A test method for the continuous scratching interference behavior of single abrasive grains on ferrous metal specimens pre-repaired by CBN tools

Abstract

The invention discloses a testing method of a continuous scratching interference behavior of a single abrasive grain of a black metal test piece pre-repaired by a CBN tool and belongs to the fields of material performance testing and precise and ultra-precise machining during machining. Due to the fact that the black metal test piece is fixed to an electric main shaft and subjected to online dynamic balance; then the CBN tool is adopted for repairing a disk of the test piece, and the requirements for end face bouncing and roughness required for testing are met; a tool bit with the top end fixedly connected with the single abrasive grain is installed through replacement, and tool setting is performed in the replacement process; finally, a scratching test is started, the test piece rotates at an assigned speed, the tool bit performs radial feeding at assigned cutting depth, interference spiral scratches are formed on the end face of the test piece, and a measurement system acquires scratching force, an acoustic emission signal and other physical quantity in the process. The method can simulate the interference behavior between abrasive grains in the high-speed grinding process. A relevant testing result can be used for deep research of a grinding mechanism and optimization of grinding parameters.

Description

technical field [0001] The invention belongs to the field of material performance testing and precision and ultra-precision machining in mechanical processing, and in particular relates to a single abrasive grain continuous scratching interference behavior test method of a CBN tool pre-repaired ferrous metal test piece. Background technique [0002] The grinding process can be regarded as a cutting process completed by a large number of unevenly arranged and irregularly distributed abrasive particles of various shapes on the surface of the abrasive tool. In scientific research, complex phenomena are often abstracted into a simplified model to explore some essential issues. The cutting effect of the fine abrasive grains that make up the grinding wheel is the basis of the grinding process. As the basic mode of the grinding process, the cutting of a single abrasive grain has become an important means to understand the complex grinding action. In the actual grinding process, th...

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Problems solved by technology

[0003] Many scholars have done a lot of work on the scratching experiment of single abrasive particles, and developed related test methods and devices. However, due to the lack of test methods and test devices, the influence of multiple abrasive particles interference has not been considered. Most of the research on the mutual interference of abrasive particles is still in the simulation stage, such as using Boolean operations to simulate the material removal of the abrasive particle interference process, or using numerical simulation methods to model and analyze the interference process of multiple abrasive particles

There are also a small number of devices that study the mutual interference of multiple abrasive grains, such as arranging multiple abrasive grains at a certain relative angle and radial spacing, which will produce interference effects when scratching, but the radial spacing of multiple abrasive grains The arrangement error is relatively large (resolution 10μm), so when multiple abrasive particles interfere, the control accuracy of the actual interference amount is not higher than 10μm, so only some large-size (greater than 100μm) abrasive particles can be tested for interference, and the equipment structure Complicated, the adjustment process largely depends on the operator's experience, without automatic adjustment and position feedback control, so it is difficult to achieve high-precision interference behavior testing

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