EP2512702A1

EP2512702A1 - Method and device for producing a half-shell part

Info

Publication number: EP2512702A1
Application number: EP10795664A
Authority: EP
Inventors: Thomas Flehmig; Konstantinos Savvas
Original assignee: ThyssenKrupp Steel Europe AG
Current assignee: ThyssenKrupp Steel Europe AG
Priority date: 2009-12-17
Filing date: 2010-12-15
Publication date: 2012-10-24
Anticipated expiration: 2030-12-15
Also published as: ES2804765T3; US20170225216A1; CN102665956B; PL2512702T3; US20120282482A1; CN102665956A; KR20120106822A; KR101966404B1; KR20190008440A; DE102009059197A1; PT2512702T; JP2013514185A; HUE051144T2; EP2512702B1; WO2011083008A1; KR20170109086A

Abstract

The invention relates to a method for producing a half-shell part having a drawing mandrel (1) and a drawing die (2). The aim of creating a method for the process-secure and cost-effective production of highly dimensionally stable half-shell parts is achieved by the invention in that, in a single work step, the drawing mandrel is advanced into the drawing die, a sheet metal blank is preformed to a sheet metal raw part having at least one base section (4), at least one frame section (15) and optionally one flange section (23'), wherein during preforming with the drawing mandrel a material excess is introduced either in the base section and the frame section or in the optional flange section of the sheet metal raw part and the sheet metal raw part is finished so as to form a half-shell part (3) and calibrated.

Description

Method and device for producing a

Half-shell part

The invention relates to a method for producing a half-shell part with a drawing punch and a drawing die. Likewise, a device for producing a

Half-shell part with a drawing punch and a drawing die as well as a producible with said method

Haibschalenteil subject of the invention.

In the automotive industry usually closed or open hollow sections are used as structural elements. These are increasingly composed of half-shell parts, whose

Cross sections and material thicknesses are specially adapted to the eweiligen application.

To produce the half-shell parts, sinkers are typically deep-drawn. During the thermoforming will be

inevitably introduced stresses in the half-shell parts, which lead to a springback after the final molding. The springback of the half-shell parts makes j edoch

For example, the exact positioning of the half-shell parts in a die for welding the half-shell parts to a closed hollow profile. In DE 10 2007 059 251 AI has therefore been proposed to preform in a first device from the board first a blank sheet metal, which in the bottom section a

Excess material compared to the produced

Haibschalenteil has. Then this will be Blechrohteil in a further device to a half-shell part finished molded, wherein the existing excess material in the bottom section is displaced into the other sections of the sheet metal blank. This can reduce the amount of springback. There are two, though

Devices and two steps necessary to obtain the desired half-shell part.

From DE 198 53 130 AI a method is also known, with the subsections of a half-shell part, in which both convex and concave structures are present, with improved quality can be thermoformed. For this purpose, a spring-loaded slider is provided in the drawing die. During the downward movement of the drawing punch, the blank in the section in question is first formed between the punch and the corresponding surface of the slider before the blank is deep-drawn as a whole. One

Excess material should be prevented in certain areas. The known method only allows the dimensional accuracy of subsections of the half-shell part to

improve .

Based on the above-mentioned prior art, the present invention therefore an object of the invention to provide a method and apparatus for process-reliable and cost-effective production of high-dimensional half-shell parts. Likewise, a half-shell part should be made available, from which with less effort

make closed or open hollow profiles.

With regard to the method, this object has been achieved according to a first teaching of the invention in that the Making a half-shell part a drawing punch and a drawing die are used and that in a single

Step of the drawing punch is retracted into the drawing die, a board is preformed to a sheet metal blank with at least one bottom portion, at least one frame portion and optionally a flange portion, wherein during the preforming with the drawing punch a surplus of material

is introduced into either the bottom portion and the frame portion or the optional flange portion of the sheet metal blank, and the sheet blank to a half-shell part

Finished and calibrated.

The preforming and / or the final molding can be considered

Cold forming step or be carried out as a hot forming step. During hot forming, blanks are made of steel

usually at temperatures above A _cl , preferably

heated above A _c3 and reshaped. There is one

Microstructure transformation in austenite during hot forming is desired to take advantage of the superior forming properties of this microstructure and subsequent hardening, for example by transformation of austenite to martensite or others

To allow microstructures.

