EP2802425A1

EP2802425A1 - Device and method for the deep drawing of shell parts with integrated head and frame trimming

Info

Publication number: EP2802425A1
Application number: EP13700092.3A
Authority: EP
Inventors: Thomas Flehmig
Original assignee: ThyssenKrupp Steel Europe AG
Current assignee: ThyssenKrupp Steel Europe AG
Priority date: 2012-01-12
Filing date: 2013-01-09
Publication date: 2014-11-19
Anticipated expiration: 2033-01-09
Also published as: US20140331731A1; KR101520442B1; WO2013104650A1; JP2015505276A; CN104080555A; CN104080555B; EP2802425B1; DE102012100230B4; US9289813B2; DE102012100230A1; KR20140109941A; JP6050382B2

Abstract

The invention relates to a device for producing shell parts having at least one base region (2), a frame region (3) and optionally a flange region (4) made from a flat or preformed blank (5), said device having a drawing die (6) as well as a drawing punch (7), wherein the drawing die has a moulding region (9') and at least one trimming region (8'), wherein the moulding region on the drawing die has the outer mould (11) for the shell part to be drawn and cut in the base region, frame region and optionally in the flange region on completion of the drawing process, wherein the drawing punch has a moulding region and at least one trimming region, wherein the moulding region on the drawing punch has the inner mould (10) for the shell part to be drawn and cut with base region, frame region and optionally a flange region on completion of the drawing process. The trimming region on the drawing punch forms a cutting contour with the moulding region on the drawing die, wherein the trimming and moulding regions (5a, 5b) of the plate can be separated at least in the frame and base regions of the finished, moulded shell part during and on completion of the drawing process, preferably in the final drawing process.

Description

Apparatus and method for deep drawing of shell parts with integrated head and Zanzgenbeschnitt

The invention relates to a device for the production of shell parts with at least one bottom, a frame and optionally a flange portion of a plane or

preformed board with a drawing die and a

Drawing die, wherein the drawing die has a molding area and at least one trimming area, wherein the

Forming area of the drawing die at the completion of the drawing operation, the outer shape of the to be drawn and cut

Shell part in the bottom, side and optionally in the

Flange region, the draw punch has a molding area and at least one trim area, wherein the molding area of the drawing die at the completion of the drawing process, the inner shape of the drawn and to be cut

Shell part with bottom, Zargen- and optionally flange has. In addition, the invention relates to a method for the production of shell parts. Shell parts having a bottom portion, a frame portion and optionally a flange portion are often made by drawing a flat or preformed metal sheet, preferably steel. From the prior art methods and apparatus for the production of in particular f ia affixed drawing parts are known with which from a flat board drawn parts by deep drawing and trimming can be made in a working stroke. So is from the textbook "cutting, punching and Ziehwerkzeuge ", Ohler and Kaiser, 8th edition (2001) known to execute the drawing die, which includes the bottom portion, frame portion and flange portion of the drawn part to be vertically displaceable, after the drawing operation, the finished drawn part on the flange outside of the driven together tool parts (Gesenk and stamp), so that as a result the desired

flanged drawing part in a working stroke of

Drawing stamp can be made. A corresponding

Drawing die is shown in the cited book on page 429. Due to the height-adjustable drawing die, the construction of the known from the prior art cutting-pull tool j edoch but relatively complex.

Furthermore, there are already in the prior art methods and corresponding devices for the production of drawn parts with integrated trim, which in order to avoid scraping of the flange on the cutting edge of the

Pulling the cutting process in a stretch-drawing ti the board perform so that during the cutting process, the material is under heavy tensile load and the

Flange area runs after the cut.

Due to the relatively uncontrolled wake of the

Flange area, drawn parts thus produced can not be manufactured accurately with high process reliability.

Finally, another problem is that the

Flange area must also extend obliquely to the frame area to a scraping at the sharp cutting edge

avoid. An often desired right-angled course of the flange area to the frame area is not in one

Process step to produce. Deep-drawing presses do not have a high-precision tool guide, so that trimming operations, in particular in the area of the base and frame area in Such presses are not possible or can only be carried out very difficult and expensive.

With the not yet published German patent application DE 10 2011 050 002.2, the Applicant has indeed achieved a solution for the trimming of the flange in one step during the drawing. However, there is a similar problem for the Kopfbeschnitt a drawn board. So far, at least two process steps are used, namely pulling the board and performing the cut. In addition, a so-called head eschnitt in the bottom and Zargenbereich and possibly. in the flange area of a shell part, additional cutting steps are usually required.

