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NB continuous brazing core body heating method for automobile radiator brazing process

A technology of automobile radiator and brazing process, which is applied in the direction of instruments, electric heating devices, manufacturing tools, etc., and can solve problems such as inability to directly measure temperature

Inactive Publication Date: 2019-06-25
安徽双桦智能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

4. Product spacing
The main difficulty in improving the brazing process: brazing in a closed furnace, it is impossible to directly measure the temperature and observe the brazing status of the product in real time

Method used

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  • NB continuous brazing core body heating method for automobile radiator brazing process
  • NB continuous brazing core body heating method for automobile radiator brazing process
  • NB continuous brazing core body heating method for automobile radiator brazing process

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Effect test

Embodiment 1

[0129] A kind of NB continuous brazing core body heating method of automobile radiator brazing process, the method comprises the following steps:

[0130] S1: Establish a core heating model, which calculates the heat flow at the core surface boundary as follows:

[0131] (1) The effective heat flow per unit of radiation heat exchange between the furnace and the core is:

[0132] q 1 = σ 0 ·C gwm ·(T f 4 -T s 4 ) (3-1)

[0133] The unit effective heat obtained by convection on the surface of the core is:

[0134] q 2 =a·(T f -T s ) (3-2)

[0135] Then the total effective heat flow obtained by the core in the furnace is:

[0136]

[0137] In the formula:

[0138] T f , T s --------Respectively represent furnace gas and core body surface temperature, K;

[0139] a----------Convective heat transfer coefficient of furnace gas to core body, W / (m2·℃)

[0140] C gwm -------The conduction radiation coefficient of the furnace gas and the furnace wall to the radiati...

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Abstract

The invention provides a NB continuous brazing core body heating method for an automobile radiator brazing process. The heating method comprises the following steps of establishing a core heating model, calculating boundary heat flow of the core surface by the model; solving a total heat absorption rate by adopting a test method, obtaining the total heat absorption rate of each position inside a hearth according to a position corresponding to a central position of a core body in the furnace, and realizing a mathematical model control for a heating furnace. According to the method, states of products in the furnace is controlled in real time through the model, the brazing quality is improved, according to the heat transfer principle, a three-dimensional transient thermal analysis model is constructed, a simulation and test combination method is adopted, the product states in the furnace is monitored, a core heating model is established, a simulated thermal cycle curve is basically matched with a measured thermal cycle curve, so that the correctness of the finite element model is proved, parameters of the brazing process are preliminarily determined through the simulation method, initial parameters of the model are changed by utilizing the model, and an optimal brazing heating system is found out.

Description

technical field [0001] The invention relates to the technical field of brazing, in particular to an NB continuous brazing core heating method for the brazing process of an automobile radiator. Background technique [0002] The car radiator mainly transfers the heat of the engine to the surrounding environment through the coolant, which has achieved the purpose of reducing the engine temperature. The working fluid in the car engine cooling system circulates in a closed pipeline, and the system components are required to be replaced. Factors such as thermal performance, sealing performance, structural composition, and service life must meet the specified standards. Therefore, in the brazing process of the radiator, it is required to have sealing and fatigue resistance. The brazing process directly affects the quality of the radiator. How to improve the quality of brazing has become the main direction of current research on brazing technology. [0003] The brazing process is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00B23K1/008B23K3/04G06F17/50
Inventor 杨骏程瑞成陶伟平
Owner 安徽双桦智能技术有限公司
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