CN103962433B - For the method for being molded sheet material and relevant segmenting device and mould - Google Patents

Abstract

The invention relates to a method for forming a sheet material ( 110 ) in a forming tool ( 200 ) associated with a press, such as in particular a deep-drawing tool, which can influence the material flow in a targeted and local manner during the forming process. It is provided that the forming process is detected and thus monitored by means of at least one sensor (400) installed in the forming tool (200), and sheet material (110) is introduced at least one defined position in the forming tool (200) when a critical state is detected Targeted parting lines (T) of the slits, so that a locally enhanced material flow can thus be achieved during the subsequent forming process. The invention also relates to a parting device for introducing a targeted parting line (T) of a sheet material (110) in a forming tool (200) during a forming process and in particular for implementing the method of the invention for making A press-related forming die (200) for forming sheet material (110) comprising at least one dividing device (300) according to the invention.

Description

Method for forming sheet material and related dividing device and forming tool

technical field

The invention relates to a method for forming a sheet metal material in a forming tool associated with a press, such as in particular a deep-drawing tool, whereby the material flow can be influenced locally in a targeted manner during the forming process.

The invention also relates to a dividing device for use in a forming tool associated with a press and to a forming tool associated with a press having at least one such dividing device.

Background technique

A forming tool associated with a press for forming sheet material has a plurality of relatively movable tool parts (for example a tool upper part and a tool lower part) configured with corresponding working surfaces. In order to obtain the desired material flow of the sheet metal material to be formed in the forming tool during forming, it usually requires complex processing.

Another possibility is to influence the forming tool from the outside during the forming process, for example with controlled drawbeads and/or by changing the pressing plate pressure, in particular along the flange section (tool flange) Material flow in , wherein solutions for adjusting the local platen pressure are also known (for example by means of a four-point drawing pad mechanism on the press side). In addition, there is the possibility that during the forming process, for example, so-called relief holes are provided in the sheet material, whereby the material flow in the forming tool is influenced from the inside. Such load relief holes are usually arranged in the region of subsequent cutouts (eg window cutouts, door cutouts, sliding roof cutouts, etc.).

During the ever-increasing complexity and changing production requirements of sheet metal profiled part geometries and new sheet materials, the measures known from the prior art are often no longer sufficient to influence the material in the forming tool during the forming process, i.e. during the shaping of the sheet material flow. This relates in particular to the production of profiled sheet-metal parts for motor vehicle bodies, which in some cases also have design parts that are difficult to form.

Contents of the invention

The object of the present invention is to propose a solution which avoids the disadvantages of the prior art or at least reduces them.

This object is achieved by a method according to the invention. The solution of said object also extends to the dividing device according to the invention. The solution of said object also extends to the forming tool according to the invention. All preferred refinements and designs of the inventive subject matter are derived analogously from the ensuing presentation. The method according to the invention for forming sheet material in a forming tool associated with a press enables a targeted local influence of the material flow during the forming process, characterized in that at least one sensor installed in the forming tool is used To detect and thus monitor the forming process and, when a critical state is detected, to introduce a targeted parting line of the sheet material at at least one defined position in the forming tool, so that a locally enhanced material flow can thus be achieved during the subsequent forming process . A parting device according to the invention for introducing a targeted parting line of a sheet material in a forming tool during a forming process comprises at least one grooving and/or cutting element and at least one counter grooving and/or cutting element Actuating drive mechanism, characterized in that the dividing device has at least one sensor installed in the forming tool, and the sensor detects and thus monitors the forming process, and when a critical state is detected, at least one sensor in the forming tool A defined point introduces a targeted parting line of the sheet material, so that a locally enhanced material flow can thus be achieved during the subsequent forming process. A forming tool according to the invention associated with a press for forming sheet material for carrying out the method according to the invention comprises at least one dividing device according to the invention.

The method according to the invention is used for forming sheet material in a forming tool associated with a press, such as in particular a deep-drawing tool, and makes it possible to influence the material flow in a targeted and local manner during the forming process, which is characterized in that with at least one installation Sensors in the forming tool detect and thus monitor the forming process, when a critical state is detected, a targeted parting line of the sheet material is introduced at at least one defined position in the forming tool, so that it can thus be achieved during the subsequent forming process Locally enhanced material flow.

