US 3701275 A
A machine for making spacer-expanders for piston oil rings of the type described in United States Pat. No. 3,477,732. The machine comprises a punch press having a plurality of stations through which strip stock is fed progressively in accurately predetermined increments, the strip stock being worked between dies at each station to transform the strip stock into completed rings. The press includes one or more punching stations where the strip stock is pierced and blanked, one or more forming stations where the pierced and notched strip is bent to form the spring legs of the spacer-expander and then curled into a channel-shaped cross-section, a coiling station where the channel-shaped stock is fashioned into a coil, and a cut-off station where each coil is sheared from the strip to form the semi-finished ring. The press also includes a special transfer apparatus for transferring the semi-finished ring to a final work station wherein the end joints are trimmed and formed to final configuration, after which the finished rings are loaded automatically in stacked relation on a cylindrical mandril.
Claims available in
Description (OCR text may contain errors)
United States Patent Overway et al. 31, 1972  MACHINE FOR FORMING PISTON  ABSTRACT RING SPACER'EXPANDERS FROM A machine for making spacer-expanders for piston oil STRIP STOCK rings of the type described in United States Pat. No. 72 Inventors; R E, O G d H 3,477,732. The machine comprises a punch press hav- Frank win-rick Muskegon, both ing a plurality of stations through which strip stock is f'Mi lfed progressively in accurately predetermined increments, the strip stock being worked between dies at  Seal cm'pomtlon each station to transform the strip stock into Muskegon Mlchcompleted rings. The press includes one or more  Filed; May 2 7 punching stations where the strip stock is pierced and blanked, one or more forming stations where the  PP N 39,499 pierced and notched strip is bent to form the spring legs of the spacer-expander and then curled into a 52 US. Cl ..72/335, 29/l56.6 Channel-shaped cross-section, coiling Station Where 51 Int. Cl. ..B2ld 28/00, B23p /06 the channel-Shaped stock is fashimed a coil and 58 Field of Search ..72/324 335- 29/l56.6 a Statim where e is sheared from the strip to form the semi-finished ring. The press also includes a special transfer apparatus for transferring the  References Cited semi-finished ring to a final work station wherein the UNITED STATES PATENTS end joints are trimmed and formed to final configuration, after which the finished rings are loaded auto- Farmer ta k d l d a1 d 2,697,865 12/1954 Norton ..29/l56.6X c yms c 6 onacym Claims, 53 Drawing Figures Primary ExaminerCharles W. Lanham Assistant Examiner-R. M, Rogers Att0rneyBarnes, Kisselle, Raisch & Choate /60 m2 I64 00 [50 H6 H8 H6 H4 8 H6 [/6 I20 I26 4-- [08 I52 /04- /2e- 20: 3 /-3+ 904 I70 I56 Q 220 0,20 m 4/4 4 mmn'fi CoclfrCu'hOff a 2\\ 1J0 5/3 1 3 e s is (K. at 0 "n a m- 2 48 \fl my 0 ion T Stahon 'S'Tfon lmtlor| anon Stahon g 10 f-zoe 54 a a I 213 Stqhon 8 2 4 w gemie 1am; ea, t an, "ear a; at?
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BY FRANK .WARRICK mfll mw ATTORNEYS 4M MACHINE FOR FORMING PISTON RING SPACER- EXPANDERS FROM STRIP STOCK This invention relates generally to a punch press and particularly to an apparatus for punching metal in the form of a strip and forming such punched strip into rings.
More specifically, the invention relates to an apparatus for progressively forming in a continuous operation a flat ribbon metal strip into spacer-expander spring rings of the type commonly located between thin metallic rails in the oil groove of a piston of an internal combustion engine.
An object of this invention is to enable production of such rings accurately, economically and at a high rate.
Another object is to provide an improved machine capable of automatically forming spacer-expanders of the type disclosed in U.S. Pat. No. 3,477,732, particularly in connection with FIGS. 1-5 inclusive and FIGS. 15 and 16 thereof.
A further object is to provide an improved machine capable of performing the improved method of making such a spacer-expander as disclosed in a co-pending application of Frank G. Warrick, Ser. No. 39,264, filed May 21, 1970, entitled Method of Forming a Spacer- Expander, and assigned to the assignee of the present application.
A further object is to provide an improved machine of the above character utilizing certain components and functions of the machine disclosed and claimed in U.S. Pat. No. 2,925,847, assigned to the assignee of the present application, and to improve upon said prior machine.
Other objects, features and advantages of the apparatus of this invention will become apparant from the following detailed description and accompanying drawings wherein:
F IG. 1 is a fragmentary front elevational view of an exemplary but preferred embodiment of the machine of the present invention.
FIGS. 2, 3 and 4 are fragmentary plan views of the strip stock respectively showing the operations performed thereon at the first, second and third punching, blanking and bending stations of the machine.
