SU1127690A1 - Method of rotary turning - Google Patents

Abstract

METHOD OF ROTARY TURNING, according to which the rotary cutter and two simultaneously machined parts are given rotational motions around their axes, and the details m - feed movement, characterized in that, in order to improve the quality of processing by providing equal cutting conditions for the two parts, the detail feed movement m reported in mutually opposite directions.

Description

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The invention relates to the processing of materials by cutting with rotating cutters and can be used in engineering for the manufacture of cylindrical parts.

There is a known method of rotational turning, according to which rotary movements around their axes are reported to a circular cutter and two simultaneously processed parts, and details of feed 1.

The disadvantages of this method are the low quality of processing and the increased power required for cutting, since equal conditions of cutting the two parts are not ensured. . The aim of the invention is to increase the machining quality by providing equal cutting conditions for the two parts.

The goal is achieved by the method of rotational turning, which implies that the rotary cutter and two simultaneously processed parts are reported by rotational movements around their axes, and the details are reported by feed movements, feed movements by parts of jointly opposite directions.

The drawing shows a diagram of rotational turning of two parts simultaneously.

The cutter 1 is reported to rotate around its axis at a speed of Vp, and parts 2 and 3 show rotational movements around its axes at a speed of Od and movement of a feed at a speed of Vs in mutually opposite directions. When cutting, the stock removal from both parts is carried out simultaneously or from the minimum thickness of the cutting layer to the maximum, or from the maximum thickness of the cutting layer to the minimum depending on the direction of rotation of the tool. This ensures the same working conditions (power and heat load, etc.) of the parts of the cutting edge of the tool involved in cutting parts.

When finishing parts, when the removed allowance is small, the cutter is rotated counterclockwise, i.e. the direction of the speed of rotation of the cutter in its vertex. The same direction is opposite to the feed speed of Uzdetal. In this case, the chips come down in the direction of the surface to be treated, do not scratch the treated surface, and thereby improve the quality of processing. In addition, the condition of the cut layer and the deformation under the cutting scheme from the minimum slice thickness to the maximum contributes to the formation of a high-quality machined part surface. At the same time, due to the smallness of the removed allowance, the power needed for cutting is small.

In semi-finishing and rough machining of parts, when the value of the removed allowance is larger, the cutter is rotated in an hour arrow, i.e. the direction of the speed of rotation of the cutter in its vertex is set equal to the direction of the feed rate Vj of parts. In this case, the cutter seems to roll with slippage over the surface of the part, which helps to reduce the axial cutting force (under certain cutting conditions it can take a zero value) and reduce the power of the cutting process. The quality of processing in this case does not play a significant role, since the part is subject to subsequent processing.

Example. Initial data: the processed material - steel 50; workpiece diameter D 100 mm; tool - a round cutter made of high-speed steel Р6М5 diameter, d 50 mm; front angle sharpening tool - 0 °; rear angle - 12 °; the speed of the main movement (rotation of the workpieces) Hits 2.5 m / s; the ratio of the linear speeds of the cutter and the workpiece is 0.2; feed Vs 0.3 mm / rev; cutting depth t 1 mm.

Adjust: workpiece rotation speed

1000 VP 1000

A - -D

cutter rotation speed

п yooo№, 5 PgrTSTd 3, W-50

 3.2 rev / s;

feed Vs 0.3 mm / rev; cutting depth t 1 mm.

During the processing, the workpiece is informed by rotational movements in opposite directions with a frequency of 8 rev / s and oppositely directed forward feeding movements along the axes of rotational movements with a speed Vs 0.3 mm / rev of the workpiece (2.4 mm / s); cutter - rotational movement with a frequency of 3.2 rev / s.

The components of the cutting force are measured using a UDM-600 dynamometer of the VNII design and production, and the roughness of the machined surface of the part is measured using a profile profilometer-profilometer mod. 252.

When processing by the proposed method, with opposite directions of rotation speed of the cutter and the movement of the detail feed, the axial component of the cutting force RL is 2400 N, and the roughness of the machined surface of the part is Rz 18 µm ; 24 microns When machining according to a known method, the axial component of the cutting force in any direction of rotation of the P 3200 N cutter, —shafero 311276904

the surface of the treated surface is also improved by

details R 22 microns, another R 30 microns. ensuring equal conditions of cutting with a cutter

Thus, the proposed method of cutting (temperature, pressure, force and

in comparison with the known, it allows to reduce the etc.) when processing on the proposed

Stitching the axial component values eliminates vibration and increases

cutting power and thus cutting power, tool life.

two parts. In addition, equal conditions

Claims (1)

A METHOD OF ROTARY TURNING, according to which a circular cutter and two simultaneously machined parts are informed of rotational movements around their axes, and to the parts - feed movements, characterized in that, in order to improve the quality of processing by ensuring equal cutting conditions for two parts, the feed movements to the parts are reported in mutually opposite directions.