Punching device and lifting platform

Abstract

The present application provides a kind of blanking device, can simplify configuration.It is equipped with adhesive application platform (15), blanking platform (13) and lifting platform (17), lifting platform (17) is equipped with fixed side receiving surface (18), avoidance part (20) and lifter (29), fixed side receiving surface (18) receives the lower surface (WL) of steel plate (W) when blanking the blanking of predetermined range (R) using blanking platform (13), avoidance part (20) avoids fixed side receiving surface (18) and adhesive (G) applied to the lower surface (WL) of upstream blanking predetermined range (Ru) contact, lifter (29) protrudes relative to fixed side receiving surface (18) in a way that can retreat, by protruding and not overlapping with adhesive (G) at the position of the feeding direction of steel plate (W) support the lower surface (WL) of upstream blanking predetermined range (Ru), by retreating, steel plate (W) can be received by fixed side receiving surface (18).

Description

Technical Field

[0001] The present invention relates to a punching apparatus for punching ferrite sheets for stacked iron cores used in rotary electric motors and a lifting platform for the punching apparatus. Background Technology

[0002] As a conventional punching device, such as Patent Document 1, there exists a device that applies adhesive to a strip of steel plate using an adhesive application device, and punches and stacks iron chips from the steel plate in a die.

[0003] The blanking device has guide pins that guide the strip of steel sheet fed from the adhesive application device to the die. The guide pins support the lower surfaces of both ends of the steel sheet in the width direction. In addition, the blanking device has a retainer throughout the feed direction for holding the steel sheet integrally in the width direction from the lower surface.

[0004] In this blanking device, the steel plate is fed by pushing it to a position higher than the holder body via guide pins. At this time, the holder body holds the steel plate even if the central portion of the steel plate droops in the width direction.

[0005] However, conventional punching devices use guide pins to push the steel plate upwards at both ends in the width direction, and use retainers to hold the steel plate hanging between the guide pins in the width direction, which makes the structure complicated.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent No. 6742492 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] The problem to be solved lies in the complex structure of the punching device.

[0011] Solution for solving the problem

[0012] The present invention provides a blanking apparatus comprising: an adhesive application table that sequentially applies adhesive to the lower surface of a plurality of predetermined blanking areas having a surrounding shape on a strip of steel sheet; a blanking table that sequentially blanks the plurality of predetermined blanking areas according to the feeding of the steel sheet and stacks a plurality of blanking sheets using the adhesive; and a lifting table disposed between the adhesive application table and the blanking table, which supports the steel sheet from the lower surface while avoiding the adhesive during feeding, and keeps an upstream predetermined blanking area (i.e., an upstream predetermined blanking area) in standby mode when blanking the predetermined blanking areas using the blanking table. The aforementioned lifting platform includes: a fixed-side receiving surface that receives the lower surface of the steel plate when the aforementioned blanking table performs blanking within the predetermined range; a clearance portion that prevents the fixed-side receiving surface from contacting the adhesive applied to the lower surface of the upstream predetermined blanking range; and a lifting device that protrudes relative to the fixed-side receiving surface in a retractable manner. The lifting device supports the lower surface of the upstream predetermined blanking range at a position where it does not overlap with the adhesive in the feed direction of the steel plate, and the steel plate can be received by the fixed-side receiving surface through the retraction.

[0013] Furthermore, the present invention provides a lifting platform that, when punching a strip of steel sheet having a circular shape and an adhesive applied to its lower surface in a circular pattern within a predetermined punching range, keeps an upstream predetermined punching range (i.e., an upstream predetermined punching range) in standby mode. This lifting platform includes: a fixed-side receiving surface that receives the lower surface of the steel sheet during punching of the predetermined punching range; a clearance portion that prevents the fixed-side receiving surface from contacting the adhesive applied to the lower surface of the upstream predetermined punching range; and a lifting device that protrudes from the fixed-side receiving surface in a retractable manner. The lifting device supports the lower surface of the upstream predetermined punching range at a position where it does not overlap with the adhesive in the feed direction of the steel sheet, and the retraction allows the steel sheet to be received by the fixed-side receiving surface.

[0014] Invention Effects

[0015] The present invention simplifies the construction of the punching device. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view showing a portion of the punching apparatus according to Embodiment 1 of the present invention.

