JP7052109B2 - Manufacturing equipment and manufacturing method for laminated iron cores - Google Patents

Description

The present invention relates to an apparatus and method for manufacturing a laminated iron core, and more particularly to an apparatus and method for producing an adhesive type laminated iron core in which a plurality of laminated iron core thin plates are bonded with an adhesive.

As a laminated iron core used for stators and rotors of rotary electric machines, a thin iron core plate punched from a strip-shaped thin steel plate that is intermittently transferred by a progressive die including multiple punching dies (die sets) using punches and dies. Is known as an adhesive type laminated iron core, which is formed by sequentially laminating in a die and adhering them with an adhesive such as an epoxy resin adhesive (Patent Documents 1 and 2).

Japan Patent Office Published Patent Gazette 2001-321850 Japan Patent Office Published Patent Gazette 2009-124828

The application of the adhesive to the adhesive-applied surface of the iron core thin plate (belt-shaped thin steel plate) is accurate at the specified position on the adhesive-applied surface so that the adhesive strength as designed is obtained and the adhesive does not drip to the outside. Need to be done in. Further, it is required that the adhesive on the adhesive-coated surface does not diffuse or scatter around due to the vibration of the iron core thin plate (strip-shaped thin steel plate) when it moves.

An object to be solved by the present invention is to ensure that the adhesive is accurately applied to the adhesive-coated surface.

The apparatus for producing a laminated iron core according to the present invention is an apparatus for producing a laminated iron core formed by laminating and adhering a thin iron core plate formed by punching a strip-shaped thin steel plate into a predetermined shape, and is an upper holder, a lower holder, and the upper holder. A plurality of punches and dies provided in the lower holder for sequentially punching the iron core thin plate from the strip-shaped thin steel plate to be intermittently transferred, and the strip-shaped thin steel plate provided in the lower holder along the intermittent transfer direction of the strip-shaped thin steel plate. A guide member that guides the transfer of the strip-shaped thin steel plate and restricts the upward movement of the strip-shaped thin steel plate, and the iron core thin plate of the strip-shaped thin steel plate provided on at least one of the upper holder and the lower holder. It has an adhesive application device that applies an adhesive to the adhesive application surface of the portion corresponding to the above.

According to this configuration, the strip-shaped thin steel plate is applied with the adhesive to the adhesive-coated surface in a state where the movement of the strip-shaped thin steel plate is restricted by the guide member, so that the adhesive can be applied to the adhesive-coated surface. It is done accurately.

The guide member has a structure that restricts the upward movement of the strip-shaped thin steel plate by contact with the strip-shaped thin steel plate, and a structure that restricts the lateral movement of the strip-shaped thin steel plate by contact with the strip-shaped thin steel plate. And guide the intermittent transfer of the strip-shaped thin steel plate.

In this case, since the adhesive is applied to the adhesive-coated surface of the strip-shaped thin steel plate in a state where the movement in the left-right direction is restricted in addition to the restriction of upward movement, the adhesive is applied to the adhesive-coated surface. The application of the adhesive is performed more accurately.

The apparatus for manufacturing a laminated iron core according to the present invention preferably has a pilot pin provided in the upper holder and inserted into a pilot hole formed in the strip-shaped thin steel plate in order to position the strip-shaped thin steel plate at each transfer position. Have more.

According to this configuration, the adhesive is applied to the adhesive-coated surface in a state where the pilot pin is inserted into the pilot hole formed in the strip-shaped thin steel plate, so that the adhesive can be applied to the adhesive-coated surface. It is done accurately.

The apparatus for manufacturing a laminated iron core according to the present invention preferably further has a stripper plate provided on the upper holder so as to be vertically displaceable and having a lower surface facing the upper surface of the die.

According to this configuration, the stripper plate can limit the vertical movement of the strip-shaped thin steel plate, and the adhesive is accurately applied to the adhesive-coated surface.

The apparatus for producing a laminated iron core according to the present invention preferably further has a stripper spring for urging the stripper plate toward the lower holder, and the stripper plate is thinned by the spring force of the stripper spring. The steel plate is configured to be pressed against the upper surface of the die.

According to this configuration, the adhesive can be applied to the adhesive-applied surface when the strip-shaped thin steel plate is pressed against the die by the stripper plate or in the pressed state, and the adhesive is applied to the adhesive-applied surface. Is done exactly.

The apparatus for producing a laminated iron core according to the present invention preferably presses the strip-shaped thin steel plate against the upper surface of the die until the punch comes out of the die, and more preferably until the punch comes out of the strip-shaped thin steel plate. It is configured as follows.

According to this configuration, in the ascending process of the upper holder after punching, the strip-shaped thin steel plate is placed on the upper surface of the die by the stripper plate until the punch is pulled out from the die or the punch is pulled out from the strip-shaped thin steel plate. Since the pressed state is maintained, the strip-shaped thin steel plate is suppressed from shaking during the ascending process of the upper holder, and the adhesive applied to the strip-shaped thin steel plate is suppressed from scattering.

In the laminated iron core manufacturing apparatus according to the present invention, preferably, the pilot pin includes a straight shaft portion, and the straight shaft portion is in the most lowered position with respect to the upper holder due to the bias of the stripper plate by the stripper spring. In the state, it is in a position protruding downward from the lower surface of the stripper plate.

According to this configuration, in the lowering process of the upper holder, the straight shaft portion of the pilot pin enters the pilot hole before the lower surface of the stripper plate abuts on the strip-shaped thin steel plate, so that the strip-shaped thin steel plate is restrained by the stripper plate. The strip-shaped thin steel plate can be smoothly positioned without being disturbed.

The apparatus for manufacturing a laminated iron core according to the present invention is preferably provided on the lower holder so as to be vertically displaceable, and abuts on the lower surface of the strip-shaped thin steel plate to separate the strip-shaped thin steel plate from the upper surface of the die. Further has a plurality of lifters.

According to this configuration, the strip-shaped thin steel plate can be lifted up from the upper surface of the die during intermittent transfer of the strip-shaped thin steel plate, and even if the adhesive-coated surface is the lower surface of the strip-shaped thin steel plate, it is applied to the adhesive-coated surface. The adhesive is not rubbed by the top surface of the die.

The apparatus for manufacturing a laminated iron core according to the present invention is preferably provided on the lower holder so as to be displaceable in the vertical direction, and abuts on the lower surface of the strip-shaped thin steel plate to separate the strip-shaped thin steel plate from the upper surface of the die. With the plurality of lifters and the stripper plate in contact with the upper surface of the strip-shaped thin steel plate and each lifter in contact with the lower surface of the strip-shaped thin steel plate when the stripper plate is raised, the strip-shaped thin steel plate is placed on the die. It further has a plurality of lifter springs that urge each lifter upward so as to be separated from the upper surface.

According to this configuration, after the adhesive is applied, the iron core thin plate is returned to the lift-up state (separated state) while the iron core thin plate is supported from above and below by the lifter and the stripper plate. The swaying of the strip-shaped thin steel plate is suppressed, and the scattering of the adhesive applied to the strip-shaped thin steel plate is suppressed.

In the laminated iron core manufacturing apparatus according to the present invention, each lifter preferably serves as the guide member.

According to this configuration, the number of parts can be reduced.

When the lifter also serves as a guide member, the lifter may be configured by a lifter pin having a peripheral groove on the upper outer periphery, and may have a structure in which the left and right side edges of the strip-shaped thin steel plate enter the peripheral groove. In this case, in the state where the strip-shaped thin steel plate is lifted up by the lifter, the strip-shaped thin steel plate is restricted from moving upward and downward according to the vertical width of the peripheral groove, and the strip-shaped thin steel plate during intermittent transfer is restricted. Fluttering is suppressed.

The device for producing a laminated iron core according to the present invention preferably faces the adhesive-coated surface in order for the adhesive-applying device to transfer the adhesive to each of a plurality of predetermined positions on the adhesive-coated surface. It is a transfer type that includes a plurality of discharge holes for discharging the adhesive.

According to this configuration, the adhesive is accurately applied to the adhesive coated surface by transfer.

The device for producing a laminated iron core according to the present invention preferably has an adhesive supply device for supplying the adhesive to each of the discharge holes with a predetermined pressure, and the adhesive application device has the adhesive to each of the discharge holes. It has an advancing / retreating driving device for moving the adhesive between a transfer position where the adhesive can be transferred and a non-transfer position where the adhesive cannot be transferred by retracting from the transfer position with respect to the agent-coated surface.

According to this configuration, the transfer of the adhesive to the adhesive-coated surface and the non-transfer are selectively set only by selectively setting the position of the discharge hole to either the transfer position or the non-transfer position.