Material flow (material flow) refers to the relative movement of the sheet material to be formed with respect to the working surface of the mold. A smaller flow of material is characterized by a small degree of relative movement and/or a small velocity of relative movement, while a stronger flow of material is characterized by a greater degree of relative movement and/or a greater velocity of relative movement . Depending on the mode of observation, local material flow refers to the material flow in a certain area of the forming tool or in a certain section of the sheet metal material (eg sheet metal profile).

The invention makes it possible to locally intensify the material flow inside the forming tool during the forming process as required. This makes it possible to influence the material flow in the forming tool during the forming process not from the outside but from the inside (to a certain extent in the inner region of the sheet metal blank used). Various objectives can be achieved with the invention, such as avoiding cracks and wrinkles in the sheet material, preventing impermissible sheet thinning of the sheet material, avoiding receding edges in the sheet material or forming design edges without reclining edges wait. The invention is particularly suitable for the production of sheet metal parts of complex shape, preferably with design parts which are difficult to form. The panel part is, for example, a body panel component which, for example, has at least one profiled reinforcing edge and/or design edge. The invention can also contribute to the reduction of the processing steps (drawing steps) necessary for the production of sheet metal shaped parts.

According to the invention, the forming process is monitored with at least one sensor installed in or on the forming tool, wherein such a sensor can also be arranged on the press side, for example. A sensor is, in particular, a contact or non-contact sensor or measuring variable receiver installed at a suitable location. It is preferably provided that the sensor is directed towards the sheet metal material to be formed, so that it detects the forming process of the sheet metal material. This means that the forming process is monitored by means of sensors by direct "observation" of the sheet material.

The sensor is, for example, a sensor for detecting the thickness of the sheet (of the sheet material) or a sheet movement (in the forming tool) such as in particular a sheet edge forward (e.g. at the cut edge of the relief hole) sensor. The sensor can also be a camera. The forming process can be monitored by means of the values detected by the sensors (measured values). For this purpose, in particular a computer-based control unit with suitable software is provided, by means of which, when a critical state is detected, the segmentation process can also be initiated automatically.

It is preferably provided that the parting line of the sheet metal is produced in the region of the subsequent blanking parts (eg window blanking parts, door blanking parts, sliding roof blanking parts) or in the area of the abutment structure (joint structure especially sheet metal Formed parts in sections that belong neither to sheet metal components nor to flanges). It is particularly preferably provided that the parting of the sheet material takes place between two relief holes in the punched part or butt joint.

The sheet material can be divided at prescribed positions in the forming die by means of a dividing device installed in the forming die. It is preferably provided that the sheet metal material is notched (or a groove is made in the sheet metal material) and subsequently a crack is generated and propagated, whereby a parting line of the sheet metal material is produced. The slots created by means of the dividing device thus serve to induce cracks according to known laws. The course of the crack can be predetermined by means of the slot design and the course of the slot. It can also be provided that the sheet metal material is cut (or incisions are made in the sheet metal material), whereby parting lines of the sheet metal material are produced. A defined crack propagation occurs at the end of a notch made in a sheet material. It is also possible to combine the two procedures described (grooving and notching) with one another. Natural splitting (or cracking) of the sheet material may also occur during manipulation of the dividing device due to the stresses present on the sheet material.

The dividing device according to the invention is used to introduce targeted dividing lines of sheet material in a forming tool during the forming process, the dividing device comprises at least one grooving and/or cutting element and at least one for counter-grooving and/or The cutting part is manipulated especially by the drive mechanism that applies the force. When a critical state is detected, the drive mechanism can be activated for a targeted parting of the sheet metal by means of the grooving and/or cutting elements. Activation of the drive mechanism can be brought about by the control mechanism. The drive mechanism can be, for example, a spring mechanism (of the mechanical, hydraulic or pneumatic type) which is prestressed at the moment of actuation, or a hydraulic, pneumatic, electromagnetic or piezoelectric drive mechanism.

