Low-temperature high-strength devitrified glass ceramics bond cubic boron nitride grinding wheel

Abstract

The invention discloses a cubic boron nitride grinding wheel with low-temperature and high-strength microcrystalline glass ceramic binder. The cubic boron nitride grinding wheel consists of a matrix, a binding course and a grinding wheel block. The grinding wheel block is a cubic boron nitride grinding wheel block, and adopts the following raw materials (according to the weight percentage of the content): 45 to 80 percent of cubic boron nitride abrasive, 0 to 20 percent of corundum, and 20 to 35 percent of ceramic binder; the ceramic binder is the microcrystalline glass ceramic binder, and the raw material composition and the weight percentage content is as follows: 40 to 70 percent of SiO2, 5 to 25 percent of B2O3, 2 to 5 percent of Al2O3, 2 to 15 percent of Na2O, 2 to 5 percent of K2O, 2 to 4 percent of MgO, 2 to 4 percent of CaO, 1 to10 percent of Li2O, 2 to 5 percent of ZrO2 and 2 to 5 percent of Sb2O3. The invention provides a high efficiency grinding tool which has the advantages that the using linear speed of the grinding wheel can be 160 m / s, the process precision is high, the service life is long, the environment pollution is avoided, and the high efficiency grinding tool can be matched with a high speed high efficiency numerical control crankshaft grinder and is mainly used in the grinding machining of car crank shafts and various numerical control.

Description

technical field [0001] The invention relates to grinding tools, and relates to various high-speed numerical control grinding processes, in particular to a low-temperature, high-strength glass-ceramic bonded cubic boron nitride (CBN) grinding wheel for grinding an automobile crankshaft. Background technique [0002] The crankshaft is one of the most important parts of the engine. It is known as the backbone of the engine. It is an important part of the engine that withstands impact loads and transmits power. It is the most difficult to guarantee the processing quality among the five major parts of the engine. Due to the harsh working conditions of the crankshaft, the requirements for the crankshaft material, processing technology, precision, surface roughness, heat treatment, surface strengthening, and dynamic balance are very strict. If the quality of any link is not guaranteed, it can seriously affect the service life of the crankshaft and the reliability of the whole machi...

AI Technical Summary

Problems solved by technology

The processing efficiency, shape retention, durability and service life of ordinary abrasive grinding wheels are all low, and frequent dressing or replacement is required, so the loss of dressing tools is accelerated, the auxiliary time and labor intensity are increased, which not only affects production efficiency, but also increases production costs. It is also difficult to ensure the consistency of the dimensional accuracy and tolerance of the processed workpiece

In addition, due to the large amount of grinding wheel used, its quality fluctuation also affects the stability of the grinding process, and due to the generation of a large number of grinding residues, the amount of grinding fluid to be filtered and cleaned is increased, causing certain pollution to the environment

With the emergence and development of high-efficiency and high-speed CNC special grinding machines, the requirements for the use speed, processing efficiency, service life and dressing frequency of cubic boron nitride grinding wheels are getting higher and higher, and the current grinding wheels are difficult to meet their requirements.

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