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Method for machining metal pipe with tapered elbow

A technology of metal pipes and processing methods, which is applied in the field of material processing, can solve the problems that it is difficult to meet the requirements of metal strength, plasticity and other performance requirements for reducing wall thickness, cannot meet the requirements of parts taper, and cannot use bending methods, etc., to achieve Low cost, good performance, bright surface effect

Inactive Publication Date: 2016-03-30
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of part is difficult to form by ordinary pipe bending technology, especially it cannot meet the requirements for the taper of the part
Because the ordinary bending process is to bend the pipe in a plane, the bending mold is placed perpendicular to the plane direction of the part, the part is bent around the mold, the bending force is parallel to the plane direction of the part, and the bending with a taper requires an upward or downward direction. The lower force, so the ordinary bending method can not be used
However, other manufacturing technologies such as casting technology are difficult to meet the requirements of reducing wall thickness and the requirements for metal strength and plasticity of parts; complete machining technology consumes a lot of time and causes a lot of material waste

Method used

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  • Method for machining metal pipe with tapered elbow

Examples

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Effect test

Embodiment 1

[0023] Using 304 stainless steel pipes with a cross-sectional major axis of 65 mm, a cross-sectional minor axis of 38 mm, and a wall thickness of 2 mm, a ring with a finished ring diameter of 800 mm and a cross-sectional inclination angle of 15° is made. Use a flexible mold to process pipes using a turntable stretch bending process. The specific operation steps are as follows:

[0024] l) Draw a 304 stainless steel round tube with a diameter of 57 mm and a wall thickness of 2 mm to obtain a tube with a cross-section major axis of 65 mm, a cross-section minor axis of 38 mm, and a wall thickness of 2 mm, with a length of 1656 mm; , cleaning the prepared pipe for later use;

[0025] 2) Inject melted paraffin into the pipe, seal both ends tightly, and set aside;

[0026] 3) Turntable stretch bending processing; the stretch bending mold adopts a flexible mold, the mold groove is consistent with the shape of the pipe section, the shape inclination angle is 15°, the thickness of eac...

Embodiment 2

[0032] A circular ring with a ring diameter of 600 mm and a cross-sectional inclination angle of 5° is made by using a brass material with a blank section length of 55 mm, a blank section width of 38 mm, and a wall thickness of 1.5 mm. Use a flexible mold to process pipes using a turntable stretch bending process. The specific operation steps are as follows:

[0033] l) Select a soft metal tube with a section length of 55mm, a section width of 38mm, a wall thickness of 1.5mm, and a length of 1342mm, and clean it for later use;

[0034] 2) Inject melted rosin into the pipe, seal both ends tightly, and set aside.

[0035] 3) Perform turntable stretch bending processing. The stretch bending mold adopts a flexible mold, the mold groove is consistent with the shape of the pipe section, the shape inclination angle is 5°, the thickness of each unit is 5mm, and the overall mold diameter is 540mm. The blank steel pipe is embedded in the mold, and then the mold and the steel pipe are p...

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Abstract

The invention belongs to the field of material machining, particularly relating to a method for machining a metal pipe with a tapered elbow. The method is characterized by comprising the following specific steps: selecting a metal pipe of which the cross section shape and wall thickness meet requirements of the final cross section shape and wall thickness of a part as a blank pipe at first, wherein the metal pipe is not curved obviously; injecting molten filling materials in the blank pipe and then tightly sealing two ends of the blank pipe; carry out stretch bending and molding by using a rotary table; inserting the blank pipe in a mold and then integrally pressing the mold and the blank pipe on a mold base to carry out stretch bending; removing the filling materials in the product; correcting the inner diameter of the product subjected to stretch bending on a prepared standard fixture; carrying out welding molding on a prefabricated welding fixture; and finally integrally correcting the obtained workpiece. The method is simple in production technology, low in cost and high in yield; the overall machined alloy pipe has relatively high strength and plasticity, has a bright surface, is good in using performance, and is suitable for being used in situations with relatively high requirements on integral performance of pipes.

Description

[0001] Patent field [0002] The invention belongs to the field of material processing, and in particular relates to a processing method for tapered bending of metal pipes. Background technique [0003] In order to optimize the design, in some mechanical equipment, it is necessary to select the circumferential extension of some metal tubular parts with special-shaped cross-sections with a certain spatial shape to meet the assembly requirements. Such parts often have some special shapes and irregular spatial forms. For example, the cross-section is not round, square or rectangular, but oval or other special-shaped cross-sections; secondly, such parts often have special spatial forms. , For example, there is a certain taper on the whole, and the part is a rotary body as a whole, but the diameter of the upper end is smaller than the diameter of the lower end, and the overall shape is trumpet-shaped. This kind of part is difficult to form by ordinary pipe bending technology, espe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D9/00B21D9/15B23K9/16
CPCB21D9/00B21D9/15B23K9/16
Inventor 贺金宇李德富
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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