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Investment Cast Linear Motor

IP.com Disclosure Number: IPCOM000046359D
Original Publication Date: 1983-Jul-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Majewski, FT: AUTHOR

Abstract

Prior motor bodies are fabricated of tool steel. Each one contains four precisely located cylinder bores. In order to transmit the oil between the cylinder bores, a number of cross-lined oil passages are a part of the interior configuration. The motor body is totally machined from a solid block of tool steel, heat treated, stress relieved and plated. The oil passage holes are precisely drilled through the entire block, and then the ends are sealed with plugs. Since a piston with side loads is used in each cylinder bore, it has been necessary to include linear bearings in each cylinder bore. The result is a very costly motor body, heavy in weight and requiring critical quality control.

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Investment Cast Linear Motor

Prior motor bodies are fabricated of tool steel. Each one contains four precisely located cylinder bores. In order to transmit the oil between the cylinder bores, a number of cross-lined oil passages are a part of the interior configuration. The motor body is totally machined from a solid block of tool steel, heat treated, stress relieved and plated. The oil passage holes are precisely drilled through the entire block, and then the ends are sealed with plugs. Since a piston with side loads is used in each cylinder bore, it has been necessary to include linear bearings in each cylinder bore. The result is a very costly motor body, heavy in weight and requiring critical quality control.

An investment cast motor body has been developed that offers a number of advantages. It eliminates the need for costly precision machining, insures uniformity, and eliminates the need for a costly linear bearing. The motor body is investment cast using aluminum (see the figures). All internal parts are precast, eliminating the need for end plugs. The cylinder bores l0 are likewise precast. The precast cylinder holes l0 are machined to a specified diameter and then roller burnished to the final diameter. This provides a smooth cylinder bore, and by compacting the materials results in a work hardened surface.

The finished part is synergistic coated with TEFLON* and tungsten, which produces a harder than steel surface on aluminum, becomes an integral part o...