On this basis, the present invention is the

Task to provide an apparatus and a method for the production of shell parts by deep drawing available, with which or with which with as few steps, the production of the shell part and

at the same time a dimensionally accurate trimming can be achieved at least in the frame and bottom region of the shell part.

The above object is according to the teachings of the present invention with a device having the features of

The preamble of claim 1 is achieved in that the trimming area of the drawing punch forms a cutting contour with the forming area of the drawing die, with which a separation of the web is achieved during and at the conclusion of the drawing process

Trim and shape of the board at least in Zargen- and bottom portion of the finished molded shell part

preferably in the last drawing operation is feasible. By providing the cutting contour between the

The trimming area of the drawing punch and the forming area of the drawing die are reached when retracting the

Drawing punch in the drawing die the inserted in the drawing die board first in the frame area in engagement with the

Cutting contour device and the finished shell part can be separated by completing the drawing process in the bottom area. I the preferably last drawing process can therefore a finished, drawn shell part with ground and

Frame trim can be generated. The shape of the

Drawing punch or the drawing die forms the area which leads to the transformation of the substantially flat board or preformed board to the finished shell part. The trimming area serves to provide material for a defect-free drawing operation, so that an e.g. wrinkle-free pulling the molding area of the board is guaranteed. By separating the frame and bottom area of the finished

Shell part of the cutting area of the board, a finished shaped and trimmed shell part can be prepared in a preferably last drawing operation.

According to a first embodiment of the invention

Device is deepened the forming area of the drawing die compared to the trimming area of the drawing die and the

Forming region of the drawing die compared formed to the trimming area of the drawing die. Preferably, the height difference between the trimming and shaping area corresponds at least to the wall thickness of the board to be reshaped. Due to the fact that the forming area of the drawing punch compared to

Trimming area of the drawing punch is formed deepened, a normal drawing operation is achieved, since this no additional material in the bottom area of the board is required due to the greater draw depth of the trim area of the drawing punch. In addition, the height difference between the form and Beschnittbereicherl allows a dimensionally stable and

completely separating the finished shell part during and at the completion of the drawing process. It is also conceivable that the trimming area of the drawing punch is increased and the forming area of the drawing die is formed recessed or a combination of recessed and raised areas, for example the trimming area of the drawing punch with corresponding raised and recessed forming areas in the drawing die is used.

Runs the cutting contour of the drawing punch or the

Drawing dies through the frame, floor and optionally the

Flanged portion of the half-shell, the shell part can be completely cut out during the drawing process from the formed board. This makes it possible, as in a conventional deep-drawing process, for example in

Flange area additional material available too

which can flow during the drawing process to form the flange specifically. excess

Material can then be removed via the cutting contour of the shell part, so that high-dimensional edge portions of the shell part, for example, in the flange to

Can be made available.

To the cutting forces, which during the hehvorgangs

occur, to decrease, according to another

Design of the device, the cutting contour between the cutting area of the drawing punch and the molding area of

Drawing dies in the floor and optionally in the flange area in Lengthwise varying engagement heights on. Due to the varying engagement heights, it is ensured that during the retraction of the drawing punch into the drawing die the engaged forming areas or cutting areas of the drawing die and the drawing die are about to complete

Drawing process to different depths of entry of

Pulling stamp engaged and thus a continuous separation process along the cutting contour, which point or area starts, is guaranteed. Due to the fact that the shape area and the cut area of the drawn board do not extend along the entire length of the cutting contour

be separated at the same time, it is ensured that the cutting forces remain moderate and the "cutting stroke" known in the art can be substantially prevented.

Preferably, the various engagement heights between the molding area and the Beschni tbereich the draw punch and / or the drawing die are provided by a designated inlet contour. The inlet contour can be different

Shapes have. Thus, it is possible, for example, by a linear inlet contour, which has varying inclinations in the cutting contour direction, different

To ensure engagement heights.

According to a further embodiment of the device according to the invention in the drawing punch a round inlet contour at least partially in areas of the cutting contour of the

Drawing punch provided in which a cutting edge is disposed in the corresponding region of the drawing die and / or in the drawing punch at least partially a cutting edge in the areas of the cutting contour of the drawing die provided in which a round inlet contour is provided in the drawing die. By the combination of rounder

Inlet contour, i. the inlet contour has a radius instead of a "sharp" cutting edge, and "sharp"

Cutting edge can be done simultaneously during the drawing process with the initiation of the cutting process, an improved centering of the drawing punch in the drawing die. This results in a particularly accurate cut. It is also conceivable to use two striking "sharp" cutting edges.

Preferably, at least the parts forming the Schneidko structure of the drawing punch and / or the drawing die as at least

interchangeable inserts designed as these increased

Wear and are then easily replaced.

