Oil cooler chip brazing process and oil cooler thereof

Abstract

The invention discloses an oil cooler chip brazing process and an oil cooler thereof, and relates to the technical field of oil cooler brazing processes. Comprising the following steps of: adopting a blanking and stretching forming process for the chip, and performing unequal-diameter stamping treatment on the hole diameter of a boss of the chip in the blanking and stretching forming process, so that when the chip is assembled, the hole diameter of the boss positioned at the upper part is greater than the hole diameter of the boss positioned at the upper part in two attached bosses, thereby forming a step with the width of 0.2-0.4 mm; the soldering flux is evenly smeared / sprayed on the boss welding end face with the large boss hole diameter; and after being assembled, the product is put into a brazing furnace to be welded. According to the invention, the problem of solder leakage of chip boss welding by adopting a blanking stretching forming process in the prior art is solved, pseudo soldering is avoided, and the rate of finished products is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil cooler brazing technology, in particular to an oil cooler chip brazing technology and an oil cooler thereof. Background Art

[0002] Oil cooler brazing is an important welding process for the production of aluminum oil coolers. The oil cooler is divided into layers of chips. After assembly, brazing flux is applied / sprayed on the contact surface of the chips. The chips are clamped and fixed by brazing fixtures and placed in a brazing furnace for welding to form the main body of the oil cooler. At present, the oil cooler chips can be made by blanking and stretching forming processes. The existing oil cooler brazing upper and lower chip boss sizes are designed to be equal diameter structures, but during welding, the brazing fixture applies a clamping force, causing the boss to slightly warp. When the gap is larger than the welding gap, it will cause solder loss, and there will be no solder in some parts. After the product is out of the furnace, it will cause local cold solder joints, reducing the welding strength of the product structure. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides an oil cooler chip brazing process and an oil cooler thereof, which solves the problem of solder leakage in chip boss welding using the existing blanking and stretching forming process.

[0004] The specific technical solutions are as follows:

[0005] In a first aspect, the present invention discloses a brazing process for an oil cooler chip, wherein the chip adopts a blanking and stretching forming process, comprising:

[0006] In the blanking and stretching process, the chip boss aperture is subjected to unequal diameter stamping treatment, so that when the chip is assembled, the aperture of the upper boss of the two mating bosses is larger than the aperture of the upper boss, thereby forming a step with a width of 0.2-0.4mm; when applying / spraying the brazing flux, the welding end face of the boss with a larger aperture is evenly applied / sprayed with the brazing flux; after the product is assembled, it is placed in a brazing furnace for welding.

[0007] Furthermore, in the above scheme, when applying / spraying the flux, the flux is evenly applied / sprayed on the welding end faces of the chip bosses.

[0008] The above solution further forms a welding fillet at the step of the boss.

[0009] In the above solution, the oil cooler uses a plate compounded with a brazing agent.

[0010] In a second aspect, the present invention further discloses an oil cooler, which is manufactured by the above-mentioned oil cooler chip brazing process and has a welding fillet at the step of the boss.

[0011] Furthermore, in the above solution, the radius of the welding fillet is not greater than the step width.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] In the present invention, when designing the boss, the diameter of the upper chip is enlarged to form a step with the lower chip. When the solder melts, the solder will accumulate on the step to form a welding fillet, thereby enhancing the structural strength of the welding point.

[0014] The invention solves the problem of solder leakage in chip boss welding using the existing blanking and stretching forming process, avoids the existence of cold solder joints, and improves the yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the brazing of oil cooler chips in the prior art;

[0016] Figure 2 This is a schematic diagram of the brazing of the oil cooler chip in the present invention;

[0017] Figure 3 It is a schematic diagram of forming a welding fillet at the step of the present invention.

[0018] In the attached drawings, 1-chip, 2-boss, 3-step, 4-welding fillet. DETAILED DESCRIPTION

[0019] The following is a further detailed description of the embodiments of the invention in conjunction with the accompanying drawings to make the objectives, technical solutions and technical effects of the invention more clearly presented.