The apparatus for producing a laminated iron core according to the present invention is an apparatus for producing a laminated iron core formed by laminating and adhering thin iron core plates punched and formed into a predetermined shape from a strip-shaped thin steel plate, and is an upper holder, a lower holder, and the upper holder. A plurality of punches and dies provided in the lower holder for sequentially punching the iron core thin plate from the strip-shaped thin steel plate intermittently transferred, and the strip-shaped thin steel plate provided in the upper holder for positioning the strip-shaped thin steel plate at each transfer position. A pilot pin inserted into a pilot hole formed in a strip-shaped thin steel plate, a stripper plate provided on the upper holder so as to be displaceable in the vertical direction and having a lower surface facing the upper surface of the die, and the stripper plate on the lower side. A stripper spring that urges the holder, a plurality of lifters that are vertically displaceable on the lower holder and abut on the lower surface of the strip-shaped thin steel plate, and the stripper plate when the stripper plate is raised. Each lifter is urged upward so that the strip-shaped thin steel plate is levitated from the upper surface of the die in a state where the strip-shaped thin steel plate is in contact with the upper surface of the strip-shaped thin steel plate and each lifter is in contact with the lower surface of the strip-shaped thin steel plate. Adhesive application is provided on at least one of the plurality of lifter springs and the upper holder and the lower holder, and the adhesive is applied to the adhesive-applied surface of the portion of the strip-shaped thin steel plate corresponding to the iron core thin plate. Has a device.

According to this configuration, the pilot pin is inserted into the pilot hole of the strip-shaped thin steel plate, and the adhesive is applied to the adhesive-coated surface when the strip-shaped thin steel plate is pressed or pressed against the upper surface of the die by the stripper plate. Can be performed, and the adhesive is accurately applied to the adhesive-applied surface. Moreover, after the adhesive is applied, the strip-shaped thin steel plate is returned to the lift-up state while the strip-shaped thin steel plate is supported from above and below by the lifter and the stripper plate, so that the strip-shaped thin steel plate is prevented from shaking during the floating process of the strip-shaped thin steel plate. Therefore, it is possible to prevent the adhesive applied to the strip-shaped thin steel plate from scattering.

The method for manufacturing a laminated iron core according to the present invention is a method for manufacturing a laminated iron core obtained by laminating and adhering thin iron core plates formed by punching a strip-shaped thin steel plate into a predetermined shape using a press device having an upper holder and a lower holder. Therefore, the strip-shaped thin steel plate is intermittently provided in a state where the guide member provided on the lower holder restricts the upward movement of the strip-shaped thin steel plate to guide the transfer along the intermittent transfer direction of the strip-shaped thin steel plate. The transfer step of transferring, the punching step of punching the outer shape of the iron core thin plate by the punches and dies provided on the upper holder and the lower holder by the descent of the upper holder, and the upper holder before the punching step. It also has a coating step of applying an adhesive to the adhesive-applied surface of the strip-shaped thin steel sheet by an adhesive-applying device provided on at least one of the lower holders.

According to this manufacturing method, the intermittent transfer of the strip-shaped thin steel plate is guided by the guide member, and the adhesive is applied to the adhesive-coated surface in a state where the guide member restricts the strip-shaped thin steel plate from moving upward. Therefore, the adhesive is accurately applied to the adhesive-applied surface.

In the method for manufacturing a laminated iron core according to the present invention, preferably, the transfer step is provided up and down on the lower holder in a state where the upper holder is raised, and is urged upward by a lifter spring. The strip-shaped thin steel plate is intermittently transferred by the lifter in a lift-up state away from the upper surface of the die provided in the lower holder.

According to this manufacturing method, even if the adhesive-applied surface is the lower surface of the strip-shaped thin steel plate, the adhesive applied to the adhesive-applied surface is not rubbed by the upper surface of the die.

In the method for manufacturing a laminated iron core according to the present invention, preferably, the pilot pin provided in the upper holder is inserted into a pilot hole formed in the strip-shaped thin steel plate during the descent of the upper holder after the completion of the transfer step. It further comprises a pilot insertion step of insertion.

According to this manufacturing method, since the strip-shaped thin steel sheet is accurately positioned, the adhesive is accurately applied to the adhesive-coated surface.

In the method for manufacturing a laminated iron core according to the present invention, a stripper plate suspended by a stripper spring is preferably attached to the upper holder, and the strip-shaped thin steel plate is attached to the upper holder during the descent of the upper holder after the completion of the pilot insertion step. Further, it has a pressing step of pressing the lifter against the upper surface of the die provided on the lower holder with the descent movement of the lifter.

According to this manufacturing method, the strip-shaped thin steel plate is pressed against the upper surface of the die after the completion of the pilot insertion step. In other words, the strip-shaped thin steel plate is pressed against the upper surface of the die and restrained. Since the pilot pin is inserted into the pilot hole of the strip-shaped thin steel plate, the pilot pin is smoothly inserted into the pilot hole.

In the method for producing a laminated iron core according to the present invention, preferably, in the coating step, the pilot pin is inserted into the pilot hole, and the strip-shaped thin steel plate is made of the die by the stripper plate with the descent movement of the lifter. When the adhesive is applied when pressed against the upper surface or in the pressed state, the lifter is moved to the lower surface of the strip-shaped thin steel plate by raising the upper holder after the application of the adhesive is completed. The strip-shaped thin steel plate is returned to the lift-up state in a state where the stripper plate is in contact with the upper surface of the strip-shaped thin steel plate.

According to this manufacturing method, the adhesive is applied to the adhesive-applied surface when the strip-shaped thin steel plate is pressed against the die by the stripper plate or in the pressed state, so that the adhesive is accurately applied to the adhesive-applied surface. It is done in. Moreover, the strip-shaped thin steel plate is suppressed from shaking during the ascending process of the upper holder, and the adhesive applied to the strip-shaped thin steel plate is suppressed from scattering.

The method for manufacturing a laminated iron core according to the present invention is a method for manufacturing a laminated iron core obtained by laminating and adhering thin iron core plates formed by punching a strip-shaped thin steel plate into a predetermined shape using a press device having an upper holder and a lower holder. Therefore, in a state where the upper holder is raised, the lifter is vertically provided on the lower holder in a manner of being urged upward by the lifter spring and urged upward by the lifter spring. The strip-shaped thin steel plate is intermittently transferred in a lift-up state away from the upper surface of the die provided in the lower holder, and the pilot pin provided in the upper holder is transferred after the transfer step is completed. During the descent of the upper holder, the pilot insertion step of inserting into the pilot hole formed in the strip-shaped thin steel plate and the stripper plate suspended by the stripper spring in the upper holder are attached to the upper holder after the completion of the pilot insertion step. During the descent of the upper holder, the strip-shaped thin steel plate is pressed against the upper surface of the die provided on the lower holder with the descent movement of the lifter, and the strip-shaped thin steel plate is set in a row at intervals in the intermittent transfer direction. At each of the plurality of press positions, after the pressing process is completed, the upper holder is further lowered, and the strip-shaped thin steel plate is formed by a plurality of mold sets using punches and dies provided on the upper holder and the lower holder. Between the punching process of sequentially punching the inner shape and the outer shape and the press position for punching the inner shape and the press position for punching the outer shape, these press positions are set in line with the upper holder and the lower holder. It has a coating step of applying an adhesive to an adhesive-applied surface of the strip-shaped thin steel sheet by an adhesive-applying device provided on at least one of the strip-shaped thin steel sheets, in which the pilot pin is inserted into the pilot hole and the pilot pin is inserted into the pilot hole. When the strip-shaped thin steel plate is pressed against or in the pressed state by the stripper plate with the descent movement of the lifter, the adhesive is applied, and the upper holder is raised after the application of the adhesive is completed. As a result, the strip-shaped thin steel plate is returned to the lift-up state in a state where the lifter is in contact with the lower surface of the strip-shaped thin steel plate and the stripper plate is in contact with the upper surface of the strip-shaped thin steel plate with the ascending movement of the lifter. ..

According to this manufacturing method, the pilot pin is inserted into the pilot hole of the strip-shaped thin steel plate, and the strip-shaped thin steel plate is pressed against the upper surface of the die by the stripper plate, or when the strip-shaped thin steel plate is pressed against the upper surface of the die. Since the coating is performed, the adhesive is accurately applied to the adhesive coating surface. Moreover, after the adhesive is applied, the strip-shaped thin steel plate is returned to the lift-up state while the strip-shaped thin steel plate is supported from above and below by the lifter and the stripper plate. Is suppressed, and the adhesive applied to the strip-shaped thin steel plate is suppressed from scattering.

In the method for producing a laminated iron core according to the present invention, preferably, in the coating step, the adhesive is discharged from each of the plurality of ejection holes toward the adhesive coating surface, and the adhesive is discharged at a plurality of predetermined positions on the adhesive coating surface. Each includes a step of transferring the adhesive.

According to this manufacturing method, the adhesive is finely and accurately applied to the adhesive-coated surface by transfer.

