DE1815691B2

DE1815691B2 - Billet or section steel shears with a section holder

Info

Publication number: DE1815691B2
Application number: DE19681815691
Authority: DE
Inventors: Joachim 5820 Gevelsberg Wepner
Original assignee: FA PAUL FERD PEDDINGHAUS 5820 GEVELSBERG
Current assignee: FA PAUL FERD PEDDINGHAUS 5820 GEVELSBERG
Priority date: 1968-12-19
Filing date: 1968-12-19
Publication date: 1974-02-14
Also published as: DE1815691C3; DE1815691A1

Description

1 8151 815

Auf der Zeichnung ist ein Ausführungsbeispiel nach der Erfindung dargestellt, und zwar zeigtIn the drawing, an embodiment according to the invention is shown, namely shows

F i g. 1 eine Seilenansicht des Abschnittshalters, F i g. 2 einen Schnitt undF i g. 1 is a cable view of the section holder, F i g. 2 a section and

F i g. 3 einen schematischen Aufbau der Steuerung des Abschnitthälters der Schere.F i g. 3 shows a schematic structure of the control of the section holder of the scissors.

In Bewegungsrichtung des Werkstücks Sch vor dem Scherenrahmen 1 ist an diesem ein Gegenhalter 2 angeordnet, durch den der vor dem Scherenmaul M gelegene Werkstückabschnitt gehalten wird. In dem Scherenrahmen 1 ist das feststehende Messer 3 in bekannter Weise angebracht, dem in seiner Ausgangsstellung schräg gegenüber das bewegliche Messer4 an einem Schlittens od. dgl. angeordnet ist. In dem gezeigten Beispiel haben die Messer halbkreisförmige Schneidflächen; die jeweiligen Vorderkanten der Messer tragen die Bezugszeichen 3' und 4'.In the direction of movement of the workpiece Sch in front of the scissors frame 1, a counter holder 2 is arranged on the latter, by means of which the workpiece section located in front of the scissors mouth M is held. In the scissors frame 1, the fixed knife 3 is mounted in a known manner, which in its starting position is arranged obliquely opposite the movable knife 4 on a carriage or the like. In the example shown, the knives have semicircular cutting surfaces; the respective leading edges of the knives bear the reference numerals 3 'and 4'.

Dem beweglichen Messer 4 liegt horizontal ein Zylinder 6 am Scherenrahmen 1 gegenüber, dessen Zy-Iinderraum7 mit einer Druckmittelleitup^8 verbunden ist und der einen Kolben 9 aufnimmt, an dessen Vorderseite, d. h. an der dem Scherenmesser 4 gegenüberliegenden Seite der Abschnittshalter 10 befestigt ist. Beim Beaufschlagen des Kolbens 9 mit einem entsprechenden Druckmittel, wird der Abschnittshalter 10 in seine Stellung 10' bewegt, in welcher er an dem abzutrennenden Abschnitt 11 des Werkstücks Sch Anlage findet.The movable knife 4 is horizontally opposite a cylinder 6 on the scissors frame 1, the cylinder chamber 7 of which is connected to a pressure medium pipe 8 and which receives a piston 9, on the front of which, ie on the side opposite the scissor knife 4, the section holder 10 is attached. When a corresponding pressure medium is applied to the piston 9, the section holder 10 is moved into its position 10 ', in which it abuts the section 11 of the workpiece Sch to be separated.

Der Abschnittshalter 10 trägt eine Stange 12, die jü in einen Ansatz 13 des Zylinders 6 gleiten kann und deren eines Ende mit einem Gewinde 14 versehen ist, e ne Mutter 15 verstellbar ist, die eine Anhe 16 bildet. Diese Anschlagstein 16 wirkt mit dem Kontakt 16 β eines Steuerventils 29 zusammen, das mit der Kupplung des Scherenschlntens des beweglichen Messers 4 verbunden ist.The section holder 10 carries a rod 12, the jü can slide into a projection 13 of the cylinder 6 and one end of which is provided with a thread 14, e ne nut 15 is adjustable, which is an attachment 16 forms. This stop block 16 interacts with the contact 16 β of a control valve 29 together, that with the coupling of the scissors cutting of the movable knife 4 is connected.

