JP2016125086A - Heat treatment method and plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat treatment method in which, during the process of treatment or during the transportation process, deformations are less likely to occur to an object to be treated such as a laminated iron core, and scratches and dirt are less likely to occur to the surface of an object to be treated.SOLUTION: Provided is a heat treatment method including: placing a plate 5 on a transportation fixture 6; further placing an object to be treated 3 on the plate 5; having the plate 5 surface-support the object to be treated 3; carrying-in the transportation fixture 6 into a heat treatment furnace 1; and heating or cooling the object to be treated 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat treatment method in which an object to be processed is placed on a conveying jig and carried into a heat treatment furnace, and a plate used in the method.

  Heat treatment is a general term for treatments that change the properties of an object to be treated by heating or cooling. The heat treatment includes, for example, quenching, tempering, annealing, normalizing, oil baking, blackening treatment, and the like. It is also well known that a large number of objects to be processed are placed on a transfer jig, loaded into a heat treatment furnace, subjected to heat treatment, and then carried out or transferred to the next process (for example, Patent Documents). 1). The conveying jig is also called a tray or a pallet, and is generally configured in a lattice shape so that an object to be processed is heated and cooled evenly (for example, Patent Documents 1, 2, and 3).

Now, for example, various heat treatments are performed in a manufacturing process for a laminated core such as an armature core of an electric motor or a generator. For example, oil baking, annealing, and blackening treatment are performed. Oil baking is a process of evaporating and removing oil such as stamping oil that has adhered to the surface of the base plate in the processing step. Annealing is also called annealing, and is a process for removing distortion and internal stress of the base plate (for example, Patent Document 4). The blackening treatment is also called bluing, and is a treatment for forming a coating of triiron tetroxide (Fe ₃ O ₄ ) (so-called black rust) on the surface of the base plate for rust prevention. Oil baking, annealing, and blackening treatment may be performed continuously. For example, FIG. 1 of Patent Document 5 includes a continuous annealing / blowing apparatus that connects a deoiling furnace 2, an annealing furnace 3, and a bluing furnace 4 through a feed path 1, and carries a workpiece into and out of each furnace. It is disclosed. In addition, a cooling process may be inserted between these processes (for example, Patent Document 5, air cooling mechanism 50 in FIG. 1).

JP 2003-113421 A JP 2008-38194 A JP 2009-249649 A JP-A-11-332183 Japanese Examined Patent Publication No. 7-42508

  As described above, generally, the conveying jig is configured in a lattice shape. When an object to be processed (for example, a laminated core) is placed on such a conveying jig, the support reaction force that the object to be processed receives from the conveying jig concentrates on a portion that contacts the lattice of the conveying jig. An object to be processed such as a laminated iron core is generally considered to be an object that is hardly deformed, but even such an object is easily deformed because the material softens at high temperatures. Therefore, when heat treatment is performed using a conventional conveying jig, there is a problem that the workpiece is easily deformed in the process.

  In addition, since the conventional transfer jig does not have a means for restraining the displacement of the object to be processed, the object to be processed is displaced on the transfer jig during transfer or processing, and the object to be processed is rubbed against the transfer jig. Sometimes. Therefore, when heat treatment is performed using a conventional conveying jig, there is also a problem that scratches are generated on the object to be processed. There is also a problem that when there is rust or dirt on the surface of the conveying jig, the rust or dirt is transferred to the workpiece.

  The present invention has been made in view of such circumstances, and provides a heat treatment method in which a workpiece is hardly deformed in a process or a conveyance process, and a surface of the workpiece is hardly damaged or soiled. For the purpose. Moreover, it aims at providing the plate used for this heat processing method.

  In order to solve the above-described problem, a heat treatment method according to the first aspect of the present invention includes placing a plate on a conveying jig and placing a workpiece on the plate, Is supported on the plate, and the conveying jig is carried into a heat treatment furnace to heat or cool the workpiece.

