CN112397966A

CN112397966A - Aircraft ignition cable assembling method

Info

Publication number: CN112397966A
Application number: CN202011269852.2A
Authority: CN
Inventors: 陈效
Original assignee: Sichuan Fanhua Aviation Instrument and Electrical Co Ltd
Current assignee: Sichuan Fanhua Aviation Instrument and Electrical Co Ltd
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2021-02-23

Abstract

The invention discloses an aircraft ignition cable assembly method, which comprises the steps of firstly sleeving a first connecting sleeve on the outer side of the end part of a metal hose, and carrying out first fusion welding on the end part to obtain a hose assembly; then the copper braided sleeve is passed through the hose assembly and turned outwards at the end of the hose assembly; and a second connecting sleeve is sleeved outside the end part of the hose assembly, a copper woven sleeve is arranged between the first connecting sleeve and the second connecting sleeve, and the joint of the first connecting sleeve and the second connecting sleeve is subjected to secondary fusion welding. The invention divides the original assembling and welding process into two times, divides the original metal part into two parts, and improves the original brazing processing into two fusion welding forming. The three-proofing assembly structure is high in practicability, and the problem that the existing assembly structure cannot meet the three-proofing performance of a product is solved. Meanwhile, the structural strength is improved, the appearance is attractive, the manufacturability is good, and the universal applicability is realized.

Description

Aircraft ignition cable assembling method

Technical Field

The invention belongs to the technical field of assembly of aircraft ignition cables, and particularly relates to an assembly method of an aircraft ignition cable.

Background

With the increase of the types of ignition cables, the types of the cable using a high magnetic conductivity metal composite hose (abbreviated as a metal hose) as a cable forming main body have reached dozens, for example: ignition cables DDL-63, DDL-65, Q/DDL-72.73 series, etc. As shown in fig. 3, the metal hose is composed of a stainless steel wire braid and a stainless steel corrugated tube.

When the cable is processed, a layer of copper braided sleeve is assembled in the hole of the metal hose, and then two ends of the copper braided sleeve are connected with the metal parts. At present, the connection adopts a flame brazing mode, the processing procedures are multiple, the oxidation after welding is serious, and the cleaning is time-consuming and labor-consuming. The more important problem is that silver-copper solder is used during flame brazing, and the processed product is seriously corroded in a three-proofing test, cannot pass the test and is reduced in reliability.

Through analysis, the cable has serious corrosion phenomenon in a three-proofing test, and the main reason is that silver-copper solder exists and electrochemical corrosion is generated in a salt spray environment. The flame brazing necessarily needs to add solder, and to avoid or reduce corrosion, only a fusion welding mode, such as argon arc welding and electron beam welding, can be adopted, and the solder of the same metal as the base material is added, or the base material is melted to achieve the purpose of connection.

Therefore, the invention provides an aircraft ignition cable assembly method, redesigns and adjusts the assembly structure of the metal hose and the parts, changes the joint form and the processing technique method, and solves the corrosion problem of the three-proofing test of the product.

Disclosure of Invention

The invention aims to provide an aircraft ignition cable assembling method, which aims to solve the problems.

The invention is mainly realized by the following technical scheme:

an aircraft ignition cable assembly method mainly comprises the following steps:

step S100: sleeving a first connecting sleeve on the outer side of the end part of the metal hose, and performing first fusion welding on the end part to obtain a hose assembly;

step S200: the copper braided sleeve penetrates through the hose assembly and is turned outwards at the end part of the hose assembly; and a second connecting sleeve is sleeved outside the end part of the hose assembly, a copper woven sleeve is arranged between the first connecting sleeve and the second connecting sleeve, and the joint of the first connecting sleeve and the second connecting sleeve is subjected to secondary fusion welding.

In order to better implement the present invention, further, in step S100, a first fusion welding is performed on a plane of an end portion of the metal hose, which is sleeved with the first connection sleeve.

