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在多品种生产中,能固定范围广的坯件尺寸,是对工艺装备的主要要求之一。胀开心轴也有这样的要求,这可以从结构上采取措施,把心轴调到一定尺寸来达到。图1所示心轴的卡爪由底座2和专用的卡爪3组成,二者相互间用螺纹相联。卡爪外表面上的齿与调整盘4的齿啮合。拉杆1轴向移动时固定坯件,盘4和卡爪3的相应回转便调整心轴,卡爪孔内的螺纹保证它径向移动。在图2所示的液压心轴中,薄壁弹性套6装在轴5上,轴的外表面相对其支承轴颈具有偏心e,轴端部所切的齿与齿盘4啮合。套6内腔充满工作介质,并用系列孔道与本体3的轴向孔道相通,本体内装有包括螺钉2和柱塞1的液压泵,柱塞移动时工作介质产
In many varieties of production, can be fixed a wide range of blank size, is one of the major requirements of the process equipment. Expansion of the mandrel also has such a request, which can take structural measures, the mandrel transferred to a certain size to achieve. The jaw of the mandrel shown in FIG. 1 is composed of a base 2 and a special jaw 3, which are connected with each other by threads. The teeth on the outer surface of the jaw mesh with the teeth of the adjustment plate 4. The rod 1 is fixed axially while moving the blank. The corresponding rotation of the disc 4 and the pawl 3 adjusts the mandrel. The thread in the pawl hole ensures that it moves radially. In the hydraulic mandrel shown in Fig. 2, a thin-walled elastomeric sleeve 6 is mounted on a shaft 5 having an outer surface e with an eccentricity e relative to its support journal and a tooth cut at the shaft end engaging the chainring 4. The inner cavity of the sleeve 6 is filled with the working medium and communicates with the axial hole of the main body 3 through a series of holes. The main body is internally provided with a hydraulic pump which comprises a screw 2 and a plunger 1. When the plunger is moved,