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采用专门设计的凸轮式形变试验机,用压缩端面带凹槽并在凹槽里充满不同熔点温度的玻璃粉作润滑剂的圆柱形试件.为保证试验过程中整个试件温度的均匀和衡定,采用了试件保温装置.实验研究了十个钢种在高温高速下的变形阻力.试验范围:1) 变形温度850～1200℃;2) 变形速度5～40秒~(-1);3) 变形程度?最大为68%.通过对实验数据的回归分析——线性和非线性回归,对三种形式的变形阻力公式进行了分析讨论,并着重分析了变形程度对变形阻力的影响规律.认为用ε~n来表示变形程度对变形阻力的影响在较小和较大变形程度时误差较大.提出了用多项式来表示变形程度的影响.文章推荐了在计算机控制的设定模型以及工程计算中可优先采用的变形阻力的计算公式.
Specially designed cam-type deformation testing machine, with a compression end face grooved and filled in the groove with different melting point temperature of the glass powder as a lubricant cylindrical specimen.In order to ensure that the entire test specimen temperature uniformity and balance Deformation resistance of the ten kinds of steel at high temperature and high speed was experimentally studied. The test range was: 1) the deformation temperature was 850-1200 ℃; 2) the deformation speed was 5-40 seconds -1; 3) The deformation degree is up to 68% .Three kinds of deformation resistance formulas are analyzed and discussed through regression analysis of experimental data - linear and nonlinear regression, and the influence laws of deformation degree on deformation resistance are analyzed emphatically It is considered that using ε ~ n to denote the effect of deformation degree on the deformation resistance is larger with smaller and larger deformation degree.Multiple polynomial is used to express the effect of deformation degree.The article recommends the computer-controlled setting model and Engineering calculation can give priority to the deformation resistance calculation formula.