Coreless pipe-bending machine

Abstract

The invention discloses a coreless pipe-blending machine in the field of pipe processing equipment. The coreless pipe-blending machine is provided with a hydraulic push plate, a pipe bending device and an inductive heating ring, wherein the hydraulic push plate is fixedly arranged on a base and is fixedly provided with a rear clamp; a pipe blank guide holder is further arranged on the base; the pipe blank guide holder is provided with at least one pair of guide rolls; the pipe bending device comprises a rotary force arm shaft arranged on a rotary force arm base; a rotary force arm clamp is sleeved on the rotary force arm shaft; a rotary force arm pull rod is clamped on the rotary force arm clamp; a front clamp is fixedly arranged at the end part of the rotary force arm pull rod; and the inside angle, which is back on to the rack, of the inductive heating ring is provided with a plurality of water spray holes. According to the coreless pipe-bending machine, water spray cooling and sizing are carried out on a bent pipe which is heated to be bent, and the bent section of a pipe blank is controlled at a position through which the pipe blank gets out of the inductive heating ring, the stress concentration of the bent section is ensured, the processing precision of the bent pipe is improved, the percent of pass of the bent pipe is improved, and the coreless pipe-bending machine can be used for precision machining of the bent pipes.

Description

technical field [0001] The invention relates to a pipe fitting processing equipment, in particular to a pipe bending machine. Background technique [0002] Elbows are one of the important components of oil and gas pipelines, and long-distance pipelines require a large number of elbows. Elbows are also one of the more demanding structural parts in pipelines. In the pipelines that have been built and operated, the pipeline failure accidents related to pipe bends account for a relatively high proportion of the entire pipeline accidents, and the comprehensive quality of pipe bends is one of the bottlenecks restricting the safe and stable operation of pipelines. [0003] The induction heating elbow production technology fully utilizes the characteristics of induction heating, which has the characteristics of rapid heating, narrow heating band, and fast cooling. Compared with other methods, the induction heating elbow method has many advantages such as small ellipticity, minimum ...

AI Technical Summary

Problems solved by technology

[0005] Its shortcoming is that in the process of rotating and deforming the tube blank heated by the induction heating ring around the main shaft, the heated tube blank cannot be cooled in time, and the stress distribution in the bending process is uneven, so that the uniformity of the tube cannot be guaranteed. Bending, once there is a large local bending deformation, the strength of this position will drop rapidly, resulting in local collapse and deformation of this position during the bending process, which will seriously affect the qualification rate of the pipe fittings, and this device is due to the distance from the rotating shaft to the chuck Fixed, which makes the bending arc relatively fixed when producing elbows. If you need to process elbows with different arcs, you need to replace the rotating arms of different sizes, which increases the production cost.

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