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Diameter-variable nozzle stub throat process

A technology of short tube and necking, which is applied in the field of variable diameter short tube shrinking technology, can solve the problems of expensive mold cost, difficult quality assurance, low production efficiency, etc., and achieve the effect of fast processing and simple process

Inactive Publication Date: 2006-03-15
包头市迅达供暖设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is both labor-intensive and material-intensive, and a longitudinal weld is added at the interface, so the production efficiency is extremely low and the quality is difficult to guarantee.
[0003] In recent years, the heating method has also been used in China to shrink or expand short diameter pipes on pressure equipment with forming molds. However, one mold can only produce short pipes of one specification. Small reducer short tube, expensive mold and high production cost

Method used

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  • Diameter-variable nozzle stub throat process
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  • Diameter-variable nozzle stub throat process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1, using a three-axis rolling machine to process a short pipe with reduced diameter:

[0010] Refer to attached figure 1 The lining mold 3 adopts a garden cylinder with a groove in the middle of the outer wall, and the punch 2 adopts a garden cylinder with a circular protrusion in the middle of the inner wall. The punch 2 is set outside the lifting roller 4, and is driven by two active rollers. Hold the shaft 5, install the punch limit ring 7 on both ends of the punch 2 on the active roller 5, then set the lining mold 3 on the lifting roller 4, adjust the installation position of the lining mold 3, so that the lining mold 3 Align the centerline of the center line with the center line of the punch 2, install the liner limit ring 6 at both ends of the liner 3 on the lifting roller 4, and then set the pipe material 1 to be processed on the liner 3, and align center. At this time, start the roller bed lifting mechanism, make the lifting roller 4 slowly descend,...

Embodiment 2

[0011] Embodiment 2, using two-roller universal rolling machine to process variable-diameter short pipe:

[0012] Refer to attached image 3 , the lining mold 3 adopts a garden cylinder with grooves in the middle of the outer wall, the punch 2 adopts a circular punch, the punch 2 is set on the lifting roller 4, the lining mold 3 is set on the driving roller 5, and the The center line is aligned with the center line of the punch 2, and the pipe material 1 to be processed is set on the lining die 3 to find the center. At this time, start the roller bed lifting mechanism, make the lifting roller 4 slowly descend, press the pipe material 1, then start the roller bed, make the two driving rollers 5 rotate, and drive the lining mold 3, pipe material 1 and punch 2 to rotate , at the same time, the lifting roller 4 continues to descend slowly. At this time, after the tube material 1 is subjected to the strong radial rolling action of the circular protrusion of the punch 2, the pressu...

Embodiment 3

[0013] Embodiment 3, using a three-axis rolling machine to process a short pipe with reduced diameter:

[0014] Refer to attached Figure 4 , the lining mold 3 adopts a cylindrical shape, and the length of the lining mold 3 is less than the length of the pipe material 1 to be processed. The punch 2 adopts a garden cylinder with circular protrusions on the inner walls of both ends. Outside the roller 4, and supported by two active rollers 5, the lining mold 3 is set on the lifting roller 4, and the installation position of the lining mold 3 is adjusted so that the center line of the lining mold 3 and the center of the punch 2 Line alignment, and then set the pipe material 1 to be processed on the lining mold 3, and find the center. At this time, start the roller bed lifting mechanism, make the lifting roller 4 slowly descend, press the pipe material 1, then start the roller bed, make the two driving rollers 5 rotate, and drive the punch 2, the lining mold 3 and the pipe materi...

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PUM

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Abstract

A diameter reducing technology for the diameter-varying short pipe is disclosed. A set of male die and liner die is installed to universal or three-axle rolling machine. Said male die is a ring die or a pipe with one or two convex rings on its inner surface. Said liner die is a pipe with slot on its outer surface and is installed to the active rolling axle or lift rolling axle. The work-piece sleeves on said liner die. Said male die sleeves on lift rolling axle or the work-piece and is supported by two active rolling axles. After the lift-rolling axle is slowly lowering to make the male die press on the work-piece and the rolling machine is started, the work-piece is driven to rotate while the lift rolling axle is slowly lowering until two ends of work-piece are reduced. The work-piece is divided into two to obtain two diameter-varying short pipes.

Description

technical field [0001] The invention relates to a necking process of short tubes with variable diameters. Background technique [0002] Usually, the short reducing tubes used for the connection of the reducing part of the pipeline are bent and formed after adopting the traditional sheet metal unfolding and blanking method. This method is both labor-intensive and material-intensive, and a longitudinal weld is added at the interface, so the production efficiency is extremely low and the quality is difficult to guarantee. [0003] In recent years, the heating method has also been used in China to shrink or expand short diameter pipes on pressure equipment with forming molds. However, one mold can only produce short pipes of one specification. For small reducing pipes, the mold cost is expensive and the production cost is extremely high. Contents of the invention [0004] The purpose of the present invention is to...

Claims

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Application Information

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IPC IPC(8): B21D41/04B21D37/10
Inventor 赵铎
Owner 包头市迅达供暖设备有限公司
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