Either in the bottom section and in the frame section in the manufacture of flangeless half-shell parts or in the optional flange section of the sheet metal blank at the

Production of flange-mounted half-shell parts thus there is more material than in the corresponding area of the shark shell part. This material surplus can during

Finishing and calibrating are displaced into the other sections, which is the entire shark shell part

Induces compressive stresses that are in the plastic range, and thus the springback after deep drawing reduced or suppressed. The inventive method thus leads to Haibschalenteilen, which is characterized by a high

Dimensional accuracy, i. low tolerances, distinguished.

In a first embodiment of the method is the

Use of a drawing punch provided, which has at least one in the direction of the drawing die positionable bottom stamp and a corresponding BodenStempelaufnähme. With the arranged in the above position

Bodenstempel is introduced during the preforming of the Blechrohteils de material excess either in the bottom portion and the frame portion or the optional flange portion of the sheet blank. With such an at least two-part drawing die, a surplus of material can be formed in the sheet metal blank in a process-reliable manner during preforming. The production of a drawing punch with a

Positionable bottom punches is also associated with only a small effort and thus low costs.

A next embodiment of the method provides that the sheet metal blank by retracting the Bodenstempeis in the

Bodenstempelaufnähme as soon as the bottom punch has placed on the voltage applied to the drawing die sheet blank,

Finished and calibrated. The blank sheet metal part can thus be held by the bottom punch in a particularly simple manner to the drawing die, so that slipping of the preformed Blechrohteils can be prevented during finish forming and calibrating. By placing the Bodenstempeis on the voltage applied to the drawing blank sheet raw part can also at a very early stage of the final molding and Calibrating the flow of material can be selectively controlled, so that a spring-retardant half-shell part can be provided. The method can be further developed by the fact that the sheet metal blank is trimmed in a single step. The production of a high-dimensional, edged

Haibschalenteils in a single step allows one hand, lower cycle times. On the other hand, a single device can be used. As a result, a greater economy of the method can be achieved.

The sheet metal blank is preferably trimmed using a cutting edge arranged on the drawing punch. The

Cutting edge can be formed on the drawing punch itself. Alternatively, however, it is also possible to provide a cutting plate fastened to the drawing punch, in particular also movably, which has the cutting edge. By using a separate insert, e.g. the fact that the cutting edge and the remaining areas of the drawing die are subjected to a different wear, be taken into account.

A further embodiment provides that the cutting edge is brought into contact with the blank sheet metal part at the same time as the bottom punch is placed on the sheet metal blank resting on the drawing die. The cutting edge thus comes into contact with the sheet metal blank at a moment when preforming is largely completed. The cutting edge then suppresses a further flow of material into or out of the drawing die. By introducing the

Excess material during preforming can the Cutting edge are also brought into contact with a portion of the blank sheet metal, which is exposed to even slight tensile loads, so that the Blechrohelement can be separated at a well-defined location of the waste.

The method according to the invention can also be further developed by pressing the material excess from the bottom section of the sheet metal blank into the frame section and / or the optional flange section of the blank metal blank during the final shaping and calibrating. Thus, not only is there a repression within the area in which the

Material excess was introduced during the preforming, but also in the adjacent frame portion and / or the optional flange portion instead, so that the dimensional stability of the Haibschalenteils can be further improved overall.

The dimensional accuracy of the Haibschalenteils to be produced can be increased in a further embodiment of the method in that the sheet metal raw part using a

Upset at least in a frame portion, preferably in a bottom portion, is compressed. By the

Upsetting can be associated with the deep drawing

superimposed on undesirable inhomogeneous stress and strain distributions and thereby targeted, so that they do not cause unwanted springback. In particular, by upsetting over the entire cross-sectional length half-shell parts can be produced which have a very high dimensional stability in all sections.

