SU1750859A1 - Assembled end cutter - Google Patents

Abstract

Usage: in metalworking, in particular when designing face mills. The cutter body is made of upper and lower flanges covering each other in the center. The inner flange ends have annular grooves for free interaction with the projections on the ends of the sector holders. The sector holders have through oval grooves in which are placed the crackers with through holes and elastic elements. Sector holders fixed between the flanges by cylindrical fingers placed in the through holes of the upper and lower flange in th crackers 2 or

Description

The invention relates to metalworking and can be used in the design of end mills.

A known milling cutter comprising a mandrel, a housing and an intermediate disk connected by means of elastic sleeves to the housing. During operation, the moment from the mandrel is transmitted to the intermediate disk and then through the bolts to the elastic bushings and the housing. The shock loads arising in the milling process are partially extinguished by elastic bushes.

The disadvantage of this design is the low level of reduction of dynamic loads due to the fact that all the cutters are rigidly connected to the massive case.

Closest to the present invention is an end mill, comprising a body, a mandrel, sectors with incisors, and elastic bushings located in sectors. During the milling process, the resulting shock loads are partly extinguished by elastic bushings, as elastic-damping elements.

The disadvantage of the known cutter design is the change in the angles of the cutting element due to the rotation of the sectors with holders relative to the support fingers eccentrically displaced with respect to the axis of rotation of the cutter. As a result, the machining conditions deteriorate due to the change in the outer diameter of the cutter and the dynamic loads are not highly effective.

The aim of the invention is to reduce the level of dynamic loads with high quality processing.

The goal is achieved by the fact that the body is made in the form of two coaxial flanges with hubs and at the same time mating with their central holes with the lower cylindrical end of the mandrel and the inner ends of the flanges near the hubs are provided with ring grooves free-cutting protrusions at the ends of the hubs of sector holders having through oval grooves in which crackers are mounted with through holes in which cylindrical fingers extend simultaneously entering the holes of the upper and lower flanges and into you scolded

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oval grooves are installed elastic-damping elements

Figure 1 shows the proposed mill, axial section; Fig 2 - section aa in Fig.1.

On the milling mandrel 1, a body is installed, made in the form of two coaxial flanges 2 and 3 with hubs partially covering one another and simultaneously matching their central holes with the lower cylindrical end of the mandrel. The inner ends of the flanges near the hubs are provided with annular recesses, respectively, a and b, freely covering the protrusions at the ends of the sector holders 4, equipped with incisors 5. The cylindrical fingers 6 entering the holes of the crackers 7 mounted in the holes of the upper and lower flanges the through oval grooves of the sector holders A and between the sector-oriented relative holders in the circumferential direction and the peripheral part of the flanges 2 and 3 are installed bearing washers 8 and 9, for example, from caprolon.

For clamping the flanges 2 and 3 of the cutter and adjusting its stiffness, the screw 10 and the spring 10 are designed. A key 12 holds the cutter body from circumferential displacements relative to the mandrel 1.

In addition, elastic-damping elements 13 are in the through oval grooves of the sector holders 13. in contact with the croutons 7.

Tortsova mill works as follows.

When the spindle of the machine with the blade 1 is rotated and the incisors interact with the workpiece, the torque is transmitted through the cylindrical fingers 6 passing through the holes of the breadcrumbs 7 to the sector holders with the cutters 5. When the incisors 5 penetrate into the workpiece, the angular speed of the incision lags behind on the speed of rotation of the spindle due to the elastic connection of the cutter body with the sector holders through the elements 13. made of an elastically damping material

Since the torque on each of the sector holders is transmitted through its elastic damping elements 13, the level of dynamic loads transmitted through the mandrel 1 to the spindle of the milling machine is reduced. Since, during machining, the cutter geometry and outer diameter of the cutter remain unchanged, the result is high quality of processing.

The economic efficiency of using the milling cutter is to increase the durability of the work of both the milling cutter and its rotation drive, as well as to reduce the noise level, i.e., to improve the working conditions of the machine operators.

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A collective end milling cutter comprising a body with sector holders with cutters and elastic elements, as well as cylindrical fingers arranged therein, characterized in that, in order to improve the quality of processing by reducing the level of dynamic loads, the milling cutter is provided with dryers with through holes and the casing is made of upper and lower flanges, covering each other in the center, with the annular recesses at the inner ends of both flanges at the same distance from the center, and round holes - through holes, while on the sector holders there are through oval grooves for accommodating the mentioned crackers and elastic elements, and on the ends - protrusions designed to freely interact with the walls of the annular recesses of the upper and lower flanges, with cylindrical fingers placed in the through openings of the top and bottom flanges, and also crackers. Jv Fig, 1 2