US3570300A - Apparatus for ejecting articles in cold forming presses or the like - Google Patents

Apparatus for ejecting articles in cold forming presses or the like Download PDF

Info

Publication number
US3570300A
US3570300A US771917A US3570300DA US3570300A US 3570300 A US3570300 A US 3570300A US 771917 A US771917 A US 771917A US 3570300D A US3570300D A US 3570300DA US 3570300 A US3570300 A US 3570300A
Authority
US
United States
Prior art keywords
knockout
arm
link
connecting rod
lever
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 - Lifetime
Application number
US771917A
Other languages
English (en)
Inventor
Richard Schulte
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TH Kieserling and Albrecht GmbH and Co
Original Assignee
TH Kieserling and Albrecht GmbH and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by TH Kieserling and Albrecht GmbH and Co filed Critical TH Kieserling and Albrecht GmbH and Co
Application granted granted Critical
Publication of US3570300A publication Critical patent/US3570300A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/08—Accessories for handling work or tools
    • B21J13/14—Ejecting devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18056—Rotary to or from reciprocating or oscillating

Definitions

  • the connection between the knockout pins and the connecting rod comprises a first bell-crank lever one arm of which is coupled to the rod and the other armof which is connected to a first link in such a way that the axes of the other arm and the first link make an angle of at least 150 degrees in the starting position of the connecting rod, a second bellcrank lever one arm of which is coupled to the first link, and a second link which couples the other arm of the second lever with a common pusher for the knockout pins and whose axis is at least nearly parallel to the axis of knockout pins in starting position of the connecting rod.
  • Each knockout pin is adjustable axially with reference to the pusher.
  • the present invention relates to machine tools in general, and more particularly to improvements in cold forming presses or like machines wherein elongated articles which preferably consist of metallic material are shaped by forcing blanks or billets into the cavities of female dies or matrices and wherein the resulting articles must be forcibly expelled from such cavities.
  • the knockout pins or ejector pins are actuated by a push rod which is coupled to a bellcrank lever.
  • the latter is provided with a roller tracking a cam which is rotated by the main drive of the press. The pressure between the roller and the cam is very high so that such parts are subjected to excessive wear and must be replaced at frequent intervals.
  • the follower rolls along the inclined face of the wedge and, in order to insure the generation of a reasonably strong ejecting force, the inclination of the face on the wedge must change gradually during a first stage of movement and thereupon becomes more pronounced in order to avoid excessive strokes of the connecting rod.
  • the wedge is subjected to substantial lateral stresses which are transmitted to the knockout pin and, furthermore, the ejecting force decreases very pro- 3,570,300 Patented Mar. 16, 1971 nouncedly in response to relatively small increases in the stroke of the pin, i.e., in response to minor adjustments in the position of the wedge.
  • Another object of the invention is to provide an apparatus of the just outlined character which can be built into existing presses without necessitating extensive alterations in the design of such machines.
  • a further object of the invention is to provide an apparatus which can be utilized to actuate a single knockout pin or two or more knockout pins.
  • An additional object of the invention is to provide an apparatus which can be operated automatically by the main drive of a cold forming press or the like and wherein all necessary adjustments can be carried out by resorting to simple tools and by employing semiskilled persons.
  • the apparatus of my invention is used for expulsion of articles from the matrices of cold forming presses or analogous apparatus, particularly for expulsion of elongated metallic articles. It comprises a driving member which preferably constitutes a connecting rod of variable length and is reciprocable between first and second end positions which respectively correspond to retracted and operative positions of a knockout member or ejector member which is arranged to penetrate into or to be withdrawn from the cavity of a matrix, and motion transmitting means connecting the driver member with the knockout member.
  • the motion transmitting means comprises first and second two-armed levers which are pivotable about parallel axes making right angles with the directions of reciprocation of the driving member and knockout member, a pin articulately coupling one arm of the first lever with one end of the driving member, a first link articulately connecting the other arm of the first lever with one arm of the second lever in such a way that the axes of the link and of the other arm of the first lever make an angle of at least degrees in the first end position of the driving member, and a second link operatively connecting the other arm of the second lever with the knockout member in such a way that the axis of the second link is at least substantially parallel to the axis of the knockout member in the [first end position of the driving member.
