DE102007061007A1 - Press for manufacturing e.g. vehicle door, has gas-pressurized spring compressed against spring force during driving of spring together with press, where spring comprises delayed extension characteristic - Google Patents

Abstract

The press (1) has a gas-pressurized spring arranged between a press table (2) and a plunger (3) and/or between a lower die (5) of a press tool (4) and an upper die (6) of the press tool. The lower die is fastened to the press table, and the upper die is fastened to the plunger. The spring is compressed against a spring force during driving of the spring together with the press, where the spring has a delayed extension characteristic. The spring is fastened to the lower die and extended into a block retainer (11), where the spring is formed as a delay cylinder.

Description

The Invention relates to a press for the manufacture of vehicle parts, with a press table, on which a tool lower part of a pressing tool is fixed or can be, a press ram, on which a tool upper part of the pressing tool is attached or and at least one between the press table and the press ram and / or between the two Tool parts arranged spring, which when moving the press against spring force is or can be compressed.

at Pressing tools, in particular for multi-workstation tools, Cutting and forming steps usually can not do so be designed that a corresponding force balance of each Work stages is created. For example, one needs Drawing work a greater force than one Pruning or bending work. In these cases it comes to an eccentric force attack on the plunger, whereby a ram tilting is caused, the in turn, an inclination of the tool parts result Has. This also creates an offset between the opposing ones Active parts of the tool, which assigned to the jobs Represent areas of the tool. The tilting or the offset leads in addition to increased press stress also to a premature tool wear.

The DE 102 49 809 A1 discloses a press with at least one press head, at least one press table, at least one plunger movable between press head and press table and at least one device for tilt compensation, which is designed as an adjustable push rod.

From the DD 218 845 A1 a method is known for the subsequent machining of molds from sheet metal by means of a press, whereby a tilting moment resulting from an eccentric force attack is almost canceled out by means of a spacer. The spacer has a maximum distance to the ram center and can be equipped with path-dependent power metering.

Becomes used for Kippmomentkompensation a spring, it follows the problem that when moving apart of the tool parts of up opposing counteracting forces acting at that time that of the active parts or of the interposed workpieces come, almost skipped account, whereas the compressed spring over a longer Goes away and relaxes. Thus exercises the spring during extension over a certain stroke range furthermore a not inconsiderable counterforce on the upper part of the tool or on the press ram, which is a on the Tool upper part or attacking on the press ram Causes tilting moment, but this time in opposite Direction as the tilting moment to be compensated by means of the spring when moving together of the tool parts acts.

outgoing This is the object of the invention, a press of the the aforementioned type such that a through the spring caused tilting moment when moving apart of the press or not only occurs in a weakened form.

These Task is according to the invention with a press solved according to claim 1. Preferred developments are given in the dependent claims.

The press according to the invention for the manufacture of vehicle parts, in particular of body parts, vehicle doors etc., has a press table to which a lower tool part of a pressing tool attached is or can be, a press ram, on a tool upper part of the pressing tool is or are attached can, and at least one between the press table and the press ram and / or between the two tool parts arranged spring on the Collapse of the press compressed against spring force is or may be, the spring having a delayed extension behavior having. The at least one spring is used in particular a tilting moment compensation and / or a compensation of off-center forces.

Becomes When the press spreads, the spring retards off, so the lifting speed of the press ram exceeds the extension speed of the spring. In order to deleted during the moving apart of the press that of the spring on the upper tool or on the press ram applied counterforce early, so the tipping moment does not occur or only briefly at the beginning of moving apart acts and then deleted. The spring thus has a particular delayed against the moving apart of the press Extension behavior on.

