EP0060355B2 - Vorrichtung zum Stanzen eines Zuschnittes aus Streifenmaterial - Google Patents

Vorrichtung zum Stanzen eines Zuschnittes aus Streifenmaterial Download PDF

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Publication number
EP0060355B2
EP0060355B2 EP81301101A EP81301101A EP0060355B2 EP 0060355 B2 EP0060355 B2 EP 0060355B2 EP 81301101 A EP81301101 A EP 81301101A EP 81301101 A EP81301101 A EP 81301101A EP 0060355 B2 EP0060355 B2 EP 0060355B2
Authority
EP
European Patent Office
Prior art keywords
die
blanking
punch
stock
piercing
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.)
Expired
Application number
EP81301101A
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English (en)
French (fr)
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EP0060355A1 (de
EP0060355B1 (de
Inventor
Edward Donald Bennett
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Individual
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Individual
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8188239&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0060355(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Priority to AT81301101T priority Critical patent/ATE12594T1/de
Priority to EP81301101A priority patent/EP0060355B2/de
Priority to DE8181301101T priority patent/DE3169783D1/de
Publication of EP0060355A1 publication Critical patent/EP0060355A1/de
Application granted granted Critical
Publication of EP0060355B1 publication Critical patent/EP0060355B1/de
Publication of EP0060355B2 publication Critical patent/EP0060355B2/de
Expired legal-status Critical Current

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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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/16—Shoulder or burr prevention, e.g. fine-blanking

