Shear die equipment for electrical sheet materials

Abstract

1. A shear die device (10, 10') for sheet materials for electrical applications, adapted to form laminate packs for electrical applications in electrical equipment such as motors, generators, transformers, counters, ignition coils and other electrical fixtures, comprising a box-shaped body (12, 30) housed within a plate (14) of the shear die and having means for simultaneously or selectively enabling and / or disabling shearing of a plurality of shear punches (15) of the shear die during a shearing process, the means for enabling and / or disabling shearing being provided in a number and positions corresponding to the number and positions of the shear punches (15).

Description

[Technical Field]

[0001] The present invention relates to a device for shear dies for electrical sheet materials. [Background technology]

[0002] More particularly, the present invention relates to an apparatus for applying shear dies to produce sheet metal material adapted to form laminate packs for electrical applications in electrical equipment such as motors, generators, transformers, counters, ignition coils and other electrical components.

[0003] As is known, the magnetic plates required to form the stack packs are produced from blank metal sheets that are subjected to shearing using specialized dies, which therefore comprise what are technically called "specialized functional elements", i.e. mechanical elements of the die that are actuated manually or by pneumatic or hydraulic pistons to activate and / or deactivate one or more shearing elements of the die.

[0004] The subject of the "dedicated functional member" is a laminated plate material made with a progressive die, in which each of the stacked metal plate materials has a protruding brace that forms a recess on the opposing surface (relative to the surface of the protruding brace). The protruding brace of one plate material is constrained by the recess of an adjacent plate material, and another plate material is interposed between the two adjacent plates that are constrained to each other, and this other plate material has a through hole into which the protruding brace of yet another plate material that is connected to the recess of the adjacent plate material fits. In this example, the dedicated functional member is made operable and / or inoperable with each stroke of the press.

[0005] In the progressive die for the dedicated packaging as described above, a plurality of "dedicated functional members" are provided, and the shear punches can be made operable and / or inoperative by means of making the dedicated functional members operable and / or inoperative, thereby obtaining sheared products (e.g., plate material) in a layered manner.

[0006] Typically, the enabling and / or disabling of the dedicated functional members is done by a dedicated device provided within the mechanical structure of the shear die, which comprises a travelling bar and a slider and its restraining plate, which requires a considerable amount of space and is driven by an external control and command unit via pneumatic or hydraulic pulses.

[0007] Therefore, conventional dedicated devices have serious problems such as the size and weight of the device being considerable.

[0008] Known solutions of this type are described in U.S. Pat. Nos. 4,623,089, 5,144,872 and 8,770,077, which disclose shear dies characterized by complex mechanical structures that result in considerable equipment size and weight.

[0009] Another problem with the prior art devices is that they can only operate the shear punches simultaneously during each shearing step.

[0010] Another problem with prior art devices is typified by mechanical problems in which the mechanisms that operate or move the shear punches become damaged or jammed.

[0011] Previous solutions to this type of problem are disclosed in EP 0 963 802, DE 202005 010 990, EP 3 789 133, DE 4 135 787 and US 5 771 565, which describe shearing devices comprising a plurality of punches, the movement of which is activated and / or deactivated depending on the shearing needs by mechanical means of the piston or lever type.

[0012] The consequences of the above problems are represented by the cost of maintenance and replacement or repair of damaged or jammed mechanisms, which impacts the cost of manufacturing the board. Summary of the Invention [Problem to be solved by the invention]

[0013] An object of the present invention is to solve the above-mentioned problems.

[0014] More specifically, the object of the present invention is to provide a device for a shear die for electrical sheet materials, which has small dimensions and can be easily installed on the shear die.

[0015] Another object of the present invention is to provide an apparatus which reduces, if not dramatically reduces, the likelihood that the mechanism which transmits the movement to the shear punch will experience damage or jamming.

[0016] Another object of the present invention is to provide a shear die device capable of operating a plurality of shear punches simultaneously or selectively, i.e., individually, even in one shearing process.

[0017] Another object of the present invention is to provide a shear die device which is easy to handle and reduces the associated costs in terms of maintenance, repair or replacement work.

[0018] Another object of the present invention is to provide the user with an apparatus for shear dies for electrical applications that is easy and economical to manufacture by being reliable and durable over time. [Means for solving the problem]

[0019] These and other objects are achieved according to the invention by the constructive features set forth in claim 1.

