WO2018036187A1

WO2018036187A1 - Non-contact heating tin brazing method for welding metal structure and hardware

Info

Publication number: WO2018036187A1
Application number: PCT/CN2017/082151
Authority: WO
Inventors: 吕晓胜; 郭林波; 刘峰; 薛锋章; 刘海滨; 朱龙翔; 马红智
Original assignee: 京信通信技术(广州)有限公司; 京信通信系统（中国）有限公司; 天津京信通信系统有限公司
Priority date: 2016-08-22
Filing date: 2017-04-27
Publication date: 2018-03-01
Also published as: CN106270864A; CN106270864B

Abstract

A non-contact heating tin brazing method for welding a metal structure (2) and hardware, comprising the following steps: presetting a workpiece on a conveying system and transferring the workpiece to a heating system, wherein the workpiece comprises: a preassembled structure of a metal structure (2) and hardware, a solder preset at solder joints (3, 4) between the metal structure (2) and the hardware, and a turnover fixture for positioning the preassembled structure; heating the workpiece by means of non-contact thermal radiation, so that the solder at the solder joints (3, 4) is sufficiently melted; cooling the workpiece after heating brazing is completed, so as to allow the solder joints to solidify rapidly. By separating the processes of assembling components to be welded, adding a solder, and performing heating welding, the different processes can be managed in a refined manner, which helps to improve welding efficiency; by adopting non-contact overall heating welding, solder joints may fully absorb the heat and then melt, thus wetting, flowing and element diffusing may be carried out on the solder joints between a metal structure and hardware, which helps to improve welding quality.

Description

Non-contact heating tin brazing method for metal structural parts and hardware

Technical field

The invention relates to the field of processing technology, in particular to a welding related process of key components in the communication field, in particular to a non-contact heating tin brazing method for metal structural parts and hardware parts.

Background technique

The base station antenna is a key component of the coverage of the mobile communication network. Among them, a large class of mainstream components are formed by lap welding metal structures and hardware. The soldering quality of the mainstream device determines the product specifications of the base station antenna, in order to ensure good electrical connection continuity and structural connection stability, solder consistency, solder joint penetration and mechanical strength. There are demanding requirements, therefore, the quantitative control of welding process parameters is a major prerequisite for achieving product consistency.

As is known, the traditional tin brazing process is a local heating welding method in which a soldering iron is used to heat the contact point, and the solder wire is used to fill the solder. The welding method of the metal structural parts of the communication industry is basically also welded by this electric soldering iron. Due to the endothermic effect of the metal structural parts, in order to make the heating meet the welding requirements, high temperature transfer or long-time contact welding is required, a high-power soldering station must be selected, and the iron tip is accelerated due to high temperature for a long time. The life is greatly reduced, and the uneven heating of the solder joints is inevitably unable to ensure the consistency of the soldering temperature, which results in a decrease in the reliability of the soldering quality. On the other hand, the manual soldering method cannot guarantee the consistency of the soldering time and the amount of tin delivered, and the quality is consistent. Poor performance and low welding efficiency.

In addition, the irregularities of the metal structural parts and the hardware components in the base station antenna cause the welding points to be multi-directional, that is, the multi-dimensional solder joints exist at the same time, and the manual soldering iron is used for welding, which needs to be repeatedly placed and positioned. It is basically impossible to achieve its fully automated welding.

There are also some innovations in the industry, that is, using a three-dimensional robot to drive the soldering iron for positioning welding, which can solve the solder joints of the same plane to a certain extent, and at the same time solve the quantitative control of the tin feeding and welding time, but the principle can not solve the metal structural parts. The endothermic effect brought about by the resulting solder joint Reliability issues.

Summary of the invention

The object of the present invention is to provide a non-contact heating tin brazing method for metal structural parts and hardware which improves welding efficiency and ensures welding quality.

In order to achieve the above object, the present invention provides the following technical solutions:

A non-contact heating tin brazing method for a metal structural member and a hardware, comprising an integral heating welding device having a transmission system, a heating system disposed along a direction of movement of the workpiece, and a cooling system, the method comprising the steps of: Presetting the workpiece and transferring the workpiece to a heating system, the workpiece comprising a pre-assembled structure of the metal structural member and the hardware, solder pre-set at the solder joint between the metal structural member and the hardware, and positioning for pre-assembly The structure of the revolving fixture; the non-contact heat radiation heating of the workpiece, so that the solder at the solder joint is fully melted; the workpiece is heated and welded to cool, so that the solder joint is quickly solidified.

Further, the method further includes a pre-assembly process of the workpiece, specifically comprising the steps of: preparing the metal structural member and pre-positioning it on the revolving jig; assembling the hardware on the metal structural member, and pre-tightening the two; The solder is preset at the solder joint between the structural member and the hardware.

Preferably, the solder is added to the solder joint between the metal structural member and the hardware by a three-dimensional solder automatic adding device.

Preferably, in the non-contact heat radiation heating step of the workpiece, the heating temperature and the heating time of the heating system are set such that the heating system heats the workpiece according to the preset heating parameter.

Further, temperature zone stratification control is performed on the heating zone such that the temperature difference between the metal structure body and the solder joint is within 5-10 °C.

The method further includes a subsequent step, specifically comprising: removing the finished finished product from the turnover jig and returning the revolving jig through the transmission system.

Compared with the prior art, the solution of the invention has the following advantages:

1. In the tin brazing method of the present invention, since the welding device is fixed, the solder is added, and the heating and welding are separated, different processes are set up and fine management is performed, which facilitates automatic welding process, realizes modular management, and improves welding. Efficiency, guarantee welding quality.

