JP4326212B2 - Heating furnace device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heating furnace apparatus having recovery means for recovering a liquefied substance during cooling mixed in an atmosphere.
[0002]
[Prior art]
The furnace body that reflow-heats and solders the workpiece has a workpiece loading / unloading section for loading the workpiece into the furnace body and a workpiece loading / unloading section for unloading the workpiece from the furnace body to move the atmosphere inside and outside the furnace body. In order to suppress it, the aperture is formed so as to reduce the opening area.
[0003]
In the furnace, flux gas is generated from the solder paste of the work due to high heat during reflow, and this flux gas is cooled and liquefied at the work carry-in part and work carry-out part, and the solidified flux components are carried into the work piece. Adheres to the inner wall of the mouth and the work outlet.
[0004]
In order to remove this flux, the conventional reflow apparatus arranges an electric heater for melting the solidified flux on the upper side of the work carry-in port and the work carry-out port, and a flux pool on the lower side. Then, after the reflow operation, the flux melted by the electric heater is dropped and collected in the flux reservoir.
[0005]
[Patent Document 1]
JP-A-10-173333 (page 3, FIG. 1)
[0006]
[Problems to be solved by the invention]
In this way, the liquefied substance during cooling, that is, the flux that has been liquefied and solidified on the inner wall of the workpiece carry-in port and the workpiece carry-out port, is melted by the upper electric heater after the reflow operation and becomes a lower flux pool. The flux recovery technology that collects the flux cannot be recovered during the reflow operation, the recovery efficiency is poor, and the liquefied or solidified flux may fall on the workpiece during the reflow operation, which may impair the workpiece quality. There is.
[0007]
The present invention has been made in view of the above points, and provides a heating furnace apparatus that can efficiently recover a liquefied substance during cooling during reflow operation and reliably prevent deterioration of the quality of the work caused by the liquefied substance during cooling. It is intended.
[0008]
[Means for Solving the Problems]
The invention described in claim 1 has a work carry-in part for carrying a work and a work carry-out part for carrying out the work, and the work carried in from the work carry-in part by the work carrying means is higher in pressure than the atmosphere. The furnace body that is heated in the atmosphere in the state and carried out from the work carry-out port, and the atmosphere inside the furnace body that is about to flow out of the furnace body from the work carry-in port and work carry-out port of the furnace body are sucked into the atmosphere Recovery means for recovering the gasified liquefied substance at the time of cooling mixed in the recovery means, the recovery means in a direction intersecting the work carry-in port portion and the work carry-out port portion of the furnace body and the work transfer means The liquefied substance during cooling is separated from the atmosphere sucked to the outside, the buffer chamber formed on both sides of the upper and lower sides, the suction opening that opens to a part of the buffer chamber and sucks the atmosphere inside the furnace body to the outside Removal A removal unit that, a blown blow port atmosphere that is removed during cooling liquified material by apertured removal unit to face the vertical and the suction port through the workpiece conveying means to a portion of the buffer chamber into the buffer chamber It is a heating furnace device, and the gasified cooling liquefied substance before liquefaction is collected from the work inlet and work outlet parts where the cooling liquefied substance gasified in the furnace body is easily liquefied by the recovery means. Since the liquefied substance during cooling is collected by sucking the contained atmosphere to the outside, the liquefied substance during cooling gasified in the furnace can be efficiently collected even during operation of the equipment, and at the work inlet and outlet parts As a result, it is possible to prevent adhesion of liquefied substances that have been liquefied or solidified during cooling, so that deterioration of the work quality due to dropping of liquefied substances during cooling can be prevented, and there are openings in part of the buffer chamber The atmosphere blown into the buffer chamber from the blowing port is enlarged in the buffer chamber at a low speed and moves to the suction port opened in a part of the buffer chamber through the work transfer means so as to face the blowing port. By preventing the occurrence of turbulent flow due to local high-speed airflow in the room, it is possible to prevent the turbulent flow from adversely affecting the heating capacity in the furnace body, that is, to stabilize the heating capacity in the furnace body, In addition, since the closed loop circulation system is formed by the buffer chamber, the suction port, the removal unit, and the blowing port, it is possible to prevent the liquefied substance from diffusing during cooling to the outside of the furnace body.
[0009]
請 Motomeko invention described in 2, which in the heating furnace according to claim 1 Symbol mounting, equipped with a cooling zone for cooling the workpiece is provided through the buffer chamber to the work unloading port of the furnace body, By interposing a buffer chamber between the work outlet of the furnace body and the cooling zone, heat transfer between the furnace body and the cooling zone is blocked by the buffer chamber, so that the heated high-temperature atmosphere in the furnace body And the cooled low-temperature atmosphere in the cooling zone can be prevented from affecting each other, and the heating efficiency in the furnace and the cooling efficiency in the cooling zone can be improved.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
It will be described in detail with the present invention with reference to an exemplary form status of that shown in Figure 1.
