JP2008249297A - Carriable heating device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carriable heating device and a method capable of highly accurately and uniformly heating a heating object, in a small and simple carriable heating system capable of carrying and heating the heating object. <P>SOLUTION: A first conveyor 3 continuously carries a carrying carrier 2 mounted with a plurality of heating objects 1 at a constant speed. A second conveyor 6 is arranged on the downstream side of the first conveyor 3, and intermittently carries the carrying carrier 2 with every specific distance. A transfer device 9 transfers the carrying carrier 2 to a supply position 7 of the second conveyor 6 from great number days 5 of the first conveyor 3. In a first heating system 10, heating units 11 and 14 heat the heating object 1, and in a second heating system 17, heating units 18, 21 and 14 heat the heating object 1. In this case, the heating object 1 is heated in the heating units 18, 21 and 24 of the second heating system 17 in a state of being shut up by shutters 29, 32, 35 and 38. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a conveyance type heating apparatus that performs heat treatment while conveying electric components such as a circuit board and a lead frame.

  Conventional transfer heating furnace transfer systems are roughly classified into a continuous feed transfer system and an intermittent feed transfer system. Patent Document 1 discloses a conventional transfer heating furnace (chisso reflow device) to which the former continuous feed transfer system is applied. As shown in FIG. 3, in this conventional heating apparatus, a heating chamber 101 is disposed above the conveyor 100, and this heating chamber 101 is preheated by a partition wall 106 from the entrance 104 side toward the exit 105. It is divided into zone T1, soaking zone T2, and reflow zone T3. Moreover, the cooling chamber 110 which comprises the cooling zone T4 is arrange | positioned at the edge part by the side of the exit 105. FIG. A fan 108 is installed in each zone, and a heater 109 is installed in the preheating zone T1, the soaking zone T2, and the reflow zone T3. Nitrogen gas is supplied from the nitrogen gas supply source 107 to the zones T1 to T3. And while the board | substrate 102 with which the electronic component 103 was mounted is mounted on the conveyor 100 and it conveys continuously from the entrance 104 to the exit 105, a to-be-heated target passes a several heating zone at a constant speed. That is, a predetermined temperature profile is given to the object to be heated.

  On the other hand, the conventional transfer furnace using the latter intermittent feed transfer system repeatedly passes the object to be heated through a plurality of heating zone groups, each of which is temperature-controlled, by intermittent feed operation and stationary in each zone. To give a predetermined temperature profile.

  In addition, in Patent Document 2, an object to be heated is conveyed on a conveyor, a front chamber provided so as to surround the conveyor, a heating chamber, and a rear chamber are arranged in the conveyance direction of the object to be heated, There is disclosed a soldering heating furnace in which the chambers can be partitioned by a shutter. However, in this prior art, the heating furnace provided with the heater is not partitioned and is the same as in Patent Document 1.

  Patent Document 3 discloses a substrate heat treatment apparatus in which a plurality of heat sources are partitioned by a partition wall and independent for each section, and the temperature can be controlled for each section. The substrate heat treatment apparatus described in Patent Document 3 includes an intermittent feed conveyance system.

Japanese Patent Laid-Open No. 06-007924 (FIG. 3) JP-A-5-13949 (FIG. 4) JP 2004-333074 A

  However, in the conventional continuous feeding and conveying system, since the heating zones communicate with each other, the atmospheric temperature of each zone interferes with each other, so that the variation in the heating temperature is large in the surface range of the object to be heated. Therefore, there is a problem that temperature control cannot be performed with high accuracy and good uniformity.

  In addition, in the intermittent feed conveyance system, the object to be heated is rapidly heated by the heating means immediately after the intermittent feed is completed, so that the temperature rises suddenly even though a moderate temperature rise is necessary in the process. Was causing poor quality. For example, in the process of curing the adhesive resin, the solvent contained in the adhesive resin is rapidly activated, generating voids and resin scattering.

  The present invention has been made in view of such problems, and is a small and simple transport heating system capable of transporting and heating an object to be heated, and heating the object to be heated with high accuracy and uniformity. It is an object of the present invention to provide a conveying furnace that can be used.

  The transport heating apparatus according to the present invention includes a primary transport means for continuously transporting a transport carrier carrying a plurality of objects to be heated at a constant speed, and a transport mechanism disposed downstream of the primary transport means. A secondary transport means for intermittently transporting the carrier for every fixed distance, and an end position of the primary transport means arranged between the primary transport means and the secondary transport means A transfer means for transferring from the first transfer means to a starting end position of the secondary transfer means, a primary heating means for heating the object to be heated that is provided above the primary transfer means and passes below, A secondary heating unit that is provided above the secondary transport unit and that heats the object to be heated; and a transport area of the secondary transport unit is longer than a length in the transport direction of the transport carrier. Divide and divide into multiple bands at large intervals Characterized by having a a plurality of shutter can close.

