CN103357981A - Rotation type reflow soldering furnace and soldering method thereof - Google Patents
Rotation type reflow soldering furnace and soldering method thereof Download PDFInfo
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- CN103357981A CN103357981A CN 201210083102 CN201210083102A CN103357981A CN 103357981 A CN103357981 A CN 103357981A CN 201210083102 CN201210083102 CN 201210083102 CN 201210083102 A CN201210083102 A CN 201210083102A CN 103357981 A CN103357981 A CN 103357981A
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Abstract
A rotation type reflow soldering furnace comprises a furnace body, a furnace door, an impeller, a rotation control device, a tray, a tray position adjusting device, a vacuum pump and a temperature controller. The rotation type reflow soldering furnace is characterized in that the furnace body is formed by intersection of a cylinder and a cuboid equal in height, the furnace door is arranged on the wall of the furnace body, the furnace body is divided into a loading zone, a heating zone, a buffering zone and a cooling zone, a hot plate is arranged in the heating zone, a cold plate is arranged in the cooling zone, the impeller is arranged in the furnace body and connected with the rotation control device in a circuit manner, a to-be-soldered electronic component and a solder tray are placed between two blades, a vacuum pipe is connected with the heating zone via a pipeline, and the temperature controller is connected with the hot plate and the cold plate via circuits. The rotation type reflow soldering furnace has the advantages that the rotation type reflow soldering furnace has an independent heating system and an independent cooling system, and can perform non-interfering heating and cooling processes in a vacuum or protective atmosphere, repeated heating and cooling is not needed, and accordingly soldering time can be saved, power consumption is reduced, and working efficiency and soldering quality are improved.
Description
Technical field
The present invention relates to a kind of welding equipment and method, particularly a kind of reflow soldering furnace and welding method thereof.
Background technology
Along with the electronic devices and components package dimension day by day dwindles, power grade day by day increases, to arising at the historic moment without the demand of cavity welding.Owing under the environment of few oxygen or anaerobic, welding, can reduce the generation in cavity in the welding process and then improve the quality of welding, correspondingly wish to make solder reflow process enough under the environment of few oxygen or anaerobic, to carry out.And present reflow soldering furnace welds under atmospheric environment mostly, and the generation in cavity is uncontrollable, and the quality of welding is not high.
In addition, for small-sized reflow soldering furnace of the prior art, generally be the whole process of reflow soldering that in a cavity space, realizes.Each welding job all needs to be heated to welding temperature from room temperature, is reduced to room temperature from welding temperature again.Carry out multiple welding, will carry out repeatedly temperature thermal shock.At first, frequently heat up and cooling can cause a large amount of losses of energy; Secondly, this itself causes temperature stress can bring fatigue damage to reflow soldering equipment; Moreover heating up and lowering the temperature to spend many times, has reduced welding efficiency.And for big-and-middle-sized reflow soldering furnace of the prior art, generally adopt the multi-region welding, and be divided into preheating zone, heat preservation zone, weld zone and cooling zone, adopt pile line operation in the welding process.But the thermal treatment zone and cooling zone communicate, and cold and hot air can influence each other or mix, and this is to originally wanting to obtain thermal environment or cold environment has just produced adverse influence.This has also affected the heating and cooling temperature field, and has caused certain energy loss.
Therefore, for the vacuum back-flow soldering furnace of present existing structure, owing to being to adopt radiation to carry out the heat transmission mostly, its convection heat transfer' heat-transfer by convection is strong or do not have heat convection, has the shortcoming that radiation heating conducts heat slowly, efficient is lower.And these structures are difficult to carry out reflow soldering under vacuum or protective atmosphere, because carrying dress and taking out of the welded part in the streamline welding can't guarantee that all welding equipment forms vacuum environment and protective atmosphere environment.In this case, be necessary to develop the reflow soldering furnace that can adopt other mode of heatings and realize expediently vacuum or protective atmosphere by structural configuration.
