SU863028A1 - Device for moving mandrel rod - Google Patents

Description

(54) DEVICE FOR DISPLACEMENT MOVEMENT The invention relates to pipe production, in particular to cold piligrim rolling, and relates to an improvement in the device for moving the mandrel rod of a cold rolling mill pipe, mainly with a stationary bed. A device for moving a mandrel bar of a cold-rolling mill pipe, comprising a creep-and-slide mechanism, in which a rod with a mandrel and a feed screw interacting with the workpiece chuck are mounted, is known. With a uniform rotation of the crank of the crank-slider mechanism, the change in the speed of movement of the slider is carried out according to the sine law, with an uneven rotation of the crank, a sinusoid is rectified, i.e. the slider (mandrel and the workpiece) move in the process of deforming the work rolls of the workpiece at a constant speed close to the linear speed of uniformly rotating work rolls. Uneven rotation of the crank in a known drive is achieved by the fact that the main crank neck of the crank is rotated in the drive shaft eccentric about the axis of the shaft, and the crank neck interacts with the guider with which the drive is driven and leads to a return shaft; slider-mandrel and billet. The drive shaft and the carrier are coaxial, rotate evenly, but with different angular speeds, and the crank, interacting with two asynchronous drive links, receives an non-parallel rotation. The nature of the irregularity of rotation of the crank, in other words, the process of rectifying the sinusoid in a known drive depends on the eccentricity of the crankshaft crankshaft axis relative to the axis of the drive shaft and the length of the crank; Therefore, when rolling pipes along various technological routes, of which causes its irregularity of rotation of the crank, it is necessary to replace the node of attachment of the main crank neck in the drive shaft and the hatching itself depending on the rolling route 1, However, such a constructive use of the well-known drive when

relative rotation involves the crank neck, predetermines many components of replaceable drive elements, and often replacing them significantly lengthens the current downtime of the mill and is inconvenient because it is associated with complex installation work.

It is also known a device for moving a reference rod of a cold rolling mill tube containing a carriage supporting rod of a mandrel, a carriage connected to it by a crank mechanism, and a drive for reciprocating movement of a connecting rod having a groove guide mounted on it with a slotted guide arranged therein a slider mounted on a crank, the driven shaft of which is located eccentrically relative to the carrier shaft. In this drive, there is no relative rotation of the finger of the cranks, and therefore the nature of its uneven rotation with a constant length depends on the misalignment of the driven shaft and the carrier shaft, the optimal value of which was chosen in the design and satisfies the condition that the moving speed of the mandrel and the workpiece is consistent with the linear speed of uniformly rotating workers rolls when rolling a fairly wide range of pipes in diameter and wall thickness 2.

 However, when using work rolls with dramatically varying steepness gauges in the mill, which allow a rolling process with a higher degree of deformation, when the linear speed of the work rolls is constant only in the calibrating area, and in the zone of active deformation it continuously increases depending on the increase in rolling radius rolls, it is necessary to change the nature of uneven rotation of the driven shaft with a crank depending on the rolling route. The absence in the known regulator device of uneven rotation of the driven crank shaft makes it impossible to control the process of rectifying the sinusoid depending on the nature of the change in the rolling radius of the work rolls. Thus, the design of the known device of the reciprocating motion of the mandrel and the workpiece does not allow to easily and easily change the nature of the uneven rotation of the crank of the crank mechanism and allows a significant mismatch of the linear speeds of the work rolls, the mandrel and the workpiece. The phenomenon of prokal-) 3yaiai work rolls relative to the deformable surfaces of the workplaces negatively affects the quality of rolled tubes, especially from metals and alloys, prone to sticking to the working tool.

The aim of the invention is to reduce the current downtime by adjusting the uneven rotation of the crank shaft, depending on the rolling route.

The goal is achieved by the fact that in the device for moving a reference rod, a carriage supporting a supporting rod, a carriage connected to it, a crank mechanism, and a drive for reciprocating movement of the connecting rod, having a carrier mounted on the drive shaft, with a slotted guide, a slider mounted in it, mounted On the crank, on the crank shaft, the axis of which is eccentric relative to the axis of the drive shaft, a through transverse groove is made in the slotted guide shaft carrier relative to which the guide in the carrier is pivotally mounted and movable in a plane perpendicular to the axis of the carrier.

