JP2019215159A - Heat treatment device - Google Patents

Abstract

To provide a heat treatment device which hardly stains an object to be treated by water droplets generated by dew drops and oil droplets.SOLUTION: A heat treatment device comprises a slat 6c mounted with laminated iron cores 3 and carrying in/out the laminated iron cores 3 inside an enclosure 15. The inside of the enclosure 15 is provided with a top lid face covering the laminated iron cores 3. In a cross sectional shape obtained by cutting the heat treatment device at a plane vertical in the carrying direction of the laminated iron cores 3, right and left edges of the slat 6c lie at the outside than right and left edges of the laminated iron cores 3. An oil reservoir part 16 is arranged at the outside of either or both of the right and left edges of the slat 6c, a ramp is formed at the top lid face in the cross sectional shape, and a downward inclining surface extending from a central part 15a of the ramp extends directly above the oil reservoir part 16 in the cross sectional shape.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a heat treatment apparatus that changes properties of an object to be processed by heating or cooling.

  Heat treatment is a general term for processing in which properties of an object to be processed are changed by heating or cooling. It is well known that a large number of workpieces are placed on a transfer jig, carried into a heat treatment furnace having a housing, and subjected to heat treatment (for example, Patent Document 1).

For example, a laminated iron core such as an armature iron core of a motor or a generator is manufactured by laminating base plates formed by punching a thin plate such as an electromagnetic steel plate. In the manufacturing process of such a laminated iron core, various heat treatments such as oil baking, annealing, and blackening are performed. Oil baking is a process of evaporating and removing oil such as stamping oil attached to the surface of a raw plate in a processing step. Annealing is also referred to as annealing, and is a process for removing distortion and internal stress of a base plate. The blackening process is also referred to as bluing, and is a process of forming a triiron tetroxide (Fe ₃ O ₄ ) coating (so-called black rust) on the surface of the base plate for rust prevention. Oil-baking, annealing, and blackening may be performed continuously. For example, in FIG. 1 of Patent Document 2, a continuous annealing / blowing apparatus that connects a deoiling furnace 2, an annealing furnace 3, and a bluing furnace 4 by a transmission path 1, and loads and unloads an object to and from each furnace. It has been disclosed. Further, a cooling step may be inserted between these processes (for example, Patent Document 2, air cooling mechanism 50 in FIG. 1).

JP-A-2003-113421 Japanese Patent Publication No. 7-42508

  In a heat treatment apparatus in which a plurality of heat treatment furnaces are arranged in series as disclosed in Patent Literature 2, heat treatment furnaces having different internal temperatures are arranged adjacently. Therefore, when the object is transferred between the heat treatment furnaces (that is, between the steps), the atmosphere in the heat treatment furnace flows to an adjacent heat treatment furnace or a section. When a high-temperature atmosphere flows into a heat treatment furnace or a section having a relatively low temperature, moisture or oil contained in the high-temperature atmosphere may be liquefied in a section having a low temperature. That is, dew condensation may occur. When dew condensation occurs on the ceiling surface of the heat treatment furnace, there is a problem in that water or oil drops drop and the object to be processed becomes dirty.

  In addition, in recent years, in order to improve the characteristics of the armature core, the base plates constituting the armature core tend to be thinner, and the number of laminated sheets tends to increase. As the number of layers increases, the amount of stamping oil adhering to the armature core also increases. In addition, in order to improve productivity, the punching speed is increased, or a plurality of thin plates are stacked and punched at the same time. To perform these operations, it is necessary to increase the amount of stamping oil. That is, in recent years, the amount of the stamping oil attached to the armature core (laminated core) tends to increase. Therefore, dew condensation of the stamping oil tends to easily occur in the heat treatment furnace. In addition, dew condensation does not occur only in a continuous processing furnace. Even in a single furnace, when the amount of the attached stamping oil is large, dew condensation easily occurs.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a heat treatment apparatus in which an object to be processed is less likely to be stained with water or oil droplets generated by condensation.

  In order to solve the above-described problems, a heat treatment apparatus according to the present invention includes a step of carrying a processing target object into a housing and performing a heat treatment on the processing target object. A transport means for loading and unloading the processing object into and from the housing; a housing inside the housing, a canopy surface covering the processing object, and a heat treatment apparatus in a plane perpendicular to the transport direction of the processing object. In the cut cross-sectional shape, the left and right ends of the conveying means are outside the left and right ends of the workpiece, and one or both of the right and left ends of the conveying means are provided with an oil reservoir, and A ramp is formed on the canopy surface, and a downward slope extending from the highest point of the ramp extends right above the oil reservoir in the cross-sectional shape.

