Lathe and method for processing external thread of screw

Abstract

The invention discloses a lathe for processing an external thread of a screw which can avoid that the screw is bent when being processed. The lathe for processing the external thread of the screw provided by the invention comprises a lathe base, a chuck and a tail bed which are arranged on the lathe base as well as an external thread cutting die, wherein the external thread cutting die is clamped onto the chunk and is coaxial with a workpiece, the clamping part of the tail bed is provided with a standstill locking structure, and the workpiece is arranged on the tail bed and can axially move relative to a shaft of the lathe base. The external thread cutting die is used for processing the screw, thus the workpiece only receives torque and no radial force during processing, no bending moment capable of causing the screw to be bent is produced, cutter relieving phenomenon on the workpiece can not be produced, and external thread accuracy of a finished product screw is guaranteed.

Description

technical field [0001] The invention relates to a lathe, in particular to a lathe for machining external threads of a screw rod. In addition, the present invention also relates to a processing method, especially a method for processing the external thread of a screw rod. Background technique [0002] Usually, the external thread of a slender threaded rod is processed by a common lathe, such as figure 1 The method shown: Fix the rod to be processed between the chuck and the top, and complete the processing of the external thread of the screw through the rotation of the workpiece and the action of the thread milling cutter. [0003] There is a problem with this processing method: the longer the length of the screw, the larger the aspect ratio, the worse the clamping rigidity, and it is easy to bend under the action of the cutting force F. At the same time, due to the long length of the rod, the thermal The deformation elongation is large, and the ordinary rear tip fixation w...

AI Technical Summary

Problems solved by technology

[0003] There is a problem with this processing method: the longer the length of the screw, the larger the aspect ratio, the worse the clamping rigidity, and it is easy to bend under the action of the cutting force F. At the same time, due to the long length of the rod, the thermal The deformation elongation is large, and the ordinary rear tip fixation will hinder its elongation, which will aggravate the bending of the screw to be processed

However, the bending of the workpiece during processing will cause the tool to give way, which will affect the processing quality and eventually lead to the formation of a large number of processing waste products.

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