Turning processing clamp used for outer threaded joint of water-resisting guide tube

A technology of external threaded joints and risers, applied in the direction of chucks, etc., can solve the problems of inappropriate three-jaw self-centering chucks, reducing turning efficiency and safety, unstable workpiece machining positions, etc., to improve turning efficiency. and turning quality, enhanced rigidity, easy to make effects

Inactive Publication Date: 2019-04-16
JIANGSU SHUGUANG OIL DRILLING EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thread to be processed of the male joint of the water-resistance conduit is on the outer layer, and only the internal expansion method can be used for clamping. The existing technology uses a three-jaw self-centering chuck for expansion. Although this method is simple, reliable, and convenient Machining, however, the workpiece unloaded after turning is deformed
The method of appropriately reducing the internal expansion force can reduce the amount of deformation after machining, but the new problem is that the machining position of the workpiece is unstable, which will inevitably reduce the turning efficiency and safety.
In general, turning the external thread of the male joint of the riser still makes the three-jaw self-centering chuck unsuitable, and necessary structural improvements are required

Method used

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  • Turning processing clamp used for outer threaded joint of water-resisting guide tube
  • Turning processing clamp used for outer threaded joint of water-resisting guide tube
  • Turning processing clamp used for outer threaded joint of water-resisting guide tube

Examples

Experimental program
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Effect test

Embodiment 1

[0019] figure 1 and figure 2 Shown is a turning fixture for external threaded joints of water risers, which consists of a three-jaw self-centering chuck 1, inner jaws 2 and bolts 3. The outer end surface of the claws 1.1 matched with the three-jaw self-centering chuck 1 is a plane, and the three uniformly distributed claws 1.1 are on the same plane, and the plane is perpendicular to the axis. The inner jaw 2 is a special-shaped part, which is composed of a rectangular bottom plate 2.1 and a section of arc-shaped boss 2.2 facing inward. The arc boss 2.2 configured by the inner jaw 2 is directly against the inner wall of the workpiece 4. In order to further improve the rigidity of the workpiece 4 at the installation position, the radius R of the outer circle of the arc boss 2.2 configured by the inner jaw 2 is equal to the inner hole of the workpiece 4 to be processed. Half of the diameter, the workpiece 4 of this embodiment is an 18-inch water-resistance conduit, and its inn...

Embodiment 2

[0021] figure 1 and figure 2 Shown is a turning fixture for external threaded joints of water risers, which consists of a three-jaw self-centering chuck 1, inner jaws 2 and bolts 3. The outer end surface of the claws 1.1 matched with the three-jaw self-centering chuck 1 is a plane, and the three uniformly distributed claws 1.1 are on the same plane, and the plane is perpendicular to the axis. The inner jaw 2 is a special-shaped part, which is composed of a rectangular bottom plate 2.1 and a section of arc-shaped boss 2.2 facing the same direction. The arc boss 2.2 configured by the inner jaw 2 is directly against the inner wall of the workpiece 4. In order to improve the installation rigidity of the workpiece 4, the radius R of the outer circle of the arc boss 2.2 configured by the inner jaw 2 is equal to half the diameter of the inner hole of the workpiece 4 to be processed. Example Workpiece 4 is a 40-inch water-resistance conduit with an inner hole diameter of 1016mm, so...

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Abstract

The invention discloses a turning processing clamp used for an outer threaded joint of a water-resisting guide tube. The turning processing clamp consists of a three-claw self-centring chuck, inner claws and bolts, wherein the outer end surfaces of clamping claws of the three-claw self-centring chuck are planes, and the three clamping claws which are uniformly distributed are on the same plane, and the plane is perpendicular to the axis; each inner claw is a specially shaped part, and is formed by superposing a rectangular bottom plate and a circular-arc-shaped lug boss which is bent inwards;two through holes are formed in the bottom plate of the top of each circular-arc-shaped lug boss; and the inner claw of each clamping claw is used for positioning and connecting through the bolt, so that a self-centring circular inner expansion structure in which the inner claw rotates along with the clamping claw is formed. The structure is uniform in stress distribution while internally expanded, greatly reduces workpiece deformation, remarkably strengthens rigidity during workpiece clamping, and facilitates increasing turning amount, so that turning efficiency and turning quality are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of mechanical cutting fixtures. Specifically, the invention relates to a positioning turning fixture, especially a turning fixture for external thread joints of water-resisting conduits. Background technique [0002] The deep-sea drilling project needs to be equipped with a water riser. The two ends of the joint-connected water riser are respectively provided with an externally threaded male joint and an internally threaded female joint. The upper and lower joints are connected by pairing the male and female joints. Both the male joint and the female joint of the water riser are large-diameter thin-walled pipe fittings, and the configured threads are all formed by turning. People in the industry know that the difficulties in turning large-diameter thin-walled pipe fittings are thermal deformation and stress deformation. The thread to be processed of the male joint of the water-resistance conduit is on the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B31/103B23B31/16
CPCB23B31/103B23B31/16
Inventor 袁志强徐顺曹华
Owner JIANGSU SHUGUANG OIL DRILLING EQUIP CO LTD
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