SU1041021A3 - Apparatus for continuous hot rolling of sleeves into seamless pipes without rotation - Google Patents

Abstract

Planetary skew rolling mill, for the continuous rolling of tube blanks into seamless tubes. On the inlet side of the mill is a mandrel rod, which can be driven through the blank so the mandrel is in the deformation zone (a) of the mill; and the mandrel can be held in zone (a). The inlet side of the mill is pref. fitted with a guide tube through which the blank is pushed by a tubular feeder contg. an axial hole (b); and the mandrel rod travels through hole (b). The tubular feeder pref. has an external flange used to push the blank through the guide tube; the feeder and the mandrel rod move independently of each other. The mandrel rod extractor used on conventional mills can be eliminated.

Description

4ib N9 The invention relates to a pipe rolling plant for the manufacture of non-seam pipes, preferably from round billets. Various pipe-rolling plants are known that contain, necessarily on a heating furnace, a device for flashing a continuous billet into a sleeve in the form of a cross-helical rolling mill or a press, one of the rolling mills, for example cross-helical rolling or continuous, to roll the sleeves into pipes on a mandrel and reduction and stretching machine to reduce the diameter of pipes G1. Known pipe rolling installations provide a heating device in front of the reduction mill, which does not allow the station to be located in close proximity to the previous rolling mill due to the availability of auxiliary equipment and to organize a continuous process with the latter. Also known is a pipe rolling one hundred helical rolling, comprising a housing with tapered rollers and their planetary drive 2, the Mill provides rolling of the workpiece without rotating it during processing, but has no connection with the reduction mill. The closest to the technical essence is an installation for continuous hot rolling without rotating the sleeves into seamless pipes, including a helical rolling mill with planetary-rotating rollers, a mandrel rod located in the deformation zone, carrying the axial movement located in the deformation zone, the axial mechanism liner feed; and a pipe reduction mill located coaxially with the first mill. Tracked traction devices are located between and in front of the mills, which carry out continuous axial feeding and pulling the liner through the mills and keep the liner from rotating. For each mill, an inductor is installed for heating or heating in accordance with the mode that provides thermomechanical hardening of the rolled GB 3 pipe. The availability of ancillary equipment between the mills. Increases the length of the entire installation and increases the cost of the equipment. I2 The purpose of the invention is to reduce the construction costs and installation length. The goal is achieved by the fact that in an installation for continuous hot rolling without rotating a hil in a seamless tube containing a helical rolling mill with planetary-rotating rollers, located on the inlet side is a mandrel rod carrying a mandrel displaced in the deformation zone , the mechanism of axial feeding of the liner and the mill for reducing pipes, located coaxially with the first mill, the mill for reducing pipes is located directly. During the helical rolling mill, rolls cat cerned are provided with rotational drive, and its mandrel rod is mounted for axial movement mechanism for at least the length of the sleeve. The drive rolls allow the transport devices between the mills to be abandoned, bring them closer and reject the heating device before the reduction mill, since the pipe leaving the helical rolling mill retains the temperature sufficient for reduction. Fig. 1 schematically shows a helical rolling mill with rotating drive planetary rollers for the continuous rolling of pipe blanks into seamless pipes in line with the reduction mill, longitudinal section; 2 shows a pipe installation, top view. The installation comprises a cross-threaded tube rolling mill, having a base 1, in bearings 2 and 3, a hollow shaft 4, around which, by means of bearings 5 and 6, the holder 7 is rotatably mounted with three bearing bodies 8 which are displaced relative to each other by 120 with 8 accumulators work rolls 10 (only one upper bearing housing with a roller is shown |. The holder has a crown 11 that interacts with gear 12 driven by an electric motor 13. On the hollow shaft is a central And-and-up solar wheel The gear wheel 15, connected via gear 16, with the motor of rotation 17 of the hollow shaft with the possibility of adjustment or control and with a decrease in the number of rotations, interacts with the sun wheel. Three planetary wheels 18 are located in the holder, which are engaged with the intermediate wheels 19 provided on the water shafts of the bevel gears 20, which cooperate with the bevel gears 21 arranged on the shafts of the work rolls so that the bearing housing can rotate somewhat on its base, and in The rolls have a slight deviation from the corresponding radially directed to the hollow shaft planes, and their continuations cross the axis of the billet at a slight distance so that, during operation, the billet is moved forward. Wiring 22 is passed through the hollow shaft to direct the workpiece to the mill, 8 there is located an axial feed mechanism for a sleeve in the form of a pusher 23 with a flange and a drive from a power cylinder 25, which transmits a force to a protrusion 27, made in the form of a flange by means of a piston rod 2b, an axial mechanism displacement of mandrel rod 28 with mandrel 29 made in the form of an ST cylinder- connected with the rod by a lead 30, located coaxially and directly, behind the cross-helical rolling mill of the reduction and expansion mill, consisting of several stands 3 2 with calibrated rollers. Such an installation is part of a pipe-rolling installation containing a heating furnace 33, center 3 and piercing mill 35, after which a cross-screw rolling mill with a planetary one is installed: rolls and a reduction-expansion rolling mill. The device works as follows. When heated, the centrifugal billet enters the piercing mill 35, is stitched into the sleeve and is transferred to the front table of the helical rolling mill before positioning 22. The rod 28 of the mandrel 29 and the pusher 23 are retracted so far back by their cylinders 31 and 25, so that the sleeve can accommodate The pusher then sets the sleeve to the guide wiring. At the same time, the power cylinder 31 is turned on and the mandrel bar 28 is pushed forward until then. until the mandrel 29 enters the area of the work rolls 10. In this case, the piston of the power cylinder 31 reaches its end position, so that the rod with the mandrel is in this position. If necessary, an additional fixation of the clamp can be provided, by means of which the mandrel bar can be clamped and fixed upon reaching the end position. Subsequent slow forward movement of the pusher 23 gives rise to the billet to the area of the work rolls 10. When rolling at a fixed or slowly rotating hollow shaft by means of a solar (center) wheel And with the electric motor 13, the roll holder 7 is rotated through a crown 11. Its planetary wheels 18 with this wheel are on the sun wheel 1 and through the intermediate wheels 19, the bevel wheels 20 and 21 rotate the shafts 9 of the work rolls 10. The transmission from the sun wheel And to the bevel wheels 21 is chosen so that with a fixed floor During the one rotation of the holder 7, the work rolls 10 with their effective average diameter could roll the tubular billet between them in the forming zone to the corresponding diameter. At the same time, the shafts of the work rolls are inclined with respect to the axis of the billet so that the bearing body 8 is slightly rotated around the shafts of the intermediate wheels 19, so that due to this inclined position, the billet slowly moves from left to right and when axially stretching and reducing the lateral sections and gradually rolled out on the mandrel into the pipe. The advantage of a cross-screw rolling mill with rotating planetary rolls with water is that no rolling force is applied to the rolled material, as a result of which the rolled material does not rotate during rolling. The pipe coming out of the rolls 10 immediately falls into the first cage 32 of the reduction-expansion rolling mill. Heating of the pipe between the helical rolling mill and the reduction-expansion rolling mill is not required, since the pipe retains / sufficient temperature after heating in the furnace 33.

