EP3898023A1 - Stanzen von mindestens zwei übereinander angeordneten metallblechen - Google Patents
Stanzen von mindestens zwei übereinander angeordneten metallblechenInfo
- Publication number
- EP3898023A1 EP3898023A1 EP19818044.0A EP19818044A EP3898023A1 EP 3898023 A1 EP3898023 A1 EP 3898023A1 EP 19818044 A EP19818044 A EP 19818044A EP 3898023 A1 EP3898023 A1 EP 3898023A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheets
- semi
- finished product
- metal sheets
- punching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002184 metal Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 39
- 239000011265 semifinished product Substances 0.000 claims abstract description 38
- 238000004080 punching Methods 0.000 claims description 32
- 239000007858 starting material Substances 0.000 claims description 17
- 239000004033 plastic Substances 0.000 claims description 16
- 229920003023 plastic Polymers 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 5
- 239000010410 layer Substances 0.000 description 15
- 238000005520 cutting process Methods 0.000 description 9
- 238000009413 insulation Methods 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/005—Processes combined with methods covered by groups B21D1/00 - B21D31/00 characterized by the material of the blank or the workpiece
- B21D35/007—Layered blanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
Definitions
- the invention relates to a method for stamping in a stamping step of at least 2 metal sheets arranged one above the other, positively and / or positively arranged with one another in a stamping process by means of stamps and dies, and a stamped semi-finished product made of at least 2 metal sheets arranged one above the other, which at least selectively fabric and / or are interlocked with each other.
- the stamping technique is known and is mainly used for punching but also for the production of semi-finished products or workpieces from sheet metal strips, metal strips, plates or sheets.
- a method for punching a sandwich plate is known, for example, from DE 10047496A1.
- DE 10643076A1 describes a device for punching and joining at least two sheet metal parts obtained from sheet metal in one work step. For this purpose, devices with a relatively complicated structure that are precisely matched to the corresponding products are used.
- the object of the present invention was to provide a simple punching method which enables the punching of at least two metal sheets arranged one above the other. Another object was to provide a stamped semifinished product from at least 2 metal sheets arranged one above the other, the punched edges having a property profile which is qualitatively at least the same or better than the individually stamped sheets. In particular, the semi-finished product should be able to have complicated outlines.
- the present invention relates to a method for stamping at least 2 metal sheets arranged one above the other, with material and / or form-fitting engagement with one another, in one stamping step, characterized in that
- a starting material is made available in which the metal sheets are at least selectively and / or positively available with each other and the at least 2 metal sheets arranged one above the other are punched in one punching step by means of a punch and die, in particular in such a way that only one metal sheet is in contact with the punch and the at least one further metal sheet is punched by means of the die-side circuit board.
- At least two sheets arranged one above the other are used, which are at least selectively and / or positively connected to one another.
- An essential feature of the starting material and in particular of the material and / or form-fitting disposition is that the metal sheets cannot be moved against each other.
- the decision is designed in such a way that a shift due to the forces occurring during the entire punching process does not occur or only occurs insignificantly, or can be excluded.
- the at least 2 sheets arranged one above the other are materially and / or positively connected to one another by a method selected from the group comprising or consisting of: gluing, welding, soldering and clinching.
- the respective disposition is at least selective, but can also be local, that is to say it has a large area.
- the sheets of the starting material are preferably not or only insignificantly displaceable with one another at the edge, that is to say the sheet edge.
- insignificant displacement means that any displacement that may occur is so small that it has no influence on the method according to the invention.
- the at least two sheets of the starting material are at least selectively or locally integrally connected to one another at least in the area of the punching line or in an area within the punching line.
- the semi-finished product produced has the same number of sheets arranged one above the other as the starting material.
- the punching line is the (imaginary) line on which the punching, i.e. the separation of a sheet metal area, takes place.
- the punching line is arranged during the punching within the punching gap, preferably in the middle thereof.