2. The tin brazing method of the present invention adopts a non-contact integral heating welding scheme, and a guarantee deposit It is a soldering temperature uniformity and constant temperature of the structural parts; it is controlled by the program to meet the characteristics of the tin solder, ensuring the fluidity of the solder and the strength of the solder joint formation.

3. The tin brazing method of the invention adopts a non-contact integral heating welding scheme, adopts a parameter control function, and the welding time is obtained with very precise control, and the welding quality is ensured.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing the overall heating of a workpiece of the present invention in an overall heating and welding apparatus.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

The non-contact heating tin brazing method (hereinafter referred to as "tin brazing method") of the metal structural member and the hardware of the invention mainly comprises a preset workpiece (including solder addition), a non-contact heating workpiece, a cooling workpiece, and a disassembly workpiece In the four major steps, the welding process is fixed, soldered, and heated and welded to set up different processes and finely control them, which facilitates the automatic completion of the welding process and realizes modular management.

Among them, the solder is added in the stereo soldering automatic adding device, which can realize the synchronous multi-point addition of the solder at the solder joints of many required soldering, so that the solder has accurate quantification and the solder shape is moved to ensure the welding process. The flow distance of the solder is consistent.

As shown in FIG. 1, the non-contact heating is performed in the integral heating and welding device 1, which has a transmission system for conveying a workpiece and sequentially sets a heating system and a cooling system along the workpiece transmission direction, and is used for the heating system. For 360 degree thermal radiation of the workpiece, The product can be uniformly heated in each orientation and position, so that the solder on the solder joint is fully absorbed and melted, and then wetted and flowed between the metal structural member 2 and the

solder joints

3 and 4 of the hardware, and then proceeded. Cooling causes the liquid solder at the solder joint to solidify rapidly to form the desired solder joint.

The tin brazing method specifically includes the following steps:

Presetting the workpiece onto the drive train and transferring the workpiece to the heating system;

The workpiece includes a pre-assembled structure of the metal structural member 2 and the hardware, a solder pre-set at a solder joint between the metal structural member and the hardware, and a revolving jig for positioning the pre-assembled structure. The revolving jig has a limit and positioning function, is resistant to high temperatures and can be used for simultaneous limiting and positioning of a plurality of semi-products.

The workpiece is subjected to non-contact heat radiant heating so that the solder at the solder joint is sufficiently melted. In the present invention, the workpiece is subjected to omnidirectional heat radiant heating by the above-mentioned integral heating welding device, so that the solder joint is fully absorbed by heat, and the wetting, flowing and element diffusion are performed between the joints of the metal structural member and the hardware.

The workpiece that is heated and welded is cooled, so that the solder joint is rapidly solidified, and the entire non-contact tin soldering is completed.

Further, the pre-assembly process of the workpiece is further included, which specifically includes the following steps:

Preparing the metal structural member and pre-positioning it on the turnover jig;

Mounting hardware on the metal structural member and pre-tightening the two; wherein the metal structural member has a concave structure, the hardware is embedded in the concave structure of the metal structural member, and is biased by a high temperature resistance The tool realizes the pre-tightening of the two, and the gap between the metal structural member and the hardware is less than 0.1 mm. In addition, the pre-tightening tool can prevent the object itself from failing due to the thermal expansion and contraction effect due to its high temperature resistance.

The solder is preset to the solder joint between the metal structural member and the hardware. Preferably, in the present invention, the solder is added to a solder joint between the metal structural member and the hardware by a stereoscopic solder automatic adding device.

Preferably, the temperature zone stratification control is performed on the heating zone, so that the temperature difference between the metal structure body and the solder joint is within 5-10 ° C, which ensures the plating layer and the soldering temperature requirement of the hardware.

Further, the subsequent steps after the completion of the welding include: removing the finished finished product from the turnover jig, and returning the revolving jig through the transmission system to complete a complete single cycle process.

The above is only a part of the embodiments of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

A non-contact heating tin brazing method for a metal structural member and a hardware, characterized in that it comprises an integral heating welding device having a transmission system, a heating system disposed along a direction of movement of the workpiece, and a cooling system, the method comprising the steps of:

Presetting the workpiece to the transmission system and transferring the workpiece to the heating system, the workpiece comprising a pre-assembled structure of the metal structural member and the hardware, a solder pre-set at the solder joint between the metal structural member and the hardware, and To locate the pre-assembly structure of the revolving fixture;

The workpiece is subjected to non-contact heat radiation overall heating, so that the solder at the solder joint is sufficiently melted;

The workpiece that is heated and welded is cooled so that the solder joint is rapidly solidified.
The non-contact heating tin brazing method for a metal structural member and a hardware according to claim 1, further comprising a pre-assembly process of the workpiece, specifically comprising the following steps:

Preparing the metal structural member and pre-positioning it on the turnover jig;

Assembling the hardware on the metal structural member and pre-tightening the two;

The solder is preset to the solder joint between the metal structural member and the hardware.
The method of non-contact heating tin brazing of a metal structural member and a hardware according to claim 2, wherein the solder is added to a solder joint between the metal structural member and the hardware by a three-dimensional solder automatic adding device.
The non-contact heating tin brazing method for a metal structural member and a hardware according to claim 1, wherein in the non-contact heat radiation heating step of the workpiece, the heating temperature and the heating time of the heating system are set. The heating system heats the workpiece according to preset heating parameters.
The non-contact heating tin brazing method for a metal structural member and a hardware according to claim 4, wherein the heating zone is subjected to temperature zone layering control such that a temperature difference exists between the metal structural component body and the solder joint.
The non-contact heating tin brazing method for a metal structural member and a hardware according to claim 1, further comprising a subsequent step, comprising: removing the finished finished product from the turnover jig and returning through the transmission system Pass the turnover fixture.