Summary of the invention
The objective of the invention is for the defective that exists in the prior art, a kind of rotary reflow soldering furnace is provided.The present invention includes: body of heater, fire door, impeller, rotating control assembly, pallet, the tray position adjusting device, vavuum pump, temperature controller, it is characterized in that described body of heater is crossed by contour cylinder and cuboid forms, the center line of cuboid and cylindrical dead in line, the width of cuboid is less than cylindrical diameter, the length of cuboid is greater than cylindrical diameter, cylindrical bottom surface is a border circular areas, this border circular areas is the sector region of four equal area sizes, furnace body wall is provided with fire door, the sector region of pressing close to fire door is loading area, the sector region at loading area diagonal angle is buffering area, the zone of all the other both sides, one side is the thermal treatment zone, and opposite side is the cooling zone, is provided with one in the thermal treatment zone and is used for hot plate that electronic devices and components and scolder are heated.Be provided with one in the cooling zone and be used for cold drawing that electronic devices and components and scolder are cooled off, be provided with an impeller in the body of heater, impeller is connected with the rotating control assembly circuit, the radius of the radius of impeller and cylinder body of heater is almost identical, be provided with between two blades be used to placing electronic devices and components to be welded and the pallet of scolder, welded part is positioned on the pallet at loading area, be warmed up to welding temperature from the loading area rotation to the thermal treatment zone and carry out reflow soldering, pallet height is by tray position adjusting device up-down adjustment, tray position can be adjusted to the position of closely touching with hot plate and cold drawing, vavuum pump is connected with the thermal treatment zone through pipeline, to guarantee forming vacuum state in the stove, after welding was complete, welded part and pallet rotation arrived the cooling zone again through buffering area, stop a little, turn back to again loading area after being cooled to normal temperature, rotate a circle, finish once welding, the electronic devices and components that welding is good take out from loading area.Temperature controller is connected with hot plate, cold drawing through circuit.
Hot plate is fan-shaped, its fan-shaped angle is less than 90 degree, the thermal treatment zone comprises the sector region at hot plate place and near the furnace bottom plane domain outside this sector region camber line, hot plate is arranged on the sector region center of loading area one side, is used for electronic devices and components and scolder are heated.Cold drawing is fan-shaped, its fan-shaped angle is less than 90 degree, the size the same with hot plate, the cooling zone comprises the sector region at cold drawing place and the furnace bottom plane domain in close this sector region camber line outside, cold drawing is arranged on the sector region center of loading area opposite side, is used for electronic devices and components and scolder are cooled off.
Described impeller is provided with four blades, the blade material of impeller is made by the heat-insulating material with rigidity, four cut-off rules that blade vertically is projected in four sector regions of the long line segment of leaf and furnace bottom on furnace bottom plane overlap, four blades have separately formed four functional areas to the space in the furnace chamber, namely load zone, heating region, buffer area and cooled region, impeller drives through rotating control assembly and rotates around impeller shaft.Impeller rotates to the position of 90 degree, 180 degree, 270 degree and 360 degree successively.Impeller will enter into respectively the thermal treatment zone, buffering area and cooling zone with electronic devices and components and scolder, gets back at last original initial position loading area.So just electronic devices and components have been brought into the different soldering stages with welding.
Described pallet is made by graphite material, and for removably is fixed on the impeller, pallet drives along the axis direction of impeller shaft through the tray position adjusting device and moves up and down the distance between adjusting tray and hot plate or the cold drawing.Pallet is moved up and down along the axis direction of impeller shaft, and pallet rotates with the rotation of impeller, but the position of its circumferential direction is relative with flabellum fixing, can not move.Because pallet made by graphite material, can low cost and thermal uniformity realize well heat conduction or heat radiation between itself and the hot plate.The characteristics that graphite material has is high temperature resistant, thermal expansion is little, heat transfer property is good.
Described impeller has a plurality of wheel blades, is tight fit between itself and the body of heater cylindrical inner wall face, is provided with the flexible material of sealing function between the outboard end edge of impeller blade and the body of heater cylindrical inner wall face.
