Novel process for manufacturing retained mandrel for continuous rolling of steel pipe

A technology for restricting mandrels and new processes, applied in manufacturing tools, other manufacturing equipment/tools, metal rolling, etc., can solve the problems of low yield of mandrel blanks, complicated manufacturing processes, and long manufacturing cycles, etc. To achieve the effect of reducing the difficulty of processing and manufacturing, improving the effective operation rate and improving the production efficiency

Inactive Publication Date: 2006-10-04
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0017] Therefore, the purpose of the present invention is to provide a new manufacturing process of steel pipe continuous rolling stop mandrel, which adopts new manufacturing process steps and adjusts processing equipment, so as to solve the problem of complicated manufacturing process, difficult processing, and short manufacturing cycle of the existing manufacturing process. Long, low yield of mandrel blanks

Method used

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  • Novel process for manufacturing retained mandrel for continuous rolling of steel pipe
  • Novel process for manufacturing retained mandrel for continuous rolling of steel pipe
  • Novel process for manufacturing retained mandrel for continuous rolling of steel pipe

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Embodiment Construction

[0038] In order to help understand the present invention, typical embodiments of the present invention will be described in detail below in conjunction with related drawings.

[0039] See image 3 , the process flow of a typical embodiment of the present invention is: forging blank → complete annealing → thermal straightening → adopting cyclone lathe to carry out rough / semi-finishing → dual frequency quenching → (secondary) high temperature tempering → abrasive belt grinding → chrome plating → Dehydrogenation.

[0040] The first step is to obtain forging / rolling blanks. For the sake of economy, unless it is a mandrel with a large outer diameter, forging billets are used because the forging ratio / rolling ratio cannot be satisfied, and rough rolling billets with better straightness, small ellipticity and better appearance quality should be used as much as possible. In this embodiment, a cast steel ingot of 10.8 tons is used, and a Ф183mm×20m mandrel blank is obtained after rough...

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Abstract

The invention discloses a steel pipe tandem rolling restraint mandril preparing method, which comprises the following steps: forging / rolling blank; annealing outright; hot straightening; rough / semi-finish; heat hardening; (twice) high tempering; grinding belt; chrome plating; dehydrogenating. The invention reduces the material cost, which improves the blank yield.

Description

technical field [0001] The invention relates to a new manufacturing process of a seamless steel pipe rolling tool in the metallurgical industry, in particular to a new manufacturing process of a stop mandrel for continuous rolling of steel pipes. Background technique [0002] With the sharp increase in demand for steel brought about by the rapid development of my country's national economy, my country's steel production has leapt to the first place in the world, but the domestic production of stop mandrels for seamless steel pipe rolling is far from being able to meet domestic demands. The demand of the market has been largely dependent on imports, and the country spends a lot of foreign exchange every year for this, which seriously restricts the pace of development of my country's steel industry. Therefore, it is urgent to develop a new steel pipe continuous rolling stop mandrel manufacturing process. [0003] The production process of the existing limited mandrel processing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P23/04B21B25/00
Inventor 赖兴涛朴承善
Owner BAOSHAN IRON & STEEL CO LTD
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