WO2018002060A1

WO2018002060A1 - Perforating press

Info

Publication number: WO2018002060A1
Application number: PCT/EP2017/065870
Authority: WO
Inventors: David Hüsgen
Original assignee: Sms Group Gmbh
Priority date: 2016-06-28
Filing date: 2017-06-27
Publication date: 2018-01-04
Also published as: EP3475010B1; EP3475010A1; CN109414752A; DE102016211597A1; CN109414752B

Abstract

The invention relates to a perforating press, comprising an in particular hollow-cylindrically shaped receiver (1) for receiving a workpiece (2), an upset-cap (8), wherein the upset-cap (8) can be pressed against the workpiece (2) by means of an upset-force for a first deformation of the workpiece (2), and a perforation cap (7) arranged on a piercer (4), wherein the perforation cap (7) is pressed into the workpiece (2) by means of a perforation force for a second deformation of the workpiece (2). Both the upset-force of the upset-cap (8) and the perforation force of the perforation cap (7) are applied by means of a common drive member (5, 6).

Description

punch press

The invention relates to a punch press according to the preamble of claim 1.

From the production of seamless pipes are known punches, by means of which steel billets for further processing, e.g. be provided with a hole on a bumper. It is known to first perform a pre-compression of the billet by means of a compression cap to fit the billet in a recording. Subsequently, a punching of the billet is then made by means of a hole cap. The compression cap and the hole cap are each added to separate trusses, which are each advanced by separate drives. It is the object of the invention to provide a punch press, which allows a simple structural realization.

This object is achieved according to the invention for a punch press mentioned above with the characterizing features of claim 1. By exerting the compression force and the hole force by a common drive member costs and production costs of the punch press can be reduced. In addition, a reduction in size, in particular a height can be achieved.

In a preferred detail design, the height can be achieved by about 25% compared to conventional perforated presses with separate drive members for compression force and hole force. In this way, a frame of the punch press can be made stiffer and the dimensional accuracy of the formed workpiece can be increased. A moving mass of the punch press can also be significantly reduced. A punch press according to the invention can generally be used for hot or cold forming of workpieces of any material. It is preferably a punch press for hot forming a workpiece made of steel. In particular, the punch press is part of a production plant for producing seamless pipes, in particular of steel. In this case, the workpiece punched in the punch press is preferably transferred in the same heat to a subsequent processing, for example a push bench, rolling mill or the like. The workpiece may initially have any shape, for example as a solid cylinder or as a square billet.

A drive member in the sense of the invention is any actuator for exercising a force sufficient for forming the workpiece in the linear direction. Preferably, the drive member comprises a hydraulic cylinder. An upsetting cap and a perforated cap are preferably components which come into direct contact with the workpiece for forming and thereby experience corresponding mechanical loads and wear.

A transducer is within the meaning of the invention, a hollow mold, in which the workpiece is introduced, wherein it is supported in the course of the forming of the hollow mold. Due to the concomitant wear of the pick-up may preferably have a removable inner wall, for example in the manner of a removable sleeve. The second deformation or perforation of the workpiece can take place depending on the requirements as rising or filling deformation in the transducer. Preferably, an increasing transformation is provided.

In a preferred embodiment of the invention, it is provided that a frictional connection between the compression cap and the drive member via a detachable coupling member can be produced. This allows a simple and effective use the same Anthebsgliedes for the two Umformsch rites. The coupling member may be formed in various ways mechanical component to allow a releasable coupling, for example as a rod, toggle, link, cam or the like. Generally preferred, the coupling and decoupling of the coupling member is actuated automatically.

In a preferred detailed design, the coupling member comprises at least one coupling rod which can be attached between a traverse and the compression cap. The attached coupling rod forms a simple and highly stable power transmission means of the traverse on the compression cap. When the coupling rod is removed, the traverse only acts on the hole cap over the piercer and no longer on the compression cap. Preferably, the attachment and removal of the coupling rod can be automated, for example via a manipulator. The coupling rod may have the shape of a partial sleeve to improve the force distribution to at least partially surround the piercer. There may be provided several coupling rods to improve the power distribution.

Generally, it is provided that the punch press has only one traverse. As a result, the design of the punch press is much easier and cheaper. Under a cross member is understood in the context of the invention, a component that is movably guided relative to a frame of the press and transmits at least a major part of a forming force. In a particularly preferred embodiment, the compression cap is guided displaceably on the piercer. This allows not only a simple mechanical realization of the invention but also the use of the compression cap for guiding the piercer. In a generally advantageous manner, the compression cap has an upsetting surface which is aligned with the perforated cap, wherein the first deformation is achieved by a common pressing of the Upset surface and the hole cap against the workpiece. Thus it can be continued after the first forming without a new attachment of the hole cap of the second forming. Furthermore, it is preferably provided that the compression cap is guided displaceably in the transducer. This allows precise alignment of both the stuffer box and the piercer and the associated hole cap. In particular, it can be provided that a transverse guide of the piercing pin and thus the hole cap during the piercing operation via the wall of the transducer, wherein the compression cap acts as an outer and inner leading intermediate member between the piercer and the wall of the transducer.