  A plurality of transfer jigs may be stacked and carried into a heat treatment furnace to heat or cool the workpiece.

  The workpiece is, for example, a laminated iron core. The heat treatment furnace is, for example, a deoiling furnace, an annealing furnace, or a bluing furnace.

  A plate according to a second aspect of the present invention is a plate on which a workpiece is placed and placed on a transport jig that transports the workpiece to a heat treatment furnace, on which the workpiece is placed. Thus, the object to be processed is surface-supported.

  The plate may be provided with a through-hole penetrating from the upper surface to the lower surface through which the atmosphere passes when the plate is placed on the transport jig. Moreover, you may make it provide the plate positioning part which positions a plate with respect to a conveyance jig. The plate positioning part is a protruding member that protrudes from the lower surface of the plate and engages with the conveying jig, for example.

  You may make it provide the to-be-processed object positioning part which positions to-be-processed object with respect to a plate. The workpiece positioning portion is, for example, a concave portion that is formed on the upper surface of the plate and fits with the workpiece, or a protruding member that protrudes from the upper surface of the plate and engages the workpiece.

  According to the present invention, since the object to be processed is surface-supported by the plate, the support reaction force received by the object to be processed is dispersed throughout the object to be processed. Therefore, deformation hardly occurs during the heat treatment. In addition, since the workpiece is not in direct contact with the transport jig, damage and contamination due to contact with the transport jig are less likely to occur in the workpiece. As a result, the quality of the heat-treated object is improved.

It is a conceptual sectional view showing the composition of the heat treatment apparatus concerning the embodiment of the present invention. It is an external view of the conveyance jig used in the heat processing apparatus of FIG. 1, (a) is a top view, (b) is an elevation view. It is an external view of the plate mounted in the conveyance jig of FIG. 2, (a) is a top view, (b) is an elevation view. It is explanatory drawing explaining the inner and outer diameter of the laminated iron core mounted in the plate and plate which are described in FIG. It is a top view which shows the state which mounted the plate of FIG. 3 on the conveyance jig of FIG. FIG. 3 is an elevational view showing a state where six stages of the conveying jig illustrated in FIG. 2 are stacked. It is the external view of the plate which concerns on a modification, (a) is a top view, (b) is sectional drawing cut | disconnected by the A-A 'line | wire of (a). It is a top view which compares the shape of the plate which concerns on another modification, and a laminated iron core, (a) is an example where a laminated iron core overhangs with respect to a plate in an inner diameter side, (b) is an outer diameter side in a laminated iron core. Examples of overhanging the plate are shown below. It is explanatory drawing which shows the structure of the plate which concerns on another modification, and is sectional drawing according to FIG.7 (b).

  Hereinafter, a heat treatment method according to an embodiment of the present invention and a plate used in the method will be described in detail with reference to the drawings. Here, as a specific example of the heat treatment, oil baking, annealing, blackening treatment and cooling are illustrated. As a specific example of the workpiece, a laminated iron core is illustrated.

  FIG. 1 is a conceptual cross-sectional view showing a configuration of a heat treatment apparatus 1 that performs heat treatment according to an embodiment of the present invention. The heat treatment apparatus 1 is a continuous heat treatment apparatus that performs various heat treatments, which will be described later, on the laminated core 3 carried into the carry-in section 2 and then carries out to the carry-out section 4.

  The laminated core 3 is an iron core that constitutes the armature of the rotary motor. In a separate process (not shown), the laminated iron core 3 is formed by stacking a plurality of base plates formed by punching out a thin plate of a so-called electromagnetic steel plate with a press machine and connecting them by caulking or the like. The laminated core 3 is placed on the conveying jig 6 in a previous step (not shown), but before that, the plate 5 is placed on the conveying jig 6, and then the laminated core 3 is placed on the plate 5. Is placed. The laminated iron core 3 is carried into the carry-in section 2 in this state, that is, in a state of being placed on the plate 5 placed on the conveying jig 6. And the laminated core 3 is carried out to the carrying-out part 4 through various heat processing furnaces etc. which are mentioned later. The detailed configuration of the plate 5 and the conveying jig 6 will be described later.