In order to better implement the present invention, further, in step S200, the first connection sleeve is provided with a receiving limit table, the second connection sleeve is correspondingly provided with an abutting surface, one end of the copper braided sleeve is turned outwards and is attached along the length direction of the first connection sleeve, and the abutting surface is fixedly connected with the receiving limit table.

In order to better realize the invention, further, the positions of the bearing limit table and the abutting surface are welded for the second time.

In order to better realize the invention, further, the metal hose comprises a stainless steel corrugated pipe and a stainless steel wire woven sleeve which are sleeved from inside to outside in sequence; the end part outer side of the stainless steel wire weaving sleeve is sleeved with a first connecting sleeve.

In order to better realize the invention, further, the copper braided sleeve is fit and sleeved inside the hose assembly.

The invention has the beneficial effects that:

(1) the invention has high strength and high three-proofing performance, improves the product reliability through the structural design and has better practicability;

(2) the invention changes the assembly structure, adopts fusion welding to replace brazing, improves the joint strength and can bear larger load; the oxidation degree of the fusion welding joint is low, the manufacturability is good, and the appearance is beautiful; the three-proofing performance of the fusion welding joint is good, and the reliability of the product is improved;

(3) the invention divides the original assembling and welding process into two times, divides the original metal part into two parts, and improves the original brazing processing into two fusion welding forming. The three-proofing assembly structure is high in practicability, and the problem that the existing assembly structure cannot meet the three-proofing performance of a product is solved. Meanwhile, the structural strength is improved, the appearance is attractive, the manufacturability is good, and the universal applicability is realized.

Drawings

FIG. 1 is a schematic view of a hose assembly;

FIG. 2 is a schematic view of a connection structure of the hose assembly and the second connecting sleeve;

fig. 3 is a schematic structural view of the metal hose.

Wherein: 1-stainless steel wire braided sleeve, 2-stainless steel corrugated pipe, 3-first connecting sleeve, 4-copper braided sleeve and 5-second connecting sleeve.

Detailed Description

Example 1:

step S100: as shown in fig. 1, a first connecting sleeve 3 is sleeved outside the end part of the metal hose, and the end part is subjected to first fusion welding to obtain a hose assembly;

step S200: as shown in fig. 2, the copper braid 4 is threaded through the hose assembly and turned inside out at the end of the hose assembly; and a second connecting sleeve 5 is sleeved outside the end part of the hose assembly, a copper braided sleeve 4 is arranged between the first connecting sleeve 3 and the second connecting sleeve 5, and the joint between the first connecting sleeve and the second connecting sleeve is subjected to secondary fusion welding.

The invention divides the original assembling and welding process into two times, divides the original metal part into two parts, and improves the original brazing processing into two fusion welding forming. The three-proofing assembly structure is high in practicability, and the problem that the existing assembly structure cannot meet the three-proofing performance of a product is solved. Meanwhile, the structural strength is improved, the appearance is attractive, the manufacturability is good, and the universal applicability is realized.

Example 2:

this embodiment is optimized based on embodiment 1, and the first fusion welding is performed on the plane of the end portion of the metal hose sleeved with the first connecting sleeve 3 in step S100.

Further, as shown in fig. 1 and 3, the metal hose includes a stainless steel corrugated tube 2 and a stainless steel wire braided sleeve 1 which are sequentially sleeved from inside to outside; the stainless steel wire braided sleeve 1 is sleeved with a first connecting sleeve 3 at the outer side of the end part.

Further, the copper braided sleeve 4 is fitted and sleeved inside the hose assembly.

Other parts of this embodiment are the same as embodiment 1, and thus are not described again.

Example 3:

the embodiment is optimized on the basis of

embodiment

1 or 2, in the step S200, the first connection sleeve 3 is provided with a receiving limit table, the second connection sleeve 5 is correspondingly provided with an abutting surface, one end of the copper braided sleeve 4 is turned outwards and is attached to the first connection sleeve 3 along the length direction, and the abutting surface is fixedly connected with the receiving limit table.