  The primary heating means has, for example, a plurality of heating units that are arranged in the transport direction of the transport carrier and can be independently controlled in temperature, and each of the heating units includes a heater and a blower. .

  The secondary heating means includes, for example, a heating unit disposed in each of a plurality of rooms partitioned by the shutter, and each heating unit includes a heater and a blower capable of independently controlling the temperature.

  Furthermore, the present invention has a fixed wall that divides the transport area of the secondary transport means into a plurality of bands at intervals larger than the transport direction length of the transport carrier. The wall is spaced apart from the secondary transport means so as to allow the transport carrier and the object to be heated to pass, and the shutter is disposed between the fixed wall and the secondary transport means. It is preferable to open and close the gap.

  The transport heating method according to the present invention includes a primary transport step in which a transport carrier carrying a plurality of objects to be heated is heated by a primary heating means while being continuously transported at a constant speed by a primary transport means. Next, the transport carrier is intermittently transported at regular intervals by a secondary transport unit disposed downstream of the primary transport unit, and a plurality of bands are formed in the transport direction of the secondary transport unit. A second transport step of sequentially transporting the carrier for transport into the compartments partitioned so as to become, and heating the object to be heated by a secondary heating means in each of the chambers. A shutter provided on the partition wall is opened to pass the carrier for transportation, and the shutter is closed to confine the carrier for transportation in each chamber.

  In the present invention, the carrier for conveyance supplied to the starting position of the primary conveying means is continuously conveyed by the operation of the primary conveying means. During this time, the object to be heated mounted on the carrier for conveyance is heated with a predetermined temperature profile by the heating unit of the primary heating means corresponding to the advancement degree of the carrier for conveyance.

  Next, when the transport carrier arrives at the end position of the primary transport means, the partition shutter operates in the open state, and is transferred to the start end position of the secondary transport means by the action of the transport means. Operates in the closed state. Thereafter, when a predetermined heating time elapses, the partition shutter operates in an open state, the intermittent transport of the secondary transport unit operates, and the transport carrier is transported by one pitch distance. Thereafter, the partition shutter operates in a closed state. During this time, the object to be heated mounted on the carrier for conveyance is heated with a predetermined temperature profile by the heating unit group of the secondary heating means in an atmosphere closed by the partition shutters.

  In this way, the transport type heating apparatus of the present invention heats gently in the transport area of the initial primary transport means, and then heats uniformly and accurately in the transport area of the secondary transport means. be able to. Therefore, it is possible to heat accurately with a predetermined temperature profile without causing quality defects due to the occurrence of voids and resin scattering.

  According to the present invention, in the conveyance area of continuous feed conveyance, a gradual temperature gradient is obtained by increasing the temperature as the conveyance carrier advances, and in the conveyance area of intermittent feed conveyance, it is partitioned. By closing each of the plurality of heating zones with a partition shutter, the constant temperature characteristics of each heating zone can be improved, temperature control with high accuracy can be performed, and the heating temperature of the object to be heated can be equalized. .

  Next, a conveyance type heating apparatus according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a conveyance type heating apparatus according to an embodiment of the present invention, and FIG. 2 is a view showing a heating pattern of an object to be heated. In this embodiment, a plurality of objects to be heated 1 made of electrical components such as a circuit board and a lead frame are mounted on the carrier 2 for transportation, and the carrier 2 for transportation is transported at a constant speed. Is supplied to the supply position 4 of the first conveyor 3 as the primary conveying means for continuous conveyance. On the downstream side of the first conveyor 3 in the conveyance direction, a second conveyor 6 is arranged as a secondary conveyance means for intermittently conveying the carrier 2 for conveyance at regular intervals. A transfer device 9 as transfer means is disposed between the first conveyor 3 and the second conveyor 6, and the transfer device 9 reaches the end position 5 of the first conveyor 3. 2 is transferred from the first conveyor 3 to the starting end position 7 of the second conveyor 6. The second conveyor 6 intermittently conveys the carrier for transfer 2 transferred to the starting end position 7 by a fixed distance, and intermittently moves it to the take-out position 8.