[0017] Figure 2 It means Figure 1 A schematic top view of a part of the punching device.

[0018] Figure 3 It refers to the lifting platform when the elevator is rising. Figure 2 A schematic cross-sectional view of section III-III.

[0019] Figure 4 This refers to the lifting platform when the elevator is descending. Figure 2 A schematic cross-sectional view of section III-III.

[0020] Figure 5 It refers to the lifting platform when the elevator is rising. Figure 2 A rough cross-sectional view of the VV.

[0021] Figure 6 It means Figure 1 A flowchart of the processing flow of the punching device.

[0022] Figure 7 It will be through Figure 1 A top view showing the steel sheet punched out by the punching device and the area where the adhesive is applied.

[0023] Figure 8 This is a schematic top view showing a modified example of the elevator.

[0024] Figure 9 This is a schematic top view showing other variations of the elevator.

[0025] Figure 10 This is a schematic sectional view showing another variation of the elevator.

[0026] Figure 11 This is a schematic sectional view showing another variation of the elevator. Detailed Implementation

[0027] One embodiment of the blanking apparatus 1 includes an adhesive application table 15, a blanking table 13, and a lifting table 17. The adhesive application table 15 sequentially applies adhesive G to the lower surface of a plurality of predetermined blanking ranges R having a surrounding shape on the strip steel sheet W. The blanking table 13 sequentially blanks the plurality of predetermined blanking ranges R according to the feed of the steel sheet W, and stacks a plurality of blanked sheets 2 using the adhesive G. The lifting table 17 is disposed between the adhesive application table 15 and the blanking table 13, and is supported from the lower surface WL while the steel sheet W is fed, avoiding the adhesive G. Furthermore, when the predetermined blanking ranges R are blanked using the blanking table 13, the upstream predetermined blanking range R, i.e., the upstream predetermined blanking range Ru, is kept on standby.

[0028] The lifting table 17 includes a fixed-side receiving surface 18, a clearance portion 20, and a lifting device 29. The fixed-side receiving surface 18 receives the lower surface WL of the steel plate W during blanking of a predetermined range R using the blanking table 13. The clearance portion 20 prevents the fixed-side receiving surface 18 from contacting the adhesive G applied to the lower surface WL of the upstream blanking predetermined range Ru. The lifting device 29 protrudes relative to the fixed-side receiving surface 18 in a retractable manner. This lifting device 29 supports the lower surface WL of the upstream blanking predetermined range Ru at a position where it does not overlap with the adhesive G in the feed direction of the steel plate W, and by retracting, the steel plate W can be received by the fixed-side receiving surface 18.

[0029] The lifting device 29 can be configured in a suitable form, for example, it can have a plurality of raised portions 29aa and 29ab along the feed direction that support the lower surface WL of the upstream punching predetermined range Ru, and a recessed portion 29b that avoids the adhesive G between the raised portions 29aa and 29ab.

[0030] The lifting device 29 can be positioned appropriately, for example, it can be positioned in the width direction of the steel plate W at the center of the upstream blanking predetermined range Ru. In this case, the clearance portion 20 can have a clearance recess 27 for clearance of the adhesive G on the outer side in the width direction of the lifting device 29.

[0031] The blanking predetermined range R may have an inner circumferential blanking portion 36, and the lifter 29 supports the lower surface WL of the upstream blanking predetermined range Ru in a manner that spans the inner circumferential blanking portion 36 in the feed direction.

[0032] The lifting device 29 can be longer than the diameter of the inner circumferential punching part 36 in the feed direction.

[0033] The lifting table 17 can be adjacent to the downstream of the adhesive application table 15 in the feed direction and the upstream of the punching table 13 in the feed direction.

[0034] Example

[0035] [Punching device]

[0036] Figure 1 This is a schematic cross-sectional view showing a portion of the punching apparatus according to Embodiment 1 of the present invention. Figure 2 yes Figure 1 A schematic top view of the blanking device. Additionally, in the following description, the Z direction refers to the vertical direction of the blanking device, the X direction refers to the feed direction of the strip steel sheet, and the Y direction refers to the width direction of the steel sheet.