Described hot plate is by Resistant heating or electrothermal tube heating arrangement, and the heating power of hot plate is regulated by temperature controller, and hot plate is arranged in the heating region.
Described cold drawing is by water-cooled or cooled with liquid nitrogen mode, and cold drawing is made by the metal material of good heat conductivity, and cold drawing inside is provided with the snake pipe for the cooling fluid circulation.
Temperature controller can be regulated the heating power of hot plate, and same, temperature controller also can be regulated the flow of the cooling fluid in the cold drawing cooling pipe.Owing to having adopted temperature controller to control heating and cooling, having increased the convenience of the operation of reflow soldering furnace.Described vavuum pump is to link to each other with the residing zone of described hot plate.
The welding method of rotary reflow soldering furnace comprises the following steps: successively
Impeller is resetted, open fire door in the situation that impeller is in initial position, object to be welded is positioned in the pallet of loading area, then close fire door, keep the sealing of reflow soldering furnace;
B. making impeller drive pallet with respect to its initial position stops behind the 90-degree rotation together, object to be welded is threaded to heating region, this moment, vacuum pumping was carried out in the vavuum pump action, and pallet is adjusted to hot plate and contacts and be heated to welding temperature, carried out the reflow soldering operation;
C. make impeller continue to stop behind the 90-degree rotation along former direction of rotation, object to be welded is threaded to the buffer area, and its temperature remains unchanged;
D. make impeller again continue to stop behind the 90-degree rotation along former direction of rotation, object to be welded is threaded to cooled region, and this moment, cold drawing cooled off object to be welded, to finish the drop in temperature operation in the reflow soldering;
E. make impeller again continue to stop behind the 90-degree rotation along former direction of rotation, object rotation to be welded is back to loading area, and object to be welded was finished to weld and finished overall process this moment, opened fire door and took out the finished product weldment.
Advantage of the present invention is that the body of heater interior zone is separated into four isolated areas, has independently heating system and cooling system.Impeller can pass through loading area, the thermal treatment zone, buffering area and cooling zone successively under turning effort, thereby realizes that different processing procedures namely loads stage, heating period, buffer stage and cooling stage.Compare with the furnace binding of prior art, the present invention possesses independently heating system and cooling system, and heating and cooling do not interfere with each other, and need not repeatedly to heat up and lower the temperature, and has saved weld interval, has also saved the energy.It can carry out the continuous welding of pile line operation, and can also guarantee the work under vacuum or protective atmosphere, and prior art can't accomplish can also remain under vacuum and the protective atmosphere in streamline welding and welds.So not only reduce empty generation and improved the quality of welding, and can also continuously carry out welding operation.It can also be applied to during the various reflow solderings such as large-scale, medium-sized and small-sized produce, and the scope of application is large.In addition, because the contact heat transfer type that adopts radiation and heat conduction to combine has improved efficiency of utilization.
Description of drawings
The major function assembly floor map of the rotary reflow soldering furnace of Fig. 1;
Fig. 2 vane rotary schematic diagram;
The structural representation of the rotary reflow soldering furnace of Fig. 3;
The control device schematic diagram of the rotary reflow soldering furnace of Fig. 4.
Among the figure: 1 thermal treatment zone, 2 hot plates, 3 vavuum pumps, 4 impellers, 5 buffering areas, 6 cold drawings, 7 cooling zones, 8 bodies of heater, 9 loading areas, 10 fire doors, 11 pallets, 12 welded objects, 13 impeller shafts, 14 temperature controllers, 15 rotating control assemblies, 16 tray position adjusting devices.