  Above the first conveyor 3, a first heating device 10 is arranged as a primary heating means for heating the object 1 to be heated on the first conveyor 3. In the first heating device 10, the first front heating unit 11 and the first rear heating unit 14 are arranged in this order in the transport direction of the first conveyor 3, and the object 1 to be heated on the first conveyor 3 is arranged. Are heated sequentially by the first pre-stage heating unit 11 and the first post-stage heating unit 14. Each unit 11, 14 is provided with a heater 12 and a blower 13, a heater 15 and a blower 16, and each unit 11, 14 is an object to be heated on the first conveyor 3. 1 can be heated and controlled independently of each other. Further, each of the blowers 13 and 16 blows and circulates the atmosphere heated by the heaters 12 and 15.

  Above the second conveyor 6, a second heating device 17 is arranged as a secondary heating means for heating the object 1 to be heated on the second conveyor 6. In this second heating device 17, The second front heating unit 18, the second middle heating unit 21, and the third rear heating unit 24 are arranged in this order in the transport direction. In each heating unit 18, 21, 24, a heater 19 and The air blower 20, the heater 22, the air blower 23, the heater 25, and the air blower 26 are arrange | positioned. These blowers 20, 23, and 26 also blow and circulate the atmosphere heated by the heaters 19, 22, and 25.

  Fixed walls 30a, 33a, 36a, 39a are arranged between the front end portion of the front end heating unit 18 and the rear end portion of the rear stage heating unit 24 and the respective heating units, and walls that partition each unit as a heating chamber; It has become. Between these fixed walls 30a, 33a, 36a, 39a and the second conveyor 6, a space (the first space 30, the second space) is used in order to pass the carrier 2 for carrying the object 1 to be heated. 33, a third space 36 and a fourth space 39). This space (the first space 30, the second space 33, the third space 36, and the fourth space 39) can be opened and closed by the first shutter 29, the second shutter 32, the third shutter 35, and the fourth shutter 38, respectively. It has become. When these shutters 29, 32, 35 and 38 are open, the transport carrier 2 can be moved through. When the shutters 29, 32, 35 and 38 are closed, the heating units 18, 21, 24 are The space is closed by the fixed wall 30a and the shutter 29 and the like, and the object 1 to be heated on the carrier 2 for transportation is heated in the closed space. In addition, the supply position 7 when supplying the carrier 2 for conveyance to the 2nd conveyor 6 is the center of the 2nd front | former stage heating knit 18 arrange | positioned most upstream.

  Each of these heating units 18, 21, and 24 has a spacing between the fixed walls 30 a, 33 a, 36 a, and 39 a and a spacing between the shutters 29, 32, 35, and 38, so that the transport direction of the transport carrier 2 is Greater than the length of. For this reason, when the shutters 29, 32, 35, 38 are closed, the transport carrier 2 is confined in the chambers of the units 18, 21, 24. The second conveyor 6 moves in a single intermittent operation by the arrangement pitch of the units 18, 21 and 24. Accordingly, when the second conveyor 6 is intermittently operated once, the carrier 2 for conveyance on the second conveyor 6 moves to the adjacent unit.

  Each heating unit described above is connected to a temperature control unit (not shown), and the temperature can be controlled to a predetermined temperature state for each heating unit.

  The partition shutter group 27 includes a first shutter unit 28, a second shutter unit 31, a third shutter unit 34, and a fourth shutter unit 37. The first shutter unit 28 includes a first shutter 29 that opens and closes a first space 30 through which the carrier 2 for transportation can be mounted in a form in which the object 1 to be heated is mounted, and the other shutter units 31 and 34 are also the same. As described above, the installation intervals of the shutters 29, 32, 35, and 38 are arranged at equal intervals with a distance larger than the feed direction dimension of the carrier 2 to be applied. Further, as described above, the intermittent feed distance of the carrier 2 for conveyance on the second conveyor 6 is the same as the installation interval dimension of each shutter.

  Next, the operation of this embodiment will be described with reference to FIGS. First, the 1st heating apparatus 10 as a primary heating means and the 2nd heating apparatus 17 as a secondary heating means are operated, and the atmospheric temperature inside a furnace is raised to a predetermined temperature state. Next, the carrier 2 for carrying a plurality of objects to be heated 1 is supplied to the supply position 4 of the first conveyor 3 by a conveying means (not shown) from the previous step, and a plurality of objects to be heated 1 are loaded. The carrier 2 for conveyance is continuously conveyed in the arrow direction shown in FIG. 1 by the operation of the first conveyor 3. During this time, the heating object 1 mounted on the carrier 2 for transportation is heated with a predetermined temperature profile by the heating action of the first heating device 17 corresponding to the advancement degree of the carrier 2 for transportation.