[0037] like Figure 1 and Figure 2As shown, in the blanking device 1, a strip of steel plate W is fed along the X direction, and the iron chip 2 is blanked. In this embodiment, the steel plate W is an electromagnetic steel plate. The iron chip 2 is an annular plate, and multiple layers are stacked to form the stator 4 of a rotary motor. In addition, the blanking device 1 can also blank the iron chips of a circular plate rotor used for the rotor of a rotary motor.

[0038] The blanking apparatus 1 of this embodiment includes an inner peripheral blanking table 11, an outer peripheral blanking table 13, an adhesive application table 15, and a lifting table 17. The adhesive application table 15 and the lifting table 17 are arranged sequentially along the X direction between the inner peripheral blanking table 11 and the outer peripheral blanking table 13.

[0039] That is, the lifting platform 17 is disposed between the adhesive application table 15 and the outer peripheral punching table 13, which is the punching table in this embodiment, and is adjacent to the downstream of the adhesive application table 15 in the X direction and the upstream of the outer peripheral punching table 13 in the X direction. Alternatively, the inner peripheral punching table 13 and the groove 35 (described later) may be disposed between the lifting platform 17 and the adhesive application table 15. Figure 7 Shape cutting table, etc. In addition, when the shape cutting table is arranged downstream of the adhesive application table 15, the shape cutting table can also be used as the lifting table 17.

[0040] The inner circumferential blanking table 11 forms the groove 35 of the iron chip 2 through inner circumferential blanking. It should be noted that the groove 35 is pre-cut into a closed planar shape using a shape blanking table, and then formed by inner circumferential blanking on the inner circumferential blanking table 11, which opens the inner circumferential side. The outer circumferential blanking table 13 sequentially blanks multiple predetermined blanking ranges R according to the feed of the steel plate W, and uses an adhesive G (see reference...) Figure 7 ) Multiple iron chips are stacked.

[0041] The blanking device 1 includes an upper die 3 and a lower die 5. The upper die 3 is mounted on the press head 7, and the lower die 5 is mounted on the pad 9. The upper die 3 is shared by the inner circumferential blanking table 11 and the outer circumferential blanking table 13, and has punches 19 and 21 for the inner circumferential blanking table 11 and the outer circumferential blanking table 13. A demolding device 22 is provided at the front end of the punches 19 and 21.

[0042] The lower die 5 is equipped with lower dies 11a, 13a and 17a corresponding to the inner circumferential punching table 11, the outer circumferential punching table 13 and the lifting table 17.

[0043] The lower die 11a of the inner circumferential blanking table 11 has a punch 12, and the lower die 13a of the outer circumferential blanking table 13 has a punch 14a and an extruded part 14b connected thereto. The lower die 17a of the lifting table 17 and the lower die 13a of the outer circumferential blanking table 13 are integrated.

[0044] The upper surfaces 18 of the lower dies 13a and 17a are continuous, and the upper surface 18 forms a fixed-side receiving surface. In this embodiment, the fixed-side receiving surface is the receiving surface of the lower die 17a, which serves as the fixed side. This receiving surface is the surface on which the lifting table 17 receives the steel plate W, at least when performing peripheral punching using the peripheral punching table 13. The upper surfaces 18 of the lower dies 13a and 17a are flush, but a step may be provided between them as long as the steel plate W can be received.

[0045] The adhesive application table 15 applies adhesive to multiple pre-cut areas R of the steel plate W with a surrounding shape (see reference). Figure 7 The adhesive G is applied to the lower surface WL of the surface in a dotted pattern. Dotted application means that the adhesive G is applied in a circular pattern with intervals when viewed from above. However, as long as there are intervals between the applied adhesive Gs, the shape of the adhesive G when viewed from above is free.

[0046] The adhesive application table 15 is equipped with an adhesive application device 23. In the adhesive application device 23, at least the application portion 24 of the adhesive G is balanced between the lower die 11a of the inner circumferential punching table 11 and the lower die 17a of the lifting table 17. Although not shown, a portion of the adhesive application device 23 is located within the lower die 17a of the lifting table 17.

[0047] In the coating section 24 of the adhesive coating apparatus 23, a plurality of discharge holes 24a are arranged in a circular pattern. In this embodiment, the plurality of discharge holes 24a are arranged in a circumferential pattern at constant intervals. The discharge holes 24a deliver adhesive G stored in a container (not shown) at a predetermined pressure, thereby bringing the held adhesive G into contact with the steel plate W, thereby performing coating.

