SU912372A1 - Connecting tube production method - Google Patents

Description

(54) METHOD OF MANUFACTURING CONNECTING PIPES

one

The invention relates to the processing of metals by pressure, namely to the processing of connecting pipes, preferably for; pipelines (casing, tubing, etc.), characterized by the presence of profiled end sections with threading on them for connecting pipes by means of a coupling or bezmuftovogo connection.

There is a known method of processing and control of an oil pipe tubing, in which the pipe ends are profiled, threading them, screwing of safety rings and nipples over the pipe, gauging the pipe along its entire length and controlling it hydraulically with pressure with further control. weight, glue, paint and paint 1.

A disadvantage of this method is the considerable loss of metal when cutting threads on profiled end sections due to fluctuations in the external diameter of the pipes after they are rolled.

There is also known a method of processing and controlling pipes, in which thermal processing of the original pipe is carried out, calibration of coupling and bezmuftovogo ends

pipes on the outer diameter, profiling the pipe ends on a cone, threading, control of the internal diameter of pipes, installation of the coupling, control of the coupling, sealed, control of the pipe length, marking, varnish coating and substance 2.

The disadvantage of the known method is that the processing of both ends of pipes on closely located installations with significant removal of other installations (muffing machine, press for conducting hydraulic tests) leads to nicks on the thread during transportation of the pipes along the roller table and, as a result, to additional rerun and re

15 processing the end of the pipe.

The aim of the invention is to improve the quality.

The goal is achieved by the fact that, according to the method of processing and control of pipes, in which heat treatment of the pipe is performed, calibration of the coupling and non-coupling ends of the pipe with respect to the outer diameter, profiling of the pipe ends into a cone, non-tampering, inspection of the internal diameter of the pipes, installation of the coupling, control of the coupling connection for tightness, control of the length of the pipe, marking, varnishing and drying, control of the internal diameter of the pipe are carried out after calibration of the coupling and sleeveless pipe ends, and The pipe ends are tapering and threading in two stages; at the first stage, the coupling end of the pipe is profiled and threaded; and at the second stage, the end of the pipe is profiled and threaded, and the coupling is installed and the coupling is monitored tightness is carried out between the above steps of profiling and threading. The drawing shows a flow-mechanized line processing and control of pipelines of oil pipelines. The flow-mechanized line includes a press 1 for calibrating pipe ends, an installation 2 for pipe gauging along its entire length, a transfer grid 3, a pipe-cutting machine 4, an installation 5 for tapping the couplings, a press 6 for controlling pipe hydraulic pressure, a pipe-cutting machine 7, an installation 8 for applying lubrication and screwing on safety rings, installation 9 for applying lubrication and screwing the nipple into the pipe {1 unit, installation 10 for measuring the length of pipes, installation 11 for single weighing pipes, installation 12 for branding, installation 3 for outside painting and conveyor 14 for drying pipes interconnected by a conveyor conveyor 15. The proposed method includes the following basic operations; calibrating the pipe ends by the outer diameter, monitoring the internal diameter of the pipe along its entire length (patterning), processing the coupling end of the pipe, consisting in profiling the end of the pipe at the end and cutting on it, screwing the sleeve onto the machined end of the pipe, monitoring the pipe with hydraulic pressure, machining the pipe bezofuft end, which consists in profiling the end into a cone and cutting threads on it, screwing a safety ring onto a pre-lubricated bezmuftovy end, screwing in a prefix ceiling elements in lubricated sleeve, the length and weight control, marking, painting and subsequent drying tubes. The proposed method is carried out as follows. The processing of pipes on a flow-mechanized line begins with the operation of the calibration of the ends, which is caused by the high demands placed on the quality of the threaded connection of the casing. Calibration of the pipe end is carried out on the press in two stages. In the first stage, the end portion of the punch is distributed to the magnitude of about P / o FROM the outer diameter, i.e., 2.73-3 mm. Then in the second stage align the pipe to the outer diameter due to the calibration ring (matrix). After both ends are calibrated, each pipe undergoes patterning, which consists in controlling the internal diameter of the pipe along its entire length with a special template, the dimensions of which are stipulated by GOST 632- 64. At the same time, the outer (working) diameter of the template is С1ш d- (3-5 mm) and for pipe size 273 mm d, 248 mm. The implementation of pipe gauging before subsequent operations allows for the timely rejection of pipes with deviations in internal diameter, which increases the capacity of the line. After each pipe has been patterned, the end section of the pipe is machined, namely, profiling it at the end with a turning and threading. The parameters of the threaded end section of the pipe are determined by the requirements of GOST 632-64 and are 1 ° 4724 - the angle of inclination of the end section after turning at the end. The taper is 1:16. The length of the profiled end section of the pipe L 89 mm. Thread pitch S 3,175 .mm. Depth of carving is h 1,810 mm. After cutting, the thread at the end of the pipe is passed to the next machine, where lubrication and coupling coupling are carried out. Then the pipe is passed to the next group of machines entering the prtochno-mechanized line. At the same time, in the process of transferring pipes to the collar, their quality does not deteriorate, since the threaded end is protected by a coupling, and the second is not yet processed. This eliminates the failure of pipes at the nicks and increases the yield, which corresponds to an increase in line productivity by 5%. Next, the pipe is transferred to a hydraulic press, where they control the strength of the pipes by the pressure of the fluid supplied to the pipe cavity. The test pressure is regulated by GOST 632-64 and for the 273X X 10 mm pipe, the strength group E is P 240 kgf / cm. When testing a pipe on a press, its reliability increases as a result of the need to seal the second, untreated pipe end. Then, the processing of the second - ductless pipe end, similar to the processing of the socket end, is carried out, i.e., the end section is profiled at the end and the threads are cut. Immediately after processing the ductless end of the pipe, a pre-lubricated safety ring is screwed onto it, a safety nipple is screwed into the sleeve, the length control is controlled, the pressure is applied.

branding. The final step is painting the pipes, followed by drying.

Estimated volume of production of pipes on the line when using the current scheme 53.tys. t per year.

When using the proposed scheme due to an increase in the yield of suitable volume, the production of suitable pipes will increase to 56 thousand tons per year. Wholesale price of 1 ton of casing pipes OTTM 286 p. Save on increasing the yield will be (56000- -53000) X 286 - 3000 X 18 704000 p. / Year, where 18 p. - price of 1 ton of trimming.

Claims (2)

Invention Formula A method of manufacturing connecting pipes, in which heat treatment of the original pipe is performed, calibration of the coupling and ductless ends of the pipe with respect to the outer diameter, profiling of the ends of the pipe into a cone, threading, control of the internal diameter of the pipes, installation of the coupling, control of the coupling leak tightness, pipe length control, marking, varnishing and drying, characterized in that, in order to improve quality, the internal pipe diameter control is carried out after calibration of the coupling and bezmuftovogo pipe ends, and the profiling of the pipe ends on the cone and threading is carried out in two stages, in the first of which the coupling end of the pipe is profiled and threaded, and in the second - profiling the pipe-free end of the pipe and threading on it, the coupling being installed and the leak-proof coupling checked between the profiling steps and threading. Sources of information taken into account during the examination 1. F. A. Danilov. Dr. Hot rolling and pressing of pipes. M., "Metallurgist" I, 1972. 2. "Pipe processing processes, m .. “Metallurgists, 1976, (USSR Academy of Medical Sciences), Sat. L 1 s. 75, fig. 1 (prototype). / J