Preferably, for this purpose, a to the

Cutting edge subsequent compression surface used, so that with the compression surface at the same time the cut surface of the

Sheet metal blank can be smoothed. In particular, when a frame portion of the sheet metal blank is to be upset, which, for. in the manufacture of flanges

Haibschalenteile, not directly to the cut surface

However, cutting edge and compression surface can also be arranged separately from each other.

A further embodiment of the invention provides that the board at least at the beginning of preforming with a

Hold down is held. The formation of wrinkles during deep drawing, especially in thin boards, can be largely prevented. In addition, the material flow into the drawing die can be specifically controlled with the hold-down device.

In a development of the method, a flangeless shark shell part is produced. Flangeless half-shell parts can be connected with an I-joint to a closed hollow profile, which does not disturb, projecting

Has sections. In addition, weight savings can be achieved in this way.

Alternatively, however, can also be a flanged

Half shell part are produced. With the flange is a flat surface available, with the Haibschalenteil can be easily welded, for example, on flat components. Furthermore, with a flange, a sufficiently large area for bonding the half-shell part to other components can be made available. According to a second teaching of the invention, the above-mentioned object has been achieved by a device having a drawing punch, a drawing die and means for retracting the drawing punch in the drawing die, wherein between the drawing punch and the drawing die a circuit board

can be positioned and with the drawing punch the board is vorformbar to a sheet metal blank, the drawing punch means for

Introduction of an excess of material in either a bottom portion and a frame portion or a

Has optional flange portion of the blank sheet metal part and the sheet metal raw part can be finished to form a Haibschalenteil and calibrated. With the device according to the invention so the transformation from a board to a

high-scale half-shell part in a single tool allows, resulting in a significant cost savings. The means for introducing a surplus of material can be made available within the scope of a device which changes the shape of the drawing punch. For that comes

For example, a vorwölbbare with a pressure medium membrane in question.

However, a simple first embodiment of the device provides a positionable in the direction of the drawing die bottom punches and a corresponding Bodenstempelaufnähme, through which a surplus of material can be introduced during preforming in the sheet metal blank. The production of such a drawing punch is associated with only a small effort, so that such

Device is very inexpensive.

A next embodiment of the device provides that means for trimming, in particular at least one on Drawing punch arranged cutting edge, are provided. This embodiment also makes it possible to carry out trimming with the aid of the same device, so that further cost advantages and time savings can result.

The device can be further configured by the drawing die having an indicia associated with the cutting edge of the drawing punch. When trimming the

Blechrohteils the waste can be displaced in this franking, so that a particularly smooth cut surface can be achieved.

If the depth of the franking according to another

Design of the device corresponds to at least the board thickness of the reshaped board, jamming of the waste can be prevented and the inventive method can be made more reliable process.

Further, a development of the device, in which the drawing die allows an inlet contour, for example a

Einlaufverrundung has, a relief of the

Material flow into the drawing die. An inlet contour also has the advantage that it causes self-centering of the cutting edges when placing them. Preferably, the inlet rounding is associated with the franking.

A further embodiment of the device provides that the cutting edge in completely in the drawing die

retracted position of the drawing punch from an am

Drawing die, in particular at the franking, arranged GegenSchneidkante spaced in the drawing direction or arranged at the same height. If a pressure load of Blechrohteils should be largely avoided, the counter cutting edge of the

Clearance also be arranged at the same height as the cutting edge of the drawing punch.

In comparable manner to the cutting edge, the

Counter cutting edge on the drawing die itself or be formed on a possibly on the drawing die movably mounted counter cutting plate.

In a cutting edge spaced in the direction of deep drawing, in the case of finish-forming and calibrating, the sheet metal blank located in the space between the drawing punch and the drawing die can be subjected to a compressive load, so that the sheet metal blank is compressed. The undesirable inhomogeneous stress and strain distributions present after the drawing operation can be superimposed in this way and converted into newly aligned stresses which suppress unwanted springbacks of the half-shell part, i. its dimensional stability can be improved. The compression over the entire cross section leads to a state of tension, the plastic flow in the entire cross section of the half-shell part

causes.