[0048] Figure 3 This indicates that the lifting platform 17 is in motion when the lifting device 29 is raised. Figure 2 A schematic cross-sectional view of section III-III. Figure 4 This indicates that the lifting platform 17 is in motion when the lifting device 29 is descending. Figure 2 A schematic cross-sectional view of section III-III. Figure 5 This indicates that the lifting platform 17 is in motion when the lifting device 29 is raised. Figure 2 A rough cross-sectional view of the VV.

[0049] like Figures 1-5As shown, the lifting table 17 is supported from the lower surface WL, avoiding the adhesive G, when feeding the steel plate W. Furthermore, when the lifting table 17 performs blanking within a predetermined range R using the outer peripheral blanking table 13, the upstream predetermined range R, i.e., the upstream blanking range Ru, is kept in standby mode. This standby mode refers to the temporary cessation of the feeding of the steel plate W, with the upstream blanking range Ru positioned on the lifting table 17. When the lifting table 17 is constructed as a shape blanking table, the state in which the upstream predetermined range Ru is located on the shape blanking table is the standby mode of the upstream predetermined range Ru.

[0050] In addition to the upper surface 18, which serves as the fixed side receiving surface, the lifting platform 17 also includes a clearance section 20 and a lifting device 29.

[0051] The clearance portion 20 is used to prevent the upper surface 18 from contacting the adhesive G applied to the lower surface WL of the upstream blanking predetermined range Ru. In this embodiment, it has multiple clearance recesses 27. The multiple clearance recesses 27 are arranged in a surrounding shape to receive the adhesive G of the upstream blanking predetermined range Ru waiting on the lifting platform 17. However, by providing the clearance recesses 27 only in the portions corresponding to the adhesive G, the clearance recesses 27 are minimized as much as possible, thereby increasing the contact area between the steel plate W and the upper surface 18 and thus stably holding the steel plate W.

[0052] Alternatively, the clearance recess 27 can be formed from a single, continuous, annular recess. Alternatively, several clearance recesses 27 can be combined to form an arc-shaped recess when viewed from above. Furthermore, the clearance recess 27 can also be a recess that, when viewed from above, is circular, rectangular, or similar, and can also accommodate the elevator 29.

[0053] In this embodiment, the clearance recess 27 is provided on the outer side in the Y direction relative to the elevator 29. On the elevator 29, the recessed strip 29b, described later, functions as the clearance portion 20.

[0054] The lifting device 29 is disposed within the receiving recess 25. The receiving recess 25 is located at the center of the lower mold 17a in the Y direction within the lifting platform 17. The receiving recess 25 is formed on the upper surface 18 of the lower mold 17a in a rectangular shape when viewed from above.

[0055] The width in the Y direction and the length in the X direction of the receiving recess 25 are set according to the elevator 29. However, the receiving recess 25 may also be formed larger than the elevator 29 in the Y direction, thus also serving as a clearance recess.

[0056] The depth of the receiving recess 25 in the Z direction is formed to be deeper than the thickness of the elevator 29 in the Z direction, which allows the upper surface of the elevator 29 to retract relative to the upper surface 18 of the lower mold 17a.

[0057] The lifting device 29 of this embodiment includes multiple raised ribs 29a and recessed ribs 29b. Two raised ribs 29aa are arranged on the central side of the lifting device 29 in the width direction (Y direction) of the electromagnetic steel plate W. Raised ribs 29ab are arranged on both edges of the lifting device 29 in the Y direction. The raised ribs 29aa on the central side of the lifting device 29 are thicker in the Y direction than the raised ribs 29ab on both sides.

[0058] With this structure, the ridge portion 29aa can support the predetermined upstream cutting range Ru from the lower surface WL at the wide intervals in the Y direction between adjacent adhesives G arranged in a circumferentially coated pattern. On the other hand, the ridge portion 29ab can support the predetermined upstream cutting range Ru from the lower surface WL at the relatively narrow intervals in the Y direction between adjacent adhesives G.

