EP2674231A1 - Device for bending metal pieces - Google Patents

Abstract

The device comprises a table (1) extending in a longitudinal direction for receiving and supporting a lower tool, two sub-tools (6,7) of the lower tool and a movable spacer (5). A distance between the two sub-tools is adjustably varied in a transverse direction of the table by the spacer. Each sub-tool comprises a support area with a support surface (7b), over which a vertical component of a bending force is introduced into the table. The spacer is arranged between the support surface and the table, and a portion of the vertical component of the bending force is introduced into the spacer.

Description

The invention relates to a device for bending metal parts according to the preamble of claim 1.

US 5,249,452 A describes a device for bending metal parts, in which two part tools with bending areas are adjustable at a distance from one another via a worm mechanism. The sub-tools are each supported directly on a table. To fix the positioning of the sub-tools, a distance between a fixed, lateral stop of the table and the part tools can be adjusted via a plurality of spacers stacked one above the other.

A disadvantage of the known solution is its complex structure and the complex handling.

It is therefore the object of the invention to provide a device for bending metal parts, which has a simple and versatile adjustability.

This object is achieved for an aforementioned device by the characterizing features of claim 1. Advantageous developments are set forth in the figures and in the dependent claims.

The arrangement of the spacer between the support surface and the table in conjunction with the at least partial introduction of the vertical component of the bending force in the spacer, a simple adjustment of a lateral position of at least one of the sub-tools can be realized. For example, this can be accomplished by changing the position of the at least one spacer without having to remove or add parts. This facilitates the adjustment work in general and especially in the case of large and heavy spacers and part tools.

Under a lower tool in the context of the invention is generally the lower part or the lower die of a bending device, in particular a bending bench to understand. As a rule, a corresponding upper tool is provided, which is moved to bend the workpiece against the die. Alternatively, it is also conceivable that the die is moved and the upper tool is fixed.

Generally, metal sheets are bent with a device according to the invention.

For the purposes of the present invention, the die or the lower tool consists of at least two partial tools, which are variably spaced in a generally horizontally oriented transverse direction of the table. This does not exclude in particular that the table can be fitted in an alternative assembly version with matrices without a variable distance, whereby the universal applicability is increased.

The spacer defined in the context of the invention, the lateral position of a sub-tool by a lateral force component of the bending process is at least partially introduced into the spacer.

A bending region of the sub-tools is at least a part of the tool surface to understand, which interacts directly with the metal part to be bent. Such bending areas regularly have a defined shape, z. B. a certain radius of curvature, and other properties such as a certain hardness. In principle, the part tool can be composed of several parts, wherein, for example, the bending area is provided as a fixed or replaceable component.

For the purposes of the invention, it is sufficient if one of at least two sub-tools has already been received on the table in the manner according to the invention. Generally preferred is the same shot but for both Sub-tools provided, wherein preferably the sub-tools and / or their recordings are formed symmetrically.

In a preferred embodiment of the invention, it is provided that a plurality of spacers is arranged between at least one of the sub-tools and the table, wherein a projecting guidance of the sub-tool engages in a provided between the spacers, changeable in the transverse direction of the table gap. In this way, by a simple displacement of one or more of the spacers in the transverse direction, a change in the position of the part tools can be achieved. Particularly preferably, none of the spacers must be removed or replaced. The displacement of the spacers can be done for example by simply lifting the part tools, whereby the spacers are released under the part tools. In one possible embodiment it can be provided that a projecting guide is provided on a separate component arranged between the spacers, wherein this guide engages in a corresponding recess, for example a groove, in the part tool. In such an embodiment, the separate component forms a guide for the part tool in the context of the invention. In the interest of a simple design and high position accuracy, however, it is preferred that the guide is formed as a solid unit with the support region of the sub-tool.

In a preferred development, a stack closed in the transverse direction of the table can be formed by the plurality of spacers and the guide of the part tool. This allows a particularly compact and secure recording of the sub-tools. In addition, an additional clamping in the transverse direction is made possible when needed in a simple manner. Under a closed stack according to the invention is a filling of a given in the transverse direction of the table distance by spacers and guides to a predetermined Understimulation to understand. The undersize is used for easy installation and / or clearance compensation. If required, it can be bridged by a clamp.

In a generally advantageous manner, the table comprises a support surface which is extended in the transverse direction and the longitudinal direction and which has two rigid edge-side boundaries in the vertical. Such a simple design of the table geometry allows a particularly universal use. Particularly preferably, the table has a medium, rigid bridge. In this way, for example, each of the sub-tools can be supported separately from the other in a closed stack of spacers. In particular, this can be done by means of a provided if necessary clamping member.