Further, welding the positions of the bearing limit table and the abutting surfaces for the second time.

The rest of this embodiment is the same as

embodiment

1 or 2, and therefore, the description thereof is omitted.

Example 4:

an aircraft ignition cable assembly method is shown in figures 1 and 2, and a cable assembly structure is composed of a main body and two metal parts. This is done in two parts, assembly and welding. As shown in fig. 1, first, the metal hose comprises an outer layer of stainless steel wire braid and an inner layer of stainless steel bellows 2, and the ends of the stainless steel wire braid are assembled with a first coupling sleeve 3, the end faces are leveled, a is fusion welded, a to form a hose assembly, and the welded joint is trimmed.

As shown in fig. 2, the copper braid 4 is passed through the hose assembly, the end portion is turned over, the second nipple 5 is assembled, the copper braid 4 is pressed between the hose assembly and the second nipple 5, B is fusion welded, and the welded joint is polished. The ideal product can be processed by the assembly structure and the process.

The product in this example was subjected to a complex salt spray test and a neutral salt spray test, the test conditions of which are shown in tables 1 and 2. After the test, the metal structural part is found to have no obvious darkening, blackening and corrosion in a composite salt spray test; the metal joint is not corroded; the corrosion area of the metal protective layer accounts for less than 10% of the area of the metal protective layer; a large amount of white corrosion exists at the thread; the non-metallic material has no obvious phenomena of whitening, expansion, bubbling, cracking, falling off, pockmarking and the like. In a neutral salt spray test, the metal structural part does not become dark and black slightly and is free from corrosion; the metal joint is free from corrosion; the corrosion area of the metal protective layer accounts for 5 percent of the area of the metal protective layer; the coating layer has no bubbles, wrinkles, cracks or falls off except local edges, and the bottom metal has no corrosion; the non-metallic material has no obvious whitening, expansion, bubbling, cracking, falling off, pockmark and the like. Therefore, the three-proofing performance of the cable product processed by the method passes the examination and has excellent performance.

The invention adopts a fusion welding mode to connect the main body and the metal parts by changing the assembly structure, decomposes and designs the metal parts into two types, and realizes the final connection by two times of assembly and welding. The original assembling and welding process is divided into two steps, one original metal part is divided into two steps, and meanwhile, the original brazing processing is improved into two-step fusion welding forming. The three-proofing assembly structure is high in practicability, and the problem that the existing assembly structure cannot meet the three-proofing performance of a product is solved. Meanwhile, the structural strength is improved, the appearance is attractive, the manufacturability is good, and the universal applicability is realized. Through the structural design, the invention has the advantages of good manufacturability, high strength and high three-proofing performance, and improves the reliability of products.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.

Claims

1. An aircraft ignition cable assembly method is characterized by mainly comprising the following steps:

2. An aircraft ignition cable assembling method as claimed in claim 1, wherein in step S100, a first fusion welding is performed on a plane of an end portion of the metal hose which is sleeved with the first connection sleeve.

3. The method as claimed in claim 1, wherein in step S200, the first connection sleeve is provided with a receiving stop, the second connection sleeve is correspondingly provided with an abutting surface, one end of the copper braided sleeve is turned outwards and is attached to the first connection sleeve along the length direction of the first connection sleeve, and the abutting surface is fixedly connected with the receiving stop.

4. An aircraft ignition cable assembly method as claimed in claim 3, characterised in that a second fusion weld is applied to the receiving abutment and the abutment surface.

5. The method for assembling an aircraft ignition cable according to claim 1, wherein the metal hose comprises a stainless steel corrugated pipe and a stainless steel wire braided sleeve which are sleeved in sequence from inside to outside; the end part outer side of the stainless steel wire weaving sleeve is sleeved with a first connecting sleeve.

6. The method of assembling an aircraft ignition cable of claim 1, wherein the copper braided sleeve fits snugly inside the hose assembly.