[0059] The thickness of the convex portion 29aa in the Y direction can improve the supporting rigidity of the lifting device 29 on the steel plate W. Furthermore, by minimizing the height of the convex portions 29aa and 29ab in the Z direction, the supporting rigidity of the lifting device 29 on the steel plate W can also be improved.

[0060] The protruding portions 29aa and 29ab are rectangular in shape and protrude along the Y-direction section, extending along the entire length of the elevator 29 in the feed direction, i.e., the X-direction. The upper surfaces of the protruding portions 29aa and 29ab support the lower surface WL of the upstream punching predetermined range Ru by avoiding the adhesive G applied to the steel plate W.

[0061] The predetermined cutting range R for applying adhesive G includes an inner circumferential punched portion 36 (described later) punched out using an inner circumferential punching table 11. A lifter 29 supports the lower surface WL of the upstream predetermined cutting range Ru in a manner that spans the inner circumferential punched portion 36 in the X direction. In this embodiment, the lifter 29 is formed to be larger than the diameter of the inner circumferential punched portion 36. The diameter of the inner circumferential punched portion 36 is defined by an imaginary circle passing through the bottom of a concave groove 35 when viewed from above.

[0062] Furthermore, since the lifting device 29 only needs to span the inner circumferential punched portion 36 in the X direction, it can also span between the front ends of the teeth 38. Additionally, the lifting device 29 can be positioned relative to the Y direction in this embodiment, and the number of protrusions 29aa and 29ab can be varied. For example, the lifting device 29 can have one protrusion 29aa or 29ab. In this case, the lifting device 29 can also be configured to span between multiple teeth 38 located at its ends in the Y direction in the X direction.

[0063] A recessed portion 29b is formed between adjacent protruding portions 29aa and 29ab in the Y direction. The recessed portion 29b has a width and depth that avoids the adhesive G and extends through the lifter 29 in the X direction.

[0064] The lifter 29 protrudes from the upper surface 18 in a retractable manner. In this embodiment, the lifter 29 is supported by a support column 31 at the bottom of the receiving recess 25. An elastic member 33 is mounted on the support column 31 and sandwiched between the lifter 29 and the receiving recess 25. The elastic member 33 is, for example, a coil spring.

[0065] The lifting device 29 protrudes from the upper surface 18 in a manner that allows it to retract from the upper surface 18 by the force of the elastic member 33, that is, from the upper surface 30 of the protrusions 29aa and 29ab relative to the upper surface 18. Figure 4 Coplanar states such as Figure 3 and Figure 5 That protrusion. At the protruding positions of the upper surfaces of the raised sections 29aa and 29ab relative to the upper surface 18 of the lower mold 17a, such as... Figure 3 As shown, this can prevent the adhesive G from contacting the upper surface 18.

[0066] Therefore, as Figure 3 and Figure 5 As shown, the lifter 29 rises from the lower die 17a of the lifting platform 17 to support the lower surface WL of the upstream blanking predetermined range Ru of the steel plate W, and allows the steel plate W to be fed. Through this feeding, the upstream blanking predetermined range Ru can be positioned on the die 14a of the outer peripheral blanking table 13.

[0067] Additionally, the lifting device 29 overcomes the force of the elastic member 33 by being pressed by the demolding device 22, and retracts towards the lower mold 17a of the lifting platform 17. Through this retraction, as... Figure 4 As shown, the steel plate W is lowered to the upper surface 18 of the lower die 17a and 13a of the lifting platform 17 and the outer peripheral punching table 13.

[0068] Therefore, as the upper die 3 descends while the steel sheet W is fed sequentially along the X direction, the punches 19 and 21 of the inner circumferential punching table 11 and the outer circumferential punching table 13 of the punching device 1 both descend along the Z direction. Through this descent, the ejector 22 on the upper die 3 side presses the steel sheet W in, and then the punches 19 and 21 function. In the adhesive application table 15, the adhesive application device 23 functions, and in the lifting table 17, the lifting device 29 descends against the force of the elastic member 33. Thus, the iron chip 2 is continuously punched from the strip steel sheet W and stacked sequentially.

[0069] [Functions, etc.]

[0070] Figure 6 It means Figure 1 A flowchart of the punching device process. Figure 7 It will be through Figure 1 A top view showing the steel sheet punched out by the punching device and the area where the adhesive is applied.

