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Method for coarsening surface by erosion of hard grains in high speed

A hard particle and texturing technology, applied in the direction of abrasive feeding device, abrasive, metal processing equipment, etc., can solve the problem of low processing efficiency, achieve good effect, improve strength and hardness, uniform and irregular shape Effect

Inactive Publication Date: 2007-07-25
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But its processing efficiency is not high

Method used

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  • Method for coarsening surface by erosion of hard grains in high speed
  • Method for coarsening surface by erosion of hard grains in high speed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The selected hard particles are alumina ceramics (α-Al 2 o 3), the particle diameter is: 10-20μm, and the substrate is Cr5 steel plate. The high pressure compressed gas is air. Texturing process: gas pressure 1.0MPa, gas flow rate 20g / s, powder feeding density 100 pieces / mm 2 , The distance between the nozzle and the workpiece surface is 25mm. The textured surface morphology is shown in Figure 2. It can be seen that the surface morphology of the material after texturing technology is characterized by: uniform and irregular morphology, roughness (Ra) value of 0.1 μm-1 μm, large Pc value, Ra and Pc The value correlation is not strong, and there are interconnected channels between the bumps or pits.

Embodiment 2

[0036] The selected hard particle material is glass powder, the diameter of the particles is 20-30 μm, and the matrix is ​​GCr15 roller. The high-pressure compressed gas is a mixture of nitrogen and helium. Texturing process: gas pressure 2.5MPa, gas flow 30g / s. The textured appearance of the forming roller surface is shown in Figure 3. It can be seen that the surface appearance of the material after the texturing technology is characterized by uniform and irregular appearance, the roughness (Ra) value is 1 μm-2 μm, and the correlation between Ra and Pc values ​​is not significant. Strong, there are interconnected channels between the protrusions or pits.

Embodiment 3

[0038] The selected hard particles are cemented carbide, NiCrCo alloy, and the diameter of the particles is 30-60 μm. The substrate is a leveling roll. The high-pressure compressed gas is a mixture of nitrogen and helium. Texturing parameters: gas pressure 3.5MPa. The flow rate is 35g / s, and the textured appearance of the formed roller surface is shown in Figure 4. It can be seen that the surface appearance of the material after the texturing technology is characterized by: uniform and irregular appearance, and a roughness (Ra) value of 3 μm-5 μm; Ra and The correlation of Pc value is not strong; there are interconnected channels between the protrusions or pits.

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Abstract

A high-speed hard particle collision method for roughening the surface of workpiece features that the superfine hard particles are driven by the compressed air to impact on the surface of workpiece at sonic or supersonic speed to make said surface to be strongly and plastically deformed while the fine metallic particles to be separated from the surface, so roughening it.

Description

(1) Technical field [0001] The invention relates to a metal material surface processing technology, in particular to a material surface roughening treatment technology. (2) Background technology [0002] Cold-rolled steel sheets with special surface topography are widely used in manufacturing, especially in the automotive and home appliance industries. Textured cold-rolled thin steel sheets are rolled by roughened rolls, and a series of surface morphology features have a great influence on the deep drawing, coating and other process properties of the steel sheet. The added value of textured cold-rolled steel sheets is extremely high, but the lag of production means and technology hinders the mass production of textured steel sheets. Therefore, exploring and developing a practical and advanced roll surface roughening technology has become an urgent need for the current cold-rolled sheet production plants. [0003] Roll texturing technology can be divided into three categori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24C1/04B24C11/00B24C7/00
Inventor 张俊宝宋洪伟史弼
Owner BAOSHAN IRON & STEEL CO LTD
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