In a generally preferred detailed design, the table comprises a clamping device acting on the spacer and at least one of the sub-tools in the transverse direction of the table. As a result, a backlash-free and accurate positioning and mounting of the part tool is possible. By clamping, if necessary, a sufficient frictional retention of part tool and spacers in the longitudinal direction can be achieved. In a preferred detailed design, this may be a transversely acting, hydraulically driven clamping member, whereby high and well adjustable clamping forces can be achieved.

In a preferred embodiment of the invention, an adjustable lower tool with two unchangeable spaced bending areas can be used on the table. Preferably, but not necessarily, this may be a one-piece bending tool. Such invariable lower tools are regularly present in existing bending devices, so that the use of an inventive device can be made particularly universal and using existing tools.

It is particularly preferably provided that an adapter piece between the spacer and the adjustable lower tool is arranged. Preferably, but not necessary, the bending force of the lower tool is completely passed into the adapter piece. Such an adapter piece may, for example, keep the unconfigurable lower tool centered over a mid-perpendicular of the table. If the table has a central, rigid web, the adapter piece can be arranged above the web in order, for example, to allow any, in particular centric, arrangement of the adjustable lower tool.

In a generally advantageous embodiment of the invention, the two sub-tools can be positioned either asymmetrically or symmetrically with respect to a bisector of the table. In this case, an upper tool is preferably movable in each case along the mid-perpendicular. In addition to the usual symmetrical arrangement, a higher flexibility can be achieved by the asymmetrical arrangement depending on the bending task. For example, by asymmetrical arrangement with respect to the perpendicular bisector or a lateral position of the upper tool a particularly deep U-profile can be bent from a sheet without the legs of the profile collide with the upper tool.

To further improve the universal applicability, it is provided that at least one of the sub-tools has a second bending region, which is wider in relation to its bending region. In this case, the bending regions preferably have a different shape in order to fulfill different bending tasks with regard to the radius of curvature, plate thicknesses or the like. In particular, the various bending regions may be present on opposite sides of the part tool. As a result, the respectively desired bending region can be brought into use by simply turning the partial tool around a vertical axis or else about a longitudinal axis. When rotating the part tool about the vertical axis by 180 °, the same bearing surface and a possible guidance of the Sub-tool used identically. When rotating about the longitudinal axis, it is expedient to provide a plurality of corresponding bearing surfaces and guides on the partial tool.

In a further preferred embodiment of the invention, in each case a substantially flat portion is arranged on the partial tools, wherein by means of the bending areas and the flat portions a flattening or pressing of a metal part is made possible. This allows an even more flexible use of the inventively designed device.

In the interest of a simple and robust production, at least the support area of one of the sub-tools is formed in one piece in the longitudinal direction. Preferably, the entire part tool can be integrally formed in the longitudinal direction. The one-piece design in the longitudinal direction does not exclude that the part tool is constructed in a longitudinal direction to the longitudinal sectional plane of several elements. In particular, this can be a division into the support area and into the bending area. For example, the bending area may be made of a harder material and / or be replaceable.

The object of the invention is also achieved by the use of an inventive device for bending thick metal sheets, wherein a thickness of the metal sheet is in particular not less than 5 mm, preferably not less than 8 mm. The bending of such thick metal sheets requires particularly large bending tools, so that costs and effort compared to conventional devices for bending thick sheets is saved by the flexible inventive design. In a preferred detailed design, a bending force of an upper tool is at least about 1000 kN / m. The associated dimensioning of the spacers, which also support the bending force according to the invention in the vertical direction, can be optimally combined with an arrangement between the part tool and the table.

Further advantages, features and details of the invention will become apparent from the following description in which embodiments of the invention are described with reference to the drawings. The features mentioned in the claims and in the description may each be essential to the invention individually or in any desired combination.

The list of reference numerals is part of the disclosure. The figures are described coherently and comprehensively. Like reference numerals mean like components.

