US2397582A - Corrugating die - Google Patents

Corrugating die Download PDF

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Publication number
US2397582A
US2397582A US525788A US52578844A US2397582A US 2397582 A US2397582 A US 2397582A US 525788 A US525788 A US 525788A US 52578844 A US52578844 A US 52578844A US 2397582 A US2397582 A US 2397582A
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United States
Prior art keywords
punch
die
corrugation
sheet
dies
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Expired - Lifetime
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US525788A
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James A Watt
Alfred J Perkins
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Curtiss Wright Corp
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Curtiss Wright Corp
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Priority to US525788A priority Critical patent/US2397582A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D13/00Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
    • B21D13/02Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by pressing

Description

April 2,1946. J, A. WATT ET AL 2,397,532
CORRUGATING DIE x Filed March 9, 1944 2 Sheets-Sheet 1 JAMES A. WATT BY ALFRED J. PERKINS ATTORNEY pr 2, 1946- J. A. WATT ETAL 2,397,582
CORRUGATING DIE Filed March 9, 1944 2 Sheets-Sheet 2 INVENTO'R JAMES A. WATT BY L RED J. PERKINS ATToRNEY Patented Apr. 2, 1946 CORRUGATING DIE James A. Watt and Alfred J. Perkins, Buffalo,
N. Y., assignors to Curtiss-Wright Corporation, a corporationof Delaware Application March-9, 1944, Serial'No. 525,788
4 Claims.
This invention relates to improvements in corrugating dies and, although not necessarily limited to such use, is characterized by features which render it of. particular utility in connection with the formation of straight-sided corrugations.
Corrugating dies, as heretofore proposed, have the objection that when utilized in connection with the annealed sheets, the subsequent heat treatments to which the latter are subjected for hardening purposes cause warping f the sheets and thereby render it difiicult, and in many instances impossible, to maintain the required tol erances. On the other hand, when the sheets are re-hardened and a brake employed to form the corrugations it is even more difficult to maintain the required tolerances. Regardless of the method employed, therefore, the finished corrugated sheet may be warped or the corrugations thereof may be inaccurately formed.
The principal object of the present invention is to overcome the above objections, this object contemplating dies which are available for use in connection with the corrugating of hardened sheets and which when so employed are adapted to form corrugations which are uniform and highly accurate as to dimensions and to the locations between the centers of the crest portions.
A further object is a novel design and arrangement of the dies, whereby to enable the corrugations to be formed rapidly and without stretching, thinning, stressing or marring of the walls thereof. I
The invention is illustrated in the accompanying drawings, in which:
Figure 1 is an end elevational view of dies embodying the features of the invention, the dies being shown at the completion of a stroke in which a pilot corrugation is formed.
Figure 2 is a similar view showing the relation of the dies when a side and the bottom of a second corrugation are formed.
Figure 3 is a similar view showing in full lines the relation of the dies just prior to the operation of the latter to form the third corrugation and in dotted lines the open position of the dies.
Figure 4 is a similar view showing the relation of the dies after completion of the stroke in'which the third corrugation is formed.
Figure 5 is a fragmentary elevational view, partially in section, of the entrance side of the die set.
Figure 6 is a similar view also partially in section, of the opposite side of the die set.
Figure 7 is a detail sectional view.
The dies are'illustrated in connection with a powerpress which is sufiiciently indicated for the purpose in view byashowing of the bed I0 and ram I I thereof. A punch assembly I2 is carried by the latter. The said assembly, which includes elongated, parallel punch elements I3, I4 and I5, also includes a holder IS, the latter being carried by parallel bars "which are secured to the ram II- by clamps I B. The punchelement I4 and an angle member I9 which are suitably secured together as a unit are connected to the holder I6 by bolts Ml (Figure 1), the said unit being normally held in the extended position shown in Figure 3 by springs 21, The punch element I4 and angle member I9 carry the-punch element I5 either in an operative, or extended, position or in an inoperative, or retracted, position. To this end a bar 22 which is suitably secured to the overhanging flange on the punch element It is formed with a series of spaced lugs 23. The latter cooperate with a similar series of lugs H formed on the top of the punch element I5, the Jugs iii-being adapted either angle member I9 and in the punch elements I4 and I5. By removing the pins 25, shifting the punch element I5 lengthwise and then elevating it, the lugs on the punch element may be caused to register with and 'enter the spaces between the lugs on the bar 22. The punch element I5 is thereby withdrawn to an inoperative position in which it may be locked by the pins 25.