In the method for producing a laminated iron core according to the present invention, the iron core thin plate includes a plurality of teeth portions, and the teeth portions have at least one coating point.

According to this manufacturing method, thin plates of iron cores adjacent to each other are bonded to each other even in the teeth portion, and a laminated iron core having high adhesive strength is produced.

According to the apparatus and method for manufacturing a laminated iron core according to the present invention, the adhesive is accurately applied to the adhesive-coated surface.

Top view showing an example of an iron core thin plate used for a stator of a stepping motor Explanatory drawing which shows the strip layout in the progressive die apparatus used for manufacturing the iron core thin plate shown in FIG. A plan view showing an iron core thin plate which is a model of the iron core thin plate manufactured by the manufacturing apparatus and the manufacturing method of the laminated iron core according to the present invention. Explanatory drawing which shows one Embodiment of the strip layout in the progressive die apparatus used for manufacturing the laminated iron core shown in FIG. Schematic block diagram showing one embodiment of the laminated iron core manufacturing apparatus according to the present invention. Sectional drawing which shows the adhesive apparatus used for the manufacturing apparatus of the laminated iron core by this embodiment. Enlarged sectional view of the main part of the adhesive device according to this embodiment Cross-sectional view of the internal punching station of the manufacturing apparatus according to the present embodiment in the top dead center state. Cross-sectional view of the adhesive application station of the manufacturing apparatus according to the present embodiment in a top dead center state. Cross-sectional view in the descent process 1 of the internal punching station of the manufacturing apparatus according to the present embodiment. Cross-sectional view of the adhesive application station of the manufacturing apparatus according to the present embodiment in the descent process 1. Cross-sectional view in the descent process 2 of the internal punching station of the manufacturing apparatus according to the present embodiment. Cross-sectional view of the adhesive application station of the manufacturing apparatus according to the present embodiment in the descent process 2. Cross-sectional view in the descent process 3 of the internal punching station of the manufacturing apparatus according to the present embodiment. Cross-sectional view of the adhesive application station of the manufacturing apparatus according to the present embodiment in the descent process 3. Cross-sectional view of the internal punching station of the manufacturing apparatus according to the present embodiment in the bottom dead center state. Cross-sectional view of the adhesive application station of the manufacturing apparatus according to the present embodiment in the bottom dead center state. Cross-sectional view of the internal punching station of the manufacturing apparatus according to the present embodiment in the ascending process 1. Cross-sectional view of the adhesive application station of the manufacturing apparatus according to the present embodiment in the ascending process 1. Cross-sectional view of the internal punching station of the manufacturing apparatus according to the present embodiment in the ascending process 2. Cross-sectional view of the adhesive application station of the manufacturing apparatus according to the present embodiment in the ascending process 2. Cross-sectional view of the internal punching station of the manufacturing apparatus according to the present embodiment in the ascending process 3. Cross-sectional view of the adhesive application station of the manufacturing apparatus according to the present embodiment in the ascending process 3. Enlarged sectional view of the lift-up portion in the top dead center state of the manufacturing apparatus according to the present embodiment. Enlarged sectional view of the lift-up portion in the descent process 2 of the manufacturing apparatus according to the present embodiment. Enlarged sectional view of the lift-up portion in the bottom dead center state of the manufacturing apparatus according to the present embodiment. Enlarged sectional view of the lift-up portion in the ascending process 1 of the manufacturing apparatus according to the present embodiment. Explanatory drawing which shows other embodiment of strip layout in the progressive die apparatus used for manufacturing the laminated iron core shown in FIG. Explanatory drawing which shows other embodiment of strip layout in the progressive die apparatus used for manufacturing the laminated iron core shown in FIG. Cross-sectional view of the internal punching station of the manufacturing apparatus according to another embodiment in the top dead center state. Cross-sectional view of the adhesive application station of the manufacturing apparatus according to another embodiment in the top dead center state.

A preferred embodiment of the present invention will be described with reference to the accompanying drawings.

First, as a specific example of the laminated iron core, the laminated iron core used for the stator of the stepping motor will be described with reference to FIG.

The laminated iron core is formed by laminating a plurality of iron core thin plates A having the same shape. The iron core thin plate A is a strip-shaped thin steel plate, that is, a hoop material F, which is punched into a predetermined shape by press working using a progressive die, and has an annular yoke portion B by external punching and a diameter from the yoke portion B. It has a plurality of teeth portions (magnetic pole portions) C formed by punching inwardly in the direction and a plurality of through holes D punched and formed in the yoke portion B, and has one surface of the yoke portion B and the teeth portion C. Adhesives applied in a circle shape to a plurality of coating points E1 and E2 on the (adhesive coating surface) adhere to each other.

The adhesive used here is an anaerobic adhesive (adhesive + curing accelerator), a one-component epoxy resin-based adhesive, and a two-component epoxy resin-based adhesive (adhesive first liquid + adhesive second). Liquid or main agent + initiator), heat-curable adhesives such as acrylic resin adhesives, moisture-curable adhesives and the like.

In FIG. 1, for convenience of explanation, the coating points E1 and E2 are shown on the upper surface of the iron core thin plate A, but in reality, the adhesive is applied to the lower surface of the iron core thin plate A at each coating point E1 and E2. It is set on the lower surface of the iron core thin plate A so that it can be applied to the adhesive application surface).

In the manufacturing process of the laminated iron core, as shown in FIG. 2, the first half punching steps 1 to 5 and the adhesive application are performed under the intermittent transfer of the hoop material F in the progressive die device (manufacturing device of the laminated iron core). It has a step 6, an outer shape punching step 7, a rotary laminating step 8, and a heating step 9 in this order.

In the first half punching step, the pilot hole P is punched in the hoop material F, the inner pilot hole d1 and the through hole D are punched 2, the slot portion S1 is punched 3, and the inner d2 is punched. Machining 4 and punching 5 of the slit S2 between the teeth and the grooved portion m at the tip of the teeth are sequentially performed by each die set (not shown) with a punch and a die having a shape corresponding to each punching, and the iron core thin plate. The basic shape excluding the outer shape punching of A is formed.

The adhesive application step 6 is carried out after the first half punching steps 1 to 5. As the details of the application of the adhesive to the hoop material F are shown in FIG. 1, a plurality of application points E1 and each tooth portion C in which the yoke portion B is set at a position corresponding to each slot portion S1. It is performed in a round dot shape at each of the coating points E2 set at the two locations of. Here, a known anaerobic adhesive is used as the adhesive. Further, also in FIG. 2, for convenience of explanation, the coating points E1 and E2 are shown on the upper surface side of the iron core thin plate A, but in reality, the coating points E1 and E2 are set on the lower surface side of the iron core thin plate A. To.

The outer shape punching step 7 is carried out after the completion of the adhesive application step 6. The outer shape punching step 7 is performed by a die set (not shown) using a punch and a die having a shape corresponding to the outer shape d3 of the iron core thin plate A.

The rotary laminating step 8 is carried out following the outer shape punching step 7. The die of the outer shape punching step 7 is a rotary die, and each time the outer shape of one iron core thin plate A is punched, the die is rotated by a predetermined angle, for example, 90 degrees around its own central axis. As a result, the iron core thin plate A punched in the outer shape punching step 7 is sequentially laminated on the iron core thin plate group G that has already been punched and laminated in the rotary die while changing the position around the central axis. .. It is possible to accurately manage the stacking thickness of the product (laminated iron core) by eliminating the influence of the minute plate thickness deviation that may occur in each iron core thin plate A by this rotary lamination. Then, the iron core thin plate group G is sequentially pushed into a squeeze ring (not shown) connected below the rotating die.

When the newly punched iron core thin plate A is laminated on the iron core thin plate group G, the lower surface of the newly punched iron core thin plate A is on the upper surface of the iron core thin plate A located at the uppermost layer of the iron core thin plate group G. The adhesive applied in a round shape to each of the application points E1 and E2 on the lower surface of the newly punched iron core thin plate A by the close contact is previously applied to the upper surface of the iron core thin plate A located on the uppermost layer. It is mixed with the curing accelerator.

The heating step 9 is carried out after the completion of the rotary laminating step 8. A heating device (not shown) is provided in the lower part of the squeeze ring, and the iron core thin plate group G is heated while moving downward by this heating device. As a result, the adhesive between the thin iron core plates A can be cured by heating to increase the adhesive strength. As a heating device for such an adhesive, for example, a heater device that blows hot air onto the iron core thin plate group G can be used. After heating by the heating device, the iron core thin plate group G is separated at the position of the iron core thin plate A for each weighing, and the laminated iron core M composed of a predetermined number of iron core thin plates A is completed.