Fig. 1

eine erste Ausführungsform einer erfindungsgemässen Vorrichtung in einer Schnittansicht,

Fig. 2

die Ausführungsform aus Fig. 1 mit verändert positionierten Teilwerkzeugen,

Fig. 3

die Ausführungsform aus Fig. 1 mit asymmetrisch positionierten Teilwerkzeugen,

Fig. 4

einen Tisch der Vorrichtung aus Fig. 1 mit einem geöffneten Klemmglied,

Fig. 5

den Tisch aus Fig. 4 mit geschlossenem Klemmglied,

Fig. 6

eine Abwandlung der Vorrichtung aus Fig. 1 mit Teilwerkzeugen, die mehrere Biegebereiche aufweisen,

Fig. 7

die Vorrichtung aus Fig. 6 mit umgedrehten oder vertauschten Teilwerkzeugen,

Fig. 8

eine weitere Abwandlung der Vorrichtung aus Fig. 1 mit zu einem Flachdrücken geeigneten Teilwerkzeugen,

Fig. 9

eine Abwandlung der Vorrichtung aus Fig. 1, bei der ein herkömmliches Unterwerkzeug über einen Adapter verwendet wird.

It shows:

Fig. 1

A first embodiment of a device according to the invention in a sectional view,

Fig. 2

the embodiment of Fig. 1 with differently positioned part tools,

Fig. 3

the embodiment of Fig. 1 with asymmetrically positioned part tools,

Fig. 4

a table of the device Fig. 1 with an open clamping member,

Fig. 5

the table off Fig. 4 with closed clamping element,

Fig. 6

a modification of the device Fig. 1 with part tools that have several bending areas,

Fig. 7

the device off Fig. 6 with inverted or reversed part tools,

Fig. 8

a further modification of the device Fig. 1 with part dies suitable for flattening,

Fig. 9

a modification of the device Fig. 1 in which a conventional lower tool is used via an adapter.

In the Fig. 1 shown device according to the invention comprises a table 1, which is mounted stationary. The table 1 extends substantially prismatically in a longitudinal direction perpendicular to the plane of the drawing. A transverse direction of the table 1 extends horizontally in the plane of the drawing. A vertical direction perpendicular to the longitudinal direction and the transverse direction corresponds to the direction of gravity.

The table 1 is made in a known manner and generally in the manner of steel tool tables.

In an upper area, the table 1 has a support surface 2 which extends in the transverse direction and in the longitudinal direction. From the bearing surface 2 rise two rigid, edge-side boundaries 3 and a middle, rigid web 4. The central web 4 is arranged centrally about a perpendicular bisector M of the table 1. The boundaries 3 and the web 4 each have vertical side surfaces 3a, 3b, 4a. By the side surfaces 3a, 3b, 4a of the boundaries 3 and the web 4, the support surface 2 is divided into a left support region 2a and a right support region 2b.

In each of the bearing areas 2a, 2b, a plurality of spacers 5 are arranged. In the present case, the spacers 5 are formed as a prismatic body of rectangular cross-section which is integral in the longitudinal direction. Alternatively, in each case a plurality of sections may be arranged one behind the other in the longitudinal direction.

In the schematically illustrated embodiment, three spacers 5 are provided in each support area 2a, 2b, wherein the exact number is arbitrary depending on the requirements. The spacers 5 are each directly on the table 1. A summed width of the spacers 5 in the transverse direction of the table 1 is smaller than the width of the support region 2 a and 2 b between the stationary side surfaces 3 this difference remains a gap or a groove extending in the longitudinal direction, in each of which a guide 6a, 7a of a lower tool can engage.

The sub-tool comprises a first sub-tool 6 and a second sub-tool 7. The sub-tools 6, 7 are formed as prismatic longitudinal body, each having a support area with a support surface 6b, 7b and from the support surface 6b, 7b projecting guides 6a, 7a on a bottom , Each of the sub-tools 6, 7 has at least one bending region 6c, 7c which extends over the length of the sub-tool 6 or 7 and in the transverse direction over a defined part of an upper edge. The bending areas 6c, 7c have defined rounding and hardening in the present case. Such bending areas 6c, 7c are often also referred to as inlet radii.

Fig. 3 shows a representation in which also an upper tool 8 and a workpiece 9 are shown made of sheet metal, wherein the upper tool 8 with a bending area (upper tool radius) 8a and the sub-tools 6, 7 with the bending portions 6c, 7c on the workpiece 9 attack.

The protruding in the manner of a web guides 6a, 7a together with the spacers 5 each have a closed stack, each one of the support areas 2a, 2b fills.

By displacing one or more of the spacers 5 within the support area 2a, 2b in the transverse direction of the table 1, the remaining gap and thus the position of the part tool 6, 7 in the transverse direction can be changed. In this way, in particular a distance of the sub-tools 6, 7 can be changed from each other.