The specific embodiment
Further specify the present embodiment below in conjunction with accompanying drawing:
Fig. 1 is the major function assembly plan view according to the rotary reflow soldering furnace of the present embodiment, as shown in fig. 1, the present invention is comprised of hot plate 2, cold drawing 6, impeller 4, pallet 11, vavuum pump 3, fire door 10, body of heater 8, object to be welded 12, temperature controller 14, rotating control assembly 15, tray position adjusting device 16 etc.The material of impeller 4 is made by the heat-insulating material with rigidity, such as the aluminum silicate ceramic material, has preferably heat-proof quality.Impeller 4 bottom border circular areas are divided into the sector region that four fan-shaped angles are the equal area size of 90 degree.And vertically being projected in four cut-off rules of four sector regions of the long line segment of the leaf on furnace bottom plane and furnace bottom, the blade of impeller 4 overlaps, four blades have separately formed four functional areas to the space in the furnace chamber, namely load zone, heating region, buffer area and cooled region, the sector region of pressing close to fire door 10 places is called loading area 9, with the sector region at loading area 9 diagonal angles are buffering areas 5, loading area 9 and buffering area 5 have just been divided two symmetrical side areas to furnace bottom area like this.The side area that comprises hot plate 2 is considered as the thermal treatment zone 1, comprises that the opposite side edge regions of cold drawing 6 is called cooling zone 7.Welded object 12 is loaded on the pallet 11, and pallet 11 is fixed on the impeller 4, and welded like this object 12 and pallet 11 are just along with impeller 4 rotates together.Impeller 4 drives pallet 11 in rotary course and object to be welded 12 passes through loading area 9, the thermal treatment zone 1, buffering area 5 and cooling zone 7 successively, can form the space sealing zone of relative closure therebetween with wheel blade 4.The thermal treatment zone 1 has also connected vavuum pump 3, is used for guaranteeing in heating, buffering and cooling procedure carrying out vacuum pumping in the reflow soldering furnace, and welding whole technological process is to weld under the environment of vacuum.In addition, open when fire door 10, can load object 12 to be welded, have sealing property when closing of fire door 10 can make reflow soldering furnace.Under vacuum, weld, can reduce the cavity that produces in the welding process as far as possible.
Fig. 2 is the wheel blade rotation schematic diagram according to the present embodiment.Impeller 4 drives pallet 11 and welded object 12 and rotates together when rotated.Impeller 4 phenomenon that some functional area is interconnected can occur in rotation process, but that the temporary transient situation that occurs in this rotary course can not continue is too of a specified duration, can not have influence on the use of reflow soldering furnace.Impeller 4 mainly is to rest on the functional area position (being loading area, the thermal treatment zone, buffering area and cooling zone) that coincides with four sector regions under the control of rotating control assembly 15, just longer in the specific functional area position time of staying, other position is the fast rotary mistake.For example when heating, impeller 4 rotations can make object 12 to be welded be transitioned into gradually the thermal treatment zone 1 from loading area 9, and this is a process that heats up gradually.Be tight fit between impeller 4 and the body of heater cylindrical inner wall face, be provided with the flexible material of sealing function between the outboard end edge of impeller blade and the body of heater cylindrical inner wall face, rub during rotation less, can keep air-tightness.Owing to the material of impeller is chosen as the heat-insulating material that possesses rigidity, can plays the effect of good heat-insulation and heat-preservation.In addition, show by the product practical proof, adopt the aluminum silicate ceramic material to make impeller, be convenient to production and processing and make, and can adapt to well the temperature shock effect that heating in the solder reflow process or cooling bring.Accurate cooperate very little with body of heater wall gap can be accomplished in the edge of wheel blade, and seals at the heat-resisting elastic fluid of the edge of wheel blade installation.
Fig. 3 is the three-dimensional cutaway view according to the rotary reflow soldering furnace of the present embodiment; when this soldering furnace carries out work; at first open the fire door on the loading area 9 10 in the body of heater 8; welded object 12 is placed on the pallet 11 between the impeller 4; close fire door 10, kept being in the stove environment of vacuum or protective atmosphere.Make impeller 4 counter-rotatings 90 degree to the position of the thermal treatment zone 1 at heating plate 2 places by rotating control assembly 15.Under the control of tray position adjusting device 16, pallet 11 drops to hot plate 2 and contacts, and during transmission of heat by contact, this thermaltransmission mode of heat conduction can account for leading, and radiant heat transfer is also arranged on every side.Welded object 12 is because action of gravitation also can be followed pallet 11 close contacts.Heat passes to welded object 12 from hot plate 2 by heat conduction.So the temperature of welded object 12 is elevated to welding temperature, just can automatically carry out reflow soldering.Temperature in the stove is delivered in the temperature controller 14 by the temperature transducer perception, realizes that control is to form the reflow soldering temperature curve of desirable temperature ascent stage.The upper surface of hot plate 2 can with the lower surface of pallet 11 close contact entirely, be conducive to thus carry out expeditiously heat conduction or cooling.Contact by the face between the pallet that keeps hot plate and loading stocks, product on the whole pallet can both be heated equably, the temperature of weldment substrate reaches first fusing point than the temperature of scolder in the assurance welding process, eliminate the condition that the cavity produces, can avoid thus traditional radiation heating to cause the light fast shortcoming of assembly temperature rising of quality.In the temperature uphill process of welded object 12, the outer vavuum pump 3 of stove is worked always, has guaranteed to be in all the time in the stove vacuum state.After the heating curve section had been welded, to 90-degree rotation, for the initial position of loading area 9, the Rotate 180 degree arrived buffering area 5 impeller 4 another mistakes, and the effect of buffering area 5 is that the thermal treatment zone 1 and cooling zone 7 are separated, and realizes the temperature keep-process of welding process.Wheel blade 4 again counter-rotatings 90 degree, for the initial position of loading area 9, rotation 270 degree, welded object 12 has been brought to cooling zone 7.By the control action of tray position adjusting device 16, pallet 11 is with cold drawing 6 close contacts, to increase the heat exchange efficiency of cold-zone 7.Chilling temperature is controlled, has formed the reflow soldering curve of descending branch.By cold drawing 6 being made by the metal material of good heat conductivity and its inside is set to the snake pipe of cooling water or liquid nitrogen process, when pallet 11 during with cold drawing surfacing ground close contact, distributes the purpose that reach cooling thereby so just be conducive to the Btu utilization heat-conducting mode by the adjusting of tray position adjusting device 16.And the speed size of cooling can be regulated and control by the flow in the control cold drawing internal pipeline, also can control by the distance of regulating 11 on cold drawing 6 and pallet.By cooling, when the temperature of welded object 12 was dropped to normal temperature, another impeller 4 rotated 90 ℃ again, and for the initial position of loading area 9, rotating 360 degrees has been got back to the position of initial loading area 9.Like this, welded object 12 just 7 has been transferred to loading area 9 from the cooling zone, opens fire door 10, takes out welded object 12.Rotate a week, finished the once overall process of welding.When carrying out pile line operation, guarantee to weld the loading of object and take out and constantly carry out, impeller 4 ceaselessly repeats above-mentioned welding process, just may realize continuously welding production.
Fig. 4 is the control device figure according to the rotary reflow soldering furnace of the present embodiment.Among Fig. 4, used the rotation of 15 pairs of impellers 4 of rotating control assembly accurately to control, the rotation of impeller 4 can be finished fast, and can be accurately positioned in the original state of loading area 9, be rotated counterclockwise the state of the thermal treatment zone 1 of 90 degree with respect to original state, be rotated counterclockwise the state of the buffering area 5 of 180 degree with respect to original state, and be rotated counterclockwise the state of the cooling zone 7 of 270 degree with respect to original state.Thereby impeller 4 is just furnace chamber four the cavity zones that separated self-assembling formation like this, i.e. the cavity at loading area 9, the thermal treatment zone 1, buffering area 5 and 7 places, cooling zone zone.Reflow soldering furnace has also adopted 16 pairs of hot plates 2 of temperature controller and cold drawing 6 to carry out temperature control.Temperature in the stove is delivered in the temperature controller 14 by the temperature transducer perception.Temperature controller 16 can be controlled the heater circuit of hot plate 2, and can advance to regulate to heating power.Simultaneously, temperature controller 16 also can be controlled the ducted flow of cold drawing 6, has so just automatically controlled the drop in temperature speed of cooling.Also have tray position adjusting device 14 among Fig. 4, be used for pallet is realized moving up and down adjusting aspect impeller shaft 13 axial, can regulate the distance between itself and hot plate 2 or the cold drawing 6, also can regulate itself and the tightness degree that contacts of hot plate 2 or cold drawing 6.Can improve like this rate temperature change of heat transfer efficiency and realization heating and cooling regulates.
