SU232925A1 - CONTINUOUS CHIP FORMING MILL - Google Patents

Description

A continuous pipe forming mill for the production of electric welding tubes is known. The mill includes drive deflection rollers, strip pre-bending stands, a number of successive stands and a stand With closed calibers. The vertical axes of all the forming stands are located strictly perpendicular to the horizontal: when bending the microscopic axis of the molding, its trajectory is stepped.

The proposed continuous pipe forming mill is characterized in that all of its molding stands are mounted on hinge bearings and mounted each on a pin of a pressure screw equipped with a worm gear for their angular adjustment in a vertical forming plane.

This allows the process to run along a smooth curved path and ensures consistency between the strip and caliber axes.

FIG. 1 shows a continuous pipe forming mill, general view; in fig. 2 — stand for pre-bending of the strip; in FIG. 3 - single vertical stand in two forms.

The drive driving rollers 1 are designed to feed the iB mill to the front end of the strip and to push the billet 2 through the mill rolls. To ensure the horizontal position of the billet in the welding caliber (not shown in the drawing), the pre-bend stand 3 tilts and the nolos out of it comes out at a predetermined angle to the horizontal.

The subsequent molding path is chosen from the optimal deformation conditions for a given pipe size; the vertical idle stands 4 are inclined so that their vertical axes are perpendicular to the longitudinal axis of the tubular billet included in them, which, molded, enters the stand with a closed caliber 5 (with a split washer) for final calibration for welding. Cage 5 also has the ability to tilt to create tension on the edges in the welding caliber.

Cage 3 for pre-bending has supports 6. On the counters 7 of the stand of the stand, mechanisms are installed for its angular adjustment, each of which, for example, consists of a worm gear 8 and 9 and adjustment screws 10 and /) with a ball heel 12. Nuts of adjusting gears the screws are the worm gears 8. The adjustment screws 10 and 11 have square shanks 13, which move in the respective guide covers 14, which prevent the screws from turning.

The rotation of the stand is carried out as follows. the rotation of the handwheel 15 of the right mechanisms (Fig. 2) causes the worm gear 8 to rotate through the worm 8. Lastly, the adjusting screws // move upwards from the plitovi-s 16 wa upward to turn the stand the Then, by turning the handwheel of the left mechanisms, but in the opposite direction, the adjustment screws 10 rest against the slab and thereby turn the cage relative to joint 6 to the required angle. After the stand is installed in the required position, it is fixed by slamming the adjusting screws // to the stop in the slab. In order to guarantee a reliable stop for all the adjustment screws and into the slab (backlash compensation in the details of the mechanisms of angular adjustment), the front (right-hand pas of Fig. 3) mechanisms can be activated separately from the prominent mechanisms (as shown in Fig. 2). The design of the mechanism of angular adjustment of the CRO and the stand with a closed caliber is similar. It is possible to use other mechanisms of angular adjustment: hydraulic, lever, etc. The casing of the cage 4 is installed on three supports: two hinges 17, separated from the center of the body, and the iajnny internal 18, which is articulated with the casing casing through the ball p 19 allowing the stand to be tilted. The pressure screw is connected via a worm gear 20 to a handwheel 21, the rotation of which informs a forward movement to a pressure screw, an inclined stand with rollers. The proposed continuous pipe forming mill provides the possibility of forming a strip on any curved path that is predetermined and bent in a vertical plane, creates conditions for forming thin-walled tubes and increases the allowable deformation on the cage. The subject of the invention is a continuous tube forming mill, including driving driver rolls, strip pre-bending stands, a series of consecutive forming idle vertical stands and closed-gauge stands, characterized in that in order to enable the strip to be formed along any predetermined and bent into vertical the plane of the curved path, creating the conditions for forming thin-walled tubes and reducing the length of the tube forming mill; all the forming stands are hinged on pores and are installed each on the pin of the pressure screw, equipped with a worm gear for their angular adjustment in the vertical plane of the molding.