RU1797521C - Cutter with mechanically fastened cutting plate - Google Patents

Abstract

Usage: in metalworking. The cutter contains a holder 1, in the hole of which there is a rod 8, which tapered end enters the hole of the screw 6. When the cutter is working, the cutting forces act through the cutting plate 3, rod 8, screw 6 on the grip 5, providing an additional clamping of the plates 3. 1 h. P. f-ly. 1 ill.

Description

The invention relates to metalworking and can be used in engineering and instrumentation technology.

Known cutters with mechanical fastening of cutting inserts by tacking (Turning cutters for turning with mechanical fastening of multi-faceted carbide inserts. Designs and dimensions of GOST 20872-80. USSR State Committee for Standards. M: Publishing House of Standards. M: Publishing House of Standards, 1981), consisting of a holder, a stick , screw, cutting and support plates.

The disadvantage is the necessity of using inserts with a front surface of complex configuration, a small number of regrindings, and low reliability of fastening of the inserts at high cutting forces, which is the case with most alloys.

The prototype is a pre-cutter (1) containing a holder, in the socket of which a cutting insert is attached by gripping with a fixing screw.

The disadvantage is the low reliability of the fastening of the plates, especially with high cutting forces and, as a consequence, poor-quality machining of parts; the disadvantage is the difficulty of installation and stepwise regulation of the extension of the tip of the insert.

The aim of the invention is to increase the reliability of the fastening of the plates and stepless control of the protrusion of the tip of the cutter.

This goal is achieved by the fact that in the cutter with mechanical fastening of the cutting insert there is a holder, a grip, a cutting insert, a screw, in which there is a hole at an angle or, and a groove is made in the holder, in which there is a rod located at an angle у, relative to the screw interacting with a screw transmitting force from the cutting insert to the grip and the pressure plate clamping the cutting plate, moreover, the work of the interacting pair, screw and rod is determined by the dependence у-, where a is the angle at which the opening is located s formed in the cylindrical shank of the screw, while the - angle, under which is located relative to the screw rod made with a cylindrical shaft and a hole in it.

The drawing shows a cutter in a section, a General view.

The cutter with mechanical fastening of the cutting insert contains a holder 1, inserts: supporting 2 and cutting 3, clamping 4, clamp 5, pressed by screw 6 with nut 7, rod 8 with pusher 9. Angle y depends on the design of the cutter, and angle a is chosen from the condition y - a 7 °.

The cutter works as follows. When the grip 5 is loosened by nut 7, the cutting insert is mounted with the required accuracy of the position of the cutting edge of the insert 3 relative to the cutter, the insert 3 is moved with the rod 8, which is pressed by the pusher 9. When screwing 5 the nut 7, the clamp 5 is pressed through the insert 4 of the insert 3 to the base plate 2.

When parts are machined, large cutting forces arise. Under the action of 0 these forces, the cutting insert 3 acts through the rod 8, screw 6 on the grip 5, thereby providing an additional clamp on the cutting insert.

Using the proposed cutter with mechanical fastening of the cutting insert is provided:

Improving the reliability of fastening the inserts due to the fact that the invention uses feedback from the cutting insert to the grip through the stem with a screw.

5

0

During processing, the cutting forces act on the cutting insert, which acts through the rod on the clamping screw, which further clamps itself. Than

5, the greater the cutting force, the stronger the self-locking plate.

In the prototype, with an increase in cutting forces due to the elasticity of the fastening elements and the absence of additional clamping of the inserts, vibrations and displacement of the insert occur, which leads to chipping and breakage.

Stepless adjustment of the tip screw due to the fact that the stem has

5, it is now possible to move along the hole of the screw and to brake in a predetermined position by the screw under the condition: y - and 7 °. Steplessness makes it possible to set the tip of the cutter

0 by the desired value, and this leads to an increase in the number of regrinding of the cutting edges of the cutter plate, because the greater the number of regrinds, the longer the plate lasts; with stepless regulation of the face 5

it is sharpened by the amount of wear on the plate, which leads to material savings (and in the prototype, by the size of the step, i.e. excess material was removed).

Claims (2)

SUMMARY OF THE INVENTION 1. A cutter with mechanical fastening of a cutting insert, comprising a holder with a cutting insert secured by a grip with a screw, characterized in that. in order to increase the reliability of plate fastening and steplessly regulating the protrusion of the tip of the cutter, a hole is made in the screw at an angle relative to the end of the screw, and a groove is made in the holder at an angle with respect to the plane of the holder, with a rod inserted partially into the screw hole and a groove of the holder, one end of which is designed to engage with the cutting insert. 2. The cutter according to claim 1, characterized in that the end of the rod, designed to interact with the wall of the screw hole, is placed in it under the condition of its self-braking, which is determined from the inequality J - a 7, where a is the angle at which hole in the screw, j is the angle at which the groove in the holder is made.