[0071] In the blanking device 1, the upper die 3 descends while the steel plate W is fed sequentially along the X direction, and the inner peripheral blanking table 11, the adhesive application table 15, and the outer peripheral blanking table 13 function. The lifting table 17 functions when the steel plate W is fed along the X direction, and as described above, it enables the lifting device 29 to rise and avoid the feeding of the adhesive G.

[0072] like Figure 1 , Figure 2 as well as Figure 6 As shown, in the inner circumferential punching table 7, the punch 19 is used for inner circumferential punching, as follows: Figure 7 As shown, grooves 35 and the like are formed within the predetermined blanking range R as inner peripheral blanking portions 36. The inner peripheral blanking portion 36 refers to the blanking portion within the inner periphery that also includes the grooves 35 within the predetermined blanking range R.

[0073] In the adhesive application table 15, the adhesive application process is performed. Within the predetermined circular punching range R of the incoming strip steel plate W, the adhesive is applied by the adhesive application device 23. Figure 7 The adhesive G is applied in a circular pattern. This application arranges the adhesive G in a circumferential pattern at equal intervals near the root of each tooth 38. Alternatively, the adhesive G can be applied to the tip of the tooth 38.

[0074] The plate waits on the lifting platform 17. That is, on the lifting platform 17, the predetermined blanking range R is waited as the upstream predetermined blanking range Ru. When the upstream predetermined blanking range Ru moves onto the lifting platform 17, the lifter 29 rises from the lower die 17a of the lifting platform 17 in a retractable manner. The steel plate W slides on the lifter 29. At this time, the adhesive G within the upstream predetermined blanking range Ru is avoided by the recessed portion 29b of the lifter 29.

[0075] On the other hand, the downstream blanking predetermined range R, which is waiting in advance on the lifting platform 17, is configured onto the die 14a of the outer peripheral blanking table 13 by sliding the steel plate W on the lifting device 29 of the steel plate W.

[0076] When feeding the steel plate W, if Figure 3 As shown, since the adhesive G passes between the recessed strips 29b, the steel plate W is allowed to be fed on the elevator 29.

[0077] When the downstream blanking range R is positioned on the die 14a of the outer blanking table 13 by the feeding of the steel plate W, the upper die 3 descends. At this time, corresponding to the pressing of the steel plate W by the ejector 22, the lifter 29 descends against the force of the elastic member 33.

[0078] By allowing the elevator 29 to descend, such as Figure 4As shown, the steel plate W descends onto the upper surface 18 of the lower die 17a and 13a of the lifting platform 17 and the outer peripheral punching table 13.

[0079] At this time, in the lifting platform 17, as Figure 4 As shown, the adhesive G within the upstream blanking predetermined range Ru is repositioned into the relief recess 27, and the steel plate W is received by the upper surface 18. In this state, the upstream blanking predetermined range Ru remains idle until the next feed.

[0080] In the outer peripheral blanking table 13, peripheral blanking is performed by the punch 21. That is, the predetermined blanking range R is blanked as the iron chip 2 (blank sheet), and as... Figure 1 The plates are held within the extruder 14b. Through this holding, multiple iron chips 2 are stacked while being bonded together by adhesive G. Meanwhile, the steel plate W in the adjacent lifting platform 17 is also supported by the upper surface 18, thus enabling high-precision punching.

[0081] As described above, in the blanking apparatus 1 of this embodiment, on the lifting platform 17, the upstream blanking predetermined range Ru of the steel plate W is supported by a lifting device 29 that protrudes in a retractable manner relative to the fixed side bearing surface, i.e., the upper surface 18, of the clearance portion 20 having adhesive G.

[0082] Therefore, the blanking device 1 can suppress the sagging of the upstream blanking predetermined range Ru. Thus, it is unnecessary to provide a special component on the blanking device 1 to receive the upstream blanking predetermined range Ru coated with adhesive G, simplifying the structure of the blanking device 1. Furthermore, since the lifting device 29 protrudes from the upper surface 18 of the lower die 17a in a retractable manner, the structure of the blanking device 1 can be further simplified. When blanking using the outer peripheral blanking table 13, the upper surface 18 of the adjacent lifting table 17 can be used to avoid the adhesive G and reliably receive the steel plate W, improving blanking accuracy.