[0020] According to the present invention, there is provided an apparatus for a shear die for sheet materials for electrical applications, which is adapted to form laminate packs for electrical applications in electrical equipment such as motors, generators, transformers, counters, ignition coils and other electrical components, the apparatus comprising a box-shaped body accommodated within the plate of the shear die and having means for simultaneously or selectively enabling and / or disabling the shearing action of a plurality of shear punches of the shear die during the shearing process, the number and positions of the means for enabling and / or disabling the shearing action corresponding to the number and positions of the shear punches.

[0021] Preferred embodiments of the invention will become apparent from the dependent claims.

[0022] The structural and operational features of the apparatus for shear dies for electrical sheet materials according to the present invention will be better understood from the following detailed description, taken in conjunction with the accompanying drawings, which show embodiments provided by way of non-limiting example only. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a perspective view showing a schematic diagram of a shear die device for electrical sheet materials according to the present invention. [Figure 2] FIG. 2 shows a schematic view of a device according to the invention in cross section in a vertical plane. [Figure 3] FIG. 3 shows a schematic view of the device according to the invention in cross section in a vertical plane, illustrating different stages of operation of the device according to the invention. [Figure 4] FIG. 4 shows a schematic view of the device according to the invention in cross section in a vertical plane, illustrating another stage of operation of the device according to the invention. [Figure 5] FIG. 5 shows a schematic perspective view of an apparatus according to the invention according to an alternative embodiment to that shown in FIGS. [Figure 6] FIG. 6 shows a schematic view in vertical section of the device shown in FIG. 5, illustrating different stages of operation of the device according to the invention. [Figure 7]FIG. 7 shows a schematic view in vertical section of the device shown in FIG. 5, illustrating another stage of operation of the device according to the invention. DETAILED DESCRIPTION OF THE INVENTION

[0024] With reference to the accompanying drawings, the apparatus for shearing dies for electrical sheet materials according to the present invention is generally designated by the reference numeral 10 in Figures 1 and 2 to 4, and comprises a box-shaped body 12 adapted to be accommodated in a plate 14 of a shearing die (Figure 2) having a plurality of shear punches 15 and a plurality of contact spacer members 16. The function of the shear punches, which are movable in the forward / rearward direction according to each mode, is aimed at enabling and / or stopping specific shearing actions (referred to as "specific actions") and will be described later.

[0025] The contact spacer members 16 are provided with elastic members 16' which cooperate with the contact spacer members to provide elastic return to the shear punch 15 when it is in a shearing or non-shearing state, as will be described below.

[0026] The contact spacer members 16, and therefore the shear punches 15, are enabled or disabled to shear by an actuating member disposed within the box-shaped body 12. The box-shaped body 12 comprises an upper block 12' and a lower block 12", which are tightly and firmly held together by known holding means, such as screws.

[0027] The lower block 12" has a plurality of through holes or openings 12B formed through its base thickness to accommodate the portions of the contact spacer members 16 to which the shear punches 15 are connected. The number and arrangement of the through holes or openings 12B correspond to the number and location of the shear punches 15.

[0028] The means for enabling or disabling the shear punch 15 in shearing operation comprises sliders 18 disposed within the lower block 12" and movable within a plurality of dedicated receptacles 19 formed within the lower block 12". The plurality of sliders 18 cooperate with elastic members 20 which are also housed within each of the receptacles 19, the elastic members preferably comprising compression springs.

[0029] In the preferred embodiment shown in the accompanying drawings, the slider 18 comprises a head portion 18' and a tail portion 18" (positioned toward the elastic member 20), the head portion and the tail portion having different height dimensions, and in particular, the height dimension of the tail portion 18" is shorter than the height dimension of the head portion 18'.

[0030] The number of sliders 18, and therefore resilient members 20 and resilient member housings 19, must correspond to the number of shear punches 15 to enable or disable the shear punches as desired during the shearing process.

[0031] In the preferred embodiment shown in the accompanying drawings, the slider 18 is radially disposed so as to be able to slide back and forth relative to the center of the lower block 12''.

[0032] In alternative embodiments to those described above, slider 18 may be positioned at different radial locations depending on specific manufacturing requirements.