- the punching line defines and essentially corresponds to the later outline of the semi-finished product. Essentially here means that the surface or a surface of the semi-finished product in shape and size, that is to say the surface within the outline, increases at least 90%, preferably 91%, 92%, 93%, 94%, 95%, particularly preferably 96%, 97%, 98%, 99%, in particular 99.5%, 100% corresponds to the area within the punched line.
- the punching is carried out by means of a punch and die, the punching gap being defined by the distance between the immersed punch and die wall.
- a cohesive connection in the area of the stamped line in the sense of the invention is defined by a range of 1 mm, 2 mm, 5 mm, preferably 10 mm on both sides of the stamped line, the area being symmetrical starting from the stamped line, in one alternative being asymmetrical .
- Another alternative relates to a starting material composed of at least 2 sheets arranged one above the other, the at least 2 sheets being integrally bonded to one another at least over the entire area within the punching line. If necessary, the starting material additionally has an area as described above outside the area to be punched out, that is to say on the other side of the punching line.
- the at least two sheets of the starting material are cohesively connected to one another by means of a plastic layer, as in an alternative described above.
- starting material with a plastic layer with a thickness of at least 2 pm, preferably at least 3 pm, particularly preferably at least 4 pm, in particular at least 4.5 pm, at least 5 pm and at most 50 pm, preferably at most 20 pm is particularly preferred preferably used at most 10 pm, 8 pm, in particular at most 7.5 pm.
- the two sheets are cohesively connected to one another by means of a plastic layer, as described above.
- the plastics are selected from thermosets, elastomers and / or thermoplastics.
- viscoelastic polymers are used as the plastic layer.
- the sheets are not welded together.
- the punching according to the invention is essentially based on the following steps or consists of:
- the fraction is characterized in that here the separation of the sheet metal parts is usually occurs at the grain boundary, while in the cut portion also grains of the metal structure are cut and thereby damaged and plastic deformations are introduced.
- electrical sheets are used, and comparable or improved electromagnetic properties are achieved by the above-described design of the punched edge.
- top and bottom are also defined: top means stamp side and bottom means die side.
- each of the sheets arranged one above the other has a thickness of at least or in each case essentially exactly 0.05 mm, preferably 0.1 mm, particularly preferably 0.2 mm, 0.25 mm, 0.27 mm, in particular 0, 3 mm, 0.32 mm, 0.35 mm, 0.4 mm, or 0.5 mm and a maximum of 1.5 mm, preferably 1 mm, particularly preferably 0.75 mm, in particular 0.65 mm.
- “essentially” means a deviation from a specific value of at most 50%, 40%, 30%, preferably 25%, 20%, 15%, particularly preferably 14%, 13%, 12%, 11 %, in particular 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%.
- the starting material to be used according to the invention has two or more sheets of the same thickness or of different thickness.
- One embodiment of the present invention relates to a method in which the punched edges of the at least 2 sheets have a different ratio of the cut to fraction due to the punching in one punching stroke.
- the ratio of the cut to the fractional fraction in the respective punched edge in the upper plate is larger than in the lower plate.
- the lower sheet preferably has a fraction of at least 30%, 40%, 50%, 52%, 54%, 56%, 58%, more preferably 60%, 61%, 62%, 63%, 64%, in particular 65 %, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75% or more.
- the ratio of cut to fraction is determined by the fact that the height of the The cutting area and the height of the fracture area is determined on the basis of the grain damage, for example using a microscope, and is related to one another.
- the multilayer starting material has an insulation layer on at least one outer side, preferably on both outer sides (the side facing away from the disposition is referred to as the outside), which brings about electrical insulation.
- the insulation layer is made from an organic polymer, preferably from a thermally, chemically or radiation-activatable adhesive.
- each sheet side has an insulation layer.
- the starting material has exactly 2 sheets arranged one above the other.
- electrical sheets so-called electrical strips
- non-grain-oriented electrical steel strips are used.
- the invention relates to a stamped semi-finished product produced in the method according to the invention.
