Composite grain diamond grinding wheel for UO2 pebble grinding device

Abstract

The invention relates to a composite grain diamond grinding wheel for UO2 pebble grinding device, comprising a grinding wheel substrate. An adhesive layer and a diamond layer are orderly arranged around the grinding wheel substrate from the internal to the external. The diamond layer is divided into a coarse grinding area and a fine grinding area along the composite diamond grinding spindle according to the difference of the diamond grain, wherein, the length ratio between the coarse grinding area and the fine grinding area is 1:(2-4), the diamond grain of the coarse grinding area is 80 / 100-170 / 200, and the diamond grain of the fine grinding area is 170 / 200-270 / 325. According to the invention, the composite grain diamond grinding wheel integrates coarse grinding, fine grinding and polishing of the UO2 pebble, achieves the UO2 pebble abrasive machining only by one grinding device and one step, in addition, the processing quality is stable, the cost is low.

Description

technical field [0001] The invention relates to a nuclear-pure grade ceramic UO used in the manufacture of reactor nuclear fuel elements 2 Pellet grinding device, in particular to a UO 2 Composite grain size diamond grinding wheel for pellet grinding device. Background technique [0002] Pressurized water reactors and heavy water reactors are currently the nuclear reactor types that are relatively mature and widely used in international nuclear power plants, and most of them are pressurized water reactor nuclear power plants. Both types of nuclear power plant reactors use ceramic fuel elements, that is, nuclear-grade ceramic UO 2 A pellet is a fuel element made as a core. Nuclear grade ceramic UO 2 The core block mainly adopts nuclear pure grade UO 2 Powder is used as a raw material, a cylindrical ceramic core block made by powder pressing and sintering. Since nuclear power fuel elements need to be put into the reactor, in order to ensure the safety and economical oper...

AI Technical Summary

Problems solved by technology

[0003] At present, both at home and abroad, two or three grinding machines are used to complete the UO 2 The grinding process of pellets, and the abrasive tools used for grinding machines are silicon carbide resin bonded grinding wheels with high price and poor durability.

This UO 2 The disadvantages of the pellet grinding process are that the process is complicated, the equipment purchase cost is high, and the equipment operation is difficult. UO 2 The grinding quality of the pellets is unstable, and the recycling cost of the generated grinding slag is high

Although in recent years, diamond grinding wheels have been used to replace silicon carbide resin bonded grinding wheels at home and abroad, the grinding process still has to be divided into rough grinding and fine grinding. The process is relatively long, which affects production costs and economic benefits.

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