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Ultra-hard abrasive ceramic agglomerate and resin zirconia alumina composite grinding wheel

A super-hard abrasive and ceramic bond technology, applied in the direction of bonding grinding wheel, abrasive, grinding device, etc., can solve the problems of low rail material removal efficiency, fast grinding edge consumption, poor rail surface quality, etc. Wear resistance and removal efficiency, less grinding heat, good surface quality

Inactive Publication Date: 2018-06-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the weak holding force of the resin bond on the abrasive, the abrasive is easy to fall off, resulting in a short service life of the grinding wheel; at the same time, under the high-speed and heavy-load grinding conditions of the corundum abrasive, the grinding edge is consumed quickly and is easy to passivate, resulting in a long-term wear of the grinding wheel. Not sharp enough during use, resulting in high grinding heat, resulting in low removal efficiency of rail material, poor surface quality of rail grinding, and extremely prone to burn bluing

Method used

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  • Ultra-hard abrasive ceramic agglomerate and resin zirconia alumina composite grinding wheel

Examples

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Embodiment 1

[0029] Composite grinding wheel for rail grinding, cuboid sintered blocks with a size of 55×20×10 mm, vitrified bond superabrasive sintered blocks 3, a total of 12 pieces, at an angular interval of 10°, distributed equiangularly over the entire circumference of the working layer of the grinding wheel, of which The rectangular surface of the sintered block with a size of 20 × 5 mm is the grinding surface. The diameter of the grinding wheel is 150 mm, the thickness is 60 mm, and the ring width of the grinding surface of the working layer is 50 mm. The composite grinding wheel is suitable for the turnout grinding train whose model is RGH20C.

[0030] The specific production steps are as follows:

[0031] (1) Weigh diamond, cubic boron nitride, ceramic bond and NaCl particles according to the mass ratio. The mass ratio of diamond and cubic boron nitride mixed abrasive is 60%, and the mass ratio of diamond to cubic boron nitride is 1:1 , the mass proportion of ceramic binder is 3...

Embodiment 2

[0038] Composite grinding wheel for rail grinding, cuboid sintered blocks with a size of 40×10×20 mm, vitrified bond superabrasive sintered blocks 3, a total of 12 pieces, at an angular interval of 15°, distributed equiangularly on the entire circumference of the working layer of the grinding wheel, of which The rectangular surface of the sintered block with a size of 20 × 5 mm is the grinding surface. The diameter of the grinding wheel is 150 mm, the thickness is 60 mm, and the ring width of the grinding surface of the working layer is 50 mm. The composite grinding wheel is suitable for the turnout grinding train whose model is RGH20C.

[0039] The specific production steps are as follows:

[0040] (1) Weigh diamond, cubic boron nitride, ceramic bond and NaCl particles according to the mass ratio. The mass ratio of diamond and cubic boron nitride mixed abrasive is 50%, and the mass ratio of diamond to cubic boron nitride is 1:1 , the mass proportion of ceramic binder is 40%...

Embodiment 3

[0047] Composite grinding wheel for rail grinding, cuboid sintered blocks with a size of 60×30×15 mm, vitrified bond superabrasive sintered blocks 3, a total of 24 pieces, at an angular interval of 15°, distributed equiangularly over the entire circumference of the working layer of the grinding wheel, of which The rectangular surface of the sintered block with a size of 20 × 5 mm is the grinding surface. The diameter of the grinding wheel is 260 mm, the thickness is 60 mm, and the ring width of the grinding surface of the working layer is 50 mm. The composite grinding wheel is suitable for the model GMC-96X grinding train.

[0048] The specific production steps are as follows:

[0049](1) Weigh diamond, cubic boron nitride, ceramic bond and NaCl particles according to the mass ratio. The mass ratio of diamond and cubic boron nitride mixed abrasive is 30%, of which the mass ratio of diamond to cubic boron nitride is 1:1 , the mass ratio of vitrified binder is 50%, and the mas...

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Abstract

The invention discloses a manufacturing method of an ultra-hard abrasive ceramic agglomerate and resin zirconia alumina composite grinding wheel special for grinding of a railway rail. A base body anda working layer of the grinding wheel are included; the working layer of the grinding wheel is formed by compositing of ceramic bond ultra-hard abrasive (including diamond and cubic boron nitrite) agglomerate and a resin bond zirconia alumina abrasive layer; and the pieces of ceramic bond agglomerate are distributed in resin bonds at intervals with the equal angle, and the interval angle is 10-15degrees. According to the manufactured grinding wheel, by utilizing the advantages that diamond abrasives have ultrahigh hardness and sharpness, cubic boron nitrite abrasives are low in friction coefficient, excellent in heat stability and not liable to react with ferrous metal and combining the high toughness of the resin bonds and zirconia alumina abrasives, the sharpness of the grinding wheelfor grinding the rail s improved obviously, the working life of the grinding wheel is prolonged obviously, the burn injury bluing phenomenon of the surface of the rail due to grinding is prevented effectively, and the surface quality of the ground rail is improved significantly.

Description

technical field [0001] The invention relates to a grinding tool, in particular to a composite grinding wheel for rail grinding and a manufacturing method. Background technique [0002] During the use of the railway rail, it bears the interaction force between the wheel and the rail, which leads to rolling contact fatigue and plastic deformation on the surface of the rail material. When the two reach the limit, the surface of the rail will produce cracks, corrugations, fat edges or even peeling off, etc. disease. The occurrence of diseases will seriously affect the safety of trains. Using the rail grinding train to scientifically grind the rail surface to prevent and eliminate rail surface defects is the most effective and economical rail maintenance method, which has become the consensus of the Ministry of Railway Works at home and abroad. [0003] Corundum abrasive wheels with resin bond are widely used in rail grinding trains at present. Due to the weak holding force of...

Claims

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Application Information

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IPC IPC(8): B24D18/00B24D3/14B24D3/28B24D3/34B24D7/06
CPCB24D18/0009B24D3/14B24D3/28B24D3/34B24D7/06
Inventor 肖冰肖皓中吴恒恒肖博
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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