Another development of the invention provides an adjoining the cutting edge compression surface of the drawing punch. In this way, the sheet metal blank can be specifically compressed at the cutting surface, whereby a particularly smooth cutting surface can be produced. During deep drawing, the sections of the board forming the frame section and / or the bottom section of the sheet metal blank may come into contact with the counter cutting edge. In order to still ensure a flawless flow of material, the counter-cutting edge can be made rounded in a further embodiment.

With the device according to the invention and the

Processes according to the invention can be half-shell parts

are produced, which have a wall thickness W and in which the smooth cut portion of the cut surfaces of the

Haibschalenteils at least one third of the wall thickness W is. Such half-shell parts can at their

Cutting surfaces with other components are particularly well welded in the I-joint.

Wide advantageous properties of the device can be found in the description of the method according to the invention. The present invention will now be described with reference to a

Exemplary embodiments illustrative drawing explained and illustrated. In the drawing show

Fig. la - c a first embodiment of a

Device according to the invention in different

States in cross section;

Fig. 2 a with the in FIG. 1 shown devices producible embodiment of a

Haibschalenteil in perspective view; the sectional edge of the half-shell part shown in Figure 2 in cross-section compared to the cutting edge of a half-shell part of the prior art. a section of a second

Embodiment of a device according to the invention in various states in cross section; a third embodiment of a

device according to the invention in various states in cross section; Fig. 6 a with the in FIG. 5 can be produced embodiment of a producible

Half-shell part in perspective view;

Fig. 7a-c show a fourth embodiment of a

Device according to the invention in different

States in cross section and

Fig. 8 with the in Fig. 7 can be produced exemplary embodiment of a device shown

Haibschalenteils in perspective view.

The in Fig. 1 has a device shown

Drawing punch 1, which can be retracted by means not shown for retraction into the drawing die 2, wherein he in the in Figs. la to 1c eweiis shown

Positions can be brought to a board 17 first a sheet stock 5 and then from the

Blechrohteil 5 a half-shell part 3 produce.

The drawing punch 1 has means for introducing a

Excess material in a bottom section 4 of the

Sheet metal stock 5 on. It has a shape that can be changed by a bottom punch 6, which is arranged displaceably in a bottom punch holder 7. The drawing die 2 facing edges 8 and 9 of the bottom punch 6 are

rounded, so the risk of kinking in the

Bottom portion 4 of the sheet metal blank 5 can be reduced.

In addition, a cutting edge 10 and an adjoining compression surface 11 are formed on the drawing punch 1. The compression surface 11 is substantially normal to the deep drawing direction, i. for retraction of the drawing punch 1 in the drawing die 2, aligned.

The drawing die 2 has a franking 12 with a

Enlargement 13 on, the stepwise in the

Frame section 15 of the finished half-shell part 3

imaging draw frame portion 16 merges, wherein a counter cutting edge 14 is formed. The franking 12 is so wide and deep that during deep drawing the board 17 is not hindered by the counter cutting edge 14.

First, according to the one shown in Fig. La

Condition a board 17 between the drawing punch 1 and the drawing die 2 is arranged. The board 17 with the thickness P is held with a holding-down device 18 on the drawing die 2. The bottom punch 6 is located in a direction towards the Pulling die 2 protruding position and has contact with the board 17th

With the means for retraction, not shown, which may be formed mechanically, pneumatically or hydraulically, now drawing dies 1 and drawing die 2 are brought into the position shown in FIG. Lb. As a result, the board 17 is preformed into a sheet metal blank 5 with a frame section 15 and a bottom section 4. With a lock, not shown here, the bottom punch 6 is locked in the protruding position. However, it is also conceivable to keep the bottom punch 6, for example by a hydraulic or pneumatic cylinder or a spring during the preforming in the above position.

The board 17 is of the hold-18 so on the

Pulling die 2 held that on the one hand pulled material underneath v / ground, but on the other hand, a bulging of the board 17 and a concomitant wrinkling is avoided.

Through the protruding bottom punch 6 a slack to the desired geometry of the soil is formed, i. one

Excess material introduced into the bottom portion 4 of the sheet metal blank 5. In the area of the inlet runout 13, the sheet metal blank 5 is located on the franking 12. The bottom punch 6 sets in the position shown in Fig. Lb on the voltage applied to the drawing die 2 sheet bar 5. At the same time, the cutting edge 10 of the drawing punch 1 comes into contact with the sheet metal blank 5. In this position, the locking of the bottom punch 6 is now released, so that the bottom punch 6 is pushed in further retraction of the drawing punch 1 in the drawing die 2 in the bottom punch holder 7. In the case of a bottom ram held in a protruding position with a hydraulic or pneumatic cylinder or spring, it is sufficient that the means for retraction overcome the forces exerted by cylinders or springs. As a result of the cutting edge 10, as the drawing die 1 and drawing die 2 approach closer, local stresses in the sheet metal blank 5 are produced at a precisely defined point, so that a crack is formed and the blank stock 5 is trimmed. The waste 19, ie the unused material of

Board 17, is doing in the franking 12 of the

Pulling 2 pushed out.

At the same time, as indicated by arrow, the at

Preforms generated excess material from the bottom portion 4 and the frame portion 15 in the entire sheet metal blank 5 pressed. The conditional by the deep drawing of the board 17 voltages in the frame portion 15 are thus targeted

aligned. The resilience of a Halbschalenteiis manufactured with this device is therefore at most pronounced low and increases the dimensional stability of Halbschalenteiis.

In the position shown in Fig. Lc, the drawing punch 1 is fully retracted in the drawing die. He is at bottom dead center. The drawing punch 1 and the drawing die 2 essentially form a negative image of Innenbzw. Outer contour of the Halbschalenteiis to be produced. The cutting edge 10 of the drawing punch 1 is spaced in the drawing direction to the drawing die. 2

associated counter-cutting edge 14 is arranged. As a result, in the course of the final molding and calibration of the

Sash portion 15 are compressed. This also contributes to the high dimensional accuracy of the finished, in FIG. 2

shown, flangeless half-shell part 3, which is characterized in particular by a relatively smooth cut surface 20.

With respect to the wall thickness W of the invention

Half shell part 3 is the smooth cut portion of

Section surface 20, as shown schematically in Fig. 3a in comparison to a Haibschalenteil from the prior

Technique (Figure 3b), more than a third. Accordingly, the illustrated Haibschalenteil 3 can be welded in a particularly simple manner with other components, especially with a Haibschalenteil produced with a comparable device, in the I-joint to a closed hollow profile.

In the Fig. 4 is a section of an alternative

Embodiment of an apparatus for producing a flangeless half-shell part 3 'shown. This also has a drawing punch 1 'with a bottom punch 6' and a drawing die 2 'on. The franking 12 'is not gradual, but with a slope 21' in the

Drawing die frame section 16 '. The slope 21 'has the advantage over the step-like transition that a counter cutting edge 14' is formed with a duller angle. Thus, their wear can be reduced become. In addition, it is easier to manufacture. On the other hand, a step-like transition provides less resistance to the waste to be displaced during trimming and reduces the risk of jamming of the waste in the device. In addition, the bevel 21 'causes self-centering of the cutting edge 10' during trimming.

In the same way as in the apparatus shown in FIG. 1, the cutting edge 10 'is in addition

completely in the drawing die 2 'retracted position of the drawing punch 1' in the deep drawing direction deeper than that

Counter-cutting edge 14 '(see Fig. 4e). Accordingly, in the apparatus shown in Fig. 4, the entire cross section of the shark shell part 3 'is compressed and transferred to a plastic state.

Both a franking having a slope and a step-like franking can be combined with an arrangement of the cutting edge or the counter-cutting edge, in which the cutting edge and counter cutting edge in

completely in the drawing die retracted position of the drawing punch are at least the same height.

With regard to the course of the transformation of the board 17 'over a blank sheet metal part 5' to a half-shell part 3 'is to the explanations to FIG. 1 referenced.

Finally, FIG. 5 shows an embodiment of a

Device according to the invention with the flange-shaped half-shell part 3 '' can be produced. According to the devices described above is also in the in Fig. 5 shown a drawing punch 1 '' with a Base punch 6 '' present, which additionally comprises a Flanschformstempel 33 ''.

