CN104972224A

CN104972224A - Automatic tin soldering method

Info

Publication number: CN104972224A
Application number: CN201410138982.0A
Authority: CN
Inventors: 不公告发明人
Original assignee: SICHUAN ANHE PRECISION ELECTRONIC ELECTRICAL APPLIANCES Co Ltd
Current assignee: Sichuan Awa Seimitsu Electric Co ltd
Priority date: 2014-04-09
Filing date: 2014-04-09
Publication date: 2015-10-14
Anticipated expiration: 2034-04-09
Also published as: CN104972224B

Abstract

The invention discloses an automatic tin soldering method. The characteristic that the absorption rate of copper wires to laser is decreased along with increasing of the laser wavelength is utilized, and a segment of laser with the specific wavelength is selected to irradiate the tin soldering welding position of the copper wires; and insulation layers on the copper wires automatically fall off and are perfectly welded with soldering tin. According to the implementation, in the welding process, a traditional welding machine, traditional soldering tin bars and traditional rosin are not needed, and the welding position obtained after welding is not required to be cleaned; the production efficiency is improved, and meanwhile the problem of the copper wire fusing rate caused by traditional welding is solved; and the method is environment-friendly and economical.

Description

A kind of automatic tin soldering method

Technical field

The present invention relates to welding field, relate in particular to the welding method that accurate device adopts scolding tin.

Background technology

At present, smart mobile phone market share amount is in continuous expansion, and corresponding vibrating motor for mobile phone market share amount is also in increase; Meanwhile, mobile phone is towards miniaturization, and ultrathin future development, it is also proposed new demand to the paster motor that it uses: i.e. ultra-thin superminiature, and can equally realize standardized production manufacture with other electronic devices and components.For this reason, according to market demands, motor volume has been accomplished industry is minimum, the most I of thickness is low to moderate 3.4mm.But the thing followed is that a series of technical difficult point needs to break through, wherein the most outstanding is because the conductor wire diameter minimum (only having 0.025mm) used, the following result caused under traditional mode of production.

Traditional welding manner is all adopt manually welding, need in welding process to use electric iron, solder horn, the equipment such as solder, and must human weld be adopted in welding process, and soldered object such as mobile phone electro-motor belongs to accurate device, therefore in welding process, very high demand is proposed to the control of temperature and the assurance of pad, and because the temperature of electric iron belongs to constant, can not precise hard_drawn tuhes, adding the uncertain factor that manual operation causes, a large amount of welding situations excessively can be caused, that is pad is because weld interval is long or the too high situation causing soldered copper wire to occur broken string of temperature.

In order to control the series of problems occurred in welding process; particularly improve the problem of copper wire broken string; so just can only reduce the scolding tin temperature of pad; because along with the dissolution rate of the rising copper of scolding tin temperature also progressively raises, but because welded contact has dielectric film to protect, if reduce the temperature of scolding tin in welding; dielectric film can not be removed; can not reach welding effect again, the temperature of therefore welding to reduce, and temperature can not reduce and just fundamentally can't resolve problem.

Simultaneously because adopt the mode of human weld, need a large amount of man power and materials just can meet the needs of production, substantially a sealing wire needs more than 6 people, and after welding welded contact also being existed to the problem of cleaning, the rosin produced in cleaning process and scolding tin and water also can to environments.Therefore need a kind of new welding method of research and development to replace traditional scolding tin welding method.

Laser, be a kind of well-known technology, along with the development of modern industrial technology, laser is employed for every field, particularly utilize laser can produce a large amount of heats to weld object, soldered object is also generally the object because adopting normal welding means effectively not weld.

Summary of the invention

The object of this invention is to provide a kind of automatic tin soldering method, solve at present in the welding process of accurate device, the situation of the welding process interrupt line occurred when particularly soldered brass wire diameter is little especially;

Further object realizes automatic welding in welding process, avoids the industrial pollution occurred in human weld's process, improves welding efficiency.

The technical solution used in the present invention: a kind of automatic tin soldering method, described tin-soldering method comprises two steps:

Step one: the rotor winding copper wire is placed, adjustment laser head, determines laser spot position, open lasing light emitter, regulate the wavelength of laser, make laser be radiated at copper wire place on rotor substrate, copper wire absorbing laser produces heat, and the dielectric film on copper wire is split automatically;

Step 2: laser continues to be radiated at and removes the copper wire of dielectric film and the junction of substrate, the heat that copper wire absorbing laser produces makes the scolding tin fast melt on substrate and merges with the copper wire on substrate, completes welding.

In technique scheme, the wave-length coverage of described laser is 234 nm ~ 500nm.

In technique scheme, described sharp light-struck time is 0.05ms.

In technique scheme, the substrate of described rotor is coated with one deck soldering-tin layer.

In the present invention, have employed laser welding technology, instead of traditional manual welding, analyze from laser itself, we know that the absorptivity of metal pair laser is the wavelength change with light, the wavelength of laser is longer, the absorptivity of metal pair laser is lower, laser absorption rate with reference to < metal material is studied the formula in > and calculates, as shown in Figure 2, copper increases with wavelength the absorptivity of laser and reduces, and wavelength is when 234 ~ 500nm, and absorptivity can reach more than 50%.

