Vertical hot drawing technology for seamless cylinder

A vertical, hot-drawing technology, applied in the field of metal material processing, can solve the problems of poor surface quality of the workpiece, large difference in drawing wall thickness, increased manufacturing cost, etc. cost reduction effect

Inactive Publication Date: 2017-07-25
NANJING BANQIAO FIRE FIGHTING EQUIP
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Because the workpiece and the mold are in a horizontal state during drawing, the mold and the workpiece are strongly affected by gravity, and the cooling of the upper and lower surfaces of the mold is uneven, resulting in a large difference in the wall thickness of the drawing; In a horizontal state, the foreign matter on the inner wall of the workpiece and the upper surface of the mold is difficult to clean during the fast-paced hot drawing process, resulting in relatively poor surface quality of the workpiece and excessive wear of the mold, increasing manufacturing costs

Method used

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  • Vertical hot drawing technology for seamless cylinder

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specific Embodiment approach

[0023] see figure 1 As shown, a seamless gas cylinder vertical hot drawing process includes the following steps:

[0024] (1), vertical punching blind hole: use a vertical punching machine to punch out a bucket-shaped hot preform 2 from a square bar or a round bar heated to 1100-1200°C and placed along the central axis of the mold; The vertical punching machine includes a punching die upper die 1 and a punching die lower die 3 that cooperate with each other. The punching die lower die 3 is used to place the hot preform bar, and the punching die upper die 1 quickly moves down to punch the hot preform bar. Out of the barrel-shaped hot preform 2, the perforated upper mold 1 rapidly descends at a speed of 60-150mm / s.

[0025] (2) Purge the inner wall of the hot preform: after punching the blind hole, quickly take out the hot preform 2 from the punching machine mold with the manipulator 4 and turn it over 180° quickly, with the mouth of the hot preform facing down, A high-pressur...

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Abstract

The invention relates to a vertical hot drawing technology for a seamless cylinder. The vertical hot drawing technology for the seamless cylinder is a process that a drawing mold and a vertical drawing press are adopted for draw forming of a cylinder blank after vertical hot piercing. The vertical hot drawing technology has the following technological steps of heating a blank after vertical blanking of a blind hole, placing the hot cylinder blank reversely for blowing impurities, placing the hot cylinder blank in place for preparation for drawing, hot drawing, returning and discharging. The vertical hot drawing technology for the seamless cylinder can reduce the deviation of the wall thickness of a seamless cylinder body, improve the quality of the seamless cylinder, prolong the service life of a mold, and reduce cost.

Description

technical field [0001] The invention relates to the field of metal material processing, in particular to a vertical hot drawing process for seamless gas cylinders. Background technique [0002] There are three main forming processes for seamless gas cylinders: hot spinning of steel pipes, hot drawing of steel billets and stamping of steel plates. The steel pipe hot spinning process has its own defects in technology, and the advanced countries in the world are gradually eliminating this process; the cost of steel plate stamping has always been high due to low material utilization and environmental protection factors. The hot-drawing process for steel cylinders is currently the most common production process for seamless steel cylinders. At present, there is only one hot-drawing process for gas cylinders in the world: the horizontal hot-drawing process. Because the workpiece and the mold are in a horizontal state during drawing, the mold and workpiece are strongly affected by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D51/24B21D22/02B21D22/21
CPCB21D51/24B21D22/02B21D22/21
Inventor 李恒亮赵伦元
Owner NANJING BANQIAO FIRE FIGHTING EQUIP
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