A kind of turning processing method of silicon carbide whisker reinforced aluminum matrix composite material

A technology of silicon carbide whiskers and reinforced aluminum base is applied in the field of composite material turning processing, which can solve the problems that the surface roughness of the workpiece has a great influence, the service performance of the components has a great influence, and the tool wear is relatively serious, so as to reduce the machined surface. The effect of roughness, reducing residual stress in cutting, and improving service performance

Active Publication Date: 2021-07-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processing characteristics of SiCw / Al composite materials are similar to those of aluminum alloys. However, first of all, because SiCw / Al composite materials contain SiC whiskers with high hardness, the wear of the tool is relatively serious; secondly, because the material matrix is ​​aluminum alloy, the cutting process The scales that may be produced in the process have a great influence on the surface roughness of the workpiece; at the same time, after plastic processing such as extrusion and forging, the length direction of the whiskers is arranged along the flow direction of the base aluminum alloy, showing a directional arrangement, and the SiC whiskers are in the The orientation in the matrix alloy also has a great influence on the machinability of the composite material, and the turning process of SiCw / Al composite materials with different whisker orientations is still lacking; finally, the residual stress generated on the cutting surface has a great influence on the service performance of the component. Low residual stress cutting process is still a problem to be solved

Method used

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  • A kind of turning processing method of silicon carbide whisker reinforced aluminum matrix composite material
  • A kind of turning processing method of silicon carbide whisker reinforced aluminum matrix composite material
  • A kind of turning processing method of silicon carbide whisker reinforced aluminum matrix composite material

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preparation example Construction

[0014] Preparation of SiC-reinforced aluminum-matrix composite rods: SiCw / Al aluminum-matrix composites were manufactured by extrusion casting, and the reinforcement was TWS-100β-SiC whiskers produced by Tokai Carbon Co., Ltd., Japan. The whisker volume fraction was 15-30%, the matrix is ​​pure aluminum, 2024, 6061, 7075 and other aluminum alloys. The as-cast SiCw / Al composite material is hot-extruded at 500°C, and the extrusion ratio is greater than 12:1 to obtain a hot-extruded rod, and the whiskers are oriented along the direction of the rod axis.

[0015] The SiCw / Al aluminum-based composite material with a volume fraction of whiskers of 20% is used for the examples that the whiskers are chaotically distributed, the whiskers are perpendicular to the axis of the rod to be processed, and the whiskers are parallel to the axis of the rod to be processed. .

Embodiment

[0017] High-precision turning of silicon carbide whisker-reinforced aluminum matrix composites according to the following parameters:

[0018] Tool selection: use single crystal diamond turning tool or polycrystalline diamond blade, tool rake angle γ0=0-5°, back angle α0=5-8°, main declination angle Kr=45-75°, secondary declination angle Kr'= 10-15°, the blade inclination angle λs=0°, the radius of the arc of the tool nose r=0.3-0.5mm. Before turning, the diamond inserts are assembled on matching toolholders.

[0019] Select coolant: add kerosene as lubrication and coolant to reduce the formation of scales and reduce the roughness of the machined surface.

[0020] The outer surface of SiCw / Al composite bar is processed by numerical control lathe. Feed speed Vf=5-40mm / min, cutting depth ap=10-50μm, cutting speed V=10-60m / min.

[0021] figure 1 is a schematic diagram of the turning process of SiCw / Al composites with three different whisker orientations, where the volume frac...

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Abstract

The invention discloses a turning processing method of silicon carbide whisker-reinforced aluminum-based composite materials, and relates to a turning processing method of composite materials. The invention adopts a single crystal diamond turning tool or a polycrystalline diamond blade. Before turning, the corresponding diamond blade is assembled on the On matching tool holders; turning silicon carbide whisker reinforced aluminum matrix composites under the action of lubricating fluid and coolant. The invention uses kerosene as lubricating and cooling fluid to reduce the formation of scales and reduce the roughness of the machined surface. Through the combination of specific parameters, the cutting residual stress is reduced and the service performance of components is improved.

Description

technical field [0001] The invention relates to a turning processing method of a composite material, in particular to a high-precision turning processing method of a silicon carbide whisker-reinforced aluminum-based composite material. Background technique [0002] Silicon carbide whisker reinforced aluminum matrix composite (SiCw / Al) composite material is a high-performance discontinuous reinforced metal matrix composite material, in which silicon carbide whiskers have a diameter of 0.1-1 microns and a length of tens to hundreds of microns. It is characterized by high specific strength and specific stiffness, heat resistance, wear resistance, and small thermal expansion coefficient, so it has a very wide application prospect in the fields of aerospace, mechatronics, and military equipment. [0003] Machining is an important part of SiCw / Al composite material processing technology. The processing characteristics of SiCw / Al composite materials are similar to those of aluminu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23B1/00
CPCB23B1/00
Inventor 耿林张学习
Owner HARBIN INST OF TECH
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