According to a further embodiment of the device optionally a planar board support area is provided, so that the board in a simple manner before forming and

Trimming, for example, automatically, can be inserted into the device.

According to a next embodiment of the device, particularly good cutting results could be achieved in that the inlet contour has at least a radius of 0.5 mm and the cutting edge has a radius of 0.05 mm, in particular 0.02 mm maximum. As a result, a particularly good centering of the drawing punch when pulling and trimming the board is achieved, so that a very good Maßha11igkeit can be ensured. Finally, during the drawing process, the flow of material can be additionally controlled by providing a hold-down device for holding down the sheet to be pulled during drawing.

According to a next teaching of the present invention, the object indicated by a method for producing shell parts with a bottom, frame and optionally a flange portion of a flat or preformed

Soldered circuit board by pulling using the device according to the invention, wherein a metal circuit board,

preferably steel, is inserted into the device and by retracting the drawing punch in the drawing die the

Pulled board and during the forming process at least in the bottom and Zargenbereich by the provided

Cutting contour is cut so that a trimming area and a molding area of the board is at least partially separated and a finished shell part, which substantially the shape of the forming region of the drawing die and the

Drawing dies is produced. As already explained above, it is achieved by the inventive method using the device according to the invention that from a flat or preformed circuit board, a shell part can be produced preferably in a final drawing process, which at least in the bottom and

Curb area is cropped. With the method according to the invention shell parts can be produced in a particularly economical manner. According to one embodiment of the method, this is formed by the forming region of the drawing die and the drawing die Shell part with completion of the drawing process completely separated from the trim area.

Alternatively, it is also possible according to a further embodiment of the method, along the cutting line partially material, preferably in the form of webs, to stand, i. to produce an interrupted cut line, whereby the shell part is at least partially still connected to the trim area and at the same time can be removed from the tool. In a further separation process then the

Cutting area separated from the good part.

In order to keep the cutting forces moderate during trimming of the board and to substantially prevent the so-called "cutting stroke", this is preferably done

Trimming the board in the ground and optionally in the

Flange area at least partially continuously starting from the first engaged areas of Sehneidkontur between the molding area and trim area of the drawing punch and drawing die. In that not the full

Cutting contour is engaged at a certain depth of entry of the drawing punch, it is possible to achieve a continuous trimming the board during the drawing process or at the completion of the drawing process.

Finally, it is particularly advantageous for steel blanks when these blanks are hot worked. In a hot Umfor a steel plate is the board

preferably heated to a temperature above the AC3 - temperature point, hot formed, so that there is a more easily formed structure in the board. The board is in the closed state of the tool quenched, a press hardening can be achieved, provided that the material of the board is a transformation into an im

Substantial martensitic structure allows. In addition, the invention is based on

Embodiments will be explained in more detail in conjunction with the drawings. The drawing shows in

1a) in a perspective view of a typical shell part, which is to be produced with the device according to the invention,

Fig. 1b) is a schematic plan view of a

to reshape the board before pulling and

Trimming,

Fig. 2 to 4 in a schematic sectional view along the section line S in FIG. la)

Embodiment of a device with inserted board during different times of the drawing process,

Fig. 5 and 6 in a perspective view

Embodiment of a deep-drawn and cut board to different

Times of the drawing process,

Fig. 7 in a perspective view of the

Pulling die of the exemplary embodiment from FIG. 2 to 6, Fig. 8 in a perspective view the

Drawing punch of the embodiment of FIG. 2 to 6 and FIG. 9 schematically shows an exemplary course of the

Engagement height along the cutting contour in the floor and optionally in the flange area.

First, Fig. la) in a perspective view of a shell part 1 with a bottom portion 2, a

Frame area 3 and a flange area 4. A

corresponding shell part 1 can for example for

Manufacture of a support of a motor vehicle can be used, wherein the shell part 1, for example, connected to a further shell part on the flanges 4 wi d and can form a stable hollow body. Furthermore, FIG. la) a section line S, which indicates the section line, in which Figs. 2 to 4 are shown. Starting material, for example, the in Fig. lb) in a schematic plan view shown board 5, which has a trimming portion 5a and a forming portion 5b, wherein in the present embodiment, the

Trim area 5a is arranged circumferentially around the mold area 5b. The trimming area 5a forms the area of the board, which after forming and trimming is no longer part of the finished shell part 1. Corresponding trim and shaping areas are also provided in the device for producing the shell parts in order to differently shape and separate the different areas. An embodiment of an apparatus for producing a shell part 1 from a circuit board 5 along the

Section line S is shown in FIG. 2 shown. Fig. 2 shows a planar board 5, which is inserted into a drawing die 6. The drawing punch 7 comprises two hold-downs 7a, with which the material feeder can be controlled when pulling.