  A separate housing arranged adjacent to the housing, and a shutter for opening and closing a passage communicating between the housing and the other housing, wherein a different heat treatment is performed in the housing than in the different housing. Alternatively, the ambient temperature in the housing may be relatively lower than the ambient temperature in another housing, and the transfer means may transfer the workpiece between the housing and another housing.

  The highest point of the ramp may be halfway between the left and right ends of the canopy surface, and the downward slope may be on both sides of the highest point and extend toward the left and right ends of the canopy surface.

  The highest point of the ramp may be at the left or right end of the canopy surface, and the downward slope may extend from the highest point toward the other end of the canopy surface.

  The canopy surface may be the ceiling of the housing.

  The canopy surface may be a lower surface of a roof-shaped member disposed inside the housing.

  According to the present invention, a water drop or an oil drop generated on the canopy surface is guided to the end of the canopy surface, and the water drop or the oil drop falls from the end. Can be suppressed. Therefore, the contamination of the object to be treated with water droplets and oil droplets is reduced.

It is a conceptual sectional view showing the composition of the heat treatment equipment concerning a 1st embodiment of the present invention. FIG. 2A is a cross-sectional view of the purge unit of the heat treatment apparatus illustrated in FIG. 1 taken along a line A-A ′ in FIG. 1. FIG. 3B is a cross-sectional view of the housing of the purge unit taken along line C-C ′ in FIG. FIG. 2 is a cross-sectional view of the annealing furnace of the heat treatment apparatus illustrated in FIG. 1 taken along a line B-B ′ in FIG. 1. It is explanatory drawing which shows the structure of the 1st cooling part which concerns on 2nd Embodiment of this invention, and is a cross-sectional view corresponding to FIG. It is explanatory drawing which shows the state which mounted the roof-shaped member which concerns on 3rd Embodiment of this invention in the conveyance jig. It is explanatory drawing of the housing | casing which shows the modification of this invention, Comprising: It is a cross-sectional view corresponding to FIG. (A)-(c) show each modification. It is explanatory drawing of the housing | casing which shows another modification of this invention, and is a cross-sectional view corresponding to FIG. (A)-(c) show each modification. It is explanatory drawing of the roof-shaped member which shows another modification of this invention, Comprising: It is a cross-sectional view corresponding to FIG. (A)-(d) show each modification. It is explanatory drawing of the shape of the groove | channel which shows the modification of this invention, Comprising: It is a cross-sectional view corresponding to FIG.2 (a). (A), (b) shows each modification.

  Hereinafter, a heat treatment apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. Here, a continuous furnace having a sprocket wheel and an endless chain as a transfer device is illustrated as a specific example of the heat treatment device. Further, as specific examples of the heat treatment, oil baking, annealing, blackening treatment and cooling are exemplified. As a specific example of the object to be processed, a laminated core will be exemplified.

(1st Embodiment)
FIG. 1 is a conceptual cross-sectional view illustrating a configuration of a heat treatment apparatus 1 according to the first embodiment of the present invention. The heat treatment apparatus 1 is an apparatus that performs various heat treatments described below on the laminated core 3 carried into the carry-in section 2 and carries out the heat treatment to the carry-out section 4.

  The laminated core 3 is an iron core constituting an armature of a rotary motor. The laminated core 3 is formed by laminating a plurality of base plates formed by punching a thin sheet of a so-called electromagnetic steel sheet with a press machine in a separate process (not shown), and joining the obtained plates by caulking or the like. The laminated core 3 is placed on the transport jig 5 and carried into the carry-in section 2 in a pre-process not shown. FIG. 1 shows a state in which the transport jig 5 on which the laminated core 3 is placed is stacked on the transport jig 5 on which the laminated core 3 is placed, and is placed in the loading section 2. In this state, the laminated core 3 and the transfer jig 5 are unloaded to the unloading unit 4 through various heat treatment furnaces and the like described later.

  The heat treatment apparatus 1 includes a transfer device 6 that transfers the transfer jig 5 on which the laminated core 3 is placed from the loading unit 2 to the unloading unit 4. In addition, a purge section 7, a deoiling furnace 8, an annealing furnace 9, a first cooling section 10, a brewing furnace 11, and a second cooling section 12 are arranged in series between the carry-in section 2 and the carry-out section 4. I have. Further, shutters 13 (13a to 13g) are arranged at the entrance of the purge unit 7, the exit of the second cooling unit 12, and the boundary between the purge unit 7 and the second cooling unit 12. The purging unit 7 to the second cooling unit 12 are examples of a heat treatment furnace including the housing of the present invention, and the shutters 13 (13a to 13g) are examples of gates.