General soldering furnace is easy to distortion owing to being in the state of colding and heat succeed each other always, and many parts need periodic replacement.In the soldering furnace of the present embodiment, need the just tray portion of loading stocks of variations in temperature, avoided whole heating system all will carry out cold cycling at every turn and changed, not only protected equipment, also significantly reduced power consumption.In addition, because pallet 11 removably circumferentially is fixed on the impeller 4, can repair or replace easily operation like this.
Therefore, the present embodiment has the independently thermal treatment zone 1 and cooling zone 7, and the thermal treatment zone 1 and cooling zone 7 do not interfere with each other, and can lay in respectively heat energy and cold energy, need not all to heat up in each welding and lower the temperature operation.The design of such special construction can bring a lot of advantages: it can reduce weld interval, and energy savings avoids the temperature thermal shock equipment to be damaged etc.In addition, owing to having the independently thermal treatment zone 1 and cooling zone 7, not in same cavity, to carry out heating and cooling, can avoid scaling powder gas to meet the condensation knot, can not affect the quality of welding, also can not cause the secondary pollution of product.When using weld tabs technique and adopting protective atmosphere, can use formic acid (HCOOH) or nitrogen and hydrogen mixture (N
2/ H
2) help weldering, can strengthen the face of weld activation capacity thus, improve wellability, and can realize welding without the cavity of fluxless.
The reflow soldering method concrete steps of the present embodiment:
C. make impeller 4 continue to stop behind the 90-degree rotation along former direction of rotation, object 12 to be welded is threaded to buffer area 5, and its temperature remains unchanged;
D. make impeller 4 again continue to stop behind the 90-degree rotation along former direction of rotation, object 12 to be welded is threaded to cooled region 7, and 6 pairs of objects 12 to be welded of cold drawing this moment cool off, to finish the drop in temperature operation in the reflow soldering;
E. make impeller 4 again continue to stop behind the 90-degree rotation along former direction of rotation, object 12 rotations to be welded are back to loading area 9, and object 12 to be welded was finished to weld and finished overall process this moment, opened fire door 10 and took out the finished product weldments.
The reflow soldering method of the present embodiment can carry out continous way welding and pile line operation.Welded part is positioned on the pallet 11 at loading area, 1 is warmed up to welding temperature and carries out reflow soldering to the thermal treatment zone from loading area rotation, and vavuum pump is in running order simultaneously, to guarantee the thermal treatment zone 1 interior formation vacuum state.Reflux complete after, 11 rotations of soldered and pallet arrive cooling zone 7 again through buffering area 5, stop a littlely, turn back to loading area 9 after being cooled to normal temperature again.Rotate a circle, finish once welding, the electronic devices and components that welding is good take out from loading area 9.The present embodiment can be realized streamline or automation mechanized operation at small-sized reflow soldering furnace, and general single cavity welding equipment is not possess pipeline system production capacity.If the rotation of impeller 4 adopts rotating control assembly 15 to control, heating and cooling adopt temperature controller 14 to control, so the above-mentioned solder reflow step of the basic automatically operation of reflow soldering equipment.
