摘要
为了搞清圆锯片锯切工作时的受热变形情况和热变形与圆锯片适张的关系 ,该文测量了过度适张、不开径向槽薄圆盘的受热变形情况 .在一定的转速下 ,对圆盘的外边缘模拟加热 ,通过实验研究圆盘发生热变形的机理和变形过程 .实验结果表明 :①模拟切削加工过程对圆盘的外边缘加热 ,开始阶段 ,盘的变形很小 ,维持原有的碟形状态 ,随着温度差的不断增大 ,圆盘内产生了热应力 ,当温度差达到 16℃以后 ,圆盘开始从碟形逐渐向平面转变 .②圆盘变成平面状态后 ,仍处于临界不稳定状态 ,随着温度差的继续增大 ,圆盘逐渐回复到初始的碟形状态 .③圆盘回复到初始的碟形状态之后 ,圆盘不能蓄积更多的热应力 ,发生热应力释放 .④热压曲发生后 ,温度差继续增加 ,热压曲的变形量增加不大或几乎不增加 .⑤在温度差较小时 ,适张造成的碟形变形不能变成平面状态 ,可以认为是圆盘内的残余应力或适张应力对圆盘外缘的拉紧作用抵抗着热应力 。
The over-tensioned thin circular plate without slits at the edge was measured in order to study the thermal deflection mechanism and the process of the circular saws when it rotated and was heated. The results were as follows: (1) the deflection of the circular plate was smaller and kept the dishing shape at the beginning when the circular plate was heated simulating the cutting process at the edge. The thermal stress increased and the circular plate gradually turned to plane from the dishing shape with the increase of temperature difference; (2) the circular plate remained in the critical instability although it was in the plane status. Then the circular plate gradually reverted to the dishing shape with the continuous increase of temperature difference; (3) the thermal stress released when the circular plate gradually reverted to the dishing shape; (4) the thermal deflection increased little or kept invariable with the continuous increase of temperature difference after the thermal buckle has occurred; (5) the dishing deflection could not shift to plane when the temperature difference was insufficient, because the tension stresses counteract to the thermal stresses.
出处
《北京林业大学学报》
EI
CAS
CSCD
北大核心
2004年第1期74-78,共5页
Journal of Beijing Forestry University
基金
日本AIEJ项目资助
关键词
圆盘
热变形
温度差
固有频率
Cutting
Deflection (structures)
Natural frequencies
Saws
Temperature distribution
Thermal stress
