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如图1所示的薄壁盖压铸件中,需要加工M30×1.5的螺纹和端面,由于φ350的外圆盖壁较薄,在车床上,无论是用卡爪夹φ350外圆还是夹内圆,都容易发生变形,对产品的质量造成一定的影响,对此,我们设计了如图2所示的夹具结构形式,很方便于加工M30×1.5的螺纹和端面。 图2所示的弹性胀心夹具以零件已加工的孔φ18H7和基准面A定位,靠弹性夹头2的胀开来夹紧零件,以避免车削M30×1.5的螺纹及端面时零件旋转。由于该零件不能采用常用的靠外锥面推进来夹紧,因而我们的设计是靠弹性胀心内锥面推进来夹紧,使用后,效果良好,能满足产品设计的要求。图2中本体1与车床主轴相连成一体,弹性夹头2的外圆铣有六条轴向键槽,与定位块5的键槽用键配合连接,
As shown in Figure 1 thin-walled die-castings, you need to M30 × 1.5 thread and the end face, the outer wall of φ350 thin wall, in the lathe, whether it is with the claw clamp φ350 cylindrical or clip the inner circle , Are prone to deformation, the quality of the product have a certain impact, this, we designed the fixture shown in Figure 2 structure, it is easy to process M30 × 1.5 threads and end face. Figure 2 shows the elastic centering fixture with machined hole φ18H7 parts and reference plane A positioning, by expanding the elastic chuck 2 to clamp the parts, in order to avoid turning M30 × 1.5 thread and the end face rotation of the parts. As the part can not be used to push by the outer cone to clamp, so our design is based on elastic expansion of the heart cone push to clamp, after use, the effect is good, to meet the requirements of product design. In Figure 2, the body 1 is connected with a lathe spindle. The outer periphery of the elastic collet 2 has six axial keyways, which are keyed to the keyways of the positioning block 5,