' The punch element I3 is suspended from the holder IS in a position alongside the punch elerhent I4 by a bar 26. The latter may be secured to the holder by a key 21 and bolts 28 either in a position' to hold the punch element I3 in an extended, or operative, position or in a retracted, or inoperative position, the bar 26 being formed with slots 29 (Figure 5)' for accommodating the bolts 28 in either position of said bar. Backing blocks 38*are' preferably employed in connection with the bar 26, being'arranged between the latter and the bars l1 when the punch-element I3 occupies its extended position. When the said element is to be withdrawn to its retracted position, the blocks are movedto one side, as indicated in dotted lines in Figure 5, so that they may enter the spaces between the bars H.
The punch element I 3 is pivotally connected to the bar 26 by a shaft 3|. The'latter is journaled in a bearing 32 which is'i'ormed in the underside of the bar 26, being secured therein by caps 33 and being formed with half-round sections 34 to which the punch element is secured by bolts 35.
'The shaft 3| supports the punch element l3 so that it may swingeither to a'position in which it contacts the side of the punch element M or to the angular position shown in Figure 3. The punch elementf I3 is biased .to the latter position by spring-loaded pins 31 which are carried by the former and which act against the adjacent side wall of the punch element .|4.- Outward movement of the punch element |3 in response to the spring-loaded pins 31 is limited by enga ement of an angularly inclinedshoulder 39 on the said element with the underside of the bar 26 have been moved downwardly a predetermined A die member 4|] cooperates with the punch assembly described. The said member (Figure 3) is normally supported above a bed plate 4| by air-actuated plungers 42, the said bed plate rest-. ing on the bed ID of the press and carrying guides 43 which are accommodated in bores 44 formed in. the holder Hi. The die member 40 may alsooccupy a position as shown in Figure 1, in which it is seated on thebedplate 4|, suitable means being provided forjguiding the die member bedistance by the ram, an angularly inclined wall 50 on the under side of the die member 40 engages'an underlying wall 5 l of an elongated rotatable member 52. The latter is journaled in spaced bearing blocks 53 (Figure 5) and is normally held in the angular position shown in Figure 3 ,by springs 54 which at one end are connected to arms55 carried 'by the rotatable member and which at their opposite ends are connected to the base plate 4|. When the angular wall on the under side of the die member 40 engages the wall 5| of the member 52, the continued movement of the die member causes the member 52 to turn in the bearings 53, whereby a face 55 on the member 52 engages that portion of the sheet 46 which is to form the second side' of the second corrugation and bends the said tween, the two positions shownwhile holding it 7 elevated to withdraw the punchassembly I2, and
without disturbingQthe sheet 46 the punch ele ment I3 is lowered to and securedin its operative position and the ram of the press again actuated. At this time the punch element |3 moves in front of a guide member ll and lightly engages the sheet 46 as best shown in Figure 3, while the springs 2| hold the adjacent punch assembly I 4 extended as, this occurs.
'Thereafter as the ram continues its working 'stroke, the plungers 42 support the die member v in its elevated position while the springs 2| yield to permit theholder |6to move toward the punch elements 14 and-15. During this relative movement between the holder l5 and'the punch elements I4 and I5, the punch element |3 moves with the holder. As the punch element I3 is actuated in the manner described, a curved wall of the guide acts againstit to cause it to swing inwardly toward and against the side wall of the punch element l4 against the action of the spring-loaded pins 31, whereby to form a sidewall and the bottomwall of a second corcorrugation areformed, the lostmotion between the holder l6 and the die elements l4 and I5 istaken up so that thereafter as the ram continues its working stroke all of the elements of the punch assembly l2 and the die member 40 moves as a unit, the pressure'acting against the plungers 42 being predetermined to support the said die member against yielding movement until the lost motion between the holder l6 and the die elements [4 and |5has been wholly taken up; After the punch assembly and die member side against the cooperating side face of. the punch element l3. As the die member 40 seats on the bed plate 4|; a radialportion 51 of the rotatable member 52 engages an end wall 58 of the die member 40. At this time, therefore, the die member 40 and rotatable member 52 form a continuous die cavity in which the punch element l3 completes its forming operation. Thus, although the punch element l3, die'member 40 and rotatable member 52 and the sheet mate-.
