Single abrasive particle continuous scratching test method for CBN tool pre-maintenance ferrous metal test piece

Abstract

The invention discloses a single abrasive particle continuous scratching test method for a CBN tool pre-maintenance ferrous metal test piece, and belongs to the field of material performance testing in machining and precision and ultra-precision machining.The ferrous metal test piece is fixed to an electric main shaft, and online dynamic balance is conducted on the test piece; a CBN tool is used for conducting plate repairing on the test piece to meet the requirements for end face run-out and roughness needed for testing; a tool head with the top end fixedly connected with a single abrasive particle is replaced, and tool setting is conducted in the replacing process; finally, scratching testing is conducted, the test piece rotates at an appointed rotating speed, the tool head undercuts to the appointed cutting depth and conducts radial feeding, spiral scratches are formed on the end face of the test piece, and scratching force, acoustic emission signals and physical quantity are acquired by a measuring system in the process.By means of the method, it can be guaranteed that the abrasive particle and the test piece make stable contact on a long scratching distance, high-speed and high-precision scratching is achieved, and related test results can be used in studies of material removal mechanism in the frictional abrasion process and abrasion machining.

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 particle continuous scratching test method for a CBN tool pre-repaired ferrous metal test piece. Background technique [0002] The abrasive grain processing process can be regarded as a cutting process completed by a large number of abrasive grains of various shapes that are unevenly arranged and irregularly distributed on the surface of the abrasive tool. In scientific research, complex phenomena are often abstracted into a simplified model to explore some of the most essential issues. The cutting action of fine abrasive grains is the basis of grinding process. As the basic mode of grinding process, the scratching, plowing and cutting of single abrasive grains have become an important means to understand the complex grinding action. [0003] There are mainly four types ...

AI Technical Summary

Problems solved by technology

The analysis of a large number of existing documents and published patents found that there are corresponding shortcomings in the four test methods: the scratch speed of the linear scratch test and the wedge surface scratch test is insufficient (the highest linear speed is only 4m / s), and it is difficult to simulate well Abrasive particle processing (maximum linear speed up to 200m / s); the ball-on-disk scratch test method is actually a typical tribological test method. The removal method is very different. When the stable friction stage is reached, there is even no material removal. At the same time, the shape accuracy and surface finish of the friction disc are very high; the single pendulum scratch test is considered to be the closest to the material removal process of abrasive particles. However, the stability of the test is poor. Due to the short contact time between abrasive grains and workpieces, the collection of physical quantities in the material removal process such as cutting force has become a difficult problem.

[0004] Some published patents have proposed an improved method for the single abrasive particle test. The single pendulum scratch test method is improved, and the traditional method of static workpiece and abrasive particle rotation is changed to abrasive particle static and workpiece rotation, so as to obtain longer scratches. , so there is a longer time to collect physical quantities such as cutting force, but the papers and products related to these patents have not been retrieved, mainly because the specific implementation of these patent methods has the following problems: due to the increase in the length of the scratches, the impact on abrasive grains and workpieces The relative motion accuracy is required to be greatly improved, but none of the above methods can maintain a high-precision and stable contact state between the abrasive grains and the workpiece, so it is difficult to achieve stable scratching, let alone high-speed and high-precision scratching tests for small-sized abrasive grains

The above problems have greatly restricted the progress of single abrasive scratch test technology.

Images