Definitions

  • the present invention relates to the production of component parts by stamping a smooth edge blank from material and is concerned particularly with an improved method and apparatus for producing such stampings.
  • stampings from stock material is either by a conventional stamping process or by a fine-blanking process.
  • a stamping produced by conventional methods suffers from the disadvantage known in the art as die break.
  • the cooperating punch and die produce an initial shearing action after which the blank is severed by fracturing.
  • a ridge, known as “shear” extends around the edge of the stamping and divides the portion that has sheared from the portion that has fractured.
  • the fractured portion is the "die break” and is rough and granular in nature. As the thickness of the blank from which the stamping is produced increases so does the problem of die break.
  • Fineblanking finds particular application where component parts having close tolerances are required since when a blank is produced by fineblanking many subsequent machining operations, such as grinding, milling, etc., are rendered unnecessary. Although the process of fineblanking has these beneficial and advantageous features, it suffers also from substantial drawbacks. Two of the most serious drawbacks are the need to provide a special press and the slow speed of operation of such a press.
  • the special press for performing fineblanking operations has hitherto been a triple action punch press which operates to provide three required forces. These forces, which are shear pressure, "yee ring” pressure and counter pressure, necessitate the provision of a special press which is particularly expensive and must be extremely robust to provide sufficient support to absorb reaction, sudden pressures, and all vibration.
  • known fineblanking presses must securely clamp both the blank and the stock material from which the blank is stamped.
  • That special component conventionally comprises an upstanding pointed ridge which serves to engage, and in fact "bite into", the stock material around the area to be blanked out.
  • the ridge is termed as “stinger” and may be either in the form of a separate annular disc having an appropriately profiled upper surface or may, in some embodiments, be embodied in a component known as a "stripper" which is utilized to remove the surplus stock material after the stamping or blank has been removed.
  • the present invention does away with the need to provide a stinger and teaches a method of producing fine edge stampings which does not involve clamping of the stock material around the area to be blanked. In other words, only the area which will be blanked is clamped during the blanking operation.
  • the elimination of the stinger not only allows more stampings to be produced per unit length of stock material but, moreover, allows the stock material freely to flow away from the blanking punch which has the beneficial effect of reducing heat and friction around the blanking punch during stock removal thereby increasing the life of the blanking punch.
  • the present invention also allows the use of a standard press of the type commonly found in practically all metal stamping plants.
  • This standard press which is simple in construction when used in accordance with the present invention, is capable of operation at speeds hitherto inappropriate for fineblanking.
  • the present invention also provides a stamping die comprising a blanking punch and die combination in accordance with this invention.
  • a blanking punch and die combination or a stamping die provides a radiused edge of specific dimensions of the die which cooperates with the blanking punch with a working clearance of not more than 1% of the stock material thickness. It has already been explained how the elimination of a stinger enables the purplus stock material to flow away and the provision of this radiused edge enhances such flowing away of scrap material. In fact, this feature should be considered in conjunction with the increased speed of operation, made possible by the press of the invention.
  • the advantage obtained by the present invention can best be explained by observing that prior fineblanking presses operate to extrude metal to achieve a smooth edge, whereas the present invention makes it possible to stamp the metal to produce a product having the same quality.
  • the illustrated press serves simultaneously both to smooth edge blank and smooth edge pierce an article from a sheet of strip of stock material in a single stamping operation.
  • the press incorporates a ram 10 movable towards and away from a bolster 12 by means of, for example, a rotating crankshaft (not shown).
  • An upper die shoe 14 is carried by the ram 10 and a lower die shoe 16 is mounted to the bolster 12.
  • the lower die shoe is securely attached to the bolster 12 by, for example, screw means generally designated 18.
  • screw means are utilized illustratively where various components of the press are to be secured to one another. It will, of course, be appreciated that such screw means represent examples only and any suitable conventional means may be utilized to secure components to one another.
  • the upper die shoe 14 is secured to the ram 10 through the intermediary of a spring loaded power pack generally designated 20.
  • the spring loaded power pack is secured in position by a T-plate 22 secured to, and carried by, the ram 10 by means of, for example, screws 24, 26.
  • the T-channel in the T-plate 22 receives and retains a housing 28 having a base 30, depending side walls 32 and a cover 34.
  • the base 30 has a flange or rim 36 projecting peripherally outwardly to seat within the T-channel of the T-plate 22.
  • the base, side walls and cover of the housing 28 define an internal chamber which accommodates a spring element or elements 38. That spring element bears on a platform 40 to urge the platform downwardly into abutting engagement with the cover 34.
  • the cover 34 is secured to the side walls 32 and the upper die shoe 14 is, in turn, secured to the cover 34.
  • this joint securing may be effected by common screws 42 and 44 extending from the die shoe 14 through the cover 34 and into the side walls 32.
  • a blanking punch 50 is secured to the lower die shoe 16 and a cooperating blanking die 52 is secured to and carried by the upper die shoe 14.
  • the drawings show the blanking die 52 secured to the upper die shoe 14 by screw means 54, 56 and the blanking punch 50 secured to the lower die shoe 16 by screw means 58, 60 extending through an outwardly directed peripheral flange 62 provided at the base of the punch 50.
  • the punch 50 has a concentric bore 64 extending therethrough from top to bottom, which bore 64 constitutes a piercing die.
  • a cooperating piercing punch 66 is carried by the upper die shoe 14.
  • the die 66 has a barrel portion 68 disposed rearwardly of the leading end and terminating in an enlarged head 70.
  • the upper die shoe 14 is provided with concentric bores of different diameter to define a shoulder 72 against which the heat 70 of the punch seats. The shoulder 72 prevents ejection of the punch 66 downwardly out of the upper die shoe 14 and the cover 34 prevents movement of the punch in the opposite direction.