In addition, the drawing punch 7 has a trimming area 8 and a forming area 9. The drawing die 6 also has a trimming area 8 'and a forming area 9'. The molding area 9 of the drawing punch 7 has the inner mold 10 (FIG. 1) of the shell part and the mold area 9 'of the drawing die 6 has the outer mold 11 of the finished shell part 1. Of the

Trimming area 8 of the drawing punch 7 forms with the

Forming area 9 'of the drawing die a cutting contour 12, which makes it possible to separate the molding area 5b of the formed board 5 and thus the shell part 1 at least in the bottom area 2 and in the frame area 4 from the cutting area 5a of the board 5. The separation takes place during the drawing process, as shown in FIGS. 3 and 4 is shown. The cutting contour 12 is preferably provided by inserts 7b, 6a both in the drawing punch 7 and also in the drawing die 6 in order to be able to carry out a simple replacement when worn.

As shown in FIG. 3, first of all the drawing punch 7 dips into the drawing die 6 and deforms the blank 5 with the protruding cutting area 8 in such a way that the blank is in the forming area 9 resp. 9 'of the drawing die 6 and the drawing punch 7 is pulled wrinkle-free. This is ensured, for example, by the fact that, as in the present embodiment of FIG. 3 and 4, the molding area 9 of FIG

Drawing punch is formed recessed relative to the trimming area 8 of the drawing punch, wherein the height difference a between the cropping area and the shaping area of the

Ziehs empels at least the wall thickness of the board is. As shown in FIG. 3 also shown, the forming portion 9 'of the drawing die at the transition to the trimming area 8' one

Einlaufrundung 13 on. This Einlaufrundung 13 tesse t together with the provided in the drawing punch in the transition from the mold area 9 in the trimming area 8 cutting edge 14 a centering of the drawing punch without consuming

Leadership measures. If the drawing punch 7 now dips even deeper into the drawing die 6 and reaches its end position, the cutting edge 14 and the inlet rounding 13 make up the

Shell part 1 in the molding area of the trimming portion 15 of the formed board separated, so that the cutting line through the frame portion 3 and the bottom portion 2 of the shell part 1 extends. Preferably, the trimming area 8 of the

Drawing punch 7 or the trimming area 8 'of the drawing die 6 also circumferentially around the flange portion 4 of the finished

Shell part 1, so that the edges of the flange 4 are cut during the drawing process and thus are free of influences of the drawing process.

The Fig. FIGS. 5 and 6 show, in a perspective view, the drawing and cutting process on a reshaped board 5, which has a trimming area 5a and a forming area 5b. As shown in FIG. 5, the cutting operation on the frame 3 of the later shell part 1 begins during the drawing process. As the drawing process progresses, the shell part 1 or the shell part 1 is opened. the forming area 5a of the board is completely removed until completion of the drawing process, FIG. 6. The trimming is preferably carried out both in the frame area 3 and in the bottom area 2. In the illustrated Embodiment additionally, the flange 4 is cut free at the end of the drawing process.

Fig. 7 and FIG. 8 show an embodiment of the

Drawing punch 7 and the drawing die 6 in one

perspective view. In Fig. 7, it can be clearly seen that the forming area 9 'in the drawing die is raised in relation to the immediately adjacent cutting area 8'. In return, in the drawing punch 7, which in FIG. 8, the molding area 9 is formed recessed with respect to the immediately adjacent trimming area 8. This ensures that over the projecting areas of the trimming area 8 of the drawing punch 7, the board can be pulled wrinkle-free and without damage by the "sharp" edges of the tool to then the shape of the molding area 9 'or 9 of the drawing die 6 respectively of the drawing punch. 7 to accept.

At the same time, the shell part 1 is completely trimmed over the cutting contour 12 of the drawing punch 7 or cutting contour 12 'of the drawing die 6. In the Zargenbereich it comes to a complete overlap of the cut edges of the drawing punch 7 and the drawing die. 6

In Fig. 9 is now schematically the cutting contour 12 of

Drawing stamp 7 for the soil and possibly. flange

shown. The engagement height 16, ie the height at which the drawing punch 7 and the drawing die 6, the board 5 in

Engaging and cutting is shown as section line 16. The section line 16 shows a varying height, so that the cutting process begins first in the areas 16a and increases with increasing depth of entry of the

Drawing punch continues in the direction of the arrow. As a result, the cutting forces can be kept moderate. For the course of the Engagement line 7 of the cutting contour 12 are different forms conceivable, for example, a linear, a

wavy or, for example, a sawtooth

Course .