Next, one embodiment of the laminated iron core manufacturing apparatus 10 will be described with reference to FIGS. 4 and 5. In the following description, for the sake of simplification of the description, as shown in FIG. 3, the iron core thin plate W schematically formed in an annular shape will be described. The iron core thin plate W is formed by punching out a circular inner shape IS and punching out a circular outer shape OS, and is set at a plurality of locations in the circumferential direction of the lower surface (adhesive coating surface) of the annular portion R obtained by punching out the circular inner shape IS. The adhesive is applied in dots to each of the applied application points E.

The manufacturing apparatus 10 is based on a progressive die method, and as shown in FIGS. 4 and 5, a pilot hole punching station I, an internal punching station II, an idle station III, and an adhesive application station are used. IV, idle station V, external punching station VI, and idle station VII are provided in order in the progressive feed direction, and under intermittent transfer of the hoop material F in the progressive feed direction, each other than idle stations III, V, and VII. Stations I, II, IV, VI perform each step. The punched portions performed in each of the pilot hole punching station I, the inner punching station II, and the outer punching station VI are indicated by diagonal lines. At idle stations III, V, and VII, the hoop material F is idlely fed.

The manufacturing apparatus 10 is fixed to the upper surface of the plate-shaped upper holder 12 fixed to the lower surface of the upper ram (not shown) of the press machine and the upper holder 12 to face the upper surface of the lower table (not shown) of the press machine. It has a plate-shaped lower holder 14.

At the lower part of the upper holder 12, the backing plate 16 and the punch plate 18 provide a pilot hole punching punch 20, an internal punching punch 22, and an outer punching punch 24 at positions corresponding to the stations I, II, and VI. It is attached.

A stripper 28 is attached below the upper holder 12 so as to be vertically displaceable by a hanging bolt (not shown). The stripper 28 is set to the maximum lowering position with respect to the upper holder 12 by hanging support by a hanging bolt (not shown). The stripper 28 is composed of a joint body of the plate-shaped stripper main body 30 and the stripper plate 32, and the lower surface 33 of the stripper plate 32 faces the die plate 40 and the upper surface 47 of each die 42, 44, 46 described later. In other words, the stripper plate 32 has a die plate 40 and a lower surface 33 facing the upper surface 47 of each die 42, 44, 46. The stripper plate 32 is formed with punch insertion holes 34, 36, and 38 through which the punches 20, 22, and 24 pass.

A plate-shaped die plate 40 is attached to the upper surface of the lower holder 14. A pilot hole punching die 42, an inner punching die 44, and an outer punching die 46 are attached to the die plate 40 at positions corresponding to the punching stations I, II, and VI. Pilot hole punch 20 and pilot hole punching die 42, inner punching punch 22 and inner punching die 44, outer punching punch 24 and outer punching die 46 correspond to each other, and each is a die set. Is doing.

Since the upper surfaces of the die plate 40 and the dies 42, 44, and 46 are flush with each other, the upper surfaces thereof are hereinafter collectively referred to as the upper surface 47 of the die plate 40.

An adhesive application device 50 is provided at a position where the die plate 40 corresponds to the adhesive application station IV. The adhesive application device 50 moves up and down by the cam mechanism 52 driven by the drive device 54, and when it is in the ascending position, each press operation except for the time of weighing for setting the number of laminated iron core thin plates W. The adhesive is applied (transferred) in dots to a plurality of locations (application points E) on the lower surface of the hoop material F.

In the pilot hole punching station I, the pilot hole punching punch 20 and the pilot hole punching die 42 make the pilot hole P in the hoop material F for each press operation, in other words, for each intermittent transfer of the hoop material F. (See FIG. 4) is punched out. The pilot holes P are provided in the vicinity of the edges on both sides (left and right sides) of the hoop material F in the intermittent transfer direction (forward feed direction).

In the inner punching station II, the inner punching punch 22 and the inner punching die 44 punch the inner shape IS (see FIG. 4) into the hoop material F for each intermittent transfer of the hoop material F. Will be.

In the adhesive application station IV, the adhesive is applied in a round dot shape to the application point E on the lower surface of the hoop material F by the adhesive application device 50 at the ascending position. At the time of weighing to set the number of laminated iron core thin plates W generated for each intermittent transfer, the adhesive application device 50 descends to the descending position, so that the application of the adhesive to the hoop material F is suspended.

In the outer shape punching station VI, the outer shape OS (see FIG. 4) is punched into the hoop material F by the outer shape punching punch 24 and the outer shape punching die 46. By this punching, the iron core thin plate W is completed, and the iron core thin plate W descends and is sequentially laminated in the outer shape punching die 46. The iron core thin plates W laminated in the outer shape punching die 46 are bonded to each other by the adhesive at the coating point E, except for the measuring plate to which the adhesive is not applied, which are vertically overlapped with each other.

The laminated body of the iron core thin plate W is taken out downward and outward from the discharge hole 48 formed in the lower holder 14 in the outer shape punching station VI, and is transferred to a post-treatment step for heat curing of the adhesive as necessary. Will be done.

Next, the details of the adhesive coating device 50 will be described with reference to FIGS. 6 and 7.

The adhesive coating device 50 is a transfer type and has a coating table 60 formed by connecting an upper block 58 and a lower block 59. The coating table 60 is vertically and vertically fitted into the holding holes 56 formed in the lower holder 14 and the die plate 40.

A cam mechanism 52 is provided at the lower part of the coating table 60. The cam mechanism 52 includes a fixed cam 74 with a plate cam fixed to the bottom of the lower block 59 and a moving cam 76 with a plate cam movably provided at the bottom of the lower block 59. The moving cam 76 is connected to the drive device 54 and is reciprocally driven by the drive device 54 in the left-right direction as seen in FIG. The fixed cam 74 includes a sawtooth shape portion having sawtooth ridges 74A and sawtooth valleys 74B alternately in the left-right direction on the lower surface, and the moving cam 76 has sawtooth ridges 76A and sawtooth valleys 76B alternately on the upper surface. Includes the sawtooth shape.

As shown, when the moving cam 76 is located at a position where the sawtooth ridge portion 74A of the fixed cam 74 and the sawtooth ridge portion 76A of the moving cam 76 coincide with each other, the coating table 60 is located at the ascending position (transfer position). In the ascending position, the upper surface 61 of the upper block 58 is located below the upper surface 47 of the die plate 40 by the step α.

When the moving cam 76 is driven to the left side as seen in FIG. 6 by the driving device 54 and the moving cam 76 is positioned at a position where the sawtooth valley portion 74B of the fixed cam 74 and the sawtooth ridge portion 76A of the moving cam 76 are aligned with each other, the coating is applied. The table 60 and the fixed cam 74 descend (retract downward), and the coating table 60 is located at the descending position. In this descent position (non-transfer position), the upper surface 61 of the upper block 58 is located below the upper surface 47 of the die plate 40 with a large step exceeding the step α.

The upper block 58 has an adhesive pool 62 formed by an annular groove, and a plurality of adhesive pools 62 extending vertically (vertically) from the adhesive pool 62 to the horizontal upper surface 61 of the upper block 58 and opening to the upper surface 61. A discharge hole 64 is formed. Each discharge hole 64 is arranged at a position corresponding to each coating point E of the hoop material F (iron core thin plate W) located at the adhesive coating station IV.

An internal block 66 is installed in the upper block 58. The inner block 66 is formed with an adhesive supply passage 68 for supplying the adhesive to the adhesive reservoir 62. A flexible adhesive supply tube 70 is connected to the adhesive supply passage 68. The adhesive supply tube 70 is connected to the adhesive supply device 72. The adhesive supply device 72 pressurizes the adhesive to a predetermined pressure, measures the pressurized adhesive, and supplies the pressurized adhesive to the adhesive reservoir 62 via the adhesive supply tube 70 and the adhesive supply passage 68 at a predetermined flow rate. .. As a result, the adhesive is constantly supplied to each discharge hole 64 from the adhesive pool portion 62 with a predetermined pressure.

In this embodiment, two adhesive supply tubes 70 and two adhesive supply passages 68 are provided, and the adhesive is supplied to two locations 180 degrees apart in the circumferential direction of the adhesive reservoir 62. This is not essential, and the number and supply position of these are necessary to secure the amount of adhesive supplied to keep the pressure of the adhesive in the entire area of the adhesive reservoir 62 at an appropriate pressure. Any number and supply position may be used. The appropriate pressure of the adhesive is determined by the size and number of the discharge holes 64, the arrangement of the discharge holes 64, and the like.

The adhesive of the adhesive collecting portion 62 is discharged above the coating table 60 from each discharge hole 64. As the pressure of the adhesive in the adhesive pool 62 is maintained at a predetermined value and the adhesive has a predetermined viscosity, the adhesive discharged to the outside from each discharge hole 64 is as shown in FIG. In addition, a raised upper portion N that rises in a substantially hemispherical shape is always formed above the upper surface 61 of the upper block 58. Since the height of the raised portion N is slightly larger than the step α, the coating table 60 is in the ascending position (transfer position), and the hoop material F descends to a position where the lower surface of the hoop material F contacts the upper surface 47 of the die plate 40. At this time, the upper portion N of the adhesive in each discharge hole 64 comes into contact with the lower surface of the hoop material F, and the adhesive is transferred in a round dot shape to each application point E.