[0083] Furthermore, in this embodiment, the lifter 29 supports the adhesive G near the center of a predetermined punching range R with a relatively wide spacing in the Y direction. Therefore, even if the adhesive G is applied evenly along the circumference, interference with the lifter 29 can be suppressed. As a result, the bonding strength between the iron chips 2 can be made uniform in the circumferential direction.

[0084] Furthermore, by supporting the area near the middle of the predetermined blanking range R with the lifter 29, the sagging of the predetermined blanking range R can be suppressed more reliably.

[0085] Furthermore, the predetermined blanking range R includes an inner circumferential blanking portion 36, and the lifter 29 supports the lower surface WL of the upstream predetermined blanking range Ru in a manner that spans the inner circumferential blanking portion 36 in the feed direction. Therefore, the blanking apparatus 1 of this embodiment can reliably support the lower surface WL and suppress sagging even within the predetermined blanking range R having the inner circumferential blanking portion 36.

[0086] The lifting device 29 is longer than the diameter of the inner circumferential punching portion 36 in the X direction. Therefore, near the center of the predetermined punching range R with the inner circumferential punching portion 36, the lifting device 29 can reliably support the lower surface WL and suppress sagging.

[0087] [Variation Example]

[0088] Figure 8 This is a schematic top view showing a modified example of the elevator. Figure 9 This is a schematic top view showing other variations of the elevator. Furthermore, the basic structure of these variations is the same as the embodiments described above; the same reference numerals are used to indicate the structures of variations that are the same as or correspond to the embodiments, and repeated descriptions are omitted.

[0089] exist Figure 8 In a modified example, when viewed from above, the two ends 29c of the elevator 29 in the X direction are convex arcs protruding outwards in the X direction. Correspondingly, the two ends of the receiving recess 25 of the lower mold 17a in the X direction are also convex arcs when viewed from above. However, the two ends of the receiving recess 25 in the X direction do not necessarily need to be convex arcs; any shape that allows the elevator 29 to rise and fall is acceptable.

[0090] By using the convex arc shape in the X direction of the lifting device 29, the support range of the steel plate W can be set to be relatively longer compared with a rectangular lifting device 29.

[0091] exist Figure 9 In a modified example, the two ends 29c of the lifting device 29 and the receiving recess 25 in the X direction are set as concave arcs that are recessed inward in the X direction when viewed from above. However, the two ends of the receiving recess 25 in the X direction of the lower mold 17a do not necessarily need to be set as concave arcs.

[0092] The concave arc shape of the elevator 29 in the X direction can avoid interference with upstream and downstream components in the X direction, or eliminate the need for additional components to retract.

[0093] Alternatively, instead of the convex or concave arc shape of both ends 29c of the lifting device 29, one end in the X direction can be configured as a convex or concave arc shape. In this case, the other end of the lifting device 29 can be configured as a straight line in the same way as in Embodiment 1. Alternatively, one end of the lifting device 29 in the X direction can be configured as a convex arc shape, and the other end as a concave arc shape.

[0094] Alternatively, a slope extending across the upper surface can be set at the upstream end of the elevator 29 in the X direction. In this case, it can also be configured such that, during the feeding of the steel plate W, the upstream end of the elevator 29 in the X direction does not interfere with the groove 35 punched within the predetermined punching range R.

[0095] Figure 10 This is a schematic sectional view showing another variation of the elevator. Figure 11 This is a schematic sectional view showing another variation of the elevator. Furthermore, the basic structure of this variation is the same as the embodiment described above; the same reference numerals are used to denote the structures of the same or corresponding variations, and repeated descriptions are omitted.

[0096] Figure 10 In a modified example, the Y-direction side surfaces of the convex portions 29aa and 29ab of the elevator 29 are formed into a stepped shape in which the width in the Y-direction gradually decreases toward the front end in the Z-direction. Figure 11 In a modified example, the roots of the two sides of the convex portions 29aa and 29ab in the Y direction of the elevator 29 are provided with an inclination that gradually decreases in width from the Y direction to the front end in the Z direction.

[0097] In addition, Figure 10 and Figure 11 In the middle, a raised strip 29ab is omitted.

