CN107824932B

CN107824932B - Clamp for controlling brazing deformation of fuel header pipe

Info

Publication number: CN107824932B
Application number: CN201711145992.7A
Authority: CN
Inventors: 井启芳; 李洪波; 黄顺; 谭跃江; 徐吉福; 涂泉
Original assignee: AECC Guizhou Liyang Aviation Power Co Ltd
Current assignee: AECC Guizhou Liyang Aviation Power Co Ltd
Priority date: 2017-11-17
Filing date: 2017-11-17
Publication date: 2020-06-23
Anticipated expiration: 2037-11-17
Also published as: CN107824932A

Abstract

The invention discloses a fixture for controlling the brazing deformation of a fuel main pipe, which comprises a pressing unit positioned on the upper end surface of a nozzle and a supporting unit positioned on the lower end surface of the nozzle; the compaction unit comprises a stainless steel structural part (1) with a door-shaped cross section, and two vertical edges of the structural part (1) are equal in width but unequal in length; the supporting unit comprises a circular ring-shaped base body (2), observation ports (3) are arranged on the outer circumference of the circular ring-shaped base body (2) at equal intervals, and a supporting seat (4) is arranged between two adjacent observation ports (3) and on the upper end face of the circular ring-shaped base body (2). The invention overcomes the problem of irregular inclination of the end face of the nozzle after brazing, thereby meeting the design requirement that the planeness is less than or equal to 0.3mm, reducing the subsequent correction difficulty, shortening the correction working time and improving the production efficiency.

Description

Clamp for controlling brazing deformation of fuel header pipe

Technical Field

The invention belongs to the technical field of brazing, and particularly relates to a clamp for controlling deformation of a fuel manifold after brazing.

Background

The fuel manifold is an important part of the engine, and fuel required by the operation of the engine is conveyed through the fuel manifold, so that the welding process of components is particularly important. The parts need to connect 24 spout singlets with oil pipe through brazing and form an annular subassembly (24 spouts are evenly distributed on the oil pipe circumference), and the parts after brazing guarantee technical problems such as fuel flow, fuel distribution uniformity and spraying quality. The total number of the welding seams of the components of the fuel oil main pipe is 96; after welding, the control requirements of the sizes such as position degree, nozzle flatness and the like exist, and the size is difficult to guarantee in the brazing process.

Structural analysis is carried out on the parts, the main pipe type part is an annular part formed by combining 24 nozzles with gas hoods and 24 main oil passage pipes and 24 auxiliary oil passage pipes through vacuum brazing, and the process requires that after the parts are subjected to vacuum brazing, the fitting flatness of 24 relatively independent nozzle end faces with the gas hoods is guaranteed to be less than or equal to 0.3 mm.

Vacuum brazing is originally completed at a high temperature (1050 ℃ -1065 ℃), materials are subjected to thermal expansion at the high temperature, effective positioning of parts cannot be carried out at the high temperature, the end face of a welded nozzle is inclined outwards (welding seam shrinkage) under centripetal force, the inclination is always larger than 0.2mm, the flatness of the end face after welding is unqualified, and a large correction value must be carried out again to ensure that the flatness is smaller than or equal to 0.3 mm.

In conclusion, the flatness of the nozzle end surface after welding cannot meet the design requirements, and therefore, a clamp is required to be designed, so that the field operation and the size control can be facilitated, and the welding seam quality of parts, the size of assemblies and the like can be guaranteed.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the fixture for controlling the brazing deformation of the fuel header pipe is provided, and the problem that the end face of a nozzle is irregularly inclined after brazing is solved, so that the design requirement that the planeness is less than or equal to 0.3mm is met, the subsequent correction difficulty is reduced, the correction time is shortened, and the production efficiency is improved.

Through the structural analysis of the nozzle, a pair of symmetrical shoulders is found below the upper end surface of the nozzle, so that a counterweight is considered to be placed at the position, and the additional correction moment is provided by utilizing the self-weight difference of the counterweight to offset the deformation of the welding seam.

The technical scheme of the invention is as follows:

a clamp for controlling the brazing deformation of a fuel oil main pipe comprises a pressing unit positioned on the upper end surface of a nozzle and a supporting unit positioned on the lower end surface of the nozzle;

the pressing unit comprises a stainless steel structural member with a door-shaped cross section, and two vertical edges of the structural member are equal in width but unequal in length;

the supporting unit comprises a circular ring-shaped base body, observation ports are arranged on the outer circumference of the circular ring-shaped base body at equal intervals, and a supporting seat is arranged between two adjacent observation ports and on the upper end face of the circular ring-shaped base body.

One vertical side of the structural member is 0.2mm shorter than the other vertical side.