The forming tool of the invention in relation to a press comprises at least one dividing device according to the invention. The forming tool according to the invention can have a plurality of identical or differently designed dividing devices which can be manipulated independently as required. Furthermore, it is preferably provided that the forming tool according to the invention has at least one sensor for detecting a movement of the sheet metal, such as a forward tilt of the edge of the sheet metal. For this purpose, the sensor can observe the sheet material, in particular the edge (eg the inner cut edge at the relief hole), eg from a vertical direction (perpendicular to the sheet plane). In particular, it is provided that the sensor or the panel edge forward sensor is based on laser beam scanning.

Description of drawings

The invention is explained in detail below by way of example and without limitation with reference to schematic diagrams. However, the features shown in the figures and/or described below may be common features of the present invention independent of specific feature combinations.

Figure 1 shows a plan view of a sheet metal profile manufactured according to the invention;

FIG. 2 shows a partial sectional view of a forming tool according to the invention for producing the sheet-metal profile of FIG. 1 .

detailed description

FIG. 1 shows a sheet metal profile 100 consisting of profiled sheet metal material 110 . The profiled sheet-metal part 100 comprises a sheet-metal component 120 , wherein the sheet-metal component is, for example, a skin part (door outer panel) for a motor vehicle body. The sheet metal component 120 is surrounded by a flange 130 which is cut away in a subsequent cutting process. The sheet-metal component 120 has a window blanking 140 which is also cut out in a subsequent cutting process. 161 and 162 denote two load-relief openings provided in the interior of the window blanking 140 . A reinforced edge and/or a design edge in the sheet member 120 disposed below the lower edge of the window is indicated at 150 .

The formed sheet metal part 100 is produced by forming the sheet metal raw material provided as a sheet metal blank in a forming tool or sometimes also in a plurality of interconnected tools (deep-drawing process), wherein the forming tool is in particular a deep-drawing process mold. For example, the shaping of design edge 150 is critical here, since cracks, wrinkles, sheet metal thinning and/or edge receding can occur on sheet material 110 in the region of design edge 150 during the forming process.

The invention therefore provides that, in the region of the design edge 150 , the forming process taking place in the forming tool is monitored in real time with at least one sensor installed in the forming tool, and when a critical state is detected, the forming process takes place in a defined position in the forming tool. The sheet metal material 110 is divided in a targeted manner in order thereby to locally achieve an enhanced material flow during the further forming process.

The sensor can be, for example, a sensor (see reference numeral 400 ) at the relief holes 161 and/or 162 for detecting the forward lean of the sheet edge towards the design edge 150 . If the sheet edge rake is at a critical value, a time-accurate targeted (i.e. intentionally implemented) division of the sheet material 110 between the relief holes 161 and 162 can be performed during the subsequent forming process, thereby achieving an orientation toward The edge 150 is designed for stronger material flow. In FIG. 1 , T indicates a targeted parting line of the sheet material 110 , wherein the parting line can be a cut and/or a crack.

Targeted division of the sheet material 110 is carried out at prescribed positions (wherein, the positions shown in FIG. 1 are only exemplary) by means of the dividing device arranged in the forming mold. FIG. 2 shows a forming tool 200 with an upper tool part 210 , a lower tool part 220 and a dividing device 300 arranged in the lower tool part 220 . The cutting device 300 comprises a slitting and/or cutting element 310 , for example made of ceramic or hard metal, and a drive mechanism 320 for actuating the slitting and/or cutting element 310 . Denoted at 330 are shock absorbing and resilient components for dampening impacts and resetting the grooving and/or cutting components 310 .

If a critical state is recognized by a not shown control device by means of the value detected by the sensor 400, the drive mechanism 320 of the cutting device 300 is activated, and the wedge-shaped and then sharp-edged structure is then placed at a predetermined position with a predetermined force. The grooving and/or cutting member 310 is pressed against the sheet material 110 . Depending on the desired configuration, slots or cutouts can be made in the sheet material 110 here. The opening of the slots in the sheet material 110 leads to cracks and crack propagation due to the resulting stress state, which ends when the crack T reaches the load relief holes 161 and 162 . This can also be realized with minor modifications without the relief holes 161 and 162 , so that the invention can sometimes be realized without the relief holes.