  The heat treatment apparatus 1 includes a transport device 7 that transports the laminated iron core 3 (the plate 5 and the transport jig 6 on which the laminated core 3 is placed) from the carry-in unit 2 to the carry-out unit 4. Further, a deoiling furnace 8, an annealing furnace 9, a first cooling part 10, a brewing furnace 11, and a second cooling part 12 are arranged in series between the carry-in part 2 and the carry-out part 4. In addition, shutters 13 (13a to 13f) are arranged at the entrance of the deoiling furnace 8, the exit of the second cooling unit 12, and the boundary between the deoiling furnace 8 and the second cooling unit 12.

  The transport device 7 includes a drive sprocket wheel 7 a disposed in the carry-out unit 4 and a driven sprocket wheel 7 b disposed in the carry-in unit 2. An endless chain (not shown) is wound between the drive sprocket wheel 7a and the driven sprocket wheel 7b, and a large number of slats 7c are arranged and attached to the endless chain in the moving direction of the endless chain. The drive sprocket wheel 7a is driven by a rotary motor (not shown).

  The deoiling furnace 8 is a heat treatment furnace that evaporates the oil adhering to the base plate constituting the laminated core 3 in the punching process, that is, a heat treatment furnace that performs so-called “oil baking” on the laminated core 3. Inside the deoiling furnace 8, a heater 8a for raising the temperature of the laminated core 3 to a deoiling temperature (around 300 to 400 ° C.) is disposed. Discharge cylinders 8b and 8c are disposed at the front and rear ends of the deoiling furnace 8, and the oil heated and evaporated by the heater 8a is discharged to the outside through the discharge cylinders 8b and 8c. The deoiling furnace 8 is disposed adjacent to the carry-in unit 2, and a shutter 13 a is disposed between the deoiling furnace 8 and the carry-in unit 2.

  The annealing furnace 9 is a heat treatment furnace that heats and anneals the laminated core 3. Inside the annealing furnace 9, a heater 9 a that raises and holds the laminated core 3 to an annealing temperature (for example, near 800 ° C.) is disposed. The annealing furnace 9 is disposed at the tip of the deoiling furnace 8, and a shutter 13 b is disposed between the annealing furnace 9 and the deoiling furnace 8.

  The 1st cooling part 10 is a division which cools the laminated iron core 3 which annealed to the temperature suitable for the start of brewing. The first cooling unit 10 is provided with an intake cylinder 10a that takes in cooling air from the outside, and an exhaust cylinder 10b that discharges cooling air that has received heat from the laminated core 3 and raised its temperature. The first cooling unit 10 is disposed at the tip of the annealing furnace 9, and a shutter 13 c is disposed between the annealing furnace 9 and the annealing furnace 9.

The bluing furnace 11 is a heat treatment furnace that generates a film of triiron tetroxide (Fe ₃ O ₄ ) on the surface of the laminated core 3. Inside the brewing furnace 11, there are disposed a heater 11a for lowering the atmosphere in the furnace with a time-temperature curve suitable for film formation, and a gas supply nozzle 11b for blowing inert gas (nitrogen gas) and water vapor. ing. The bluing furnace 11 is disposed at the tip of the first cooling unit 10, and a shutter 13 d is disposed between the bluing furnace 11 and the first cooling unit 10.

  The 2nd cooling part 12 is a division which cools laminated iron core 3 which finished brewing to normal temperature. The second cooling unit 12 is provided with an intake cylinder 12a for taking in cooling air from the outside, and an exhaust cylinder 12b for discharging the cooling air that has absorbed heat from the laminated core 3 and raised its temperature to the outside. The second cooling unit 12 is disposed at the tip of the brewing furnace 11, and a shutter 13 e is disposed between the second cooling unit 12 and the brewing furnace 11. Further, the carry-out unit 4 is arranged at the tip of the second cooling unit 12, and a shutter 13 f is arranged between the second cooling unit 12 and the carry-out unit 4.

