CN110102847B

CN110102847B - Method for processing core body of aluminum alloy tube type radiator

Info

Publication number: CN110102847B
Application number: CN201910289864.2A
Authority: CN
Inventors: 万海龙; 龙本滔; 冉春交; 吴长洪
Original assignee: Guizhou Yonghong Aviation Machinery Co Ltd
Current assignee: Guizhou Yonghong Aviation Machinery Co Ltd
Priority date: 2019-04-11
Filing date: 2019-04-11
Publication date: 2021-04-23
Anticipated expiration: 2039-04-11
Also published as: CN110102847A

Abstract

The invention discloses a method for processing an aluminum alloy tubular radiator core, which comprises the steps of part processing, cleaning, brazing filler metal processing, brazing filler metal assembling, brazing flux spraying, brazing, flame brazing, tightness checking and the like. Compared with the expansion joint processing mode, the pull-out force of a welding joint is far greater than that of an expansion joint under the same condition, namely the strength of the joint is higher; the processing technology is simple and convenient, and the processing efficiency is high.

Description

Method for processing core body of aluminum alloy tube type radiator

Technical Field

The invention relates to the technical field of processing of aluminum alloy parts, in particular to a method for processing an aluminum alloy tube type radiator core.

Background

At present, the main connection mode of a radiating pipe (material brand 3A21) of a core body of an aluminum alloy tube type radiator and an end cover (material brand 6063) of the core body is mainly hydraulic expansion joint, the connection mode has long processing period and is difficult to realize mass production; and under the same structural condition, the pull-out force of the expansion joint is far smaller than that of the welding joint, namely the bearing capacity of the welding joint is obviously higher than that of the expansion joint.

However, no recorded data related to the brazing of the 3a21 aluminum capillary and the 6063 core end cap exists in the industry at present, because the structural brazing difficulty is that the welding assembly gap, the brazing filler metal using amount, the brazing filler metal assembly and brazing parameters need to be reasonably controlled. The invention solves the brazing difficulty, realizes zero leakage of the brazing welding line and finally processes qualified products.

Disclosure of Invention

The invention aims to provide a processing method of an aluminum alloy tubular radiator core, which improves the production efficiency of an aluminum alloy tubular radiator core product, realizes mass production, and simultaneously improves the connection strength of a radiating pipe and an end plate of the product and the product performance.

A method for processing an aluminum alloy tube type radiator core comprises the following steps:

(A) processing parts: processing a core end cover, a radiating pipe, a partition plate process assembly with a groove, a cylinder and a partition plate mounting process assembly, and then processing a through hole for inserting the radiating pipe on the core end cover;

(B) cleaning: cleaning the parts and the brazing filler metal processed in the step (A) according to an aluminum alloy pickling method;

(C) processing the brazing filler metal: processing through holes with the same number as the core body end covers on the brazing filler metal;

(D) assembling brazing filler metal: assembling each part processed in the step (A) and brazing filler metal in place;

(E) spraying a brazing flux: preparing a brazing flux by using absolute ethyl alcohol, and spraying the brazing flux on a welding seam;

(F) brazing: placing the checked workpiece into a vacuum brazing furnace for welding;

(G) flame brazing: brazing the grooved partition plate process assembly and the barrel by adopting flame brazing, wherein the joints of the barrel and the partition plate process assembly are respectively brazed;

(H) and (3) checking the sealing property: and assembling the airtight tool on the partition plate process assembly with the groove and the partition plate mounting process assembly, and checking the tightness of the workpiece under the pressure of 1.0 MPa.

In the step (A), a brazing gap which is less than or equal to 0.1mm is reserved between the through hole processed in the core body end cover and the outer surface of the radiating pipe.

In the step (C), the grade of the brazing filler metal is 4045, the brazing filler metal is in a sheet shape, the thickness of the brazing filler metal is 0.1mm, the using amount of the brazing filler metal is determined according to the thickness of a welding seam, and burrs are not allowed to exist in an orifice of the processed brazing filler metal.

The brazing temperature for brazing in the step (F) is 600 +/-5 ℃.

Compared with the existing processing method, the processing method of the aluminum alloy tubular radiator core body realizes NOCOLOK brazing of the aluminum capillary radiating pipe with the grade of 3A21 and the core body end cover with the grade of 6063, makes a breakthrough in NOCOLOK brazing research, and provides an alternative method for processing the aluminum alloy tubular radiator core body.

Drawings

FIG. 1 is a structural view of a core of an aluminum alloy tubular radiator according to the present invention;

in the figure: 1-core end cover, 2-radiating pipe (capillary), 3-grooved partition plate process assembly, 4-cylinder, 5-partition plate process assembly installation and 6-brazing filler metal.