In the illustrated embodiment, the hehstempel 7 is equipped with a recessed molding area 9. The

Drawing die 6 of the embodiment has a raised mold portion 9 '. It is also conceivable, as already stated, that the drawing die 6 a recessed

Forming area and the drawing punch 7 a protruding

Forming area or a combination of both is provided. By using the device according to the invention, as already explained, a plane or for example

formed preformed board 5 in a final drawing operation to a shell part 1 with optional flange portion 4, and are cut at the same time ready. The typical

Head trim of the drawn parts, which usually takes place in several operations, is then no longer

necessary. The production of shell parts 1 can be made significantly more economical.

Claims

Pat ent to sayings

Device for producing shell parts (1) with at least one base (2), one side (3) and optionally one flange area (4) from a flat or preformed blank (5) with a drawing die (6) and a drawing punch (7 ), wherein the drawing die (6) has a shaping area (9 ') and at least one trimming area (8'), the shaping area (9') of the drawing die (6) having the outer shape (11) of the drawing die (6) when the drawing process is completed cutting shell part (1) in the bottom

(2), frame (3) and optionally in the flange area (4), the drawing die (7) has a shaping area (9) and at least one trimming area (8), the shaping area (9) of the drawing die (7) at completion During the drawing process, the inner shape ( 10 ) of the shell part (1) to be drawn and cut with the base, frame and optional flange area (2,

3,

4) has,

This means that the trimming area (8) of the drawing die (7) forms a cutting contour (12) with the shaping area (9 ') of the drawing die (6), with which the trimming and cutting parts are separated during and at the end of the drawing process

Forming area (5a, 5b) of the board

(5) at least in the frame, base (2,3) and optionally in the flange area (4) of the finished shell part (1) can preferably be carried out in the last drawing process. Device according to claim 1,

This means that the shaping area (9) of the drawing die (7) is deepened in comparison to the trimming area (8) of the drawing die (7) and the shaping area (9 ') of the drawing die (6) is deepened in comparison to the trimming area (8') of the drawing die

(6) increased

is trained .

Device according to claim 1 or 2,

This means that the cutting contour runs through the frame, base and flange area (2,3,4) of the shell part (1).

Device according to one of claims 1 to 3,

This means that the cutting contour (12) between the trimming area (8) of the drawing die is marked

(7) and forming area (9 ') of the drawing die (6) in the base and optionally in the flange area (3, 4) in

Has engagement heights (16) that vary in the longitudinal direction.

Device one of claims 1 to 4,

there is a marked sign between the shaping area (9,9') and the trimming area (8,

8') of the drawing punch (7) and/or the drawing die (6) an inlet contour (13, 14) is provided.

Device one of claims 1 to 5,

This means that there is a round inlet contour in the drawing die (7), at least partially in areas of the cutting contour (12).

Drawing punch (7) is provided in which

corresponding area of the drawing die (6). Cutting edge is arranged and / or at least partially a cutting edge ( 14 ) in the drawing die (7).

Areas of the cutting contour (12) of the drawing die (6) are provided, in which a round inlet contour (13) is provided in the drawing die (6).

Device one of claims 1 to 6,

This means that the parts of the tendon that form the tendon contour (12) are marked

Drawing punch (7) and/or the drawing die (6) as

interchangeable inserts (7b, 6a) are formed.

Device one of claims 1 to 7,

This means that the inlet contour (13) has at least a radius of mm and the cutting edge (14) has a maximum radius of mm,

9. Device according to one of claims 1 to 8,

This means that a hold-down device (7a) is provided to hold down the circuit board (5) to be pulled during pulling.

Method for producing shell parts with a base, side and an optional flange area from a flat or preformed blank by drawing using a device according to one of claims 1 to 9, wherein the blank is inserted into the device and by inserting the drawing die into the

Drawing die pulled the board and during the

The forming process is trimmed at least in the base and frame area by the cutting contour provided, so that a trimming area and a shaping area of the board are at least partially separated and a finished shell part, which essentially has the shape of the shaping area of the drawing punch and the drawing die, is produced.

1. Method according to claim 10,

This is due to the marked area of the drawing die and the

Shell part drawn by drawing dies with the end of the

Pulling process is completely separated from the trimming area of the board.

2. Method according to claim 10 or 11,

This means that the cutting of the board in the base and optionally in the flange area is carried out at least partially continuously, starting from the areas of the cutting contour that are first in engagement between the shaping area and the trimming area of the drawing die and drawing die.

3. Method according to claims 10 to 12

This means that the board is hot-formed.