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在机械加工中,自动定心夹具因能夹持不同直径的工件,并能自动定心,节省校正时间而得到普遍的应用。如机床上使用的三爪卡盘。但是由于其结构特点,在使用上还受到一定的限制。下面介绍一种夹具—自动定心钳,操作方便,定心准确,效果理想。1.结构自动定心钳主要由双向螺杆、夹具体、偏心机构、后夹紧块和前夹紧块等组成(见图1)。后夹紧块(见图2)和前夹紧块(见图3)中分别固定有一个旋向相反的螺母。把双向螺杆与夹紧块相配合形成一个夹紧部件,该部件放置在具有两个45°斜面的夹具体上。夹具体(见图4)中间空腔处安装一偏心压紧机构,偏心压紧机构的轴通过夹具体空腔两壁的孔伸出夹具体,其两端各固定一侧板(见图5),侧板上的45°台肩压在前、后夹紧块的45°台肩上,使整个夹具连为一体。该夹具巧妙地把螺机构、偏心机构、斜面机构融为一体,结构独具一格。
In machining, the self-centering jig can be used universally because it can hold different diameter workpieces and can automatically center and save the correction time. Such as the machine used on the three-jaw chuck. However, due to its structural features, it is also limited in its use. The following describes a fixture - automatic centering forceps, easy operation, centering accuracy, the effect is ideal. 1. Structural automatic centering forceps mainly by two-way screw, clamp body, eccentric institutions, after the clamping block and the front clamping block and other components (see Figure 1). The rear clamping block (see Figure 2) and the front clamping block (see Figure 3) are respectively fixed with a counter-rotating nut. The two-way screw cooperates with the clamping block to form a clamping part, which is placed on the clamp body with two 45 ° bevels. An eccentric pressing mechanism is arranged at the middle cavity of the clamp body (see Fig. 4). The axis of the eccentric pressing mechanism extends out of the clamp body through the holes of the two walls of the clamp body cavity, ), The 45 ° shoulder on the side plate is pressed against the 45 ° shoulder of the front and rear clamping jaws, so that the entire fixture is integrated. The fixture clever screw mechanism, eccentric mechanism, bevel mechanism integration, unique structure.