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毛坯的质量特殊挤压时,在低温下已开始塑性变形。此时的塑性比普通热挤压温度下的低。在低温下金属变形所需的较高的应力,使裂纹容易出现。因此,必须特别注意高强合金毛坯的致密度、晶粒尺寸和结构的均匀性。对于特殊冷挤压法,发展了一种专门的连续铸造法。为冷挤压小直径精密管材,由变形材料切取毛坯(10)、棒材,线材、或厚壁管切取毛坯。毛坯的热处理影响挤压时的塑性和压力要求,而且还能大大影响挤压制品的性能。为使高温均匀化退火效果更好,对退火后的冷却速度也应该重视。在慢速冷却时,可热
When the quality of rough extrusion, plastic deformation has begun at low temperatures. The plasticity at this time is lower than that of ordinary hot extrusion. The higher stress required to deform the metal at low temperatures causes cracks to easily appear. Therefore, special attention must be paid to the high density alloy blank density, grain size and structural uniformity. For the special cold extrusion method, the development of a special continuous casting method. For cold extrusion of small diameter precision tubing, the blank (10), bar, wire, or thick-walled tubing is cut from the deformed material to cut the blank. The heat treatment of the blank affects the requirements of plasticity and pressure at the time of extrusion, but also greatly affects the properties of the extruded product. In order to make high-temperature homogenization annealing better, the cooling rate after annealing should also be taken seriously. In slow cooling, can be hot