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 h

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

Example Embodiment

[0009] Example 1, using a three-axis rolling machine to process a reduced diameter short tube:

[0010] Reference attached figure 1 The lining mold 3 adopts a cylinder with a groove in the middle of the outer wall, and the punch 2 adopts a cylinder with a circular protrusion in the middle of the inner wall. The punch 2 is sleeved outside the lifting roller 4 and is rolled by two active rollers. The shaft 5 is supported, and the punch stop ring 7 is installed on both ends of the punch 2 on the driving roller 5, and then the lining mold 3 is sleeved on the lifting roller 4, and the installation position of the lining mold 3 is adjusted to make the lining mold 3 Align the center line of the lining mold with the center line of the punch 2, install the lining mold limit ring 6 on the two ends of the lining mold 3 on the lifting roller 4, and then put the pipe material 1 to be processed on the lining mold 3, and locate it accurately center. At this time, start the rolling bed lifting m...

Example Embodiment

[0011] Example 2, using a two-roll universal rolling machine to process a reduced diameter short tube:

[0012] Reference attached image 3 , The lining mold 3 is a cylinder with a groove in the middle of the outer wall, and the punch 2 is a circular punch. The punch 2 is sleeved on the lifting roller 4, and the lining mold 3 is sleeved on the driving roller 5. The center line is aligned with the center line of the punch 2, and the pipe material 1 to be processed is placed on the lining mold 3 to locate the center. At this time, start the rolling bed lifting mechanism to slowly lower the lifting roller 4 to compress the tube material 1, and then start the rolling bed to rotate the two active rollers 5, driving the liner mold 3, the tube material 1 and the 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 annular protrusion of the punch 2, the compress...

Example Embodiment

[0013] Example 3, using a three-axis rolling machine to process reduced diameter short pipes:

[0014] Reference attached Figure 4 , The lining mold 3 adopts a cylindrical shape, the length of the lining mold 3 is less than the length of the pipe material 1 to be processed, and the punch 2 adopts a cylindrical tube with annular protrusions on the inner walls of both ends, and the punch 2 is set in the lift Outside the roller 4 and supported by the two active rollers 5, sleeve the liner mold 3 on the lifting roller 4, adjust the installation position of the liner mold 3, and make the center line of the liner mold 3 and the center of the punch 2 Align the lines, then put the pipe material 1 to be processed on the lining mold 3, and locate the center. At this time, start the rolling bed lifting mechanism to slowly lower the lifting roller 4 to compress the pipe material 1, and then start the rolling bed to rotate the two active rollers 5, driving the punch 2, the liner mold 3 and th...

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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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