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我厂生产的回转体筒形件(见图1b),热收口前要经过冲压、拔伸、粗车外形等工序。粗车毛坯全长539.5mm,外径为124.4mm(图1a)壁厚8mm。收口前要将收口变形部分金属加热到850～900℃,在400t压力机上收口。为提高收口成形效果,必须涂刷润滑剂,该筒形件用模锻石墨乳,型号为MD-2,润滑方式习惯上是将石墨乳涂刷收口下模的模具表面上(见图2)。该产品在生产中常出现体短,模具寿命只有500～600件,良品率最高达到56.5％。为了找到收口体短的真正原因。我们对
I produced the rotary cylinder body (see Figure 1b), before the heat shut-off to go through stamping, stretching, rough car shape and other processes. Rough rough rough 539.5mm, an outer diameter of 124.4mm (Figure 1a) wall thickness of 8mm. Before closing the mouth should be deformed part of the metal heated to 850 ~ 900 ℃, closed at the 400t press. In order to improve the effect of shut-in forming, a lubricant must be applied. The tubular part is forged with graphite foam, model MD-2, and the lubrication method is to brush the graphite mold on the surface of the mold (see FIG. 2) . The product often appear in the production of short body, mold life is only 500 to 600, the highest yield up to 56.5%. In order to find the real reason why the mouth is short. We