rial, their final action is that of cooperating male and female dies. ,7
Upon completion of the second corrugation,-the
ram of the press is retracted towithdraw the punch assembly and permit the elements thereof andthe die members l3 and 52 to be restored to their original positions. Thepunch element I5 is then lowered to, and secured in, its operative position and after the sheet 46 has been advanced to position the pilot corrugation in the die cavity which the punch element I5 is to enter and the second corrugation in the cavity which the punch element I4 is to enter, the ramis again actuated to cause the punch element l3 to form a third corrugation 59, as illustrated in Figure 4, in the same manner in which the second corrugation was formed. Thereafter all of the elements of the punch assembly are employed in each operation of the press. a
It will be noted that in the operation of the forming dies, each corrugation, except the pilot corrugation, is initially formed by the punch element I3 and cooperating die members 40' and 52. Each corrugation which is thus formed is thereafter acted upon first by the punch element l4 and then by the punch element l5. In accordance with the invention the punch element l3 forms corrugations having side walls which are flared less than the final angle of flare pro-' duced-by the punch elements I 4 'andfl5. This has the advantage that a corrugation which has been roughly formed by the punch element l3 will readily enter the die cavity in which the punch element I4. operates and in which it is sized. The sized corrugations are restruck. by the punchelement I5. Thus after the first two corrugations have been formed each operation ofthe dies forms a'new-corrugation, sizes a preformed corrugation and restrikes a pre-sized corrugation. a
From the-foregoing it will be apparent that in. corrugating thesheet 46 in the manner described, no portions thereof are subjected to a drawing action, hence there is no thinning or stretching of any of the zones of the said sheet,
- it being noted in this connection that the punch element l3 initiallyiengagesthe sheet"46 (see Figure 3) along a line at which the bend connecting a side wall and the bottom wall of the corrugation will be formed and that this line of contact is maintained as the said punch element moves downwardly and at the same time swings inwardly. There is also very little sliding contact between the sheet 46 and the rotatable member 52. The dies, therefore, have the further advantage that scoring of the sheet as an incident to the forming operations is minimized.
A further advantage obtained is that at the time a corrugation is being formed by the punch element l3, the sheet is firmly gripped between the punch elements l4 and I5 and the die member lil while the punch element l4 and the said die member provide a straight edge over which the sheet may be bent. As a result of this and the action of the rotatable member 52 in the manner described, the sheet acted upon may be of hardened stock, it being possible with such stock to form corrugations which may be held well within the desired tolerances.
We claim as our invention:
1. In a power press having relatively movable opposed working members, the combination of forming dies for corrugating sheet material including a female die member yieldably carried on one of the working members, companion punch elements carried on the other of said working members, one of which is normally extended and the other of which is normally retracted, said last mentioned punch element being pivotally mounted on said other working member, means for normally holding said last mentioned punch element in an angular relation with respect to said first mentioned punch element, means for advancing said punch elements while holding said die member relatively stationary thereby first to cause said first mentioned punch element to enter a pre-formed corrugation in said material and said last mentioned punch element then to be advanced with respect to, and to be pivoted toward, said first mentioned punch element against the action of said first mentioned means to form part of a second corrugation, said second mentioned means being thereafter operative to cause yielding movement of said die member and advance said punch elements and die member as a unit, and means on said one working member for cooperating with said last mentioned punch element and said die member and responsive to the movement of the latter for forming another part of said second corrugation.
2. In a power press having relatively movable opposed working members, the combination of dies for forming straight-sided corrugations in sheet material including a female die member yieldably mounted on one working member, companion punch elements mounted on another working member, one of which is normally extended and the other of which is normallyretracted, said last mentioned punch element being pivotally mounted on said other working member, means for normally holding said last mentioned punch element in an angular relation with respect to said first-mentioned punch element, means for advancing said punch elements while holding said die member relatively stationary thereby first to cause said first mentioned punch element to enter a pre-formed corrugation in said material and said last mentioned punch element then to advance with respect to, and to be pivoted toward, said first mentioned punch element against the action of said first mentioned means to form a side and the bottom portions of a second corrugation, said second mentioned means being thereafter operative to cause yielding movement of said female die member and advance said punch elements and die member as a unit, and means on said one working member for cooperating with said last mentioned punch element and said die member and responsive to the movement of the latter for forming the other side portion of said second corrugation.
3. In a power press having relatively movable working members, the combination of forming dies for corrugating sheet material including a female die member yieldably mounted on one working member, companion punch elements mounted on the other working member, one of which is normally extended and the other of which is normally retracted, said last mentioned punch element being pivotally mounted on said other working member, means for normally holding said last mentioned punch element man angular relation with respect to said first mentioned punch element, means for advancing said punch elements while holding said die member stationary thereby first to cause said first mentioned punch element to enter a preformed corrugation in said material and said last mentioned punch element to be advanced with respect to said first mentioned punch element, a guide on said one working member for causing said last mentioned punch element to swing toward said first mentioned punch element as it is advanced relatively to the latter, whereby to form a part of a second corrugation, said second mentioned means being thereafter operative to advance said punch elements and die member as a unit, and means on said one working member for cooperating with said last mentioned punch element and said die member and responsive to the movement of the latter for forming another part of said second corrugation.