[0011]
As shown in FIG. 1, reference numeral 11 denotes a furnace body, and a conveyor 12 is disposed as a work conveyance means that conveys a workpiece W such as a component mounting board through the furnace body 11. The furnace body 11 is pressurized and supplied with an inert gas such as nitrogen gas. The conveyor 12 includes a pair of left and right guide frames 12a arranged in parallel, and a transport chain 12b incorporated in an endless manner.
[0012]
One end of the furnace body 11 is provided with an inlet throat 13 as a work carry-in entrance for carrying the work W, and an intermediate throat as a work carry-out exit for carrying out the work is provided at the other end of the furnace body 11. 14 is provided, and a workpiece cooling unit 15 for cooling the workpiece W is connected to the intermediate throat 14 of the furnace body 11, and an outlet throat 16 is provided on the outlet side of the workpiece cooling unit 15.
[0013]
These inlet throat 13, intermediate throat 14 and outlet throat 16 have a minimum opening for inserting the guide frame 12a of the conveyor 12, but the atmosphere in the furnace body 11 or the atmosphere in the work cooling unit 15 is In order to prevent outflow to other areas, the throat is squeezed as much as possible within a range where the workpiece W can be conveyed.
[0014]
For example, the inlet throat 13 is provided with an end plate 13a having a minimum opening on the work carry-in side and an end plate 13b having a minimum opening on the opposite side.
[0015]
Inside the furnace body 11, a buffer chamber 22 on the inlet side is formed by a partition wall 21 on the inner end side of the inlet throat 13, and a preheating zone 23 for preheating the workpiece W is formed on the workpiece progression side of the buffer chamber 22. An intermediate buffer chamber 26 is formed by a pair of partition walls 24 and 25 on the workpiece progression side of the preheating zone 23, and a reflow zone 27 for reflow heating the workpiece W is formed on the workpiece progression side of the buffer chamber 26. Has been.
[0016]
Inside the work cooling unit 15, a buffer chamber 29 is formed by a partition wall 28 on the intermediate throat 14 side. The partition wall 28 of the buffer chamber 29 has an opening 30 that is open to the workpiece progression side.
[0017]
These buffer chambers 22, 26, and 29 are enlarged and formed in the direction in which the workpiece W is conveyed, that is, in a direction that intersects the conveyor 12 at a right angle.
[0018]
The preheating zone 23 and the reflow zone 27 are each provided with heating means using hot air composed of a heater 31 and a fan 32, and the work cooling section 15 is provided with a cooling zone 34 provided with a cooling fan 33. Is provided.
[0019]
Also, on the work loading side of the furnace body 11, the atmosphere inside the furnace body 11 that is going to flow out from the inlet throat 13 to the outside of the furnace body 11 is sucked, and the gasified cooling mixed in this atmosphere is sucked A collecting means 35 for collecting the flux as the liquefied substance is provided. A part of the flux is gasified when the solder paste applied to the workpiece W is melted by heating by the heater 31 in the furnace body 11 and is contained in the inert atmosphere in the furnace body 11.
[0020]
Similarly, on the work carry-out side of the furnace body 11, the atmosphere containing the gasified flux in the furnace body 11 that is about to flow out from the intermediate throat 14 to the cooling zone 34 of the work cooling unit 15 is sucked into the flux. Recovery means 36 is provided for recovering.
[0021]
These recovery means 35, 36 are formed by expanding the buffer chambers 22, 29 in a direction intersecting the inlet throat 13 and the intermediate throat 14 of the furnace body 11, respectively. The suction ports 37 and 38 for sucking the atmosphere containing the gasified flux in the furnace body 11 are opened to the outside, and the suction ports 37 and 38 are gasified via the pipe lines 41 and 42, respectively. The removal units 43 and 44 for separating and removing the flux components from the atmosphere containing the flux are respectively connected, and the atmosphere from which the flux components have been removed by these removal units 43 and 44 are connected to the pipe lines 45 and 46, respectively. Then, blow-in ports 47 and 48 for blowing into the respective buffer chambers 22 and 29 are opened in a part of the buffer chambers 22 and 29, particularly at positions facing the suction ports 37 and 38, respectively.
[0022]
The removal units 43 and 44 of the collecting means 35 and 36 are respectively connected to a box-shaped unit main body 51, a suction port 52 communicated with the suction ports 37 and 38, and a discharge port 53 communicated with the blow ports 47 and 48. The unit main body 51 has cooling means 54 such as a radiator composed of cooling water pipes and fins.
[0023]
The cooling means 54 cools the atmosphere containing the high-heat gasified flux in the furnace body 11 to liquefy the flux in the atmosphere on the inner wall surface of the unit body 51 or the surface of the cooling means 54. Or has a function of passing them through mist.
[0024]
Under each cooling means 54, a flux reservoir 55 for storing the liquefied flux is disposed. These flux reservoirs 55 are provided so that they can be taken out from the unit main body 51.
[0025]
Further, in the unit main body 51 of each cooling unit 43, 44, a relatively coarse first filter 56 for capturing and removing the misted flux is disposed on the downstream side of each cooling hand 54, respectively. Further, a relatively fine second filter 57 for capturing and removing the particulate flux is disposed on the downstream side of these first filters 56, and further provided on the downstream side of these second filters 57. In the chamber 58, a fan 59 and a thermometer 60 are arranged.
[0026]
Each fan 59 sucks the atmosphere from each buffer chamber 22, 29 and blows the atmosphere from which the flux component has been removed by the cooling means 54, the first filter 56 and the second filter 57 into each buffer chamber 22, 29. is there.
[0027]
Further, in the buffer chamber 26 in the middle part of the furnace body 11, an outlet 61 for taking out the high-temperature atmosphere in the furnace body for dissolving and removing the flux cooled and solidified in the removal units 43 and 44, and this flux dissolving And a return port 62 for returning the atmosphere to the furnace body 11.
[0028]
Next, the function and effect of the embodiment shown in FIG. 1 will be described.
[0029]
The workpiece W is carried into the preheating zone 23 by the conveyor 12 through the inlet throat 13 and the buffer chamber 22, and the workpiece W is preheated in the preheating zone 23, and further conveyed to the reflow zone 27 through the buffer chamber 26. The solder paste between the substrate of the workpiece W and the mounted parts is melted by the high-temperature heating of the reflow zone 27, and the workpiece W is unloaded from the furnace body 11 through the intermediate throat 14 and is buffered in the workpiece cooling unit 15. It is carried into the cooling zone 34 through the chamber 29, and the strength of the solder joint portion is ensured by forced cooling in the cooling zone 34.
[0030]
The recovery means 35 and 36 for the buffer chambers 22 and 29 provided in the vicinity of the inlet throat 13 and the intermediate throat 14 are gas generated by the high heat in the furnace body 11 by the suction force of the fans 59 of the removal units 43 and 44, respectively. The atmosphere containing the converted flux is forcibly sucked and collected.
[0031]
That is, when the furnace body atmosphere flows out of the inlet throat 13 into the atmosphere or from the intermediate throat 14 into the cooling zone 34 of the work cooling unit 15, the flux is cooled in the low temperature inlet throat 13 or the cooling zone 34. Since it is easy to liquefy, the flux that has been gasified before being liquefied is forcibly sucked and collected from the buffer chambers 22 and 29 to the removal units 43 and 44.
[0032]
At this time, each removal unit 43, 44 cools the atmosphere containing the high-gasified flux in the furnace body 11 by the cooling means 54, so that the flux in the atmosphere is contained in the unit body 51. They are liquefied on the wall surface or the surface of the cooling means 54 or misted to pass through them, and the liquefied flux is collected in the flux reservoir 55, and the misted flux is captured and removed by the first filter 56. The fine particle flux passing through the first filter 56 is captured and removed by the finer second filter 57. Thus, the atmosphere from which the flux component has been removed by the cooling action and the filtering action is circulated to the buffer chambers 22 and 29 by the blowing action of the fan 59.
[0033]
At this time, the atmosphere blown into the buffer chambers 22 and 29 from the blow ports 47 and 48 is expanded in the buffer chambers 22 and 29 and moves to the suction ports 37 and 38 at a low speed. It is possible to prevent the occurrence of turbulent flow due to the local high-speed air flow at, and to prevent the turbulent flow from adversely affecting the heating capacity in the furnace body 11. That is, the heating capacity in the furnace body 11 can be stabilized.
[0034]
In addition, because the inside of the furnace body 11 is at a slightly higher pressure than the atmosphere due to inert gas such as nitrogen gas supplied under pressure, a low temperature atmosphere flows into the furnace body 11 from the inlet throat 13 and the intermediate throat 14. This can also prevent the possibility of failure, and this can also stabilize the heating capacity in the furnace body 11.
[0035]
Furthermore, a closed loop circulation system is formed by the buffer chambers 22 and 29, the suction ports 37 and 38, the pipe lines 41 and 42, the removal units 43 and 44, the pipe lines 45 and 46, and the blowing ports 47 and 48. After sucking the atmosphere containing the gasified flux by high heat of the outside and separating and removing the flux components by the removal units 43 and 44, the atmosphere is returned to the inside of the furnace body 11. The diffusion of gasified flux can be reliably prevented.
