DE102009024262A1 - Method for bending elongated workpieces - Google Patents

Abstract

In a method for bending elongated workpieces, in particular of hollow profiles, rods or tubes, by means of a bending device, whose operation is controlled by a control device, is intended with the steps: - Reading a form specification for the workpiece by the control device, and - Generating a command data set for the bending device as a function of the shape specification, the command data set comprising commands for the bending device.

Description

The The present invention relates to a method of bending elongate ones Workpieces, in particular of hollow profiles, rods or pipes, by means of a Bending device whose operation of a control device is controlled.

State of the art

The Bending of oblong Workpieces, especially pipes is still relatively expensive. Although already individual Steps are automated, is always a manual intervention an operator necessary. Particularly tricky points are the Entering the nominal pipe geometry, entering the dimensions of the Blank, the creation of the bending program, the calculation of the bending forces and the selection of suitable bending tools.

Also very expensive and error prone is the implementation a quality control and incorporating the results of this quality control as correction values in the manufacturing process, for example, in a series production.

task

task The present invention is a method for bending elongated workpieces to provide by means of a bending device, the said disadvantages eliminated and with a bending process as quickly and inexpensively, before everything can be done with little setup and programming.

Solution of the task

• – Einlesen einer Formvorgabe für das Werkstück,
• – Generieren eines Befehlsdatensatzes für die Biegeeinrichtung in Abhängigkeit von der Formvorgabe, wobei der Befehlsdatensatz Befehle für die Biegeeinrichtung umfasst.

To solve the problem leads a method with the steps:

• Reading a shape specification for the workpiece,
• Generating a command data set for the bending device as a function of the shape specification, wherein the command data set comprises commands for the bending device.

The Verb "control" is in used in the present application in terms of rules or taxes.

at the inventive Method is conveniently in a first process step, a shape specification for the workpiece to the Transmitted control device. In this case, this control device od as a PC, control od. Like. be educated. There are different methods for reading in the form specification such as the input via a graphical editor, the input of XYZ coordinates, the input LRW values (length, Rotation, angle), the import of XYZ or LRW files. Moreover can also CNC bending programs of other bending machines are imported and in the control facility, this results in a retroactive accounting to the desired Tube geometry. It is also possible for geometry detection a sample to measure at an external or internal measuring station. The measurement results will be then fed to the control device. Next can form specifications also by means of a weld representation, representations of Sonderend- or spacers, Drawings or a 3D expression to a bending angle evaluation without measuring station, to the control device.

Parallel or subsequently receives the control device preferably at least one information Material properties of the workpiece, such as modulus of elasticity, yield strength, Solidification behavior, density, temperature, expansion coefficient, Weight and / or information the bending device, such as maximum bending forces and the size of the workspace. This information relates to the control device preferably from a database associated with the control device is. This information can also manually over an input device of the control device to be notified. Also, the reading of information from external offers Files.

Preferably is read in based on the target geometry, possibly with inclusion one or more of the o. g. Information from the control device Determines whether the imported form specification is bendable at all. Should a workpiece not be bendable according to the shape specification, the process stops and / or A message is issued to an operator or a new one Form specification requested.

proves the workpiece as bendable according to the shape specification, is conveniently for a connected Bending a simulation of the bending process or preferably a collision review performed. In this simulation, in addition to the o. g. Information even more information, for example. About the Bending device, such as maximum bending force or the dimension of the Processing room, be included. To the control device is preferably not only a bending device, but several Bending devices connected. Therefore, the above described Simulation and collision viewing preferably for all of Control device associated bending devices carried out. From the considered bending devices then becomes a specific bending device selected. For this purpose, the control body can use different criteria, such as the calculated processing time, the machine hourly rate or orient the energy or auxiliary consumption.

The certain bending device is driven with the command data set.

Of the certain bending device are preferably assigned bending tools. Examples of different Bending tools, by default to choose from, are finger bender, fork bender, roll bender.

Next the selection of bending tools, the standard assigned to the bending device are, can also expediently Special tools that are first made or at least edited Need to become, selected become. These processing measures or drawings or CAD files for making the special tools are preferably of the Control device generated.

To the decision for a bending device or the appropriate bending tools is from the control device a command data set, preferably a bending program, For example, a CNC program for the selected one Bender created. In addition to important data, such as bending forces and Rebound values The control device for CNC program generation can also have more information about the workpiece, like Young's modulus, yield strength, hardening behavior, density, coefficient of thermal expansion, Dimension, diameter, weight, and / or at least one of the following Machine data of the bending device such as maximum bending force, size of the Machining space or number of axes from the affiliated Remove database. The idea of the invention also includes that the bending program can be imported from an external file. When Biegeprogrammerstellung is included in the inventive concept be that for different machine types, especially Rosenberger automatically a CNC program is created. The control device can be in Be able to bend programs, in the programming languages for different Machine types and controllers to translate.

Subsequently is the control device expediently a set-up plan eg. for the Setters off. This may include cycle times, bending tools, etc. It can also be the already mentioned and described edition of data for processing or manufacturing special tools in the output of the setup plan to get integrated. Here, the set-up plan in paper or on an output device, for example, a desktop can be displayed.

Corresponding the setup plan the bending device is equipped with the required bending tools, the Bending program is running off and the workpiece is bent according to the form specification.

Preferably becomes the finished bent workpiece a quality control subjected. For this, the geometry can be measured. this happens preferably on a 3D measuring station or measuring station, in the bending device is integrated. Also included within the spirit of the invention is a measurement hardware, consisting of a measuring arm or a 3D measuring fork, the direct connected to the machine control. That has the advantage, that the desired geometry is already known and no samples are read Need to become.

If the results of the quality control do not or not sufficiently agree with the shape specification or the desired geometry, correction values are preferably determined which, if it is a series production, ie a repetition of the bending process, enter directly into the bending program production via the control device. It is also possible to store these correction values in the database, or to improve the information in the database by means of the correction values. The next workpiece for this shape specification is then made including the correction values. This real-value recirculation for continuous improvement of the bending process is especially important for the values of springback, bending forces and deformation. Of course, it is also encompassed by the idea of the invention to carry out a manual program correction on the basis of the correction values. In addition, if the quality control is not performed directly in the bending device, the correction values can be obtained from a file attached to the external measuring device space is created to be imported.

figure description

Further Advantages, features and details of the invention will become apparent the following description of preferred embodiments and by reference the drawing; this shows in

1 a schematic representation of an apparatus for carrying out a method according to the invention;

2 a schematic sequence of a method according to the invention.

According to 1 a device for carrying out a method according to the invention has an insertion station 1 for transmitting the desired pipe geometry to a control device 2 on. In addition, the control device 2 additional data or information via an input device 3 and or a database 4 be supplied.

Furthermore, the control device 2 with four bending devices 5.1 to 5.4 connected. In this case, this connection is designed so that the control device 2 Information, commands and / or datasets to the flexures 5.1 to 5.4 can send and also information from these bending devices 5.1 to 5.4 can receive.

As a further element, the device V contains a quality control 6 , This is the bending devices 5.1 to 5.4 assigned. Also can quality control 6 direct information to the control device 2 send or act on these, possibly by means of correction values. In addition, there is a mutual exchange of information between quality control 6 and database 4 possible.

The operation of the present invention is as follows:
2 shows a schematic flow of a method because by means of the device V out 1 can be executed. This is done in one step 7 a desired tube geometry by means of the read station 1 the device V read.

In a subsequent process step 8th become the control device 2 , preferably via the input device 3 or by resorting to the database 4 , Material properties of a workpiece transmitted.

In one process step 9 the controller decides 2 , whether in the process step 7 read target pipe geometry is bendable at all or whether collisions, z. Eg due to high springback values, can occur in the workpiece itself. For non-bendable pipe geometries, a corresponding message appears 17 output.

If the read target pipe geometry is considered to be bendable, takes place in a process step 10 a machine selection. This is done for each of the bending device 5.1 to 5.4 a simulation 10.1 carried out. For this process step 10.1 become the control device 2 Information about bending forces, springback values, different tools or tool heads supplied. Based on the simulation in the process step 10.1 is in the process step 10.2 a collision review performed. These steps are for all bending devices 5.1 , to 5.4 carried out.

According to the results for the process steps 10.1 and 10.2 when considering the different bending devices 5.1 to 5.4 the optimal machine, also selected with regard to economic criteria such as machine hourly rate and cycle time.

For in the process step 10 selected bending device 5.4 is in a process step 11 a CNC program for bending the nominal pipe geometry, according to the simulation 10.1 , created. Subsequently, in a process step 12 a setup plan, which can also serve for the setter created. Based on the CNC program from process step 11 and the Rüstplanerstellung from process step 12 is in a process step 13 the workpiece is bent.

At the finished bent workpiece is in one step 14 the quality control 6 carried out. According to a result of a decision 15 takes place with sufficient agreement with the Target pipe geometry, the machining of a new blank according to the process step 13 , Vote the results of quality control 6 not or not sufficiently consistent with the desired pipe geometry are in one step 16 Correction values determined. These are in the database 4 stored and go as correction values in the process step 11 into CNC programming. LIST OF REFERENCE NUMBERS 1 read-in 2 control device 3 input device 4 Database 5 bender 6 quality control 7 step 8th step 9 step 10 step 11 step 12 step 13 step 14 step 15 step 16 step 17 report V contraption

Claims (15)

Method for bending elongate workpieces, in particular hollow sections, rods or tubes, by means of a bending device, whose operation is controlled by a control device will, with the steps: - read in a formal requirement for the workpiece - To generate a command data record for the bending device in dependence from the form default, wherein the command data set commands for the bending device includes. Method according to claim 1, characterized in that that the command data set is suitable, the bending device so to control that tool at least partially substantially is bent according to the shape specification. Method according to one of claims 1 or 2, characterized that information about the workpiece and / or over the bender is obtained from a database and the command data set Inclusion of information is generated. Method according to claim 3, characterized that the information is at least one of the following material properties of the workpiece Concerns: modulus of elasticity, yield strength, hardening behavior, density, coefficient of thermal expansion, Dimension, diameter, weight, and / or at least one of the following Machine data of the bending device concerns: maximum bending force, Size of the machining area or number of axes. Method according to one of claims 3 to 4, characterized on the basis of the information, a manufacturing process for the workpiece on the bending devices simulated and / or a collision view is performed. A method according to claim 5, characterized in that information for at least two different dene bending devices are referred to and for the various bending machines each a simulation and / or collision inspection is performed. Method according to at least one of claims 6 and 7, characterized in that according to at least one of the criteria: Processing time, collision freedom, energy or auxiliary consumption a particular bending device of the various bending devices selected becomes. Method according to at least one of the preceding claims 1 to 7, characterized in that depending on the simulation and / or the collision consideration of the manufacturing process of the particular Bending device associated bending tools and / or special bending tools become. Method according to at least one of claims 1 to 8, characterized in that the command data set for the particular Bending device is generated. Method according to claim 9, characterized in that that the particular bender is driven with the command data set becomes. Method according to claim 10, characterized in that that the bent workpiece a quality control is subjected. Method according to claim 13, characterized in that that from the results of quality control correction values which are stored in the database and / or as correction values for the Command data set to be used. Computer program product with program code for executing a Computer program on a computer, characterized in that in the execution of the program code, a method according to one of claims 1 to 13 executed becomes. Control facility set up a procedure according to the claims 1 to 13 perform. Apparatus for bending elongated workpieces, comprising a control device according to claim 14 and at least one bending device.