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Method for brazed joint of metal workpieces

A technology for metal workpieces and workpieces, applied in the field of brazing metal workpieces, can solve the problems of increasing the manufacturing steps of heat exchangers, increasing the steps of cleaning workpieces, increasing production costs, etc.

Inactive Publication Date: 2005-03-16
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this increases the steps (time) of cleaning the workpiece and the manufacturing steps of the heat exchanger, thereby increasing the production cost

Method used

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  • Method for brazed joint of metal workpieces
  • Method for brazed joint of metal workpieces
  • Method for brazed joint of metal workpieces

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0037] The brazing method of the first embodiment of the present invention is used to manufacture automobile radiators.

[0038] like figure 1 As shown, the radiator 100 is composed of a core 110 and an end tank 120. The core 110 includes a plurality of tubes 111 through which cooling water passes and a plurality of tubes arranged between the tubes 111 to promote heat exchange between the cooling water and air. Corrugated fins 112 , end tanks 120 are provided at both longitudinal ends of the tubes 111 and communicate with each tube 111 .

[0039] The end water tank 120 is composed of a core plate 121 and a water tank body 122, the pipe 111 is inserted into the core plate 121, and the water tank body 122 and the core plate 121 together form an inner water holding space. According to this embodiment, the tube 111, the fins 112, and the core plate 121 are made of aluminum alloy, and the tank body 122 is made of resin.

[0040] The tube 111, the fin 112 and the core plate 121 ar...

no. 2 example

[0054] Unlike the first embodiment in which the suspension is applied by spraying (spraying) the suspension onto the workpiece from a nozzle, in Figure 5 In the illustrated embodiment, the coating step is carried out by a trickle method which releases suspended droplets to the workpiece.

no. 3 example

[0056] Different from the foregoing embodiments in which the heating step is performed by blowing hot air to the workpiece (hereinafter referred to as the hot air heating method), in the Image 6 In the illustrated embodiment, the heating step is performed by heating the workpiece in a heating furnace (hereinafter referred to as furnace heating method), and the coating step is performed by spraying.

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Abstract

A method of brazing a metal work is disclosed, in which the work is heated to at least the softening temperature of resin and coated with a suspension constituted of a mixture of a flux and a binder, after which the work is brazed by being heated and dried. As a result, the binder (resin) attached to the surface of the work is softened and increases in stickiness. Even if foreign matter becomes attached to the work surface, therefore, the binder causes the flux to be firmly attached to (coupled with) the work surface together with the foreign matter. Thus, the flux can be securely coated (attached) on the work surface. The temperature of the work is not lower than the evaporation temperature of water. Even if oil becomes attached to the work surface, therefore, the water in the suspension is evaporated before it can be repelled by the oil, thus making it possible to prevent the flux from being repelled along with the water. In this way, the flux can be securely coated (attached) on the work surface.

Description

【Technical field】 [0001] The present invention relates to a method of brazing metal workpieces, and more particularly, the present invention relates to a method of brazing metal workpieces which can be effectively applied to aluminum heat exchangers such as radiators. 【Background technique】 [0002] JP7-185796A discloses a method of brazing a heat exchanger in which a workpiece such as a cooling fin is immersed in a suspension composed of an aqueous binder solution made of flux and resin, which is applied to the workpiece On the surface, the workpiece is dried by heating, so that the flux is firmly attached to the surface of the workpiece, and then heated in a heating furnace to braze the workpiece. [0003] In the invention disclosed in the above patent, the aqueous binder solution and flux suspension are simply applied to the workpiece. When there are foreign matter such as metal flakes attached to the surface of the workpiece and the suspension is applied under this cond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28F1/32B23K1/00B23K1/19B23K1/20B23K3/00B23K35/14B23K35/363B23K101/14B23K103/10F28F9/18F28F13/18
CPCF28F13/18B23K1/0012F28F21/084B23K1/203
Inventor 木村薰英服部博邦
Owner DENSO CORP
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