  • the means for reciprocating the driving member preferably comprises a rotary cam which cooperates with a follower provided on one arm of a third two-armed lever whose other arm is coupled to the other end of the driving member.
  • the latters effective length can be regulated by a turnbuckle or the like.
  • the operative connection between one or more knockout members and the second link comprises a pusher or ejector bar which is threadedly connected with each knockout member.
  • Means is provided for rotating each knockout member with reference to the pusher to thereby select the initial positions of such knockout members independently of the stroke of the driving member.
  • the rotating means preferably comprises a separate worm drive for each knockout member.
  • FIG. 1 is a partly side elevational and partly vertical sectional view of an ejecting apparatus which embodies the invention
  • FIG. 2 is a front elevational view of the apparatus as seen in the direction of arrow X in FIG. 1, certain parts of the apparatus being shown in vertical section;
  • FIG. 3 is an enlarged substantially horizontal sectional view as seen in the direction of arrows from the line IIIIII of FIG. 1 and showing a slightly different apparatus with several knockout pins.
  • FIG. 1 illustrates an upright frame member 1 of a cold-forming press for metallic articles.
  • the upper end portion 1a of the frame member 1 supports a rotary camshaft 2 which is rigid with a cam 3 and is rotatable in a clockwise direction.
  • the means for rotating the camshaft 2 derives motion from the main drive (not shown) of the press and includes an intermediate gear 4 mounted in the frame member 1 and meshing with a gear 5 on the camshaft 2.
  • the just mentioned main drive of the press operates the ram (not shown) which in turn cooperates with a female die or matrix M to form enlongated shaped articles of relatively small diameter (as compared to their length).
  • the cam 3 on the camshaft 2 serves to reciprocate a driving member 8, here shown as a connecting rod, by way of a bellcrank lever 6, and the connecting rod 8 serves to operate a motion transmitting linkage which in turn reciprocates a knockout pin or ejector pin 13 serving to expel the articles from the cavity of the matrix M.
  • the lever 6 is pivotable on a pin 5a which is mounted in the frame member 1; the arm 6a of this lever carries a roller follower 7 which tracks the face of the cam 3, and the other arm 6b of the lever 6 is articulately connected with the adjoining upper end of the connecting rod 8 by a pin 7a.
  • the means for biasing the roller follower 7 against the face of the cam 3 comprises two fluid-operated cylinders 11, 11a mounted on the frame member 1 and having downwardly extending piston rods 10, 10a coupled to a crosshead 9 which is affixed to the connecting rod.
  • the pressure of fluid in the upper chambers of cylinders 11, 11a is selected with a view to insure that the roller follower 7 remains in continuous engagement with the cam 3.
  • the connecting rod 8 is of variable length and comprises two coaxial sections 8a, 8b coupled to each other by a turnbuckle 12 or analogous length adjusting means. Depending on the direction in which the turnbuckle 12 is rotated by the operator or by a mechanism (not shown), the effective length of the connecting rod 8 can be varied within a desired range to insure satisfactory expulsion of shorter or longer articles.
  • the lower end portion of the connecting rod 8 is articulately connected by a pin 14 to one arm 15a of a bellcrank lever 15 which is turnable on a pivot pin 14S aflixed to the frame member 1 or to another stationary part of the press.
  • the other arm 15b of the lever 15 is coupled to one end of a first link 18 by a pin 17.
  • the other end of this link is coupled to one arm 20a of a further bellcrank lever 20 by a pin 19.
  • the lever 20 is pivotable on a fixed pivot pin 21 and its other arm 20b is coupled to one end of a second link 22 by a pin 23.
  • the other end of the link 22 is coupled to a pusher or ejector bar 25 by a pin 24.
  • the pusher 25 resembles a nut and meshes with the externally threaded lower end portion 130 of the knockout pin 13.
  • the pusher 25 meshes with three knockout pins 13, 13a, 13b.
  • Each knockout pin is turnable with reference to the pusher 25, i.e., each of these pins is provided with a threaded end portion 13c, and each knockout pin is further provided with a pinion 26 which is non-rotatably received in an internally splined sleeve or socket 28 provided in a guide 27 which holds the sleeve against axial movement.
  • Each sleeve 28 is provided with a worm wheel 29 which meshes with one of three worms 30 provided on and rotatable relative to a shift 34.
  • Each worm 30 is rigid or integral with a bevel gear 31 meshing with one of three complementary bevel gears 32 provided on readily accessible spindles 33 shown in FIG. 3.
  • the spindles 33 can rotate the respective bevel gears 32 in a clockwise or in a counterclockwise direction.
  • the parts 2634 constitute a means for rotating the pins 13-13b and for thereby select ing the initial axial positions of these pins independently of each other.
  • the spindles 33 are readily accessible so that their exposed polygonal heads can be engaged by a suitable tool to effect appropriate adjustment in the initial position of corresponding knockout pins.
