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High pressure liquid lubrication drawing tail end sealing method

A technology of end sealing and high-pressure liquid, which is applied in the direction of engine sealing, engine components, mechanical equipment, etc., can solve problems such as drawing oil ejection, lower production efficiency, and safety accidents, so as to reduce costs, improve production efficiency, The effect of reducing waste

Inactive Publication Date: 2015-04-08
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also because it is not easy to judge whether the pipe is close to the end position accurately, if the stop is early, the waste of pipe will increase, and if the stop is late, the drawing oil will be sprayed out, and safety accidents may occur.
In addition, due to the pause in the drawing process, the production efficiency is also reduced

Method used

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  • High pressure liquid lubrication drawing tail end sealing method
  • High pressure liquid lubrication drawing tail end sealing method
  • High pressure liquid lubrication drawing tail end sealing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] exist figure 1 In the schematic cross-sectional view of the drawing part of the high-pressure liquid lubrication drawing machine shown, the high-pressure cylinder 9, the sealing cylinder 6, the sealing ring 5, the drawing outer mold 3, the blank tube 11 and the drawing inner mold 7 form a closed space, The inside is full of high-pressure drawing oil 10 for drawing lubrication. The drawing outer mold is fixed in the mold seat 2. Take 304 stainless steel pipe, specification ?30x2, tensile strength 520MPa. Through calculation, the required drawing force for normal drawing is 5630kg. Before drawing, use a lathe to process a circular groove 12 with a depth of 1mm and a U-shaped cross section at about 20mm at the end of the blank tube, such as figure 2 As shown, the remaining wall thickness of the blank tube at the annular groove is 1mm, and it can withstand a tensile force of 4410kg according to the tensile strength of 520MPa.

[0017] When drawing, when the finished tub...

Embodiment 2

[0019] The high-pressure cylinder, sealing cylinder, sealing ring, drawing outer mold, blank tube and drawing inner mold of the drawing machine form a closed space, which is filled with high-pressure drawing oil for drawing lubrication. The drawing outer mold is fixed in the mold seat. Take T22 heat exchange tube, specification ?25x1.5, tensile strength 415MPa. Through calculation, the required drawing force for normal drawing is 2490kg. Before drawing, use a hob to process a circular groove 13 with a depth of 1mm and a V-shaped cross section at about 20mm from the end of the blank tube, such as image 3 shown. In this way, the remaining wall thickness of the rough tube at the annular groove is 0.5 mm, and it can withstand a tensile force of 1467 kg according to the tensile strength of 415 MPa.

[0020] During drawing, when the finished tube is pulled out until the end of the blank tube passes through the annular groove, the blank tube will be broken at the annular groove, a...

Embodiment 3

[0022] The high-pressure cylinder, sealing cylinder, sealing ring, drawing outer mold, blank tube and drawing inner mold of the drawing machine form a closed space, which is filled with high-pressure drawing oil for drawing lubrication. The drawing outer mold is fixed in the mold seat. Take T22 heat exchange tube, specification ?25x1.5, tensile strength 415MPa. Before drawing, connect a short tube 15 with a length of about 20mm and the same material specification at the end of the blank tube by welding, such as Figure 4 shown. Through calculation, the drawing force required for the normal drawing of the short pipe is 2490kg, the depth of the weld 14 is about 0.5mm, and it can bear about 1597kg of pulling force based on the tensile strength of 415MPa.

[0023] When drawing, when the finished tube is pulled out until the end of the blank tube passes through the weld, the blank tube will be broken at the weld, and a section of residual tube will remain at the die opening. Thi...

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Abstract

The invention discloses a high pressure liquid lubrication drawing tail end sealing method. The sealing method comprises the steps of setting an annular groove in a position close to the tail of a blank pipe before drawing, and determining the depth of the annular groove when the tensile force capable of being born by the surplus wall thickness of the blank pipe of the annular groove is less than the normal drawing force required for drawing; or connecting a short pipe the diameter of which is same as that of the blank pipe on a position close to the blank pipe before drawing, and determining the connecting strength of a joint when the tensile force capable of being born by the joint is less than the normal drawing force required for drawing; and when the short pipe which is taken as a finished pipe is pulled to the tail of the blank pipe in a drawing process, filling a section of residual pipe formed in a way that the blank pipe is pulled cut in the annular groove or at the joint with the other short pipe into a gap between a drawing outer die and a drawing inner die, and sealing. The high pressure liquid lubrication drawing tail end sealing method provided by the invention has the advantages that the sealing is reliable and easy to realize, the residual pipe is a short blank pipe, the waste is reduced, cost is reduced, the pause is not needed in the drawing manner, and the production efficiency is improved.

Description

technical field [0001] The invention relates to a pipe drawing machine, in particular to a sealing method for pipe drawing. Background technique [0002] At present, the drawing machine lubricated by high-pressure liquid, during the drawing process, the blank tube is always immersed in the high-pressure drawing oil, and the high-pressure cylinder, sealing cylinder, sealing ring, drawing outer mold, blank tube and drawing inner mold form a The closed space is filled with high-pressure drawing oil for drawing lubrication. At the moment when the finished pipe is completely pulled out, the seal is broken, and the high-pressure drawing oil will be ejected from the gap between the drawing outer die and the drawing inner die. In order to avoid this situation, it is necessary to stop the drawing when the drawing is close to the end, and then pull out the remaining pipe after releasing the pressure of the drawing oil. However, because the drawing pause will cause quality problems, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C1/16F16J15/08
Inventor 刘庆国
Owner YANSHAN UNIV