US3817070A

US3817070A - Machine for non-cutting forming of metals

Info

Publication number: US3817070A
Application number: US00294718A
Authority: US
Inventors: E Ribback
Original assignee: Individual
Current assignee: Individual
Priority date: 1971-10-05
Filing date: 1972-10-03
Publication date: 1974-06-18
Anticipated expiration: 1991-06-18
Also published as: ES407289A1; JPS4872772A; FR2156034A1; AT320381B; LU66214A1; FR2156034B3; CA967792A; GB1395732A; DE2149577A1

Abstract

A machine for the non-cutting forming of metal in a hammer forging machine having a feed device for rotatingly feeding the material to the machine, in which clamping means is mounted on the machine frame and coordinated with the hammer machine, and is alternately driven by a hyraulically and mechanically acting mechanism towards the tools of the machine.

Description

United StatestPatent 1191 1111 3,817,070 Ribhack 1451 June 1s, 1974 MACHINE FOR NON-CUTTING FORMING 774.087 11/1904 Layboume et al 72/252 01; METALS 1,767,810 6/1930 Place 72/252 [76] Inventor: Erich Ribback, Maximiner Acht 39.

5 Trier Germany Primary ExaminerL0well A. Larson Oct. 3 1972 141107718), Agent, 0! FirmAllison COllZll'd [2]] Appl. N0.: 294,718

' 57 ABSTRACT [30] Foreign Application Priority Data 1 Oct. 5, 197] Germany 2149577 A machine the non-cutting forming of metal in a hammer forging machine having a feed device for ro- [52] US. Cl. 72/76, 72/402 tafingly feeding the material tothe machine, in which [51 Int. Cl B21 13/10 clamping means is mounted on the machine fra an Fleld of Search...; oordinated the hammer machine and is alter- 1 1 nately driven by a hyraulically and mechanically actl References Cited ing mechanism towards the tools of the machine.

UNlTED STATES PATENTS 664,435 12/1900 Roberts 72/76 8 Claims, 1 Drawing Figure 5 "E 1 9 a 10 9 1 5 1]. I 2o 13 12 7 21 -1 1 I" a 2 A:

I 17 II- I A I 111 I 3 11 HI P r* l 5 1 1 11 1 v z 1 22 1.1 1 ll/ 'F l9 l 1 j MACHINE FOR'NON-CUTTING FORMING or METALS In such machines, the combined effect of the hamimpair any hammering orupsetting forming operation.

An object of the invention is the elimination of such recoil during hammering or upsetting metal forming as much as possible, i.e., recoil acting in opposite direction to the material feed. Accordingly, the present invention provides a rotatable clamping means mounted on the machine frame, and coordinated with the hammer machine, which is driven alternately toward the tools by a hydraulically and then a mechanically driven feed mechanism. I

Other objects andfeatures of the present invention will become apparent from the following detailed description when taken in connection with the accompanying drawing which discloses an illustrative embodiment of the invention. It is to be understood that the drawing is designed for the purpose of illustration only, and is not intended as a definition of the limits and scope ofthe invention.

' Turning now to the drawing, there is shown a machine for the non-cutting forming or shaping of metals which comprises a hammer forging machine 1 provided with impact tools 2. An clamping means 4 is coordinated with the hammer machine 1, 2, on the machine frame 3 and is driven alternately toward the tools by a hydraulically and mechanically operating feed mechanism. In order to provide an upsetting forming operation and a rotating material feed, clamping means 4, which is driven by the hydraulically and alternately mechanically working feed mechanism, comprises a clamping device 5 which holds the material to be fed, and is equipped with a motor-driven rotating device 6. The mechanically acting feed mechanism, in its interior, is designed as a hydraulically acting feedmechanism. The mechanically acting feed mechanism consists of a hollow, non-revolving, axially movable spindle 7 having a threaded exterior portion which engages the internal threads a rotatably driven and frontally supported adjustment collar 8. This adjustment collar 8, in its housing 9, is frontally supported by thrust bearing 10 and rotatably mounted thereon. The rotary drive for the adjustment collar 8 is derived from a motor-driven chain drive 11. The plunger or piston 12 of a tubular piston rod 13 slides along the cylindrical interior wall of the hollow threaded spindle 7. The bar or rod stock is guided towards the hammer unit 1,2 by means of the Y tubular rod. At the end of its forward or feed stroke,

which is designed for rapid motion, the hydraulically

acting feed mechanism

12,13 is disconnected and blocked in the cylindrical threaded spindle 7, as well as rigidly connected with the mechanically acting feed device 7 11 which, at that moment is engaged. This causes the mechanically acting mechanism 7 11 to axially displace the rotatably driven clamping means 4 6,'over the

hydraulic drive

7,12,13, against the hammering device 1,2. A switch mechanism, for the disento flow into spindle cylinder 7, thus pushing the piston gagement of the hydraulically

acting feed mechanism

7,12,13 whereby a blocking effect is attained and its rigid connection to the engaged mechanically acting feed mechanism7 1l,is depicted schematically in the drawing.

