JP6517015B2 - Heat treatment method and plate - Google Patents

Description

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

  The heat treatment is a general term for a treatment that changes the property of the object by heating or cooling. The heat treatment includes, for example, quenching, tempering, annealing, normalizing, oil-baking, blackening and the like. It is also well known that a large number of objects to be treated are placed on a transfer jig, carried into a heat treatment furnace, subjected to heat treatment, and then taken out or carried to the next step (for example, patent documents) 1). The transport jig is also called a tray or a pallet, and is generally configured in a grid shape so that the objects to be treated are uniformly heated and cooled (for example, Patent Documents 1, 2, and 3).

Now, for example, various heat treatments are applied to a laminated core such as an armature core of a motor or a generator in the manufacturing process. For example, oil baking, annealing, blackening treatment, etc. are applied. Oil baking is a process which evaporates and removes oil components, such as stamping oil, which adhered to the surface of the blank in the processing step. Annealing, also referred to as annealing, is a process for removing strain and internal stress of a blank (for example, Patent Document 4). The blackening treatment is also called bluing, and is a treatment to form a coating (so-called black rust) of triiron tetraoxide (Fe ₃ O ₄ ) on the surface of the base plate for corrosion prevention. Oil-baking, annealing, and blackening may be applied continuously. For example, in FIG. 1 of Patent Document 5, a continuous annealing and bluing apparatus is used to carry in and out an object to be processed by connecting a deoiling furnace 2, an annealing furnace 3, and a bluing furnace 4 by the feed passage 1. 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 7-42508

  As described above, in general, the transfer jig is configured in a grid shape. When an object to be treated (for example, a laminated iron core) is placed on such a conveyance jig, a supporting reaction force which the object to be treated receives from the conveyance jig is concentrated on a portion of the conveyance jig which abuts on a grid. An object to be treated such as a laminated core is generally considered to be an object that is difficult to deform, but even with such an object, the material softens at high temperatures, so the object tends to deform. Therefore, when heat treatment is performed using a conventional transfer jig, there is a problem that the object to be treated is easily deformed in the process.

  Moreover, since the conventional conveyance jig does not have means for constraining the displacement of the object to be treated, the object to be treated is displaced on the conveyance jig during conveyance or processing, and the object to be treated is rubbed by the conveyance jig. Sometimes. Therefore, when heat treatment is performed using a conventional transfer jig, there is also a problem that the object to be treated is scratched. In addition, there is also a problem that the rust or dirt is transferred to the object to be processed when the surface of the transfer jig is rusted or dirt.

  The present invention has been made in view of such circumstances, and provides a heat treatment method in which deformation of an object to be treated is less likely to occur in a process or a transfer process, and scars and stains are less likely to occur on the surface of an object to be treated. The purpose is Another object of the present invention is to provide a plate used in the heat treatment method.

In order to solve the above problems, the heat treatment method according to the first aspect of the present invention, by placing the plate on the conveying jig, and further placing the laminated core on the plate, the plate laminated core is a surface supported Rutotomoni, on the conveying jig plate and laminated iron core is placed, it is placed another transport jig plate and laminated iron core is placed, a plurality of conveying jigs and laminated together to form a laminate of the transfer jig, and loaded into an annealing furnace a stack of conveying jig is configured to heat or cool the laminated core.

The heat treatment furnace is, for example, a deoiling furnace, an annealing furnace, or a brewing furnace.

Plate according to the second aspect of the present invention, the laminated iron core is placed, a laminated core with a surface supporting a plate placed on the conveying jig for transporting the laminated core in a heat treatment furnace, the transport The support part which protrudes from a jig is inserted, and the through-hole which positions a plate with respect to a conveyance jig is provided .

A through hole penetrating from the upper surface to the lower surface, when placing the Plate on transportable oct tool may be provided with a Toruana the atmosphere through the plate. Further, it protruded from the lower surface of the Plate, and engage the conveying jig may be provided with a protruding member for positioning with respect to the conveying jig plate.

A workpiece positioning unit may be provided to position the laminated core relative to the plate. The workpiece positioning portion is, for example, a concave portion formed on the upper surface of the plate and fitted into the laminated core , or a projecting member projecting from the upper surface of the plate and engaged with the laminated core .

