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Large-piece processing clamping method

A large workpiece, turning technology, applied in the field of turning and clamping of super long workpieces, can solve the problem of particularly high strength requirements of double centers, achieve large expansion force, good coaxiality, ensure coaxiality and related The effect of precision

Active Publication Date: 2009-02-11
JIANGSU SHUGUANG OIL DRILLING EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it is not good for super long workpieces, the strength requirements of double centers are particularly high, and when live centers are used, there are certain problems in the entry and exit of the tool during turning.

Method used

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  • Large-piece processing clamping method

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Experimental program
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Effect test

Embodiment Construction

[0009] Embodiments of the present invention are described as follows in conjunction with the accompanying drawings:

[0010] Connect one end of the clamp body 3 of a pair of expanding core fixtures to the two-way automatic hydraulic chuck respectively, and the other end extends into the processed inner hole of the workpiece 5 (petroleum drill pipe joint), start the two-way automatic hydraulic chuck, and pass the chuck The hydraulic piston in the disc drives the push rod 4 in the fixture to extend forward, relying on the front end of the push rod 7 0 ~9 0 The inclined conical surface pushes the radial slider 2 to move radially outward at the same time, and the two ends of the inner hole of the workpiece are tightened, and then the turning process can be carried out. There are three uniformly distributed and identical radial sliders 2 in each end of the expanding core fixture. Two rubber rings 1 are arranged in the arc-shaped grooves on the outer circle of the same group of rad...

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Abstract

The invention discloses a clamping method for the processing of a supper-long large work piece vehicle. Both ends of a work piece are supported by utilizing a double way automatic hydraulic pressure chuck and a pair of expansion core fixtures, the movement of the push rod inside of the expansion core fixtures is driven by a hydraulic piston inside the chuck, a group of radial slide blocks inside the expansion fixture are pushed and inner bores on both ends of the work piece are expanded, a rubber ring for resetting is installed on the slide block, and the contact part between the push rod and the axial slide block is a cone surface. As the coaxiality of the double way automatic hydraulic pressure chuck is good, the strength of the expansion fixture is high, the distensible force is large, the clamping requirement on the processing of the supper-long large work piece vehicle can be met, the turnaround of the vehicle is not required during the processing, the problem of free swinging knife does not exist, the coaxiality precision and the relevant processing precision of the work piece can be ensured, the operation is convenient, the production efficiency is high, and the clamping method can be suitable for clamping work pieces with different bore diameters by replacing the slide block.

Description

technical field [0001] The invention relates to a clamping method for turning, in particular to a clamping method for super long workpieces. Background technique [0002] Under normal circumstances, the turning processing of super long workpieces adopts the clamping method of one clamp, one top and a steady rest. One clamp, one top plus center frame refers to: use the spindle chuck to clamp one end of the workpiece, use the live center of the tailstock to withstand the other end of the workpiece, and then use the center frame to support the middle part of the workpiece. This clamping method is aimed at The coaxiality of the inner and outer circles is not high, and workpieces with uncomplicated surface shapes are acceptable, but it is difficult to meet the processing requirements for super long workpieces such as oil drill pipe joints. With the clamping method of one clamp, one top and then the center frame, the workpiece must be turned around for processing, and there are i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23Q3/12
Inventor 张希平周开华
Owner JIANGSU SHUGUANG OIL DRILLING EQUIP CO LTD
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