  • FIG. 1 illustrates the first end position or starting position of the connecting rod 8.
  • the camshaft 2 is driven in a clockwise direction and, when the follower 7 engages the lobe of the cam 3, it is caused to assume the phantomline position of FIG. 1 which corresponds to the second end position of the connecting rod 8.
  • the thus displaced follower 7 turns the lever 6 in a counterclockwise direction and the connecting rod 8 moves upwardly against the opposition of cylinders 11, 11a,
  • the unit including the lever 15 and link 18 changes its position to the extent determined by the extent of upward movement of the connecting rod 8.
  • the axes or longitudinal extensions of the arm 15b and link 18 make an angle of almost 180 degrees (see FIG. 1).
  • the ratio of the length of arms 26a, 20b of the lever 20 is selected in such a way that the apparatus can produce a very pronounced ejecting force which suflices to effect expulsion of an article from the matrix M.
  • the pusher 25 is subjected to negligible lateral stresses, mainly because the axis or longitudinal extension of the link 22 is substantially or exactly parallel to the axis of the pin 13 in the first end position of the connecting rod 8.
  • the angular position of the link 22 with reference to the axis of the pin 13 changes very little when the connecting rod 8 is caused to move toward its second end position.
  • the turnbuckle 12 is rotated in a direction to increase the overall length of the connecting rod 8.
  • the relative angular displacement of the arm 15b and link 18 depends on the stroke of the connecting rod 8.
  • the angle between the axes of the arm 15b and link 18 preferably at least equals or exceeds degrees. It is further clear that the ratio of the length of the arm 20a to that of the arm 20b can be varied within a certain range.
  • An important advantage of the just described apparatus is that it can produce highly satisfactory ejecting forces even when the pressure between the roller follower 7 and the face of the cam 3 is relatively low.
  • the force is multiplied by the parts 15, 18, 20 and 22, and such force is transmitted to the knockout pin or pins axially, i.e., with minimal lateral stresses.
  • Another important advantage of the apparatus is that the effective length of ejection strokes of all knockout pins can be varied simultaneously (by changing the effective length of the connecting rod 8) as well as individually by way of the spindles 33. Friction between the relatively movable parts of the motion transmitting means which moves the pusher 25 is much less than between the moving parts of conventional apparatus.
  • Still another advantage of the improved apparatus is that a single pusher 25 can operate one, two or more knockout pins without being subjected to appreciable lateral stresses.
  • the link 22 is preferably coupled to the pusher 25 in registry with the centrally located knockout pin 13 which is shown as being installed midway between the outer pins 13a and 13b.
  • Apparatus for expulsion of articles from the matrices of cold forming presses or analogous machines, particu larly for expulsion of elongated articles, comprising a driving member reciprocable between first and second end positions; a reciprocable knockout member; and motion transmitting means connecting said driving member with said knockout member so that the latter can expel an article from the associated matrix in response to movement of said driving member from first to second end position, said motion transmitting means comprising first and second two-armed levers, said first lever having one of its arms articulately connected to said driving member, a first link articulately connecting the other arm of said first lever with one arm of said second lever, and a second link providing an operative connection between the other arm of said second lever and said knockout member, the axis of said second link being substantially parallel to the axis of said knockout member in the first end position of said driving member.
  • said motion transmitting means further comprises a reciprocable pusher axially adjustably supporting said knockout member and articulately connected with said second link.
  • Apparatus as defined in claim 6, further comprising means for rotating said knockout member with reference to said pusher.
  • said last mentioned means comprises a rotary sleeve surrounding said knockout member, means provided on said sleeve and said knockout member to hold the latter against rotation with reference to said sleeve, and means for rotating said sleeve.
  • Apparatus as defined in claim 8, wherein the means for rotating said sleeve comprises a worm wheel rigid with the sleeve, a worm meshing with said worm wheel, and means for rotating said worm.
  • Apparatus as defined in claim 9, wherein the means for rotating said worm comprises a first bevel gear rigid with said Worm, a second bevel gear mating with said first bevel gear, and a spindle for rotating said second bevel gear in either direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
  • Forging (AREA)
US771917A 1967-11-09 1968-10-30 Apparatus for ejecting articles in cold forming presses or the like Expired - Lifetime US3570300A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK0063854 1967-11-09

