Preparation method of CBN ceramic high-speed grinding wheel used for high-speed grinding of air valve of internal combustion locomotive

A technology for diesel locomotives and ceramics, applied in the field of electromechanical equipment, can solve the problems of CBN strength loss, affecting grinding wheel cutting efficiency, CBN abrasive sharp corner passivation, etc., to achieve the effect of unchanged strength, improved wrapping ability, and reduced sintering temperature

Active Publication Date: 2014-02-12
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

[0003] The CBN vitrified grinding wheel is mainly composed of a steel substrate and a working abrasive layer. The main components of the working abrasive layer are vitrified bond and CBN. The firing temperature of traditional CBN vitrified bond is generally The flexural strength is generally 75MPa. At this temperature, the strength of CBN loses about 10%, and the sharp corners of CBN abrasives are passivated.
The stronger the strength of the vitrified bond, the longer the dressing cycle of the grinding wheel and the higher the service life; in addition, the sharp angle and strength of CBN also affect the cutting efficiency of the grinding wheel

Method used

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  • Preparation method of CBN ceramic high-speed grinding wheel used for high-speed grinding of air valve of internal combustion locomotive
  • Preparation method of CBN ceramic high-speed grinding wheel used for high-speed grinding of air valve of internal combustion locomotive
  • Preparation method of CBN ceramic high-speed grinding wheel used for high-speed grinding of air valve of internal combustion locomotive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Preparation of binder

[0025] 1. Pre-melted ceramic powder

[0026] Weigh the ingredients in Table 1 according to the weight ratio and analyze the pure raw materials→mix evenly→fire at a high temperature of 1400 degrees→water cooling→crushed through a 500 standard sieve→dry the powder under the sieve;

[0027] The obtained powder is pre-melted ceramic powder.

[0028] 2. Binder mixing

[0029] Take one part of nano material titanium dioxide + nine parts of pre-melted ceramic powder according to the mass, and use a ball mill to mix them evenly, and the obtained product is a binder.

[0030] Table 1

[0031] Al 2 o 3

SiO 2

Na 2 o

MgO

K 2 o

B 2 o 3

33

40

3

1

4

9

[0032] 2. Preparation of ceramic CBN grinding wheel grinding working layer

[0033] Weigh the grinding working layer in Table 2 according to the volume ratio

[0034] Table 2:

[0035] Item Name

Ratio...

Embodiment 2

[0053] The only difference between embodiment 2 and embodiment 1 is that the material weight ratio of table 1 is different, see table 5;

[0054] table 5

[0055] al 2 o 3

SiO 2

Na 2 o

MgO

K 2 o

B 2 o 3

25

48

4

1.5

5

8

[0056] Table 6 compares the parameters of similar products processed by Example 1 of the present invention and Japan's Toyota Wanmo grinding wheel:

[0057] Table 6

[0058]

[0059]

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Abstract

The invention discloses a preparation method of a CBN ceramic high-speed grinding wheel used for high-speed grinding of an air valve of an internal combustion locomotive. Pre-melting ceramic powder is prepared from following components by weight: 25-33 of Al2O3, 40-48 of SiO2, 3-4 of Na2O, 1-1.5 of MgO, 4-5 of K2O and 8-9 of B2O3. A binding agent is prepared by sintering 1 part of nanoscale titanium dioxide and 9 parts of the pre-melting ceramic powder according to a preset temperature curve. The firing temperature of the ceramic binding agent is 730 DEG C, but the breaking strength of the ceramic binding agent can reach 110 MPa. At the temperature, the CBN strength has nearly no loss and cutting edge angles are clear, thus largely improving machinability of the CBN grinding wheel.

Description

Technical field: [0001] The invention relates to the field of electromechanical equipment, in particular to a preparation method of a CBN ceramic high-speed grinding wheel, more specifically a preparation method of a CBN ceramic high-speed grinding wheel used for high-speed grinding of train diesel locomotive air valves. Background technique: [0002] The gas valve of diesel locomotive is an extremely difficult workpiece to grind. The CBN grinding wheel has been imported from Germany for grinding this workpiece in China. However, even if the imported grinding wheel is stable during the processing process, the surface quality of the workpiece still has a certain gap with the requirements. For this situation , there is an urgent need for a CBN ceramic high-speed grinding wheel for high-speed grinding of train diesel locomotive valves. [0003] The CBN vitrified grinding wheel is mainly composed of a steel substrate and a working abrasive layer. The main components of the worki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/515C04B35/622C04B35/64
Inventor 吕升东王昆郑勇阁
Owner 沈阳中科超硬磨具磨削研究所
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