In the hollow spindle cylinder 7, at both sides of the plunger 12, there are feed and

drain ducts

14 and 15 for a hydraulic pressure agent, which lead towards a pump 16. Pump 16 is reversible to provide alternate generation of a high or low pressure, i.e., a superatmospheric pressure and a vacuum. In duct 15 there is a spring-loaded and, manually operated valve 17 which blocks the flow-back of the pressure fluid from spindlecylinder 7 to pump 16. A branch duct 18 leads from duct 15 to a r'eversible electric switch 19 for reversible motor drive 22 for rotary drive 8 11 of adjustment collar 8, and its housing 9 is rigidly mounted on the machine frame.

In the initial stage of a metal forming operation, a machine equippedaccording to the present invention is in the position shown in the drawing. Mechanical drive 11,12 for adjustment collar 8 is'disengaged, so

that the hollow, cylindrical threaded spindle cannot be Y shifted axially. Pump 16 isswitched to generate pressure. This causes the valve to open and pressure fluid or plunger forward, whereby hollow piston rod 13, in rapid motion, moves or transports clamp carrier means 4 into operational position in front of hammermachine 1,2. The air present at the side or the piston which isnot under pressure, thus, can escape through I duct 14 from the spindle cylinder.

hydraulically acting

feed mechanism

12,13 is disengaged and blocked in spindle cylinder 7, since a backward flow of the pressure fluid from pressure chamber 21 through the closed valve is impossible. At this point, the mechanically acting drive for the rotary feed of the material (bar stock) is operative with rotary drive 4,5,6

of the clamping means during non-cutting metal forming, so that recoils from the clamping means are absorbed and neutralized by adjustment collar 8.

When the metal forming operation is completed, valve 17-is locked in its open position and pump 16 is reversed so as to generate low pressure (partial vac uum). The partial vacuum generated via opened duct 15 in pressure chamber 21 and branch duct 18 causes hydraulically acting

feed mechanism

12,13 to return to its initial position and to reset electric switch 19, so that mechanically acting feed mechanism 7 11 and 22 moves back to its starting position. It is expedient that, for the interruption of the material feed during the striking power stroke of the tools, a conventional friction or similar clutch is provided between clamping device 4,5 and its rotary drive 6. This guarantees that the quality of the-metal forming during rotary material feed is not impaired.

While only a single embodiment of the present inven- 2 tion has been shown and described, it will be obvious to those persons skilled in the art that many changes and modifications may be made thereunto without dea parting from the spirit and scope .of the invention.

What is claimed is:

1. in a machine for feeding metal stock to a hammer forging device the improvement which comprises in combination:

a clamping means for gripping said metal stock and coupled to a combination hydraulic and mechanical drive mechanism adapted to provide reciprocating motion of said clamping means relative to said forging device and comprising a screw spindle feeder, and

a hydraulic feeder capable of rapid motion and provided with a blocking means for blocking the hydraulic feeding action and rigidly connecting said screw spindle feeder to said clamping means at the'end of the forward stroke of said hydraulic feeder.

2. A machine according to claim 1 in which said drive mechanism is equipped with automatic means for blocking the hydraulic feeding action and substantially simultaneously activating the screw spindle feeder.

3. A machine according to claim 1 in which movable elements of said hydraulic feeder are located inside said screw spindle feeder.

4. A machine according to claim I in which said screw spindle feeder comprises anonrotatable, axially displaceable spindle having an external thread engaging an internal thread of a rotatable driving and adjusting collar mounted in a stationary housing.

5. A machine according. to claim 3in which said clamping means is connected to a piston rod of a hydraulic piston slidable mounted within a hollow spindle of said screw spindle feeder.

6. A machine according to claim 1 in which a motor drive means is provided for rotating said clamp means.

7. A machine according to claim 6 in which the rotary drive means is provided with a friction clutch for interrupting rotation of said stock during hammer strokes of said forging device.

8. A machine according to claim 2 in which said clamp means is connected to a piston rod attached to a hydraulic piston slidably mounted inside a nonrotatable hollow spindle of said screw spindle feeder and said spindle is axially displaceable by means of an external thread thereon engaging the internal thread of a driving and adjusting collar supported within a stationary housing.

Claims

1. In a machine for feeding metal stock to a hammer forging device the improvement which comprises in combination: a clamping means for gripping said metal stock and coupled to a combination hydraulic and mechanical drive mechanism adapted to proVide reciprocating motion of said clamping means relative to said forging device and comprising a screw spindle feeder, and a hydraulic feeder capable of rapid motion and provided with a blocking means for blocking the hydraulic feeding action and rigidly connecting said screw spindle feeder to said clamping means at the end of the forward stroke of said hydraulic feeder.

4. A machine according to claim 1 in which said screw spindle feeder comprises a nonrotatable, axially displaceable spindle having an external thread engaging an internal thread of a rotatable driving and adjusting collar mounted in a stationary housing.

5. A machine according to claim 3 in which said clamping means is connected to a piston rod of a hydraulic piston slidable mounted within a hollow spindle of said screw spindle feeder.