to said model electrode member by an amount equal to the total amplitude of said oscillatory rotary motion, providing an abrasive surface on said master die member, mounting an electrode workpiece member in alignment with said master die member and moving said members into contact with one another to force said electrode workpiece member into said master die member while conjointly applying oscillatory rotary motion to one of said members whereby through an abrasion operation said electrode workpiece member is formed into an electrode member which is undersize relative to said master die member by an amount equal to total amplitude of said lastmentioned oscillatory rotary motion, and controlling the latter amplitude so as to be equal to the amplitude of said firstmentioned oscillatory rotary motion whereby the dimensions of the electrode member produced by said abrasion operation will be equal to the dimensions of said model electrode member.
Claim 2
Independent Claim
253 words
A method of forming an electrode member for use in an electrical discharge machining operation comprising the steps of mounting a model electrode member, having the dimensions of the electrode to be formed, in parallel relation to a die workpiece member, operating upon said die workpiece member with said model electrode member to form a cavity in said die workpiece member and in conjunction with such operation applying oscillatory rotary motion to one of said model electrode and die workpiece members so aS to oscillate the same in its own plane to produce a master die member having a cavity which is oversize relative to said model electrode member by an amount equal to the total amplitude of said oscillatory rotary motion, providing an abrasive surface on said master die member, mounting an electrode workpiece member in alignment with said master die member and moving said members into contact with one another to force said electrode workpiece member into said master die member while conjointly applying oscillatory rotary motion to one of said members whereby through an abrasion operation said electrode workpiece member is formed into an electrode member which is undersize relative to said master die member by an amount equal to total amplitude of said lastmentioned oscillatory rotary motion, and controlling the latter amplitude so as to be equal to the amplitude of said firstmentioned oscillatory rotary motion whereby the dimensions of the electrode member produced by said abrasion operation will be equal to the dimensions of said model electrode member.
Claim 3
Dependent Claim
33 words
A method in accordance with claim 1 where the operation on said die workpiece member by said model electrode member to form a cavity in the latter comprises an electrical discharge machining operation.
Claim 4
Dependent Claim
128 words
A method in accordance with claim 2 where the step of applying oscillatory rotary motion to one of said model electrode and die workpiece members is carried out by intermittently discontinuing said electrical discharge machining operation by withdrawing said model electrode from the cavity of said die workpiece members, moving one of said members through a segmental portion comprised of from 1* to 180*, that is from one-three hundred sixtieth to one-half of one complete rotary oscillatory movement, placing said model electrode in the die cavity again for a continuation of said electrical discharge machining operation, and repeating the withdrawal and segmental movement of said one member and subsequent electrical discharge machining steps until said one member has been moved through at least one complete oscillatory rotary movement.
Claim 5
Dependent Claim
35 words
A method in accordance with claim 2 where the step of applying oscillatory rotary motion to one of said model electrode and die workpiece members is carried out simultaneously with said electrical discharge machining operation.
Claim 6
Dependent Claim
29 words
A method in accordance with claim 2 where said abrasive surface is formed on said master die member by means of spark discharge during said electrical discharge machining operation.
Claim 7
Dependent Claim
179 words
A method in accordance with claim 1 where the step of operating upon said die workpiece member with said model electrode member to form a cavity in said die workpiece member comprises filling a container with molding sand or the like to provide a sand container member to serve as said die workpiece member, forcing said model electrode member into said sand container member to form a cavity in the sand and in conjunction with such operation applying oscillatory rotary motion to one of said model electrode and sand container members so as to oscillate the same in its own plane to provide a cavity which is oversize relative to said model electrode member by an amount equal to the total amplitude of said oscillatory rotary motion, filling said cavity with plaster and allowing the same to harden to cast an oversize model electrode member, placing said oversize model electrode member in a thermoset-abrasive composition to form a cavity therein, and curing said thermoset-abrasive composition and removing said oversize model electrode member therefrom to form said master die member.
Claim 8
Dependent Claim
119 words
A method in accordance with claim 6 where the step of applying oscillatory rotary motion to one of said model electrode and sand container members is carried out by intermittently removing said model electrode member from said sand container member, moving one of said members through a segmental portion comprised of from 1* to 180*, that is from one-three hUndred sixtieth to one-half of one complete rotary oscillatory movement, again forcing said model electrode member into said sand container member, and repeating the separation and segmental movement of said one member and further insertion of said model electrode member into said sand container member until said one member has been moved through at least one complete oscillatory rotary movement.
Claim 9
Dependent Claim
147 words
A method in accordance with claim 1 wherein the operation on said die workpiece member by said model electrode member to form a cavity in the latter comprises the step of filling a container with a plastic composition containing an abrasive and curing agent, to serve as the die workpiece member, forcing said model electrode member into said plastic container member to form a cavity in said plastic and in conjunction with such operation applying oscillatory rotary motion to one of said model electrode and plastic container members so as to oscillate the same in its own plane to provide a cavity in the plastic which is oversize relative to said model electrode member by an amount equal to the total amplitude of said oscillatory rotary motion while simultaneously curing said plastic composition and removing said oversize model electrode member therefrom to form said master die member.
Claim 10
Dependent Claim
18 words
The method of claim 8 where heat is applied to said plastic to aid in curing the plastic.
Claim 11
Dependent Claim
117 words
The method of claim 8 where the step of applying oscillatory rotary motion to one of said model electrode and plastic container members is carried out by intermittently removing said model electrode member from said plastic container member, moving one of said members through a segmental portion comprised of from 1* to 180*, that is from one-three hundred sixtieth to one-half of one complete rotary oscillatory movement, again forcing said model electrode member into said plastic container member, and repeating the separation and segmental movement of said one member and further insertion of said model electrode member into said plastic container member until said one member has been moved through at least one complete oscillatory rotary movement.
References Cited (Backward Citations)
US2924701A
Cited
US3497930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |