SU1489869A1 - Inner mandrel of pipe-welding machine - Google Patents

Abstract

The invention relates to pipe production and m. Used in the reconstruction of old and the design of new pipe welding mills for the production of large diameter pipes. The purpose of the invention is to improve the quality and expansion of technological capabilities in welding pipes simultaneously with several welding heads. When welding a tubular billet 15 with several welding heads 8, the edges of the billet are held in the optimal position by the rollers 7, which are combined into cassettes 9 by the number of welding heads. Balancing mechanisms 11 cassettes provide the formation of a joint edge without exceeding the corresponding area. The design of the mandrel makes it easier to set up the device when the pipes are manufactured to a different size and to improve the quality of the welded joints of the pipes due to the optimum mutual alignment of the edges before welding. 4 il.

Description

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The invention relates to pipe production, in particular to internal mandrels of pipe welding mills, and can be used in the reconstruction of old and the design of new pipe welding mills for the production of large diameter pipes,. The purpose of the invention is to improve the quality and expansion of technological ig possibilities when welding pipes at the same time with several welding heads.

FIG. shows the inner mandrel of the pipe welding mill, a general view; FIG. 2 is the same, section A-A in FIG. on fig.Z - the same, type B in figure 2; figure 4 - node I figure 1,

The inner mandrel of the pipe welding-: 20 gr mill contains a frame 1 on which the upper and lower support rolls 2 and 3 are mounted, the lower 4 and the top 5 roll wires 5. The lower support rolls 3 are installed with a possible vertical movement using a balance mechanism 6 . Rollers 7 upper wiring 5 combined by the number of welding heads 8 in

them inside on the edges of the billet 15.

Taking into account that the forming surface of the billet 15 along the butt line has the form of a broken line due to the instability of dimensions between the edges at the beginning, middle and end of the semicylinders, roller cassettes under each welding machine 8 occupy a position at which the angle α is tangential to the surface the rollers and the horizon are identical to the angle of inclination of the generatrix of the tubular billet 15 in the corresponding section. In this case, the edges of the pipe billet 15 are aligned flat in the horizontal plane and form a joint without exceeding. After the technological seams are applied to the cuts 16, the welded pipe billet 15 is ejected from the march speed billet. The angle of inclination of those who form does not fall with the angle of inclination with respect to the wiring rollers, i.e. the vertical size of the mandrel is greater than the distance between the seams, the cassette is pressed out

cassettes 9, each / da of which among-. 50 preventing those sat-m breaks and

cracks technological seam. After the release of the billet, the compres- sion shafts 11 reestablish roller posting settings.

The mechanism 10 has the ability to move vertically bounded within the instability of dimensions along the length of the workpiece by the trimming mechanism 1I.

The mechanism 10 of the vertical movement of each cassette 9 is made in the form of a wedge movable from the screw 12. The mechanism 11 is developed in the form of spring-compensators 14

The device works as follows.

Tubular billet 15 with rollers of the lower stand 16 with the help of upper and lower supporting rolls 2 and 3 is internal (the mandrel is set by the front end to the axis of the latter during the movement of billet 15 of welding head 8 and stops.

Then, all welding machines 8 and drive of the stands are switched on simultaneously.

During its movement, the workpiece 15 acts through the rollers 7 of each cassette 9 on equilibrium mechanisms 11, which, limiting the vertical movement of the rollers 7, provide compression and impact

them inside on the edges of the billet 15.

Taking into account that the forming surface of the billet 15 along the junction line has the form of a broken line due to the instability of dimensions between the edges at the beginning, middle and end of the semicylinders, the roller cassettes 9 under each welding machine 8 occupy a position at which the angle α is formed by a tangent to the surface of the rollers and the horizon is identical to the angle of inclination of the generatrix of the pipe billet 15 in the corresponding section. At the same time, the edges of the billet 15 are aligned horizontally and form a joint without exceeding. After applying the technological seams with binder cells 16, the welded tubular billet 15 is ejected from the stanchion marching speed, and the inclination of the generatrix does not coincide with the inclination angle of the tangent to the wiring rollers, i.e. the vertical size of the mandrel is greater than the distance between the seams, press the cartridge down

preventing those sat-m breaks and

cracks technological seam. After the release of the workpiece, the compensating springs 11 restore the setting of the roller postings.

By changing the wall thickness. The welded pipe adjustment of the roller cassettes in height is driven by the movement of wedges.

Claims (1)

With the use of the invention, the time required for restructuring the mandrel is reduced and the quality of the pipes is improved by ensuring optimal alignment of the edges before welding. The internal mandrel of the pipe welding mill, containing the frame, the upper and lower supporting rolls and the lower and upper roller lines, is only that, in order to improve the quality and broaden the technological possibilities for welding pipes at the same time welding heads, the rollers of the upper roller wiring are combined into cassettes according to the number of welding heads, and each cassette is equipped with a balancing mechanism, made in the form of spring-compensators, and a moving mechanism in the vertical plane. f / Phi. Compiled by E.Vetrova Editor V.Kovtun Tehred A.Kravchuk Proofreader T.Kolb Zakae 3614/15 Circulation 693 & NIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab., D. 5 Manufacturing and Designing Plant Patent, Uzhgorod, st. Gagarin, 101 Subscription