DE102014110169B4 - Ironing apparatus and method for producing a hollow body - Google Patents

Abstract

Ironing device (10) for producing a hollow body (14)
with a drawing punch (11) which can be moved along a longitudinal axis (L) and which has a forming outer surface (15) which is arranged coaxially to the longitudinal axis (L),
with a die tool (12) which has at least one ironing ring (28) arranged coaxially with the longitudinal axis (L),
the drawing punch (11) having a separating edge (26) arranged on a first annular shoulder (24) with a shoulder surface (25) facing the free end (16) of the drawing punch (11), the diameter of the separating edge (26 ) substantially corresponds to the inner diameter of the smallest ironing ring (28),
with at least one driving projection (29) arranged on the drawing punch (11) and having a driving face (30) pointing away from the free end (16) of the drawing punch (11),
wherein the driving projection (29) is closed annularly and has a driving edge (34) which is arranged on a second annular shoulder (31) of the drawing punch (11), and wherein the diameter of the driving edge (34) substantially to the inner diameter of the smallest ironing ring (34). 28).

Description

The invention relates to an ironing apparatus and a method for producing a hollow body from a hollow body blank. The ironing apparatus has a drawing punch, which is movable along a longitudinal axis via a drive. During a working stroke, the drawing punch moves or pulls a hollow body blank through a die tool with at least one ironing ring. Between a coaxially arranged to the longitudinal axis Umformaußenfläche the drawing punch and the ironing ring, the hollow body blank and in particular its wall portion is formed to finally form the hollow body. The ironing device performs an ironing process.

During each stroke of the drawing punch in a working stroke, a hollow body is produced or reshaped. At the end of the working stroke, the direction of movement of the drawing punch is reversed and the drawing punch is moved back by a return stroke in a Rückhubrichtung by the die tool to finally move another hollow body blank during the subsequent stroke again by the die tool.

An ironing apparatus with a draw punch and a cooperating die tool is known from DE 15 27 947 A known. The drawing punch has two longitudinal sections with different diameters, which are connected via an annular shoulder, on which a separating edge is formed. During the working stroke of the drawing punch, an annular edge region of the hollow body blank is separated during the movement of the separating edge by an ironing ring of the die tool. The drawing punch, in the direction of working stroke in front of the annular shoulder, has an area that is conically widened in the working stroke direction. In this area there is a slight gap between the outer surface of the drawing punch and the edge of the formed hollow body. A crimping tool arranged in the return stroke direction in front of the die tool can therefore engage in this gap during the return stroke of the drawing punch and deform it during the return stroke of the drawing punch and strip off the hollow body.

DE 29 815 825 U1 describes a device for producing planters made of coconut fiber random fiber fleece. The coconut fiber random fiber fleece is drawn into a mold by means of a punch and pressed there. The stamp separates the uncompacted coconut fiber random fiber web outside the mold from the compacted coconut fiber random fiber web in the mold.

Out DE 42 25 735 A1 discloses a method and apparatus for trimming and trimming a cylindrical portion of a workpiece. The device has a step stamp with an annular shoulder. When a container is being stretched, the ironed container is separated from a remaining annular remainder of material by an edge at the annular step.

DE 27 58 254 A1 relates to a device for stripping and stripping of one-piece container hulls. The ironing punch has a conical section at a distance from its end face. During stripping, the container along the conical portion on an increasing away from the end face of the punch wall thickness. If, at the end of the ironing operation, the bottom of the container is reshaped, an axial displacement of the ironed container takes place relative to the stamp. Thereby, the edge portion of the ironed container is pulled towards the end face of the punch, and due to the conical punch portion, the container edge is pressed radially outward. The container edge of the ironed container thus has an outer diameter which is larger than the last ironing ring in the die tool. Upon a return stroke of the punch, the peeled container is stripped off the punch.

Based on this prior art, it can be regarded as an object of the invention to improve the ironing apparatus and a method for producing a hollow body.

This object is achieved by an ironing apparatus with the features of claim 1 and a method having the features of claim 13.

The ironing device for producing the hollow body has a drawing punch which can be moved along a longitudinal axis and has a forming outer surface. The Umformaußenfläche is formed by the lateral surface of a cylinder and preferably connects directly to the free end of the drawing punch. The Umformaußenfläche is arranged coaxially to the longitudinal axis.

