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A method for suppressing cracking damage in grinding of hard and brittle materials by surface toughening

A grinding technology for hard and brittle materials, which is applied in the field of surface toughening to suppress cracking damage in grinding and processing of hard and brittle materials. It can solve the problems of diamond grinding wheel temperature rise, operation difficulty and high cost, and heat sensitivity of hard and brittle materials. , to achieve the effect of reducing processing cost, improving processing quality and improving processing efficiency

Inactive Publication Date: 2020-05-15
ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice has proved that the method of auxiliary heating and grinding can effectively reduce the cracking damage of various hard and brittle materials, but no matter which heating method is used, there are currently two difficult problems to solve: one is that hard and brittle materials are very sensitive to heat. At this stage, it is difficult to achieve precise control of heating energy and heating area; second, as the temperature of the heated workpiece increases, the temperature of the diamond grinding wheel tends to increase due to heat conduction during the cutting process, resulting in a decrease in strength and a shortened tool life. shorten
Patent CN109534690 discloses a method of magnetic toughening to suppress processing damage of hard and brittle materials, but this method needs to immerse the hard and brittle materials in a clamping mold filled with magnetorheological fluid. During processing, a controllable magnetic field is applied to make the magnetic The rheological fluid penetrates into the pores, cracks and other defects on the surface of hard and brittle materials, and the magnetorheological fluid solidifies inside the defects on the surface of hard and brittle materials to form a sealing and toughening mechanism, which is difficult and expensive to operate

Method used

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  • A method for suppressing cracking damage in grinding of hard and brittle materials by surface toughening
  • A method for suppressing cracking damage in grinding of hard and brittle materials by surface toughening
  • A method for suppressing cracking damage in grinding of hard and brittle materials by surface toughening

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Using phenolic resin as toughening agent solute and absolute ethanol as solvent to Si 3 N 4 Real-time toughening of the surface layer during ceramic grinding. Si 3 N 4 Ceramics have the advantages of high temperature resistance, corrosion resistance, wear resistance, light density, small thermal expansion coefficient, etc., but due to their high brittleness, they are prone to cracking damage during grinding. Adopt the method of the present invention to Si in the grinding process here 3 N 4 Ceramics are toughened in real time to verify the feasibility of this method. Follow the steps below to implement:

[0057] 1) Use phenolic resin as the solute of the toughening agent, absolute ethanol as the solvent, and prepare the toughening agent according to the volume ratio of the solute to the solvent of 1:6.

[0058] 2) Reaction sintered Si with a size of 80×40×10mm 3 N 4 The ceramic block was fixed on a surface grinding machine, and the toughening agent was coated on...

Embodiment 2

[0065] Using epoxy resin and dioctyl phthalate as toughening agent solute, absolute ethanol as solvent to Si 3 N 4 Real-time toughening of the surface layer during ceramic grinding. Follow the steps below to implement:

[0066] 1) Take epoxy resin and dioctyl phthalate as the toughening agent solute, and dehydrated alcohol as the solvent, prepare the toughening agent according to the volume ratio of solute and solvent 1:8, wherein, epoxy resin and phthalate The mass ratio of dioctyl formate is 1:2.

[0067] 2) Reaction sintered Si with a size of 80×40×10mm 3 N 4 The ceramic block was fixed on a surface grinding machine, and the toughening agent was coated on the edge of the grinding surface of 80 × 10 mm.

[0068] 3) Set the grinding wheel speed of the grinding machine to 2000r / min, the feeding speed to 6m / min, and the grinding depth to a p = 0.02mm. The size of the diamond grinding wheel used is 200×6-20×Φ31.75mm, and the diamond particle size is 80 # .

[0069] 4) G...

Embodiment 3

[0074] Using vinyl resin, carboxyl-terminated nitrile rubber as toughening agent solute, and absolute ethanol as solvent to Si 3 N 4 Real-time toughening of the surface layer during ceramic grinding. Follow the steps below to implement:

[0075] 1) Take vinyl resin as toughening agent, carboxyl-terminated nitrile rubber as toughening agent solute, absolute ethanol as solvent, prepare toughening agent according to the volume ratio of solute and solvent 1:5, wherein, vinyl resin and carboxyl-terminated butyl The mass ratio of nitrile rubber is 1:1.5.

[0076] 2) Reaction sintered Si with a size of 80×40×10mm 3 N 4 The ceramic block was fixed on a surface grinding machine, and the toughening agent was coated on the edge of the grinding surface of 80 × 10 mm.

[0077] 3) Set the grinding wheel speed of the grinder to 2000r / min, the feeding speed to 5m / min, and the grinding depth to a p = 0.02mm. The size of the diamond grinding wheel used is 200×6-20×Φ31.75mm, and the diamo...

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Abstract

The invention belongs to the field of grinding hard and brittle materials, and relates to a surface layer toughening method for inhibiting crack damage during grinding hard and brittle materials. Themethod comprises the following steps of preparing a toughening agent according to a certain proportion so that the prepared toughening agent can have the characteristics of high permeability, good wettability and fast curing; uniformly coating the edge of the surface of a ceramic to be processed with the prepared toughening agent; grinding the ceramic, and coating the edge of the surface of the ceramic with the toughening agent while grinding; and removing the infiltrated toughening agent on the edge of the surface of the ceramic with ultrasonic after grinding. After the toughening agent is applied according to the surface layer toughening method for inhibiting crack damage during grinding the hard and brittle materials, the degree of crack damage on the edges of the hard and brittle materials can be reduced, the overall processing quality of the hard and brittle materials can be improved and the processing cost can be reduced, so that the practical application of the hard and brittlematerials is further promoted.

Description

technical field [0001] The invention relates to the field of grinding processing of hard and brittle materials, in particular to a method for suppressing cracking damage in grinding processing of hard and brittle materials by adopting surface toughening. Background technique [0002] Hard and brittle materials are increasingly favored by engineers and technicians due to their excellent performance, but their high hardness and high brittleness also bring great difficulties to their machining, which has become a constraint for their use in aviation, aerospace, automobiles, military and other fields. Bottleneck for wide application. At present, 80% of the processing technology of hard and brittle materials uses diamond tools for grinding. Grinding is a processing method that uses abrasives to perform limited damage to the processed workpiece. While obtaining dimensional accuracy, shape accuracy and surface roughness, it will also cause damage to the processed surface of the wo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24B1/00
CPCB24B1/00
Inventor 唐修检刘谦谭俊王帆吴志远杜军王龙杨理钧孟凡卓
Owner ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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