Investigation on broaching performance and unloading mechanism of micro-textured broach
Investigation on broaching performance and unloading mechanism of micro-textured broach
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微织构拉刀拉削性能及卸荷机构研究
DOI：
10.1007/s00170-016-8388-8
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发表时间：
2016
影响因子：
3.4
通讯作者：
xu jing
中科院分区：
文献类型：
--
作者：
ni jing;li bin;xu jing
设计了一种表面纹理化的拉刀，以减缓拉刀表面磨损并增加寿命。采用激光加工技术在键槽拉刀后刀面生成倒三角形表面纹理。对45#钢进行拉削载荷试验。采用有限元分析方法，建立了拉削力模型，获得了拉削过程中的内应力分布，分析了毛化拉刀的减磨机理。研究表明，微织构拉刀可使拉削力降低约5%，提高拉刀对拉削载荷的响应性能。织构槽能有效地卸载主作用区的集中应力，防止应力突变引起的疲劳变形破坏，但对前刀面边界无影响。挤压变形过程中织构对拉削的影响大于断裂分层过程。由于倒三角织构良好的耐磨性，织构化拉刀可以减少刀具磨损，显著提高切削效率和拉削性能，提高使用寿命。
A surface textured broach was designed to slow the broach surface wear and increase the lifespan. Laser processing technology was used to generate inverted triangle surface texture on the flank of key way broach. Broaching 45# steel load test was carried out. Using a finite element analysis method, a broaching force model was developed to obtain the internal stress distribution and to analyze the anti-wear unloading mechanism of textured broach. Investigation shows that micro-textured broach can approximately reduce the broaching force by 5 % and improve the response performance of broach for broaching load. The texture slot can effectively unload the concentrated stress of the main function area and prevent fatigue deformation failure by suddenly change of stress, but it has no effect on the rake face boundary. The texture has a greater impact for broaching in the process of extrusion deformation than the process of fracture layered. The textured broach can reduce the tool wear due to the nice wear resistance of inverted triangle texture, significantly improves the cutting efficiency and broaching performance and increase lifespan.