For the grooving and/or cutting member 310 , especially when it is a grooving member, no corresponding mating grooving member or mating cutting member is provided. This distinguishes the dividing device 300 from known cutting devices, which generally comprise a knife and a cutting counter corresponding to the knife.

A preferred variant provides that the sheet metal material 110 is subjected to a predetermined sheet metal thinning in the section of a predetermined parting line T, optionally followed by cold hardening (Kaltverfestigung), and then by means of blunt cuts and/or The cutting element 310 applies a force F in a targeted manner, so that the sheet metal 110 breaks or splits in this area.

The figures are merely exemplary, showing a possible example of application of the invention. The invention, which is advantageous in many respects, proposes a new concept for actively influencing the material flow locally during forming or during molding inside the sheet-metal profiled part to be produced, which enables, for example, especially in the design of components Accurately form a given geometric shape, avoid edge receding, avoid indeterminate cracks and/or wrinkles, avoid narrowing parts, allow uniform thinning of the sheet, improve surface quality of components, prevent edge wandering in forming molds (and associated edge recoil) etc.

list of reference signs

100 Sheet Formed Parts

110 sheet material

120 plate member

130 Flange

140 punched parts

150 design edges

161 Load relief hole

162 Load relief hole

200 forming mold

210 mold upper part

220 Lower part of mold

300 split device

310 Grooving and/or cutting parts

320 drive mechanism

330 Vibration-damping and/or elastic components

400 sensors

F force

T Parting line (crack and/or cut).

Claims (11)

1. a kind of in the mould relevant with forcing press（200）In cause sheet material（110）The method of shaping, the party Method targetedly can partly influence material stream during forming process, it is characterised in that be arranged on using at least one Mould（200）In sensor（400）To detect and then monitor forming process, and when key state is recognized into Pattern has（200）At least one of regulation position introduce sheet material（110）Targetedly cut-off rule（T）, so as to Thus the material stream of local enhancement can be realized during subsequent forming process.

2. the method for claim 1, it is characterised in that sensor（400）It is the sensor for detecting sheet metal thickness, Or for detecting the sensor of sheet material movement.

3. method as claimed in claim 1 or 2, it is characterised in that sheet material（110）Cut-off rule（T）Rushing afterwards Cut out part（140）Region in produce, or in the region of docking structure produce.

4. the method as described in preceding claims 1, it is characterised in that by sheet material（110）Grooving, then crack and Crack Extension, thus produces sheet material（110）Cut-off rule（T）.

5. the method as described in preceding claims 1, it is characterised in that cutting sheet material（110）, thus produce sheet material （110）Cut-off rule（T）.

6. the method for claim 1, it is characterised in that sheet material（110）Cut-off rule（T）For avoiding sheet material material Material（110）Split, avoid in sheet material（110）It is middle to form wrinkle, avoid sheet material（110）The sheet material not allowed it is thinning And/or avoid in sheet material（110）Middle generation hypsokinesis edge.

7. the method for claim 1, it is characterised in that the mould（200）It is deep-draw mould.

8. it is a kind of to be used for during forming process in mould（200）Middle introducing sheet material（110）Targetedly divide Secant（T）Segmenting device（300）, the segmenting device include at least one grooving and/or cutting part（310）With at least one For to grooving and/or cutting part（310）The drive mechanism for being manipulated（320）, it is characterised in that the segmenting device （300）The mould is arranged on at least one（200）In sensor（400）, and the sensor（400）Inspection Survey and then monitor forming process, and when key state is recognized in mould（200）At least one of regulation position Put introducing sheet material（110）Targetedly cut-off rule（T）, it is local thus to be realized during subsequent forming process Enhanced material stream.

9. segmenting device as claimed in claim 8, it is characterised in that drive mechanism（320）It is elastic mechanism, or hydraulic pressure , pneumatic, electromagnetism or piezoelectricity drive mechanism.

10. it is a kind of be used for implementing the method according to any one of preceding claims 1 ~ 7 for causing sheet material（110）Into The mould relevant with forcing press of type（200）, the mould includes at least one according to claim 8 or claim 9 Segmenting device（300）.

11. moulds relevant with forcing press as claimed in claim 10, it is characterised in that the sensor（400）With In the sheet material that detection is to be formed（110）Sheet material movement.