If continue the wavelength reducing laser, although the absorptivity of copper to laser can be improved, but copper cash can be caused to be rapidly heated because absorb too many laser, too high temperature can make copper cash corrode in solder liquid, there is the problem the same with in manual welding process, therefore must control the wavelength of laser, and swash light-struck time.Same, if the wavelength of laser is too short, must reduce sharp light-struck time, and to the control time of laser be all generally and short, proposing too high requirement to the control time is that current industrial equipment is inaccessiable.Therefore optical maser wavelength is selected in this programme between 234 nm ~ 1000nm.

Wavelength is between 500 nm ~ 1000nm, copper is very low to the absorptivity of light, when wavelength is at 532nm, the heat that the laser of Copper uptakie produces can make the dielectric film be coated on copper wire burst out instantaneously, and can not copper wire be injured, and wavelength is when 500 nm ~ 532nm, the heat of copper transient absorption does not reach the temperature of melting scolding tin yet, and therefore this wavelength period is the best opportunity of sloughing dielectric film.

When wavelength is in 234 nm ~ 500nm, along with copper increases the absorptivity of laser, the temperature of copper wire is climbed to more than 200 degrees Celsius, and this temperature section can make rapidly scolding tin melt, and the tin soldering liquid after thawing by copper wire Bao Rong together, namely completes welding.In this process, wavelength is the laser beam emitting device of 234 nm is the minimum wavelengths that can reach in current laser welding machine, and be the irradiation time that must control laser in welding process, the time is decided to be 0.05ms, if the amount of heat that overlong time produces also can cause copper cash to fuse.

In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows: improve traditional manual welding process, soldered place only needs to carry out twice laser and irradiates and can complete welding, and by the optical maser wavelength in control procedure and time, effectively control the temperature at soldered place, make the dielectric film Automatic-falling on copper cash and perfectly merge with scolding tin, avoid the copper cash of the too high appearance of Yin Wendu to fuse.

Further advantage is by implementing this programme, can completing the automatic production on production line, by adopting corresponding automation equipment, only needing a people just can control, greatly reducing the input of human resources, enhance productivity.

Be in further advantage, traditional manual welding, because adopt soldering tin bar and rosin, a large amount of air pollutants can be produced, welding simultaneously terminates to pollute environment the residue that soldered place is cleaned afterwards, and the welding of this programme, can not relate to and use soldering tin bar and rosin, welding simultaneously does not need to clean after terminating yet, and therefore the welding engineering of this programme can not produce substantially to environment and human harmful substance.

Accompanying drawing explanation

Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:

Fig. 1 is the partial enlarged drawing of motor rotor;

Fig. 2 is the absorptivity chart of metal pair laser.

Detailed description of the invention

All features disclosed in this description, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.

As shown in Fig. 1, the present invention's welding to as if electro-motor on mobile phone or mobile digital product, the core component of motor is exactly the rotor of the inside, a large amount of thin copper wires is regularly wrapped above each rotor, the surface of copper wire is all covered with one deck dielectric film, and the soldered place 1 in Fig. 1 is that thin copper wire is wrapped on the substrate of rotor, in the present invention, substrate does corresponding process, the surface of substrate has been coated with one deck scolding tin before winding copper wire.After winding thin copper wire, just can directly weld.

Because the copper wire welded in the present invention is quite thin, diameter only has 0.025mm, and in order to better control welding precision, the present invention selects and existingly wavelength can be reduced to minimum laser-beam welding machine at present, welds soldered place.

Ready rotor is put into automatic welding equipment, regulates the position of the laser head of laser machine, determine pad, regulate the relative position of rotor, fixed rotor; According to the position of Laser Welding contact, suitably regulate the position of rotor and laser head, preferably can become miter angle, the observation after handled easily person can weld; Be ready to start welding.

During welding, the wavelength of laser will control between 234 nm ~ 523nm, wavelength period between 500 nm ~ 523nm is insulating barrier Automatic-falling on copper wire, and the wavelength period between 234 nm ~ 500nm melts welding for scolding tin, the time of welding will control in 0.05ms, if exceed this time, the heat that copper cash absorbs can cause copper wire to be corroded in tin soldering liquid, causes last copper cash to break.Therefore the present invention selects wavelength to be the laser of 234 nm ~ 500nm, disposable welding is carried out to soldered place, the laser of this wavelength can melt temperature being elevated to instantaneously scolding tin the temperature needed, and this temperature also can make dielectric film oneself take off instantaneously simultaneously, finally completes welding.

Adopt the present invention to carry out factory's effect, a production line only needs a set of automatic welding equipment, not solder horn, not tin soldering machine, not solder, and a workman can operate; Maintain cleaning after rotor scolding tin after welding, no longer need cleaning machine or rinse water, decrease the discharge of waste water, more environmental protection, provide operating efficiency, saved production cost, huge economic benefit can be brought.

The present invention is not limited to aforesaid detailed description of the invention.The present invention expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.

Claims

1. an automatic tin soldering method, is characterized by described tin-soldering method and comprises two steps:

2. a kind of automatic tin soldering method according to claim 1, the wave-length coverage that it is characterized by described laser is 234 nm ~ 500nm.

3. a kind of automatic tin soldering method according to claim 2, it is characterized by described sharp light-struck time is 0.05ms.

4. a kind of automatic tin soldering method according to claim 1, the substrate that it is characterized by described rotor is coated with one deck soldering-tin layer.