SU1489925A2 - Device for cutting thin-wall pipes - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to devices for cutting thin-walled pipes into dimensional workpieces. The purpose of the invention is to expand technological capabilities and increase productivity by increasing the depth of penetration of the cutting edges of knives. The device comprises a housing 1, a rotatable yoke 13, in the slots of which slides 19, 20 with knives 21, 22 are mounted, the rotational drive of the holder and the mechanism for moving the knives 21, 22. The latter is made in the form of a plate 6 with a spiral end groove mounted on the housing 1 in a plane parallel to the plane of the rotary sleeve 13, and fingers mounted on sliders 19.20 with the ability to interact with the walls of the front spiral groove of the plate 6. The latter is mounted on the housing 1 with rotatable and kinematically connected through a gear unit 15, 16 and 25.7 with a rotational drive of the yoke 13. The transmission unit between the shaft 14 and the plate 6 is equipped with a clutch mechanism in the form of an end gear coupling 28 driven by a power cylinder 32. On the rack 3 of the housing 1 a spring-loaded pawl 10 is mounted, which is arranged to interact with the tooth on the plate 6. The cutting edges of the knives 21,22 are set at an angle to the plane of movement of the sliders 19,20. 8 il.

Description

The device includes a housing 1, a swiveling yoke 13, in the slots of which sliders 19, 20c are mounted with knives 21, 22, a rotational drive of the yoke and a mechanism for moving knives 21, 22. The latter is made in the form of a plate 6 with a helical groove fixed on the housing 1 in the plane parallel to the plane of the rotary casing 13, and the fingers mounted on the sliders 19, 20 with the ability to interact with the walls of the front spiral groove of the plate 6. The plate 6 is mounted on the housing 1 with the ability

rotation and kinematically connected through a block of gears 15, 16 and 25, 7c driven rotation of the yoke 13. The transmission unit between the shaft 14 and the plate 6 is equipped with a clutch mechanism in the form of a mechanical gear coupling 28 driven by the power cylinder 32. On the rack 3 of the housing 1 is mounted spring-loaded pawl 10 placed with the possibility of interaction with the tooth on the plate 6. The cutting edges of the knives 21, 22 are set at an angle iC to the plane of movement of the sliders 19, 20. 8 Il.

The invention relates to the processing of metals by pressure, can be used in mechanical engineering and is an improvement of the device for cutting thin-walled pipes according to the ed. St. No. 1263.447.

The purpose of the invention is to increase the productivity of a device for cutting thin-walled pipes and expanding its technological capabilities.

FIG. 1 shows a device for cutting thin-walled pipes, a general view, a section; in fig. 2 is a section A-A in FIG. one; in fig. 3 is a section BB in FIG. one; in fig. 4 - section bb In figure 1; figure 5 - section GG in figure 2; in fig. 6 is a section dD in figure 2; in fig. 7 is a view E of FIG. four; in fig. 8 is a diagram of the movement of the knife.

The pipe cutting device comprises a housing 1 on which racks 2-4 are fixed. On the rack 3, a re-plate 6 is mounted on the bearings 5, equipped with a gear crown 7 and helical crests 8. On the rack 3, a spring-loaded ratchet pawl 10 on the plate 6 is also mounted on the axis 9. In the holes of the rack 2 hubs a shaft 12 is installed with a yoke 13 and a drive shaft 14 with a gear wheel 15 meshed with a gear ring 16 fixed to the yoke 13. In parallelly arranged slots 17 and 18 of the yoke 13, sliders 19 and 20 are mounted with saw-blades mounted on them 21 and 22. Crawling on ax x 23 new 19 and. 20 mounted rollers 24 included in the spiral grooves

five

0

between ridges 8. A gear wheel 25 is mounted on the shaft 14, secured against axial movement by a ring 26. On the splined shaft portion 27

14 a clutch 28 is installed, kinematically connected by means of a fork 29 and a rod 30 to a piston 31 of a power cylinder 32 mounted on a stand 4. A working cavity 33 is formed in the cylinder 32. The piston 31 is pressed

in the initial position, the spring installed in the rod end of the cylinder 32. On the front parts of the coupling 28 and the wheel 25, teeth 35 are provided that engage in mutual engagement. The lateral contacting sides of the teeth 35 are located at an angle aC lower than the self-locking angle.