  The transfer device 6 includes a driving sprocket wheel 6 a disposed in the unloading section 4 and a driven sprocket wheel 6 b disposed in the loading section 2. An endless chain (not shown) is wound between the driving sprocket wheel 6a and the driven sprocket wheel 6b, and a large number of slats 6c are arranged and attached to the endless chain in the moving direction of the endless chain. The driving sprocket wheel 6a is driven by a rotating electric motor (not shown).

  The purge unit 7 is a section for replacing air with, for example, nitrogen gas in order to perform the subsequent processing in a non-oxidizing atmosphere. For this purpose, the purge section 7 is provided with a nitrogen gas injection pipe 7a and an air discharge pipe 7b. When the transport jig 5 on which the laminated core 3 is placed is carried into the purge section 7, the shutter 13a is closed, and nitrogen gas is injected from a nitrogen gas injection pipe 7a arranged above the purge section 7, and purge is performed. The air in the section 7 is discharged outside through an air discharge pipe 7b arranged below the purge section 7.

  The deoiling furnace 8 is a heat treatment furnace for evaporating oil attached to the base plate constituting the laminated core 3 in the punching step, that is, a heat treatment furnace for performing so-called “oil burning” 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 provided. At the front end of the deoiling furnace 8, a discharge tube 8b for discharging the atmosphere in the deoiling furnace 8 to the outside is provided. At the rear end, a nitrogen gas injection pipe 8c for injecting nitrogen gas into the deoiling furnace 8 is provided. , Respectively. Since the deoiling furnace 8 is configured as described above, the laminated core 3 is heated in a nitrogen gas atmosphere, and the stamping oil attached to the laminated core 3 evaporates into the nitrogen gas. Then, the nitrogen gas containing the vapor of the stamping oil is discharged to the outside through the discharge tube 8b. Note that the deoiling furnace 8 is disposed adjacent to the purge unit 7, and a shutter 13b is disposed between the deoiling furnace 8 and the purge unit 7.

  The annealing furnace 9 is a heat treatment furnace for heating and annealing the laminated core 3. Inside the annealing furnace 9, a heater 9 a for holding the laminated core 3 raised to an annealing temperature (for example, near 800 ° C.) is provided. Further, a nitrogen gas injection pipe 9b for injecting nitrogen gas into the annealing furnace 9 is provided. Note that the annealing furnace 9 is arranged before the oil removing furnace 8, and a shutter 13 c is arranged between the annealing furnace 9 and the oil removing furnace 8.

  The first cooling unit 10 is a section that cools the laminated core 3 that has been annealed to a temperature suitable for starting bluing. The first cooling unit 10 is provided with a nitrogen gas injection pipe 10a and a cooling pipe 10b. The nitrogen gas injection pipe 10a is a pipe for injecting nitrogen gas into the first cooling unit 10. The cooling pipe 10b is a pipe that conducts outside air and cools the atmosphere in the first cooling unit 10. The outside air introduced from one end of the cooling pipe 10 b exchanges heat with the atmosphere in the first cooling unit 10, that is, absorbs heat from the atmosphere in the first cooling unit 10, thereby increasing the temperature. Is discharged from the other end of the cooling pipe 10b. In addition, the first cooling unit 10 is disposed in front of the annealing furnace 9, and a shutter 13 d is disposed between the annealing furnace 9 and the first cooling unit 10.

The bluing furnace 11 is a heat treatment furnace that generates a triiron tetroxide (Fe ₃ O ₄ ) film on the surface of the laminated core 3. Inside the bluing furnace 11, a heater 11a for changing the atmosphere temperature in the furnace according to a time-temperature curve suitable for forming a film, and a gas supply nozzle 11b for blowing an inert gas (nitrogen gas) and water vapor are provided. Have been. Note that the bluing furnace 11 is arranged before the first cooling unit 10, and a shutter 13 e is arranged between the bluing furnace 11 and the first cooling unit 10.

  The second cooling unit 12 is a section that cools the laminated core 3 that has finished bluing to room temperature. The second cooling unit 12 is provided with a nitrogen gas injection pipe 12a and a cooling pipe 12b. The nitrogen gas injection pipe 12 a is a pipe for injecting nitrogen gas into the second cooling unit 12. The cooling pipe 12b is a pipe that conducts cooling water supplied from a water supply unit (not shown) to cool the atmosphere in the second cooling unit 12. The cooling water introduced from one end of the cooling pipe 12b exchanges heat with the atmosphere in the second cooling unit 12, that is, absorbs heat from the atmosphere in the second cooling unit 12, and as a result, the temperature rises. Then, it is discharged from the other end of the cooling pipe 12b. Note that the second cooling unit 12 is disposed at the tip of the brewing furnace 11, and a shutter 13 f is disposed between the second cooling unit 12 and the brewing furnace 11. The unloading section 4 is disposed ahead of the second cooling section 12, and a shutter 13 g is disposed between the second cooling section 12 and the unloading section 4.

  The shutters 13 (13a to 13g) are devices that prevent the atmosphere inside each section (the deoiling furnace 8 to the second cooling section 12) from flowing into another section and from flowing outside. The shutter 13 includes a main body (shielding plate) and an actuator (for example, an air cylinder) (not shown) for raising and lowering the shielding plate. FIG. 1 shows a state in which the shutter 13a disposed at the entrance of the purge unit 7 is in a state in which the shielding plate is raised, that is, a state in which the entrance of the purge unit 7 is open. The shutter 13d disposed between the annealing furnace 9 and the first cooling unit 10 has shown a state where it has risen to an intermediate height. The other shutters 13b to 13c and 13e to 13g 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 treatment apparatus 1 is controlled by a control device 14 including a computer (not shown). The control device 14 controls the transport device 6 by executing a program stored in the computer. The control device 14 executes a program stored in the computer to open and close the shutters 13 (13a to 13g). Then, the control device 14 adjusts the flow rate of the nitrogen gas supplied to the purge unit 7 and each section (the deoiling furnace 8 to the second cooling unit 12). Further, the control device 14 operates the deoiling furnace 8, the annealing furnace 9, and the brewing furnace 11, and adjusts the flow rates of the cooling air and the cooling water supplied to the first cooling unit 10 and the second cooling unit 12.

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 to carry in the carrying jig 5 on which the laminated core 3 is placed into the carrying-in section 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 purge unit 7 to open the entrance of the purge unit 7, and instructs the transport device 6 to cause the laminated iron core 3 to rotate. The loaded transport jig 5 is transferred into the purge unit 7. Thereafter, the controller 14 instructs the shutter 13a to close the entrance of the purge unit 7, and instructs the purge unit 7 to eject nitrogen gas from the nitrogen gas injection pipe 7a. Then, when the atmosphere in the purge section 7 is replaced with nitrogen gas, the control device 14 instructs the shutter 13b arranged at the entrance of the deoiling furnace 8 to open the entrance of the deoiling furnace 8 and , The transfer jig 5 on which the laminated core 3 is placed is transferred into the deoiling furnace 8. Thereafter, the control device 14 instructs the shutter 13b to close the entrance of the deoiling furnace 8, and instructs the deoiling furnace 8 to operate the heater 8a, thereby causing the laminated core 3 placed on the transport jig 5 to operate. The oil adhering to is removed. That is, “oil baking” is performed on the laminated core 3. When the “oil baking” is completed, the control device 14 commands the shutter 13 c and the transfer device 6 arranged at the boundary between the deoiling furnace 8 and the annealing furnace 9 to move the transfer jig 5 on which the laminated core 3 is placed. It is transferred inside the annealing furnace 9. Then, the shutter 13c is instructed to close the entrance of the annealing furnace 9, and the annealing furnace 9 is instructed to operate the heater 9a to perform "annealing" on the laminated core 3. Thereafter, similarly, every time the processing in each section is completed, the transport jig 5 on which the laminated core 3 is mounted is transferred to the next section, and the next processing is performed. When all the processes are completed, the transport jig 5 on which the laminated core 3 is placed is transferred to the unloading section 4.

Now, since the atmosphere temperature inside the purge unit 7 is lower than the atmosphere temperature inside the deoiling furnace 8 during operation, when the shutter 13b is opened and the atmosphere inside the deoiling furnace 8 flows into the purge unit 7, Condensation easily occurs in the purge unit 7. Since the ambient temperature inside the deoiling furnace 8 is lower than the ambient temperature of the annealing furnace 9, when the shutter 13 c is opened and the atmosphere inside the annealing furnace 9 flows into the deoiling furnace 8, dew condensation occurs in the deoiling furnace 8. Easy to occur. Since the atmosphere temperature inside the first cooling unit 10 is lower than the atmosphere inside the annealing furnace 9, when the shutter 13 d is opened and the atmosphere inside the annealing furnace 9 flows into the first cooling unit 10, the first cooling unit In the case of 10, dew condensation easily occurs. Further, since the ambient temperature inside the first cooling unit 10 is lower than the ambient temperature inside the brewing furnace 11, when the shutter 13e is opened and the atmosphere inside the brewing furnace 11 flows into the first cooling unit 10, In addition, dew condensation easily occurs in the first cooling unit 10. Since the ambient temperature inside the second cooling unit 12 is lower than the ambient temperature inside the brewing furnace 11, when the shutter 13 f is opened and the atmosphere inside the brewing furnace 11 flows into the second cooling unit 12, Dew condensation is likely to occur in one cooling unit 10.

  FIG. 2A is a cross-sectional view of the purge unit 7 taken along line A-A ′ in FIG. As shown in FIG. 2A, the ceiling surface of the inner surface of the casing 15 that forms the outer periphery of the purge unit 7 has an inclination such that the central part 15 a is the highest, and the left end 15 b and the right end 15 c are the lowest. I have. In addition, the ceiling surface is formed symmetrically, and the central portion 15a is located exactly halfway between the left end 15b and the right end 15c, and the left end 15b and the right end 15c have the same height. Therefore, the left end 15b and the right end 15c are located lower than all other parts of the ceiling surface. As shown in FIG. 2B, a large number of grooves 15d are formed on the slope from the central portion 15a of the ceiling surface toward the right end 15c along the geodesic line of the slope, that is, in the direction in which the slope is maximized. Is formed. The same applies to the slope from the central portion 15a toward the left end 15b. This ceiling surface is an example of the canopy surface according to the present invention. The formation of the groove 15d is optional. The ceiling surface may be a smooth surface without the groove 15d.

  Since the ceiling surface of the housing 15 is formed in this manner, oil droplets and the like condensed on the ceiling surface flow from the central portion 15a toward the left end 15b and the right end 15c, and further flow downward along the wall surface 15e. . An oil reservoir 16 is provided at the bottom of the housing 15, and oil droplets and the like flowing along the wall surface 15e enter the oil reservoir 16, and then are discharged outside through a drain pipe (not shown).

  The central portion 15a is the highest point of a ramp formed on the ceiling surface of the housing 15, and the left end 15b and the right end 15c correspond to the end of a downward slope extending from the central portion 15a. The left end 15b and the right end 15c, that is, the end of the downward slope extending from the central portion 15a is a section sandwiched by a perpendicular 6d rising from the left end of the slat 6c of the transport device 6 and a perpendicular 6e rising from the right end of the slat 6c. 6f.

  Further, since a large number of grooves 15d are formed in the ceiling surface and the surface area is large as compared with a case where the surface is finished smoothly, oil droplets and the like attached to the ceiling surface are less likely to fall. In addition, since the groove 15d is formed in the direction in which the inclination becomes maximum on the ceiling surface, oil droplets and the like attached to the ceiling surface quickly flow along the groove 15d toward the left end 15b or the right end 15c. Therefore, it is less likely that oil droplets or the like adhering to the ceiling surface fall from the ceiling surface and contaminate the laminated iron core 3 and the like.

  FIG. 3 is a cross-sectional view of the annealing furnace 9 taken along the line B-B 'in FIG. In FIG. 3, the shutter 13d arranged at the boundary between the annealing furnace 9 and the first cooling unit 10 is viewed from the left side in FIG. As shown in FIG. 3, the lower end 17 of the shutter 13d is formed so that the center 17a is the highest and the left end 17b and the right end 17c are the lowest. The lower end 17 is also formed symmetrically, and the central portion 17a is located exactly at the middle between the left end 17b and the right end 17c, and the left end 17b and the right end 17c have the same height. Therefore, the left end 17b and the right end 17c are located lower than all other parts of the lower end 17. Although not shown, a groove similar to the groove 15 d in the housing 15 is also formed in the lower end 17. The lower end 17 is an example of a canopy surface formed at the lower end of the shielding plate.

  Since the shutter 13d is configured as described above, oil droplets and the like generated on the shutter 13d by dew condensation quickly flow from the central portion 17a to the left end 17b and the right end 17c. Therefore, when the laminated core 3 passes under the shutter 13d, it is less likely that oil droplets or the like fall from the lower end 17 and contaminate the laminated core 3.

(Second Embodiment)
In the first embodiment, a sectional shape obtained by cutting the housing 15 or the shutter 13d by a plane perpendicular to the direction in which the stacked core 3 is transported by the transport device 6 is provided on the ceiling surface of the housing 15 or the lower end 17 of the shutter 13d. In the example shown above, the path toward the left end or the right end from the point (1) is shaped so as to form an inclined road whose height decreases as approaching the end in all the sections. That is, although the example in which the ramp is formed on the ceiling surface having the cross-sectional shape of the housing 15 has been described, a new member may be added inside the housing 15 and the ramp may be formed by the new member. . This configuration is particularly useful when the present invention is applied to an existing heat treatment apparatus. Hereinafter, the second embodiment will be described with reference to FIG.

As shown in FIG. 4, inside the housing 15, a roof-shaped member 18 is suspended from the ceiling surface of the housing 15 via suspension columns 19. In addition, the roof-shaped member 18 is disposed in the housing 15 over the entire length of the housing 15 (the left-right direction in FIG. 1) and covers all the laminated cores 3 mounted on the transport jig 5. . The roof-shaped member 18 has such a slope that the central portion 18a is the highest and the left end 18b and the right end 18c are the lowest in the cross-sectional shape as shown in FIG. In addition, the ceiling surface is formed symmetrically, and the central portion 18a is located exactly in the middle between the left end 18b and the right end 18c, and the left end 18b and the right end 18c have the same height. A groove similar to the groove 15d in the housing 15 is also formed on the lower surface of the roof-shaped member 18. The material of the roof-shaped member 18 is not particularly limited, but an appropriate material may be selected from heat-resistant materials that can withstand the ambient temperature of the section where the roof-shaped member 18 is arranged.

  Since the roof-shaped member 18 is configured as described above, oil droplets and the like condensed on the lower surface of the roof-shaped member 18 quickly flow from the central portion 18a to the left end 18b and the right end 18c, and oil from the left end 18b and the right end 18c. It falls into the reservoir 16. For this reason, it is unlikely that oil drops or the like fall on the laminated core 3 and contaminate the laminated core 3.

  Note that the central portion 18a is the highest point of a ramp formed on the lower surface of the roof-shaped member 18, and the left end 18b and the right end 18c correspond to the end of a downward slope extending from the central portion 18a. The left end 18b and the right end 18c, that is, the end of the downward slope extending from the central portion 18a is a section sandwiched between a perpendicular 6d rising from the left end of the slat 6c of the transport device 6 and a perpendicular 6e rising from the right end of the slat 6c. 6f.

(Third embodiment)
In the first and second embodiments, the example in which the member forming the canopy surface is fixedly installed on the heat treatment apparatus 1 has been described. However, the member having the canopy surface may move together with the transport jig 5. With such a configuration, the present invention can be easily and inexpensively applied to the existing heat treatment apparatus 1. Hereinafter, the third embodiment will be described with reference to FIG.

  As shown in FIG. 5, a placing column 20 is attached to the roof-shaped member 18, and the placing column 20 is supported on the lower surface by the transport jig 5. That is, the roof-shaped member 18 is placed on the transfer jig 5 via the placing column 20 and can move in the heat treatment apparatus 1 together with the transfer jig 5. As in the case of the second embodiment, oil droplets and the like condensed on the lower surface of the roof-shaped member 18 quickly flow from the central portion 18a to the left end 18b and the right end 18c, and fall from the left end 18b and the right end 18c. For this reason, it is unlikely that oil drops or the like fall on the laminated core 3 and contaminate the laminated core 3.

  Also in the third embodiment, the central portion 18a is the highest point of a ramp formed on the lower surface of the roof-shaped member 18, and the left end 18b and the right end 18c correspond to the ends of the downward slope extending from the central portion 18a. The left end 18b and the right end 18c, that is, the end of the downward slope extending from the central portion 18a is a section sandwiched between a perpendicular 6d rising from the left end of the slat 6c of the transport device 6 and a perpendicular 6e rising from the right end of the slat 6c. 6f.

  As described above, each embodiment of the present invention has been described, but these exemplify specific embodiments 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 without departing from the technical concept described in the claims.

In each embodiment, an example is shown in which the cross-sectional shape of the canopy surface is formed by a straight line, but the canopy surface is not limited to this. For example, as shown in FIG. 6A, the cross-sectional shape may be a curve. The cross-sectional shape of the canopy surface is not limited to a symmetrical one. For example, in FIG. 2A, the central portion 15a may be closer to the left end 15b or the right end 15c than the middle between the left end 15b and the right end 15c. Alternatively, the heights of the left end 15b and the right end 15c may be different. The cross-sectional shape of the canopy-like member is not limited to the shape in which the central portion 15a is highest. For example, as shown in FIG. 6B, the left end 15b may be the highest and the right end 15c may be the lowest. That is, oil droplets and the like may flow from the left end 15b toward the right end 15c. The same applies to the shape of the lower end 17 of the shutter 13d. in short,
In a cross-sectional shape obtained by cutting the canopy surface according to the present invention by a plane perpendicular to the transport direction of the object to be processed, any point on the canopy surface has one of the left end and the right end of the canopy surface from that point. There is always a downward ramp toward the end of the road, and the ramp may be of any shape as long as it is always downhill and does not turn uphill. In addition, the wall surface 15e of the housing 15 is not limited to a vertical wall. As shown in FIG. 6C, the left and right wall surfaces 15e may fall inward.

  In the first embodiment, an example in which the downward slope extending from the central portion 15a reaches the left end 15b and the right end 15c of the canopy surface reaches the canopy surface, but the downward slope does not have to reach the left end 15b and the right end 15c. . It is sufficient that the downward slope extending from the highest point of the ramp extends to the outside of the section between the perpendicular line rising from the left end of the object and the perpendicular line rising from the right end of the object. For example, as shown in FIGS. 7A and 7B, the central portion 15a is the highest point of the canopy surface, and a downward slope is formed on both left and right sides of the central portion 15a, and the terminal end 15f of the downward slope , 15g may be located outside a section 6f sandwiched between a perpendicular 6d rising from the left end of the slat 6c of the conveying device 6 and a perpendicular 6e rising from the right end of the slat 6c. Alternatively, as shown in FIG. 7C, when the left end 15b is the highest point of the canopy surface, the end 15g of the downward slope going from the left end 15b to the right end 15c rises from the right end of the slat 6c of the transfer device 6. It may be located on the right side of the perpendicular line 6e, that is, outside the section 6f. With such a configuration, water droplets and oil droplets generated on the canopy surface due to dew condensation flow down the slope and flow to the terminal ends 15f and 15g, and fall from the terminal ends 15f and 15g to the oil reservoir 16. Therefore, the laminated iron core 3 is not stained with water drops or oil drops.

  In the first to third embodiments and the above-described modifications, the end of the downward slope is perpendicular to the vertical line 6d rising from the left end of the slat 6c of the transfer device 6 and the vertical line 6e rising from the right end of the slat 6c. Although the example which is located outside the section 6f sandwiched between is illustrated, the end of the downward slope may be slightly inside from the section 6f. For example, in FIG. 7A, the terminal ends 15f and 15g are sandwiched between a perpendicular 3a rising from the left end of the laminated core 3 arranged on the left end and a perpendicular 3b rising from the right end of the laminated core 3 arranged on the right end. If it is outside the section 3c, the downward slope extends to the outside of the section between the perpendicular line rising from the left end of the object and the perpendicular line rising from the right end of the object.

The mounting structure of the roof-shaped member 18 fixed to the housing 15 is not limited to a so-called suspended roof. As shown in FIG. 8A, the roof-shaped member 18 may be supported on the left and right wall surfaces 15e of the housing 15 at the left end 18b and the right end 18c. The cross-sectional shape of the roof member 18 is not limited to a simple “angle”. As shown in FIG. 8 (b), it may be possible to lower from the left end 18b toward the right end 18c. That is, a so-called "one-way" type roof may be used. As shown in FIG. 8 (c), a "ridge-shaped" central roof-shaped member 18d is disposed at the center, and a "single-flow" type side roof-shaped member 18e is provided on both sides thereof, and an end of the central roof-shaped member 18d. The portion and the end of the side roof-shaped member 18e may be arranged so as to partially overlap. That is, the central roof-shaped member 18d may be arranged, and the side roof-shaped members 18e may be arranged on both sides of the central roof-shaped member with a vertical gap therebetween, so that both of them are overlapped in a planar shape. With such a structure, oil droplets and the like flowing along the lower surface of the central roof member 18d fall on the upper surface of the side roof member 18e and flow along the upper surface of the side roof member 18e. In both the central roof-shaped member 18d and the side roof-shaped member 18e, the distance over which oil droplets and the like flow along the lower surface is short, so that the oil droplets and the like are more difficult to fall. Therefore, oil stains on the laminated core 3 can be suppressed more reliably. 8 (b), the roof-shaped member 18 is divided into an upper roof-shaped member 18f and a lower roof-shaped member 18g, as shown in FIG. 8 (d). By arranging them so that they overlap one another at the boundary between them, the same effect can be obtained. The roof-shaped member 18 placed on the transport jig 5 as shown in FIG. 5 can also be deformed according to FIGS. 8B to 8D.

  The groove provided on the canopy surface is not limited to the groove 15d having the corrugated cross section shown in FIG. The groove 15d may have a rectangular cross section as shown in FIG. 9A, or may have a sawtooth cross section as shown in FIG. 9B.

  In each of the above embodiments, the example in which the member forming the canopy surface is arranged inside the purge unit 7 or on the shutter 13d arranged at the entrance of the purge unit 7 has been described. ) Are not limited to these. It may be arranged in another section or inside a heat treatment furnace. Alternatively, the shutter 13 may be provided in another section or a shutter 13 provided at the entrance or exit of the heat treatment furnace. Further, for example, when a tunnel-shaped passage is arranged between the heat treatment furnace and another heat treatment furnace, the passage may be arranged in the passage.

  In each of the above embodiments, nitrogen gas is introduced to make each section a non-oxidizing atmosphere. However, the gas to be introduced into each section may be other inert gas or DX gas. Or a modified gas such as RX gas.

  In each of the above embodiments, as the cooling medium to be conducted to the cooling pipes 10b and 12b, air is illustrated in the cooling pipe 10b of the first cooling unit 10, and water is illustrated in the cooling pipe 12b of the second cooling unit 12, respectively. The cooling medium is not limited to air or water.

  In each of the above-described embodiments, the laminated core is illustrated as the processed object, but the processed object according to the present invention is not limited to the laminated core. INDUSTRIAL APPLICABILITY The present invention can be widely applied to a heat treatment apparatus and a heat treatment method in which a laminated body to be punched and laminated using a stamping oil is an object to be treated.

  In each of the above embodiments, the laminated core is illustrated as an object to be processed, but the object to be treated by the heat treatment apparatus and the heat treatment method according to the present invention is not limited to the laminated core. The object to be treated by the heat treatment apparatus and the heat treatment method according to the present invention is not limited to a laminated body that is punched using a stamping oil and laminated. The heat treatment apparatus and the heat treatment method according to the present invention can be widely applied to heat treatment for products or semi-finished products other than these.

DESCRIPTION OF SYMBOLS 1 Heat treatment apparatus 2 Carry-in part 3 Laminated iron core 3a Perpendicular line 3b Perpendicular line 3c Section 4 Carry-out part 5 Conveyor jig 6 Carrier 6a Driving sprocket wheel 6b Driven sprocket wheel 6c Slat 6d Perpendicular line 6e Perpendicular line 6f Section 7 Nitrogen gas purging pipe 7a Air discharge pipe 8 Deoiling furnace 8a Heater 8b Discharge cylinder 8c Nitrogen gas injection pipe 9 Annealing furnace 9a Heater 9b Nitrogen gas injection pipe 10 First cooling unit 10a Nitrogen gas injection pipe 10b Cooling pipe 11 Brewing furnace 11a Heater 11b Gas supply nozzle 12 Second cooling part 12a Nitrogen gas injection pipe 12b Cooling pipe 12c Discharge cylinder 13 (13a to 13g) Shutter 14 Control device 15 Housing 15a Central part 15b Left end 15c Right end 15d Groove 15e Wall 15f Terminal 15g Terminal 16 Oil reservoir 17 Lower end 17a Central part 17b Left end 17c Right end 18 Roof shaped member 18a Central part 18b Left end 18c Right end 18d Central roof shaped member 18e Side roof shaped member 18f Upper roof shaped member 18g Lower roof shaped member 19 Suspended pillar 20 Pillar

Claims (6)

In the heat treatment apparatus for carrying the object to be processed into the housing and performing heat treatment on the object to be processed,
The transporting means for placing the workpiece, loading and unloading the workpiece into and out of the housing,
Inside the housing, a canopy surface that covers the object to be processed is provided,
In a cross-sectional shape obtained by cutting the heat treatment apparatus on a plane perpendicular to the transport direction of the workpiece, the left and right ends of the transport unit are located outside the left and right edges of the workpiece, and the left and right ends of the transport unit. An oil reservoir is arranged on one or both outsides,
In the cross-sectional shape, a ramp is formed on the canopy surface,
A downward slope extending from the highest point of the ramp extends in the cross-sectional shape directly above the oil reservoir,
A heat treatment apparatus characterized by the above-mentioned. Another housing arranged adjacent to the housing,
A shutter for opening and closing a passage communicating between the housing and the another housing,
A different heat treatment is performed in the housing than in the different housing,
The ambient temperature in the housing is relatively lower than the ambient temperature in the another housing,
The transfer means transfers the object to be processed between the housing and the another housing,
The heat treatment apparatus according to claim 1. The highest point of the ramp is located between the left end and the right end of the canopy surface, and the downward slope is on both sides of the highest point and extends toward the left end and the right end of the canopy surface,
The heat treatment apparatus according to claim 1 or 2, wherein: The highest point of the ramp is at the left end or the right end of the canopy surface, and the downward slope extends from the highest point toward the other end of the canopy surface,
The heat treatment apparatus according to claim 1 or 2, wherein: The canopy surface is a ceiling of the housing,
The heat treatment apparatus according to any one of claims 1 to 4, wherein: The canopy surface is a lower surface of a roof-shaped member arranged inside the housing.
The heat treatment apparatus according to any one of claims 1 to 4, wherein:

Images