DE1270934B - Shearing device on upsetting presses for bolts u. like - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

B21k

German class: 49i-4

Number: 1 270 934

File number: P 12 70 934.1-14

Filing date: February 6, 1961

Opening day: June 20, 1968

The invention relates to a shearing device on upsetting presses for bolts and the like.

There are known shearing devices in which the wire is moved by a linearly moving cutter cut off and use the shear knife and a wire clamp by continuing the rectilinear movement of the shear knife is guided in front of the first die or upsetting die. With a modification With such a device, the operations remain the same, but the movement occurs on an arc of a circle. The use of such a vibrating cutter is special Advantage of a considerably smaller mass movement.

However, shearing off the material using this method never results in a completely flat one and right-angled cut surface, but this is always slightly oblique to the workpiece axis, so that in In many cases, reworking of the end face of the shaft is necessary.

A shearing device on upsetting presses for bolts and the like is also known, consisting of a stationary shear die and a movable shear knife, the two-part one as the actual one Shear knife and is designed as an associated counter holder and both of them together during the as Shear phase can be moved in a straight line, as well as a conveyor to the first die.

In a device of this type, the wire section is clamped during the cutting process, cut off and pressed into the conveyor designed as a gripper, which is then on a Arc moves downwards so that the wire section is in front of the first die or upsetting die to be led. With such a device a very straight and smooth cut can be obtained, however, the additional conveyor in the form of the gripper is required.

In contrast, a shearing device of the last-mentioned type according to the invention is characterized characterized in that the actual shear knife is designed as a double arm lever that on the shear side of the double-arm lever retaining springs are arranged that the double-arm lever is articulated at the inflection point stored and connected to a known linear drive, and that the the end of the double arm lever opposite the shear side is articulated with a swivel drive is.

In a shearing device according to the invention, no additional conveying device needs to be provided for transferring the sheared wire section to the first die, so that the shearing device can be used on upsetting presses
for bolts and the like

Applicant:

Textron Inc., Providence, R. I. (V. St. A.)

Representative:

Dr. E. Wiegand and Dipl.-Ing. W. Niemann,
Patent Attorneys, 2000 Hamburg 50, Königstr. 28

Named as inventor:

Herbert Leavenworth Hoyt, Waterbury, Conn.

(V. St. A.)

Claimed priority:

V. St. v. America 9 February 1960 (7703)

overall design becomes easier. In addition, the advantage of the considerably smaller mass movement is retained, which is present in known shearing devices in which the movement of the parts of the Shearing device takes place on an arc of a circle.

The invention is described below with reference to the single figure of the drawing, for example, which shows a partial cross-section of a compression molding machine equipped with a shearing device according to the invention is provided.

The molding press has a machine frame 10 in which a mold block 26 is mounted, in which there are matrices 27 and 28 which work together with corresponding punches (not shown). In the mold block 26, a shear die 29 is also stored, which has an opening 30, through which wire material to be processed in the molding press is fed will.

The rod or wire-like stock material from which the workpieces are formed can be used with advanced through opening 30 to cutting die 29 by any suitable advancing device will. In front of the end face of the die 29 there is a device for shearing off a Workpiece. A sleeve 73 firmly connected to the machine frame 10 is used to slide it back and forth Storage of a rod 74 which, at its lower end, has a shear knife serving as a counter holder 75 carries, in which there is a recess 76

809 560/104

is located, which may include the wire material. In the rod 74 there is a recess 77 in which engages the nose part 78 of a lever 79 mounted at 80 on a second lever 81. This second one The lever is in turn mounted at 82 on the machine frame 10.

A headed bolt 83 is slidably inserted into the bore 84 of the lever 79. Of the Bolt 83 also passes through lever 81, on the rear of which the bolt head 85 rests comes. A compression spring 86 surrounding the bolt pushes the end 84 of a lever 79 from the lever 81 so that these two levers are normally held in the position shown.

On the far end of the lever 81 is a cam follower 88 which cooperates with a cam 89 attached to a shaft 90. The shaft 90 is driven by the engine's crankshaft. The cam follower roller is pressed against the cam with the aid of a spring-loaded bolt 93. The bolt 93 is supported on a compression spring 94 which is located in a housing 95 which is fastened to the machine frame 10 with a bracket 96. As a result of this arrangement, the movement of the counter knife 75 is controlled by the shape of the cam 89. The spring 86 enables the lever 81, however, to move in a direction independently of the counter knife 75, so that the overstroke of the lever 81 is accommodated Machine frame 10 arranged lever 120 is attached. This lever 120 is provided with a plate 122 into which adjusting screws 123 are screwed, which act on the lower edge of an arm 124 which carries a cam follower roller 125. The cam follower roller 125 works together with a cam 126 which is also mounted on the shaft 90. With the aid of a bolt 129, a second arm 127 is attached to one eye 128 of the arm 124 in such a way that the arms 124 and 127 form a rigid whole. The arm 127 carries a cam follower roller 130 which cooperates with a cam 131. As a result of this design, the arms 124 and 127 are rigidly connected to the lever 120, but adjustable as a result of the screws 123, so that the latter can inevitably be pivoted around the center of gravity 121 in a clockwise direction and also in an anti-clockwise direction. As a result, the double-arm lever 101 also swings about its pivot point 102 and moves the cutting knife 100 essentially in the horizontal direction, while the lever 101 is moved by the arm 103 essentially in the vertical direction. This movement of the lever 101 and the associated cutting blade 100 results in a composite movement which is partly in the vertical direction and partly controlled by the lifters 103 and 120 in FIG