  The shutters 13 (13a to 13f) are devices that prevent the atmosphere inside each section (deoiling furnace 8 to the second cooling unit 12) from flowing into other sections and flowing out to the outside. The shutter 13 includes a main body (shielding plate) and an actuator (for example, an air cylinder) (not shown) that moves the shielding plate up and down. In addition, in FIG. 1, about the shutter 13a arrange | positioned at the entrance of the deoiling furnace 8, the state which the shielding board raised, ie, the state where the entrance of the deoiling furnace 8 was opened is shown. The other shutters 13b to 13f show a state in which the shielding plate is lowered, that is, a state in which the boundaries between the sections are closed.

  The heat processing apparatus 1 is controlled by the control apparatus 14 provided with the computer which is not shown in figure. The control device 14 executes a program stored in the computer to control the transport device 7. For example, the control device 14 executes a program stored in the computer, opens and closes the shutter 13 (13a to 13f), operates the deoiling furnace 8, the annealing furnace 9, and the brewing furnace 11, and the first cooling unit 10 and the flow rate of the cooling air supplied to the second cooling unit 12 are adjusted.

The heat treatment apparatus 1 is generally operated in the following sequence. First, an operator uses, for example, a hoist (not shown) or a robot carries the conveyance jig 6 on which the laminated core 3 and the plate 5 are placed into the carry-in unit 2. When the loading is completed, the operator turns on a start switch (not shown). When the start switch is turned on, the control device 14 instructs the shutter 13a disposed at the entrance of the deoiling furnace 8 to open the entrance of the deoiling furnace 8, and instructs the transfer device 7 to provide the laminated iron core. 3 and the transfer jig 6 on which the plate 5 is placed are transferred into the deoiling furnace 8. Thereafter, the control device 14 instructs the shutter 13 a to close the entrance of the deoiling furnace 8, instructs the deoiling furnace 8 to operate the heater 8 a, and the laminated core 3 placed on the conveying jig 6. Remove oil adhering to. That is, “oil baking” is performed on the laminated iron core 3. When the “oil baking” is completed, the control device 14 instructs the shutter 13b and the transfer device 7 disposed at the boundary between the deoiling furnace 8 and the annealing furnace 9 to transfer the laminated iron core 3 and the plate 5 to each other. The tool 6 is transferred into the annealing furnace 9. Then, the shutter 13b is commanded to close the entrance of the annealing furnace 9, the command is directed to the annealing furnace 9, the heater 9a is operated, and "annealing" is performed on the laminated core 3. Thereafter, in the same manner, every time processing in each section is completed, the transport jig 6 on which the laminated iron core 3 and the plate 5 are placed is transferred to the next section, and the next processing is performed. When all the processes are completed, the transfer jig 6 on which the laminated core 3 and the plate 5 are placed is transferred to the carry-out unit 4.

Next, the detailed structure of the conveyance jig 6 used in the heat treatment apparatus 1 will be described. The conveying jig 6 is made of heat-resistant cast steel. As shown in FIG. 2A, the conveying jig 6 is supported by an outer frame 6a that forms a contour in a planar shape, and both ends supported by the outer frame 6a. A plurality of oblique bars 6b are provided. The plurality of oblique bars 6b intersect with each other and form a rhombus lattice as a whole. A total of 13 support cylinders 6c are erected at the intersections of the diagonal bars 6b as shown in FIG. Around each support cylinder 6c, an annular crosspiece 6d is disposed concentrically with the support cylinder 6c. Corner pillars 6e are formed at the four corners of the outer frame 6a.

