Thickness changeable structure grinding wheel for super-high-speed grinding

Abstract

The invention discloses a thickness changeable structure grinding wheel for super-high-speed grinding. The thickness changeable structure grinding wheel for the super-high-speed grinding includes a grinding wheel base body, a bond layer and an abrasive layer, wherein the grinding wheel base body includes a hub, a rim and a middle portion for connecting the hub and the rim, and the bond layer and the abrasive layer are arranged on the excircle surface of the rim. The thickness changeable structure grinding wheel for the super-high-speed grinding is characterized in that the middle portion is a revolution surface, and the corresponding generatrix of the revolution surface is an exponential function curve; six balance holes are arranged on the circumference of the inside of the hub, and the inside of every balance hole is provided with a balance screw; the grinding wheel base body is made of TC4 titanium alloy materials, the surface of the grinding wheel base body is distributed with Ag-Cu-Ti (silver-copper-titanium) brazing filler metal as the bond, single layer CBN (cubic boron nitride) superhard abrasive grains are distributed on the surface of the grinding wheel base body, the high strength connection between the abrasive grains and the grinding wheel base body is achieved through high-frequency induction brazing technique, and the grinding speed can reach 600 miles per second.

Description

Technical field: [0001] The invention relates to the field of ultra-high-speed grinding, in particular to a variable-thickness structure grinding wheel for ultra-high-speed grinding. Background technique: [0002] Ultra-high-speed grinding is an important part of advanced manufacturing technology in the field of mechanical processing. It is a process method to improve the metal removal rate and workpiece processing quality by increasing the grinding wheel linear speed (ie, grinding speed). It applies high efficiency and high precision , Highly automated and highly flexible grinding equipment can maximize the processing efficiency, processing accuracy and surface quality of workpieces. As high-end industries such as energy, automobiles, and aerospace have higher and higher requirements for machining accuracy and efficiency of parts, many developed countries in the world have included research on ultra-high-speed grinding technology and equipment as an important topic in the f...

AI Technical Summary

Problems solved by technology

Most of the high-speed and ultra-high-speed grinding wheel structures commonly used in laboratories today are structures with flange mounting holes in the center of the base body, and the diameter and thickness of the grinding wheel are large. Installed on a high-precision, high-speed electric spindle, and with the increase of the spindle speed, the centrifugal force generated by the matrix due to its own mass will increase as the square of the speed, so the central through hole will expand under the action of centrifugal stress, resulting in The gap between the flange and the grinding wheel substrate increases, the positioning accuracy is greatly reduced, and the grinding wheel substrate is easy to expand and deform, which reduces the grinding accuracy and is not conducive to the study of ultra-high-speed grinding mechanism; on the other hand, for ultra-high-speed grinding, the spindle speed Extremely high, an air barrier will be formed around the grinding wheel, a large amount of heat will be generated due to friction between the surface of the grinding wheel and the air, and a part of the spindle power will be consumed. However, the current commonly used grinding wheel structure is composed of several planes between the hub and the rim , in contrast, this part uses a curved surface instead of a plane, the surface of the grinding wheel will obtain better air flow characteristics, reduce the influence of the air barrier effect, and at the same time realize the uniform stress distribution of the entire grinding wheel matrix to the greatest extent, and approximate equal strength

At present, some researchers have used simulation optimization software to optimize the simulation analysis of the grinding wheel structure, but the general route is to first give a few fixed-point coordinates and then perform simulation optimization, and finally obtain an ultra-high-speed grinding wheel structure with a curved surface. The geometric relationship or expression of the curved surface is uncertain, and it is very difficult to process the structure of the ultra-high-speed grinding wheel. So far, there has been no relevant report mentioning that the ultra-high-speed grinding wheel structure is processed by this route for the study of ultra-high-speed grinding mechanism

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