can be when the counter knife 75 runs with the 30 horizontal direction.

Wire material engages. When a length of stock is fed,

With the counter knife 75 a shear knife 100 works together, which at the upper end of a Double arm lever 101 is provided. This double

arm lever 101 is mounted in its center at 102 on a second lever 103, which in turn at 104 is pivotably connected to the machine frame 10. In addition to the cutter 100 are retaining springs provided in the form of spring fingers 105, which grasp the workpiece after shearing, so that the cutter 100 moves. can be in order to move the workpiece to the adjacent first die 27 convict.

The lever 103 is forcibly operated in both directions. For this purpose, the lever 103 provided with an arm 107 which carries a cam follower roller 108 which is provided with a cam 109 the shaft 90 cooperates. This cam 109 tends to move the lever 103 about its pivot point to pivot clockwise. To move the lever 103 in the other direction is a second lever 110 is provided, which is also pivotably arranged at 104 on the machine frame 10 and a predetermined breaking plate 111 carries with which a screw 112 is in engagement. The screw 112 is screwed adjustably in an arm 113 of the lever 103. This arm 113 is continued by a Arm 114 of the lever 110 is applied. The lever 110 is provided with a cam roller 115 with a on the shaft 90 mounted cam 116 cooperates.

With the above arrangement, it is possible to move the lever 103 by means of the cams 109 and 116 in both To move directions, whereby the bearing point 102 of the double arm lever 101 is changed, which carries the actual cutter 100.

The double arm lever 101 works with a compound movement. At the lower end of the, the shear blades 100 and 75 expose the opening 30 of the shear die 29, the shear blade 100 being below and the counter knife 75 above the opening 30. At the beginning of a work cycle of the machine, the lever 79 moves the counter knife 75 down until it rests on the stock material. The lever 103 is operated in such a way that it moves the cutting knife 100 upwards until it acts on the underside of the stock material. As soon as the stock material is gripped by these two knives 75, 100, both knives 75 and 100 move upwards far enough to shear off a workpiece from the stock material. The counter knife 75 moves into the position shown above. This movement of the counter knife 75 is brought about by the spring 94, which presses the roller 88 against the cam 89, the counter knife 75 being moved upwards far enough to clear the opening 30. The sheared workpiece W is then gripped by the spring fingers 105. The lever 120 is now actuated by its control cams acting on the cam follower rollers 125 and 130 in order to pivot the double-arm lever 101 about its pivot point 102 in such a way that the workpiece W is moved over a path denoted by α. The workpiece W now moves into a position opposite the opening of the die 27. The shearing knife 100 is now guided downwards via the path b and then laterally via the path c into the starting position, in which a further section of the stock material is then passed through the opening 30 can be fed for shearing. It can thus be seen that the two shear blades 75 and 100 move first in opposite directions towards the projecting end of the stock material and then up in the same direction, with the counter blade 75 moving one way

Moved greater distance in order to get free from the workpiece held in the spring fingers 105. The lever 101 then carries the workpiece to the die 27 and is then moved back to the starting position.

Claims (1)

Claim: Shearing device on upsetting presses for bolts and the like, consisting of a stationary shear die and a movable shear blade, which is designed in two parts as the actual shear blade and as an associated counter-holder and both of which can be moved in a straight line during the shear phase, as well as a conveyor to the first die in that the actual cutting blade is designed as a double-arm (101), -that on lateral shearing of the double (101) retaining springs (105) are arranged so that the twin-arm (101) is articulated at the inflection point and is connected to a per se known Geradführungsantrieb and that the end of the double-arm lever (101) opposite the shear side is connected in an articulated manner to a pivot drive (119, 120, 125). Considered publications:
German Patent Nos. 443 991, 326 294;
U.S. Patents Nos. 2254 316, 2138 488, 856 028;
Book by J. Billigmann on »Upsetting and Press, 1953, Carl Hanser Verlag Munich, pp. 258 to 260. 1 sheet of drawings