Vacuum diffusion welding process for groove type cylindrical surface connecting piece

A vacuum diffusion welding furnace and welding process technology, applied in welding equipment, manufacturing tools, non-electric welding equipment and other directions, can solve the problems of pressure application, long welding heat cycle time, etc., achieve good quality, overcome radial inability to apply pressure, The effect of improving production efficiency

Inactive Publication Date: 2015-01-21
CAPITAL AEROSPACE MACHINERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the requirements for the treatment and assembly of the parts to be welded are relatively high, special vacuum welding equipment is required, external pressure needs to be applied by means of machinery or gas, and the welding heat cycle time is long
When the part structure is a grooved cylindrical connection, since the ribs and the jacket are radially connected, the traditional method cannot exert pressure on the two, which has become an important factor restricting the application of vacuum diffusion welding.

Method used

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  • Vacuum diffusion welding process for groove type cylindrical surface connecting piece
  • Vacuum diffusion welding process for groove type cylindrical surface connecting piece
  • Vacuum diffusion welding process for groove type cylindrical surface connecting piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Process T4 copper inner core and jacket:

[0028] i. Process twenty ribs 2 with a width of 1 mm on a T4 copper inner core 1 with a diameter of Φ18 and a length of 40 mm.

[0029] ii. The copper jacket 3 is processed into Φ22×Φ18 to ensure an interference fit between the two, and the surface roughness of the mating surface of the inner core 1 and the jacket 3 is Ra0.8.

[0030] 2) Make pressure applying tooling:

[0031] i. Use tungsten to make tooling 4.

[0032] ii. Process four Φ22×40mm (height) holes 5 on the tooling, and the matching gap between the holes 5 and the nozzle jacket 3 should be as small as possible.

[0033] 3) Inner core and jacket vacuum diffusion welding

[0034] Put the nozzle into tooling 4, put it into a vacuum diffusion welding furnace for welding, the welding temperature is 800°C, and the holding time is 120min.

[0035] 4) Post-weld processing

[0036] After the welding is completed, the outer surface of the vacuum diffusion welding noz...

Embodiment 2

[0038] 1) Process oxygen-free copper inner core and jacket

[0039] i. Process twenty-two ribs 2 with a width of 0.8 mm and a depth of 1 mm on an oxygen-free copper inner core 1 with a diameter of Φ22 and a length of 50 mm.

[0040] ii. Oxygen-free copper jacket 3 is processed into Φ25×Φ22, and the connection surface of inner core 1 and jacket 3 is processed at an angle of 1° to ensure interference fit between the two; the surface roughness of the mating surface of inner core and jacket is Ra1.6.

[0041] 2) Make pressure applying tooling

[0042] i. Use graphite to make tooling 4.

[0043] ii. Process five Φ25×50mm (height) holes 5 on the tooling, and the matching gap between the holes 5 and the nozzle jacket should be as small as possible.

[0044] 3) Vacuum diffusion welding of nozzle inner core and jacket

[0045] i. Before welding, the welding surface of the inner core and the outer jacket is plated with active agent.

[0046] ii. Put the nozzle into tooling 4, put it...

Embodiment 3

[0048] 1) Processing copper alloy inner core and jacket

[0049] i. Process twenty-two ribs 2 with a width of 0.8 mm and a depth of 1 mm on a copper alloy inner core 1 with a diameter of Φ18 and a length of 50 mm.

[0050] ii. Copper alloy jacket 3 is processed to Φ22×Φ18, and the connection surface processing angle of inner core 1 and jacket 3 is 0.6° to ensure interference fit between the two; the surface roughness of the mating surface of inner core and jacket is Ra1.6.

[0051] 2) Make pressure applying tooling

[0052] i. Use graphite to make tooling 4.

[0053] ii. Process five Φ22×50mm (height) holes 5 on the tooling, and the matching gap between the holes 5 and the nozzle jacket should be as small as possible.

[0054] 3) Vacuum diffusion welding of nozzle inner core and jacket

[0055] Put the nozzle into tooling 4, put it into a vacuum diffusion welding furnace for welding, the welding temperature is 850°C, and the holding time is 120min.

[0056] 4) Post-weld pr...

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Abstract

The invention relates to a vacuum diffusion welding process for a groove type cylindrical surface connecting piece. The process includes the following steps that firstly, an inner core and a jacket are machined; secondly, a pressure applying tool is manufactured; thirdly, the machined inner core and the machined jacket are arranged in the tool, and vacuum diffusion welding is conducted. The first step includes the procedures that multiple ribs with the width being about 1 mm are machined on the inner core; the jacket and the inner core are machined in an interference fit mode, wherein the surface roughness of the fitting surfaces is over Ra1.6. The second step includes the procedures that the tool is made of materials with the small thermal expansion coefficient, and one or more holes are machined in the tool according to the external diameter of the jacket. The third step includes the procedures that a heating system is started, the connecting piece is heated to 800 DEG C to 950 DEG C along with furnace temperature, and heat is preserved for 60 min to 120 min. According to the welding process, the diffusion flow is simplified, the quality of a welded joint is improved, a groove passage is free of blockage, volume production can be achieved, and the good economic effect is achieved.

Description

technical field [0001] The invention relates to the field of welding, in particular to the field of vacuum diffusion welding technology for grooved cylindrical connectors. Background technique [0002] With the in-depth development of science and technology, the performance parameters of structural parts in the field of aerospace are becoming more and more stringent, and higher requirements are also put forward for its processing technology, especially the low strength of welded joints of structural parts is not expected to affect performance of the part. Taking the rocket engine as an example, in order to further increase the thrust and suppress the combustion oscillation, the nozzle often adopts a grooved cylindrical connection structure. This structure usually includes a cylindrical inner core, a cylindrical jacket that matches the inner core, multiple grooves on the outer wall of the inner core in the radial direction, and multiple ribs formed between adjacent grooves, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/00B23K20/14
CPCB23K20/001B23K20/14B23K20/24
Inventor 张丽娜赵衍华张益坤唐林峰黑增民朱瑞烂朱平萍刘敏袁德海
Owner CAPITAL AEROSPACE MACHINERY
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