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在有固定下死点的锻压设备上进行闭式模锻时,由于棒料毛坯直径的偏差,下料长度的偏差,以及毛坯在炉中加热时氧化烧损的程度不同,料温的不同等原因,会造成毛坯体积的不同。当体积过小时,会使锻件充不满;过大时,会使设备超负荷,锻件产生大的毛刺,严重时会造成设备的闷车,甚至损坏。平锻机一般不配切边压床,故其终锻型槽多为封闭式的。在毛坯体积过大时,由于多余材料无处容纳,本身又不能压缩,这样即使锻件尺寸在平锻机的规格范围内,且计算的镦锻力也在设备允许范围之内,同样也
In the fixed bottom dead forging equipment for closed die forging, due to the deviation of the bar stock diameter, the deviation of the length of the blanking, as well as the degree of oxidation of the blanks heated in the furnace, the difference in temperature, material temperature, etc. The reason, will result in the different volume of rough. When the volume is too small, it will make the forging full of dissatisfaction; too large, it will overload the equipment, forging produce large burrs, serious equipment will cause boring, or even damage. Flat forging machine is generally not equipped with trimming press, so the final forging groove and more closed. When the blank is oversized, the excess material is nowhere to be contained and can not be compressed by itself, so that even if the forging size is within the specifications of the forging machine and the calculated upsetting force is within the allowable range of the equipment,