Whirlwind forming method and device for internal thread

Abstract

The invention discloses a whirlwind forming method and device for an internal thread and belongs to the technical field of manufacturing equipment. The whirlwind forming device for the internal thread comprises a cutter device and a driving device, wherein the cutter device is mounted on the driving device, and the driving device is used for driving the cutter device; during working, the axis of a cutter is parallel with the axis of a workpiece, and a radial eccentric distance is set; the cutter rotates around the axis of the cutter at a high speed in a single direction and reciprocates linearly along the axis, and the movement trajectory in space is a fixed closed space curve every circle the cutter rotates; the workpiece rotates around the axis of the workpiece at a low speed in a single direction and moves linearly along the axis in a single direction, and the linear movement distance is one thread pitch every circle the workpiece rotates. The axial length of the workpiece capable of being machined is not limited, and although factors such as the axial rigidity of the cutter are considered, the axial length of the workpiece capable of being machined is still significantly longer than that of workpieces in the traditional method; the internal thread is formed in one step, and the efficiency is high; cuttings formed by cutting of the workpiece by the cutter are fragment-shaped instead of being long-strap-shaped, and discharge of the cuttings is facilitated.

Description

technical field [0001] The invention belongs to the technical field of manufacturing equipment, and relates to a method and device for forming an internal thread cyclone. Background technique [0002] First explain the situation of the workpiece. The shape of the workpiece is cylindrical, and there is a round hole inside. There is a thread groove with a fixed pitch along the cylindrical helix in the round hole. The cylindrical helix has an axis. On the section surface passing through the axis, the thread The slots can be in different shapes, such as trapezoidal, arcuate, etc. For example, in the ball nut of the transmission element ball screw pair, the cross-sectional shape of the internal thread raceway is a double arc shape. [0003] At present, there is also a thread whirl milling process for processing threads, but the usual thread whirl mill is equipped with a high-speed milling thread device on an ordinary lathe, or a special high-efficiency thread processing machine ...

AI Technical Summary

Problems solved by technology

Although the milling speed is high and the processing efficiency is fast, it is subject to various restrictions in practice.

For example, it is difficult to process internal threads, especially those with long axial length or small inner diameter and cross-sectional shape.

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