The spring is preferably a gas pressure spring, which is designed in particular as a deceleration cylinder. Such a delay cylinder is known from the prior art, wherein according to a realization possibility during the retraction of the piston rod gas flows through an open check valve and to a small extent through a small bore. If the piston rod would like to move back on discharge, closes the check valve or the ball of the Check valve, so that gas can flow only through the small hole. Since the check valve in the open state or during compression releases an opening which is larger in particular than the small bore, the gas spring can be compressed like a conventional gas spring without delay cylinder. A description of such a delay cylinder is z. B. a technical contribution from the technical journal "The Cutting & Punching Tool Construction", 6/2006 (November / December), Fachverlag Möller, pages 132 to 133 , removable.

The Spring may be on the press table or on the press ram be attached. Preferably, however, the spring is on or in one of Tool parts, in particular attached to or in the tool base.

The Press tool has in particular a cleat guide at least one provided on a first of the tool parts Studs and at least one provided on a second of the tool parts Stollen recording on, in the cleats, especially when moving together the press or the tool parts, can dive or dive, wherein the spring is attached to the second tool part and extends at least partially into the cleat receiver. there the lug receptacle is provided in particular on the lower tool part. When moving the press together, the stud with the spring in Contact and compress these. Preferably, the stud guide a provided on the first tool part second lugs and a provided on the second tool part second lugs recording into which the second tunnel, in particular when moving together the press or the tool parts, immersed or can dip. If the pressing tool has one or more work stations, then these are this particular between the two pairings of studs and Stollen recording provided, whereby each of the pairings (Füh mageungen) includes one of the tunnels and the associated tunnels recording, in which of these tunnels can dive or dive.

According to one Further, the pressing tool has one or at least one Job on. For example, the pressing tool is a multi-work tool trained, which includes several jobs.

The Press tool preferably has at least one job Pulling the workpiece (drawing work) on. preferably the pressing tool also comprises at least one workstation for Trimming and / or punching the workpiece (trimming work site). In particular, the pressing tool has four work stations, one first for pulling, a second for trimming, a third for trimming and a fourth for trimming and / or for raising. Because in the rule for the drawing job the largest Force is required, the spring is preferably as possible far away from the drawing workstation. In particular are other or the other jobs between the drawing job and the spring arranged. According to a development is the job, that of the second stud and the second Stollen recording formed leadership pairing the next lies, the drawing workstation.

Between the press table and the press ram and / or between the two tool parts can more, in particular a tilting moment compensation and / or a compensation of off-center Serving forces, springs are arranged when moving together the press are compressed against spring force or can be and delayed retraction exhibit. Several springs are z. B. then desirable if the required counterforce is not applied with a spring alone can be. Furthermore, the forces exerted by the springs Counter forces when pressing the tool parts over the tool depth are distributed. Since it is expensive, the springs specially for a press tool is preferred existing or available on the market springs used. Thus, it can be used to set the desired counterforce be favorable to use different springs. There preferably all springs have a delayed extension behavior, The different springs differ especially in their compression behavior. According to a development Thus, at least two of the springs have a different compression behavior on. This is z. B. thereby realizable that the different Springs have a different cylinder diameter. Furthermore, can the drag can be influenced by the gas pressure, so this preferably can be adjusted in the spring or the springs. In particular, it is possible to network the springs and operate in a common gas network. This can be z. B. by means a tank plate on which the springs are mounted, wherein the tank plate for each of the springs is a gas supply holds, and wherein the gas supplies, z. B. in a manifold, are merged.

The invention further relates to a pressing tool for installation in a press, in particular for the production of vehicle parts, with a tool lower part, an upper tool and at least one arranged between the two tool parts, in particular a tilting torque compensation and / or a compensation of off-center forces serving spring, the collapse the tool parts together against spring force is pressed or can be, wherein the spring has a delayed extension behavior. This pressing tool is in particular the pressing tool described together with the press according to the invention and can be developed according to all embodiments described in this connection. The pressing tool is in particular a multipurpose tool.

Prefers are thus for the invention as a delay cylinder trained gas springs with a delayed extension behavior used to compensate for off-center forces, which arise primarily through the respective drawing operations. In this way, during the pulling process, a force or Torque compensation during the ram without external force to its starting position can go back.

