SU1151401A1 - Honing head - Google Patents

Abstract

HONING HEAD for electrochemical treatment of holes, containing an electrode housing, in the longitudinal grooves of which holders with honing bars with the possibility of their radial movement are placed, and an expanding mechanism with elastic unclamping, including a screw and a screw bushing, which is different in order to expand Technological capabilities, in the expanding mechanism a key is inserted, installed at one end, made with a helix angle of lift - p, in the screw grooves of the screw, with another one, made with a lifting angle MA oij / J - in the screw slots of the sleeve, where / b is the angle of self-locking.

Description

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The invention relates to electrochemical machining and can be used for electrochemical honing, galvanic deposition and simultaneous honing of precise holes. A known honing head for electrochemical machining of holes, comprising an electrode body in longitudinal grooves of which holders with honing bars are placed with the possibility of their-. of the diagonal movement, and an expansion mechanism, including a screw and a screw sleeve CO. However, this honing head is intended only for electrochemical machining, during which the seam allowance is removed and, accordingly, the diameter of the hole is increased. The expansion mechanism does not provide for the possibility of retraction during the machining process, therefore the friction forces arising in the expansion mechanism do not allow to maintain the required specific pressure of the honing stones on the surface being processed. The purpose of the invention is to expand the technological capabilities of the honing head by reducing the forces friction in expanding mechanism. The goal is achieved by the fact that in the honing head for electrochemical machining of holes containing an electrode-housing, in the longitudinal grooves of which holders with honing bars with the possibility of their radial movement are placed, and an expanding mechanism with elastic unclamping, including a screw and a screw sleeve, in an expanding mechanism is inserted with a key, mounted by one condom, made with the helix angle of lifting / J, in the screw grooves of the screw, the other, made with the lifting angle ot. : p, - in the screw sleeve pauses, where / 1 is the angle of the self-brake. Completing the elevation angles of the screw lines and the helical bushing with various housings allows the honing beams to reverse in the radial direction using self-locking, moreover, choosing the angle o / maintain this specific pressure within the required limits due to the fact that arising in the expansion mechanism, it occurs in the screw pair. Choosing a certain angle, it is possible to adjust the force on the honing bars within the required limits, since the friction force arising in a pair of hub-key is proportional to the sine of the angle of elevation of the helix of the hub. In addition, during the forward stroke, the force required to communicate the screw rod to obtain the minimum required on the honing bars is significantly reduced, since the frictional force arising in a pair of screw-key is proportional to the cosine of the helix of the screw. FIG. 1 shows a honing head, a general view; FIG. 2 is a section A-A rta of FIG. one; in fig. 3 is a section BB in FIG. 2. The honing head contains an electrode housing 1, in the axial bore of which a screw bushing 2 is placed, the axial movement of which is limited by a retaining ring 3. The bushing is hingedly connected by means of pushers 4 with holders of 5 honing bars entering the longitudinal grooves of the casing with honing fixed on them bars 6 with the possibility of their radial movement. In the axial hole of the screw bushing there is an expanding screw rod 7 interconnected with it by means of a key 8 installed at one end in the screw grooves 9 of the rod with the elevation angle of the helix d-y90 ° - / s, the other in the grooves 10 of the screw sleeve, made with the elevation angle of the helix, in which the elastic element 11 is also placed. The angle /} in this case (material ST.X18H.10T) is 8, then oti782 °,. The device works as follows. In the process of galvanic honing, the rod 7, moving in the axial direction, rotates the key 8 along with the screw sleeve 2 connected with it due to the self-locking mechanism. At the same time, by virtue of the hinge kinematic connection by means of the pushers 4 between the screw sleeve and holders of the 5 honing bars with the bars; and 6 the latter move in the radial direction, creating the minimum necessary pressure on the surface to be treated, the value of which depends on the elasticity of the elastic elements 11.

During processing, due to the elevation angle of the helical bushing, the oL ft rotates around the axis only the bushing, with minimal frictional forces in the screw pair, allowing honing

The bars move radially from the surface of the workpiece.

In the process of electroplating the electrode-housing, the electrode is the anode, the part-cathode. In the process of electrochemical honing, polarity is reversed.

The application of the proposed honing head can significantly reduce the number of tools through the use of tools both in the process of electrochemical and galvanic honing.

Claims (1)

HONING HEAD for electrochemical machining of holes, comprising an electrode body, in the longitudinal grooves of which are holders with honing bars with the possibility of their radial movement, and an expansion mechanism with elastic expansion, including a screw and a screw sleeve, characterized in that, in order to expand the technological capabilities, the expansion mechanism inserted key, installed with one end formed with a helix angle lifting ⁰ - β, in the helical grooves of the screw, the other formed with an angle of ₂ ° c rise with - a screw sleeve slots where β - the angle of self-locking. SU „1151401