In an advantageous detailed design, the compression cap bears against the workpiece during the second deformation and is moved with the deformation of the workpiece in the receiver. As a result, a respectively optimal position of the compression cap with respect to a guide of the piercing pin is ensured in particular with increasing deformation.

In a generally preferred embodiment, a guide of the punching mandrel relative to the pickup takes place by the upset cap during the second forming. An emigration of the hole cap is hereby avoided and dimensional accuracy of the punched workpiece is significantly improved.

Generally, it is provided that a shear ring is arranged on the receiver, a bottom of the perforated workpiece being separated by means of the shear ring. This allows the production of a dimensionally accurate hollow cylinder by means of the punch press.

Further advantages and features will become apparent from the embodiment described below and from the dependent claims. Hereinafter, a preferred embodiment of the invention will be described and explained in more detail with reference to the accompanying drawings.

Fig. 1 shows a punch press according to the invention in a state before a first forming operation and decoupled from a drive member

Upset cap.

Fig. 2 shows the punch press of FIG. 1 after a coupling of the

Stuffer cap with the drive member.

Fig. 3 shows the punch press of Fig. 2 after a preparation of the compression cap on a workpiece.

Fig. 4 shows the punch press of Fig. 3 after a first forming operation. Fig. 5 shows the punch press of FIG. 4 after decoupling the

Stuffer cap after the first forming process.

Fig. 6 shows the punch press of Fig. 5 after a second forming process, wherein a hole cap has pierced the workpiece.

FIGS. 1 to 6 show a punch press according to the invention in various, chronologically successive operating states. The punch press comprises a pickup 1, in which a workpiece 2 can be used. The transducer 1 is hollow cylindrical in shape, oriented perpendicular to an axis of the hollow cylinder and has an exchangeable for maintenance inner wall in the form of a sleeve 1 a. The workpiece is inserted by a manipulator, not shown, in the transducer. In the present example, the workpiece is made of a steel and is at a temperature for hot working.

At the bottom of the pickup 1 is a counter-holder 3, which supports the workpiece 2 from below. The counter-holder 3 can be removed at the end of a forming process or for maintenance purposes. In the attached state has the Counterholder the function of a rigid and immovable bottom of the picker 1.

A perforated mandrel 4 is accommodated on a driveable movable cross member 5. The cross member 5 is slidably mounted on guides, not shown, of a frame. A drive member 6 of the punch press is presently formed by the traverse and a force acting on the traverse hydraulic cylinder 6. The traverse 5 is moved by the hydraulic cylinder in the extension direction of the piercer. In the case of the traverse 5, this is the only traverse of the punch press.

The perforated mandrel 4 carries at its end facing the workpiece 2 an exchangeable hole cap 7. A compression cap 8 surrounds the piercer 4 in the manner of a ring and is displaceably guided on the piercer 4. In a lower position of the compression cap 8 this is held by the hole cap 7 as a stop. In this position (see, for example, FIG. 1), an upsetting surface 8a of the compression cap 8 facing the workpiece and an active surface 7a of the perforated cap 7 facing the workpiece are aligned.

An outer circumference of the compression cap 8 is also dimensioned so that the compression cap 8 is guided displaceably in the transducer 1. A game between the transducer wall and the compression cap 8 is chosen so that even with the temperatures occurring mobility is ensured with the most accurate guidance possible.

The compression cap 8 which can be moved on the perforated mandrel 4 can be detachably fixed in the lower position by means of a coupling element in the form of a coupling rod 9 (see FIG. 2). In this case, the coupling rod 9 between an upper side of the upset cap 8 and the traverse 5 and the drive member of the punch press used. The coupling rod 9 is shaped in the manner of a sleeve open on one side and surrounds the piercer partially for the purpose of a better power distribution.

The coupling rod in the present case has a substantially part-circular cross-section. In other embodiments, elliptical, polygonal or other cross-sectional shapes may also be present. The coupling rod may also consist of several sub-rods, which are recognized at different positions of the circumference of the piercing pin. In the attached state, the coupling rod, the piercer and the compression cap are each coaxial.

The insertion and removal of the coupling rod 9 by means of an automated manipulator, which is not shown here.