[0033] The sliding movement of the slider 18 in the receptacle 19 is effected by a flow of compressed air supplied through an attachment 22 fixed to the box-like body 12 and distributed to the receptacle by a distribution means 24 arranged in the box-like body 12 at its center.

[0034] Having described the construction of the device for shear dies for electrical sheet materials according to the invention, its operation will now be explained with reference to the embodiment depicted in FIGS.

[0035] 2 and 3 show the shear stroke with the shear punch 15 deactivated and not shearing.

[0036] In this state, the sliders 18 are in their rest end stroke positions in their respective receiving sections 19 at the center of the lower block 12" of the box-shaped body 12, and are maintained in that position by the action of the elastic members 20. The contact spacer members 16, and therefore the shear punches 15, rise in the thickness direction of the plate 14 of the die within the lower block 12" of the box-shaped body 12 due to the shear force of the shear die (indicated by arrow "X" in Figure 3), and come into contact with the tail portions 18" of the sliders 18, thereby coming into a shear stop against the plate material (specifically, the contact spacer members 16 engage with the tail portions 18" of the sliders 18).

[0037] FIG. 4 shows the shearing stroke in which the shear punch 15 operates to perform shearing.

[0038] To operate the shear punch 15, compressed air is supplied to the box-shaped body 12 through the attachment 22 and distributed to the individual sliders 18 through the distribution means 24. The compressed air causes the sliders 18 to slide radially away from the center of the lower block 12", compressing the elastic means 20 (indicated by arrow "Y" in FIG. 4). This sliding movement causes the sliders 18 to close the through holes or through openings 12B of the lower block 12", and the contact spacer member slides (the spacer member comes into contact with the head portion 18' of the slider 18), causing the shear punch 15 to enter the die of the shearing mold and shear the large blank to create multiple plate materials.

[0039] Next, when the shear punch 15 does not shear in the next shear stroke, the supply of compressed air to the box-shaped body is stopped, and the action of the elastic members 20 returns the individual sliders 18 to their rest positions in the center of the lower block 12″, returning the shear die device to the state shown in FIG. 2 or 3.

[0040] In the embodiment shown in FIGS. 1 to 4, when compressed air is supplied to the box-shaped body 12, the sliders are slid simultaneously by simultaneously operating the shear punches 15.

[0041] 5-7, another embodiment of a shear die apparatus according to the present invention, generally designated 10', will be described, in which a plurality of shear punches can be optionally placed in a shearing and / or non-shearing state.

[0042] In describing this alternative embodiment, the reference numerals of the embodiment shown in Figures 1 to 4 are retained to designate corresponding components.

[0043] The shear die apparatus 10' according to the present invention comprises a box-like body 30 having an upper block 30' and a lower block 30" tightly and firmly held together by known holding means, such as screws.

[0044] The lower block 30" has a plurality of through holes or openings 30B formed through its base thickness to accommodate the portions of the contact spacer members 16 to which the shear punches 15 are connected. The number and arrangement of the through holes or openings 30B correspond to the number and locations of the shear punches 15.

[0045] The means for activating and / or deactivating the shear punch 15 comprises sliders 34 arranged in the lower block 30" and movable within a plurality of dedicated receptacles 36 formed in the lower block 30". The plurality of sliders 34 cooperate with resilient members 35 also housed in the receptacles 36, the resilient members preferably consisting of compression springs.

[0046] In the embodiment shown in the accompanying drawings, the slider 34 comprises a head portion 34' and a tail portion 34" (in the direction of the elastic member 35 and the center of the lower block 30" of the box-shaped body 30), the head portion and the tail portion having different height dimensions, in particular, the height dimension of the tail portion 34" being shorter than the height dimension of the head portion 34'.

[0047] The number of sliders 34, and therefore elastic members 34 and receptacles 36 for the elastic members, must correspond to the number of shear punches 15 so that multiple shear punches can be sheared and / or inoperative as desired during the shearing process.

[0048] In the preferred embodiment shown in the accompanying drawings, the slider 34 is radially disposed so as to be able to slide back and forth relative to the center of the lower block 30''.