  The oblique beam 6b and the annular beam 6d are finished so that the upper surfaces thereof have the same height. In other words, all the diagonal bars 6b and the annular bars 6d are finished so as to form the same plane on the upper surface. Further, as shown in FIG. 2B, the support cylinder 6c and the corner post 6e are finished so that the upper surfaces thereof are at the same height.

  Next, the detailed configuration of the plate 5 will be described. For example, the plate 5 is cut from a flat plate made of stainless steel having a thickness of about 5 mm, and has a planar shape as shown in FIG. That is, the plate 5 is a disk having a diameter of about 250 mm, and a center hole 5a having a diameter of 130 mm is formed in the center of the disk. Four fan-shaped through holes 5b are formed around the center hole 5a, and are arranged so as to form a cross shape in a planar shape. Further, as shown in FIGS. 3A and 3B, three pins 5c are projected from the upper surface and the lower surface of the plate 5, respectively. The pin 5c has a diameter of about 8 mm and a height of about 10 mm.

  The four through holes 5b formed in the plate 5 function as vent holes that promote the flow of the atmosphere in each step of the heat treatment by the heat treatment apparatus 1. In addition, when the plate 5 is placed on an article other than the conveying jig 6 or when a plurality of plates 5 are stacked and temporarily placed, the pin 5c is attached to the other article or the other plate 5. It also functions as a spacer that is spaced apart. That is, since the plate 5 includes the pins 5c, when the plate 5 is placed on another article or when a plurality of plates 5 are stacked and temporarily placed, the surface of the plate 5 contacts the other article. There is nothing to do. Therefore, the surface of the plate 5 is less likely to be scratched or dirty. That is, damage and contamination of the plate 5 are suppressed.

  In FIG. 3A and FIG. 3B, the outline of the laminated core 3 placed on the plate 5 is indicated by an imaginary line (one-dot chain line). As is clear from this, the laminated core 3 is in surface contact with the plate 5 on all of its lower surfaces. That is, the plate 5 has a shape and a dimension such that the laminated iron core 3 is in surface contact with all of its lower surfaces.

  As shown in FIG. 4, the outer diameter D <b> 1 of the plate 5 is larger than the outer diameter d <b> 1 of the laminated core 3, and the inner diameter D <b> 2 of the plate 5 is smaller than the inner diameter d <b> 2 of the laminated core 3. The inner diameter D2 of the plate 5 is the diameter of an arc that forms the outer edge of the through hole 5b formed in the plate 5. Since the outer diameter D1 and the inner diameter D2 of the plate 5 satisfy these conditions, the planar shape of the laminated core 3 is included in the planar shape of the plate 5, and all the lower surfaces of the laminated core 3 face the plate 5. Can be contacted. In this specification, “surface contact” and “surface support” refer to “a state that can be regarded as a surface contact for practical use” and “a state that can be regarded as a surface support for practical use”. For example, even if there is a minute strain that is practically acceptable on the lower surface of the laminated iron core 3 and a part of the lower surface of the laminated iron core 3 does not come into contact with the plate 5, “practically it can be regarded as surface contact. Corresponds to "state".

  Further, the three pins 5 c erected on the upper surface of the plate 5 are arranged so as to be in contact with the outer contour of the laminated core 3. That is, the three pins 5c are arranged at a position circumscribing a circle having a diameter d1 (= the outer diameter of the laminated core 3). Therefore, if the laminated core 3 is placed on the plate 5 so that the outer periphery of the laminated core 3 is in contact with all three pins 5c, the laminated core 3 is positioned with respect to the plate 5. Thus, the three pins 5c erected on the upper surface of the plate 5 are arranged so as to function as a workpiece positioning portion of the present invention and further as a fall prevention portion for the workpiece from the plate 5. ing. However, in reality, the three pins 5c have a minute gap corresponding to so-called “play” between the circles having a diameter d1. This is because the laminated iron core 3 cannot be attached or detached without “play”. That is, in this specification, “external circumstance” refers to “a state that can be regarded as circumscribed practically”. In addition, the site | part of the laminated iron core 3 used as the reference | standard of positioning by the pin 5c is not limited to said outer periphery outline. Positioning can be performed with reference to any part of the laminated core 3 such as slots, bolt ear holes, magnet insertion holes, and lightening holes.