The pipe in a hot condition is captured by the rollers of the reduction and expansion rolling mill and subjected to continuous rolling to the finished state. The speeds of the individual roll sets are adjusted so that longitudinal tension occurs in the pipe. The pipe diameter and wall thickness become smaller, and the pipe length increases. After leaving the rear end of the sleeve from the camp.

a helical rolling mandrel bar 28 with a mandrel and a pusher 23 to initiate a new rolling process are driven so far from the guide cage 22; so that the next pipe billet can be fed.

The proposed installation simplifies the manufacturing process, the pipes, makes it possible to get rid of the intermediate heating furnace, the rolling mill has a draw ratio of 12, which determines the high productivity of the installation.

Compiler L.Maturina Editor A.Dolinich Tehred Z.Kastelevich Proofreader V.Girn to

Order Circulation 816 Subscription of VNIIPI USSR State Committee

for the cases of inventions and discoveries 113035, Moscow, Zh-35, Raushsk§ n., D. V5

Branch PPP Patent, Uzhgorod, st. Design,.

Claims (1)

INSTALLATION FOR CONTINUOUS HOT ROLLING WITHOUT ROTATION OF CASES IN SEAMLESS TUBES, containing a cross-helical rolling mill with a plan. tare-rotating rolls, a mandrel bar located on the inlet side, bearing a mandrel located in the course of deformation, an axial movement mechanism, an axial feed mechanism of the sleeve and a pipe reduction mill, located coaxially with the first mill, being different from that, in order to reduce design costs and installation length, the pipe reduction mill is located directly behind the cross-screw rolling mill, the rolls of which are equipped with a rotation drive, and its mandrel shaft is installed with power of creep movement by the mechanism at least by the length of the sleeve. SU „1041021 h