  Next, when the transport carrier 2 arrives at the end position 5 of the first heating device 10, the partition shutter group 27 (shutters 29, 32, 35, and 38) is activated, and the transfer device 9 is activated to 2 is transferred to the start position 7 of the conveyor 6, and the partition shutter group 27 is operated in the closed state. Thereafter, when a predetermined heating time elapses, the partition shutter group 27 is operated in an open state, the intermittent feed of the second conveyor 6 is operated, the transport carrier 2 is fed by one pitch distance, and the partition shutter group 27 is operated. Operates in the closed state. Thereafter, the same operation is repeated until the transport carrier 2 reaches the take-out position 8 of the second conveyor 6.

  During this time, the heating object 1 mounted on the carrier 2 is heated with a predetermined temperature profile by the second heating device 17 in a closed atmosphere between the shutters of the partition shutter group 27. In this way, the first heating device that is set in advance to the required temperature conditions while the plurality of objects to be heated 1 mounted on the carrier 2 for conveyance are sequentially conveyed from the supply position 4 to the extraction position 8. 10 and the secondary heating device 17 are heated by a predetermined temperature condition / profile by heat generated from the secondary heating device 17.

  Thereby, for example, as shown in FIG. 2, the object 1 to be heated on the transport carrier 2 has a gentle temperature gradient (temperature increase temperature gradient) that does not cause voids and resin scattering in the range of the first heating device 10. In the range of the second heating device 17, the temperature is controlled with high accuracy, and a heating characteristic with excellent temperature uniformity is obtained.

  The present invention can be suitably applied to the heating process of electrical components such as circuit boards and lead frames.

It is a figure which shows the conveyance heating apparatus which concerns on embodiment of this invention. It is a figure which shows the temperature profile of this embodiment. It is a figure which shows the conventional conveyance type heating apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Object to be heated 2 Carrier for conveyance 3 1st conveyor 4 Supply position 5 Termination position 6 2nd conveyor 7 Supply position 8 Extraction position 9 Transfer device 10 1st heating device 11 1st front | former heating unit 12, 15, 19, 22 , 25 Heater 13, 16, 20, 23, 26 Blower 14 First second-stage heating unit 17 Second heating device 18 Second first-stage heating unit 21 Second middle-stage heating unit 24 Second second-stage heating unit 27 Partition shutter group 28, 31, 34, 37 Shutter unit 29, 32, 35, 38 Shutter 30, 33, 36, 39 Space 100 Conveyor 101 Heating chamber 102 Substrate 103 Parts 104 Inlet 105 Outlet

Claims (5)

A primary transport means for continuously transporting a transport carrier carrying a plurality of objects to be heated at a constant speed, and an intermittent transport of the transport carrier arranged at a certain distance on the downstream side of the primary transport means. A secondary transport means, and the transport carrier disposed between the primary transport means and the secondary transport means from the end position of the primary transport means to the start end position of the secondary transport means A transfer means for transferring the object to be heated, a primary heating means for heating the object to be heated which is provided above the primary transfer means and passes below, and provided above the secondary transfer means. A secondary heating means for heating the object to be heated located below; and a transport area of the secondary transport means is divided into a plurality of zones at intervals larger than the length of the transport carrier in the transport direction. A plurality of openable and closable shutters, Conveying heating device characterized in that it comprises. The primary heating means includes a plurality of heating units which are arranged in the transport direction of the transport carrier and can be independently temperature controlled, and each heating unit includes a heater and a blower. The conveyance heating apparatus according to claim 1. The secondary heating means has a heating unit disposed in each of a plurality of rooms partitioned by the shutter, and each heating unit has a heater and a blower capable of independently controlling the temperature. The conveyance heating apparatus according to claim 1 or 2. A fixing wall that divides the conveying area of the secondary conveying means into a plurality of bands at intervals larger than the length of the conveying carrier in the conveying direction of the conveying carrier, and the fixed wall is used for the conveying A carrier and the object to be heated are arranged so as to be separated from the secondary conveying means so as to allow the passage, and the shutter opens and closes a gap between the fixed wall and the secondary conveying means. The conveyance heating apparatus according to any one of claims 1 to 3, wherein A first conveying step of heating a carrier for carrying a plurality of objects to be heated by the first heating unit while continuously conveying the carrier at a constant speed by the first conveying unit; The transporting carrier is intermittently transported at regular intervals by a secondary transporting means disposed on the downstream side, and the chamber is partitioned into a plurality of zones in the transporting direction of the secondary transporting means. And a second transfer step of heating the object to be heated by secondary heating means in each room, and opening a shutter provided on the partition wall of each chamber. The transport heating method is characterized in that the transport carrier is passed through, the shutter is closed, and the transport carrier is enclosed in each chamber.

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