Precision static pressure linear guide rail

Abstract

The invention discloses a precision static pressure linear guide rail, which is provided with a bed piece and a sliding base for placing workpieces, wherein the bottom surface of the sliding base is fixedly provided with a sliding block, and a groove with a downward opening is formed in the sliding block; the position, which corresponds to the groove of the sliding block, on the bed piece is fixedly provided with a guide rail which can be embedded into the groove of the sliding block; and the inner peripheral wall of the groove of the sliding block is provided with a plurality of lubrication grooves which are combined with the guide rail to form a lubrication chamber, the inside of each of the lubrication grooves is provided with a sealing element, and the lubrication grooves are communicated with an oil supply mechanism through oil channels. Each oil channel for supplying oil for the lubrication grooves is provided with a check valve. The sealing element arranged in the lubrication groove comprises a guide rail plate, a metal frame and an O-shaped sealing ring, the guide rail plate is arranged on one side, which is close to a base surface of the guide rail, in the lubrication groove, the metal frame is arranged between the guide rail plate and the groove bottom of the lubrication groove, and the O-shaped sealing ring is embedded into a sealing groove formed on the metal frame. The precision static pressure linear guide rail only needs an oil source with small capacity to intermittently work, and radically eliminates heating phenomenon.

Description

technical field [0001] The invention belongs to a static pressure linear guide rail, in particular to a precision static pressure linear guide rail which can be produced on an industrial scale and become a general functional part of a machine tool. Background technique [0002] Linear static pressure guide rails are often used on large heavy-duty machine tools. When using static pressure guide rails, the moving part of the machine tool is lifted by oil pressure, and a 0.02-0.05mm thick oil film is formed between the moving part of the guide rail and the static pressure part. One thickness is greater than the linear error of the guide rail, so when the guide rail moves in a straight line, the direct contact of metal to metal is eliminated, and it is in pure liquid friction, and the friction coefficient of liquid is only 0.0005, which is only 1 / 1000 of the friction coefficient of metal to metal Therefore, the use of hydrostatic guide rails greatly reduces the driving force and...

AI Technical Summary

Problems solved by technology

[0003] 1. A reliable oil source for continuous operation is required, which consumes power and is expensive to use

[0004] 2. The hydraulic oil of the hydrostatic guide rail oil supply system generates heat during the pressure cycle, which often affects the accuracy of the machine tool, so a cooler is required

[0005] 3. The oil circuit system of the traditional static pressure guide rail is partly open, so it is easy to leak and pollute the environment, and the oil is often polluted to cause wear of the guide rail

[0006] 4. So far, the static pressure guide rail is still in the design and manufacture of whoever uses it, and has not formed an industrial scale production like bearings and fasteners, so the quality is uneven

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