The depth of the inner groove of the structural member is equal to the distance from the upper end surface of the nozzle to the shoulder of the nozzle.

The supporting seat is a ring-shaped piece, and a graphite lining is arranged in the inner ring.

In the invention, the supporting seat supports the lower end of the nozzle, the structural member presses the upper end of the nozzle, the left vertical edge and the right vertical edge of the structural member have equal width and unequal length, so the self weights of the two vertical edges are different, and the top edge of the inner groove of the structural member is directly pressed on the upper end surface of the nozzle, so the two vertical edges with different self weights have different moments relative to the symmetrical axis of the nozzle, and the moment can counteract the inward shrinkage deformation trend during welding of a welding line, thereby controlling the inclination of the welded end surface of the nozzle, solving the problem of the flatness of the end surface of the nozzle, reducing the subsequent correction difficulty, reducing the correction man-hour and improving the efficiency. On the other hand, the structural member can be stably placed on the upper end face of the nozzle, the phenomenon of overturning, inclining and the like cannot occur, the graphite lining is added in the supporting seat, the phenomenon that the nozzle is bonded with the supporting seat due to evaporation of metal elements under high vacuum after welding is avoided, and the problem of scrapping caused by the fact that the nozzle cannot be normally taken out is avoided.

Drawings

FIG. 1 is a schematic view of a spout configuration;

FIG. 2 is a schematic view of a compacting unit;

FIG. 3 is a schematic view showing a state where the pressing unit is mounted on the end surface of the spout;

fig. 4 is a schematic structural view of the support unit.

Detailed Description

The technical solution of the present invention is further described below with reference to the accompanying drawings, but the scope of the claimed invention is not limited thereto.

The invention needs to braze and connect 24 nozzles with gas hoods with the main oil line pipe and the auxiliary oil line pipe, and ensures that the planeness of the 24 nozzles after brazing is less than or equal to 0.3 mm.

As shown in fig. 1, a pair of symmetrical shoulders 5 is arranged below the upper end surface of the nozzle, as shown in fig. 2 and 3, the structural member 1 is placed on the upper end surface of the nozzle across two shoulders, the structural member 1 is a stainless steel member with a door-shaped cross section and a downward notch, the total width is 25mm, the total height is 20mm, and the widths of two vertical edges are 7mm, wherein the vertical side length on the outer side (namely the outer side of the circumference of the fuel main pipe or the outer side of the circumference of the circular ring-shaped substrate 2) is 12mm, the vertical side length on the inner side is 11.8mm, and the difference between the two is 0.

As shown in fig. 4, 24 observation ports 3 are arranged on the outer circumference of the circular ring-shaped base body 2 at equal intervals (i.e. after the outer circumference is equally divided, the observation ports 3 are arranged at equal division points), the observation ports 3 are notches penetrating through the base body along the axial direction of the circular ring-shaped base body 2, supporting seats 4 are arranged on the upper end surface of the base body between the notches, and the supporting seats 4 are used for supporting the lower ends of the nozzles.

Before brazing, after 24 nozzles are assembled with the main oil line pipe and the auxiliary oil line pipe, the nozzles and the supporting seat 4 are placed in a one-to-one mode, the structural part 1 is placed on the upper end face of the nozzles, and then brazing filler metal is added and then placed into a vacuum furnace together with a clamp for brazing.

Claims

1. The utility model provides a fuel manifold anchor clamps for brazing deformation control which characterized in that: the device comprises a pressing unit positioned on the upper end surface of a nozzle and a supporting unit positioned on the lower end surface of the nozzle;

the compaction unit comprises a stainless steel structural member (1) with a door-shaped cross section, two vertical edges of the structural member (1) are equal in width but unequal in length, and a resultant moment capable of offsetting inward shrinkage deformation during welding of a welding line is generated relative to a symmetrical axis of the nozzle through different deadweights of the two vertical edges;

the supporting unit comprises a circular ring-shaped base body (2), observation ports (3) are arranged on the outer circumference of the circular ring-shaped base body (2) at equal intervals, and a supporting seat (4) is arranged between two adjacent observation ports (3) and on the upper end face of the circular ring-shaped base body (2).

2. The jig for controlling brazing deformation of a fuel manifold as set forth in claim 1, wherein: one vertical side of the structural member (1) is 0.2mm shorter than the other vertical side.

3. The jig for controlling brazing deformation of a fuel manifold as set forth in claim 1, wherein: the depth of the inner groove of the structural part (1) is equal to the distance from the upper end surface of the nozzle to the shoulder part (5) of the nozzle.

4. The jig for controlling brazing deformation of a fuel manifold as set forth in claim 1, wherein: the supporting seat (4) is a ring-shaped piece, and a graphite lining is arranged in the inner ring.