The drawing die 2 '' has a drawing die bottom portion 22 '' forming the bottom portion 4 '' of the sheet metal blank 5 '', a frame portion 14 '' of the blank sheet 5 ''

forming Ziehgesenkzargenabschnitt 16 '' and a the

Flange portion 23 '' of the sheet metal blank 5 '' shaping

Pulling die flange portion 24 ". The transition 25 '' between Ziehgesenkflanschabschnitt 24 '' and

Drawing die frame section 16 '' has a

Infeed or rounding a drawing radius.

Correspondingly, the bottom punch 6 '' comprises a bottom portion 26 '' and a

Bodenstempelzargenabschnitt 27 '' and the Flanschformstempel 33 '' a Flanschformstempelabschnitt 28 '' with a

Cutting edge 10 ''. This cutting edge 10 '' is assigned on the side of the drawing die 2 '' an oversized bevel 21 '', which allows the self-centering of the cutting edge 10 ''.

For producing the flange-shaped half-shell part 3 ", as shown in FIG. 5a, first the board 17 '' between the drawing punch 1 '' and the drawing die 2 ''

arranged. The bottom punch 6 '' of the drawing punch 1 '' is located in a direction in the direction of the drawing die 2 '' projecting position. The board 17 '' is from a

Hold-down 18 '' outside the Ziehgesenkflanschabschnittes 24 '' held on the drawing die 2 ''. The counter-holding portion 30 '' of the drawing die 2 '', against which the board 17 '' with the hold-down 18 '' is held, is opposite Pulling Ges.fianschabschnitt 24 '' further from the

Ziengesenkbodenabschnitt 22 '' removed.

By retracting the drawing punch 1 '' in the drawing die 2 '' is first a blank sheet 5 '' preformed, wherein in

Flange portion 23 '' of the sheet metal blank 5 '' a

Material excess is generated (see Fig. 5b). Of the

Flange portion 23 "of the blank sheet metal 5" experiences both convex and concave bending as a result of the staggered planes of pull die flange portion 24 "and counterpart portion 30" when the blank is pulled. ,

Simultaneously with the placement of the Bodenstempeis 6 '' on the resting on the Ziehgesenkbodenabschnitt 22 '' Blechrohteil 5 '' gets the cutting edge 10 ' ¹ contact with the

Sheet metal raw part 5 ''.

After placing the bottom punch 6 '' on the sheet metal blank 5 '' moves only the Flanschformstempel 33 'in

Direction drawing die 2 '' and the sheet metal blank 5 '' is to a flange-shaped half-shell part 3 '' with the

Cutting edge 10 '' trimmed, finished and calibrated. ,

In the in Fig. 5c, the flanged-die punch portion 28 '' is formed as an offset contour of the die-face flange portion 24 ''. As shown in FIG. 5c, the drawing punch 1 '' has been retracted completely into the drawing die 2 ''. The offset has the value of the thickness P '' of the board 17 '', so that by the excess material of the flange portion 23 '' this is compressed. The offset between

The drawing die bottom portion 26 "and the drawing die bottom portion 22" correspond to the thickness P "of the board 17". Between Drawing die frame portion 16 "and die set portion 27", the offset is increased by a drawing nip, not shown in Figures 5 a-c, to allow material flow between the dies during finish forming and sizing

allow different sections of the sheet metal blank 5 ''.

Thus, for example, a high-dimensioned, trimmed shark shell part 3 "can be produced with the device, which is shown in a perspective view in FIG. 6.

Another variant of an embodiment form a

Device according to the invention is shown in FIG. 7, with which a further form of a flange-less half-shell part 3 '' ', as shown in Fig. 8 in a perspective view, can be produced.

The only difference from that shown in Fig. 5a - c

Device is that the Flanschformstempel 33 '' 'laterally a recess with a cutting edge 10' '', so that after trimming the Blechrohteils 5 '' 'and by further closing the device of

End portion of the sheet metal blank 5 '' 'is transferred into the recess. The flangeless half-shell part 3 '' 'is finished shaped and calibrated.

