A Prestressed Grinding Method for Revolving Workpieces

Abstract

The invention discloses a prestress grinding method for a revolved body workpiece. The method includes the following steps that (1) the workpiece to be machined is well clamped on a grinding machine; (2) tool setting operation is conducted, a grinding wheel and the workpiece are made to be in a low speed state first, the position of the grinding wheel is adjusted step by step, the linear speed of the grinding wheel is adjusted to be in an ultra high speed state of vs>=150 m / s after sparks just appear on the surface of the workpiece, and the rotating speed of the workpiece is adjusted to be in an ultra high speed centrifugal state; (3) abrasive machining is carried out according to a certain radial amount of feed; after machining is completed, the grinding wheel and the workpiece are separated first, and then the grinding wheel and the workpiece are decelerated to be zero. According to the prestress grinding method for the revolved body workpiece, there is no need to use a special force application mechanism to apply prestress to the workpiece, only the rotating speed of the workpiece in the machining process needs to be controlled, and residual compressive stress can be obtained on the surface of the workpiece after machining is completed; due to the fact that the rotating speed of the workpiece can be adjusted flexibly, different magnitudes of residual compressive stress can be obtained by controlling the rotating speed of the workpiece, so that the using requirements of different parts are met.

Description

Technical field [0001] The invention relates to a mechanical processing method, in particular to a prestress grinding method. Background technique [0002] Grinding is a commonly used machining method for finishing the workpiece, including surface grinding and cylindrical grinding. In the grinding process, greatly increasing the linear speed of the grinding wheel can improve the processing efficiency and enable the workpiece to obtain higher processing accuracy. For example, the German grinding expert Carl.J.Salomom proposed "ultra-high-speed grinding" based on the "hot groove" theory. The linear speed of the grinding wheel is greater than 150m / s, which can realize high-efficiency precision machining of the workpiece. In the theory of "ultra-high speed grinding", there is no special requirement for the rotation speed of the workpiece, and the rotation speed of the workpiece is usually required. w ≥500r / min. In order to further improve the processing efficiency, the theory of "e...

AI Technical Summary

Problems solved by technology

[0004] 1. It is necessary to use a special force device to apply force to the workpiece, which makes the structure of the workpiece fixture more complicated and the operation more troublesome; and for the occasions where the workpiece needs to be rotated during cutting, such as cylindrical grinding, in order to ensure continuous The prestressing force, the force applying mechanism must rotate together with the workpiece, thus increasing the overall inertia, reducing the stability and affecting the machining accuracy

[0005] 2. For specific processing parts, it is usually necessary to design a specific force application device, which is costly

[0006] 3. The size of the prestress is not easy to control, especially in the process of processing, the prestress on the workpiece cannot be adjusted in real time as needed

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