[0049] In alternative embodiments to those described above, the slider 34 may be positioned differently depending on the specific manufacturing requirements (the geometry of the shear punches that are subject to shear enable and / or shear disable operations).

[0050] The sliding movement of the sliders 34 within the receptacles 36 is effected by a flow of compressed air supplied to each slider 34 through an attachment 38 fixed to the box-shaped body 30 and distributed within the receptacle 36 of each slider 34.

[0051] Having described the construction of the device for shear dies for electrical sheet materials according to the invention, its operation will now be explained with reference to the embodiment shown in FIGS.

[0052] In FIG. 6, the shear punch 15 is shown deactivated on the shear stroke and not shearing.

[0053] In FIG. 7, in a single shear stroke of the shear die, not all of the shear punches are enabled for shearing at the same time, but compressed air is selectively supplied only to the attachment 38 at the location of the shear punch 15 that is to be enabled for shearing, thereby sliding only the slider 34 corresponding to the shear punch 15 that is to be enabled for shearing.

[0054] By supplying compressed air to the receiving portion 36 through the attachment 38, the corresponding slider 34 slides within the receiving portion 36 and moves toward the center of the lower block 30" to compress the elastic means 35 (indicated by arrow "Y" in FIG. 7), close the through hole or through opening 30B of the lower block 30", and the corresponding portion of the contact spacer member 16 slides, causing the corresponding shear punch 15 to enter the die of the shearing mold and punch out the large blank to produce a plurality of plate materials (indicated by arrow "X" in FIG. 7). Meanwhile, the shear punch 15 that is not enabled to shear (one without a flow of compressed air) is in a rest position in contact with the tail portion 34" of the slider 34 (indicated by arrow "X" in FIG. 7).

[0055] As can be seen from the above description, the effects achieved by the shear die device for electrical sheet materials according to the present invention are obvious.

[0056] The shear die device for manufacturing electrical sheet materials according to the present invention can be advantageously reduced in size and weight, and therefore can be easily installed in the shear die.

[0057] Another advantage of the shear die apparatus of the present invention is that it is simpler than conventional apparatus, dramatically reducing the possibility of damage or jamming of the mechanism that transmits the movement to the shear punch.

[0058] Another advantage is that the shear die device according to the present invention allows the shear punches to be driven simultaneously or selectively even during a single stroke of the shear die.

[0059] Another advantage of the shear die device according to the present invention is that it can transmit the movement motion to the shear punch without adding a new plate that can incorporate a moving bar and slider, which was necessary in conventional shear die devices.

[0060] Another advantage of the shear die apparatus of the present invention is that it is easier to maintain, repair and / or operate, reducing time and associated costs.

[0061] Although the present invention has been described with particular reference to embodiments thereof which are given by way of non-limiting example only, it will be apparent to those skilled in the art that various modifications and variations may occur in light of the foregoing description, and it is therefore intended that the present invention encompass all such modifications and variations which fall within the scope of the appended claims.

Claims

1. The shearing die comprises a box-shaped body (12, 30) having means for simultaneously or selectively shearing and / or shearing-deactivating the actuating members configured to cooperate with a plurality of shear punches (15) of the shearing die during the shearing process, the shear punches being coupled to spacer members (16) having elastic members (16'), the shearing and / or shearing-deactivating means being provided in numbers and positions corresponding to the number and positions of the actuating members, and comprising a plurality of sliders (18, 34) movable in a plurality of dedicated receptacles (19, 36) formed in a lower block (12", 30") of the box-shaped body (12, 30), the sliders (18, 34) cooperating with elastic members (20, 35) housed in the dedicated receptacles (19, 36).

1. An apparatus (10, 10') for a shear die for sheet metal for electrical applications, adapted to form laminate packs for electrical applications in electrical machines such as motors, generators, transformers, counters, ignition coils and other electrical equipment, characterized in that the slider has a head portion (18', 34') and a tail portion (18", 34") in the direction of the elastic member (20, 35), the tail portion having a dimension different from that of the head portion, and the head portion (18', 34') and the tail portion (18", 34") close through holes or through openings (12A, 30B) of the lower block (12", 30"), respectively, to form contact portions for the spacer member (16) that control the shearing operation enable and / or stop of the shearing operation of the shear punch (15).

