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冲压后的钢球毛坯具有环带与两极。这些多余的金属,按照国内现行的机械加工工艺方法是首先在两块轴承钢制的锉板之间进行锉削加工,使球坯获得球的雏形,并统一冲压后的尺寸公差和纠正其压偏差。此后再在专用磨球机上用砂轮进行磨削,俗称软磨,以磨去其大部分尺寸留量——原材料脱碳层及锉削后的表面金属疲劳层,并同时统一上工序尺寸公差(在0.02毫米以内)、提高几何精度(在0.01毫米以内)和表面质量(达(?)6—7)。再后进行热处理。而大于1″的热冲钢球毛坯则需先进行退火(≥1(7/16)″钢球),后在压力机切除环带、粗锉除去两极,此后进行初磨和软磨加工,再后进行热处理。由上述可见,钢球毛坯从冲压后到热处理工序之间的机械加工过程工艺烦杂,生产周期长,并需设置有中问仓库及付出大量的往返搬运劳动量。
The stamped steel blank has an annulus and two poles. These extra metals, according to the current domestic machining process is the first file between the two bearing steel filing process, so that the ball to obtain the prototype ball and uniform stamping size tolerance and correct its pressure deviation. Since then, grinding on a special ball mill with a grinding wheel, commonly known as soft grinding, to wear away most of its dimensions - the decarburized layer of raw materials and the surface metal fatigue layer after filing, and at the same time the uniform dimensional tolerances 0.02 mm), improve geometric accuracy (within 0.01 mm) and surface quality (up to? 6-7). Then heat treatment. For hot-rolled ball blanks larger than 1 “, annealing (≥1 (7/16)” ball) should be carried out first, and then the ring is cut off with a press and the poles are removed with a rasp, followed by initial and soft grinding After heat treatment. From the above, it can be seen that the rough machining of the steel ball blank from the stamping to the heat treatment process is complicated and the production cycle is long, and a warehouse for asking questions and a large amount of round-trip labor are required to be provided.