At least in some selectable positions of the spacers 5, at least part of the support surface 6b, 7b of at least one of the sub-tools 6, 7 rests on at least one of the spacers 5 such that a part of a bending force acting on the part tool 6, 7 passes over the spacer 5 in the table 1 is initiated. In particular, a vertical component is introduced into the spacer 5. A transverse component of the table 1 or horizontal component is also received by at least one of the spacers 5. In Fig. 1 These are each the two outer spacers 5, which are inserted between the guide 6a, 7a and the boundaries 3.

In the present, schematic representations, the guides 6a, 7a have the same cross-sectional shape and height as the spacers 5. In practice, the height can either be the same, so that the guides 6a, 7a contribute to the vertical support of the sub-tools 6, 7, or the guides 6a, 7a may have a smaller height, so that only the wings 6b, 7b extending beside the guides 6a, 7a introduce the vertical bending force into the spacers 5. In the present case, the web 4 and the boundaries 3 have the same height as the spacers 5, so that the wings 6 b, 7 b can overlap these flush. This easily allows an enlargement of the adjustment range in the transverse direction. But it can also be provided that the web 4 and / or the boundaries 3 have a greater or smaller height.

In Fig. 2 is a changed position of the spacers 5 and thus the sub-tools 6, 7, which corresponds to a maximum distance of the sub-tools 6, 7. The guides 6a, 7a are now directly on the side surfaces 3a, 3b of the boundaries 3 at. In Fig. 1 is a position with the present second smallest distance of the sub-tools 6, 7 shown. With the three spacers 5 shown a total of four different positions of the sub-tools 6, 7 can be realized without changing the spacers 5. Such, simple position change can z. B. by raising the sub-tools 6, 7 and a subsequent displacement of the spacers 5 in the transverse direction.

4 and FIG. 5 show the table 1 and the spacers 5 in the position Fig. 2 omitting the sub-tools 6, 7. A hydraulic clamping member 10 is present in each of the outer boundaries. 3 intended. Fig. 3 shows the clamping in the open state, so that the sub-tools 6, 7 can be freely inserted or removed. Fig. 4 shows the clamping member 10 in the closed or activated state, wherein a hydraulically acted bar in each case protrudes from the side surface 3a, 3b.

In the present, schematic example, the clamping is directed in each case against a transverse component of the bending force. This does not mean that this force component is supported by the clamp. Rather, the geometry of the sub-tools 6, 7 and their bearing surfaces is designed so that at least a majority of this force is intercepted by friction.

In another embodiment, not shown, but the clamping can also act in the same direction, such as the clamping member 10 is disposed on the central web 4.

In addition to a symmetrical arrangement of the sub-tools 6, 7 with respect to a perpendicular bisector M of the device, these can also be arranged asymmetrically, such as Fig. 3 shows. The upper tool 8 is moved unchanged in the mid-perpendicular M above the web 4. The workpiece 9 shown is a thick sheet of more than 8 mm wall thickness, which in the present case is bent into a U-profile. A leg 9a of the U-profile pointing towards the upper tool 8 can be made longer by the lateral or asymmetrical offset of the partial tools 6, 7.

At the in Fig. 6 and Fig. 7 shown modification of the inventive device, the sub-tools 6, 7 in addition to a first bending region 6c, 7c each have a further bending region 6d, 7d. The bending areas 6c, 7c and 6d, 7d are formed on opposite upper edges of the sub-tools 6, 7. By reversing the sub-tools 6, 7 by 180 ° about the vertical axis or by interchanging the sub-tools 6, 7 with unchanged orientation of the other bending region 6c, 7c and 6d, 7d are directed inward or toward the workpiece. The Bending areas 6c, 7c, 6d, 7d differ in the present case by different radii of curvature. In the arrangement according to Fig. 6 the first bending areas 6c, 7c are directed to the workpiece with a large radius of curvature. In the arrangement according to Fig. 7 In each case, the second bending regions 6d, 7d are directed with a smaller radius of curvature to the workpiece.

Fig. 8 shows the device after Fig. 1 , in turn, differently shaped part tools 6, 7 are used. In the present case, flat or straight, in the present case vertical sections 11 are provided beneath the bending regions 6c, 7c, by means of which a workpiece can be flattened or pressed in conjunction with a suitable upper tool. The flat portions 11 serve to guide the upper tool. The sub-tools 6, 7 are presently set at a minimum distance from each other.

Fig. 9 shows the device Fig. 1 , wherein the sub-tools 6, 7 are replaced by an adapter 12. The adapter 12 has an upper-side recess 12a into which a conventional lower tool 13 with a conventional guide 13a is inserted. The conventional lower tool 13 is presently designed as a one-piece lower tool with two invariably spaced bending regions 13b.