The ironing apparatus also has a die tool, which is set up, together with the drawing punch and in particular the Umformaußenfläche a hollow body blank during its movement through the die tool to form the hollow body. The die tool has at least one and in particular a plurality of ironing rings, which are arranged coaxially to the longitudinal axis. The diameter of the ironing rings decreases in a working stroke direction along the longitudinal axis L. During a working stroke of the drawing punch in Arbeithemubrichtung is the Hollow body blank moves through the one or more ironing rings, whereby on the one hand its outer diameter and consequently the wall thickness is reduced and on the other hand increases its height in the direction of the longitudinal axis.

The drawing punch has a coaxial with the longitudinal axis first annular shoulder with a separating edge. The diameter of the separating edge is greater than the diameter of the Umformaußenfläche. The first annular shoulder is arranged in the direction of the longitudinal axis at a distance from the free end of the drawing punch. The distance of the separating edge from the free end of the drawing punch determines the length or height of the hollow body produced. Apart from a technically necessary clearance, the diameter of the separating edge corresponds to the inner diameter of the smallest ironing ring of the die tool.

At least one driving projection is also present on the drawing punch. The driver projection is arranged in the working stroke direction behind the separating edge. It has a driving surface facing away from the free end of the drawing punch. This at least one driver surface may be arranged at least in sections at right angles to the longitudinal axis or obliquely to the longitudinal axis. In addition, the at least one driver surface seen in a section parallel to the longitudinal axis have a course that follows a straight line or have a curved and preferably a concave curved course.

The process according to the invention, which can be carried out with the aid of this ironing apparatus, operates as follows:

During a working stroke in a working stroke direction, a hollow body blank is moved by means of the drawing punch through the die tool. When the hollow body blank is moved with the drawing punch through the ironing ring with the smallest inner diameter, this results in the final outer diameter of the hollow body. As soon as the separating edge is moved through this ironing ring, an annular edge region of the hollow body blank is cut off, so that the hollow body produced has a defined height in the direction of the longitudinal axis. In this way, very easily hollow body can be produced with a straight edge and defined height.

After the end of the working stroke, the direction of movement of the drawing punch is reversed and the drawing punch is moved back during a return stroke in a return stroke. In this case, the deformed hollow body is stripped from the Umformaußenfläche in a known per se - in particular by a scraper and / or by a fluid pressure which is generated via an emerging at the free end of the drawing punch fluid channel between the hollow body and the drawing die - and not by the Matrizenwerkzeug moved back.

The at least one driving projection ensures that the separated edge region is conveyed out of the ironing ring or the die tool during the return stroke. Due to the working stroke of this edge region is usually trapped between the drawing punch and the ironing ring. Depending on the toughness or the brittleness of the material of the edge region can not be readily assumed that the separated edge region is removed during the return stroke of the ironing ring. Therefore, according to the invention, the at least one driving projection is present, the driving surface of which runs at least in sections obliquely or transversely to the longitudinal axis and faces away from the free end. The driver surface can therefore attack the severed ring section and take it out of the ironing ring in the return stroke direction. According to the invention it is therefore ensured that separated waste pieces are removed from the die tool and can not lead to quality losses in the production of further hollow bodies.

Preferably, in one embodiment in the return stroke behind the die tool Abstreifeinrichtung present, which may have, for example, a coaxially arranged around the longitudinal axis scraper. The severed ring area is stripped off the drawing punch.

In a further preferred embodiment, a blow-out and / or rinsing device is also present adjacent to the stripping device. By means of a fluid, for example air or a coolant, the separated edge region can be blown out or flushed out and thus removed from the ironing device.

The driving projection is closed annularly and has a driving edge. The driving edge can have the same diameter as the separating edge and is arranged coaxially to the longitudinal axis. The driving edge is arranged on a second annular shoulder of the drawing punch.

The diameter of the driver edge substantially corresponds to the inner diameter of the smallest ironing ring.

In one embodiment, the first annular shoulder and the second annular shoulder are arranged on a common annular projection. At this annular projection, the drawing punch has its maximum diameter.

The second annular shoulder of the drawing punch can be designed at a right angle to the longitudinal axis of symmetry symmetrical to the first annular shoulder with the separating edge.

In another embodiment, a plurality of circumferentially distributed about the longitudinal axis and around the punch arranged Mitnehmervorsprünge exist. Preferably, these several driver projections are arranged in the circumferential direction at a distance from each other, wherein the distances between each two immediately adjacent driver projections may be the same size.

The maximum distance between the at least one driver surface and the at least one shoulder surface and / or the distance of the separating edge from the driver edge is preferably smaller than the height of the at least one ironing ring. The distance between the at least one driver surface and the shoulder surface or the driver edge and the separating edge may be in one embodiment, a maximum of 10 cm to 15 cm and more preferably a maximum of 5 cm to 10 cm. This distance is in one embodiment at most as large as the stroke of the drawing punch, which is required for forming the bottom portion of the hollow body with a corresponding shaping device, for example a so-called dome.

In a preferred embodiment, the at least one cam projection is integrally formed on the drawing die. In particular, the first annular shoulder and the at least one driving projection, for example the second annular shoulder, without seam and joint made of the same material as the drawing punch are formed integrally with the drawing punch. Alternatively, a separate driver part can be arranged on the drawing die, which has the first annular shoulder and / or at least one driver surface.

In one embodiment, a driver part is present, on which the at least one driver projection is formed and which surrounds the drawing die in an annular manner. For example, the driver part can have one and preferably a plurality of spring-elastic finger parts, on each of which a driver surface is formed at the free end of each finger part. It is advantageous if a plurality of resilient finger parts are arranged distributed in the circumferential direction. The resilient finger parts may extend, for example, from a common ring part obliquely away from the longitudinal axis to their respective free end.

It is advantageous if the at least one driver surface in unenergized idle state of the at least one finger part has a maximum distance to the longitudinal axis, which is at least as large as the radius of the ironing ring with the smallest inner diameter.

• Die 1 bis 7 jeweils eine schematische Seitenansicht eines ersten Ausführungsbeispiels einer Abstreckvorrichtung in unterschiedlichen Positionen des Ziehstempels bei seinem Arbeitshub bzw. seinem Rückhub zur Herstellung eins Hohlkörpers,
• 8 ein weiteres Ausführungsbeispiel einer Abstreckvorrichtung in einer schematischen teilgeschnittenen Seitenansicht,
• 9 ein ringförmiges Mitnehmerteil in einer Draufsicht entlang einer Längsachse des Ziehstempels beim Ausführungsbeispiel der Astreckvorrichtung nach 8 und
• 10 und 11 jeweils eine stark schematisierte teilgeschnittene Seitenansicht eines Abstreckrings und eines einzelnen Fingerteils des Mitnehmerteils aus den 8 und 9 in unterschiedlichen Positionen beim Rückhub des Ziehstempels.

Advantageous embodiments of the invention will become apparent from the dependent claims, the description and the drawings. Hereinafter, preferred embodiments of the invention will be explained in detail with reference to the accompanying drawings. Show it:

• The 1 to 7 in each case a schematic side view of a first embodiment of an ironing apparatus in different positions of the drawing punch during its working stroke or its return stroke for producing a hollow body,
• 8th a further embodiment of an ironing apparatus in a schematic partially sectioned side view,
• 9 an annular driver part in a plan view along a longitudinal axis of the drawing punch in the embodiment of the astrecking device according to 8th and
• 10 and 11 in each case a highly schematic partially cutaway side view of an ironing ring and a single finger part of the driver part of the 8th and 9 in different positions during the return stroke of the drawing punch.

In the 1 to 7 is a first embodiment of an ironing device 10 schematically illustrated in each case partially sectioned illustration. The ironing device 10 has one along a longitudinal axis L reciprocating drawing punch 11 on. The movement of the drawing punch 11 along the longitudinal axis L is produced by a drive, not shown, as is usual in drawing presses or ironing presses. The drawing punch 11 can along the longitudinal axis L during a working stroke in a working stroke direction A be moved to a reversal point. After reaching the turning point, the drawing punch 11 against the working stroke direction A along the longitudinal axis L during a return stroke in a return stroke direction R to be moved.

The ironing device 10 also has a die tool 12 on, for forming a hollow body blank 13 to a hollow body 14 with the drawing punch 11 and in particular a Umformaußenfläche 15 of the drawing punch 11 cooperates. The Umformaußenfläche 15 is coaxial with the longitudinal axis L arranged and has for example the shape of a cylinder jacket surface. The Umformaußenfläche 15 closes immediately to a free end 16 of the drawing punch 11 at. At the in working stroke direction A oriented end face 17 can the drawing punch 11 As illustrated by example, a concave forming recess 18 to one in the hollow body 14 into arched ground 19 of the hollow body 14 together with a suitable forming device, in particular a dome 20 ( 4 ) to transform.

By far the free end 16 the drawing punch 11 has a first annular shoulder 24 on. At the first annular shoulder 24, the diameter of the drawing punch increases 11 starting from the Umformaußenfläche 15 , For this purpose, the first ring paragraph 24 a sales area 25 on, in or at an angle to the working stroke direction A is oriented. The sales area 25 connects the Umformaußenfläche 15 with a separating edge 26 , The sales area 25 may be tapered and / or curved in sections. In the embodiment, the sales area 25 concave and may, for example, have a radially curved cross-sectional contour.

The die tool 12 has one and usually more ironing rings on. To simplify the illustration, only a single ironing ring is illustrated in the drawing, namely the ironing ring 28 with the smallest inner diameter. In working stroke direction A becomes the inner diameter of the ironing rings of the die tool 12 smaller. For the operation of the invention, the ironing ring 28 with the smallest inner diameter of importance, which is illustrated in the drawing respectively.

The inner diameter of the smallest ironing ring 28 essentially corresponds to the diameter of the separating edge 26. This can be during the working stroke of the drawing punch 11 when the separating edge 26 through the ironing ring 28 moved with the smallest internal diameter, an annular edge region 13a the hollow body blank are separated, which will be explained later.

The drawing punch 11 also has at least one driver projection 29 with a driving surface 30 on. The driving surface 30 is rectangular or oblique to the longitudinal axis L oriented and pointing at right angles or obliquely from the free end 16 of the drawing punch 11 path. A normal vector starting from the driving surface 30 therefore has at least one directional component in the return direction R , Im, difference has a normal vector starting from the heel 25 , at least one directional component in working stroke direction A , Both the normal vector of the driving surface 30 as well as the normal vector of the shoulder surface 25 can each have a further direction component radially to the longitudinal axis A exhibit.

The driver advantage 29 is in the first embodiment according to the 1 to 7 through a second annular shoulder 31 educated. By way of example, the first ring shoulder 24 and the second ring heel 31 mirror-symmetrical to a plane of symmetry, perpendicular to the longitudinal axis L is oriented.

The driving surface 30 can be analogous to the sales area 25 Sectionally conical and / or curved. In the embodiment, the driving surface 30 concavely curved, wherein the cross-sectional contour may have a curvature along a radius.

The two ring heels 24 . 31 are in the first embodiment described here according to the 1 to 7 through a common annular projection 32 educated. The ring protrusion 32 is cylindrical, for example, and has a cylindrical outer surface 33 that are coaxial with the longitudinal axis L runs. In the transition from the sales area 25 to the cylinder surface 33 is the separating edge 26 educated. On the along the longitudinal axis L opposite side is in the transition between the driving surface 30 and the cylinder surface 33 a driving edge 34 educated.

The diameter of the driving edge 34 corresponds to the diameter of the separating edge 26 and therefore essentially the inner diameter of the smallest ironing ring 28 , It is in this embodiment, only an annularly closed Mitnehmervorsprung 29 intended.

By way of example, the annular projection 32 and therefore both the first and the second annular shoulder 24 . 31 , integral part of the drawing punch 11 and thus without seam and joint with the drawing punch 11 integrally connected.

The driving surface 30 goes in Rückhubrichtung R considered in a stamp outer surface 35 above. The stamp outer surface 35 has the same diameter as the Umformaußenfläche in the embodiment 15 , You may also have a larger or smaller diameter in a modification to this. In any case, the diameter of both the stamp outer surface 35 , as well as the Umformaußenfläche 15 smaller than the diameter of the separating edge 26 and / or the driving edge 34 ,

As in 4 illustrated in the first embodiment of the ironing device 10 coaxial to the longitudinal axis L the dome 20 arranged, in common with the forming recess 18 on the drawing punch 11 this serves to create a concave in the hollow body 14 arched ground 19 train. Such a dome 20 is known in principle, so that can be dispensed with a detailed description at this point. For a better overview is the Domer 20 not illustrated in the other figures of the first embodiment.

In the return stroke direction R behind the die tool 12 is a scraping device 40 arranged, the example according to a scraper 41 having. The scraper ring 41 ha an opening 42 that are coaxial with the longitudinal axis L is arranged and has an inner diameter which is at least as large as the separating edge 26 and / or the driving edge 34 ,

Between the stripping device 40 and the die tool 12 is also a rinsing device 47 arranged. The rinsing device 47 has one or more fluidic flushing channels 48 on, each having a mouth 49. The estuary 49 is approximately in the direction of the longitudinal axis L oriented so that a rinsing fluid F from the mouth 49 between the stripping device 40 and the die tool 12 can be ejected. The rinsing device 47 is only in 7 illustrated schematically.

As explained, instead of the one illustrative flushing channel 48 also several such flushing channels 48 be present, preferably from one or from different directions a Ausspülfluid F emit. Even if different ejection directions are provided for the rinsing fluid, these directions preferably include a maximum of an angle of 90 ° to 120 ° to each other.

The first embodiment of the ironing apparatus 10 according to the 1 to 7 works as described below:

To reshape moves the drawing punch 11 at a working stroke in working stroke direction A the hollow body blank 13 , which in the area of Umformaußenfläche 15 on the drawing punch 11 is arranged, through the die tool 12 with the at least one ironing ring 28 , As explained, in the figures, only the ironing ring 28 illustrated with the smallest inner diameter. During the forming of the hollow body blank 13 on the ironing ring 28 with the smallest inner diameter becomes the cylindrical wall of the hollow body blank 13 so reshaped that in the circumferential direction U around the longitudinal axis L Material at the edge of the hollow body blank at every point 13 over the separating edge 26 flows ( 2 ). With a continued movement of the drawing punch 11 in working stroke direction A becomes the separating edge 26 through the ironing ring 28 moved through with the smallest inner diameter. In this case, the annular edge region 13a of the hollow body blank 13 separated or folded or squeezed. This situation is in 3 illustrated.

After separating the annular edge region 13a becomes the drawing punch 11 continue in working direction A emotional. The height of the hollow body to be produced 14 is by separating the edge area 13a specified and corresponds to the length of the drawing punch 11 between the separating edge 26 and the free end 16 ,

In 4 is the position of the drawing punch 11 shown where the reversal point reached and the bottom 19 with the help of the dome 20 was reshaped. Thus, the stroke is completed and the return stroke in Rückhubrichtung R starts.

As in 4 is to be seen schematically, by the working stroke of the drawing punch 11 the severed edge region 13a between the draw punch and the ironing ring 28 trapped. Depending on the material of the hollow body blank 13 or of the hollow body 14 exists between the drawing punch 11 and the separated edge area 13a no sufficient friction, which causes during the return stroke in Rückhubrichtung R by the sliding movement of the drawing punch 11 at the edge 13a a take away of the edge area 13a he follows. This can lead to loss of quality or defects in subsequent forming processes if a separated edge area 13a or parts thereof in or on the die tool 12 remain.

According to the invention in the first embodiment of the ironing device 10 the diameter of the drawing punch 11 in the region of the stamp outer surface 35 smaller than the driving edge 34 , During the working stroke in working stroke direction A the drawing punch with the stamp outer surface 35 the separated edge region 13a therefore at least in places in the ironing ring 28 involve. During the subsequent return stroke in the return stroke direction R arrives the driver projection 29 to the plant with the separated edge area 13a when the driver projection 29 through the ironing ring 28 with the smallest inner diameter moves through ( 5 ). Thereby, the separated edge portion 13a of the ironing ring 28 away.

As the other possibly existing ironing rings 28 of the die tool 12 all have a larger inner diameter, the separated edge area 13a through all other ironing rings and therefore from the die tool 12 be transported out. It should be noted in this context that the schematic representations according to the 1 to 7 are not to scale and are only intended to explain the principle of the invention. The distances and the size ratios are shown to exaggerate the invention partially exaggerated dimensions.

In 6 it can be seen that the separated edge area 13a completely out of the die tool 12 was removed. In the further return stroke of the drawing punch 11 reaches the edge area 13a in contact with the scraper 41 and is about the driving projection 29 or the second annular shoulder 31 away from the drawing punch 11 stripped.

The stripped edge area 13a is now in the area between the scraper ring 41 and the die tool 12 and is, for example, on the die tool 12. With the help of the rinsing device 47 becomes the separated edge area 13a via a rinsing fluid F from the ironing device 10 rinsed out.

It is possible that the separated edge area 13a , depending on the material used, breaks apart or tears apart into a plurality of separated edge pieces, for example when the edge region 13a with the help of the stripping device 40 from the drawing punch 11 is stripped off. Such smaller edge pieces are even easier to dispose of. It is essential that the ironing device 10 also works properly if a very viscoelastic material for the production of the hollow body 14 is used and therefore the border area 13a must be disposed of as an annular closed waste part or if this edge area 13a only in one, two or three places in relatively large residual pieces breaks or tears.

In the first embodiment of the ironing device 10 may be the distance between the at least one driver surface 30 and the sales area 25 or between the driving edge 34 and the separating edge 26 be very small. This distance d is in the 1 and 4 located. In particular, this distance d less than the stroke h needed to reach the ground 19 of the hollow body 14 in cooperation with the Domer 20 reshape. It is thereby achieved that by the at least one driver projection 29 and its distance to the separating edge 26 or to the sales area 25 no additional stroke is required.

Additionally or alternatively, the distance d preferably smaller than the dimension of the at least one ironing ring 28 along the longitudinal axis L , The distance d For example, it may be smaller than 10 cm to 15 cm, and is preferably smaller than 15 cm.

In a modification of the first embodiment according to the 1 to 7 can the rinsing device 47 as rinsing fluid F also expel air instead of the coolant. The rinsing device 47 may be referred to in this case as a blow-out. However, it is preferred as rinsing fluid F to use a coolant, which is also used to cool the die tool 12 and / or for lubrication between the hollow body blank 13 and the die tool 12 can serve during forming.

Based on 8th to 11 is another embodiment of the ironing device 10 explained. In this embodiment, an annular driver part 55 is provided, which is formed as a separate part and coaxial with the longitudinal axis L on the drawing punch 11 is arranged. For this purpose, the drawing punch 11 For example, a cylindrical section 56 exhibit, extending from the free end 16 of the drawing punch from considered in Rückhubrichtung R to the first ring heel 24 or according to the example of the annular projection 32 followed. As in 8th illustrated has the second annular shoulder 31 a right angle to the longitudinal axis L aligned surface, which is a support surface 57 for the driver part 55 forms. On the support surface 57 opposite side goes the cylindrical section 56 in the section of the drawing punch 11 with the stamp outer surface 35 over, for example via a convexly curved transition surface 58 , The diameter of the cylindrical section 56 is smaller than the diameter of the annular projection 32 as well as in the return stroke direction R subsequent section of the drawing punch 11 with the stamp outer surface 35 ,

That around the cylindrical section 56 arranged around driver part 55 has a ring part 59 , which is on the support surface 57 is applied. Starting from the ring part 59 extend obliquely to the longitudinal axis L several finger parts distributed over the circumference 60 path. The finger parts 60 are resilient radially to the longitudinal axis L pivotable. That the ring part 59 opposite free end 61 of each finger part 60 has in rest position when not acted upon by a radial force driver part 55 a greater radial distance from the longitudinal axis L as the ring part 59.

At the free end 61 every finger part 60 is the driving surface 30 arranged. The free end 61 each finger part 60 thus provides the driving projection 29 represents.

As in particular in 9 you can see, are the finger parts 60 according to the example in the circumferential direction U spaced from each other. The distance between two adjacent finger parts 60 is the same size.

Incidentally, the structure of the drawing punch corresponds 11 and the ironing device 10 the first embodiment according to the 1 to 7 so that reference may be made to the above description.

The ironing device 10 according to the 8th to 11 works as follows, paying particular attention to the 10 and 11 is referred to the operation of the driver part 55 to explain.

The forming of the hollow body 14 during the working stroke of the drawing punch 11 in working stroke direction A takes place according to the first embodiment. During the working stroke of the drawing punch 11 become the elastic finger parts 60 at least through the ironing ring 28 with the smallest inner diameter resilient in the direction of the longitudinal axis L moved. This is between the finger parts 60 at least in the area of their free ends 61 and the cylindrical section 56 a travel scope available.

After the driver part 55 through the ironing ring 28 With the smallest inner diameter moved, the finger parts feather 60 again radially outward. At least in sections, the driver surfaces 30 a greater radial distance to the longitudinal axis L as the separating edge 26 of the drawing punch 11 , The free ends 61 or the driver surfaces 30 protrude at least partially from the contour of the drawing punch 11 radially out. On the return stroke of the drawing punch 11 in the return stroke direction R reach the driver surfaces 30 and the free ends 61 initially in contact with the ironing ring 28 What is schematic in 11 is illustrated. Here are the free ends 61 the finger parts 60 pivoted radially inward as it is in 11 using the arrow P is shown. In a further return stroke of the drawing punch 11 take the finger parts 60 in the 11 dotted shown position and slide on de inner edge of the ironing ring 28 along. They finally get in touch with the still between the drawing punch 11 and the ironing ring 28 existing separated edge area 13a ( 8th ). This edge area 13a was the same as in the first embodiment during the working stroke of the drawing punch through the separating edge 26 separated. The driving surfaces 61 on the finger parts 60 move the separated edge area 13a from the gap between the drawing punch 11 and the ironing ring 38 out. Subsequently, this separated edge area 13a as in the first embodiment with the aid of the stripping device 40 stiffened and with the help of the rinsing device 47 be rinsed out ( 6 and 7 ).

To move the free ends in 61 the finger parts 60 in the ironing ring 28 To facilitate, the driver surfaces can 60 in relation to the longitudinal axis L in the unbeaten rest position of the driver part 55 in working stroke direction A while running obliquely radially outward. The driving surfaces 30 lie, for example, in a common conical surface whose diameter is in Arbeithemubrichtung A increased.

To the driver part 55 on the cylindrical section 56 order, can the drawing stamp 11 along the longitudinal axis L be executed in two parts and assembled. The driver part 55 can be produced as a stamped and bent part from a metal sheet.

The invention relates to an ironing device 10 for producing a hollow body 14 from a hollow body blank 13 , A drawing punch 11 is along a longitudinal axis L movable and then points to its free end 16 a Umformaußenfläche 15 on. For forming the hollow body blank 13 in the hollow body 14 works the Umformaußenfläche 15 with a die tool 13 together, the at least one coaxial to the longitudinal axis L arranged ironing ring 28 having. Following the external forming surface 15 has the drawing punch 11 a first ring heel 24 on, where its diameter increases, creating a separating edge 26 is formed. On the free end 16 opposite side of the separating edge 26 is on the drawing punch 11 at least one driving edge 29 with a driving surface 30 educated. The driver surface points from the free end 16 away and can be at least partially oblique or rectangular, rectilinear or curved.

LIST OF REFERENCE NUMBERS

10

ironing apparatus

11

drawing punch

12

die tool

13

Parison

13a

border area

14

hollow body

15

Umformaußenfläche

16

free end of the drawing punch

17

face

18

Umformaussparung

19

Bottom of the hollow body

20

Domer

24

first ring heel

25

shoulder surface

26

separating edge

28

ironing ring

29

driver projection

30

entraining

31

second ring heel

32

annular projection

33

Cylinder surface

34

entrainment

35

Stamp outer surface

40

stripping

41

scraper

42

opening

47

flusher

48

Ausspülkanal

49

muzzle

55

driver part

56

cylindrical section

57

supporting

58

Transition surface

59

ring part

60

finger part

61

free end of the finger part

A

Working stroke direction

d

distance

F

Ausspülfluid

L

longitudinal axis

P

arrow

R

Return stroke direction

U

circumferentially

Claims (13)

Ironing device (10) for producing a hollow body (14) with a drawing punch (11) which can be moved along a longitudinal axis (L) and which has a forming outer surface (15) which is arranged coaxially to the longitudinal axis (L), with a die tool (12) which has at least one ironing ring (28) arranged coaxially with the longitudinal axis (L), the drawing punch (11) having a separating edge (26) arranged on a first annular shoulder (24) with a shoulder surface (25) facing the free end (16) of the drawing punch (11), the diameter of the separating edge (26 ) substantially corresponds to the inner diameter of the smallest ironing ring (28), with at least one driving projection (29) arranged on the drawing punch (11) and having a driving face (30) pointing away from the free end (16) of the drawing punch (11), wherein the driving projection (29) is closed annularly and has a driving edge (34) which is arranged on a second annular shoulder (31) of the drawing punch (11), and wherein the diameter of the driving edge (34) substantially to the inner diameter of the smallest ironing ring (34). 28). Ironing device after Claim 1 , characterized in that the first annular shoulder (24) and the second annular shoulder (31) are arranged on a common annular projection (32). Ironing device after Claim 1 , characterized in that a plurality of circumferentially (U) of the drawing punch (11) distributed driving projections (29) are present. Ironing device after Claim 3 , characterized in that the driver projections (29) in the circumferential direction (U) are arranged at a distance from each other. Ironing device according to one of the preceding claims, characterized in that the driver surface (30) is concavely curved. Ironing apparatus according to one of the preceding claims, characterized in that the maximum distance (d) between the at least one driver surface (30) and the separating edge (26) is smaller than the height of the at least one ironing ring (28). Ironing device according to one of the preceding claims, characterized in that the at least one driving projection (29) is integrally formed on the drawing punch (11). Ironing device according to one of Claims 1 to 6 , characterized in that the at least one driver projection (29) on a driver part (55) is arranged, which surrounds the drawing punch (11) annular. Ironing device after Claim 8 , characterized in that the at least one driver surface (30) at a free end (61) of a resilient finger part (60) is arranged. Ironing device after Claim 9 , characterized in that the at least one driver surface (30) in the unloaded resting state of the finger part (60) has a maximum distance to the longitudinal axis (L) which is at least as large as the radius of the ironing ring (28) with the smallest inner diameter. Ironing device according to one of the preceding claims, characterized in that in a return stroke direction (R) of the drawing punch (11) behind the die tool (12) a stripping device (40) for a through the separating edge (26) of the Drawing punch (11) separated edge region (13 a) of the hollow body (14) is arranged. Ironing apparatus according to one of the preceding claims, characterized in that in a return stroke direction (R) of the drawing punch (11) behind the die tool (12) a blow-out and / or rinsing device (47) for blowing or rinsing of the separated edge region (13a) Hollow body (14) is arranged. A method of producing a hollow body (14) using an ironing device (10) having a drawing punch (11) movable along a longitudinal axis (L) and having a forming outer surface (15) coaxial with the longitudinal axis (L) Die tool (12) having at least one co-axial with the longitudinal axis (L) arranged ironing ring (28), wherein the drawing punch (11) has a separating edge (26) on a first annular shoulder (24) with a to the free end ( 16) of the drawing punch (11) facing sales surface (25) is arranged, wherein the diameter of the separating edge (26) substantially corresponds to the inner diameter of the smallest ironing ring (28) of the at least one ironing ring, and at least one of the drawing punch (11) arranged driving projection (29) having a from the free end (16) of the drawing punch (11) facing away driving surface (30), comprising the following steps: - Abstreckgleitziehen a hollow body blank (13) by a die tool (12) during a working stroke of the drawing punch (11) in a Arbeitshubrichtung (A), Separating an annular edge region (13a) from the hollow body blank (13) when the separating edge (26) is moved through the smallest ironing ring (28) during the working stroke of the drawing punch (11), - Taking along and removing the separated annular edge portion (13 a) from the die tool (12) in a return stroke of the drawing punch (11) in a return direction (R).

Images