SU1349903A1 - Arrangement for cutting pipes - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in mechanical engineering for cutting pipes. The purpose of the invention is to increase the productivity and reliability of a pipe cutting device. In the device opposite the internal cutting disc 1, the support roller 3 is installed in the direction of its working feed. The external cutting discs 2 are installed on opposite sides of the support roller 3. The angle of the point of the internal cutting disc is 45-90. The sharpening angle of the outer cutting discs is 10-30 °. When operating the device, the inner disk 1 first cuts through the groove inside the pipe with a depth of 1 / 2-1 / 3 wall thickness. Then the disks 2 cut through the thinned part of the pipe. 5 il. 00 NU () CO O CO (Par.1

Description

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The invention relates to the processing of metals by pressure and can be used in mechanical engineering for cutting pipes into dimensional workpieces.

The purpose of the invention is to increase the productivity and reliability of the device for cutting pipes

Figure 1 shows a device for cutting pipes, with the initial polonenie cutting discs and a support roller; figure 2 is a section in figure 1, the initial position of the internal cutting disc; Fig, 3 - the same, the final position of the internal cutting disc; figure 4 - section bb in figure 1; figure 5 - sketch of the cut piece.

The device for cutting pipes contains the inner 1 and outer 2 cutting discs. Opposite the internal cutting disc t, the support roller 3 is installed in the direction of its working feed. The external cutting discs 2 are mounted on opposite sides 1 of the support roller 3 and each axis is displaced by 90. The cutting edges of all cutting discs are in the same plane. The internal cutting disc is mounted with the possibility of rotation and vertical movement, and its angle of sharpening is 45-90 °. The taper angles of the outer cutting discs are 10-30 °.

Decreasing the calibration angle of the inner cutting disc (45 °) sharply reduces the tool strength and decreases the axial tensile forces arising from the wedge angle of the disc. An increase in the angle of the inner disk above 90 ° leads to a sharp increase in radial forces during the insertion, and since the inner diameter of the disk is limited and it cannot be structurally increased (it is inside the pipe), this leads to a decrease in the performance of the bearing units of the cutting disc. cantilever and with increasing radial loads increases its deflection, which leads to tool vibration and breakage.

When the sharpening angle of the outer discs (10 °) decreases, the strength of the cutting discs decreases (due to

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nor the cutting zone of the tool), and an increase in the angle (30) causes the formation of an internal burr larger than the height of the groove formed by the internal cutting disc.

The device works as follows.

In the initial position, the inner g cutting disc t is installed with the calculation of the guaranteed gap between its cutting edge and the inner diameter of the batch (gauge) of the pipe to be cut, and the outer disks 2 are separated by a value slightly larger than the outer diameter of the batch of pipes to be cut.

The pipe 4 to be cut is installed along the axis of the cartridge (not shown), clamped therein and is rotated by means of the cartridge. The inner cutting disc 1 is moved in the direction of the pipe and 25 an annular groove is cut inside the pipe with a depth of 1 / 2-1 / 3 wall thickness. Thereafter, the outer discs 2, receiving a radial movement, are brought to the pipe and cut through the thinned wall of the pipe. Cut off work 5 is removed. Further, the pipe 4 is moved in the axial direction by the size of the cut piece and the cycle of sections is repeated.

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Claims (1)

Apparatus of the Invention A device for cutting pipes containing a mechanism for clamping and rotating a pipe, internal and external cutting discs with a drive for their radial movement, characterized in that, in order to increase productivity and reliability, it is equipped with a support roller mounted opposite the inner cutting disc in the direction of its working feed, and an additional outer disc mounted symmetrically to the main outer disc relative to the axis of rotation of the pipe, while both outer discs are offset relative to the reference a roller at 90 °, and the angle of sharpening of the outer discs is 10 ... 30 °, the angle of sharpening of the inner disc is 45..90 °, and the cutting edges of all cutting discs are located in the same plane. to A-A // f / one v //// T / w /// /////// 11 / l , Fig.Z WM7 ////. w ///// m FIG. five Editor E. Papp Compiled by Y. Filimonov Tehred L. Serdyukova Proofreader A.Obruchar Order 5216/10 Circulation 970 Subscription VNSHPI State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production printing enterprise, Uzhgorod, st. Project, 4