FIG. 5 is a fragmentary perspective view of the strip stock illustrating the feet and leg bending operations performed thereon successively at stations Nos. 3 and 4 respectively.
FIG. 6 is a fragmentary view partially in vertical elevation and partially in vertical center section through the strip guide infeeding mechanism and leg bending dies of station No. 4.
FIGS. 7 and 8 are fragmentary end elevational and part vertical sectional views taken generally on the line 7-7 of FIG. 6 and respectively illustrating the dies of station No. 4 in their open and closed positions.
FIG. 9 is a fragmentary plan view of the strip infeed guide of station No. 4
FIGS. 10 and 11 are fragmentary enlarged views of the dies as viewed in FIGS. 7 and 8 respectively.
FIG. 12 is a fragmentary front elevational view showing a portion of the die structure shown in FIG. 6 but enlarged thereover and with the dies in closed position.
FIG. 13 is a vertical sectional view taken on the line 13-13 of FIG. 5 but enlarged thereof:
FIG. 14 is a fragmentary front elevational view of the dies of station No. 5 shown partially in vertical center section and with the dies closed.
FIG. 15 is a fragmentary end elevational view of the entrance to station No. 5 taken on the line 15-15 of FIG. 14.
FIG. 16 is a fragmentary vertical sectional view taken on the line 16-16 of FIG. 21 and illustrating the progressive strut bending operation being simultaneously performed by the last sevenof the ten punches and associated dies of station No. 5.
FIGS. 17, 18, 19, 20 and 21 are fragmentary vertical sectional views taken respectively on the line 17-17 of FIG. 14 and lines 18-18, 19-19, 20-20 and 21-21 of FIG. 16.
FIG. 22 is a vertical sectional view taken on the line 22-22 of FIG. 16 illustrating the finished cross-sectional contour of the strip as it emerges from station No. 5.
FIG. 23 is a fragmentary horizontal sectional view taken on the line 23-23 of FIG. 14 illustrating the stationary stripper components in the lower die shoe of station No. 5.
FIG. 24 is a fragmentary horizontal plan view of portion of the structure shown in FIG. 23 with the stationary stripper parts removed to better illustrate the underlying movable stripper and stationary forming dies in the lower die shoe.
FIGS. 25, 26 and 27 are fragmentary vertical sectional views taken respectively on the lines 25-25, 26-26 and 27-27 of FIG. 14.
FIG. 28 is a fragmentary perspective view of the lefthand stripper plate of station No. 5 shown by itself.
FIG. 29 is a fragmentary front elevational view of a portion of the induction heating coil of station No. 6 and also illustrating the coiling and cut-off apparatus of station No. 7 of the machine.
FIG. 30 is a fragmentary front elevational view of the components of station No. 7 with the guide shield and blow-off air tube parts removed to better illustrate details.
FIG. 31 is a fragmentary end elevational view of the entrance guide of station No. 7 looking in the direction of arrow 31 in FIG. 30.
FIG. 32 is a fragmentary vertical sectional view taken on the line 32-32 of FIG. 30.
FIG. 33 is a fragmentary vertical sectional view taken on the line 33-33 of FIG. 30.
FIG. 34 is a fragmentary plan view of the strip stock after it has been severed in the cut-off operation of station No. 7.
FIG. 35 is a fragmentary front elevational view of a portion of station No. 7 illustrating the strip coiling anvil and associated bending pad in the open position thereof.
FIG. 36 is a fragmentary end elevational view of actuating linkage in station No. 7 as viewed on the line 36-36 of FIG. 30.
FIG. 37 is a fragmentary front elevational view of the apparatus of stations Nos. 8 and 9 of the machine.
FIG. 38 is a fragmentary front elevational view of a portion of the station No. 8 apparatus shown in FIG. 37 but illustrating the pusher members in closed position embracing the entrance cone of this station.
FIG. 39 is a side elevational view of the apparatus of station Nos. 8 and 9.
FIG. 40 is a fragmentary horizontal sectional view taken on the line 40-40 of FIG. 37 illustrating a portion of the apparatus of station No. 9.
FIG. 41 is a horizontal sectional view taken on the line 4141 of FIG. 37.
FIG. 42 is a horizontal sectional view taken on the line 42-42 of FIG. 37.
FIG. 43 is a fragmentary horizontal section of the shot pin and slide parts of FIG. 42 but with the shot pin shown in engaged position with the slide.
FIG. 44 is a fragmentary side elevational view illustrating the punch, clamp and die components of station No. 8, FIG. 44 being partially taken in vertical center section and enlarged over FIG. 39.
FIG. 45 is a fragmentary vertical sectional view taken on the line 45-45 of FIG. 44.
FIG. 46 is a fragmentary horizontal sectional view taken on the line 46-46 of FIG. 44 but greatly enlarged thereover.
FIG. 47 is a fragmentary vertical sectional view taken on the line 47-47 of FIG. 46.
