US3768344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of extrusion tools
Assignee: Individual
•
Filing: 1971-11-08
•
Granted: 1973-10-30
•
Expires: 1991-11-08
Abstract
Abstract A method of manufacturing extrusion dies or ''''tools'''' produces a tool with an accurately and well-finished tool opening in an economic manner which allows relatively unskilled labour to be employed. In the method of spark-erosion electrode is formed by machining an electrode blank to a profile complementary to the desired tool aperture, such machining employing a cutting tool which during the machining operation traverses in the general plane of the electrode, that is at right-angles to the direction in which the electrode enters the extrusion tool blank during a subsequent spark-erosion step to produce an apertured tool blank. The side wall of the aperture is thereafter finished by forcing an abrasive compound through the tool. The abrasive compound is preferably a solid wax containing abrasive particles, and heat treatment of the tool blank may be effected before abrasion or between separate abrading steps. The method is of particular application to the manufacture of tools for extruding aluminium sections.
Inventors
- 👤 E Feldcamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:00
CPC Classifications
B; B23; B23H; B23H1/00; B23H1/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
102 words
A method of manufacturing an extrusion tool, comprising the steps of forming a spark erosion electrode by machining an electrode blank to a profile complementary to the desired tool aperture, such machining employing a cutting tool which during the machining operation traverses in the general plane of the electrode, spark eroding an extrusion tool blank with the spark erosion electrode entering the extrusion tool blank in a direction at right angles to said electrode plane to produce an apertured tool blank, and thereafter finishing the side wall of the aperture in the tool blank by forcing an abrasive compound through the aperture.
Claim 2
Independent Claim
102 words
A method of manufacturing an extrusion tool, comprising the steps of forming a spark erosion electrode by machining an electrode blank to a profile complementary to the desired tool aperture, such machining employing a cutting tool which during the machining operation traverses in the general plane of the electrode, spark eroding an extrusion tool blank with the spark erosion electrode entering the extrusion tool blank in a direction at right angles to said electrode plane to produce an apertured tool blank, and thereafter finishing the side wall of the aperture in the tool blank by forcing an abrasive compound through the aperture.
Claim 3
Independent Claim
109 words
A method of manufacturing an apertured metal component, comprising the steps of forming a spark erosion electrode by machining an electrode blank to a profile complementary to the desired component aperture, such machining employing a cutting tool which during the machining operation traverses in a direction transverse to an electrode axis at right angles to the plane of said complementary profile, spark eroding a metal component blank with the spark erosion electrode entering the blank in the direction of said electrode axis to produce an apertured component blank, and thereafter finishing the side wall of the aperture in the component blank by forcing an abrasive compound through the aperture.
Claim 4
Independent Claim
109 words
A method of manufacturing an apertured metal component, comprising the steps of forming a spark erosion electrode by machining an electrode blank to a profile complementary to the desired component aperture, such machining employing a cutting tool which during the machining operation traverses in a direction transverse to an electrode axis at right angles to the plane of said complementary profile, spark eroding a metal component blank with the spark erosion electrode entering the blank in the direction of said electrode axis to produce an apertured component blank, and thereafter finishing the side wall of the aperture in the component blank by forcing an abrasive compound through the aperture.
Claim 5
Dependent Claim
31 words
A method according to claim 1, wherein the electrode is machined in a milling machine with the full depth of the electrode machined in one pass of a side milling cutter.
Claim 6
Dependent Claim
18 words
A method according to claim 1, wherein during machining the electrode is temporarily attached to a backing plate.
Claim 7
Dependent Claim
17 words
A method according to claim 4, wherein the electrode is attached to the backing plate by solder.
Claim 8
Dependent Claim
18 words
A method according to claim 1, wherein said abrasive compound is a solid wax suspension of abrasive particles.
Claim 9
Dependent Claim
22 words
A method according to claim 6, wherein the wax base of said compound has a penetration hardness of not more than 45.
Claim 10
Dependent Claim
21 words
A method according to claim 7, wherein the penetration hardness of the wax lies in the range of 30 - 35.
Claim 11
Dependent Claim
31 words
A method according to claim 6, wherein the abrading step using a wax base abrasive is one of a plurality of such steps employing abrasive particles of progressively increasing grit sizes.
Claim 12
Dependent Claim
34 words
A method according to claim 9, wherein between said abrading steps the wall of the opening is draw polished by hand in a direction across the opening, i.e., at right-angles to the abrasion direction.
Claim 13
Dependent Claim
34 words
A method according to claim 9, wherein the initial abrading step employs silicon carbide with a grit size of 150, and the final abrading step employs a grit size of between 600 and 1000.
Claim 14
Dependent Claim
36 words
A method according to claim 9, wherein at least one abrading step is effected prior to heat treatment of the spark eroded tool blank and at least one abrading step is effected after such heat treatment.
Claim 15
Dependent Claim
33 words
A method according to claim 6, wherein the wax base abrasive compound is forced through the tool opening in a manner which simulates the normal extrusion process for which the tool is designed.
Claim 16
Dependent Claim
30 words
A method according to claim 13, wherein the extruded shape of the wax compound leaving the tool opening is examined and any necessary correction of the opening effected by hand.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |