JP2021048695A - Iron core product manufacturing method and iron core product manufacturing apparatus - Google Patents

Abstract

To provide an iron core product manufacturing method and an iron core product manufacturing apparatus capable of effectively utilizing heat of an iron core body in a subsequent process.SOLUTION: An example of the iron core product manufacturing method may include: arranging an iron core body provided with a resin injection part in a resin injection device and injecting a molten resin into the resin injection part; cooling the iron core body in a process of conveying the iron core body on a conveyance path extending between the resin injection device and a subsequent processing device; and keeping the iron core body warm when the temperature of the iron core body during conveyance on the conveyance path is lower than a predetermined temperature.SELECTED DRAWING: Figure 6

Description

The present disclosure relates to a method for manufacturing an iron core product and an apparatus for manufacturing an iron core product.

Patent Document 1 discloses a method for manufacturing a rotor core used in an embedded magnet type (IPM: Interior Permanent Magnet) motor. The method includes inserting a permanent magnet into a magnet insertion hole of an iron core body, injecting a molten resin into the magnet insertion hole, and solidifying the molten resin. In the resin injection step, the iron core body is preheated for the purpose of evenly filling the magnet insertion holes with the molten resin.

International Publication No. 2017/159348

The present disclosure describes a method for manufacturing an iron core product and an apparatus for manufacturing an iron core product, which can effectively utilize the heat of the iron core body in a subsequent process.

An example of a method for manufacturing an iron core product is to arrange an iron core body provided with a resin injection part in a resin injection device and inject molten resin into the resin injection part, and between the resin injection device and a subsequent processing device. In the process of transporting the iron core body by the transport path extending to, the core body is cooled, and when the temperature of the core body being transported through the transport path falls below a predetermined temperature, the core body is kept warm. You may be.

An example of an apparatus for manufacturing an iron core product may include a resin injection apparatus configured to inject molten resin into a resin injection portion provided in the iron core body, and a subsequent processing apparatus of the resin injection apparatus. An example of an iron core product manufacturing apparatus may further include a transport path configured to extend between the resin injection device and the processing device, and a cooling unit configured to cool the inside of the transport path. .. Furthermore, an example of an iron core product manufacturing apparatus is configured to measure the temperature of a heat insulating unit configured to keep the iron core body being conveyed in a transport path and the temperature of the iron core body being conveyed in a transport path. It may be provided with a measuring unit. In addition, an example of the iron core product manufacturing apparatus may include a control unit configured to operate the heat retaining unit when the temperature measured by the measuring unit falls below a predetermined temperature.

According to the iron core product manufacturing method and the iron core product manufacturing apparatus according to the present disclosure, it is possible to effectively utilize the heat of the iron core body in a subsequent process.

FIG. 1 is an exploded perspective view showing an example of a rotor. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. FIG. 3 is a schematic view showing an example of a rotor manufacturing apparatus. FIG. 4 is a cross-sectional view schematically showing an example of a resin injection device. FIG. 5 is a cross-sectional view schematically showing an example of a welding apparatus. FIG. 6 is a side view schematically showing an example of the transport device. FIG. 7 is a top view schematically showing the transport device of FIG. FIG. 8 is a side view showing a state in which the covering member covers the transport path in the transport device of FIG.

Hereinafter, an example of the embodiment according to the present disclosure will be described in more detail with reference to the drawings. In the following description, the same reference numerals will be used for the same elements or elements having the same function, and duplicate description will be omitted.

[Rotor configuration]
First, the configuration of the rotor 1 (iron core product) will be described with reference to FIGS. 1 and 2. The rotor 1 (rotor) constitutes an electric motor (motor) by being combined with a stator (stator). The rotor 1 may form, for example, an embedded magnet type (IPM) motor, or may form part of another type of motor. The rotor 1 includes a rotor laminated iron core 2, a pair of end face plates 3 and 4, and a shaft 5.

The rotor laminated iron core 2 includes a laminated body 10 (iron core main body), a plurality of permanent magnets 12, and a plurality of solidified resins 14.

As shown in FIG. 1, the laminated body 10 has a cylindrical shape. A shaft hole 10a penetrating the laminated body 10 is provided in the central portion of the laminated body 10 so as to extend along the central axis Ax. The shaft hole 10a extends in the height direction (vertical direction) of the laminated body 10. Since the laminate 10 rotates around the central axis Ax, the central axis Ax is also a rotation axis.

A pair of ridges 10b are formed on the inner peripheral surface of the shaft hole 10a. The ridges 10b extend in the height direction from the upper end surface S1 of the laminated body 10 to the lower end surface S2. The pair of ridges 10b face each other with the central axis Ax in between, and project from the inner peripheral surface of the shaft hole 10a toward the central axis Ax.

A plurality of magnet insertion holes 16 (resin injection portions) are formed in the laminated body 10. As shown in FIG. 1, the magnet insertion holes 16 are arranged at predetermined intervals along the outer peripheral edge of the laminated body 10. As shown in FIG. 2, the magnet insertion hole 16 penetrates the laminate 10 so as to extend along the central axis Ax. That is, the magnet insertion hole 16 extends in the height direction.

The laminated body 10 is configured by stacking a plurality of punching members W. The punched member W is a plate-like body in which a metal plate MS (for example, an electromagnetic steel plate) described later is punched into a predetermined shape, and has a shape corresponding to the laminated body 10. The laminated body 10 may be composed of so-called transproduct. "Transposition" means stacking a plurality of punching members W while relatively shifting the angles of the punching members W. The rolling product is mainly carried out for the purpose of canceling the plate thickness deviation of the punched member W and increasing the flatness, parallelism and squareness of the laminated body 10. The rolling product angle may be set to any size.

The punching members W adjacent to each other in the stacking direction may be fastened by the caulking portion 18 as shown in FIGS. 1 and 2. These punching members W may be fastened to each other by various known methods instead of the caulking portion 18. For example, the plurality of punched members W may be joined to each other by using an adhesive or a resin material, or may be joined to each other by welding. Alternatively, the temporary caulking may be provided on the punching member W, and a plurality of punching members W may be fastened via the temporary caulking to obtain the laminated body 10, and then the temporary caulking may be removed from the laminated body. The "temporary caulking" means caulking that is used to temporarily integrate a plurality of punched members W and is removed in the process of manufacturing the rotor laminated iron core 2.

As shown in FIGS. 1 and 2, one permanent magnet 12 is inserted into each magnet insertion hole 16. The shape of the permanent magnet 12 is not particularly limited, but may have a rectangular parallelepiped shape, for example. The type of the permanent magnet 12 may be determined according to the application of the motor, the required performance, and the like. For example, it may be a sintered magnet or a bonded magnet.

The solidified resin 14 is a solidified resin material (molten resin) in a molten state filled in the magnet insertion hole 16 accommodating the permanent magnet 12. The solidified resin 14 may be configured to fix the permanent magnet 12 in the magnet insertion hole 16. The solidified resin 14 may be configured to join the punching members W adjacent to each other in the height direction.

The end face plates 3 and 4 have an annular shape as shown in FIG. That is, shaft holes 3a and 4a penetrating the end face plates 3 and 4 are provided at the central portions of the end face plates 3 and 4, respectively. The outer diameters of the end face plates 3 and 4 may be set smaller than the outer diameter of the laminated body 10, or may be set to be about the same as the outer diameter of the laminated body 10.

A pair of protrusions 3b are formed on the inner peripheral surface of the shaft hole 3a. The pair of protrusions 3b face each other with the central axis Ax in between, and project from the inner peripheral surface of the shaft hole 3a toward the central axis Ax. Similar to the shaft hole 3a, a pair of protrusions 4b are formed on the inner peripheral surface of the shaft hole 4a. When viewed from above (in the direction of the central axis), the sizes and shapes of the protrusions 3b and 4b may be substantially the same as the size and shape of the ridges 10b.

The end face plates 3 and 4 are arranged on the upper end surface S1 and the lower end surface S2 of the laminated body 10, respectively, and are joined to the laminated body 10 by welding. For example, as shown in FIG. 2, one or more end face plates 3 are located near the upper end of the laminate 10 via a weld bead B1 provided so as to straddle the end plate 3 and the laminate 10. It is joined to the punching member W of. Similarly, the end face plate 4 is joined to one or more punching members W located near the lower end of the laminate 10 by a weld bead B2 provided so as to straddle the end face plate 4 and the laminate 10. There is. In this way, the rotor laminated iron core 2 and the end face plates 3 and 4 are integrated by welding, so that one rotating body 6 is formed.

The shaft 5 has a columnar shape as a whole. A pair of concave grooves 5a are formed on the shaft 5. The concave groove 5a extends in the extending direction of the shaft 5 from one end to the other end of the shaft 5. The shaft 5 is inserted into the shaft holes 3a, 4a, 10a. At this time, the protrusions 3b and 4b and the ridges 10b are engaged with the concave groove 5a. As a result, the rotational force is transmitted between the shaft 5 and the rotor laminated iron core 2.

[Rotor manufacturing equipment]
Subsequently, the manufacturing apparatus 100 for the rotor 1 will be described with reference to FIGS. 3 to 5. The manufacturing apparatus 100 is configured to manufacture the rotor 1 from the strip-shaped metal plate MS. As shown in FIG. 3, the manufacturing apparatus 100 includes an uncoiler 110, a delivery apparatus 120, a press processing apparatus 130, a resin injection apparatus 140, a welding apparatus 150 (subsequent processing apparatus), and a shaft mounting apparatus 160 ( A subsequent processing device), transfer devices 200A to 200C, and a controller Ctr (control unit) are provided.

The uncoiler 110 is configured to rotatably hold the coil material 111. The coil material 111 is a metal plate MS wound in a coil shape (spiral shape). The delivery device 120 includes a pair of rollers 121 and 122 that sandwich the metal plate MS from above and below. The pair of rollers 121 and 122 rotate and stop based on the instruction signal from the controller Ctr, and intermittently and sequentially feed the metal plate MS toward the press working apparatus 130.

The press working apparatus 130 operates based on an instruction signal from the controller Ctr. The press processing device 130 is configured to sequentially punch out the metal plate MS intermittently sent out by the delivery device 120 to form the punching member W. The press working apparatus 130 is configured to form a laminated body 10 by sequentially laminating a plurality of punching members W obtained by punching.

The resin injection device 140 operates based on an instruction signal from the controller Ctr. The resin injection device 140 is configured to arrange permanent magnets 12 in each magnet insertion hole 16. The resin injection device 140 is configured to fill the molten resin into the magnet insertion hole 16 that accommodates the permanent magnet 12. The resin injection device 140 includes a lower die 141, an upper die 142, and a plurality of plungers 143, as shown in detail in FIG.

The lower mold 141 includes a base member 141a and an insertion post 141b provided on the base member 141a. The base member 141a is configured so that the laminated body 10 can be placed on it. The insertion post 141b is located at a substantially central portion of the base member 141a and projects upward from the upper surface of the base member 141a. The insertion post 141b has a cylindrical shape and has an outer shape corresponding to the shaft hole 10a of the laminated body 10. A heat source similar to the heat source 142b described later may be arranged inside the lower mold 141.

The upper die 142 is configured to be able to hold the laminated body 10 together with the lower die 141 in the height direction. The upper die 142 includes a base member 142a and a heat source 142b.

The base member 142a is a plate-shaped member having a rectangular shape. The base member 142a is provided with one through hole 142c and a plurality of accommodating holes 142d. The through hole 142c is located at a substantially central portion of the base member 142a. The through hole 142c has a shape (substantially circular shape) corresponding to the insertion post 141b, and the insertion post 141b can be inserted.

The plurality of accommodating holes 142d penetrate the base member 142a and are arranged at predetermined intervals along the periphery of the through holes 142c. Each accommodating hole 142d is located at a position corresponding to the magnet insertion hole 16 of the laminated body 10 when the lower die 141 and the upper die 142 sandwich the laminated body 10. Each accommodating hole 142d has a cylindrical shape and can accommodate at least one resin pellet P.

The heat source 142b is, for example, a heater built in the base member 142a. When the heat source 142b operates, the base member 142a is heated, the laminate 10 in contact with the base member 142a is heated, and the resin pellets P accommodated in each accommodating hole 142d are heated. As a result, the resin pellet P is melted and changed into a molten resin.

The plurality of plungers 143 are located above the upper die 142. Each plunger 143 is configured so that it can be inserted into and removed from the corresponding accommodating hole 142d by a drive source (not shown).

The welding device 150 operates based on an instruction signal from the controller Ctr. The welding device 150 is configured to weld the rotor laminated iron core 2 and the end face plates 3 and 4. The welding apparatus 150 includes protective plates 151 and 152 and welding torches 153 and 154, as shown in FIG.

The protective plates 151 and 152 have a disk shape. The outer diameters of the protective plates 151 and 152 may be set larger than the outer diameters of the end face plates 3 and 4 and the laminated body 10, or may be set to be about the same as the outer diameters of the end face plates 3 and 4 and the laminated body 10. It may have been done.

The protective plate 151 is arranged above the rotor laminated iron core 2 and the end face plate 3. The protective plate 152 is arranged below the rotor laminated iron core 2 and the end face plate 4. The protective plates 151 and 152 are configured so that the rotor laminated iron core 2 and the end face plates 3 and 4 can be sandwiched.

Heat sources 151a and 152a are built in the protective plates 151 and 152, respectively. The heat sources 151a and 152a are configured to heat the end face plates 3 and 4 in a state where the protective plates 151 and 152 are in contact with the end face plates 3 and 4, respectively. The heat sources 151a and 152a may be, for example, heaters.

The welding torches 153 and 154 are configured to weld the end face plates 3 and 4 and the rotor laminated iron core 2 (laminated body 10), respectively. The welding torches 153 and 154 may be, for example, a laser welder. The welding torch 153 is arranged so that the tip portion thereof faces the peripheral edge portion of the end face plate 3 and the rotor laminated iron core 2 (laminated body 10) exposed from the protective plate 151. The welding torch 154 is arranged so that the tip portion thereof faces the peripheral edge portion of the end face plate 4 and the rotor laminated iron core 2 (laminated body 10) exposed from the protective plate 152.

The shaft mounting device 160 operates based on an instruction signal from the controller Ctr. The shaft mounting device 160 is configured to mount the shaft 5 to a rotating body 6 in which a rotor laminated iron core 2 and end face plates 3 and 4 are integrated by welding. For example, the shaft mounting device 160 may be configured to shrink fit the shaft 5 into the shaft holes 3a, 4a, 10a while heating the rotor laminated iron core 2 and the end face plates 3 and 4.

As shown in FIG. 3, the transfer device 200A is arranged so as to extend between the press working device 130 and the resin injection device 140. The transport device 200A operates based on an instruction from the controller Ctr, and is configured to transport the laminate 10 discharged from the press working device 130 to the resin injection device 140. The transport device 200A may include various conveyors (for example, a roller conveyor, a belt conveyor, etc.).

The transport device 200B is arranged so as to extend between the resin injection device 140 and the welding device 150. The transport device 200B operates based on an instruction from the controller Ctr, and is configured to transport the rotor laminated iron core 2 discharged from the resin injection device 140 to the welding device 150. Details of the transport device 200B will be described later.

The transport device 200C is arranged so as to extend between the welding device 150 and the shaft mounting device 160. The transport device 200C operates based on an instruction from the controller Ctr, and is configured to transport the rotating body 6 discharged from the welding device 150 to the shaft mounting device 160. The configuration of the transfer device 200C may be the same as that of the transfer device 200B.

The controller Ctr is, for example, a delivery device 120, a press working device 130, a resin injection device 140, a welding device 150, and a transfer device based on a program recorded on a recording medium (not shown) or an operation input from an operator. It is configured to generate an instruction signal for operating each of the 200A to 200C. The controller Ctr is configured to transmit the instruction signal to each of these devices.

[Details of transport device 200B]
Subsequently, the details of the transfer device 200B will be described with reference to FIGS. 6 to 8. As shown in FIGS. 6 and 7, the transport device 200B includes a transport path 202, a conveyor 204, a cooler 206 (cooling unit), a temperature sensor 208 (measuring unit), and a heat insulating device 210 (heat insulating unit). And the dispensing device 212 (discharging section) and the heating device 214 (heating section).

The transport path 202 extends so as to connect the outlet of the resin injection device 140 and the inlet of the welding device 150. The transport path 202 may be, for example, a square columnar space surrounded by a bottom wall, a pair of side walls, and a top wall. The side wall may have a mesh shape so that air can flow. The portion of the top wall on which the cooler 206 is arranged may also have a mesh shape so that air can flow.

The conveyor 204 is installed on the bottom wall of the transport path 202. The conveyor 204 operates based on an instruction from the controller Ctr, and is configured to convey the mounted rotor laminated iron core 2 from the resin injection device 140 to the welding device 150. The conveyor 204 may be various conveyors (for example, a roller conveyor, a belt conveyor, etc.).

The cooler 206 operates based on an instruction from the controller Ctr, and is configured to cool the rotor laminated iron core 2 conveyed by the conveyor 204. The cooler 206 may be a blower that blows ambient air onto the rotor laminated iron core 2, or may be a cold air blower that blows cold air onto the rotor laminated iron core 2.

The cooler 206 is installed in the transport path 202. The location where the cooler 206 is installed may be a top wall portion of the transport path 202, or may be another portion (for example, a bottom wall, a side wall, etc.). The number of the coolers 206 installed in the transport path 202 may be one or a plurality. The plurality of coolers 206 may be arranged so as to be arranged at predetermined intervals in the longitudinal direction of the transport path 202. The number of coolers 206, the amount of air blown, the air blown temperature, and the like may be set so that the temperature of the rotor laminated iron core 2 reaching the welding device 150 does not fall below a predetermined temperature (first threshold value).

The temperature sensor 208 is configured to measure the temperature of the rotor laminated iron core 2 conveyed by the conveyor 204 and transmit the measured temperature data to the controller Ctr. The temperature sensor 208 may be a contact type sensor or a non-contact type sensor.

The temperature sensor 208 is installed in the transport path 202. The location where the temperature sensor 208 is installed may be on the downstream side of the transport path 202, or may be at another position (for example, the upstream side, the center, etc.). The number of temperature sensors 208 installed in the transport path 202 may be one or a plurality. The plurality of temperature sensors 208 may be arranged so as to be arranged at predetermined intervals in the longitudinal direction of the transport path 202.

The heat retaining device 210 is configured to keep the temperature of the rotor laminated iron core 2 being conveyed through the transport path 202. The heat retaining device 210 includes a covering member 216 and a drive mechanism 218.

The covering member 216 is configured to cover at least a part of the transport path 202. The covering member 216 may be installed on the side of the transport path 202 as shown in FIGS. 6 to 8 or at another position (for example, above or below the transport path 202). Good. The covering member 216 may be installed at least on the upstream side of the transport path 202 in the longitudinal direction of the transport path 202.

The covering member 216 may be a plate-like body having no openings or the like. A heat insulating material may be provided on the portion of the covering member 216 facing the transport path 202. The number of covering members 216 installed in the transport path 202 may be one or a plurality. The plurality of covering members 216 may be arranged so as to be arranged at predetermined intervals in the longitudinal direction of the transport path 202, or may be arranged so as to be adjacent to each other without a gap.

The drive mechanism 218 operates based on the instruction from the controller Ctr, and the covering position where the covering member 216 covers the transport path 202 (see FIG. 8) and the retracting position where the covering member 216 does not overlap with the transport path 202 (FIG. 6). The covering member 216 can be driven with and from (see). When the covering member 216 is in the covering position, the transport path 202 is at least partially covered by the covering member 216, so that the air in the transport path 202 is less likely to flow. Therefore, the temperature drop in the transport path 202 is suppressed. On the other hand, when the covering member 216 is in the retracted position, air can freely flow inside and outside the transport path 202. Therefore, the temperature drop in the transport path 202 is promoted.

When the covering member 216 is arranged on the side of the transport path 202, the drive mechanism 218 may drive the covering member 216 between the covering position and the retracting position by raising and lowering the covering member 216. When the heat insulating device 210 includes a plurality of covering members 216, a drive mechanism 218 may be connected to each covering member 216, or one drive mechanism 218 may drive two or more covering members 216. ..

As shown in FIG. 7, the payout device 212 operates based on the instruction from the controller Ctr, and is configured to push the rotor laminated iron core 2 conveyed by the conveyor 204 from the transfer path 202 to the heating device 214. ing. The payout device 212 may be, for example, a hydraulic actuator, a pneumatic actuator, an electric actuator, an electromagnetic solenoid, or the like.

The heating device 214 is configured to heat the rotor laminated iron core 2 extruded from the transport path 202 by the payout device 212. The heating device 214 is used to reheat the rotor laminated iron core 2 whose temperature has dropped excessively to a temperature suitable for processing in a subsequent device (welding device 150 or shaft mounting device 160). May be good.

[Rotor manufacturing method]
Subsequently, a method for manufacturing the rotor 1 will be described with reference to FIGS. 3 to 8. First, as shown in FIG. 3, a plurality of punching members W are laminated while sequentially punching the metal plate MS by the press working apparatus 130 to form the laminated body 10. The laminate 10 discharged from the press working apparatus 130 is conveyed to the resin injection apparatus 140 by the conveying apparatus 200A.

Next, as shown in FIG. 4, the laminated body 10 is placed on the lower mold 141. Next, the permanent magnet 12 is inserted into each magnet insertion hole 16. The permanent magnet 12 may be manually inserted into each magnet insertion hole 16, or may be manually inserted by a robot hand (not shown) or the like provided in the resin injection device 140 based on the instruction of the controller Ctr. May be good.

Next, the upper mold 142 is placed on the laminated body 10. Therefore, the laminated body 10 is sandwiched between the lower mold 141 and the upper mold 142 from the stacking direction. Next, the resin pellet P is put into each accommodation hole 142d. When the resin pellet P is in a molten state by the heat source 142b of the upper mold 142, the molten resin is injected into each magnet insertion hole 16 by the plunger 143. After that, when the molten resin is solidified, the solidified resin 14 is formed in the magnet insertion hole 16. When the lower mold 141 and the upper mold 142 are removed from the laminated body 10, the rotor laminated iron core 2 is completed.

The controller Ctr instructs the conveyor 204 to convey the laminate 10 discharged from the resin injection device 140 toward the welding device 150. The controller Ctr instructs the cooler 206 to blow air toward the rotor laminated iron core 2 conveyed by the conveyor 204. As a result, the rotor laminated iron core 2 is cooled to such an extent that the temperature of the rotor laminated iron core 2 carried into the welding apparatus 150 becomes a temperature suitable for welding.

At this time, the controller Ctr compares the temperature data of the rotor laminated iron core 2 transmitted from the temperature sensor 208 with a predetermined temperature (first threshold value), and whether the temperature data is lower than the predetermined temperature. Judge whether or not. When the controller Ctr determines that the temperature data does not fall below a predetermined temperature (first threshold value), the controller Ctr continues the transfer of the rotor laminated iron core 2 to the welding device 150 by the conveyor 204.

On the other hand, when the controller Ctr determines that the temperature data is below a predetermined temperature (first threshold value), the controller Ctr instructs the cooler 206 to stop the operation of the cooler 206 and the heat retaining device 210. To move the covering member 216 to the covering position by the drive mechanism 218. As a result, the blowing of air toward the rotor laminated iron core 2 is stopped, and the flow of air in the transport path 202 is suppressed. Therefore, the heat possessed by the rotor laminated iron core 2 is less likely to escape from the inside of the transport path 202, so that the rotor laminated iron core 2 can be kept warm.

When the temperature data is lower than the predetermined lower limit value set lower than the predetermined temperature (first threshold value), the temperature of the rotor laminated iron core 2 is excessively low. Therefore, even if the rotor laminated iron core 2 is kept warm by the heat retaining device 210, there is a concern that the welding quality may be affected. Therefore, the controller Ctr may determine whether or not the temperature data is below a predetermined lower limit value.

When the controller Ctr determines that the temperature data is below a predetermined lower limit value, the controller Ctr instructs the payout device 212 to transport the rotor laminated iron core 2 from the transport path 202 to the heating device 214, and at the same time, the heating device. The rotor laminated iron core 2 may be reheated by instructing 214. After that, when the rotor laminated iron core 2 is reheated in the heating device 214 to the extent that the temperature of the rotor laminated iron core 2 becomes a temperature suitable for welding, the controller Ctr instructs a transport device (not shown) or the like. , The rotor laminated iron core 2 may be conveyed from the heating device 214 to the welding device 150.

Next, as shown in FIG. 5, the end face plates 3 and 4 are arranged on the upper end surface S1 and the lower end surface S2 of the rotor laminated iron core 2 conveyed to the welding apparatus 150, respectively. In this state, the protective plates 151 and 152 heated to a predetermined temperature by the heat sources 151a and 152a sandwich the rotor laminated iron core 2 and the end face plates 3 and 4. As a result, the end face plates 3 and 4 are heated to a temperature suitable for welding. On the other hand, the temperature of the rotor laminated iron core 2 is maintained above a predetermined temperature suitable for welding by the heat retaining device 210.

Next, the controller Ctr instructs the welding torches 153 and 154 to weld the end face plates 3 and 4 and the rotor laminated iron core 2 (laminated body 10). As a result, the rotating body 6 in which the end face plates 3 and 4 are joined to the rotor laminated iron core 2 is formed. The rotating body 6 discharged from the welding device 150 is transported toward the shaft mounting device 160 by the transport device 200C. The controller Ctr may control the transport device 200C in the same manner as the transport device 200B described above.

Next, the shaft attachment device 160 attaches the shaft 5 to the rotating body 6. The shaft 5 may be shrink-fitted to the rotating body 6, for example. In this way, the rotor 1 is completed.

[Action]
According to the above example, when the production of the rotor 1 is continued, the rotor laminated iron core 2 is formed between the resin injection device 140 and the subsequent welding device 150 or the shaft mounting device 160. It is appropriately cooled until it reaches a temperature suitable for welding or mounting the shaft 5. On the other hand, when the production of the rotor 1 is interrupted, the cooling of the rotor laminated iron core 2 is stopped, and the rotor laminated iron core 2 is further kept warm. Therefore, when the production of the rotor 1 is restarted, it is extremely suppressed that the rotor laminated iron core 2 is excessively cooled. Therefore, the heat of the rotor laminated iron core 2 can be effectively used in the subsequent process.

In the above example, the rotor laminated iron core 2 can be kept warm by the heat retaining device 210 while at least the upstream side of the transport path 202 is being transported. In this case, it is possible to prevent the temperature of the rotor laminated iron core 2 immediately after being discharged from the resin injection device 140 from dropping sharply. Therefore, it is possible to easily control the temperature of the rotor laminated iron core 2.

In the above example, the transport path 202 is at least partially covered by the covering member 216, so that the rotor laminated iron core 2 can be kept warm. In this case, the heat retention of the rotor laminated iron core 2 can be easily and easily performed.

In the above example, the controller Ctr uses the temperature data from the temperature sensor 208 arranged on the downstream side of the transport path 202 to determine the temperature of the rotor laminated iron core 2 being transported on the downstream side of the transport path 202. When the temperature falls below the temperature, the heat retaining device 210 can be driven. In this case, the start of heat retention is determined based on the temperature of the rotor laminated iron core 2 located on the downstream side and where the temperature is decreasing. Therefore, it is possible to more accurately determine the start of heat retention.

In the above example, the controller Ctr uses the temperature data from the temperature sensor 208 to stop and keep the cooler 206 warm when the temperature of the rotor laminated iron core 2 being transported through the transport path 202 falls below a predetermined temperature. The device 210 can be driven. In this case, it is extremely suppressed that the rotor laminated iron core 2 is excessively cooled at the start of production of the rotor laminated iron core 2. Therefore, the heat of the rotor laminated iron core 2 can be used more effectively in the subsequent process.

In the above example, when the temperature of the rotor laminated iron core 2 being conveyed downstream of the transport path 202 is lower than a predetermined lower limit value, the controller Ctr uses the payout device 212 to heat the rotor laminated iron core 2 to the heating device 214. While extruding, the rotor laminated iron core 2 can be reheated by the heating device 214. In this case, the rotor laminated iron core 2 that has been excessively cooled during the transfer of the transfer path 202 is not sent to the subsequent welding device 150 or the shaft mounting device 160, but is reheated. Therefore, since only the rotor laminated iron core 2 that does not require reheating is conveyed to the welding device 150 or the shaft mounting device 160, the production time of the rotor 1 can be shortened. Further, since the rotor laminated iron core 2 that requires reheating is processed by the welding device 150 or the shaft mounting device 160 after reheating, the rotor laminated iron core 2 can be used without waste. As a result, the productivity of the rotor 1 can be increased.

[Modification example]
The disclosure herein should be considered exemplary in all respects and not restrictive. Various omissions, substitutions, changes, etc. may be made to the above examples within the scope of the claims and the gist thereof.

(1) When the temperature of the rotor laminated iron core 2 is lower than a predetermined temperature (first threshold value), the covering member 216 may be manually attached to and detached from the transport path 202.

(2) The controller Ctr detects the transport speed of the rotor laminated iron core 2 by the conveyor 204, compares the speed data with a predetermined speed (second threshold value), and the speed data is the predetermined speed. It may be judged whether or not it is less than. When the controller Ctr determines that the speed data is below a predetermined speed (second threshold value), the controller Ctr instructs the cooler 206 to stop the operation of the cooler 206 and also instructs the heat insulating device 210. Then, the covering member 216 may be moved to the covering position by the drive mechanism 218. In this case, even if the transport speed of the rotor laminated iron core 2 in the transport path 202 becomes relatively slow, the cooling of the rotor laminated iron core 2 is stopped, and the rotor laminated iron core 2 is kept warm, so that the rotation occurs. It is suppressed that the child laminated iron core 2 is excessively cooled. Therefore, the heat of the rotor laminated iron core 2 can be used more effectively in the subsequent process.

(3) When the device 100 is stopped, that is, when the transport speed of the rotor laminated iron core 2 becomes 0, the controller Ctr instructs the heat retaining device 210 regardless of the temperature data from the temperature sensor 208 to drive the drive mechanism. The covering member 216 may be moved to the covering position by 218.

(4) The controller Ctr may control the drive mechanism 218 so as to increase or decrease the covering area of the transport path 202 by the covering member 216 according to the temperature, transport speed, outside air temperature, etc. of the rotor laminated iron core 2. ..

(5) When the controller Ctr determines that the temperature data from the temperature sensor 208 is below a predetermined temperature (first threshold value), the controller Ctr instructs the heat insulating device 210 without stopping the operation of the cooler 206. Then, the covering member 216 may be moved to the covering position by the drive mechanism 218. In this case, since the transport path 202 is covered with the covering member 216, it is difficult for the air blown from the cooler 206 to be discharged to the outside of the transport path 202 even if the cooler 206 is operating. Therefore, the cooling capacity of the rotor laminated iron core 2 by the cooler 206 is weakened, so that the rotor laminated iron core 2 can be kept warm. When the device 100 includes a plurality of chillers 206, a part of the chillers 206 of the plurality of chillers 206 may be operated and the rest may be stopped.

(6) Keeping the rotor laminated iron core 2 warm may include heating the rotor laminated iron core 2 by a heating device (heater, hot air blower, etc.) installed in the transport path 202.

(7) After the shaft 5 is attached to the laminated body 10, the permanent magnet 12 may be resin-sealed in the magnet insertion hole 16. Alternatively, after the shaft 5 is attached to the rotor laminated iron core 2, the end face plates 3 and 4 may be welded to the rotor laminated iron core 2.

(8) During the welding process, the outer peripheral surfaces of the laminated body 10 may be welded at a plurality of locations in the laminating direction while moving the welding torches 153 and 154 in the vertical direction.

(9) The welding device 150 may include one welding tote. In this case, for example, the welding torch may first weld the end face plate 3 and the laminate 10 and then move (descend) in the height direction to weld the end face plate 4 and the laminate 10. Good. Alternatively, in this case, for example, the end face plate 3 and the laminate 10 are first welded, then the rotor laminated iron core 2 is inverted together with the joined end face plate 3 and set in the welding device 150 again, and the end face plate 4 and the laminate 10 are set again. 10 may be welded.

(10) An end face plate may be arranged on at least one end face of the laminated body 10. Alternatively, the rotor 1 may not include an end face plate. In this case, for example, welding may be performed on the laminated body 10 so as to join a plurality of punched members W. Specifically, a weld bead extending in the height direction from the upper end to the lower end of the laminated body 10 may be formed on the peripheral surface of the laminated body 10 so as to join all the punched members W. Alternatively, a weld bead may be formed on the peripheral surface of the laminated body 10 so as to join several punching members W at the upper end portion and / or the lower end portion of the laminated body 10. In these cases, it is possible to prevent the punching member W at the upper end portion and / or the lower end portion from being turned over. In the latter case, in particular, since the welding bead is formed at the upper end portion and / or a part of the lower end portion, it is possible to suppress the deterioration of the magnetic characteristics of the rotor 1 due to welding.

(11) A plurality of permanent magnets 12 may be inserted into one magnet insertion hole 16. In this case, the plurality of permanent magnets 12 may be arranged so as to be adjacent to each other along the height direction in one magnet insertion hole 16, or in a direction intersecting the height direction in one magnet insertion hole 16. It may be lined up along.

(12) The iron core body may be composed of other than the laminated body 10. For example, the iron core body may be, for example, one in which the ferromagnetic powder is compression-molded, or one in which a resin material containing the ferromagnetic powder is injection-molded.

(13) The present technology may be applied to an iron core product other than the rotor 1 (for example, a stator laminated iron core). Specifically, even if this technology is applied when a resin film for insulating between the stator laminated iron core and the winding is provided on the inner peripheral surface (resin column insertion part) of the slot of the stator laminated iron core. Good. The stator laminated iron core may be a split type stator laminated iron core formed by combining a plurality of core pieces, or may be a non-divided type stator laminated iron core. In these laminated iron cores, this technique may be applied when a plurality of punched members are joined by filling the through holes (resin column insertion portions) penetrating in the height direction with molten resin.

[Other examples]
Example 1. As an example of the manufacturing method of the iron core product (2), the iron core main body (10) provided with the resin injection part (16) is arranged in the resin injection device (140), and the molten resin is injected into the resin injection part (16). In the process of transporting the iron core body (10) by the transport path (200B) extending between the resin injection device (140) and the subsequent processing device (150, 160), the iron core body (10) is cooled. This may include keeping the iron core body (10) warm when the temperature of the iron core body (10) being conveyed through the transport path (202) falls below a predetermined temperature. When the production of the iron core product is continued, the iron core body is appropriately cooled from the resin injection device to the subsequent processing device until the temperature becomes suitable for processing in the processing device. On the other hand, when the production of the iron core product is interrupted, the iron core body is kept warm. Therefore, when the production of the iron core product is resumed, it is possible to prevent the iron core body from being excessively cooled. Therefore, the heat of the iron core body can be effectively used in the subsequent process.

Example 2. In the method of Example 1, keeping the iron core body (10) warm means that the temperature of the iron core body (10) being transported through the transport path (202) falls below a predetermined temperature, and the core body (202) in the transport path (202) is kept warm. It may include keeping the iron core body (10) warm when the transport speed of 10) is lower than a predetermined speed. In this case, even if the transport speed of the iron core body in the transport path is relatively slow, the iron core body is kept warm, so that the iron core body is prevented from being excessively cooled. Therefore, the heat of the iron core body can be used more effectively in the subsequent process.

Example 3. In the method of Example 1 or Example 2, keeping the iron core body (10) warm may include at least keeping the iron core body (10) being transported upstream of the transport path (202) warm. In this case, it is possible to prevent the temperature of the iron core body from dropping sharply immediately after being discharged from the resin injection device. Therefore, it is possible to easily control the temperature of the iron core body.

Example 4. In any of the methods of Examples 1 to 3, keeping the iron core body (10) warm may include at least partially covering the transport path (201) with a covering member (216). In this case, it is possible to easily and easily keep the iron core body warm.

Example 5. In any of the methods of Examples 1 to 4, keeping the iron core body (10) warm is when the temperature of the iron core body (10) being transported downstream of the transport path (202) falls below a predetermined temperature. , It may include keeping the iron core body (10) warm. In this case, the start of heat retention is determined based on the temperature of the iron core body located on the downstream side and where the temperature is decreasing. Therefore, it is possible to more accurately determine the start of heat retention.

Example 6. In any of the methods of Examples 1 to 5, keeping the iron core body (10) warm means that when the temperature of the iron core body (10) being transported through the transport path (202) falls below a predetermined temperature, the iron core body (10) is kept warm. It may include keeping the iron core body (10) warm while stopping the cooling of (10). In this case, when the production of the iron core product is interrupted, the cooling of the iron core main body is stopped, and the iron core main body is further kept warm. Therefore, when the production of the iron core product is resumed, it is extremely suppressed that the iron core body is excessively cooled. Therefore, the heat of the iron core body can be used more effectively in the subsequent process.

Example 7. In any of the methods of Examples 1 to 6, when the temperature of the iron core body (10) being transported through the transport path (202) is lower than a predetermined lower limit value, the iron core body (10) is transferred to the transport path (202). It may further include removing from and reheating. In this case, the iron core body that has been excessively cooled during transportation in the transport path is not sent to the subsequent processing apparatus, but is reheated. Therefore, since only the iron core main body that does not require reheating is conveyed to the processing apparatus, the production time of the iron core product can be shortened. Further, since the iron core main body that requires reheating is processed in the processing apparatus after reheating, the iron core main body can be used without waste. As a result, it becomes possible to increase the productivity of iron core products.

Example 8. An example of the manufacturing apparatus (100) of the iron core product (1) is a resin injection apparatus (140) configured to inject molten resin into a resin injection portion (16) provided in the iron core main body (10), and a resin. It may be provided with a processing device (150, 160) following the injection device (140). An example of the manufacturing apparatus (100) of the iron core product (1) is a transport path (202) configured to extend between the resin injection device (140) and the processing device (150, 160), and a transport path (202). ) May be further provided with a cooling unit (206) configured to cool the inside. Furthermore, an example of the manufacturing apparatus (100) of the iron core product (1) includes a heat insulating portion (210) configured to keep the iron core main body (10) being transported through the transport path (202), and a transport path (210). 202) may be provided with a measuring unit (208) configured to measure the temperature of the iron core body (10) being conveyed. In addition, an example of the manufacturing apparatus (100) of the iron core product (1) is configured to operate the heat retaining unit (210) when the temperature measured by the measuring unit (208) falls below a predetermined temperature. A control unit (Ctr) may be provided. In this case, the same effect as the method of Example 1 can be obtained.

Example 9. In the apparatus (100) of Example 8, in the control unit (Ctr), the temperature measured by the measuring unit (208) is lower than the predetermined temperature, and the transport speed of the iron core main body (10) in the transport path (202) is predetermined. The heat retaining unit (210) may be configured to operate when the speed is lower than the above speed. In this case, the same effect as the method of Example 2 can be obtained.