Die einzelnen Teile sind gemäß F1g. 3 steuern^- Big wie folgt miteinander verbunden. Der Druckmittelraum? des Zylinders 6 steht über die Leitungen 18 19 mit einem Rückschlagventil 20 und einem einstellbaren überdruckventil 21 in Verbindung, von denen aus eine Leitung 22 zu einem hydraulischen Druckmittelbehälter 23 führt. Dieser ist über eine pneumatische Leitung 24, in der ein Ventil to vorgesehen ist, mit einer Leitung 26 zu einer Preßluftquel^le De^Vr^eKonfa^ekt 16«, der mit der Stellmutter 15 zusammenwirkt, ist mit dem Steuerventil 29 verbunden^ das in dner Verlängerung 31 zu der Kupplung ^ des Scherenschlittens mit dem beweglichen Messerführt. Mit dem beweglichen Ventil to steht sowohl der Längenanschlag 17 als auch der Scherenschlit.cn mit dem beweglichen Messer derart in Verbindung. S durch den Längenanschlag 17 der Druckmittelbehälter mit der Preßluftquelle Q verbunden und somit auch in dem Raum 7 ein Druck aufgebaut wird. während bei beginnender Scherenschl.ttenbewegung das Ventil 25 umeesteuert wird, wobei durch das Ventil 21 ein konstanter Druck im Raum 7 entsprechend der Einstellung dieses Ventils aufrechterhalten wird.The individual parts are according to F1g. Control 3 ^ - Big linked as follows. The pressure medium room? of the cylinder 6 is connected via the lines 18 19 to a check valve 20 and an adjustable pressure relief valve 21, from which a line 22 leads to a hydraulic pressure medium container 23. This is connected via a pneumatic line 24, in which a valve is to provided with a conduit 26 ^le to a Preßluftquel De ^V r ^e Konfa ^e kt 16 'which cooperates with the adjusting nut 15 is connected to the control valve 29 ^ which in The extension 31 leads to the coupling ^ of the scissors carriage with the movable knife. Both the length stop 17 and the Scherenschlit.cn with the movable knife are connected to the movable valve to in this way. S is connected to the compressed air source Q by the length stop 17 of the pressure medium container and thus a pressure is built up in the space 7 as well. while the valve 25 is reversed when the scissor shaft movement begins, the valve 21 maintaining a constant pressure in the space 7 in accordance with the setting of this valve.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

Claim:

Billet or section steel shears with a movable shear knife with respect to the Workpiece longitudinal axis opposite pressure medium-operated, from a piston-cylinder unit existing section holder whose return movement in its starting position when Cutting off the workpiece section is carried out by the movable scissor knife, thereby characterized in that the section holder (10) is located in its direction of movement Threaded rod (12) with a longitudinally adjustable and with a trigger contact (16, 29) for the movable scissors knife (4) cooperating threaded nut (15) carries and between the pressure medium source (O) for the section holder (10) and its cylinder (6) an adjustable Overpressure i, 21) and a check valve (20) are arranged.

2525th

The invention relates to billet or section steel shears with a movable shear knife with respect to the workpiece longitudinal axis opposite one another pressure medium actuated, consisting of a piston-cylinder unit, depreciation holder, its return movement to your starting position takes place when the workpiece section is cut off by the movable scissor knife.

A pair of scissors is known for cutting billets, profiled material to be cut and the like in particular (German Patent 564 727), in which to obtain a flat, to the longitudinal axis of the workpiece right-angled cutting surface, with any workpiece thickness of the section holder automatically sets in the support system for the end of the workpiece to be cut off and in in this position, it moves at the same speed as the movable knife. After the cut has been completed, the parts return to their original position in such a way that between the section holder and the movable knife a sufficient space remains to the to be able to push the next end of the workpiece to be cut between these parts. With such a The scissor carriage can move scissors in both a vertical and a horizontal plane will. The movement of the section holder is in the known embodiment by the movement of the scissor slide via an extensive linkage with coupling with a wedge. at the infeed movement of the section holder causes the wedge to slip into the slipping clutch adjusted a direction, while the return of the section holder in its starting position The wedge is withdrawn from its position and the clutch slips back into its starting position. This known device is expensive in that it has a long lever linkage and a slip clutch must be taken into account.

There is also a billet shears known (German Patent 955 471), in which the movable Scissors knife is arranged on a curved cutting lever swinging around a bolt, its drive takes place via a hold-up lever articulated with this cutting lever. Of the In this embodiment, the drive of the movable scissor knife is in contrast to the one above known embodiment caused by the driven hold-up lever, and it requires a precise adjustment of the kinematically linked levers to the respective thickness of the product.

The German Offenlegungsschrift 1 402 356 already describes a hydraulic billet or section steel shear with a fixed and a movable knife, with a hold-down device and with a counter or section holder known that while holding the workpiece section to be separated of the cut between the holder and the movable knife is used. A length stop takes care of the Compliance with the desired length of the workpiece section to be cut off. With this well-known Scissors bring the movable knife into its counter or section holder during the cut Starting position.

In the case of the above-described scissors according to German Offenlegungsschrift 1402 356, it can it is inevitable that short, severed workpiece sections stick to the counter or section holder. But it is even more important that the counter-holder pressure is always in relation to the shear pressure is constant, i.e. i.e., as the shear pressure increases, the backing or section holder pressure also increases. However, this corresponds to the counter or section holder pressure not the respective requirements, so z. B. when changing from thin to thick, from soft on hard and from short to long workpieces and vice versa.

Accordingly, the invention is based on the object of providing scissors of the type mentioned at the beginning to create a clean, burr-free and scuff-free cut despite different cutting conditions (thick and thin, long and short workpieces, hard and soft material).

To solve this problem, the invention provides a pair of scissors of the type described, in which the Section holder a threaded rod located in its direction of movement with a longitudinally adjustable one thereon and threaded nut cooperating with a release contact for the movable scissor knife carries and between the pressure medium source for the section holder and its cylinder adjustable pressure relief valve and a check valve are arranged.

The invention is based on the solution of the problem that to achieve a flawless cut of the cutting gap between the two knives of the axis angle, d. H. the location the workpiece axis to the knife plane, as well as the pressure of the section holder on the workpiece are taken into account. Due to the adjustability of the section holder with the help of the threaded rod and the adjustable threaded nut is given to the workpiece before and at the start of the cut very specific angular position to the knife plane in a corresponding to the cutting conditions Cutting gap, while through the valves when cutting one of the type and material of the workpiece appropriate section holder pressure is maintained.