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冲床附件——气垫,被广泛应用于冷冲压的退料,既方便、又安全。可是在冷挤庄中应用气垫退料是不常见的,原因是气垫本身除退料作用外,还有压紧的作用。当滑块下行时,首先必须克服气垫的压紧力才能使毛坯进入模腔,当挤压毛坯的变形率较小,工件所需的挤压力小于气垫的压紧力时,毛坯进不了模腔或部分进不了模腔,在模腔外就受到挤压变形。此时挤出工件的尺寸、形状得不到保证,如图1所示(B为正常工件)。在这种情况下,只要将控制气垫压紧力的气压调到零,在某一变形率的情况下,能克服上述缺陷。但是,当毛坯变形力很小的时候,即使
Punch accessories - air cushion, is widely used in cold stamping the back material, both convenient and safe. However, the application of air cushion in the cold squeeze back is not uncommon, because the air cushion itself in addition to the role of back material, there are pressing role. When the slider down, you must first overcome the pressure of the air cushion in order to make rough into the mold cavity, when the deformation of the extrusion blank is small, the extrusion pressure required for the workpiece is less than the pressure of the air cushion, the blank can not enter the mold The cavity or part can not enter the mold cavity, and is pressed and deformed outside the cavity. At this point out of the workpiece size, shape can not be guaranteed, as shown in Figure 1 (B is the normal workpiece). In this case, as long as the air pressure to control the cushion pressure is adjusted to zero, in the case of a certain deformation rate, can overcome the above drawbacks. However, even when the deformation force of the blank is small