SU1688993A1 - Slotted mandrel - Google Patents

Abstract

The invention relates to metal working and can be used to secure the blanks. The purpose of the invention is to improve the fixing accuracy by increasing the securing forces. In the grooves of the spline roller 1, the cams 2 are installed with the possibility of longitudinal movement. The bottom of the grooves of the roller 1 are parallel to the axis of the mandrel, and their side surfaces are angled to the axis of the mandrel. The lateral working surface of each cam 2 is made in steps, the upper part of which is made in the form of a longitudinal section at an angle equal to the angle of inclination of the mandrel to its axis forming a surface parallel to the axis of the mandrel, and the lower part corresponds to the profile of the grooves of the roller 1. On the threaded part of the roller 1 is installed the nut 3, and on the opposite side between the bead of the roller 1 and the cams 2, a return spring 4 is installed. After installing the workpiece 5 on the mandrel, rotating the nut 3 move the cams 2 and fix the workpiece 5. 3 sludge.

Description

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The invention relates to the field of metalworking and can be used to secure the blanks.

The aim of the invention is to improve the fixing accuracy by increasing the securing forces.

Figure 1 shows the slotted mandrel, section; FIG. 2 is a section A-A in FIG. on fig.Z - view B in figure 1.

The slotted mandrel consists of a slotted roller 1, in which grooves are made through the longitudinal direction, the bottom and parallel to the axis 0-0 of the mandrel, and the side surfaces b are angled a to the axis O-O of the mandrel. In the grooves of the roller 1 are arranged with the possibility of longitudinal movement of the cams 2, the lateral working surface of each lz of which is stepped, the upper part of which is made in the form of a longitudinal section with an angle equal to the angle of inclination of the grooves of the mandrel to its axis, and the lower part corresponds to the slot profile roller 1.

The movement of the cams 2 is performed by means of a nut 3 mounted on the threaded surface of the roller 1, and on the opposite side between the shoulder of the roller 1 and the cams 2 a return spring 4 is installed. The magnitude of the angle a is chosen from design considerations, taking into account the width of the splines, the tolerance field, the length of the spline hole, and t, e. The values of the parameter a are usually 5-10 °.

The mandrel works as follows.

The workpiece 5 is installed on the mandrel until it stops at the end of the step 6 of the roller 1. Further, when tightening the nut 3, it interacts with the ends of the cams 2 by means of the washer 7, moving the latter in the grooves, resulting in lateral working surfaces b of the cams 2 the surfaces of the splines of the workpiece 5, provide accurate centering and simultaneous fixing of the latter on the mandrel. The workpiece is loosened by reverse rotation of the nut 3, and with the help of the spring 4, the workpiece 5 is freely removed from the mandrel.

Claims (1)

Claims of the invention Shlitsev mandrel, made in the form of a splined roller, in the grooves of which the cams are arranged with the side working surface, which means that, in order to improve the accuracy of the base, the grooves are made through, their bottom is parallel to the axis of the mandrel, and the side surfaces are angled to the axis of the mandrel, while the side working surface of each cam is made stepped, the upper stage of which is made at an angle equal to the angle of inclination of the grooves of the mandrel to its axis, and the lower tupen corresponds to the profile grooves of the splined roller. A-l 2 2, Vid Fig.Z