The high dimensional accuracy of the flangeless or flange-mounted half-shell parts 3, 3 ', 3 ¹ ', 3 ' ¹ ' is promoted by the fact that is transferred by the compression of the entire cross-section in a plastic state and thus stresses can be targeted.

Claims

claims

Method for producing a half-shell part with a drawing die (1, 1 ', 1' ', 1' '') and a drawing die ^ 2 ^ 2 2 2)

In a single step, the drawing punches (1, 1 ', 1' ', 1' '') are fed into the drawing die (2, 2 ', 2' ', 2' '') in a single step.

is retracted, a board (17, 17 ', 17' ', 17' '') to a sheet metal blank (5, 5 ', 5' ', 5' '') with at least one bottom portion (4, 4 ', 4' ',' ''), at least one frame portion (15, 15 ', 15' ', 15' '') and optionally a flange portion (23 '', 23 '' ') is preformed, wherein during the preforming with the drawing punch ( 1, 1 ', 1' ', 1' '') an excess of material either in the

Bottom portion (4, ', 4' ', 4' '') and the frame portion (14, 14 ', 14' ', 14' '') or the optional

Flange portion (23 '') of the sheet metal blank (5, 5 ', 5' ', 5' '') is introduced, and the sheet metal blank (5, 5 ', 5' ', 5' '') to a Haibschalenteil (3, 3 ', 3' ', 3' '') is preformed and calibrated.

Method according to claim 1,

characterized in that a drawing punch (1, 1 ', 1' ', 1' '') is used, the at least one in the direction of the drawing die (2, 2 ', 2' ', 2' '') above positionable bottom punches (6 , 6 ', 6' ', 6' ''), and with the bottom punch (6, 6 ', 6' ', 6' '') arranged in the above position during preforming of the sheet metal blank (5, 5 ', 5 '', 5 '' ') the

Excess material in the bottom portion (4, 4 ', 4'', 4 ''') and the frame portion (15, 15', 15 '', 15 ''') and / or the optional flange portion (23'',23''') of the sheet metal blank (5, 5 ', 5'' , 5 ''') is introduced.

Method according to one of claims 1 or 2,

d a d u r c h g e k n n e, e e s, the sheet metal blank (5, 5 ', 5' ', 5' '') by retracting the Bodenstempeis (6, 6 ', 6' ', 6' '') in the

BodenStempelaufnähme (7, 7 ', 7' ', 7' ''), as soon as the

Bottom punch (6, 6 ', 6' ', 6' '') on the on the drawing die (2, 2 ', 2' ', 2' '') adjacent sheet metal blank (5, 5 ', 5' ', 5' '') has been set up, finished and calibrated.

Method according to one of claims 1 to 3,

d a d u r c h e k e n e, e s, the sheet blank (5, 5 ', 5' ', 5' '') in the single

Working step, preferably using a at the punch (1, 1 ", 1 '', 1 '' ') arranged cutting edge (10, 10', 10 '', 10 '' '), is trimmed.

Method according to one of claims 2 to 4,

characterized in that the cutting edge (10, 10 ', 10' ', 10' '') coincides with the placement of the bottom punch (6, 6 ', 6' ', 6' '') on the drawing die (2, 2 ', 2' ', 2' '') lying sheet blank (5, 5 ', 5' ', 5' '') with the sheet metal blank (5, 5 ', 5' ', 5' '') is brought into contact ,

Method according to one of claims 1 to 5,

d a n d u r c h e s e n c e s, during the final molding and calibration of the

Excess material from the bottom section (4, 4 ', 4'',4''') of the sheet metal blank (5, 5 ', 5'',5''') in the

Frame section (15, 15 ', 15' ', 15' '') of the sheet metal blank

(5, 5 ', 5' ', 5' '') is pressed. 7. The method according to any one of claims 1 to 6,

The sheet metal blank (5, 5 ', 5' ', 5' '') is produced using an upsetting surface (11, 11 '', 11 '' '), in particular using a cutting edge (10).

subsequent compression surface (11), at least in one

Frame portion (15, 15 '', 15 '' '), preferably in a bottom portion (4, 4' ', 4' ''), is compressed.

