Long-stroke pneumatic hydraulic cylinder body and its processing method

Abstract

The invention discloses a long-stroke pneumatic hydraulic cylinder body which includes an outer cylinder body and an inner cylinder body which are made of circular steel pipes; the middle part of the outer cylinder body has an oil through which is communicated with the hydraulic cavity of the pneumatic cylinder body; the pneumatic hydraulic cylinder body is characterized in that the inner wall surfaces of the outer cylinder body and the inner cylinder body are respectively provided with grids which can store oil and lead the outer cylinder body and the inner cylinder body to keep long-time lubrication, reduce wear and prolong service life although the grids are tiny. The processing method of the outer cylinder body is as follows: a. fetching a seamless precision steel pipe with the specification of inner hole diameter of 15<-0.07><-0.10>mm, and length of 400 mm; b. using a lathe for turning both ends flat, and heat treatment quenching and tempering stereotype; c. using honing roughing, grinding the inner hole diameter up to be 15<-0.02><-0.03>mm; d. using a mandrel for sheathing the inner hole, using an excircle grinder for grinding the excircle, requesting concentricity; e. using a CNC lathe for cutting the oil through; f. carbonation treatment: enabling the depth up to be more than 0.05 mm; and g. adopting honing finishing so as to lead the finish to be about 0.05 mm and the straightness to be 400 / 0.01 mm, and the roundness to be controlled as 0.002 mm, and lead the inner wall surface of the steel pipe to form small grids.

Description

technical field [0001] The invention relates to a pneumatic hydraulic cylinder, in particular to a cylinder body of the pneumatic hydraulic cylinder, a processing method for the cylinder body and equipment used for processing, and belongs to the field of mechanical manufacturing. Background technique [0002] When automatic drilling with drilling machine or lathe, milling machine, etc., it is necessary to advance slowly and stably at a feed speed. In order to achieve the above purpose, a governor (or damper) is usually installed on the relevant processing mechanism or equipment, and the governor is used as the control. components to ensure the feed rate. The governor generally adopts the linkage structure of the cylinder and the hydraulic cylinder, and uses the air pressure to adjust the pressure of the hydraulic cylinder to adjust the movement speed of the hydraulic cylinder piston. For example, the specific structure of the governor disclosed in Chinese patent ZL 200620107...

AI Technical Summary

Problems solved by technology

However, the inner hole of the hydraulic cylinder of the governor (or damper) is relatively small, generally 15 mm in diameter, and the effective stroke N processed by conventional methods is only about 100 mm, which is difficult to reach more than 150 mm. Restricted; and the governor is in a frequent working state, because the inner wall surface of the inner and outer cylinders is flat and the oil storage capacity is poor, resulting in large friction in the cylinder, which makes the piston, sealing ring, etc. easy to wear and short service life

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