When the adhesive application device 50 intermittently forms the ridge N, the ridge F is positioned at a position where the lower surface of the hoop material F contacts the upper surface 47 of the die plate 40. By setting the timing so that N is formed, the adhesive is transferred in a round dot shape to each coating point E in a state where the lower surface of the hoop material F is in contact with the upper surface 47 of the die plate 40.

The transfer amount of the adhesive to each coating point E can be controlled by the size (volume) of the step α and the ridge N. Since the size of the raised portion N is quantitatively determined by the pressure of the adhesive in the adhesive collecting portion 62, the viscosity of the adhesive, the inner diameter of the discharge hole 64, etc., the optimum setting of these specifications is applied to each coating point E. The transfer amount of the adhesive can be set to the optimum value.

In the application of the transfer type adhesive using such a discharge hole 64, the minimum pitch of the coating point E is set to a dimension slightly larger than the inner diameter of the discharge hole 64 by reducing the pitch of the adjacent discharge holes 64. can do. As a result, even if the teeth portion C is small, the coating points E can be set at a plurality of locations of the teeth portion C. This contributes to improving the adhesive strength of the teeth portion C in the laminated adhesion of the plurality of iron core thin plates W.

When the coating table 60 is in the descending position (non-transfer position), the upper surface 61 of the upper block 58 is located below the upper surface 47 of the die plate 40 with a large step exceeding the step α, so that the specified size is specified. The ridge N of the adhesive does not come into contact with the lower surface of the hoop material F, and the adhesive is not transferred to the lower surface of the hoop material F. Therefore, the coating table 60 may be moved to the descending position at the time of weighing for setting the number of laminated iron core thin plates W.

A knockout 26 is attached to the upper holder 12 as shown in FIGS. 8A and 8B. Note that FIG. 8A shows the internal punching station II on behalf of each punching station, and FIG. 8B shows the adhesive coating station IV.

The knockout 26 is provided in the lower end 26A abutting on the upper part of the stripper main body 30, the shaft portion 26C movably fitted in the through hole 13 formed in the upper holder 12, and the spring chamber 15 formed in the upper holder 12. It has an upper end flange 26B and is located. The upper part of the spring chamber 15 is closed by the plug 17 fixed to the upper holder 12. A stripper spring (knockout spring) 29 using a compression coil spring is provided between the plug 17 and the upper end flange 26B. The stripper spring 29 urges the knockout 26 downward.

The lowest descent position (bottom dead center position) of the upper holder 12 is at the bottom dead center of the upper ram (not shown) of the press machine, as shown in FIGS. 12A and 12B, on both the left and right sides of the lower holder 14. It is determined by the lower surface of the upper holder 12 coming into contact with the upper surface of the stopper 82 provided on the above. When the upper holder 12 is in the most lowered position, the stripper plate 32 comes into contact with the hoop material F, and the hoop material F is displaced with respect to the upper holder 12 with compression deformation of the stripper spring 29. It is pressed against the upper surface 47 of the die plate 40.

The vertical relative displacement stroke of the stripper 28 with respect to the upper holder 12 is larger than the approach stroke of the punches 20, 22, and 24 with respect to the dies 42, 44, 46. As shown in FIG. 12A, the approach stroke is the amount of approach in which the punches 20, 22, and 24 have entered the dies 42, 44, and 46 in the state where the upper holder 12 is in the lowest position. It is a corresponding stroke.

That is, in the stripper 28 including the stripper plate 32, the stripper 28 moves relative to the upper holder 12 with the most lowered position with respect to the upper holder 12 and the elastic deformation of the stripper spring 29, and the hoop material F is moved to the lower holder. The stroke between the position of the 14 die plate 40 pressed against the upper surface 47 is larger than the maximum approach stroke at which the punches 20, 22, and 24 enter the respective dies 42, 44, 46.

With this stroke setting, the stripper 28 rises together with the upper holder 12 after the punches 20, 22, and 24 have escaped from the dies 42, 44, 46 and the hoop material F in the ascending process of the upper holder 12 after punching. , The holding of the hoop material F by the stripper 28 is released. As a result, the hoop material F is maintained in a state of being pressed against the upper surface 47 of the die plate 40 by the stripper 28 until the punches 20, 22 and 24 are pulled out of the dies 42, 44 and 46.

As shown in FIG. 8A, each station II to VII except the pilot hole punching station I is provided with a pilot pin 84 that can enter the pilot hole P of the hoop material F in each station II to VII. .. The pilot pin 84 provided in the adhesive application station IV is not shown in FIG. 8B.

Each pilot pin 84 has an upper end flange 84A, a straight shaft portion 84B, and a lower end tapered shaft portion 84C in order in the axial direction. Each pilot pin 84 can slide up and down through the through hole 88 formed in the backing plate 16 and the punch plate 18 and the through hole 90 formed in the stripper 28, which is inserted into the mounting hole 86 formed in the upper holder 12. In addition to the lower end tapered shaft portion 84C, the lower side of the straight shaft portion 84B protrudes downward from the lower surface 33 of the stripper plate 32 at the lowest position with respect to the upper holder.

With this setting, in the descent process of the upper holder 12, the straight shaft portion 84B of each pilot pin 84 enters the corresponding pilot hole P before the lower surface 33 of the stripper plate 32 abuts on the hoop material F, and the hoop material F Positioning is performed in the direction orthogonal to the progressive direction of the hoop material F, that is, in the left-right direction on the progressive direction and the upper surface 47 of the die plate 40.

The lowermost position (lower limit position) of each pilot pin 84 is set by abutting the lower surface of the upper end flange 84A on the upper surface of the backing plate 16 forming the bottom surface of the mounting hole 86, and the upper holder for closing the upper portion of the mounting hole 86. It is urged downward by the spring force of the compression coil spring 94 provided between the plug 92 fixed to 12 and the upper end flange 84A. This spring urging structure is a relief structure for avoiding damage to the pilot pin 84 when the pilot pin 84 does not properly enter the pilot hole P. The die plate 40 is formed with a pin escape hole 41 into which the pilot pin 84 enters.

Next, the feed guide structure and the lift-up structure of the hoop material F will be described with reference to FIGS. 4, 8A and 8B. Transfer of the hoop material F of the thin steel plate in the direction along the intermittent transfer direction (forward feed direction) of the hoop material F onto the lower holder 14 and on the die plate 40 fixed to the lower holder 14 in the illustrated embodiment. The left and right guide members 100 that guide the vehicle are symmetrically attached. The left and right guide members 100 are strips long in the progressive direction of the hoop material F, respectively, and as shown in FIG. 4, the hoop material F except for the regions corresponding to the stations II, IV, and VI. It is provided intermittently in the forward feed direction.

As shown in FIG. 16, the left and right guide members 100 have a predetermined gap between the lower surface 102 of the horizontal wall facing the upper surface 47 of the die plate 40 at a predetermined interval T from above and the left and right end faces of the hoop material F. It has a side surface 103 with vertical walls facing each other, and the sides facing each other have a hook-shaped cross-sectional shape. The lower surface 102 and the side surface 103 of the guide member 100 and the upper surface 47 of the die plate 40 cooperate with each other to define the left and right guide grooves 104 of the inner opening having a rectangular cross-sectional shape extending in the progressive direction of the hoop material F. There is.

By allowing the left and right side edges of the hoop material F to enter the left and right guide grooves 104, each guide member 100 restricts the movement of the hoop material F in the left-right direction by the side surface 103 and is above the hoop material F by the lower surface 102. The movement to the hoop material F is restricted to guide the intermittent transfer of the hoop material F.

As a result, the hoop material F is prevented from shifting in the left-right direction and the vertical direction during the intermittent transfer of the hoop material F, and the hoop material F is applied to the adhesive application surface (lower surface) of the hoop material F when the adhesive is applied. Is restricted from moving laterally and upward from the top surface 47 of the die plate 40. As a result, the adhesive is accurately applied to the adhesive-applied surface. The hoop material F is restricted (prevented) from moving downward by being placed on the upper surface 47 of the die plate 40 or by being lifted up by the lifter pin 110 described later.

The predetermined interval T described above is larger than the total value of the lift-up amount L of the hoop material F by the lifter pin 110 described later and the plate thickness of the hoop material F. With this setting, the hoop material F does not come into contact with the lower surface 102 of the guide member 100 even when the hoop material F is lifted up by the lifter pin 110. As a result, the upper surface of the hoop material F does not slide into contact with the lower surface 102 of the guide member 100 during the intermittent transfer of the hoop material F, and the guide member 100 does not increase the frictional resistance during the intermittent transfer of the hoop material F. ..

