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Spark Erosive Shaping of Surfaces of Electrically Conductive Workpieces

IP.com Disclosure Number: IPCOM000052547D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Olbert, M: AUTHOR

Abstract

Workpieces often require accurately shaped surfaces. Magnetic heads, for example, have sliding faces with particular profiles which are difficult to produce because of their shape, accuracy and hardness. A profile may have an H-shape, as shown in Fig. 1.

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Spark Erosive Shaping of Surfaces of Electrically Conductive Workpieces

Workpieces often require accurately shaped surfaces. Magnetic heads, for example, have sliding faces with particular profiles which are difficult to produce because of their shape, accuracy and hardness. A profile may have an H-shape, as shown in Fig. 1.

For this purpose, workpiece 1 is photoresist coated in the desired H-shape, for example, by screen printing. Regions 2 are masked with photoresist. Using a dielectric 4 and an electrode 5, the bare regions 3 are removed by spark erosion occurring between powered electrode 5 and powered workpiece 1. The amount of material removed is controllable. As shown in Fig. 3, a raised surface profile 6 is obtained by spark eroding regions 3'.

The maximum depth down to which material is removed may exceed 0.5 mm and depends on the conductance of dielectric 4 and the spark voltage. The conductance of dielectric 4 is chosen to suit the breakdown strength of the photoresist used to mask regions 2, 6. Electrode 5 is moved during the erosion process which proceeds at high rates.

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