[0036]
Thus, the atmosphere containing the gasified flux before being liquefied at the stage before the inlet throat 13 and the cooling zone 34 in which the flux gasified in the furnace body 11 is liable to be liquefied by the recovery means 35 and 36. Because the flux is forcibly sucked to the outside and the flux is recovered, the flux gasified in the furnace body 11 can be efficiently sucked and recovered even during the reflow operation, and the liquefaction or cooling at the inlet throat 13 and the cooling zone 34 can be performed. The solidified flux can be prevented from adhering, and the quality of the work W can be prevented from deteriorating due to the fall of the adhering flux.
[0037]
In addition, each buffer chamber 22, 26, 29 can clearly form the preheating zone 23, the reflow zone 27 in the furnace body 11, and the cooling zone 34 of the work cooling section 15, and easily maintain the ambient temperature in each zone. Can do.
[0038]
In particular, by interposing the intermediate throat 14 and the buffer chamber 29 between the reflow zone 27 of the furnace body 11 and the cooling zone 34 of the workpiece cooling unit 15, the buffer chamber 29 and the like allow the reflow zone 27 and the cooling zone 34 to be Therefore, the possibility that the heated high-temperature atmosphere in the furnace body 11 and the cooled low-temperature atmosphere in the cooling zone 34 may influence each other can be prevented. The heating efficiency and the cooling efficiency in the cooling zone 34 can be improved .
Na us, the present invention not only reflow apparatus for soldering, for example can be applied to the furnace apparatus, such as a printed furnace of the solder resist.
[0039]
【The invention's effect】
According to the first aspect of the present invention, the gasification cooling before the liquefaction is performed from the workpiece carry-in portion and the workpiece carry-out portion where the liquefied substance gasified in the furnace is easily liquefied by the recovery means. Since the liquefied substance-containing atmosphere is sucked to the outside and the liquefied substance is recovered during cooling, the liquefied substance during cooling gasified in the furnace can be efficiently recovered even during operation of the apparatus, and the work inlet and outlet This prevents the liquefied material that has been liquefied or solidified from adhering at the cooling section, so that the quality of the workpiece can be prevented from dropping due to the falling of the liquefied material at the time of cooling. Since the atmosphere blown into the room is enlarged at a low speed in the buffer chamber, and moves to the suction port opened in a part of the buffer chamber so as to face the blowing port via the work transfer means, It is possible to prevent the occurrence of turbulent flow due to local high-speed airflow in the buffer room, and to prevent the turbulent flow from adversely affecting the heating capacity in the furnace body, that is, to stabilize the heating capacity in the furnace body. Further, since the closed loop circulation system is formed by the buffer chamber, the suction port, the removal unit, and the blowing port, it is possible to prevent the liquefied substance from diffusing during cooling to the outside of the furnace body.
[0040]
According to the invention 請 Motomeko 2 wherein, by interposing the buffer chamber between the workpiece carry-out port of the furnace body and the cooling zone, block heat transfer between the furnace body and the cooling zone by the buffer chamber As a result, the heated high-temperature atmosphere in the furnace and the cooled low-temperature atmosphere in the cooling zone can be prevented from interacting with each other, improving the heating efficiency in the furnace and the cooling efficiency in the cooling zone. it can.
[Brief description of the drawings]
[1] Ru side cross-sectional view showing an embodiment of a furnace apparatus according to the present invention.
[Explanation of symbols]
W Work
11 Furnace
12 Conveyor as a work transfer means
13 Inlet throat as workpiece loading part
14 Intermediate throat as work exit
22, 29 Buffer room
34 Cooling zone
35, 36 Collection means
37, 38 Suction port
43, 44 removal unit
47, 48 inlet

Claims (2)

It has a work carry-in part for carrying a work and a work carry-out part for carrying out the work, and the work carried in from the work carry-in part by the work carrying means is heated in an atmosphere at a higher pressure than the atmosphere. A furnace body to be unloaded from the unloading section;
A recovery means for sucking the atmosphere inside the furnace body from the workpiece carry-in portion and the work carry-out portion of the furnace body and recovering the gasified liquefied liquefied material mixed in the atmosphere; Equipped,
The recovery means is
A buffer chamber formed in a direction intersecting with the workpiece loading / unloading portion and the workpiece loading / unloading portion of the furnace body and enlarged on both upper and lower sides via the workpiece conveying means;
A suction port which is opened in a part of the buffer chamber and sucks the atmosphere in the furnace body to the outside;
A removal unit that separates and removes liquefied substances during cooling from the atmosphere sucked to the outside;
And characterized in that a blown blow port atmosphere that is removed during cooling liquified material by suction port and vertically to face an opening in a portion of the buffer chamber removal unit through the workpiece conveying means to the buffer chamber Heating furnace equipment. Furnace body according to claim 1 Symbol placement of the furnace device, characterized by comprising a cooling zone for cooling the workpiece unloading opening portion of the work is provided via a buffer chamber.

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