Super-hard CBN grinding wheel and preparation method thereof

A grinding wheel, super-hard technology, used in manufacturing tools, metal processing equipment, grinding/polishing equipment, etc., can solve the problems of high operating temperature, chip adhesion and clogging, difficult high-speed machining, etc., to improve grinding speed, reduce Power loss and high grinding accuracy

Inactive Publication Date: 2018-11-16
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional superhard abrasives (grinding wheels) are mostly manufactured by resin, ceramics, metal bond sintering and electroplating. The problem is that single crystal particles are only mechanically embedded in the bond and electroplating layer, and bond and Weak force between plating layers
Specifically, although the resin bond is relatively easy to process and repair, it has poor heat resistance, low bonding strength, serious abrasive shedding, and seriously affects efficiency; the vitrified bond is relatively easy to repair and has a high service temperature, but it is brittle and impact toughness. Poor fatigue, prone to brittle cracking, difficult to use in high-speed machining
Although metal bond sintering has strong heat resistance, chemical metallurgical bonding cannot occur between the bond and the abrasive grains, so the abrasive grains are only mechanically embedded in the bond with limited holding power; abrasive grains in metal electroplating are only mechanically embedded
Therefore, it is easy to cause the overall failure of the grinding wheel due to the particle shedding of the abrasive and the peeling off of the coating in flakes. This situation is especially obvious when the more difficult-to-process materials are efficiently ground; in addition, the coating is thick, the exposure height of the abrasive is low, and the chip space is small. , it is easy to fail due to the adhesion and clogging of chips during grinding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of superhard CBN emery wheel, it comprises steel core, abrasive material circle, and steel core and abrasive material circle are combined by resin adhesive, and wherein, abrasive material circle is prepared by following component by mass percentage: CBN abrasive material: 45%, metal Bonding agent: 49%, auxiliary bonding agent: 6%, the sum of the mass percentage of CBN abrasive, metal bonding agent and auxiliary bonding agent is 100%; the mass percentage of described metal bonding agent containing composition is: Cu60Sn40 powder: 85% %, TiH 2 Powder: 15%, Cu60Sn40 powder and TiH 2 The sum of the powder mass percentages is 100%; the abrasive ring composition is by volume percentage: 40% of CBN abrasive, 35% of metal bond, and 25% of pores, and the sum of the volume percentage of CBN abrasive, metal bond and pores is 100%; CBN abrasive, Cu60Sn40 powder and TiH 2 The particle size of the powder is 60 μm; the auxiliary binder is acrylic emulsion.

[0038] The prepa...

Embodiment 2

[0055]A superhard CBN grinding wheel, which includes a steel core, an abrasive ring, the steel core and the abrasive ring are combined by a resin adhesive, wherein the abrasive ring is prepared from the following components according to the mass percentage: CBN abrasive: 40%, metal Bonding agent: 54%, auxiliary bonding agent: 6%, the sum of the mass percentage of CBN abrasive, metal bonding agent and auxiliary bonding agent is 100%; the mass percentage of described metal bonding agent containing composition is: Cu60Sn40 powder: 85% %, TiH 2 Powder: 15%, Cu60Sn40 powder and TiH 2 The sum of the powder mass percentages is 100%; the abrasive ring composition is by volume percentage: 35% of CBN abrasive, 40% of metal bond, and 25% of pores, and the sum of the volume percentage of CBN abrasive, metal bond and pores is 100%; CBN abrasive, Cu60Sn40 powder and TiH 2 The particle diameters of the powders are all 120 μm; the auxiliary binder is an acrylic emulsion.

[0056] The prepa...

Embodiment 3

[0073] A kind of superhard CBN emery wheel, it comprises steel core, abrasive material circle, and steel core and abrasive material circle are combined by resin adhesive, and wherein, abrasive material circle is prepared by the following components by mass percentage: CBN abrasive material: 47%, metal Bonding agent: 47%, auxiliary bonding agent: 6%, the sum of the mass percentage of CBN abrasive, metal bonding agent and auxiliary bonding agent is 100%; the mass percentage of described metal bonding agent containing composition is: Cu60Sn40 powder: 88 %, TiH 2 Powder: 12%, Cu60Sn40 powder and TiH 2 The sum of the powder mass percentages is 100%; the abrasive ring composition is by volume percentage: 41% of CBN abrasive, 37% of metal bond, 22% of pores, and the sum of the volume percentage of CBN abrasive, metal bond and pores is 100%; CBN abrasive, Cu60Sn40 powder and TiH 2 The particle diameters of the powders are all 150 μm; the auxiliary binder is acrylic emulsion.

[007...

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Abstract

The invention discloses a super-hard CBN grinding wheel and a preparation method thereof, and belongs to the field of super-hard abrasives. The grinding wheel comprises a steel core and an abrasive ring. The steel core and the abrasive ring are combined by a resin binder and a resin adhesive. The abrasive ring is prepared by a CBN abrasive, a metal bond and an auxiliary binder. The metal bond contains Cu60Sn40 powder and TiH<2> powder. The abrasive ring is composed of the CBN abrasive, the metal bond and pores. The preparation method comprises the steps that (1) the CBN abrasive, the Cu60Sn40powder and the TiH<2> powder are mixed to obtain a mixture A; (2) the auxiliary binder is mixed with the mixture A to obtain a mixture B; (3) the mixture B is dried; (4) the dried mixture B is sieved;(5) the sieved mixture B is subjected to cold press forming to obtain a green body of the abrasive ring; (6) the green body of the abrasive ring is sintered in an inert atmosphere and then cooled toobtain a blank of the abrasive ring; and (7) the blank of the abrasive ring is bonded to the steel core with the resin adhesive to obtain the super-hard CBN grinding wheel.

Description

technical field [0001] The invention relates to the field of superhard abrasives, in particular to a superhard CBN grinding wheel and a preparation method thereof. Background technique [0002] With the development of modern machining in the direction of high precision, high speed, hard machining, dry machining (no coolant) and cost reduction, quite high requirements are put forward for the performance of abrasive tools. Traditional silicon carbide and corundum ordinary abrasive molds can no longer fully meet the current high-speed, high-efficiency, and high-precision grinding requirements. Therefore, it is an inevitable development to develop various superhard grinding materials with excellent wear resistance and stable processing for a long time trend. Currently commonly used superhard grinding materials include cubic boron nitride (CBN) and diamond abrasives. Although the hardness of cubic boron nitride abrasive is lower than that of diamond, it is still much higher tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24D3/06B24D3/34B24D18/00
CPCB24D3/06B24D3/342B24D3/346B24D18/0009
Inventor 王聪范永刚
Owner NORTHEASTERN UNIV
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