Solder application reachs laser sensor its receive a technology

Time:2023-06-21 12:39:01
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source:LENA CNC Machining

Laser beam welding receives a technology is a kind of new and high technology, as a result of its particular characteristic, suit to be used in sensor close soldering and sealing particularly, at present a lot of manufacturer that produce sensor all use abroad laser beam welding receives craft to produce sensor, and the manufacturer that home uses this technology is not much, the sensor of our country produces manufacturer to should use homebred laser beam welding to receive engine a future life to produce treatment sensor as soon as possible, in order to increase product competition ability, development international market. One, sensor basis national level GB7665-87, sensor definition is: Be measured what can experience a regulation and become the unit of parts of an apparatus of usable output signal according to certain regular changeover. Sensor serves as detect tool, the requirement detects the physics that studies a target or chemical information, its job process asks stable, reliable, precision is tall, have the following demands to sensor so: (1) get used to strong sensor of harsh environment ability general work environment is very wide, from extremely cold to broiling area, a lot of is in below outdoor environment the job, can fight flying sand to visit stone, speck, still answer humidity, taller fight salt kind corrode, the ability that acidity corrodes, have the capacity that fights contaminative gas interference, can get used to the ability in extremely high temperature, cold, intense vibration, concussion and regular below other condition job, still should fight noise ability strong, letter a confusion of voices is compared tall. (2) price moderate, comfortable good at consistency of sensor of demand of big batch production, appropriate automation batch is produced, have higher demand to machining equipment, so that eliminate,operate brought abhorrent sex and error artificially. (3) stability and dependability tall sensor are testing instrument of a kind of high accuracy, in military affairs, aviation, spaceflight application has firm demand, the product needs a course to check ability application strictly. So sensor production is a kind of new and high technology is specific apply and reflect. The technology that whether a kind of sensor has the technical content that additional cost reflects higher technology to be included in place and treatment technology is new and high. The state that because its apply an environment,has partial sensor needs a metal to enclose, use commonly solder sealed, wait like sensor of sensor of sensor of pressure sensor, force transducer, suddenly Er, photoelectricity, temperature, interior of this kind of sensor has sensing element and integrated circuit, fill inert gase or vacuumize and outside isolation, have demand of compression, air-tightness, have additionally solder strength demand and flat rate requirement, to soldering quality asks tall, and solder the requirement in the process is out of shape small, cannot have damage to in-house component and microcircuit. At present sensor close soldering and sealing is received have solder of arc of argon of resistance welding, tungsten pole, plasma arc solder, electron beam solder and laser beam welding. 2, laser beam welding is received 1.

Laser beam welding receives principle laser is radiant suffers the abbreviation that arouses enlarge ejaculation light, as a result of sex of its particular tall brightness, tall directional, tall monochromatic, tall coherence, since be born, its process medium application in industry very extensive, become future to make the process instrumentation with joint system. Using laser beam welding to receive treatment is the laser that uses tall radiate strength bundle, after stimulating beam of light to pass optical system focusing, the power density of its laser focus is 104~107W/cm2, treatment undertakes heating fusing near focus of workpiece park laser, fused phenomenon whether the strong weak pitch of generation and generation basically depends on density of the time of surface of laser action material, power and peak value power. Control afore-mentioned each parameter to solder with respect to what can use laser to undertake all sorts of differring treatment. 2.

The common characteristic laser beam welding that laser beam welding receives is received is use the technology of a kind of hot-working that stimulates beam of light to serve as heat source, it and electron beam plasma bundle compare with general machining photograph, have a lot of advantages: The laser focus facula that stimulates beam of light is small, power density is high, can solder the alloy material of a few high melting point, high strenth. Laser beam welding is received is not to have a contact to machine, wait for a problem without tool loss and tool exchange. Stimulate energy of beam of light adjustable, floating rate is adjustable, a variety of OK soldering treatment. Laser beam welding receives automation rate tall, can undertake controlling with the computer, solder rate is rapid, effect is tall, can have any complex figure expediently solder. Laser beam welding receives hot effect the area is small, material is out of shape small, need not processing of follow-up working procedure. Laser can pass vitreous weld to reach the workpiece that is in position of complex structure interior at the workpiece inside vacuum container. Stimulate beam of light to direct easily, focusing, realize each direction commutation. Laser solders to be compared with electron beam treatment, do not need rigid vacuum equipment system, the operation is convenient. Deliver a child of laser beam welding produces efficiency tall, treatment quality is stable and reliable, economic benefits and social benefit are good. Nextpage 3.

Laser solders to produce medium craft characteristic in sensor. It is current that laser uses case of metal of sensor of soldering and sealing a kind of the most advanced treatment technique, basically be based on laser beam welding to receive have the following characteristic: (1) is tall deep wide than. Welding line is dark and narrow, welding line brightness is beautiful. (The smallest heat inputs 2) . Because power density is high, fused process is splitting, input workpiece quantity of heat is very low, solder rate is rapid, heat is out of shape small, hot influence area is small. (3) is tall compact sex. Welding line builds a course in, bath is ceaseless agitate, gas goes out easily, bring about generate show welding line without stomatic frit. The high cooling rate after solder makes welding line organization is changed imperceptibly easily again, welding line intensity, tenacity and integral performance are high. (4) strong welding line. High temperature heat source and rarefied to drawing generation adequately of metalloid group share action, reduced matter content, dimension of change be mingled with and its distributing mediumly in bath, solder in the process need not electrode or fill welding wire, fused area gets pollution small, make welding line intensity, tenacity is equivalent to exceeding metal of the mother's body even at least. (5) is controlled accurately. Because focusing facula is very small, welding line is OK high accuracy fixed position, beam of light is transmitted easily with control, do not need to often change solder fire, nozzle, decrease significantly stop machine is auxiliary time, manufacturing efficiency is tall, light is not had inertial, still can stop urgently below high speed and open afresh only then. With accuse beam of light to move oneself technical criterion but solder is complex component part. (Environment of 6) blame contact, air solders process. Because energy comes from laser, workpiece does not have physical contact, because this does not have force,bring to bear on at workpiece. Additional magnetism and air do not have an influence to laser. (Because 7) makes the same score soaking the input is low, treatment precision is tall, can reduce rework cost, additional, laser beam welding receives locomotive fee inferior, can reduce workpiece cost thereby. (8) implements automation easily, to beam of light intensity and careful fixed position can undertake be controllinged effectively. 3, laser beam welding receives with existing solder of the method more current sensor close soldering and sealing receives used method to have: Solder of arc of resistance welding, argon, report bundle of solder, plasma solder. 1.

Resistance welding: It is used solder thin metal, between two electrode clamp is passed by solder workpiece the surface that big electric current fuses electrode is contacted, give out heat through workpiece resistor namely will carry out solder. Workpiece is changeful form, resistance welding passes seam of contact both sides, and laser beam welding undertakes from unilateral only, resistance welding place needs to often be safeguarded with electrode with cleared oxide and the metal that wear from workpiece adhesion, workpiece is not contacted when laser beam welding receives thin metal lap joint, moreover, beam of light returns accessibility groovy solder hard the area that solder reachs, solder rate is rapid. 2.

Argon arc solder: Use blame uses up electrode and protective gas, commonly used will solder poor work, but solder rate is slower, and hot input is a lot of bigger than laser beam welding, easy generation is out of shape. 3.

Plasma arc solder: As similar as argon arc, but its solder fire can arise compress electric arc, in order to raise arc gentle energy density, it compares rate of argon arc solder fast, frit is deep big, dan Xun at laser beam welding. 4.

Electron beam solder: It relies on a bundle to quicken high-energy density electron to flow bump workpiece, in workpiece surface very small accumulate closely inside the heat with huge generation, form effect of " alveolus " , carry out deep fusion welding to receive thereby. The main drawback of electron beam solder is environment of need high vacuum in order to prevent electronic scattering, equipment is sophisticated, weldment dimension and appearance get the limitation of vacuum room, to Han assemble quality the requirement is strict, solder also can carry out blame vacuum electron beam, but as a result of electronic scattering focusing is bad to affect the result. Electron beam solder still has magnetism deflection and X ray problem, because the electron is electrified, can suffer effect of magnetic field deflexion, reason asks the demagnetization before solder of workpiece of electron beam solder is handled. X ray is particularly strong below high pressure, need to carry out protection to operating personnel. Laser beam welding does not need vacuum room and processing of demagnetization of ongoing to workpiece solder travel, it can undertake in atmosphere, also did not prevent X ray problem, can be so inside product line online operation, also can solder magnetic material. 4, laser beam welding receives the applied foreground laser beam welding that produces in sensor to receive a technology is a kind of new and high technology, as a result of its particular characteristic, suit to be used in sensor close soldering and sealing particularly, at present a lot of manufacturer that produce sensor all use abroad laser beam welding receives craft to produce sensor, and the manufacturer that home uses this technology is not much, the manufacturer that basically is product of sensor of for military use of a few production and orgnaization of partial scientific research are using this kind of technology, and use foreign laser beam welding to receive of machine more. At present domestic laser solders machine already differred with foreign product on function not far, can be competent completely the craft requirement of domestic production sensor, but the 1/3-1/5 that the price is foreign congener product. To improve level of domestic sensor whole and industry of development nation laser, the sensor of our country produces manufacturer to should use homebred laser beam welding to receive engine a future life to produce treatment sensor as soon as possible, in order to increase product competition ability, development international market. CNC Milling