  As described above, the support cylinder 6 c of the conveying jig 6 is fitted with the plate 5. At this time, the support cylinder 6 c is fitted into the center hole 5 a of the plate 5. The plate 5 is positioned with respect to the transport jig 6 by fitting the support cylinder 6c of the transport jig 6 into the center hole 5a. Thus, the center hole 5a functions as a plate positioning part of the present invention.

  The plate 5 is placed on the conveying jig 6 as shown in FIG. That is, 13 plates 5 are placed on the transport jig 6. As described above, since the plate 5 is positioned with respect to the transport jig 6 by fitting the support cylinder 6c of the transport jig 6 into the center hole 5a, the plate 5 is transported in this state. There is no position shift with respect to the tool 6. As shown in FIG. 5, two of the three pins 5 c erected on the lower surface of the plate 5 abut against the diagonal beam 6 b and function as a detent for the conveying jig 6 of the plate 5. . In addition, the plate 5 is in contact with and supported by the oblique beam 6 b and the annular beam 6 d, so that the plate 5 is stable with respect to the conveying jig 6. That is, the plate 5 placed on the conveying jig 6 does not tilt, and further, the plate 5 does not fall from the conveying jig 6.

  As described above, the plate 5 is placed on the conveying jig 6, and the laminated core 3 is placed on the plate 5. In this state, the laminated iron core 3 is carried into the carry-in part 2 of the heat treatment apparatus 1 and subjected to heat treatment. Therefore, the following effects are produced.

(1) Since the laminated iron core 3 is in surface contact with the plate 5, the support reaction force received by the laminated iron core 3 is distributed over the entire lower surface of the laminated iron core 3. That is, since no concentrated load is generated in the laminated core 3, deformation of the laminated core 3 during the heat treatment process is suppressed. Therefore, it is possible to improve the productivity by reducing the man-hours required for correcting the deformation.

(2) The plate 5 is inserted into the center hole 5a with the support cylinder 6c of the conveying jig 6, and the pin 5c erected on the lower surface of the plate 5 abuts against the oblique beam 6b to function as a detent. Therefore, the plate 5 does not move greatly with respect to the conveying jig 6. Further, since the outer peripheral contour of the laminated core 3 is in contact with the three pins 5 c erected on the upper surface of the plate 5, the laminated core 3 does not move greatly with respect to the plate 5. Therefore, the laminated iron core 3 does not move greatly with respect to the plate 5 and the conveying jig 6 during conveyance and heat treatment, so that it is possible to prevent the laminated iron core 3 from being scratched.

(3) If the state of the surface of the plate 5 is kept good by cleaning or polishing the surface of the plate 5, contamination of the laminated core 3 during conveyance and heat treatment can be prevented or suppressed. In addition, since the cleaning and polishing of the plate 5 is easier than the cleaning and polishing of the entire conveying jig 6, the number of steps can be reduced.

(Modification)
In the said embodiment, although the conveyance jig 6 in which the plate 5 and the lamination | stacking iron core 3 were mounted was carried into the heat processing apparatus 1 one by one, the example which heat-processes the lamination | stacking iron core 3 was shown, However, It concerns on this invention The heat treatment method is not limited to such a method. As shown in FIG. 6, six transfer jigs 6 may be stacked, that is, stacked in six stages, and may be carried together into the carry-in section 2 of the heat treatment apparatus 1. The conveyance jig 6 includes a corner post 6e, and the upper surface of the corner post 6e is configured to be higher than the laminated core 3 placed on the conveyance jig 6, so that the conveyance jig 6 is stepped. Even when stacked, the laminated iron core 3 does not interfere with the conveying jig 6 placed on the upper layer. In FIG. 6, the base 15 is a gantry for holding the transport jig 6 stacked in six stages.