[0020] Example 1

[0021] like Figure 1 The figure shows a schematic diagram of brazing an oil cooler chip 1 in the prior art. When brazing an oil cooler chip 1 in the prior art, the bosses 2 of the upper and lower chips 1 of the oil cooler are equal diameter structures, that is, the edges are aligned. Here, the bosses 2 of the chip 1 correspond to each other, and a through hole is set in the middle of the boss 2. The bosses 2 of the two chips 1 correspond to each other up and down, that is, a cooling cavity or a heat exchange cavity is formed, and the through hole in the middle of the boss 2 is the main channel for liquid inlet or liquid inlet.

[0022] like Figure 2 As shown, the oil cooler structure of the present invention is shown. Specifically, when the oil cooler chip 1 is brazed, the aperture of the upper boss 2 of the two bosses 2 that fit together is larger than the aperture of the upper boss 2, thereby forming a 0.2-0.4mm width step 3. In this embodiment, a 0.3mm width step 3 is selected. By setting it in this way, after being placed in a brazing furnace for welding, a welding fillet 4 as shown in Figure 3 can be formed.

[0023] Example 2

[0024] The present invention discloses a brazing process for an oil cooler chip 1, which specifically includes:

[0025] Chip 1 is formed by blanking and stretching process.

[0026] In the blanking and stretching process, the apertures of the bosses 2 of the chip 1 are subjected to unequal diameter stamping processing, so that when the chip 1 is assembled, the aperture of the upper boss 2 of the two bosses 2 that fit together is larger than the aperture of the lower boss 2, thereby forming a step 3 with a width of 0.24 mm.

[0027] When spraying the brazing flux, evenly apply / spray the brazing flux on the welding end face of the boss 2 with a larger hole diameter; after the product is assembled, put it into the brazing furnace for welding.

[0028] A welding fillet 4 is formed at the step 3 of the boss 2 , and a specific requirement is that the radius of the welding fillet 4 is not greater than the width of the step 3 .

[0029] Here, when applying / spraying the flux, the flux is evenly applied / sprayed on the welding end faces of the bosses 2 of the chip 1. This can make the welding fillet 4 more rounded and ensure the welding fillet 4 is formed.

[0030] Example 3

[0031] The present invention also discloses an oil cooler, which is formed by stacking chips 1. Specifically, the oil cooler is made by the brazing process of the oil cooler chip 1 of Example 2. Here, the step 3 of the boss 2 has a welding fillet 4, wherein the radius of the welding fillet 4 is not greater than the width of the step 3.

[0032] The above description is only a preferred feasible embodiment of the present invention and is not intended to limit the scope of the patent application of the present invention. All equivalent changes, equivalent substitutions or modified changes performed within the technical spirit and principles suggested by the present invention should be included in the scope of patent protection covered by the present invention.

Claims

1. Oil cooler chip brazing process, the chip adopts blanking and stretching forming process, which is characterized by: include: In the blanking and stretching process, the chip boss aperture is subjected to unequal diameter stamping treatment, so that when the chip is assembled, the aperture of the upper boss of the two mating bosses is larger than the aperture of the upper boss, thereby forming a step with a width of 0.2-0.4mm; when applying / spraying the brazing flux, the welding end face of the boss with a larger aperture is evenly applied / sprayed with the brazing flux; after the product is assembled, it is placed in a brazing furnace for welding.

2. The oil cooler chip brazing process according to claim 1, characterized in that: When applying / spraying the flux, evenly apply / spray the flux to the welding end faces of the chip bosses.

3. The oil cooler chip brazing process according to claim 2, characterized in that: A weld fillet is formed at the step of the boss.

4. The oil cooler chip brazing process according to claim 1, characterized in that: The oil cooler uses a plate compounded with brazing flux.

5. Oil cooler, characterized by: The oil cooler chip is manufactured by the brazing process of any one of claims 1 to 4, and has a welding fillet at the step of the boss.

6. The oil cooler according to claim 5, characterized in that: The welding fillet radius is not greater than the step width.

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