- Another object of the present invention is a semi-finished product made of at least 2 metal sheets arranged one above the other, characterized in that the two sheets are integrally bonded to one another at least at the edge. According to the invention, the sheets are available even before punching.
- a stamped semifinished product in the sense of the invention is a semifinished product which results directly from a stamping process without any further work step.
- a cutting process in particular shear cutting, is referred to as punching, which is carried out by means of a punch and a die; if necessary, further aids such as holders, wipers, etc. are used, but these do not directly intervene in the cutting process of the sheet.
- punched semi-finished products it is essential for the punched semi-finished products according to the invention that they have a complicated outline, as described above and / or a surface as described above.
- the at least 2 sheets arranged one above the other are integrally bonded to one another in the region of the stamped edge.
- the availability on the mutually facing side of the sheets starting from the punched edge is at least 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, preferably 10 mm, 20 mm or more.
- each of the sheets arranged one above the other has a thickness of at least or in each case essentially exactly 0.05 mm, preferably 0.1 mm, particularly preferably 0.2 mm, 0.25 mm, 0.27 mm, in particular 0, 3 mm, 0.32 mm, 0.35 mm, 0.4 mm, or 0.5 mm and a maximum of 1.5 mm, preferably 1 mm, particularly preferably 0.75 mm, in particular 0.65 mm.
- the semi-finished product has sheets of different thicknesses arranged one above the other, in a further alternative at least 2 sheets have the same thickness.
- the two sheets are cohesively connected to one another by means of a plastic layer, as described above.
- the plastics are selected from thermosets, elastomers and / or thermoplastics.
- viscoelastic polymers are used as the plastic layer.
- the sheets are not welded together.
- Another embodiment relates to the semi-finished products with a plastic layer with a thickness of at least 2 pm, preferably at least 3 pm, particularly preferably at least 4 pm, in particular at least 4.5 pm and of at most 50 pm, preferably at most 20 pm, particularly preferably at most 10 pm .8 pm, in particular a maximum of 7.5 pm.
- An embodiment of the present invention relates to a semifinished product made of at least 2 sheets arranged one above the other, the punched edges of the at least 2 sheets having different ratios of the fraction of cut to fraction.
- the ratio of the cut to the fractional fraction in the respective punched edge in the upper plate is larger than in the lower plate.
- the lower sheet preferably has a fraction of at least 30%, 40%, 50%, 52%, 54%, 56%, 58%, more preferably 60%, 61%, 62%, 63%, 64%, in particular 65 %, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75% or more.
- the ratio of cut to breakage is determined by determining the height of the cut area and the height of the breakage area on the punched edge on the basis of grain damage, for example using a microscope, and comparing them to one another.
- the semi-finished product has exactly 2 sheets arranged one above the other and cohesively connected to one another.
- the sheet metal in the semi-finished product is electrical sheet, that is to say so-called electrical steel.
- An alternative is non-grain-oriented electrical steel.
- the semi-finished product according to the invention and the semi-finished product produced using the method according to the invention have an insulation layer on one or both sides.
- the same punching tool is used for the multilayer starting material containing at least two sheets as for a single-layer, monolithic, single sheet with a thickness that is equal to the thickness of one of the sheets of the multilayer starting material.
- the semifinished product according to the invention and the semifinished product produced by the method according to the invention can be arranged in stacks one above the other and can be used together.
- the joining methods known to the person skilled in the art are used, such as, for example, gluing, welding or punching packet packaging.
- Die-cut packaging is used in particular for the use of the stacks as a rotor or stator of electric motors or in a generator.
- the multi-layer semi-finished products according to the invention offer advantages over the single-layer ones.
- punching and packaging the number of process steps is reduced according to the number of layers of the semi-finished product. This also has positive effects with regard to the use of the tools.
- the semifinished product according to the invention and that with the method according to the invention Semi-finished product produced, in which the at least two metal sheets are electrical steel strips, is used in the stack or package in electric motors and / or generators.