[0098] In this modified example, the front end 30 in the Z direction of the protrusions 29aa and 29ab can reduce the width in the Y direction according to the size of the adhesive G in the Y direction. Moreover, it can maintain the supporting rigidity of the protrusions 29aa and 29ab as well as the lifting device 29 as a whole.

[0099] Symbol Explanation

[0100] 2—Iron chip (punching sheet), 13—Outer peripheral punching table (punching table), 15—Adhesive application table, 17—Lifting table, 20—Allowing part, 23—Adhesive application device, 27—Allowing recess, 29—Lifter, 29a—Protruding part, 29b—Concave part, 36—Inner peripheral punching part, G—Adhesive, R—Preset punching range, Ru—Upstream punching range, W—Steel plate.

Claims

1. A punching device, characterized in that, have: An adhesive application table sequentially applies adhesive to the lower surface of a strip of steel plate with a circular shape and multiple predetermined punching ranges. A blanking table that sequentially blanks the plurality of predetermined blanking ranges according to the feed of the aforementioned steel plates, and stacks the plurality of blanking sheets using the aforementioned adhesive; and A lifting platform, disposed between the adhesive application platform and the punching platform, avoids the adhesive and is supported from the lower surface when the steel plate is fed, and when punching within the predetermined range is performed using the punching platform, a predetermined range upstream of the predetermined range, i.e., the upstream predetermined range, is kept on standby. The above-mentioned lifting platform has: The fixed side bearing surface bears the lower surface of the steel plate when the above-mentioned blanking table is used to perform blanking within the predetermined range. The clearance portion prevents the fixed side bearing surface from contacting the adhesive applied to the lower surface within the predetermined range of the upstream punching. as well as The lifting device protrudes in a retractable manner relative to the aforementioned fixed-side bearing surface. The aforementioned lifting device supports the lower surface of the predetermined range of the upstream punching at a position where it does not overlap with the adhesive in the feeding direction of the steel plate by means of the aforementioned protrusion, and the steel plate can be received by the aforementioned fixed side bearing surface by means of the aforementioned retraction.

2. The punching device according to claim 1, characterized in that, The aforementioned lifting device has a plurality of raised portions along the feed direction that support the lower surface of the predetermined range of the upstream punching and recessed portions that avoid the adhesive between the raised portions.

3. The punching device according to claim 1 or 2, characterized in that, The aforementioned lifting device is positioned on the central side of the predetermined upstream punching range in the width direction of the aforementioned steel plate. The aforementioned clearance portion has a clearance recess on the outer side relative to the width direction of the aforementioned elevator to avoid the aforementioned adhesive.

4. The punching device according to claim 1 or 2, characterized in that, The aforementioned blanking pre-cut area includes an inner circumferential blanking portion. The aforementioned lifting device supports the lower surface of the predetermined range of the upstream punching section in such a way that it spans the inner circumferential punching section in the direction of the aforementioned feed.

5. The punching device according to claim 4, characterized in that, The aforementioned lifting device is longer than the diameter of the aforementioned inner circumferential punching part in the aforementioned feed direction.

6. The punching device according to claim 1 or 2, characterized in that, The aforementioned lifting platform is adjacent to the downstream of the aforementioned adhesive application platform in the aforementioned feed direction and the upstream of the aforementioned punching platform in the aforementioned feed direction.

7. A lifting platform that, when punching a strip of steel sheet having a circumferential shape and having an adhesive applied in a circumferential manner to its lower surface, keeps an upstream punching predetermined range (i.e., an upstream punching predetermined range) in standby mode, characterized in that it comprises: A fixed-side bearing surface that receives the lower surface of the steel plate during the aforementioned punching within the predetermined range; The avoidance portion prevents the aforementioned fixed-side receiving surface from contacting the adhesive applied to the aforementioned lower surface within the aforementioned upstream punching predetermined range; and The lifting device protrudes in a retractable manner relative to the aforementioned fixed-side bearing surface. The aforementioned lifting device supports the lower surface of the predetermined range of the upstream punching at a position where it does not overlap with the adhesive in the feeding direction of the steel plate by means of the aforementioned protrusion, and the steel plate can be received by the aforementioned fixed side bearing surface by means of the aforementioned retraction.

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