Furthermore, a shear ring 10 is disposed in the lower end of the pickup 1 on the anvil 3. By means of the shear ring 10, a bottom of the then perforated workpiece can be pierced at the end of the forming process. The invention now works as follows:

First, a heated to forming temperature workpiece, for example in the form of a steel billet, inserted into the transducer 1. In the illustration of Fig. 1, the compression cap 8 is first decoupled from the drive member 5, 6 and the coupling rod 9 does not engage.

Subsequently, the coupling rod 9 is attached to the piercer 4, so that a non-positive support between the traverse 5 and the compression stop located at the bottom stop 8 is made (see Fig. 2). Then, the piercing mandrel 4 is retracted with the hole cap 7 and the compression cap 8 in the pickup 1 until the crush surface 8a and the active surface 7a abut the workpiece 2 (see Fig. 3). Now, an upsetting force is exerted by means of the hydraulic cylinder 6, so that the workpiece 2 is pre-compressed in the course of a first transformation (see FIG. 4). After the pre-compression or first deformation, the workpiece 2 fills the transducer in the transverse direction at least so far that there is no longer any free movement play in the transverse direction.

Subsequently, the coupling rod 9 is removed and the compression cap 8 thus decoupled from the drive member 5, 6 to allow a second deformation or the actual perforation of the workpiece 2 (see Fig. 5). According to FIG. 6, the perforated mandrel 4 with the perforated cap 7 is now driven further, so that the perforated cap 7 perforates the workpiece 2 in the course of extrusion molding. In this case, an upper edge of the workpiece rises in accordance with the displaced material in the transducer 1 (increasing perforation). The case freely displaceable on the piercer pin 4 compression cap 8 is pressed with the edge of the workpiece upwards. The compression cup continuously exerts a leading function for the piercer 4, so that lateral migration of the perforated cap 7 is optimally avoided. In particular, there is a transverse guide of the piercing pin and thus the hole cap during the over the wall of the pickup 1, wherein the compression cap 8 acts as an outer and inner leading intermediate member between the piercer 4 and the wall of the pickup 1.

Finally, the hole cap is pushed through the shear ring 10, the retainer being retracted if necessary. This allows the removal of a remaining bottom of the workpiece 2, so that a complete perforation is achieved.

 LIST OF REFERENCE NUMBERS

1 recording

1 a exchangeable inner sleeve

2 workpiece

3 counterholds

4 piercer

5 traverse

6 hydraulic cylinders

7 hole cap

7a effective area of the hole cap

8 compression cap

8a compression surface of the compression cap

9 coupling link, coupling rod

10 shear ring

Claims

claims

1 . Punch press, comprising

an in particular hollow cylindrical shaped receptacle (1) for receiving a workpiece (2),

a compression cap (8),

wherein the compression cap (8) for a first deformation of the workpiece (2) with an upsetting force against the workpiece (2) is pressed, and

a perforated cap (7) arranged on a perforated mandrel (4),

wherein the perforated cap (7) can be pressed into the workpiece (2) with a perforating force for a second deformation of the workpiece (2),

characterized,

in that both the compression force of the compression cap (8) and the perforation force of the perforated cap (7) are exerted by means of a common drive member (5, 6).

2. Punch press according to claim 1, characterized in that a frictional connection between the compression cap (8) and the drive member (5, 6) via a releasable coupling member (9) can be produced.

3. Punch press according to claim 2, characterized in that the coupling member comprises at least one coupling rod (9) which is attachable between a traverse (5) and the compression cap (8).

4. Punch press according to one of the preceding claims, characterized in that the punch press has a total of only one traverse. Punch press according to one of the preceding claims, characterized in that the compression cap (8) on the piercer (4) is displaceably guided.

Punch press according to claim 5, characterized in that the compression cap (8) with the hole cap (7) aligned compression surface (8a), wherein the first deformation by a common pressing of the compression surface (8a) and the hole cap (7) against the workpiece (2) takes place.

Punch press according to claim 5 or 6, characterized in that the compression cap (8) in the receptacle (1) is displaceably guided.

Punch press according to one of claims 5 to 7, characterized in that the compression cap (8) during the second deformation without force on the workpiece (2) is applied and with the deformation of the workpiece (2) in the transducer (1) is moved.

Punch press according to one of claims 5 to 8, characterized in that by the upset cap (8) during the second forming a guide of the piercing mandrel (4) relative to the transducer (1).

0 punch press according to one of the preceding claims, characterized in that on the pickup (1) a shear ring (10) is arranged, wherein a bottom of the perforated workpiece (2) by means of the shear ring (10) is separated.