  • the shedder 74 serves to exert a clamping force on the stamping to restrain the latter during piercing and blanking operations.
  • the restraining force is asserted by the spring element 38 and is transmitted from that spring element via the platform 40 and pins 78, 80 extending through aligned appropriately dimensioned bores in the cover 34 and upper die shoe 14.
  • pins 78, 80 are shown in the drawings, preferred embodiments of the invention utilize four such pins.
  • the shedder engaging ends of the pins are flared at 82 and 84 to present enlarged surfaces in contact with the shedder 74.
  • the blanking punch 50 Whilst the piercing punch 66 is surrounded by the shedder 74, the blanking punch 50 is surrounded by a stripper 86.
  • the stripper is in the form of a plate having a central aperture 88 dimensioned to encompass the external periphery of the blanking punch.
  • the stripper 86 is displaceable longitudinally of the blanking punch upwardly towards a supported stamping under the influence of spring means 90, 92.
  • the biasing spring force in this respect is transmitted by the spring means 90, 92 which abut at one end on a platform 94 and at the other end on a movable platform 96 shown most clearly in Figures 2 and 4.
  • the spring biased movement of the platform 96 is transmitted to the stripper 86 by elongated pin members 98 extending through aligned bores 100, 102 extending through the bolster 12 and lower die shoe 16 respectively.
  • the pin members 98 are stepped along their length with each portion of different diameter being received in mating bores 100, 102 of corresponding diameter.
  • the drawings show only one such pin member 98 in detail but illustrate that at least one further pin member may be provided. In fact, it is preferred to provide four such stripper biasing pin members.
  • Each pin member 98 is attached to the stripper by, for example screw means 104.
  • spacers 106, 108 are carried on the under side of the blanking die 52 to control the closest spacing between that blanking die and the stripper 86. It is important to note that the depth of the spacers 106, 108 is at least twice the thickness the stock material to be stamped.
  • the bolster 12 is mounted to the punch press frame (not shown).
  • the platform 110 is fastened to the bolster 12 by screws 112.
  • Platform 94 and sleeves 114 are retained in position relative to platform 110 by screw bolts 116.
  • the spring means 90, 92 are disposed around the sleeves 114 and engage the under side of the platform 96 through the intermediary of washer elements 118, 120.
  • the above described components of the invention occupy the position shown in Figure 1. That is to say, the ram 10 is fully withdrawn to its uppermost position to create a maximum gap between the blanking punch 50 and the blanking die 52.
  • a strip of stock 122 from which a stamping is to be made is fed into the position shown in Figure 1 where it overlies the uppermost surface of the blanking punch 50. Feeding of the stock may be either manually or by an automatic feed.
  • the controls are operated to cause the ram 10 to descend.
  • a first contact between the relatively movable upper and lower parts of the stamping die is made by the spacers 106, 108 on the uppermost surface of the stripper 86.
  • This initial contact is ensured by the fact that the depth of the spacers 106, 108 is at least twice the thickness of the stock material 122.
  • continued downward movement of the ram 10 causes the stripper 86 to move downwardly against the influence of the spring means 90, 92.
  • Figure 2 of the drawings shows the component parts in their relative positions at the point when said secondary contact is established.
  • the respective punches and dies commence the blanking and piercing operations.
  • the punch 50 cooperates with the edges of the die 52 defining the bore 76.
  • those edges 124 of the die 52 are radiused. The provision of a radiused or rounding on the operational edges of the die 52 is crucial to the provision of a smooth edge stamping.
  • the edges 124 of the die 52 are radiused but it is also very important that there be minimal clearance between the external periphery of the punch 50 and the wall portions of the die bore 76.
  • "minimal" is a relative term, it will be clearly understood in the context of conventional punches and dies where it is usual to have a clearance between the punch and die equal to approximately ten per cent of the thickness of the material to be stamped. In the case of the present invention, the clearance is preferably not more than one per cent of the thickness of the material to be stamped.
  • Figure 3 of the drawings shows the respective punch and die parts relatively positioned so that the blanking operation effected by the punch 50 and cooperating die 52 begins before the piercing operation effected by the punch 66 and die bore 64, it is obviously possible relatively to position the punch 66 with respect to the die 52 so that the blanking and piercing operations commence simultaneously. Alternatively, the piercing operation might be arranged to begin before the blanking operation. The time increment, if any, between commencement of the blanking and piercing operations is governed by the position of the forward end of the punch 66 with respect to the underside and radiused edges of the die.
  • the ram 10 Upon completion of the piercing and blanking operations, the ram 10 is retracted upwardly by the crankshaft. This, is turn, effects a withdrawal of the spacers 106, 108 thereby freeing the stripper 86 which is caused also to move upwardly under the influence of the spring means 90, 92 which transmit their force through the washers 118, 120, the support 110 and the pins 98.
  • FIG. 4 This final stage in the sequence of operations is shown in Figure 4 of the drawings.
  • the stripper 86 is shown supporting the removed scrap 126. Further upward motion of the ram 10 from the position shown in Figure 4 will create a space between the underside of the shedder 74 and the stamping whereupon the stamping may be removed by any convenient means and preferably by a blast of compressed air. At this point in time, it is impossible for the completed stamping to be forced back in to the stock from which it was removed due to the fact that the spacers 106, 108 are more than twice the tickness of the stamping.
  • the radius of the die edge forming the opening is from about 0.127 mm to about 0.635 mm depending on the type and tickness of the stock material.
  • the spring loaded power pack 20 preferably is powered by a gaseous spring which may be a nitrogen gas spring.
  • the depth of the spacers 106,108 need only be at least twice the stock thickness where the stamping is to be blown out of the die. To comply with the inventive concept in its broadest aspect the spacers need only space the die and stripper by a distance exceeding the thickness of the stock material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Punching Or Piercing (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Claims (3)