  In the said embodiment, positioning the plate 5 with respect to the conveyance jig 6 was illustrated by making the support cylinder 6c of the conveyance jig 6 fit in the center hole 5a of the plate 5. FIG. That is, although the center hole 5a is exemplified as the plate positioning portion, the plate positioning portion is not limited to this. Moreover, the positioning of the laminated iron core 3 with respect to the plate 5 is exemplified by the pins 5 c erected on the upper surface of the plate 5. That is, although the pin 5c erected on the upper surface of the plate 5 is exemplified as the workpiece positioning portion, the workpiece positioning portion is not limited to this. For example, as shown in FIGS. 7 (a) and 7 (b), four pairs of pins 5c are erected on the lower surface of the plate 5, and the diagonal beam 6b of the conveying jig 6 is formed with the pair of pins 5c. The plate 5 may be positioned with respect to the transport jig 6 by sandwiching. That is, four pairs of pins 5c erected on the lower surface of the plate 5 may be used as the plate positioning portion. Further, instead of standing the pin 5c on the upper surface of the plate 5, a concave portion 5d in which the laminated core 3 is fitted is formed on the upper surface of the plate 5, and the laminated core 3 is fitted into the concave portion 5d, thereby forming the laminated core. 3 may be positioned relative to the plate 5. That is, the recessed portion 5d may be used as the workpiece positioning portion.

  If the plate 5 is configured as shown in FIG. 7, the support cylinder 6 c of the conveying jig 6 becomes unnecessary. Moreover, in the plate 5, the dimension of the center hole 5a can be enlarged. For this reason, the flow of the atmosphere in the heat treatment furnace or the like is promoted, and the efficiency or quality of the heat treatment is improved. Further, since the recess 5d is formed on the upper surface of the plate 5 instead of standing the pins 5c, no protrusions are present on the upper surface of the plate 5. Therefore, cleaning of the upper surface of the plate 5 is facilitated.

  Moreover, in the said embodiment, although the example where all the lower surfaces of the laminated iron core 3 contact | abuts to the plate 5 was shown, it is enough for the laminated iron core 3 to be in surface contact with the plate 5 as a whole. A part may be separated from the plate 5. It is sufficient if approximately 70% or more of the lower surface of the laminated core 3 is in surface contact with the plate 5. As described above, “surface contact” refers to “a state in which surface contact can be considered practically”. For example, as shown in FIG. 8 (a), the diameter of the center hole 5a of the plate 5 is made larger than the inner diameter of the laminated iron core 3 so that the laminated iron core 3 overhangs the plate 5 on the inner diameter side. Also good. Further, as shown in FIG. 8B, the outer diameter of the plate 5 is made smaller than the outer diameter of the laminated core 3 so that the laminated core 3 overhangs the plate 5 on the outer diameter side. good.

  Further, it is optional to add an additional structure to the plate 5. For example, as shown in FIG. 9, a small recess 5e may be formed by digging down a part of the surface of the plate 5 that contacts the laminated core 3 (here, the bottom surface of the recess 5d). The small concave portion 5 e functions as a recess that accommodates a small convex portion (for example, a protruding portion formed by caulking) on the lower surface of the laminated core 3.

  As mentioned above, although each embodiment and modification of this invention were demonstrated, these illustrate the specific embodiment of this invention, and do not delimit the technical scope of this invention. The present invention can be freely modified, applied or improved within the scope of the technical idea described in the claims.

  For example, in the description of the above-described embodiment, the laminated iron core 3 is illustrated as an object to be heat treated, but the object of the heat treatment according to the present invention is not limited to the laminated iron core 3. The present invention can be applied to various objects to be processed.

