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Preparation method of porous metal binding agent braze welding diamond grinding wheel

A diamond grinding wheel and porous metal technology, which is applied in metal processing equipment, manufacturing tools, grinding/polishing equipment, etc., can solve the problems of reducing the holding force of metal bond, the abrasive is easy to fall off prematurely, and the strength of the grinding wheel is low. , to achieve the effect of improved chip space, good self-sharpening of the grinding wheel, and not easy to fall off prematurely

Active Publication Date: 2010-12-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this porous metal bond diamond grinding wheel has achieved the desired effect, it also brings more serious problems. The reason for this is that the pore structure in the grinding wheel reduces the holding force of the metal bond to the abrasive. , and the strength of the grinding wheel segment is very low, which causes the abrasive to fall off prematurely and fail during processing. The grinding wheel wears a lot under heavy load grinding and has a short service life. Therefore, this grinding wheel is only used for grinding with a small load. In precision grinding, it shows the performance advantage of easy dressing and sharpening

Method used

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  • Preparation method of porous metal binding agent braze welding diamond grinding wheel

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Embodiment 1

[0010] The preparation process of described emery wheel is as follows:

[0011] 1. Select the active Ni-Cr alloy powder as the binding agent, the WC powder as the skeleton phase, and the ammonium bicarbonate particles as the pore-forming agent. The average particle size of the pore-forming agent is 40 meshes. The WC powder and the The mass fraction of the active Ni-Cr alloy powder is 18, the mass fraction of the pore-forming agent is 4, the mass fraction of the diamond is 1, and the diamond particle size is 80 / 100#. (Diamond particle size, which means the grid size of the sieve, that is to say, the size of the abrasive is basically the same as the size of the sieve. This method is often used in the abrasive particle size industry to express its size. The corresponding particle size can be found according to the sieve)

[0012] 2. Mix the Ni-Cr alloy powder, WC powder, diamond, pore-forming agent and 4 parts by mass of forming agent evenly, and then fill the mixed powder in a m...

Embodiment 2

[0017] A kind of preparation method of porous metal bond brazed diamond grinding wheel, preparation step comprises: a. the preparation of grinding wheel segment: take WC powder, active Ni-Cr alloy powder, ammonium bicarbonate particle and diamond as raw material, each composition distribution such as Bottom: WC powder: 10 parts by mass; active Ni-Cr alloy powder: 10 parts by mass; pore forming agent: 1 part by mass; forming agent: 2 parts by mass; Active Ni-Cr alloy powder is in liquid phase during sintering and is a binder; ammonium bicarbonate particles are pore-forming agents with a particle size of 20 mesh; the forming agent is polyvinyl butyral and absolute ethanol in a mass ratio of 1 : 10 uniformly mixed solution; earlier, the WC powder, Ni-Cr alloy powder, diamond, pore-forming agent particles and forming agent are mixed uniformly according to the above ratio, and then the mixed powder is filled in a designed mold and cold-pressed, The molding pressure is 300MPa, the p...

Embodiment 3

[0019]A kind of preparation method of porous metal bond brazed diamond grinding wheel, preparation step comprises: a. the preparation of grinding wheel segment: take WC powder, active Ni-Cr alloy powder, ammonium bicarbonate particle and diamond as raw material, each composition distribution such as Bottom: WC powder: 25 parts by mass; active Ni-Cr alloy powder: 25 parts by mass; pore forming agent: 8 parts by mass; forming agent: 8 parts by mass; Active Ni-Cr alloy powder is in liquid phase during sintering and is a binder; ammonium bicarbonate particles are pore-forming agents with a particle size of 60 mesh; the forming agent is polyvinyl butyral and absolute ethanol in a mass ratio of 1 : 20 uniformly mixed solution; earlier, the WC powder, Ni-Cr alloy powder, diamond, pore-forming agent particles and forming agent are mixed uniformly according to the above ratio, and then the mixed powder is filled in a designed mold and cold-pressed, The molding pressure is 800MPa, the p...

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Abstract

The invention provides a preparation method of a porous metal binding agent braze welding diamond grinding wheel, comprising the following steps of preparing a grinding wheel segment block and connecting the grinding wheel segment block with a grinding wheel base body. The prepared porous metal binding agent braze welding diamond grinding wheel has 45-70 percent of porosity, and the bending strength of three points of the grinding wheel segment block is 75-200 MPa. Because of the introduction of a pore structure, the trimming and sharpening ability, the grinding material exposure ability and a chips-containing space of the novel grinding wheel are greatly improved compared with the compact metal binding agent grinding wheel, the grinding wheel has favorable self-sharpening property, favorable durability and high processing efficiency, and can bear heavier load when crisp and hard materials are grinded; meanwhile, the grinding wheel segment block has high strength, the metal binding agent has favorable holding force on the grinding material, and the grinding material does not fall off easily and prematurely.

Description

technical field [0001] The invention belongs to the field of manufacturing superhard abrasives, in particular to a method for preparing a diamond grinding wheel brazed with a porous metal bond. Background technique [0002] Traditional metal-bonded superabrasive tools are all dense. In order to pursue high holding force on abrasives in the manufacture of tools, their density is generally used as an important index to measure the quality of grinding wheel manufacturing. Due to the high densification of the metal bond superabrasive grinding wheel, it is difficult to reshape and sharpen the tool at the beginning of its use and after wear, and it is difficult to remove the abrasive from the grinding wheel, and the chip space is small, and the grinding wheel is prone to occur during the grinding process. The clogging problem has always been an insurmountable problem for dense metal bond diamond grinding wheels in use. In order to solve the difficult problem of dressing and sharp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24D18/00
Inventor 苏宏华傅玉灿赫青山徐九华冯晓杰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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