1. Stanzstempel- und Stanzplattenkombination, zur Verwendung in einer Standardpresse, um Zuschnitte von Streifenmaterial zu schneiden mit einer Stanzplatte (52), mit einer Öffnung, mit einem damit zusammenarbeitenden Stanzstempel (50), der einen diesem zugeordneten Gegenhalter (72) aufweist, wobei der Stempel so bemessen ist, daß er mit einem Arbeitsspiel in die öffnung paßt, wobei der Gegenhalter in der Plattenöffnung verschiebbar ist, um als eine Druckuntedage zu wirken, um das Streifenmaterial über der zu stanzenden Fläche zwischen ihm und dem Stempel festzuklemmen und um geschnittene Zuschnitte auszuwerfen, mit einem Abstreifer (86), der den Stempel zum Entfernen von überschüssigem Streifenmaterial um den Stanzstempel herum nach einer Stanzoperation umgibt, und mit Abstandshaltemittel (106, 108), die zwischen der Stanzplatte (52) und dem Abstreifer (86) angeordnet sind, um das Abstreifen zu erleichtern, dadurch gekennzeichnet, daß die Öffnung der Platte einen abgerundeten Rand aufweist (an sich beim Feinstanzen bekannt) mit einem Radius zwischen ungefähr 0,127 und 0,635 mm, daß das Arbeitsspiel nicht mehr beträgt als ungefähr 1% der Dicke des Streifenmateriales und zwar in Abhängigkeit von seiner Art und Dicke, und daß die Abstandshaltemittel von einer derartigen Stärke sind, daß während einer Stanzoperation die Stanzplatte (52) und der Abstreifer (86) genügend weit voneinander auf Abstand gehalten sind, um sicherzustellen, daß der umgebende bereich des Streifenmateriales dazwischen nicht eingeklemmt wird.
2. Kombination nach Anspruch 1, gekennzeichnet durch einen Lochstempel (66) und ein Lochgesenk (64), wobei sich der Lochstempel (66) durch den Gegenhalter (74) erstreckt und das Lockgesenk (64) von einer den Stanzstempel (50) durchsetzenden Bohrung (64) gebildet wird.
3. Kombination nach Anspruch 2, dadurch gekennzeichnet, daß der Lochstempel (66) einen abgerundeten Führungsrand besitzt.
EP81301101A 1981-03-17 1981-03-17 Vorrichtung zum Stanzen eines Zuschnittes aus Streifenmaterial Expired EP0060355B2 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT81301101T ATE12594T1 (de) 1981-03-17 1981-03-17 Vorrichtung zum stanzen eines zuschnittes aus streifenmaterial.
EP81301101A EP0060355B2 (de) 1981-03-17 1981-03-17 Vorrichtung zum Stanzen eines Zuschnittes aus Streifenmaterial
DE8181301101T DE3169783D1 (en) 1981-03-17 1981-03-17 Apparatus for producing a blank from stock material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP81301101A EP0060355B2 (de) 1981-03-17 1981-03-17 Vorrichtung zum Stanzen eines Zuschnittes aus Streifenmaterial