Detailed Description

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

The aluminum alloy shell and tube radiator core includes: the core end cover 1, the radiating pipe 2, the grooved partition plate process assembly 3, the cylinder 4 and the partition plate installation process assembly 5 are assembled by a positioning rod in the prior processing method, then the radiating pipe 2 is inserted and connected on the end cover 1 in an expanding mode through rivets, 780 radiating pipes are arranged in one set of radiator core, two ends of the radiating pipe need to be connected in an expanding mode, the workload is large, and the time is long. The invention adopts brazing to connect the radiating pipe 2 and the core body end cover 1, can carry out a plurality of sets of welding at the same time and has high production efficiency.

(A) Processing parts: processing a core end cover 1, a radiating pipe 2, a partition plate process assembly 3 with a groove, a cylinder 4 and a partition plate mounting process assembly 5 according to the drawing requirements, then processing a plurality of through holes for inserting the radiating pipe 2 on the core end cover 1, and leaving a brazing gap of 0.08mm between the through holes and the outer surface of the radiating pipe 2;

(B) cleaning: cleaning the parts processed in the step (A) and the brazing filler metal 6 according to an aluminum alloy pickling method;

(C) processing the brazing filler metal: as shown in fig. 1, selecting a sheet-shaped brazing filler metal 6 with equal thickness, wherein the sheet can be flatly paved on the end surface of the groove of the core end cover 1, processing through holes with the same number and the same position as the core end cover 1 on the brazing filler metal 6 by using a special die, and removing burrs of an orifice;

(D) assembling brazing filler metal: as shown in fig. 1, the parts and brazing filler metal 6 are assembled in place as shown in fig. 1;

(E) spraying a brazing flux: preparing the brazing flux by absolute ethyl alcohol, and spraying the prepared brazing flux at a welding seam by using an injector to enable the brazing flux to cover the brazing filler metal;

(F) brazing: placing the checked workpiece into a vacuum brazing furnace for brazing, wherein the brazing welding temperature is 600 ℃, and the heat preservation time is 15 min;

(G) flame brazing: brazing the grooved partition plate process assembly 3 and the barrel 4 in a flame brazing mode, wherein the joints of the barrel 4 and the partition plate process assembly 5 are brazed respectively, and a welding seam is required to be not leaked;

(H) and (3) checking the sealing property: assembling an airtight tool on the partition plate process component 3 with the groove and the partition plate process component 5, checking the tightness of the workpiece under the pressure of 1.0MPa, and warehousing the product after the checking is qualified.

The basic principles and the main features of the present invention are shown and described above, the present invention is not limited by the above embodiments, the above embodiments and descriptions are only for the basic principles of the present invention, and any variations, modifications, equivalents, and the like based on the technical solutions of the present invention should fall within the protection scope of the present invention.

Claims

1. A processing method of an aluminum alloy tubular radiator core body is characterized in that the material brand of a radiating pipe (2) of the aluminum alloy tubular radiator core body is 3A21, and the material brand 6063 of a core body end cover (1) comprises the following steps:

(A) processing parts: processing a core end cover (1), a radiating pipe (2), a partition plate process assembly (3) with a groove, a cylinder (4) and a partition plate mounting process assembly (5), then processing a through hole for inserting the radiating pipe (2) on the core end cover (1), and reserving a brazing gap which is less than or equal to 0.1mm between the through hole processed on the core end cover (1) and the outer surface of the radiating pipe (2);

(B) cleaning: cleaning the parts processed in the step (A) and the brazing filler metal (6) according to an aluminum alloy pickling method;

(C) processing the brazing filler metal: processing through holes with the same number as that of the core body end covers (1) on the brazing filler metal (6), wherein the number of the brazing filler metal (6) is 4045, the brazing filler metal is in a sheet shape, the thickness of the brazing filler metal is 0.1mm, the using amount of the brazing filler metal is determined according to the thickness of a welding seam, and burrs are not allowed to exist in an orifice of the processed brazing filler metal;

(D) assembling brazing filler metal: assembling each part processed in the step (A) and brazing filler metal (6) in place;

(F) brazing: placing the checked workpiece into a vacuum brazing furnace for welding, wherein the brazing temperature for brazing is 600 +/-5 ℃;

(G) flame brazing: brazing the grooved partition plate process assembly (3) and the barrel (4) by adopting flame brazing, wherein the joints of the barrel (4) and the partition plate process assembly (5) are respectively brazed;

(H) and (3) checking the sealing property: and assembling the airtight tool on the grooved partition plate process assembly (3) and the installation partition plate process assembly (5), and checking the tightness of the workpiece under the pressure of 1.0 MPa.