RU2793302C1 - Method for processing the end surface of the sleeve in the rotary line - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: invention relates to the field of mechanical engineering and can be used in turning bodies of revolution in rotary lines. The method for processing the end surface of the bushing in the rotor line includes moving the bushing and the tool along a circular path around the rotor axis. In this case, the sleeve is rotated at the cutting speed, and the tool is given axial and radial feed movements. The tool is fed along a circle, the plane of which is tilted relative to the rotor axis in tangential and radial coordinates, while the tangential inclination is directed against the feed movement and set less than the radial one. The feed axis is displaced in radial and tangential coordinates relative to the axis of the sleeve and is displaced towards the feed direction, maintaining the ratio: R₂+R₃>L, where R₂ is the inner radius of the sleeve, R₃ is the tool feed radius, L is the distance between the axes of the bushing and tool feed. The tool is removed from the cutting zone along a lower and steeper trajectory, while the burr is cut off.

EFFECT: improved quality of end surface turning due to deburring after end trimming.

1 cl, 4 dwg

Description

The invention relates to the field of processing thin-walled bushings in multi-position automatic machines and automatic rotary lines and can be used in the manufacture of cartridge cases for small arms.

There are known methods of turning bushings in rotor lines, according to which the parts are moved along the circumference of the rotor and rotated at a cutting speed, and the tool is given axial and radial feed movement [SU 1511186 A1 09/30/1989, SU 1404203 A1 06/23/1988, SU 1710302 A1 07.02. 1992, Koshkin L.N. Rotary and rotary conveyor lines. - M. Engineering, 1986, p. 97].

The closest technical solution is a method implemented in a rotor for processing bodies of revolution, in which the workpiece and tool are moved along a circular path around the axis of the rotor, the workpiece is rotated at a cutting speed, and the tool is given independent, axial and radial (perpendicular to the axis of rotation of the workpiece), movement from the cams [Koshkin L.N. Rotary and rotary conveyor lines. - M. Mashinostroenie, 1986, p. 99].

Common features of the prototype and the proposed method are: circular movement of the workpiece and tool around the axis of the rotor, rotation of the workpiece at a cutting speed and axial and radial feed of the tool.

) металл продавливается, а не режется и заусенец получается больше чем на остальной поверхности. В результате, при калибровке внутреннего диаметра специальным пуансоном, заусенец заминается внутрь и изменяет геометрические размеры, а именно - смещается ось гильзы на торцевом срезе, что в дальнейшем приводит к некачественной сборке изделия, а именно, появляется наклон и смещение оси пули относительно оси гильзы, что приводит к нарушению баллистики ее полета, и как следствие снижению точности и кучности.Method - prototype have the following disadvantages. When the tool is fed perpendicular to the axis of the workpiece, a burr forms on the inner cut at the end of cutting. Moreover, on a part of the circle (approximately

) the metal is pressed through, and not cut, and the burr is larger than on the rest of the surface. As a result, when calibrating the inner diameter with a special punch, the burr is crumpled inward and changes the geometric dimensions, namely, the axis of the sleeve is displaced on the end cut, which further leads to poor assembly of the product, namely, there is a tilt and displacement of the axis of the bullet relative to the axis of the sleeve, which leads to a violation of the ballistics of its flight, and as a result, a decrease in accuracy and accuracy.

The essence of the invention.

The task set during the development of the proposed method is to improve the quality of processing, namely, the removal of a burr from the inner surface of the sleeve during its end processing, by changing the relative trajectory of the workpiece and tool, without additional movements of the tool and/or workpiece.

The problem is solved as follows, in a known way [Koshkin L.N. Rotary and rotary conveyor lines. - M. Engineering, 1986, p. 99], according to the claimed method, the feed of the tool along the axis and radius is carried out by rotating the tool along a circle, the axis of which is inclined relative to the axis of the rotor in the radial and tangential directions, and is displaced relative to the axis of the part in the direction of feed movement in such a way that the relation is fulfilled:

R ₂ +R ₃ >L;

Where:

R ₂ - inner radius of the sleeve,

R ₃ - tool feed radius,

L is the distance between the axes of the part and the tool feed.

A distinctive feature of the proposed method is the combination of new relative movements of the workpiece and tool during processing in the rotary line.

Feeding the tool along a circle inclined relative to the axis of the rotor and shifting the feed axis relative to the axis of the part provides the ability to feed the tool along the axis and radius in one motion, shift the points of entry and exit of the tool from the cutting zone relative to the axis of the part, and change the cutting path, depending on tilt angles. In this case, the cutting path at the entry in the plunge zone will have an angle of inclination to the axis of the part less than in the zone of deburring and exit from the cutting zone. And since the point of maximum feed is shifted along the axis of the sleeve below the level of the end surface, then, a steeper trajectory at the exit, provides cutting off the burr.

Thus, the totality of the claimed distinguishing features ensures the fulfillment of the set technical task, i.e. they are all significant. No other technical solutions with similar features have been found in the patent and scientific and technical literature, therefore, the claimed method meets the criterion of novelty and inventive step.

In FIG. 1 shows the processing of a part in a rotary line, according to the associated turning scheme, in Fig. 2 - section A-A of Fig. 1, Fig. 3 - views A and B of Fig. 1.

The method of processing the end surface of the sleeve in the rotary line is as follows. Parts 2 are moved around the rotor 1 along a circular path of radius R ₁ at a speed V _p and rotated at a cutting speed V _∂ , and the feed S of the tool 3 is carried out according to the scheme of associated (or counter) turning with circular feed with a radius R ₃ . (Fig. 1). In this case, after trimming the end face, a burr 4 is formed on the inner surface of the sleeve. (Fig. 2) Since the feed plane is tilted relative to the axis of the rotor 1, then on the feed path S, the points of insertion a and the end of trimming the end face a ¹ are above the point of maximum tool feed in , which, due to the displacement of the O ₃ feed axis relative to the part axis in the feed direction, is located below the burr trimming point c, and the trajectory angle at the inlet β will be less than the angle at the outlet β ¹ . (Fig. 2) By tilting the tool feed axis in the radial of (Fig. 3) and tangential of1 coordinates, shifting the tool axis O ₃ along the circumference by the value e (Fig. 4), while rotating the tool 3 along the circle with radius R ₃ , and providing, at the exit from the cutting zone, the feed S of the tool along the axis and the radius along a steeper trajectory, without additional movements, cut off the burr 4. (Fig. 2)

Thus, the implementation of the proposed method in the rotary line provides deburring on the inner wall of the sleeve after turning the end, which accordingly improves the quality of processing and subsequent assembly of products, without additional movements of the tool and/or part.

Claims (5)

A method for processing the end surface of a bushing in a rotor line, which includes moving the bushing and the tool along a circular path around the axis of the rotor, while the bushing is rotated at a cutting speed, and the tool is given axial and radial feed movements, characterized in that the tool is fed along a circle, the plane of which is inclined relative to the rotor axis in tangential and radial coordinates, while the tangential inclination is directed against the feed movement and set less than the radial one, and the feed axis is displaced relative to the axis of the sleeve in the direction of the feed movement in such a way that the relation is fulfilled: R ₂ + R ₃ >L, where R ₂ is the inner radius of the sleeve; R ₃ - tool feed radius; L is the distance between the axes of the sleeve and the tool feed.

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