Investigation of thread tapping load characteristics through mechanistics modeling and experimentation
Investigation of thread tapping load characteristics through mechanistics modeling and experimentation
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DOI：
10.1016/s0890-6955(02)00108-6
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发表时间：
2002-11
影响因子：
14
通讯作者：
Tengyun Cao;J. Sutherland
中科院分区：
文献类型：
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作者：
Tengyun Cao;J. Sutherland
建立了攻丝扭矩和轴向力的预测模型。该模型能够预测攻丝扭矩和轴向力所造成的切屑形成和刀具后刀面/工件摩擦在各种加工条件下，包括干攻丝和攻丝与不同的切削液。对攻丝扭矩和轴向力的测量进行了广泛的测试，以验证预测模型。研究了实测攻丝载荷的特性。结果表明，攻丝总载荷由基本载荷和排屑载荷组成。基本载荷由切屑形成和刀具/工件摩擦产生。预测的攻丝载荷与实测的基本载荷吻合较好。切屑填充负载是切屑堵塞在凹槽中的结果，并且本质上是随机的。根据丝锥的几何形状和加工条件，排屑载荷可能是基本载荷的许多倍。也报道了造成严重的切屑堵塞和过大的扭矩导致丝锥断裂的因素。
A mechanistic model for the prediction of tapping torque and axial force is developed. The model is capable of predicting tapping torque and axial force resulting from chip formation and tool flank/workpiece friction under various machining conditions, including dry tapping and tapping with different cutting fluids. Extensive tests on tapping torque and axial force measurements are conducted to verify the predictive model. Characteristics of the measured tapping loads are studied. It is found that the total tapping load consists of a base load and a chip packing load. The base load results from chip formation and tool/workpiece friction. The predicted tapping load is found to be in good agreement with measured base load. The chip packing load is the result of chip clogging in the flutes, and is random in nature. The chip packing load may be many times that of the base load, depending on tap geometries and the machining conditions. Factors causing severe chip clogging and excessive torque leading to tap breakage are also reported.