As shown in FIG. 4, lifter pins 110 are provided on both the left and right sides of the die plate 40 at predetermined intervals in the forward feed direction of the hoop material F, respectively. The arrangement position of each lifter pin 110 overlaps with the arrangement position of each guide member 100 in a plan view.

As shown in FIGS. 8A and 8B, each lifter pin 110 can be vertically displaced in the lifter pin hole 112 formed in the die plate 40 and the lower holder 14 so as to open in the upper surface 47 of the die plate 40. The upper end side is exposed on the upper surface 47 of the die plate 40. A lifter spring 114 by a compression coil spring is provided between each lifter pin 110 and the bottom of each lifter pin hole 112. Each lifter spring 114 urges each corresponding lifter pin 110 upward.

Approximately half of the upper end surface of each lifter pin 110 is in contact with the lower surface of the hoop material F, and the other half is in contact with the stopper surface 106 formed on the guide member 100. As a result, as shown in FIGS. 8A, 8B and 16, each lifter pin 110 has a stopper on the upper end surface due to the spring tension of the lifter spring 114 when the hoop material F is not pushed down by the stripper 28. It is located at an ascending position that abuts on the surface 106, and the hoop material F is lifted up from the upper surface 47 of the die plate 40. Each lifter pin 110 descends against the spring force of each lifter spring 114 by the hoop material F as shown in FIGS. 11A, 11B and 18 when the hoop material F is pushed down by the stripper 28. , The whole sinks into each lifter pin hole 112.

As shown in FIG. 16, the lift-up amount L of the hoop material F by the lifter pin 110 is determined by the upper surface of the lifter pin 110 coming into contact with the downward stopper surface 106 of the guide member 100, and the lift-up amount L is determined. The value is set to be larger than the coating thickness (maximum thickness) of the adhesive transferred to the lower surface of the hoop material F.

Next, the operation of the manufacturing apparatus 10 according to the above configuration will be described with reference to FIGS. 8A, 8B to 15A, 15B, and 16 to 19. 8A to 15A show the operation of the internal punching station II on behalf of each punching station, and FIGS. 8B to 15B show the operation of the adhesive coating station IV. Since the operations of the pilot hole punching station I and the outer punching station VI are substantially the same as the operations of the inner punching station II, the description of their operations will be omitted.

8A and 8B show a state in which the upper ram (not shown) of the press machine is at the top dead center and is at the highest rising position (top dead center position) of the upper holder 12 as the press start state. In this press start state, the internal punch 22, the stripper 28, and the pilot pin 84 are located above the die plate 40. The hoop material F is in a floating position (lift-up state) separated from the upper surface 47 of the die plate 40 by the lifter pin 110 (see FIG. 16). In the lift-up state, the hoop material F is intermittently transferred in a predetermined amount in the forward feed direction by an intermittent feed device (not shown) without the lower surface of the hoop material sliding in contact with the upper surface 47 of the die plate 40.

When one intermittent transfer is completed, or during the intermittent transfer process, the upper holder 12 starts descending from the top dead center position as shown in FIGS. 9A and 9B. As the lower holder 12 descends, as shown in FIGS. 10A and 10B, the lower end tapered shaft portion 84C of each pilot pin 84 before the stripper 28 presses the hoop material F against the upper surface 47 of the die plate 40. Subsequently, the straight shaft portion 84B enters the pilot hole P of the hoop material F. As a result, the hoop material F is positioned in the transfer direction (forward feed direction) and in the left-right direction with respect to the manufacturing apparatus 10.

Since this positioning is performed in a state where the hoop material F is lifted up from the upper surface 47 of the die plate 40, the movement of the hoop material F for positioning with respect to the manufacturing apparatus 10 in the transfer direction and the left-right direction is performed with low frictional resistance. ..

As the lowering of the upper holder 12 further progresses, as shown in FIGS. 11A and 11B, the lower surface 33 of the stripper plate 32 abuts on the upper surface of the hoop material F (see FIG. 17), and the stripper 28 is a lifter spring. Against the spring force of 114, the hoop material F is pushed down together with the lifter pin 110 to a position where it abuts on the upper surface 47 of the die plate 40 (see FIG. 18). At this time, the stripper spring 29 is not compressed and deformed due to the comprehensive spring force setting of the stripper spring 29 and the lifter spring 114, and the stripper 28 is maintained at the lowest position with respect to the upper holder 12. do.

As the lowering of the upper holder 12 further progresses, as shown in FIGS. 12A and 12B, the upper holder 12 is lowered with respect to the stripper 28 while the stripper spring 29 is compressed and deformed, and the lower surface of the upper holder 12 is lowered. It is located at the bottom dead center that abuts on the upper surface of the stopper 82. As a result, in the internal punching station II, as shown in FIG. 12A, the hoop material F is pressed against the upper surface 47 of the die plate 40 by the spring-loaded stripper 28, and the punch for internal punching is punched. 22 enters the inner die punching die 44, and the inner IS is punched. Further, in the adhesive application station IV, when the hoop material F is pressed against the upper surface 47 of the die plate 40 by the spring-forced stripper 28, the ridge N of the adhesive discharged from each discharge hole 64 is the hoop material F. Transferred to the corresponding coating point E on the bottom surface (see FIG. 7).

In the transfer of this adhesive, the movement of the hoop material F in the left-right direction is restricted by the guide member 100, the upward movement of the hoop material F is restricted, and the hoop material F is positioned by the pilot pin 84. Therefore, even if the coating point E is small, the adhesive is transferred to each coating point E with high positional accuracy and accuracy.

Further, since the transfer of the adhesive is performed in a state where the hoop material F cannot vibrate when the lower surface of the hoop material F is pressed against the upper surface 47 of the die plate 40, the punching of the inner shape IS and the transfer of the adhesive are performed at the same time. Even if this is done, the adhesive is not transferred in a state where the hoop material F vibrates due to the punching impact in the internal punching station II, and the adhesive is accurately transferred to each coating point E. Also with this, even if the coating point E is small, the adhesive is transferred to each coating point E with high positional accuracy and accuracy.

When the punching of the inner shape IS and the transfer of the adhesive are completed, the upper holder 12 starts to rise from the bottom dead center as shown in FIGS. 13A and 13B. When the upper holder 12 rises from the bottom dead center, first, the inner punching punch 22 is pulled out upward from the inner punching die 44. As described above, the above-mentioned stroke in which the stripper 28 moves relative to the upper holder 12 is larger than the maximum approach stroke in which the inner punching punch 22 enters the inner punching die 44, so that the inner punching punch 22 The hoop material F is maintained in a state of being pressed against the upper surface 47 of the die plate 40 by the stripper 28 until the hoop material F comes out of the inner punching die 44.

As a result, even if vibration occurs due to friction when the inner punching punch 22 comes out of the punching opening of the inner punching die 44 and the hoop material F, the vibration is transmitted to the hoop material F of the adhesive application station IV. The transfer shape of the adhesive transferred to the coating point E of the hoop material F does not collapse or scatter.

As the upper holder 12 rises, as shown in FIGS. 14A and 14B, the stripper 28 rises together with the upper holder 12, each lifter pin 110 rises due to the spring force of the lifter spring 114, and the hoop material F Is lifted. When each lifter pin 110 comes into contact with the stopper surface 106, the hoop material F returns to a floating position (lift-up state) away from the upper surface 47 of the die plate 40.

As shown in FIG. 19, the rise of the hoop material F is prevented by the guide member 100 from shifting the hoop material F in the left-right direction, and the stripper 28 abuts on the upper surface of the hoop material F and the lifter pin. Since the hoop material F is in contact with the lower surface of the hoop material F and the hoop material F is supported from above and below by the stripper 28 and the lifter pin 110, the hoop material F is suppressed from swinging in the ascending process. As a result, in the ascending process (lift-up process) of the hoop material F, the transfer shape of the adhesive transferred to the coating point E of the hoop material F is suppressed from being distorted or scattered.

As the upper holder 12 rises further, the pilot pin 84 exits upward from the pilot hole P, as shown in FIGS. 15A and 15B, after which the upper holder 12 is shown in FIGS. 8A and 8B. Return to the top dead center position. Intermittent transfer of the hoop material F is started when the pilot pin 84 comes out of the pilot hole P. Since this intermittent transfer is performed in a state where the hoop material F is lifted up by the lifter pin 110 and the lower surface is separated from the upper surface 47 of the die plate 40 by the lift-up amount L (see FIG. 16), the lower surface of the hoop material F is applied. The adhesive transferred to the point E is not rubbed by the upper surface 47 of the die plate 40.