2. 2. The mold apparatus (10, 10') according to claim 1, characterized in that the box-shaped body (12, 30) comprises an upper block (12', 30') tightly and firmly restrained on the lower block (12", 30"), and the lower block (12", 30") has a plurality of through holes or through openings (12A, 30B) formed in the thickness direction of its base to accommodate portions of the spacer element (16) adapted to be coupled with the shear punch (15).

3. 2. A mould apparatus (10, 10') according to claim 1, characterized in that the elastic member (20, 35) comprises a compression spring.

4. The mold apparatus (10, 10') according to any one of claims 1 to 3, characterized in that the slider (18, 34) is arranged so as to be freely slidable back and forth in a radial direction relative to the center of the lower block (12", 30").

5. 2. The mold device (10, 10') according to claim 1, characterized in that the slider (18, 34) is arranged depending on the arrangement position of the shear punch (15).

6. A mold device (10, 10') as described in claim 2, characterized in that the slider (18, 34) is positioned according to the position of the shear punch (15).

7. A mold device (10, 10') as described in claim 3, characterized in that the slider (18, 34) is positioned according to the position of the shear punch (15).

8. A mold device (10, 10') as described in claim 4, characterized in that the slider (18, 34) is positioned according to the position of the shear punch (15).

9. 2. The mold device (10, 10') according to claim 1, characterized in that it comprises a distribution means (24) for distributing compressed air supplied through attachments (22) provided in all of the accommodation portions (19) of the slider (18) in order to simultaneously enable and / or stop the shearing operation of the shear punch (15).

10. A mold device (10, 10') as described in claim 2, characterized in that it is provided with a distribution means (24) for distributing compressed air supplied through accessories (22) provided in all of the accommodating portions (19) of the slider (18) in order to simultaneously enable shearing operation and / or stop shearing operation of the shear punch (15).

11. A mold device (10, 10') as described in claim 3, characterized in that it is provided with a distribution means (24) for distributing compressed air supplied through accessories (22) provided in all of the accommodating portions (19) of the slider (18) in order to simultaneously enable shearing operation and / or stop shearing operation of the shear punch (15).

12. A mold device (10, 10') as described in claim 4, characterized in that it is provided with a distribution means (24) for distributing compressed air supplied through accessories (22) provided in all of the accommodating portions (19) of the slider (18) in order to simultaneously enable shearing operation and / or stop shearing operation of the shear punch (15).

13. A mold device (10, 10') as described in claim 5, characterized in that it is provided with a distribution means (24) for distributing compressed air supplied through accessories (22) provided in all of the accommodating portions (19) of the slider (18) in order to simultaneously enable shearing operation and / or stop shearing operation of the shear punch (15).

14. 2. The mold device (10, 10') according to claim 1, characterized in that the box-shaped body (30) is provided with attachments (38) at the locations of the sliders (34) for selectively sliding the sliders (34) in their accommodations (36) to selectively enable and / or disable the shearing action of the shear punch (15).

15. A mold device (10, 10') as described in claim 2, characterized in that the box-shaped body (30) is provided with accessories (38) at each location of the sliders (34) for selectively sliding the sliders (34) within their accommodating portions (36) to selectively enable and / or stop the shearing action of the shear punch (15).

16. A mold device (10, 10') as described in claim 3, characterized in that the box-shaped body (30) is provided with accessories (38) at each location of the sliders (34) for selectively sliding the sliders (34) within their accommodating portions (36) to selectively enable and / or stop the shearing action of the shear punch (15).

17. A mold device (10, 10') as described in claim 4, characterized in that the box-shaped body (30) is provided with accessories (38) at each location of the sliders (34) for selectively sliding the sliders (34) within their accommodating portions (36) to selectively enable and / or stop the shearing action of the shear punch (15).

18. A mold device (10, 10') as described in claim 5, characterized in that the box-shaped body (30) is provided with accessories (38) at each location of the sliders (34) for selectively sliding the sliders (34) within their accommodating portions (36) to selectively enable and / or stop the shearing action of the shear punch (15).

19. A mold device (10, 10') as described in claim 6, characterized in that the box-shaped body (30) is provided with accessories (38) at each location of the sliders (34) for selectively sliding the sliders (34) within their accommodating portions (36) to selectively enable and / or stop the shearing action of the shear punch (15).

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