- a stack of individually punched sheets can be seen on the left. Two sheets arranged one above the other after punching are marked with brackets on the left side. On the right side stacked semi-finished products according to the invention are shown. One of them is marked with a bracket on the right.
- the light areas show the cut area or cut share, the dark areas the break area or cut share. It can be clearly seen that the fraction on the right-hand side of the semi-finished product produced according to the invention is significantly larger in the lower sheet than in the upper sheet.
- the cutting area in the lower sheet is arranged at the lower edge of the lower sheet.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Punching Or Piercing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018133202.5A DE102018133202A1 (de) | 2018-12-20 | 2018-12-20 | Stanzen von mindestens zwei übereinander angeordneten Metallblechen |
| PCT/EP2019/084307 WO2020126633A1 (de) | 2018-12-20 | 2019-12-10 | Stanzen von mindestens zwei übereinander angeordneten metallblechen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3898023A1 true EP3898023A1 (de) | 2021-10-27 |
Family
ID=68848284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19818044.0A Pending EP3898023A1 (de) | 2018-12-20 | 2019-12-10 | Stanzen von mindestens zwei übereinander angeordneten metallblechen |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3898023A1 (de) |
| DE (1) | DE102018133202A1 (de) |
| WO (1) | WO2020126633A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102023101065A1 (de) | 2023-01-18 | 2024-07-18 | Thyssenkrupp Steel Europe Ag | Verfahren zum Herstellen eines Verbunds aus Elektroblechen |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57156657A (en) * | 1981-06-22 | 1982-09-28 | Mitsui Haitetsuku:Kk | Manufacture of laminated iron core |
| DE19643076C2 (de) * | 1996-10-18 | 2001-12-13 | Thyssenkrupp Stahl Ag | Vorrichtung zum in einem Arbeitsgang erfolgenden Stanzen und Fügen mindestens zweier Blechteile |
| DE10047496C2 (de) | 2000-09-26 | 2002-08-29 | Thyssenkrupp Stahl Ag | Verfahren zum Durchtrennen insbesondere Lochen einer Sandwichplatte und dafür geeignetes Stanzwerkzeug |
| JP3749478B2 (ja) * | 2001-12-21 | 2006-03-01 | 三菱電機株式会社 | 積層コアの製造方法 |
| DE102010002003A1 (de) * | 2010-02-16 | 2011-08-18 | Efficient Energy GmbH, 82054 | Elektromotorkörper und Verfahren zur Herstellung eines Elektromotorkörpers |
| DE102011056807A1 (de) * | 2011-12-21 | 2013-06-27 | Thyssenkrupp Electrical Steel Gmbh | Magnetfeldabschirmung für elektromagnetische Felder und Fahrzeug mit integrierter Magnetfeldabschirmung |
| DE102012101913A1 (de) * | 2012-03-07 | 2013-09-12 | Thyssenkrupp Steel Europe Ag | Leichtblech und ein Leichtblech umfassende Konstruktion |
| EP2698796A1 (de) * | 2012-08-16 | 2014-02-19 | Siemens Aktiengesellschaft | Kern für einen Transformator oder eine Spule sowie Transformator mit einem solchen Kern |
| CN109311073B (zh) * | 2016-04-05 | 2023-08-01 | 罗伯特·博世有限公司 | 金属部件的冲裁方法和适用于这种冲裁方法的冲裁装置 |
| DE102017009132A1 (de) * | 2017-09-29 | 2018-03-22 | Daimler Ag | Blech für ein Blechpaket einer elektrischen Maschine, Blechpaket für eine elektrische Maschine sowie ein Verfahren zum Herstellen eines solchen Bleches |
-
2018
- 2018-12-20 DE DE102018133202.5A patent/DE102018133202A1/de active Pending
-
2019
- 2019-12-10 EP EP19818044.0A patent/EP3898023A1/de active Pending
- 2019-12-10 WO PCT/EP2019/084307 patent/WO2020126633A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020126633A1 (de) | 2020-06-25 |
| DE102018133202A1 (de) | 2020-06-25 |
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