Publications (1)

Publication Number Publication Date
US3570300A true US3570300A (en) 1971-03-16

Family

ID=7231325

Family Applications (1)

Application Number Title Priority Date Filing Date
US771917A Expired - Lifetime US3570300A (en) 1967-11-09 1968-10-30 Apparatus for ejecting articles in cold forming presses or the like

Country Status (10)

Country Link
US (1) US3570300A (fr)
AT (1) AT276022B (fr)
BE (1) BE712650A (fr)
CH (1) CH461232A (fr)
DE (1) DE1627684B1 (fr)
FR (1) FR1562526A (fr)
GB (1) GB1167474A (fr)
NL (1) NL6803740A (fr)
SE (1) SE333560B (fr)
YU (1) YU31447B (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911719A (en) * 1974-12-02 1975-10-14 Ragsdale Brothers Inc High speed ejector mechanism
US4161113A (en) * 1978-04-11 1979-07-17 The National Machinery Company Knockout adjustment mechanism for forging machines
US4283932A (en) * 1979-05-31 1981-08-18 Textron, Inc. Toggle-actuated punch stripper
US4926671A (en) * 1988-12-05 1990-05-22 Hill James B Press brake
CN108692905A (zh) * 2018-06-14 2018-10-23 明景泰 一种角度冲击装置
WO2019038786A1 (fr) * 2017-08-23 2019-02-28 Lokhande Shrikant Ensemble et procédé de fabrication automatisée d'anneaux
CN113290194A (zh) * 2021-05-24 2021-08-24 荣成华东锻压机床股份有限公司 锻造压力机杠杆式下顶料调整装置及方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3021790A1 (de) * 1980-06-11 1981-12-17 Peltzer & Ehlers Gmbh & Co, 4150 Krefeld Umformpresse zur herstellung von pressteilen
DE3322944A1 (de) * 1983-06-25 1985-01-10 Eumuco Aktiengesellschaft für Maschinenbau, 5090 Leverkusen Matrizenauswerfer-vorrichtung fuer mehrstufen-umformmaschinen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1412844A (en) * 1920-02-02 1922-04-18 Nat Machinery Co Electing attachment for heading machines
FR576818A (fr) * 1923-04-13 1924-08-27 Perfectionnements aux presses à étirer pour métal en feuilles
CH383167A (de) * 1960-06-13 1964-10-15 Smeralovy Z Narodni Podnik Auswerfvorrichtung für automatische Pressen, insbesondere für Stufenpressen

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911719A (en) * 1974-12-02 1975-10-14 Ragsdale Brothers Inc High speed ejector mechanism
US4161113A (en) * 1978-04-11 1979-07-17 The National Machinery Company Knockout adjustment mechanism for forging machines
US4283932A (en) * 1979-05-31 1981-08-18 Textron, Inc. Toggle-actuated punch stripper
US4926671A (en) * 1988-12-05 1990-05-22 Hill James B Press brake
WO2019038786A1 (fr) * 2017-08-23 2019-02-28 Lokhande Shrikant Ensemble et procédé de fabrication automatisée d'anneaux
CN108692905A (zh) * 2018-06-14 2018-10-23 明景泰 一种角度冲击装置
CN113290194A (zh) * 2021-05-24 2021-08-24 荣成华东锻压机床股份有限公司 锻造压力机杠杆式下顶料调整装置及方法
CN113290194B (zh) * 2021-05-24 2021-12-21 荣成华东锻压机床股份有限公司 锻造压力机杠杆式下顶料调整装置及方法

Also Published As

Publication number Publication date
YU31447B (en) 1973-06-30
FR1562526A (fr) 1969-04-04
SE333560B (fr) 1971-03-22
NL6803740A (fr) 1969-05-13
CH461232A (de) 1968-08-15
BE712650A (fr) 1968-07-31
DE1627684B1 (de) 1970-08-27
AT276022B (de) 1969-11-10
GB1167474A (en) 1969-10-15

Similar Documents

Publication Publication Date Title
US3299453A (en) Upsetting machine with controllable ejector means for the manufacture of screws, bolts, bolt blanks and the like
DE19521050C2 (de) Kniehebel-Antriebsvorrichtung
US3570300A (en) Apparatus for ejecting articles in cold forming presses or the like
US4044588A (en) High speed ball header
US2153839A (en) Metalworking
DE2503458A1 (de) Kniehebelpresse
DE19521049C2 (de) Kniehebelartiges Stanzenantriebssystem
NO130187B (fr)
US2738063A (en) Device for indexing the die apertures on extrusion presses
DE3806352A1 (de) Vorrichtung zum auswerfen von werkstuecken aus matrizen in einer umformpresse
US3929000A (en) High-speed short-stroke forging press
US3238761A (en) Machine for forming metal articles
US3572077A (en) Apparatus for a continuous swaging of rod-shaped workpieces
DE2827561C2 (de) Kurbelpresse mit stempelseitigem Auswerfer
US3452572A (en) High-velocity shearing machine
DE2132377C3 (de) Umformmaschine zum wahlweisen Pressen oder Schlagen
US3972670A (en) Press for making castings of powder or granular materials
US2271771A (en) Adjustable stroke press
US5031439A (en) Drive for a male-mold-side ejector slidably disposed in a slide of a metal-forming press
US3722253A (en) Double stroke-double blow header
US4014203A (en) Ejector mechanism for ejecting pressed parts from the bottom die of press
US4879893A (en) Multipurpose swaging machine
US1106571A (en) Tandem press.
EP0635320B1 (fr) Serre-flan pour presses à simple effet en particulier pour presses mécaniques et presses de transfert
US5065636A (en) Drive arrangement for a male-die-side ejector slidably disposed in a slide of a mechanical metal-forming press