The Invention will be described below with reference to preferred embodiments described with reference to the drawing.

In show the drawing:

1 a partial perspective view of a press according to a first embodiment of the invention,

2 a perspective view of the tool part after 1 .

3 a perspective view of the spring assembly according to 2 .

4 a first variant of the spring arrangement,

5 a second variant of the spring arrangement,

6 a third variant of the spring arrangement,

7 a partial perspective view of a press according to a second embodiment of the invention,

8th another partial view of the second embodiment and

9 a schematic representation of the flow of forces.

Out 1 is a schematic partial view of a press 1 according to a first embodiment of the invention, wherein between a press table 2 and a press ram 3 a pressing tool 4 is arranged, which one with the press table 2 firmly connected tool base 5 and one with the press ram 3 firmly connected tool shell 6 having. The press ram 3 can in the stroke direction 7 high and thus from the press table 2 be driven away. This is also called divergence of the press 1 designated. Furthermore, the press ram 3 in one of the stroke direction 7 opposite working direction 8th against the press table 2 be driven and / or pressed, wherein the pressing tool 4 is interposed. Moving the press ram 3 in the direction of the arrow 8th is also called merging of the press 1 designated.

The pressing tool 4 has a gallery guide 9 with one with the tool shell 6 firmly connected or integrally formed studs 10 and one in the lower tool part 5 provided gallery reception 11 in, according to 1 the tunnel 10 is immersed. On the cleat 10 opposite side of the pressing tool 4 a corresponding arrangement of studs and studs recording is provided. Furthermore, the pressing tool 4 a spring arrangement 23 on that in 1 is indicated only schematically.

Out 2 is a perspective top view of the tool base 5 It can be seen which active parts 12 to 15 each having a workstation 16 to 19 assigned. This forms the job 16 a drawing tool, the workstation 17 a trimming tool, the job 18 a reforming tool and the job 19 a pruning / raising tool, with the workstations 16 to 19 in the pressing tool 4 are integrated. The tool shell 6 also has active parts that correspond to the respective active parts 12 to 15 are assigned and this in the assembled state of the pressing tool 4 opposite, so the active parts 12 to 15 with their respective opposite active parts together the jobs 16 to 19 form.

A schematically illustrated workpiece 20 is first in the job 16 inserted and pulled in a first processing step. After that, the workpiece becomes 20 the job 16 taken and in the workplace 17 inserted and subjected there in a second processing step a cutting process. After that, the workpiece becomes 20 the job 17 taken and in the workplace 18 inserted and reshaped there in a third processing step. After that, the workpiece becomes 20 the job 18 taken and in the workplace 19 inserted and subjected in a fourth processing step a trimming and / or raising. After that, the workpiece becomes 20 the pressing tool 4 taken. The production direction is with the arrow 21 characterized.

Below the gallery 11 are meh rere gas spring 22 in the lower tool part 5 Partially fastened to the cleat 11 protrude and during the pressing process with the studs 10 of the tool shell 6 stay in contact. The gas springs 22 are designed as delay cylinder. As for the machining of the workpiece 20 in the workplace 16 are the aufzu by comparison with the other jobs by far the largest forces are aufzu, are the gas springs 22 in production direction 21 seen in the greatest possible distance to the job 16 arranged.

The feathers 22 form the spring arrangement 23 , in an enlarged view 3 is apparent. Here are the gas springs 22 arranged in two staggered rows, perpendicular to the direction of production 21 and perpendicular to the working direction 8th run.

From the 4 to 6 are for the spring assembly 23 represented several variants, which the spring arrangement 23 to 3 can replace. According to one out 4 apparent first variant of the spring arrangement 23 are the springs 22 arranged in only one row. From 5 apparent second variant of the spring arrangement 23 also shows only a number of springs 22 However, these have a larger diameter than the springs previously shown, so fewer springs are required. According to the 6 apparent third variant of the spring arrangement 23 are finally feathers 22 provided with different diameters combined. The rows in which the feathers 22 are arranged, in particular run perpendicular to the direction of production 21 as well as perpendicular to the working direction 8th ,

Out 7 is a partial perspective view of a press 1 according to a second embodiment of the invention, wherein similar or identical features to the first embodiment are denoted by the same reference numerals as in the first embodiment. In contrast to the first embodiment, the springs 22 at one with the press table 2 connected carrier 24 attached and act in the contracted state of the press 1 with a tight with the press ram 3 connected carrier 25 together. In 8th is another view of dating 7 apparent arrangement shown, wherein the press table 2 and the press ram 3 are not shown. Again, the spring arrangement 23 be replaced by the explained in connection with the first embodiment Federanordnungsvarianten.

Out 9 is a schematic view of a flow of force across the width of the pressing tool 4 in production direction 21 apparent, the job 16 a force F1, the job 17 a force F2, the job 18 a force F3 and the job 19 requires a force F4, which are associated with two arrows because of the steps cropping and raising. Further, the force F5 represents the force required for blank holder balancing pins. F6 denotes that of the springs 22 applied force according to the first embodiment (A) and F7 denotes that of the springs 22 applied force according to the second embodiment (B). Finally, F8 is to be applied by the press or theoretically applied pressing force, in this case, an offset to that with the arrow 26 having marked center of the press or of the pressing tool. The distance of the jobs 16 to 19 from the middle is indicated in mm. Furthermore, the forces are given in kN.

From the given numerical examples it becomes clear that the ones of the springs 22 applied force with the distance of the press ram from bottom dead center (UT) changes.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10249809 A1 [0003]
• - DD 218845 A1 [0004]

Cited non-patent literature

• - "Cutting & Die Tool Making", 6/2006 (November / December), Fachverlag Möller, pages 132 to 133 [0010]

Claims (8)

Press for the production of vehicle parts, with a press table ( 2 ), on which a tool lower part ( 5 ) of a pressing tool ( 4 ) is or can be attached to a press ram ( 3 ), on which a tool shell ( 6 ) of the pressing tool ( 4 ) or at least one between the press table ( 2 ) and the press ram ( 3 ) and / or between the two tool parts ( 5 . 6 ) arranged spring ( 22 ) which, when the press ( 1 ) is or can be compressed against spring force, characterized in that the spring ( 22 ) has a delayed extension behavior. Press according to claim 1, characterized in that the spring ( 22 ) Is designed as a delay cylinder gas pressure spring. Press according to claim 1 or 2, characterized in that the spring on or in the tool lower part ( 5 ) is attached. Press according to one of the preceding claims, characterized in that the pressing tool ( 4 ) a gallery guide ( 9 ) with at least one on a first of the tool parts ( 6 ) ( 10 ) and at least one on a second of the tool parts ( 5 ) ( 11 ) into which the tunnel ( 10 ) can dip or dip, the spring ( 22 ) on the second tool part ( 5 ) is attached and at least partially in the stollen receptacle ( 11 ). Press according to one of the preceding claims, characterized in that the pressing tool ( 4 ) at least one drawing workstation ( 16 ) and at least one trimming workstation ( 17 ) having. Press according to one of the preceding claims, characterized in that between the press table ( 2 ) and the press ram ( 3 ) and / or between the two tool parts ( 5 . 6 ) several springs ( 22 ) are arranged, which when moving the press ( 1 ) can be or are compressed against spring force and have a delayed extension behavior. Press according to claim 6, characterized in that at least two of the springs ( 22 ) have a different diameter and / or a different compression behavior. Pressing tool for installation in a press, with a tool lower part ( 5 ), a tool shell ( 6 ), at least one between the two tool parts ( 5 . 6 ) arranged spring ( 22 ), which when moving the tool parts ( 5 . 6 ) is or can be compressed against spring force, characterized in that the spring ( 22 ) has a delayed extension behavior.