This intermittent transfer is performed in a state where the hoop material F is restricted from moving upward by the guide member 100 and the hoop material F is restricted from shifting in the left-right direction. Therefore, in the process of transferring the hoop material F, the hoop material F is transferred. The transferred shape of the adhesive transferred to the coating point E of the hoop material F does not collapse or scatter. The intermittent transfer is completed before the next punching process is started.

As a result, the adhesive is accurately applied to the adhesive-coated surface of the iron core thin plate W, and the adhesive applied to the adhesive-coated surface of the iron core thin plate W diffuses around and the transfer shape collapses. High-quality laminated cores can be stably produced even with small laminated cores without scattering or scattering.

As another embodiment, as shown in FIG. 20, the pilot hole P may be formed at a position corresponding to directly below the pilot pin guide hole 108 formed through the guide member 100. In this case, the pilot pin 84 is inserted into the pilot hole P with high accuracy while suppressing the fluttering of the hoop material F. Further, since the pilot pin 84 (see FIG. 8A) penetrates the pilot pin guide hole 108 and enters the pilot hole P, the positioning accuracy of the hoop material F by the pilot pin 84 is improved.

Next, another embodiment of the laminated iron core manufacturing apparatus 10 will be described with reference to FIGS. 21, 22A and 22B. In FIGS. 21, 21A and 21B, the parts corresponding to FIGS. 4, 8A and 8B are designated by the same reference numerals as those attached to FIGS. 4, 8A and 8B, and the description thereof will be omitted. do.

In the present embodiment, as shown in FIG. 21, the guide member 100 is omitted, and the lifter pin 120 also serves as a guide member for the hoop material F. The lifter pins 120 are provided on the left and right sides of the die plate 40 at predetermined intervals in the forward feed direction of the hoop material F, respectively.

As shown in FIGS. 22A and 22B, each lifter pin 120 can be vertically displaced in the lifter pin hole 122 formed in the die plate 40 and the lower holder 14 so as to open in the upper surface 47 of the die plate 40. The upper end side is provided and protrudes on the upper surface 47 of the die plate 40. A lifter spring 124 using a compression coil spring is provided between each lifter pin 120 and the bottom of each lifter pin hole 122. Each lifter spring 124 urges each corresponding lifter pin 110 upward. When the hoop material F is not pushed down by the stripper 28, each lifter pin 120 has a stepped portion 120A on the shoulder portion 116 provided at the joint between the die plate 40 and the lower holder 14 due to the spring tension of the lifter spring 124. It is located in the ascending position where it abuts, and when the hoop material F is pushed down by the stripper 28, it is located in the descending position where the hoop material F descends against the spring force of each lifter spring 114.

Each lifter pin 120 has a peripheral groove 126 on the outer periphery of a portion protruding above the upper surface 47 of the die plate 40. Each peripheral groove 126 has a rectangular cross-sectional shape similar to the guide groove 104 of the above-described embodiment, and the left and right side edges of the hoop material F enter the peripheral groove 126, so that the hoop material F is in the ascending position. Is lifted up from the upper surface 47 of the die plate 40, and the hoop material F is placed on the upper surface 47 of the die plate 40 at the descending position. Further, by inserting the left and right side edges of the hoop material F into the peripheral grooves 126 of the left and right lifter pins 120, each lifter pin 120 limits the movement of the hoop material F in the left-right direction and guides the intermittent transfer of the hoop material F. At the same time, in addition to restricting the upward movement of the hoop material F during lift-up, the hoop material F is restricted from moving downward.

This limits the hoop material F from shifting in the left-right direction and the hoop material F from moving upward and downward when the hoop material F is intermittently transferred and when the adhesive is applied to the adhesive-coated surface. This prevents the hoop material F from fluttering, and the adhesive is accurately applied to the adhesive-coated surface.

Since the present embodiment is substantially the same as the above-described embodiment except for the lift-up structure of the hoop material F by the above-mentioned lifter pin 120, the effects of the above-mentioned embodiment can be obtained also in this embodiment.

In the present embodiment, the lifter pin 120 also serves as a guide member for the hoop material F, so that the number of parts can be reduced.

Other embodiments of the laminated iron core manufacturing apparatus according to the present invention include the following.

(1) An apparatus for manufacturing a laminated iron core obtained by laminating and adhering an iron core thin plate formed by punching a strip-shaped thin steel plate into a predetermined shape, and is attached to an upper holder and a lower holder, and to the upper holder and the lower holder, respectively. A plurality of punches and dies that sequentially punch out the iron core thin plate from the strip-shaped thin steel plate that is provided and intermittently transferred, and are provided on the upper holder and formed on the strip-shaped thin steel plate to position the strip-shaped thin steel plate at each transfer position. The adhesive is applied to the adhesive-applied surface of the portion of the strip-shaped thin steel plate corresponding to the iron core thin plate, which is provided on at least one of the pilot pin inserted into the pilot hole and the upper holder and the lower holder. It has an adhesive coating device.

(2) An apparatus for manufacturing a laminated iron core obtained by laminating and adhering an iron core thin plate formed by punching a strip-shaped thin steel plate into a predetermined shape, and is attached to an upper holder and a lower holder, and to the upper holder and the lower holder, respectively. A plurality of punches and dies for sequentially punching an iron core thin plate from a strip-shaped thin steel plate that is provided and intermittently transferred, and a stripper plate that is provided on the upper holder so as to be vertically displaceable and has a lower surface facing the upper surface of the die. It has an adhesive application device provided on at least one of the upper holder and the lower holder, and which applies an adhesive to an adhesive-applied surface of a portion of the strip-shaped thin steel plate corresponding to the iron core thin plate. In this case, the apparatus for manufacturing the laminated iron core further has a stripper spring for urging the stripper plate toward the lower holder, and the stripper plate has the lower surface of the stripper plate thinned by the spring force of the stripper spring. The steel plate may be configured to be pressed against the upper surface of the die. Further, the stripper plate may be configured such that the lower surface of the stripper plate presses the strip-shaped thin steel plate against the upper surface of the die until the punch comes out of the die.

(3) An apparatus for manufacturing a laminated iron core obtained by laminating and adhering an iron core thin plate formed by punching a strip-shaped thin steel plate into a predetermined shape, and is attached to an upper holder and a lower holder, and to the upper holder and the lower holder, respectively. A plurality of punches and dies that sequentially punch out the iron core thin plate from the strip-shaped thin steel plate that is provided and intermittently transferred, and the strip-shaped thin plate that is provided on the lower holder so as to be vertically displaceable and abuts on the lower surface of the strip-shaped thin steel plate. A plurality of lifters for separating the steel plate from the upper surface of the die, and an adhesive-coated surface of a portion of the strip-shaped thin steel plate corresponding to the iron core thin plate provided on at least one of the upper holder and the lower holder. It has an adhesive application device for applying an adhesive to the steel sheet. In this case, when the stripper plate is raised, the strip-shaped thin steel plates are supported from above and below by the stripper plates and the lifters, and the strip-shaped thin steel plates are directed upward so as to be separated from the upper surface of the die. It may further have a plurality of lifting springs to be urged.

The present invention has been described above with respect to preferred embodiments thereof, but as can be easily understood by those skilled in the art, the present invention is not limited to such embodiments and deviates from the gist of the present invention. It can be changed as appropriate to the extent that it does not.

For example, the coating table 60 for the adhesive (adhesive first liquid) may be one that repeats lowering and ascending in synchronization with the pressing operation, in addition to the one that lowers only at the time of weighing. The curing accelerator or the initiator (adhesive second liquid) may be continuously applied, or may be applied only when the hoop material F is stopped. Further, the curing accelerator or the initiator (adhesive second liquid) may be applied to the entire hoop material F or partially. Further, a plurality of adhesive pools 62 may be provided, and the adhesive may be supplied from each adhesive pool 62 to the discharge holes 64 for each area. The supply of the adhesive to the adhesive reservoir 62 may be continuous or intermittent in synchronization with the pressing operation. The application of the adhesive is not limited to transfer, and may be jet application by a jet method. The adhesive may be applied to the hoop material F on the upper surface or both the lower surface surface and the upper surface surface of the hoop material F. The coating shape of the adhesive is not limited to the round dot shape, and may be an annular shape, a triangular shape, a square shape, an irregular shape, or the like.

Depending on the type of laminated iron core, internal punching is not required. In this case, internal punching may be omitted. Also, the pilot pin 84 is not essential. The planar shape of the laminated iron core includes a square shape, a T shape, a U shape, and the like, in addition to the annular shape and the circular shape.

It is not essential that the hoop material F be pressed against the upper surfaces of the die plates 40, 44, 42, 46 and the coating table 60 by the stripper plate 32, until the punches 22, 24 come out of the die 44, 46. The hoop material F may be limited to the vertical displacement of the hoop material F between the die plate 40, the dies 44, 46 and the upper surface of the coating table 60.

