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Grinding method for forming small-hole thread of hard and brittle material

A technology for forming and grinding hard and brittle materials, used in metal processing equipment, tangent devices, manufacturing tools, etc., can solve the problems of thread surface scratches, low processing efficiency, wear strength, etc., and achieve good thread surface quality and high machining. Efficiency and the effect of ensuring thread machining accuracy

Active Publication Date: 2015-05-20
BEIJING HANGTIAN XINFENG MECHANICAL EQUIP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problems of sharp wear of cemented carbide taps during tapping or breakage due to insufficient strength, resulting in scrapped materials, untimely chip removal and scratches on the thread surface, and low processing efficiency

Method used

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  • Grinding method for forming small-hole thread of hard and brittle material
  • Grinding method for forming small-hole thread of hard and brittle material
  • Grinding method for forming small-hole thread of hard and brittle material

Examples

Experimental program
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Effect test

Embodiment

[0028] Example: M2 small hole thread processing is carried out on the silicon carbide particle-reinforced aluminum matrix composite material, and the processing thread precision is required to be grade 4.

[0029] Diamond or CBN abrasives can be used for disc shaped grinding wheels.

[0030] According to the requirements of the embodiment, it can be seen that the nominal diameter of the M2 internal thread is D=2, and the pitch P=0.4; the actual processing error threshold (four-level accuracy) of the M2 thread is δ o is 0.056mm, put the above value into the formula (1), let the formula (1) take the equal sign, the critical value of the coefficient η [η]=0.23 can be obtained.

[0031] When η≤[η], that is, η≤0.23, d=ηD≤0.46, the disc-shaped forming grinding wheel can meet the processing requirements without modification. When [η]o -Δα, where α o Is the standard thread angle, usually 60 °. Δα is the modification angle of the disc-shaped forming grinding wheel. According to the ...

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Abstract

The invention provides a grinding method for forming a small-hole thread of a hard and brittle material and belongs to the technical field of mechanical machining and tools. The grinding method is characterized in that: by using a plate-shaped forming grinding wheel with special section shape, the small hole thread is formed by using a spiral grinding method in which a cutter shaft is parallel to the center of a hole axis, wherein a workpiece is unmovable and a cutter revolves with an eccentric distance e along the hole axis in the form of a spiral trace at the same time of revolving on its axis. The machining motion is formed by compounding rotation of the plate-shaped forming grinding wheel, revolution of the plate-shaped forming grinding wheel on the hole axis and axial feeding of the plate-shaped forming grinding wheel. As the cutter shaft is parallel to the hole axis, theoretical errors exist, so that the shape of the thread is quite poor due to the interference of the cutter during the machining of the plate-shaped cutter along the spiral trace; therefore, it is required in the method that the plate-shaped forming grinding wheel with special corrected shape is selected. Compared with a method for machining a thread by using a hard alloy or coating screw tap, the grinding method for forming the small-hole thread of the hard and brittle material, provided by the invention, has the advantages as follows: the thread machining accuracy can be guaranteed and higher working efficiency can be also obtained during machining the small-hole threads of hard and brittle material parts.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing and tools, and relates to a small hole thread processing method, in particular to a small hole thread forming grinding method for hard and brittle materials. Background technique [0002] Hard and brittle materials represented by high volume fraction particle-reinforced metal matrix composites, ceramics, quartz, etc. are widely used in the field of modern science and technology due to their good performance. In particular, high volume fraction particle-reinforced metal matrix composites have a series of advantages such as light weight, high modulus, high specific strength, low thermal expansion coefficient, corrosion resistance, and good vibration absorption. Wide range of applications. However, the high specific strength and high specific stiffness of hard and brittle composite materials make it a difficult material to machine, especially it is more difficult to process M2~M5 small...

Claims

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Application Information

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IPC IPC(8): B23G1/32
Inventor 高航鲍子成曹波鲍永杰陈广华杨安强刘景坡
Owner BEIJING HANGTIAN XINFENG MECHANICAL EQUIP
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