FIG. 1 shows a device for moving a reference rod; general view; in fig. 2 shows section A-A in FIG. 1, in FIG. 3 shows a section BB in FIG. 2; in fig. 4 - the same, the moment of movement and rotation of the guide.

The device for moving the reference rod of the cold rolling mill tube includes a carriage 1, a supporting mandrel rod 2 and a feed screw 3 connected to the feed cartridge 4, a crank mechanism with a connecting rod 5 and a crank 6, and a drive for reciprocating movement of the connecting rod having the drive shaft 7 led 8 with a slotted guide 9, a slider 10 placed in it, mounted on the crank 6, which is mounted on the driven crank shaft, 11. The axis of the driven shaft is located eccentrically relative to the axis of the shaft of the carrier 8 and is offset relative to nowhere by the magnitude of the eccentricity E. The carrier 8 is rigidly fixed to Z-evil 7, which by means of bearings 12 and 13 is installed in the housing 14 and is kinematically connected to the stanned engine (not shown) the slotted guide 9 has a through transverse groove 15 under the shaft 7 of the carrier 8. The slotted guide in the carrier is mounted rotatably relative to the All carrier at an angle d and displaced by an amount B in Shkosk 5, perpendicular to the axis of the carrier. Liv ustanavlivayu1s ranks depending on the route of rolling. To move and rotate the direction of the slide, four pressure screws D6 are installed, which cooperate with the threading of the carrier. The driven shaft 11, on which the crank is located, is mounted in the housing 17 on bearings 18 and 19 and connected to the carriage 1 via a connecting rod 5. On the crank, a slider 10 is mounted with bearings 20, which interacts with the guide 9 and one of the connecting rod heads 5 , the other head of which is hingedly connected with the carriage 1. The housing 14 and 17 are rigidly fixed on the frame 21, in the guides 22, in which the carriage 1 and the cartridge 4 are placed to hold the grommet 23.

The drive for the reciprocating movement of the mandrel and the billet of the cold rolling mill tube works as follows.

When the motor is turned on, the work rolls and the shaft 7 of the carrier 6 are driven in uniform motion. Together with the shaft 7 in bearings 12 and 13, the guide 8 rotates uniformly and the guides fixed in it by means of pressure screws 16. When rotating, the guide acts on the slider 10 and through the bearing 20 on the crank of the driven shaft 11, the axis of rotation of which is eccentrically shifted relative to the axis of rotation of the carrier and guideline by the value e. The presence of eccentricity e causes, during rotation, a periodic change in the distance from the axis c ascheni carrier rails 8 and 9 to the crank axle, or a continuous variation over one revolution of the gear ratio between the master carrier and the slave crank shaft, which is not otherwise Thu as converting a uniform rotation of the guide and guide to the uneven rotation of the driven shaft and. The crankshaft driven shaft 11, rotating with variable angular speed in bearings 16 and 19, acts with crank b through bearing 20 on the connecting rod 5, which converts the rotational movement of the crank shaft into reciprocating movement of the carriage 7. Mounted in the carriage 1 rod 2 with a mandrel and the feed screw 3, cooperating with the chuck 4 for holding the workpiece 23, is also driven in a reciprocating motion. The carriage and the cartridge 4 move in a straight line in the direction of the bed 22 21. When the mill operates with continuously rotating rollers in the stationary working stand, one revolution of the work rolls corresponds to one revolution of the cryo-bearing driven shaft and two strokes (forward and reverse) of the mandrel and the workpiece, during the forward stroke, the workpiece is deformed by the work rolls on the mandrel, and in the reverse process, the blank is fed relative to the mandrel and simultaneously rotated together. The feeding and turning are carried out by a periodic action mechanism (not shown).

The main, drive function of the reciprocating motion of the mandrel

0 and the workpiece is the provision of synchronous movement with the workpiece during the forward rolling process in an uneven rotation of the crank shaft.

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The proposed technical solution provides the ability to control the uneven rotation of the driven shaft depending on its rolling route, which reduces the current downtime, improves the accuracy of matching the speed of movement of the mandrel and the workpiece with the linear speed of the work rolls, improving the quality of rolled tubes.

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Claims (2)

1. Authorship of the USSR. No. 597139, cl. B21 B-25/02, 1974. 2. Authorship certificate of the USSR 735343, cl. B21 B 25/02, 1977. bs  i, chlu