Publications (3)

Publication Number Publication Date
EP0060355A1 EP0060355A1 (de) 1982-09-22
EP0060355B1 EP0060355B1 (de) 1985-04-10
EP0060355B2 true EP0060355B2 (de) 1991-03-06

Family

ID=8188239

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81301101A Expired EP0060355B2 (de) 1981-03-17 1981-03-17 Vorrichtung zum Stanzen eines Zuschnittes aus Streifenmaterial

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EP (1) EP0060355B2 (de)
AT (1) ATE12594T1 (de)
DE (1) DE3169783D1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3324680A1 (de) * 1983-07-08 1985-01-24 DAKO-Werkzeugfabriken David Kotthaus GmbH & Co KG, 5630 Remscheid Verfahren zum feinschneiden von werkstuecken und feinschneidwerkzeug zur ausuebung des verfahrens
DE19605113C2 (de) * 1996-02-12 2000-05-18 Berbott Gmbh Feinschneidverfahren und Feinschneidwerkzeug
ITVE20070026A1 (it) * 2007-04-24 2008-10-25 Dallan Spa Macchina punzonatrice.-
CN103920814A (zh) * 2014-04-24 2014-07-16 靖江三鹏汽车模具制造有限公司 小零件的落料冲孔工艺
CN106238574A (zh) * 2016-08-29 2016-12-21 上海奥林汽车配件有限公司 一种闷盖成型模具
CN112238184A (zh) * 2019-07-16 2021-01-19 河南森源重工有限公司 一种管夹冲压模具
CN111438249B (zh) * 2020-04-09 2021-08-06 肇庆市乐福来五金制品有限公司 一种五金压模设备
CN114367578B (zh) * 2021-12-20 2023-07-14 苏州裕坤科技有限公司 一种连续冲压阀板模具工艺
CN115301819B (zh) * 2022-08-16 2025-07-29 武汉日晗精密机械有限公司 一种斜滑块刺破装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD82643A (de) *
DE908122C (de) * 1950-11-08 1954-04-01 Oskar Stoeckli Verfahren und Vorrichtung zum Stanzen und Nachschneiden von Formstuecken
DE1169404B (de) * 1959-09-02 1964-05-06 Kienzle Apparate Gmbh Werkzeug zum Stanzschneiden von Blech
FR1287766A (fr) * 1961-04-17 1962-03-16 Infranor Sa Presse à étamper
US3488987A (en) * 1967-12-07 1970-01-13 Oscar W Stoeckli Method and apparatus for producing smooth-edge blanked sheet metal parts
DE1805984B2 (de) * 1968-10-30 1971-09-16 Schnittpresse mit zuschnitthalter und zuschnittgegenhalter
US3635067A (en) * 1969-09-24 1972-01-18 Honeywell Inc Apparatus and method for fine blanking of parts
IT972789B (it) * 1972-12-22 1974-05-31 Ibm Spa Procedimento e dispositivi di tranciatura senza bave

Also Published As

Publication number Publication date
ATE12594T1 (de) 1985-04-15
EP0060355A1 (de) 1982-09-22
EP0060355B1 (de) 1985-04-10
DE3169783D1 (en) 1985-05-15

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