Claims (9)
1. rotary reflow soldering furnace, comprise: body of heater, fire door, impeller, rotating control assembly, pallet, the tray position adjusting device, vavuum pump, temperature controller, it is characterized in that described body of heater is crossed by contour cylinder and cuboid combines, the center line of cuboid and cylindrical dead in line, the width of cuboid is less than cylindrical diameter, the length of cuboid is greater than cylindrical diameter, cylindrical bottom surface is a border circular areas, this border circular areas is divided into the sector region of four area formed objects, furnace body wall is provided with fire door, the sector region of pressing close to fire door is loading area, the sector region at loading area diagonal angle is buffering area, the zone of all the other both sides, one side is the thermal treatment zone, opposite side is the cooling zone, be provided with one in the thermal treatment zone and be used for hot plate that electronic devices and components and scolder are heated, be provided with one in the cooling zone and be used for cold drawing that electronic devices and components and scolder are cooled off, be provided with an impeller in the body of heater, impeller is connected with the rotating control assembly circuit, the radius of impeller is identical with the radius of cylinder body of heater, be provided with between two blades be used to placing electronic devices and components to be welded and the pallet of scolder, pallet height is regulated by the tray position adjusting device, vavuum pump is connected with the thermal treatment zone through pipeline, and temperature controller is through circuit and hot plate, cold drawing connects.
2. rotary reflow soldering furnace according to claim 1, it is characterized in that described impeller is provided with four blades, blade is made by the heat-insulating material with rigidity, four cut-off rules of four sector regions of its vertical projecting line and the long line segment of the leaf on furnace bottom plane and furnace bottom overlap, four blades have separately formed four functional areas to the space in the furnace chamber, namely load zone, heating region, buffer area and cooled region, impeller drives through rotating control assembly and rotates around impeller shaft.
3. rotary reflow soldering furnace according to claim 1, it is characterized in that described pallet made by graphite material, for removably is fixed on the impeller, pallet drives along the axis direction of impeller shaft through the tray position adjusting device and moves up and down the distance between adjusting and hot plate or the cold drawing.
4. rotary reflow soldering furnace according to claim 1, it is characterized in that described impeller has a plurality of blades, be tight fit between blade and the body of heater cylindrical inner wall, be provided with the flexible material of sealing function between the outboard end edge of blade and the body of heater cylindrical inner wall.
5. rotary reflow soldering furnace according to claim 1 is characterized in that described hot plate by Resistant heating or electrothermal tube heating arrangement, and the heating power of hot plate is regulated by temperature controller, and hot plate is arranged in the heating region.
6. rotary reflow soldering furnace according to claim 1 is characterized in that described cold drawing is water-cooled or cooled with liquid nitrogen mode, and cold drawing is made by the metal material of good heat conductivity, is provided with the snake pipe for the cooling fluid circulation in the cold drawing.
7. rotary reflow soldering furnace according to claim 1 is characterized in that described temperature controller regulates the heating power of hot plate, and temperature controller is also regulated the coolant rate in the cold drawing cooling pipe.
8. rotary reflow soldering furnace according to claim 1 is characterized in that described vavuum pump is to link to each other with the residing zone of described hot plate.
9. the welding method of a rotary reflow soldering furnace comprises the following steps: successively
Impeller is resetted, open fire door in the situation that impeller is in initial position, object to be welded is positioned in the pallet of loading area, then close fire door, keep the sealing of reflow soldering furnace;
B. making impeller drive pallet with respect to its initial position stops behind the 90-degree rotation together, object to be welded is threaded to heating region, this moment, vacuum pumping was carried out in the vavuum pump action, and pallet is adjusted to hot plate and contacts and be heated to welding temperature, carried out the reflow soldering operation;
C. make impeller continue to stop behind the 90-degree rotation along former direction of rotation, object to be welded is threaded to the buffer area, and its temperature remains unchanged;
D. make impeller again continue to stop behind the 90-degree rotation along former direction of rotation, object to be welded is threaded to cooled region, and this moment, cold drawing cooled off object to be welded, to finish the drop in temperature operation in the reflow soldering;
E. make impeller again continue to stop behind the 90-degree rotation along former direction of rotation, object rotation to be welded is back to loading area, and object to be welded was finished to weld and finished overall process this moment, opened fire door and took out the finished product weldment.
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| CN 201210083102 CN103357981A (en) | 2012-03-26 | 2012-03-26 | Rotation type reflow soldering furnace and soldering method thereof |
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