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Preparation technology of CBN (cubic boron nitride) ceramic grinding wheel for wholly grinding end surface and outer circle of crank shaft flange

A ceramic grinding wheel and flange technology, applied in abrasives, manufacturing tools, metal processing equipment, etc., can solve problems such as affecting the cutting efficiency of grinding wheels, and achieve the effects of improving wrapping capacity, low firing temperature and high flexural strength

Active Publication Date: 2014-07-30
沈阳中科超硬磨具磨削研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CBN sharp angle and strength affect the cutting efficiency of grinding wheel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of binder

[0023] 1. Pre-melted ceramic powder

[0024] a. Mixing of raw materials: according to the following ratios by volume, boron anhydride 20, lepidolite 35, albite feldspar 40, Na 2 CO 3 5 mix the raw materials;

[0025] b. High temperature firing at 1600℃;

[0026] c, water cooling to normal temperature;

[0027] d. Broken and passed through a 240-mesh standard sieve;

[0028] e. The powder under the sieve is dried, and the obtained powder is pre-melted ceramic powder

[0029] 2. Binder mixing

[0030] Nanoscale AL 2 o 3 Powder, nano-scale mullite powder, and preheated ceramic powder are mixed evenly by ball milling at a mass ratio of 2:2:6, and the resulting product is a low-temperature binder.

[0031] Ceramic abrasive layer preparation

[0032] a. Measure the materials of the end surface abrasive layer according to the following volume percentages: 35% of low-temperature binder, 5% of white corundum, 10% of aluminum oxide hollow balls, ...

Embodiment 2

[0036] Preparation of binder

[0037] 1. Pre-melted ceramic powder

[0038] a. Mixing of raw materials: according to the following volume fraction ratio boron anhydride 15, lepidolite 40, albite 35, Na 2 CO 3 10 mix the ingredients;

[0039] b. High temperature firing at 1600℃;

[0040] c, water cooling to normal temperature;

[0041] d. Broken and passed through a 240-mesh standard sieve;

[0042] e. The powder under the sieve is dried, and the obtained powder is pre-melted ceramic powder

[0043] 2. Binder mixing

[0044] Nanoscale AL 2 o 3 Powder, nano-scale mullite powder, and preheated ceramic powder are mixed evenly by ball milling at a mass ratio of 2:2:6, and the resulting product is a low-temperature binder.

[0045] Ceramic abrasive layer preparation

[0046] a. Measure the materials of the end surface abrasive layer according to the following volume percentages: 35% of low-temperature binder, 5% of white corundum, 10% of aluminum oxide hollow balls, and 50...

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Abstract

The invention relates to a preparation technology of a CBN (cubic boron nitride) ceramic grinding wheel for wholly grinding the end surface and the outer circle of a crank shaft flange, which comprises the following steps: mixing the following raw materials in parts: 15-20 parts of boric anhydride, 35-45 parts of lepidolite, 30-40 parts of soda feldspar and 5-10 parts of Na2CO3; firing at high temperature; carrying out ball milling on nano Al2O3 powder, nano mullite powder and the pre-molten ceramic powder according to a mass ratio of 2:2:6, and uniformly mixing to obtain a bonding agent; based on the volume percent, uniformly mixing 35% of low-temperature bonding agent, 5% of white alundum, 10% of Al2O3 hollow sphere and 50% of CBN, and prepressing into a sheet to obtain an end surface abrasive layer; based on the volume percent, uniformly mixing 35% of bonding agent, 8% of white alundum, 7% of Al2O3 hollow sphere and 50% of CBN, and prepressing into a sheet to obtain an outer circle abrasive layer; laminating the end surface abrasive layer sheet and the outer circle abrasive layer sheet, and adding the two sheets to an aqueous polyvinyl alcohol solution; and pressing into a fixed shape, and sintering in a high-temperature furnace. The bonding agent has low firing temperature, high folding strength and favorable abrasive binding property; the invention improves the abrasive wetting property of the bonding agent, improves the cutting efficiency of the abrasive, lowers the cost, enhances the abrasive coating capability and strength of the bonding agent and raises the sintering temperature of the bonding agent; and the strength of the CBN is not changed, and the surface is not subjected to burning loss.

Description

technical field [0001] The invention relates to a preparation method of a grinding wheel, in particular to a preparation method of a CBN ceramic grinding wheel used for integral grinding of the outer circle of the flange end face of an automobile crankshaft. technical background [0002] As the crankshaft, an important part of the engine, the precision of the flange directly affects the performance of the engine. At present, there is no grinding wheel preparation technology for simultaneous grinding of the flange outer circle and the end face in China. It is urgent to develop a method for the overall flange end face of the automobile crankshaft Grinding CBN ceramic high-speed grinding wheel preparation technology. [0003] CBN grinding wheel is also called cubic boron nitride grinding wheel. CBN is another superhard material besides diamond. It is mainly used to make grinding wheels and knives. The sharp particles of CBN grinding wheel are suitable for grinding all kinds of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24D3/14B24D3/00
Inventor 郑勇阁王昆吕升东李延海
Owner 沈阳中科超硬磨具磨削研究所
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