  Moreover, in the said embodiment, although the laminated iron core 3 which has what is called a donut shape planar shape was illustrated, the shape of the to-be-processed object which concerns on this invention is not limited to this. The shape of the object to be processed may be a rectangle or other shapes. For example, there is a stator iron core of a rotating electrical machine that has a substantially rectangular shape in a planar shape, and a transformer iron core generally has a substantially rectangular shape in a planar shape. The present invention can also be applied to such an object to be processed.

  The shape of the plate 5 in the above embodiment is also an example, and the shape of the plate according to the present invention is not limited to this. Since the shape of the plate is mainly selected according to the shape of the workpiece, various plates having different shapes are used in the practice of the present invention.

  The shape of the conveying jig 6 in the above embodiment is also an example, and the shape of the conveying jig according to the present invention is not limited to this. In carrying out the present invention, various conveying jigs having different shapes are used. If the shape of the conveying jig is different, the shape of the plate 5 is naturally changed.

  Further, the materials and structures of the plate and the conveying jig are not limited to those exemplified in the above embodiment. For example, various materials and structures can be selected according to the physical and chemical properties of the object to be processed, the kind of heat treatment, or the temperature condition.

  Moreover, in the said embodiment, although the continuous heat processing apparatus was illustrated as a heat processing apparatus, this invention is applicable also to a batch type heat processing apparatus.

DESCRIPTION OF SYMBOLS 1 Heat processing apparatus 2 Carry-in part 3 Laminated iron core 4 Carry-out part 5 Plate 5a Center hole 5b Through-hole 5c Pin 5d Recessed part 5e Small recessed part 6 Conveying jig 6a Outer frame 6b Oblique frame 6c Supporting cylinder 6d Annular beam 6e Corner pillar 7 Conveying device 7a Drive sprocket wheel 7b Driven sprocket wheel 7c Slat 8 Deoiling furnace 8a Heater 8b Discharge cylinder 8c Discharge cylinder 9 Annealing furnace 9a Heater 10 First cooling section 10a Intake cylinder 10b Exhaust cylinder 11 Brewing furnace 11a Heater 11b Gas supply nozzle 12 Second Cooling unit 12a Intake cylinder 12b Exhaust cylinder 13 (13a to 13f) Shutter 14 Control device 15 Base D1 Plate outer diameter D2 Plate inner diameter d1 Laminated iron core outer diameter d2 Laminated iron core inner diameter

Claims (11)

Place the plate on the transfer jig,
Further, the object to be processed is placed on the plate, and the object to be processed is surface-supported on the plate,
Bring the transport jig into a heat treatment furnace,
A heat treatment method for heating or cooling the workpiece. Laminating a plurality of the conveying jigs,
Bring it into the heat treatment furnace,
The heat treatment method according to claim 1, wherein the object to be processed is heated or cooled. The heat treatment method according to claim 1, wherein the object to be processed is a laminated iron core. The heat treatment method according to any one of claims 1 to 3, wherein the heat treatment furnace is any one of a deoiling furnace, an annealing furnace, and a bluing furnace. A plate on which a workpiece is placed and placed on a transport jig that transports the workpiece to a heat treatment furnace,
A plate on which the object to be processed is placed to support the object to be processed. The plate according to claim 5, comprising a through-hole penetrating from the upper surface to the lower surface, through which an atmosphere passes when the plate is placed on the transport jig. The plate according to claim 5, further comprising a plate positioning portion that positions the plate with respect to the conveyance jig. The plate according to claim 7, wherein the plate positioning portion is a protruding member that protrudes from a lower surface of the plate and engages with the conveying jig. The plate as described in any one of Claims 5 thru | or 8 provided with the to-be-processed object positioning part which positions the said to-be-processed object with respect to the said plate. The plate according to claim 9, wherein the workpiece positioning portion is a recess formed on an upper surface of the plate and fitted with the workpiece. The plate according to claim 9, wherein the processing object positioning portion is a protruding member that protrudes from an upper surface of the plate and engages with the processing object.

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