8. The method according to any one of claims 1 to 7,

That is, the board (17, 17 ', 17 ", 17"') is held at least at the beginning of preforming with a hold-down device (18, 18 ', 18 ", 18"'). 9. The method according to any one of claims 1 to 8,

In this case, a flangeless sheath shell part (3, 3 ', 3' '') or a flange-mounted half shell part (3 '') is produced from the sheet metal blank (5, 5 ', 5' ', 5' '').

10. An apparatus for producing a half-shell part with a method according to one of claims 1 to 9, with a drawing punch (1, 1 ', 1' ', 1' '') and a drawing die (2, 2 *, 2 '', 2 '"),

characterized in that the device comprises means for retracting the drawing punch (1, 1 ', 1'',1''') into the drawing die (2, 2 ', 2'',2''') , between drawing dies (1, 1 ', 1'',1''') and drawing die (2, 2 ', 2'', 2 ¹ '') a board (17, 17', 17 '', 17 ''') is positionable, the board with the drawing punch in a sheet metal blank (5, 5', 5 '', 5 ''') is preformable, the drawing punch (1, 1', 1 '', 1 ''') Means for introducing an excess of material either in a bottom portion (4, 4 ','',4''') and a

Frame section (15, 15 ', 15'', 15 ¹ '') or a

optional flange portion (23 ¹ ', 23''') of

Blechrohteils (5, 5 ', 5' ', 5' '') and has the

Sheet metal blank (5, 5 ', 5'',5''') with the drawing punch (1, 1 ', 1'', 1 ¹ '') to a Haibschalenteil (3, 3', 3 '', 3 '' ¹ ) can be finished and calibrated.

Device according to claim 10,

characterized in that the drawing punch (1, 1 ', 1' ', 1' '') at least one in the direction of the drawing die (2, 2 ', 2' ', 2' '') above positionable bottom punches (6, 6 ', 6 '', 6 '' ') and optionally a corresponding Bodenstempelaufnähme (7, 7', 7 '', 7 '' ').

Device according to one of claims 10 or 11,

There is provided a means for trimming, in particular at least one cutting edge (10, 10 ', 10' ', 10' '') arranged on the drawing punch (1, 1 ', 1' ', 1' '').

Device according to claim 12,

characterized in that the drawing die (2, 2 ', 2'',2''') at least one of the cutting edge (10, 10 ', 10'',10''') of the drawing die (1, 1 ¹ , 1 '', 1 ''') associated with franking (12, 12', 12 '', 12 ''').

14. Device according to claim 13,

characterized in that the depth (T, Τ ', T' ', Τ' '') of the franking (12, 12 ', 12' ', 12' '') of at least the board thickness (P, P ', P' ', P '' ') of the reshaped board (17, 17', 17 '', 17 '' ') corresponds.

15. Device according to one of claims 13 or 14,

For example, the drawing die (2, 2 ', 2' ', 2' '') has an entry recursion, in particular one arranged at the franking

Einlaufverrundung (13, 13 ', 13' ', 13' ''), comprising.

16. Device according to one of claims 13 to 15,

characterized in that the cutting edge (10, 10 ', 10' ', 10' '') in fully retracted in the drawing die position of the drawing punch in the drawing direction spaced from one of the drawing die (2, 2 ', 2' ', 2' '' ), in particular at the franking (12, 12 ', 12' ', 12' ''), arranged GegenSschneeidkante (14, 14 '', 14 '' ') or at least at the same height as the

Against cutting edge (14 ') is arranged.

17. Device according to claim 16,

characterized in that the counter cutting edge (14, 14 ', 14'',14''') is rounded.

18. Device according to one of claims 12 to 17, characterized in that the drawing punch (1, 1 ', 1'',1''') a compression surface (11, 11 '', 11 ''') _/ · in particular a directly to the

Cutting edge (10) subsequent compression surface (11).

Half-shell part produced by a process according to one of claims 4 to 9, in particular with a

Device according to one of claims 13 to 18,

It has a wall thickness W and the smooth cut portion of the cut surfaces (20, 20 '', 20 '' ') of the half-shell part (3, 3', 3 '' ') is at least one third of the wall thickness W.