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Two-step push type external expander of large-caliber seamless steel pipe and thermal expanding process for two-step push type external expander

A seamless steel pipe and large-diameter technology, applied in the field of stainless steel manufacturing, can solve the problems of serious environmental pollution, large loss of tools and molds, and many production processes, so as to achieve refined microstructure, increase the rate of finished products and qualifications, and reduce the time for changing specifications short effect

Inactive Publication Date: 2017-07-04
浙江卓业能源装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Large-diameter stainless steel seamless steel pipes are generally produced by several processes such as hot rolling, cold rolling, and cold drawing. , and cold rolling and cold drawing must be pickled, causing serious environmental pollution

Method used

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  • Two-step push type external expander of large-caliber seamless steel pipe and thermal expanding process for two-step push type external expander
  • Two-step push type external expander of large-caliber seamless steel pipe and thermal expanding process for two-step push type external expander
  • Two-step push type external expander of large-caliber seamless steel pipe and thermal expanding process for two-step push type external expander

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Effect test

Embodiment 1

[0033] The present invention provides a two-step push-type thermal expansion machine for large-diameter seamless steel pipes, which includes a base 1 and a pull rod. A steel pipe to be pushed is provided over one end of the pull rod, and a pushing mandrel is provided at the other end of the pull rod. The base 1 is provided with The entrance roller table 13 for conveying steel pipes is provided with a hydraulic lifting gate 3 that can be lifted vertically. The hydraulic lifting gate 3 can be lowered to tighten and push the steel pipes to be horizontally transported to the intermediate frequency induction coil 9 .

[0034] The above-mentioned base 1 is provided with a main oil cylinder 2 for driving the above-mentioned lifting gate to move horizontally.

[0035] A movable push plate trolley 6 and a track 5 for driving steel pipes are also arranged between the inlet end of the intermediate frequency induction coil 9 and the main oil cylinder 2 .

[0036] The outlet end of the int...

Embodiment 2

[0043] The two-step push-type thermal expansion process for large-diameter seamless steel pipes is characterized in that the above-mentioned process steps are as follows:

[0044] The first step is to apply high temperature resistant lubricant evenly on the inner surface of the stainless steel pipe to be pushed;

[0045] The second step is to push the deformed section of the mandrel to be preheated in the intermediate frequency induction coil 9;

[0046] In the third step, after feeding and alignment, the stainless steel pipe to be pushed moves forward through the entrance roller table 13, and the stainless steel pipe to be pushed is inserted into the pull rod, and the main oil cylinder 2 advances to push the steel pipe through the hydraulic lift The ram 3 and the hydraulic lifting ram 3 descend against the steel pipe, and the main cylinder 2 continues to move forward, pushing the steel pipe on the pull rod to move in the direction of the intermediate frequency induction coil ...

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Abstract

The invention discloses a two-step push type external expander of a large-caliber seamless steel pipe. The two-step push type external expander comprises a base and a drawbar, wherein a to-be-pushed steel tube sleeves outside one end of the drawbar; the other end of the drawbar is equipped with a pushing core rod; a feeding roller path for conveying the steel tube is arranged on the base; a hydraulic lifting gate plate capable of vertically lifting is arranged on the feeding roller path; and the hydraulic lifting gate plate can descend, jack and push the steel tube to horizontally convey to a medium-frequency induction heating coil. According to the two-step push type external expander disclosed by the invention, length of a hydraulic cylinder can be reduced nearly a half through two-step push, so that equipment manufacturing cost is reduced, length limitation of oil cylinder processing is solved from the process, raw materials are be quickly and uniformly heated in a controllable mode by the medium-frequency heating equipment, the raw materials can be pushed and deformed at constant speed, and performance uniformity of the tube body can be guaranteed. According to the thermal expander and the process thereof, the investment is less, the equipment is simple, the construction period is short, the product quality is good, the geometric accuracy is high, the yield is high, the energy consumption is low, and pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of stainless steel manufacturing, in particular to a two-step push type thermal expansion machine for large-diameter seamless steel pipes. Background technique [0002] Large-diameter stainless steel seamless steel pipes are widely used in petrochemical, nuclear power, thermal power, boiler, transportation and other industries, and are one of the important raw materials in the construction of the national economy. Therefore, the production and development of large-diameter stainless steel seamless steel pipes have been valued and supported by countries all over the world , At the same time, the production equipment of large-diameter stainless steel seamless steel pipes has also been greatly developed. [0003] Large-diameter stainless steel seamless steel pipes are generally produced by several processes such as hot rolling, cold rolling, and cold drawing. , and cold rolling and cold drawing must be pickled...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D39/20B21D37/16B21D43/02B21D37/18
CPCB21D39/20B21D37/16B21D37/18B21D43/006B21D43/02
Inventor 林日和李雍贵李晓华郑世建
Owner 浙江卓业能源装备有限公司
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