A cylinder 36 with 37 is mounted on a post 3 in which a piston 38 with a hollow rod 39 is installed and working cavities 40 and 41 are formed. A collet clamp 42 is mounted in the axial hole of the rod 39, fixed against axial movement relative to the rod 39 with a nut 43, but having limited axial movement relative to the stem. Gear ratio between gear wheel

15 and the gear rim 16 of the yoke 13 is chosen smaller than between the gear. wheel 25 and the toothed crown 7 of the plate 6. The shaft 14 is connected to a reversible rotational drive (not shown). The cutting edges of the knives 21 and 22 are located at an angle b to the plane of moving, moving the sliders 19 and 20 (Fig. 2). Position 44 marked the pipe being cut, 45 - cut the workpiece.

The device works as follows.

In the initial position, the sliders 19 and 20 are retracted to the periphery of the casing 13 (Fig. 2), the collet chuck 42 is expanded, the cavity 33 of the cylinder 32 is under pressure, the coupling 28 is engaged with the wheel 25. The pipe

44 is fed in the direction of the arrow G for the length 1 of the cut-off workpiece 45 and supplying compressed air into the cavity 40 of the cylinder 36 is fixed with a collet clamp 42. By turning on the drive of the rotation of the shaft 14 of the ferrule 13 and the plate 6, rotation is indicated, and the rotational speed of the ferrule 13 is higher

angular speeds of rotation of the plate 6, whereby the rollers 24 of the sliders 19 and 20 move in grooves with the ridges 8 and communicate the sliders 19 and 20 simultaneously with the rotation to the movement in the opposite direction. The knives 21 and 22 cut into the wall of the pipe 44. For each complete revolution of the casing 13, the slide blocks 19 and 20 with the knives 21, 22 move by a length t (Fig. 8), which depends on the difference in the angular velocities of the casing and the plate. Thus, the full stroke of the knives 21 and 22 for the length T is carried out for several turns of the casing 13 around the pipe 44. After the cutting process is completed and the rotation of the casing 13 stops at a certain angular position, the cavity 33 of the cylinder 32 is connected to the atmosphere. The spring 34 moves the piston 31 to the initial position, which through the rod 30 and the fork 29 moves the clutch on the pinch section 27 of the shaft 14, while the teeth 35 between the edue clutch 28 and the wheel 25 are disengaged and the wheel 25 comes out of the engagement with the shaft 14 ..

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By activating the rotation of the shaft R in the opposite direction, the yoke 13 rotates to its original position, making a rotation at an angle slightly exceeding 360f. The pawl 10 entering into engagement with the tooth of the 11. plate 6 rotates the plate 6. The rollers 24 of the sliders 19 and 20

10 move in the spiral grooves between the ridges 8 of the plate 6 and slide the sliders 19 and 20 with the knives 21 and 22 to the initial position (by the length T), and then into the cavity 33 cylinder 32

15, compressed air is supplied and the coupling 28 engages with the 25F wheel. By supplying the compressed air to the cavity 41, the collet chuck 42 is moved to the initial position by the piston 38 and

20 is opened. The next cycle of feeding, clamping and cutting the pipe is carried out in a similar sequence.

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Claims (1)

The invention The device for cutting thin-walled pipes according to ed. No. 1263447, characterized in that, in order to expand the technological capabilities and improve performance, the plate is cylindrical with a ring gear, mounted tta on the base can be rotated and kinematically connected to the rotational drive of the yoke by means of the gear unit | a dog mounted on its stand with the possibility of interaction with the ring crown of the slab, and the gear unit between the drive shaft and the slab is equipped with a clutch mechanism face coupling with a drive of its power cylinder. A a Fig.Z FIG. Yr PI 21 20 Thebes, 5 Fie.7 21.22 Phage. eight