According to the present invention, a laminated core because the face supporting the plate, the support reaction force laminated core is subjected is distributed throughout the laminated core. Therefore, deformation is less likely to occur during heat treatment. In addition, since the laminated core does not directly contact the transfer jig, damage and contamination caused by the contact with the transfer jig are less likely to occur in the laminated core . As a result, the quality of the heat treated laminated core is improved.

It is a conceptual sectional view showing composition of a heat treatment apparatus concerning an embodiment of the present invention. It is an outline view of a conveyance jig used in heat treatment equipment given in Drawing 1, and (a) is a top view and (b) is an elevation. It is an external view of the plate mounted in the conveyance jig | tool of FIG. 2, (a) is a top view, (b) is an elevation view. It is explanatory drawing explaining the internal-and-external diameter of the laminated iron core mounted in the plate of FIG. 3, and a plate. It is a top view which shows the state which mounted the plate of FIG. 3 in the conveyance jig of FIG. It is an elevation view which shows the state which accumulated 6 steps of conveyance jigs shown in FIG. It is an outline drawing of a plate concerning a modification, (a) is a top view and (b) is a sectional view cut by the A-A 'line of (a). It is a top view which compares the shape of the plate and laminated core concerning another modification, and (a) is an example where a laminated core overhangs to a plate in the inside diameter side, (b) is a laminated core in the outside diameter side The example which overhangs with respect to a plate is shown, respectively. 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 exemplified. A laminated core is illustrated as a specific example of a to-be-processed object.

  FIG. 1 is a conceptual cross-sectional view showing the configuration of a heat treatment apparatus 1 that performs a 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 described later on the laminated iron core 3 carried into the carry-in unit 2 and carries it out to the carry-out unit 4.

  The laminated core 3 is an iron core that constitutes an armature of a rotary motor. The laminated core 3 is configured by laminating a plurality of base plates formed by punching out so-called electromagnetic steel thin plates with a press in a separate process (not shown) and bonding them together by caulking or the like. The laminated core 3 is placed on the transfer jig 6 in a pre-process not shown, but before that, the plate 5 is placed on the transfer jig 6, and then the laminated core 3 is placed on the plate 5. Is placed. The laminated core 3 is carried into the carry-in unit 2 in this state, that is, in a state of being placed on the plate 5 placed on the transfer jig 6. Then, the laminated core 3 is carried out to the carry-out unit 4 through the inside of various heat treatment furnaces and the like which will be described later. The detailed configurations of the plate 5 and the transfer jig 6 will be described later.

  The heat treatment apparatus 1 includes a transfer device 7 that transfers the laminated core 3 (the plate 5 on which the stacked core 3 is mounted and the transfer jig 6) from the loading unit 2 to the unloading unit 4. Further, a deoiling furnace 8, an annealing furnace 9, a first cooling unit 10, a brewing furnace 11, and a second cooling unit 12 are disposed in series between the loading unit 2 and the unloading unit 4. Further, shutters 13 (13 a to 13 f) are disposed at the inlet of the deoiling furnace 8, the outlet of the second cooling unit 12, and the boundary between the oil removing furnace 8 and the second cooling unit 12.

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

  The oil removal furnace 8 is a heat treatment furnace that evaporates the oil adhering to the base plate forming the laminated core 3 in the punching process, that is, the heat treatment furnace that performs so-called “oil baking” on the laminated core 3. Inside the oil removal furnace 8, the heater 8a which raises the laminated core 3 to oil removal temperature (about 300-400 degreeC) is arrange | positioned. Further, discharge cylinders 8b and 8c are disposed at the front and rear ends of the oil removal furnace 8, and oil components heated and evaporated by the heater 8a are discharged to the outside through the discharge cylinders 8b and 8c. The oil removing furnace 8 is disposed adjacent to the loading unit 2, and a shutter 13 a is disposed between the oil removing furnace 8 and the loading unit 2.

  Annealing furnace 9 is a heat treatment furnace that heats and anneals laminated core 3. Inside the annealing furnace 9, the heater 9a which raises the laminated core 3 to annealing temperature (for example, 800 degreeC vicinity), and is hold | maintained is arrange | positioned. The annealing furnace 9 is disposed at the end of the deoiling furnace 8, and the shutter 13 b is disposed between the annealing furnace 9 and the deoiling furnace 8.

The first cooling unit 10 is a section for cooling the laminated core 3 after annealing to a temperature suitable for the initiation of the brewing. The first cooling unit 10 is provided with an intake cylinder 10a for taking in cooling air from the outside, and an exhaust cylinder 10b for discharging the cooling air which is absorbed by heat from the laminated core 3 and discharged to the outside. The first cooling unit 10 is disposed at the end of the annealing furnace 9, and the shutter 13 c is disposed between the annealing furnace 9 and the first cooling unit 10 .

The bluing furnace 11 is a heat treatment furnace that forms a coating of triiron tetraoxide (Fe ₃ O ₄ ) on the surface of the laminated core 3. Inside the bluing furnace 11, 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 are disposed. ing. The brewing furnace 11 is disposed at the tip of the first cooling unit 10, and the shutter 13d is disposed between the brewing furnace 11 and the first cooling unit 10.

  The second cooling unit 12 is a section that cools the laminated core 3 whose brewing has ended to normal temperature. The second cooling unit 12 is provided with an intake cylinder 12a that takes in cooling air from the outside, and an exhaust cylinder 12b that discharges the cooling air that is heated by heat absorption from the laminated core 3 to the outside. The second cooling unit 12 is disposed at the tip of the brewing furnace 11, and the shutter 13 e is disposed between the second cooling unit 12 and the brewing furnace 11. Further, the discharge unit 4 is disposed at the end of the second cooling unit 12, and the shutter 13 f is disposed between the second cooling unit 12 and the discharge unit 4.

  The shutters 13 (13a to 13f) are devices for preventing the inflow of the atmosphere inside each section (deoiling furnace 8 to the second cooling unit 12) to the other sections and the outflow to the outside. The shutter 13 includes a main body (shield) and an actuator (for example, an air cylinder) (not shown) that raises and lowers the shield. In addition, in FIG. 1, the shutter 13a disposed at the inlet of the deoiling furnace 8 shows a state in which the shielding plate is lifted, that is, a state in which the inlet of the deoiling furnace 8 is opened. The other shutters 13b to 13f show a state in which the shielding plate is lowered, that is, a state in which the boundaries of the sections are closed.

  The heat treatment apparatus 1 is controlled by a controller 14 including a computer (not shown). The control device 14 executes a program stored in a computer to control the transport device 7. For example, the control device 14 executes a program stored in a computer to open and close the shutters 13 (13a to 13f), operate the oil removal furnace 8, the annealing furnace 9, and the brewing furnace 11, and the first cooling unit The flow rate of the cooling air supplied to the 10 and the second cooling unit 12 is adjusted.

The heat treatment apparatus 1 is generally operated in the following sequence. First, operator, using a hoist not shown FIG. For example, or robot, it is carries the conveying jig 6 laminated core 3 and the plate 5 is placed on the loading 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 inlet of the oil removal furnace 8 to open the inlet of the oil removal furnace 8 and instructs the transfer device 7 to form the laminated core The transfer jig 6 on which the plate 3 and the plate 5 are placed is transferred to the inside of the deoiling furnace 8. Thereafter, the control device 14 instructs the shutter 13a to close the inlet of the deoiling furnace 8 and instructs the deoiling furnace 8 to operate the heater 8a, and the laminated iron core 3 placed on the transfer jig 6 Remove the oil adhering to the That is, the “oil-baked” is applied to the laminated 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 and cure the laminated iron core 3 and the plate 5 mounted. The tool 6 is transferred to the inside of the annealing furnace 9. Then, the shutter 13b is instructed to close the entrance of the annealing furnace 9, and the annealing furnace 9 is operated to operate the heater 9a to "anneal" the laminated iron core 3. Thereafter, similarly, every time the processing in each section is finished, the transport jig 6 on which the laminated core 3 and the plate 5 are placed is transferred to the next section, and the next processing is performed. After all the processing is completed, the transport jig 6 on which the laminated core 3 and the plate 5 are placed is transferred to the unloading unit 4.

Next, the detailed structure of the transfer jig 6 used in the heat treatment apparatus 1 will be described. The conveying jig 6 is made of heat-resistant cast steel, and as shown in FIG. 2A, the conveying jig 6 is supported by an outer frame 6a forming a contour in a flat shape and both ends by the outer frame 6a. A plurality of diagonal bars 6b are provided. The plurality of diagonal bars 6b intersect with each other to form a rhombic lattice as a whole. A total of 13 support cylinders 6c are erected as shown in FIG. 2 (b) at the intersections of the diagonal bars 6b. An annular crosspiece 6d is disposed concentrically with the support cylinder 6c around each support cylinder 6c. In addition, corner posts 6e are formed at the four corners of the outer frame 6a.

  The oblique crosspieces 6b and the annular crosspieces 6d are finished so that the upper surfaces thereof have the same height. That is, all the diagonal bars 6b and the annular bars 6d are finished to form the same plane on the upper surface. Further, as shown in FIG. 2 (b), the support cylinder 6c and the corner post 6e are finished so that the upper surfaces thereof have the same height.

  Next, the detailed configuration of the plate 5 will be described. The plate 5 is cut out of, for example, a flat plate of stainless steel having a thickness of about 5 mm, and has a planar shape as shown in FIG. 3 (a). That is, the plate 5 is a disk having a diameter of about 250 mm, and a central hole 5a having a diameter of 130 mm is drilled at the center of the disk. Four fan-shaped through holes 5b are formed around the center hole 5a, and are arranged to form a cruciform in plan view. Further, as shown in FIGS. 3A and 3B, three pins 5c are provided on the upper surface and the lower surface of the plate 5, respectively. In addition, the diameter of the pin 5c is about 8 mm, and the height is about 10 mm.

  The four through holes 5 b formed in the plate 5 function as vent holes for promoting 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 transport jig 6 or when a plurality of plates 5 are stacked and temporarily placed, the pins 5 c may be used to mount the plate 5 to another article or the other plate 5. It also functions as a separate spacer. That is, since the plate 5 is provided with the pins 5c, the surface of the plate 5 contacts other articles etc. when placing the plate 5 on other articles etc. or when stacking a plurality of plates 5 and temporarily placing them. There is nothing to do. Therefore, the surface of the plate 5 is less likely to be scratched or stained. That is, damage and contamination of the plate 5 are suppressed.

  In FIG. 3 (a) and FIG.3 (b), the outline of the laminated core 3 mounted in the plate 5 is displayed with an imaginary line (one-dot chain line). As is apparent 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 such a shape and dimensions that the laminated core 3 is in surface contact on all of the lower surfaces thereof.

  As shown in FIG. 4, the outer diameter D1 of the plate 5 is larger than the outer diameter d1 of the laminated core 3, and the inner diameter D2 of the plate 5 is smaller than the inner diameter d2 of the laminated core 3. The inner diameter D2 of the plate 5 is the diameter of a circular arc forming 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 such conditions, the planar shape of the laminated core 3 is included in the planar shape of the plate 5, and all of the lower surface of the laminated core 3 is the plate 5 It can be in contact. In the present specification, "surface contact" and "surface support" refer to "a state in which it can be practically considered as a surface contact" and "a state in which it can be practically regarded as a surface support". For example, even if there is a practically acceptable small distortion on the lower surface of the laminated core 3 and a part of the lower surface of the laminated core 3 does not contact the plate 5, it can be practically regarded as surface contact Corresponds to the state.

Further, the three pins 5 c erected on the upper surface of the plate 5 are arranged to be in contact with the contour of the outer periphery of the laminated core 3. That is, the three pins 5c are disposed at positions circumscribing the circle of the diameter d1 (= the outer diameter of the laminated core 3). Therefore, when the laminated core 3 is placed on the plate 5 such that the outline of the outer periphery of the laminated core 3 contacts all three pins 5 c, the laminated core 3 is positioned relative to the plate 5. Thus, the three pins 5c erected on the upper surface of the plate 5 are arranged to function as the object positioning portion of the present invention and also as a drop prevention portion of the object from the plate 5. ing. However, between the actually three pins 5c and the circle of diameter d1, there is a small gap, which corresponds to the so-called "play". This is because the laminated core 3 can not be attached or detached without "play". That is, in the present specification, the term "periphery" refers to "a state that can be regarded as practically circumscribing." 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 an arbitrary portion 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 transport jig 6 is fitted with the plate 5, but 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 inserting the support cylinder 6 c of the transport jig 6 into the center hole 5 a. Thus, the central hole 5a functions as the plate positioning portion of the present invention.

  The plate 5 is placed on the transfer jig 6 as shown in FIG. That is, 13 plates 5 are placed on the transfer jig 6. As described above, the plate 5 is positioned relative to the transport jig 6 by inserting the support cylinder 6c of the transport jig 6 into the center hole 5a, so that the plate 5 is transported in this state. There is no misalignment with the tool 6. As shown in FIG. 5, two of the three pins 5c erected on the lower surface of the plate 5 abut the diagonal crosspiece 6b and function as a rotation stopper for the plate 5 with respect to the transfer jig 6 . Further, since the plate 5 is supported in contact with the oblique crosspiece 6b and the annular crosspiece 6d, the plate 5 is stable relative to the transport jig 6. That is, the plate 5 placed on the transport jig 6 does not tilt, and furthermore, the plate 5 does not fall from the transport jig 6.

  Thus, the plate 5 is placed on the transfer jig 6, and the laminated core 3 is placed on the plate 5. In this state, the laminated core 3 is carried into the carry-in unit 2 of the heat treatment apparatus 1 and heat-treated. Therefore, the following effects occur.

(1) Since the laminated core 3 is in surface contact with the plate 5, the supporting reaction force received by the laminated core 3 is dispersed over the entire lower surface of the laminated core 3. That is, since no concentrated load is generated in the laminated core 3, deformation of the laminated core 3 in the heat treatment process is suppressed. Therefore, it is possible to improve the productivity by reducing the number of steps required for the correction of the deformation and the like.

(2) In the plate 5, the support cylinder 6c of the transfer jig 6 is inserted into the center hole 5a, and the pin 5c erected on the lower surface of the plate 5 abuts against the diagonal rail 6b and functions as a rotation stopper Therefore, the plate 5 does not move much with respect to the transfer jig 6. Further, since the contour of the outer periphery 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 significantly with respect to the plate 5. Therefore, since the laminated iron core 3 does not move largely with respect to the plate 5 and the conveyance jig 6 during conveyance and heat treatment, it is possible to suppress the occurrence of scratches on the laminated iron core 3.

(3) By washing or polishing the surface of the plate 5, if the surface condition of the plate 5 is kept good, it is possible to prevent or suppress fouling of the laminated core 3 during transportation and heat treatment. Further, since cleaning and polishing of the plate 5 are easier than cleaning and polishing of the entire transport jig 6, the number of man-hours can be reduced.

(Modification)
In the above embodiment, an example has been shown in which the transfer iron 6 on which the plate 5 and the laminated core 3 are placed is carried into the heat treatment apparatus 1 one by one and the laminated iron core 3 is subjected to heat treatment. The heat treatment method is not limited to such. As shown in FIG. 6, six transport jigs 6 may be stacked, that is, stacked in six stages, and collectively loaded into the loading unit 2 of the heat treatment apparatus 1. The conveyance jig 6 is provided with a corner post 6e, and the upper surface of the corner post 6e is configured to be higher than the laminated iron core 3 placed on the conveyance jig 6, so Even if stacked, the laminated iron core 3 does not interfere with the transfer jig 6 placed in the upper layer. In FIG. 6, the base 15 is a pedestal for holding the transport jigs 6 stacked in six stages.

  In the above embodiment, the support cylinder 6 c of the transfer jig 6 is inserted into the center hole 5 a of the plate 5 to position the plate 5 with respect to the transfer jig 6. That is, although illustrated as making the center hole 5a into a plate positioning part, the plate positioning part is not limited to this. Moreover, positioning of the laminated core 3 with respect to the plate 5 by the pin 5 c provided upright on the upper surface of the plate 5 was illustrated. That is, although illustrated using the pin 5c erected in the upper surface of the plate 5 as a to-be-processed object positioning part, a to-be-processed object positioning part 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 pair of pins 5c is a diagonal rail 6b of the transfer jig 6. The plate 5 may be positioned relative to the transport jig 6 by holding the That is, a pair of four sets of pins 5c provided upright on the lower surface of the plate 5 may be used as the plate positioning portion. Further, instead of erecting the pins 5c on the upper surface of the plate 5, a recessed 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 to the recessed portion 5d. 3 may be positioned relative to the plate 5. That is, the recess 5d may be used as the object positioning portion.

  If the plate 5 is configured as shown in FIG. 7, the support cylinder 6c of the transfer jig 6 becomes unnecessary. Further, in the plate 5, the size of the central hole 5a can be enlarged. Therefore, the flow of the atmosphere in the heat treatment furnace or the like is promoted, and the efficiency or the quality of the heat treatment is improved. Further, since the recess 5 d is formed instead of erecting the pin 5 c on the upper surface of the plate 5, no protrusion is present on the upper surface of the plate 5. Therefore, cleaning and the like of the upper surface of the plate 5 become easy.

  Moreover, in the said embodiment, although the example which all the lower surfaces of the laminated core 3 contact | abut in the plate 5 was shown, it is sufficient if the laminated core 3 surface-contacts the plate 5 as a whole, A part may be separated from the plate 5. It is sufficient that 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" means "a state in which it can be regarded as surface contact in practical use." For example, as shown in FIG. 8A, the diameter of the center hole 5a of the plate 5 is made larger than the inner diameter of the laminated core 3 so that the laminated 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.

  Also, the addition of an additional configuration to the plate 5 is optional. For example, as shown in FIG. 9, a small recess 5e may be formed by digging a part of the surface of the plate 5 in contact with the laminated core 3 (here, the bottom of the recess 5d). The small recess 5 e functions as a recess for receiving the small protrusion (for example, a protrusion formed by caulking) on the lower surface of the laminated core 3.

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

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

  Moreover, in the said embodiment, although the laminated iron core 3 which has the so-called donut-shaped 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 treated may be rectangular or any other shape. For example, there is a stator core of a rotating electrical machine which has a substantially rectangular shape in a planar shape, and a transformer core generally has a substantially rectangular shape in a planar shape. The present invention can also be applied to such an object to be treated.

  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 plates is mainly selected in accordance with the shape of the object to be treated, various plates of different shapes are used in the practice of the present invention.

  The shape of the transfer jig 6 in the above embodiment is also an example, and the shape of the transfer jig according to the present invention is not limited to this. In the practice of the present invention, various transfer jigs of different shapes are used. Also, if the shape of the transfer jig is different, the shape of the plate 5 is naturally changed.

  Moreover, the raw material and structure of a plate and a conveyance jig are not limited to what was illustrated in the said embodiment. For example, various materials and structures can be selected according to the physical and chemical properties of the object to be treated, the type of heat treatment, or the temperature conditions.

  Moreover, in the said embodiment, although the continuous-type 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 carrying-in part 3 laminated iron core 4 unloading part 5 plate 5a center hole 5c through hole 5c pin 5d recessed part 5e small recessed part 6 conveyance jig 6a outer frame 6b diagonal crosspiece 6c support cylinder 6d annular crosspiece 6e corner post 7 conveyance device 7a Drive sprocket wheel 7b Driven sprocket wheel 7c Slat 8 Degreasing furnace 8a Heater 8b Discharge cylinder 8c Discharge cylinder 9 Annealing furnace 9a Heater 10 1st cooling unit 10a Intake cylinder 10b Exhaust cylinder 11 Blewing furnace 11a Heater 11b Gas supply nozzle 12 second Cooling part 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 (8)

Place the plate on the transport jig,
Additionally by placing the laminated core on the plate, Rutotomoni to face supporting said laminated core to said plate,
On the transfer jig on which the plate and the laminated core are mounted, another transfer jig on which the plate and the laminated core are mounted is placed, and a plurality of the transfer jigs are obtained. Laminating on each other to form a laminate of the transport jig;
And it carries the stack of the transfer jig into the heat treatment furnace,
A heat treatment method of heating or cooling the laminated core . The heat treatment furnace is any of a deoiling furnace, an annealing furnace or a brewing furnace .
The heat treatment method according to claim 1 . It is a plate on which a laminated core is placed and supported on the surface of the laminated core and mounted on a transfer jig for transferring the laminated core to a heat treatment furnace,
A support portion protruding from the transfer jig is inserted and provided with a through hole for positioning the plate with respect to the transfer jig;
plate. A through hole penetrating from the upper surface to the lower surface, provided with a through hole through which the atmosphere passes when the plate is placed on the transfer jig ;
The plate of claim 3 . Protrude from the lower surface of the front Symbol plates, and engaged with the transfer jig comprises a protruding member for positioning the plate relative to the transfer jig,
The plate of Claim 3 or Claim 4 . An object positioning unit for positioning the laminated core relative to the plate ;
Plate of any one of claims 3 to 5. The object positioning portion is a recess formed on the upper surface of the plate and fitted to the laminated core .
A plate according to claim 6 . The object positioning portion is a projecting member that protrudes from the upper surface of the plate and engages with the laminated core .
A plate according to claim 6 .

Images