Preparation method of ordered diamond brazing grinding wheel with porous structure

Abstract

The invention relates to a preparation method of an ordered diamond brazing grinding wheel with a porous structure. The preparation method comprises the steps that firstly, mixed powder composed of CuSn powder (92%-95% of Cu and 5%-8% of Sn), Fe2O3 powder, rare earth element lanthanum and pore forming agent ammonium bicarbonate is subjected to pre-pressing forming and overall sintering to preparea grinding wheel blank of the porous structure; secondly, multi-layer ordered punching is achieved through a laser or electric spark technology, small holes are filled with feed composed of diamond abrasive particles, CuSn powder (82%-85% of Cu and 15%-18% of Sn) and TiH2 powder, and the small holes are sealed; and then the whole body is sintered to prepare the ordered diamond brazing grinding wheel. The obtained brazing grinding wheel has the beneficial effects that the abrasive particles are integrally and orderly arranged, a chip containing space is large, and the heat dissipation capacityis high; and the abrasive particles are large in holding force, not prone to falling off too early and suitable for efficient low-damage grinding machining of engineering ceramics, hard alloy and other difficult-to-machine materials.

Description

technical field [0001] The invention relates to a novel grinding wheel preparation technology in the field of advanced manufacturing, in particular to a method for preparing an ordered diamond brazing grinding wheel with a porous structure. Background technique [0002] At present, diamond grinding wheels have been widely used in the high-efficiency and precise machining of difficult-to-machine materials such as engineering ceramics and cemented carbide, but the grinding wheels prepared by traditional processes have the following problems: 1. The abrasive grains mainly rely on mechanical embedding or physical adsorption. Because of its function, it is held in the grinding wheel bond, and its holding strength is limited, and the abrasive grains are easy to fall off prematurely during the grinding process; 2. The abrasive grains are randomly distributed in the grinding wheel bond, and the space for chip holding is limited, and the heat dissipation capacity is poor; 3. The grin...

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Problems solved by technology

[0002] At present, diamond grinding wheels have been widely used in the high-efficiency and precise machining of difficult-to-machine materials such as engineering ceramics and cemented carbide, but the grinding wheels prepared by traditional processes have the following problems: 1. The abrasive grains mainly rely on mechanical embedding or physical adsorption. Because of its function, it is held in the grinding wheel bond, and its holding strength is limited, and the abrasive grains are easy to fall off prematurely during the grinding process; 2. The abrasive grains are randomly distributed in the grinding wheel bond, and the space for chip holding is limited, and the heat dissipation capacity is poor; 3. The grinding wheel bond is relatively tight, especially for metal bonded grinding wheels, it is difficult to dress the grinding wheel, which affects the processing efficiency

However, the ordered fiber grinding wheel prepared by the above process has the following main problems: 1. The process of orderly arranging diamond fibers or PDC fibers is very cumbersome, especially when the fiber size is small, the labor intensity is high and the cost is high; 2. Diamond fibers In the subsequent hot-press forming process, the phenomenon of displacement will inevitably occur, and the arrangement parameters and arrangement methods will be affected; 3. After the PDC fiber wears and loses its cutting ability, how to trim and sharpen is also a difficult problem

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