Example 10. In the apparatus (100) of Example 8 or Example 9, the heat retaining unit (210) may be configured to at least keep the iron core body (10) being transported on the upstream side of the transport path (202) warm. In this case, the same effect as the method of Example 3 can be obtained.

Example 11. In the apparatus (100) of Examples 8 to 10, the heat insulating unit (210) may include a covering member (216) that covers at least a part of the transport path (202). In this case, the same effect as the method of Example 4 can be obtained.

Example 12. In any of the devices (100) of Examples 8 to 11, the control unit (Ctr) operates the heat retaining unit (210) when the temperature measured by the measuring unit (208) falls below a predetermined temperature. It may be configured in. In this case, the same effect as the method of Example 5 can be obtained.

Example 13. In any of the devices (100) of Examples 8 to 12, the control unit (Ctr) stops the cooling unit (206) when the temperature measured by the measuring unit (208) falls below a predetermined temperature. , The heat retaining unit (210) may be configured to operate. In this case, the same effect as the method of Example 6 can be obtained.

Example 14. The device (100) according to any one of Examples 8 to 13 has a heating unit (214) configured to heat the iron core body (10) and a heating unit (202) from the transport path (202) to the iron core body (10). It may further include a discharge unit (212) configured to discharge to 214). When the temperature measured by the measuring unit (208) falls below a predetermined lower limit value, the control unit (Ctr) moves the iron core body (10) from the transport path (202) to the heating unit (214) by the discharging unit (212). It may be configured to be discharged to. In this case, the same effect as the method of Example 7 can be obtained.

1 ... Rotor (iron core product), 2 ... Rotor laminated iron core, 10 ... Laminated body (iron core body), 16 ... Magnet insertion hole (resin injection part), 100 ... Manufacturing equipment, 140 ... Resin injection equipment, 150 ... Welding Equipment (subsequent processing equipment), 160 ... shaft mounting equipment (subsequent processing equipment), 200A to 200C ... transport equipment, 202 ... transport path, 204 ... conveyor, 206 ... cooler (cooling unit), 208 ... temperature sensor ( Measurement unit), 210 ... Heat insulation device (heat insulation unit), 212 ... Discharge device (discharge unit), 214 ... Heating device (heating unit), 216 ... Covering member, 218 ... Drive mechanism, Ctr ... Controller (control unit).

Claims (14)

By arranging the iron core body provided with the resin injection part in the resin injection device and injecting the molten resin into the resin injection part,
In the process of transporting the iron core body by a transport path extending between the resin injection device and the subsequent processing device, cooling the iron core body and
A method for manufacturing an iron core product, which comprises keeping the iron core body warm when the temperature of the iron core body being conveyed through the transport path is lower than a predetermined temperature. Keeping the iron core body warm means that the temperature of the iron core body being transported through the transport path is lower than the predetermined temperature and the transport speed of the iron core body in the transport path is lower than the predetermined speed. The method according to claim 1, which comprises keeping the iron core body warm. The method according to claim 1 or 2, wherein keeping the iron core body warm at least keeps the iron core main body warm while transporting the upstream side of the transport path. The method according to any one of claims 1 to 3, wherein keeping the iron core body warm includes at least partially covering the transport path with a covering member. The warming of the iron core main body includes keeping the iron core main body warm when the temperature of the iron core main body being conveyed downstream of the transport path is lower than the predetermined temperature, according to claims 1 to 4. The method according to any one item. Insulating the iron core body includes keeping the iron core body warm while stopping the cooling of the iron core body when the temperature of the iron core body being conveyed through the transport path falls below a predetermined temperature. The method according to any one of claims 1 to 5. Any one of claims 1 to 6, further comprising removing the iron core body from the transport path and reheating when the temperature of the iron core body being transported through the transport path is lower than a predetermined lower limit value. The method described in the section. A resin injection device configured to inject molten resin into the resin injection section provided in the iron core body, and
Subsequent processing equipment of the resin injection equipment and
A transport path configured to extend between the resin injection device and the processing device,
A cooling unit configured to cool the inside of the transport path, and
A heat insulating unit configured to keep the iron core body being conveyed in the transport path warm.
A measuring unit configured to measure the temperature of the iron core body being transported through the transport path, and a measuring unit configured to measure the temperature of the iron core body.
An iron core product manufacturing apparatus including a control unit configured to operate the heat retaining unit when the temperature measured by the measuring unit falls below a predetermined temperature. The control unit is configured to operate the heat retaining unit when the temperature measured by the measuring unit is lower than the predetermined temperature and the transport speed of the iron core main body in the transport path is lower than the predetermined speed. The device according to claim 8. The device according to claim 8 or 9, wherein the heat retaining unit is configured to at least keep the iron core body being transported upstream of the transport path warm. The device according to any one of claims 8 to 10, wherein the heat insulating portion includes a covering member that covers at least a part of the transport path. The device according to any one of claims 8 to 11, wherein the control unit is configured to operate the heat retaining unit when the temperature measured by the measuring unit is lower than the predetermined temperature. .. Any of claims 8 to 12, wherein the control unit is configured to operate the heat retaining unit while stopping the cooling unit when the temperature measured by the measuring unit falls below a predetermined temperature. The device according to one item. A heating unit configured to heat the iron core body and
Further provided with a discharge unit configured to discharge the iron core body from the transport path to the heating unit.
The control unit is configured to discharge the iron core body from the transport path to the heating unit by the discharge unit when the temperature measured by the measurement unit is lower than a predetermined lower limit value. The apparatus according to any one of 8 to 13.

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