FIG. 48 is a fragmentary plan view of a portion of the parts shown in FIG. 46 but with their position changed to illustrate the joint trimming and initial bending actron.
FIG. 49 is a view similar to FIG. 48 showing the parts at the completion of the trim and bending stroke.
FIG. 50 is a fragmentary side elevational view of the left-hand clamp member shown in FIGS. 46, 48 and 49.
FIG. 51 is a fragmentary side elevational view of the right-hand shearing and bending punch shown in FIGS. 46, 48 and 49.
FIG. 52 is an end elevational view of the left-hand forming die shown in FIGS. 46, 48 and 49.
FIG. 53 is a fragmentary perspective view of one end of the spacer-expander illustrating the 'end joints thereof after being trimmed and bent in station No. 8.
For purposes of facilitating description and not by way of limitation, the machine 100 of the present invention is illustrated with the proper dies for forming the piston ring spacer-expander illustrated in the aforementioned U.S. Warrick Pat. No. 3,477,732, particularly the spacer-expander 58 shown and described in conjunction with FIGS. 1-5 inclusive thereof and with the end joint construction shown and described in conjunction with FIGS. 14-16 inclusive thereof, this patent being incorporated herein by reference and hence spacer-expander 58 thereof not being described herein.
GENERAL ARRANGEMENT Machine 100 of the present invention is shown substantially in its entirety in FIG. 1 and generally consists of a punch press similar in part to that shown, described and claimed in the aforementioned U.S. Burns et al Pat. No. 2,925,847, which is incorporated herein by reference for a detailed disclosure of certain portions of the machine identified in more detail hereinafter. Machine 100 has a base 102 which supports a frame 104 and a motor 106 on frame 104 which drives a flywheel 108 through a belt 110. Flywheel 108 is connected by a clutch 112 with the crankshaft 1.14 of the press. Clutch 112 is of the positive drive, electric throw-out type. Shaft 1 14 is journalled on the frame of the machine in bearings 116. A pair of magnetic brakes 118 are arranged around shaft 114 and when electrically energized operate to sieze shaft 114 when the circuit to the brake is closed. Shaft 114 has three crank portions to which the upper ends of connecting rods 120, 122 and 124 are individually pivotally connected. Rods 120, 122 and 123 are connected respectively at their lower ends to associated rams 126, 128 and 130 which are guided for vertical reciprocating movement on frame 104 in ways formed in three sets of guide plates 132, 133 and 134 respectively.
As set forth in more detail hereinafter, ram 126 operates a piercing die assembly 136 of station No. 1 and a blanking and notching die assembly 138 of the station No. 2. Ram 128 operates a foot bending and joint notching die assembly 140 of station No. 3 and a leg bending die assembly 142 of station No. 4. Ram 130 operates a strut bending and strip curling die assembly 144 of station No. 5 and, also, through-a linkage 804, operates a coiling and cut-off die assembly 146 of station No. 7. The end joint trimming and bending die assembly 148 of station No. 8 is powered by pneumatic rams synchronized with the operation of the press by a suitable counting and control mechanism as described in more detail hereinafter.
The end of shaft 114 remote from flywheel 108 carries a disc 150 to which a link 152 is eccentrically connected for driving a strip feeder 154 through a bell crank 156. A suitable commercially available magnetic pick-tip assembly is provided for counting revolutions of shaft 114 to develop one signal per each vertical reciprocation of the rams 126, 128 and 130 through their simultaneous mechanically synchronized working strokes. Pick-up 160 has a rotating part 162 secured to shaft 114 for rotation therewith and a stationary part 164 secured to the stationary structure of the end bearing 116. Pick-up 160 provides the input signal to a suitable counter control (not shown), such as that sold under the trademark DYNAPAR made by the Louis Allis Division of Litton Industries at the Digital Center in Gurnee, Illinois and identified as a Digital Process Controller Type 5X2-5 8-X-l This controller operates through the signals derived from pick-up- 160 to initiate the cut-off operation as well as the air blast at station No. 7. This occurs in response to an output signal developed by storing the number of counts in the digital memory of the controller corresponding to the number of increments of advance of the strip being worked in machine 100 required to pass a given length spacer-expander through the coiling die of station No. 7. Also, this control further provides an output signal for actuating the pusher fingers of station No. 8 after allowing a time delay (corresponding to a given number of counts) for the severed spacer-expander to drop onto the nose cone of station No. 8. The remaining motions in stations Nos. 8 and 9 are controlled by conventional limit switches and solenoid valve circuitry (not shown) associated with the moving parts of this station as described in more detail hereinafter.
The counter control is also adapted to generate a control signal for causing a transverse shuttle motion of die assemblies 136, 138 and 140 of stations Nos. 1, 2 and 3 as an end joint zone of the strip stock being fed therethrough comes into successive registry with the respective die assemblies, as set forth in more detail hereinafter.
In general, the operation of machine 100 is as follows: