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Hole-enlarging deforming device and method for metal pipe fitting

A technology of metal pipe fittings and deformation devices, applied in metal processing equipment, forming tools, manufacturing tools, etc., can solve problems affecting the dimensional accuracy of metal pipe fittings, scratches on metal pipe fittings, easy damage to molds, etc., and improve the quality of the inner surface , Avoid direct friction, reduce wear effect

Inactive Publication Date: 2016-05-18
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing diameter expansion method, the expansion mold 2 and the metal pipe fitting 3 will generate a large friction force during the diameter expansion process, which may easily cause scratches on the inner surface of the metal pipe fitting, and the surface quality is low. In addition, the large friction force leads to Diameter expansion is hindered, which affects the dimensional accuracy of metal pipe fittings 3 after diameter expansion
Molds are susceptible to damage due to friction

Method used

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  • Hole-enlarging deforming device and method for metal pipe fitting
  • Hole-enlarging deforming device and method for metal pipe fitting
  • Hole-enlarging deforming device and method for metal pipe fitting

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Effect test

Embodiment 1

[0023] Such as figure 2 As shown, it is a schematic diagram of a diameter-expanding deformation device for a metal pipe fitting of the present invention. Wherein 1 is the expansion support, 2 is the expansion die, 3 is the metal pipe fitting, and 4 is the elastic mold cover. The expanding die 2 is processed by GCr15 die steel, the hardness is greater than HRC55, and the size of the sizing band is 8.98mm. The metal pipe fitting 3 is a TA1 titanium alloy pipe with an inner diameter of 9.70mm and an outer diameter of 12.10mm. The elastic mold cover 4 is processed by 60Si2MnA steel with good elasticity and rigidity. The inner diameter of the elastic mold cover 4 is 8.70mm, and the outer diameter is 9.90mm. The upper and lower ends of the elastic mold cover 4 are processed with symmetrical non-penetrating concave There are 6 slots, and the slot width is 0.50mm.

[0024] The expansion deformation process of the TA1 titanium alloy pipe fitting of the present invention is as follo...

Embodiment 2

[0029] refer to figure 2 Diameter expansion deformation method of metal pipe fittings shown. The expanding die 2 is processed by Cr12MoV die steel, the hardness is greater than HRC55, and the size of the sizing band is 17.67mm. The metal pipe fitting 3 is a Ni47Ti44Nb9 memory alloy pipe with an inner diameter of 17.95mm and an outer diameter of 23.00mm. The elastic die set 4 is processed by 60Si2MnA steel. The inner diameter of the elastic die set 4 is 15.40mm, and the outer diameter is 18.55mm. The upper and lower ends of the elastic die set 4 are each processed with 5 symmetrical non-penetrating grooves, and the groove width is 0.50mm. .

[0030] The Ni47Ti44Nb9 memory alloy pipe fitting diameter expansion deformation process of the present invention is as follows:

[0031] (1) The radial diameter expansion deformation of the designed Ni47Ti44Nb9 memory alloy pipe fitting is 16% (inner diameter deformation).

[0032] (2) The elastic mold cover 4 is installed in the inne...

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Abstract

The invention relates to a hole-enlarging deforming device and method for a metal pipe fitting.The device comprises the metal pipe fitting, an expanding support and an expanding die and further comprises an elastic die sleeve placed in the metal pipe fitting. The internal diameter of the elastic die sleeve is in clearance fit with the external diameter of the expanding die. The method comprises following steps: firstly, installing the elastic die sleeve into the metal pipe fitting such that internal diameter of the elastic die sleeve is in clearance fit with the external diameter of the expanding die; secondly, installing the expanding support to a punch press and applying expanding pressure to the expanding die such that a calibrating strap penetrates through the elastic die sleeve and performs expanding operation, and taking down the metal pipe fitting after finishing the above steps. The method helps to avoid direct friction between the metal pipe fitting and the expanding die such that quality of an inner surface of the metal pipe fitting and size precision of the metal pipe fitting after expansion are improved. Therefore, abrasion of the expanding die is effectively reduced and durability of the expanding die is improved. The method can be extensively applied to expanding deforming of the metal pipe fitting, and process-molding of conical pipes for flow instruments in chemical and petroleum fields.

Description

technical field [0001] The invention relates to a diameter expansion deformation device and method of a metal pipe fitting, in particular to inserting an elastic mold sleeve inside the metal pipe fitting, so that the diameter expanding mold and the elastic mold sleeve may rub against each other during the diameter expansion process of the metal pipe fitting, so as to avoid the friction between the metal pipe fitting and the expansion mold. The direct friction of the diameter mold can effectively improve the inner surface quality of the metal pipe fitting and the diameter expansion device and method of the diameter expansion dimensional accuracy of the metal pipe fitting. Background technique [0002] Diameter expansion deformation of metal pipe fittings is a special cold plastic forming process. It refers to a deformation method that uses a conical mold to pass through the inner hole of the metal pipe fitting under pressure to expand the inner diameter and outer diameter of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D39/08B21D37/12
Inventor 李艳锋冯雪米绪军尹向前解浩峰高宝东
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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