4. In a power press having relatively movable Working members, the combination of dies for forming straight-sided corrugations in sheet material including a female die member yieldably mounted on one of the working members, companion punch elements movably mounted on the other Working member, one of which is normally but yieldably extended and the other of which is normally retracted, means for advancing said punch elements while holding said die member stationary, thereby first to cause said first mentioned punch element to enter a pre-formed corrugation in said material and thereafter to yield so that said last mentioned punch element will be in position to form a side wall and the bottom of a second corrugation, said means being thereafter operative to advance said punch elements and yieldable die member as a unit, and sheet material folding means for cooperating with said last mentioned punch elementand said die member while they are moving as a unit to fold a portion of the sheet material to form the other side of said second corrugation, said last mentioned punch element, said die member and said folding means cooperating in the forming of the sides of said second corrugation so that the angles that they form with respect to the bottom are sharper than the corresponding angles between the sides and bottom of said pre-formed corrugation after being acted upon by said first mentioned punch element.
JAMES A. WATT. ALFRED J. PERKINS.
US525788A 1944-03-09 1944-03-09 Corrugating die Expired - Lifetime US2397582A (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2443377A (en) * 1945-09-04 1948-06-15 Palo R Daniel Machine for forming louvered fins for radiator cores
US2510024A (en) * 1940-03-27 1950-05-30 Mayer Eugene Means for corrugating metal sheets
US2623442A (en) * 1949-10-21 1952-12-30 Paper Package Company Box partition forming and inserting machine
US2761407A (en) * 1952-01-02 1956-09-04 Alliance Ware Inc Press and method of drawing two depressions in flat sheet material
US2948325A (en) * 1957-05-06 1960-08-09 Smith Corp A O Die construction for forming corrugated sheets
US3314271A (en) * 1964-04-03 1967-04-18 Automated Building Components Punch press
US3319452A (en) * 1963-10-07 1967-05-16 Rohr Corp Corrugation punch press
US3340719A (en) * 1964-10-28 1967-09-12 Strick Corp Apparatus and method of producing multiple corrugations simultaneously
US3406558A (en) * 1965-11-29 1968-10-22 Burndy Corp Crimping tool
US3641803A (en) * 1969-04-24 1972-02-15 Coq Nv Methods for the manufacture of a contact strip folded in zigzag for a fixed switching contact and folding machines for performing said methods
US3845654A (en) * 1973-07-13 1974-11-05 Caterpillar Tractor Co Die forming apparatus
US4943339A (en) * 1987-04-21 1990-07-24 Ethan Ernest Apparatus for manufacturing corrugated plywood composites
US20130255345A1 (en) * 2012-04-03 2013-10-03 Calsonic Kansei Corporation Fin processing apparatus
US20130277884A1 (en) * 2012-04-18 2013-10-24 Medtronic Vascular, Inc. Method and apparatus for creating formed elements used to make wound stents

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2510024A (en) * 1940-03-27 1950-05-30 Mayer Eugene Means for corrugating metal sheets
US2443377A (en) * 1945-09-04 1948-06-15 Palo R Daniel Machine for forming louvered fins for radiator cores
US2623442A (en) * 1949-10-21 1952-12-30 Paper Package Company Box partition forming and inserting machine
US2761407A (en) * 1952-01-02 1956-09-04 Alliance Ware Inc Press and method of drawing two depressions in flat sheet material
US2948325A (en) * 1957-05-06 1960-08-09 Smith Corp A O Die construction for forming corrugated sheets
US3319452A (en) * 1963-10-07 1967-05-16 Rohr Corp Corrugation punch press
US3314271A (en) * 1964-04-03 1967-04-18 Automated Building Components Punch press
US3340719A (en) * 1964-10-28 1967-09-12 Strick Corp Apparatus and method of producing multiple corrugations simultaneously
US3406558A (en) * 1965-11-29 1968-10-22 Burndy Corp Crimping tool
US3641803A (en) * 1969-04-24 1972-02-15 Coq Nv Methods for the manufacture of a contact strip folded in zigzag for a fixed switching contact and folding machines for performing said methods
US3845654A (en) * 1973-07-13 1974-11-05 Caterpillar Tractor Co Die forming apparatus
US4943339A (en) * 1987-04-21 1990-07-24 Ethan Ernest Apparatus for manufacturing corrugated plywood composites
US20130255345A1 (en) * 2012-04-03 2013-10-03 Calsonic Kansei Corporation Fin processing apparatus
US9073110B2 (en) * 2012-04-03 2015-07-07 Calsonic Kansei Corporation Fin processing apparatus
US20130277884A1 (en) * 2012-04-18 2013-10-24 Medtronic Vascular, Inc. Method and apparatus for creating formed elements used to make wound stents
US9238260B2 (en) * 2012-04-18 2016-01-19 Medtronic Vascular, Inc. Method and apparatus for creating formed elements used to make wound stents
US9901973B2 (en) 2012-04-18 2018-02-27 Medtronic Vascular, Inc. Method and apparatus for creating formed elements used to make wound stents

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