The arrangement of the stripper plate 32 and the lifter pin 110 may be such that the hoop material F is vertically overlapped with each other so as to sandwich the hoop material F from above and below, in addition to the arrangement of the stripper plate 32 and the lifter pin 110 being offset in the left-right direction and not overlapping with each other in a plan view. The lifter pin 110 may be arranged at an intermediate portion in the left-right direction of the hoop material F.

The adhesive application by the adhesive application device 50 is preferably immediately before the outer diameter punching step in view of shortening the transport distance of the hoop material F after the adhesive application, but is not necessarily immediately before the outer diameter punching process. You may. The heating process and the rotary laminating process are not essential.

In addition, not all of the components shown in the above embodiments are indispensable, and they can be appropriately selected as long as they do not deviate from the gist of the present invention. For example, the pilot pin, guide member, stripper structure are not essential and may be omitted.

10: Manufacturing equipment 12: Upper holder 13: Through hole 14: Lower holder 15: Spring chamber 16: Backing plate 17: Plug 18: Punch plate 20: Pilot hole punching punch 22: Inner shape punching punch 24: External punching Punch 26: Knockout 26A: Lower end 26B: Upper end flange 26C: Shaft 28: Stripper 29: Stripper spring 30: Stripper body 32: Stripper plate 33: Bottom surface 34: Punch insertion hole 36: Punch insertion hole 38: Punch insertion hole 40: Die plate 41: Pin escape hole 42: Pilot hole punching die 44: Internal punching die 46: External punching die 47: Top surface 48: Discharge hole 50: Adhesive coating device 52: Cam mechanism 54: Drive device 56: Holding hole 58: Upper block 59: Lower block 60: Coating table 61: Upper surface 62: Adhesive pool 64: Discharge hole 66: Internal block 68: Adhesive supply passage 70: Adhesive supply tube 72: Adhesive supply Device 74: Fixed cam 74A: Sawtooth ridge 74B: Sawtooth valley 76: Moving cam 76A: Sawtooth ridge 76B: Sawtooth valley 82: Stopper 84: Pilot pin 84A: Upper end flange 84B: Straight shaft 84C: Lower end tapered shaft Part 86: Mounting hole 88: Through hole 90: Through hole 92: Plug 94: Compression coil spring 100: Guide member 102: Bottom surface 103: Side surface 104: Guide groove 106: Stopper surface 108: Pilot pin guide hole 110: Lifter pin 112: Lifter pin hole 114: Lifter spring 116: Shoulder 120: Lifter pin 120A: Stepped portion 122: Lifter pin hole 124: Lifter spring 126: Circumferential groove I: Pilot hole punching station II: Internal punching station III: Idle station IV: Adhesive Agent application station V: Idle station VI: External punching station VII: Idle station T: Predetermined interval L: Lift-up amount A: Iron core thin plate W: Iron core thin plate M: Laminated iron core F: Hoop material (belt-shaped thin steel plate)
E: Coating point E1: Coating point E2: Coating point G: Iron core thin plate group

Claims (12)

A laminated iron core manufacturing device made by laminating and adhering iron core thin plates punched and formed into a predetermined shape from a strip-shaped thin steel plate.
Upper holder and lower holder,
An adhesive application device that is provided on at least one of the upper holder and the lower holder and is intermittently transferred to apply an adhesive to the adhesive application surface of the portion corresponding to the iron core thin plate of the strip-shaped thin steel plate.
Left and right guide members provided on the lower holder to guide the transfer of the strip-shaped thin steel plate along the intermittent transfer direction of the strip-shaped thin steel plate and to restrict the upward movement of the strip-shaped thin steel plate.
A pilot pin provided in the upper holder and inserted into a pilot hole formed in the strip-shaped thin steel plate in order to position the strip-shaped thin steel plate at an adhesive application position by the adhesive coating device.
The die plate provided on the lower holder and
The strip-shaped thin steel plate, which is provided on the upper holder so as to be displaceable in the vertical direction and has a lower surface facing the upper surface of the die plate and is located at the adhesive application position by the adhesive application device, is pressed against the upper surface of the die plate. A device for manufacturing a laminated iron core having a stripper plate. It further has a stripper spring that urges the stripper plate towards the lower holder.
The apparatus for manufacturing a laminated iron core according to claim 1, wherein the stripper plate is configured to press the strip-shaped thin steel plate against the upper surface of the die plate by the spring force of the stripper spring. The pilot pin includes a straight shaft portion, and the straight shaft portion projects downward from the lower surface of the stripper plate in a state where the stripper plate is in the most lowered position with respect to the upper holder due to the bias of the stripper spring. The apparatus for manufacturing a laminated iron core according to claim 2 at a position. Claims 1 to 3 further provided on the lower holder so as to be displaceable in the vertical direction, and further have a plurality of lifters for contacting the lower surface of the strip-shaped thin steel plate and separating the strip-shaped thin steel plate from the upper surface of the die plate. The apparatus for manufacturing a laminated steel core according to any one of the above items. In order to separate the strip-shaped thin steel plate from the upper surface of the die plate in a state where the stripper plate is in contact with the upper surface of the strip-shaped thin steel plate and each lifter is in contact with the lower surface of the strip-shaped thin steel plate when the stripper plate is raised. The apparatus for manufacturing a laminated steel core according to claim 4, further comprising a plurality of lifter springs for urging each lifter upward. The apparatus for manufacturing a laminated iron core according to claim 4 or 5, wherein each lifter also serves as a guide member. The guide member faces the upper surface of the die plate at a first predetermined interval from above, and restricts the upward movement of the strip-shaped thin steel plate, and the upper surface of the die plate is first from above. The apparatus for manufacturing a laminated iron core according to claim 5, further comprising a downward stopper surface that faces each other at a second predetermined interval smaller than a predetermined interval and that the upper surface of each lifter abuts. The adhesive coating device is a transfer type including a plurality of ejection holes for discharging the adhesive toward the adhesive coating surface in order to transfer the adhesive to each of a plurality of predetermined positions on the adhesive coating surface. The apparatus for manufacturing a laminated iron core according to any one of claims 1 to 7. The adhesive application device is
An adhesive supply device that supplies the adhesive to each of the discharge holes with a predetermined pressure,
An advancing / retreating driving device in which each of the discharge holes retracts the adhesive from the transfer position where the adhesive can be transferred to the adhesive-coated surface and moves the adhesive between the non-transfer positions where the adhesive cannot be transferred. The apparatus for manufacturing a laminated iron core according to claim 8. A method for manufacturing a laminated iron core, which is formed by laminating and adhering an iron core thin plate formed by punching a strip-shaped thin steel plate into a predetermined shape using a press device having an upper holder and a lower holder.
The left and right guide members provided on the lower holder limit the upward movement of the strip-shaped thin steel plate, and when the upper holder is raised, the lower holder is provided up and down and is upwardly provided by the lifter spring. The strip-shaped thin steel plate is lifted up away from the upper surface of the die plate provided on the lower holder by the lifter urged toward, and guides the transfer along the intermittent transfer direction of the strip-shaped thin steel plate. In the transfer step of intermittently transferring the strip-shaped thin steel plate in the state of being
A coating step of applying an adhesive to the adhesive-coated surface of the strip-shaped thin steel plate by an adhesive coating device provided on at least one of the upper holder and the lower holder.
A pilot insertion step of inserting a pilot pin provided in the upper holder into a pilot hole formed in the strip-shaped thin steel plate during the descent of the upper holder after the completion of the transfer step.
The pilot insertion step is carried out by a stripper plate provided on the upper holder so as to be displaceable in the vertical direction and having a lower surface facing the upper surface of the die plate and urged toward the lower holder by a stripper spring. During the descent of the upper holder after completion, the strip-shaped thin steel plate is pressed against the upper surface of the die plate provided on the lower holder with the descent movement of the lifter.
In the coating step, the pilot pin is inserted into the pilot hole, and the strip-shaped thin steel plate is pressed or pressed against the upper surface of the die plate by the stripper plate with the descent movement of the lifter. When the agent is applied and the upper holder is raised after the application of the adhesive is completed, the lifter comes into contact with the lower surface of the strip-shaped thin steel plate with the ascending movement of the lifter, and the stripper plate is attached to the strip-shaped thin steel plate. A method for manufacturing a laminated iron core that returns the strip-shaped thin steel plate to the lift-up state in a state of being in contact with the upper surface. In the coating step, the adhesive is discharged from each of the plurality of ejection holes toward the adhesive coating surface, and the adhesive is transferred to each of the coating points set at the plurality of predetermined positions on the adhesive coating surface. The method for manufacturing a laminated iron core according to claim 10, which comprises a step of performing. The method for manufacturing a laminated iron core according to claim 11, wherein the iron core thin plate includes a plurality of teeth portions and has at least one coating point on the teeth portions.

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