thread-changing joint

But loose problem is still the most difficult one of thread joint.

但其松动问题一直是螺纹紧固件的最大难题。

Nowadays, the commonly used method of tightening screw thread is torque control method, which causes decentralization of axial pre-tightening force, and decreases the reliability of the joint.

目前最常用的螺纹拧紧方法是扭矩控制法，该方法容易导致螺纹副轴向预紧力分散，联接可靠性不高。

This paper discusses the mechanical, hardware, software configurations and principles of CAT system for joint internal thread in details.

详细介绍了油管接箍内螺纹计算机辅助测量系统的机械、软硬件结构与原理。

But oil well pipe joint is one typical thin-wall barrel workpiece which causes the difficulty of inside taper thread processing.

但油井管接头是典型的薄壁筒状工件，它的内锥螺纹加工有较大的难度。

The CAT System Software Design for Internal Thread of Joint

油套管接头螺纹CAT系统软件的设计与开发