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Magnetic abrasive material and preparation method thereof

A magnetic abrasive and nitriding technology, which is applied in chemical instruments and methods, and other chemical processes, can solve the problems of easy shedding of abrasive grains, and achieve the effects of simple preparation method, low energy consumption, and low nitriding temperature

Active Publication Date: 2015-12-09
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a magnetic abrasive without a phase interface between a ferromagnetic phase and an abrasive grain phase and a preparation method thereof, so that components with grinding ability are produced in situ in the ferromagnetic phase, fundamentally solving the problem that the abrasive grain phase is easy to fall off question

Method used

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  • Magnetic abrasive material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 40-mesh iron powder into a high-temperature furnace at 450°C, pass in nitrogen gas to replace the air in the furnace and connecting parts, then turn off the nitrogen gas, and then pass in ammonia gas to replace the nitrogen in the furnace chamber, so that the pressure in the furnace chamber is 0.5MPa, after that, Control the flow rate of ammonia gas to 1L / min. After the nitriding reaction has been carried out for 3 hours, turn off the ammonia gas, and replace the ammonia gas in the furnace cavity and connecting parts with nitrogen gas. Take it out from the furnace cavity, cool it in water, take out the powder and dry it to obtain magnetic abrasive material A. The ammonia gas flowing out of the high temperature furnace is absorbed by dilute sulfuric acid.

[0023] Abrasive performance test conditions are:

[0024] Workpiece to be processed: 45# steel flat workpiece, initial surface roughness Ra is 1.43μm; magnetic pole: cylindrical φ16mm×L30mm, magnetic induction in...

Embodiment 2

[0027] Put 40-mesh iron powder into a high-temperature furnace at 450°C, pass in nitrogen gas to replace the air in the furnace and connecting parts, then turn off the nitrogen gas, and then pass in ammonia gas to replace the nitrogen in the furnace chamber, and then make the furnace chamber pressure 0.5MPa, Control the flow rate of ammonia gas to 1L / min. After the nitriding reaction has been carried out for 3 hours, turn off the ammonia gas, and replace the ammonia gas in the furnace cavity and connecting parts with nitrogen gas. Take it out from the furnace cavity, cool it to room temperature in the air, and obtain the magnetic abrasive material B. The ammonia gas flowing out of the high temperature furnace is absorbed by dilute sulfuric acid.

[0028] Abrasive performance test conditions are:

[0029] Processed workpiece: No. 1 TC titanium alloy plate, initial surface roughness Ra is 2.70μm; magnetic pole: cylindrical φ16mm×30mm, magnetic induction: 700-800mT, rotation spe...

Embodiment 3

[0032] Nitriding was carried out with 60-mesh iron powder, and other preparation conditions were the same as in Example 1 to obtain Magnetic Abrasive C.

[0033] According to the same abrasive performance testing conditions as in Example 1, the magnetic abrasive C is used for grinding, so that the surface roughness of the workpiece to be processed is 0.15 μm.

[0034] According to the same abrasive performance testing conditions as in Example 2, the No. 1 TC titanium alloy plate has an initial surface roughness Ra of 4.33 μm, and other conditions remain unchanged. Grinding with magnetic abrasive C makes the surface roughness of the processed workpiece 0.054 μm.

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Abstract

The present invention discloses a magnetic abrasive material and a preparation method thereof, wherein iron powder or iron-based alloy powder is subjected to a high temperature nitriding reaction from outside to inside so as to form the component iron nitride having the grinding capacity in an in-situ manner, and the iron nitride has characteristics of high hardness, magnetization capability and corrosion resistance. According to the present invention, with the abrasive material, the problem of easy shedding of the abrasive particles is solved, and the abrasive material has characteristics of long service life and grinding capacity increasing; after the grinding material of the present invention is used to carry out magnetic grinding on the 45 steel plane work-piece with a starting surface roughness Ra of 1.43 [mu]m, the surface roughness of the work-piece is 0.124-0.147 [mu]m, and the service life of the abrasive material is 60 min; and the preparation process is simple, the nitriding temperature is low, the energy consumption is low, and the product does not require crushing and screening.

Description

technical field [0001] The invention belongs to the technical field of magnetic grinding, and relates to a magnetic abrasive and a preparation method thereof. Background technique [0002] Magnetic grinding and finishing is a technology that uses magnetic brushes formed by magnetic abrasives in a magnetic field to grind the surface of workpieces. It is flexible, self-adaptive, self-sharpening and controllable, and is suitable for parts such as planes, curved surfaces and microtubes. Skin finishing is widely used in manufacturing industries such as machinery, molds, automobiles, bearings, semiconductors and aviation. [0003] Magnetic abrasives play a decisive role in improving grinding efficiency, precision and surface quality. The development of magnetic grinding technology depends on the development of magnetic abrasives with good processing effect, low cost and long service life. [0004] Magnetic abrasives have both magnetization and grinding capabilities, and single-pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/14
Inventor 王绍艳谭晓旭陈燕牛凤丽李红霞李硕凌玮
Owner UNIV OF SCI & TECH LIAONING
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