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在连杆衬套强力旋压生产工艺中,需“温挤制坯”对坯料进行先期处理,温挤后材料的损伤直接影响旋压的效果。应用Deform软件对衬套坯料的温挤压进行有限元模拟,随机选取5个节点,得到节点的损伤值随摩擦系数、挤压速度和坯料预热温度的变化规律,并由此得到温挤压后坯料的损伤随参数的变化为:坯料材料的损伤值随摩擦系数的增大而增大,随挤压速度的增大而增大,随坯料预热温度的增大反而减小。设计正交模拟试验,对试验结果进行方差分析得到摩擦系数对坯料损伤的影响最为显著,且当摩擦系数为0.1,挤压速度为1 mm·s-1,预热温度为650℃时,温挤压后坯料的最大损伤值最优,即坯料的损伤最小。
In the strong link spinning rod production process, the need to “warm extrusion billet” pre-treatment of the billet, after warm extrusion material damage directly affects the spinning effect. Deform software was used to simulate the thermal extrusion of bushing blank by finite element method. Five nodes were randomly selected to obtain the change rule of the damage value with the friction coefficient, extrusion speed and preheat temperature of the billet. The damage of the slab changes with the parameters as follows: the damage value of the slab material increases with the increase of the friction coefficient, increases with the increase of the extrusion speed, but decreases with the increase of the preheating temperature of the slab. Orthogonal simulation test was designed. The results of ANOVA showed that the friction coefficient had the most significant effect on the blank damage. When the friction coefficient was 0.1, the extrusion speed was 1 mm · s-1 and the preheating temperature was 650 ℃, The maximum damage value of the extruded billet is optimal, that is, the billet has the least damage.