A support surface 12b of the adapter 12 in the present case has only one guide 12c, which is guided only in one of the receiving regions 2b between the spacers 5.

In the present case, the adapter piece 12 and the lower tool 13 are arranged symmetrically with respect to the mid-perpendicular M, wherein the adapter piece in particular engages over the middle web 4 and thus makes it possible to mount the conventional lower tool 13 in the central position. However, an asymmetric positioning is possible as needed.

It is understood that the specific features of the individual embodiments can be usefully combined depending on the requirements.

LIST OF REFERENCE NUMBERS

1

table

2

bearing surface

2a

first edition

2 B

second edition

3

limitations

3a, 3b

faces

4

central pier

4a

faces

5

spacer

6

first part tool

7

second part tool

6a, 7a

guides

6b, 7b

wings

6c, 7c

bending areas

6d, 7d

second bending areas

8th

upper tool

8a

Bending area v. 8th

9

workpiece

9a

Leg of the workpiece

10

clamping member

11

flat section

12

adapter piece

12a

admission

12b

Wing adapter piece

12c

Guide adapter piece

13

lower tool

13a

Guide lower tool

13b

bending areas

Claims (14)

Apparatus for bending metal parts, in particular metal sheets, comprising a longitudinally extending table (1) for receiving and supporting a lower tool (6, 7, 13), a first part tool (6) and at least a second part tool (7) of the lower tool and a movable spacer (5); wherein a distance of the two sub-tools (6, 7) in a transverse direction of the table (1) by means of the spacer (5) is adjustably changeable, wherein each of the sub-tools (6, 7) has a support portion (6a, 7a, 6b, 7b) a support surface (6b, 7b) via which a vertical component of a bending force is introduced into the table (1); and wherein each of the sub-tools (6, 7) comprises a bending area (6c, 7c) which cooperates with a metal part (9) to be bent, characterized in that the spacer (5) between the bearing surface (6b, 7b) and the table (1) is arranged and at least a part of the vertical component of the bending force is introduced into the spacer (5). Apparatus according to claim 1, characterized in that between at least one of the sub-tools (6, 7) and the table (1) a plurality of spacers (5) is arranged, wherein a projecting guide (6a, 7a) of the sub-tool (6, 7 ) in a between the spacers (5) provided in the transverse direction of the table (1) interchangeable gap engages. Apparatus according to claim 2, characterized in that in the transverse direction of the table (1) closed stack can be formed by the plurality of spacers (5) and the guide (6a, 7a) of the sub-tool (6, 7). Device according to one of the preceding claims, characterized in that the table (1) has a transverse direction and Has longitudinally extended support surface (2), which has in the vertical at least two rigid, edge-side boundaries (3) and in particular a middle, rigid web (4). Device according to one of the preceding claims, characterized in that the table (1) in the transverse direction on the spacer (5) and at least one of the sub-tools (6, 7) acting clamping device (10), in particular in the form of acting in the transverse direction , hydraulically driven clamping member (10). Device according to one of the preceding claims, characterized in that an immovable, in particular one-piece, lower tool (13) with two unchangeable spaced bending regions (13b) on the table (1) can be inserted. Apparatus according to claim 6, characterized in that an adapter piece (12) between the spacer (5) and the adjustable lower die (13) is arranged. Apparatus according to claim 7, characterized in that the bending force of the lower tool (13) is completely guided in the adapter piece (12). Device according to one of the preceding claims, characterized in that the two sub-tools (6, 7) are either asymmetrically or symmetrically with respect to a perpendicular bisector (M) of the table (1) can be positioned, in particular an upper tool (8) along the perpendicular bisector is movable. Device according to one of the preceding claims, characterized in that at least one of the sub-tools (6, 7) has a second bending region (6d, 7d) which is wider than its bending region (6c, 7c). wherein in particular the bending regions (6c, 7c and 6d, 7d) have a different shape. Device according to one of the preceding claims, characterized in that in each case a substantially flat portion (11) is arranged on the part tools (6, 7), wherein by means of the bending areas (6c, 7c) and the flat portions (11) a flat pressing or Pressing a metal part is possible. Device according to one of the preceding claims, characterized in that at least the support region (6a, 6b, 7a, 7b) of one of the sub-tools (6, 7), in particular the entire sub-tool (6, 7), is integrally formed in the longitudinal direction. Use of a device according to one of the preceding claims for bending thick metal sheets (9), wherein a thickness of the metal sheet (9) is in particular not less than 5 mm, in particular not less than 8 mm Use according to claim 13, characterized in that a bending force of an upper tool (8) is at least about 1000 kN / m.

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