Method for operating at least one machining apparatus and machining system

Abstract

The invention relates to a method for operating at least one machining apparatus as well as a machining system with at least one machining apparatus. Such a machining apparatus can be a machining apparatus for machining workpieces, in particular panel-shaped workpieces, which are used, for example, in the furniture and component industry.

Claims

1. A method for operating at least one machining apparatus, the method comprising: machining a workpiece with a plurality of machining units such that the workpiece has a profile; determining an actual profile geometry of the machined workpiece; comparing the actual profile geometry to a target profile geometry; and if a deviation of the actual profile geometry over the target profile geometry is determined, determining partial corrective values individually for two or more of the plurality of machining units; and outputting the partial corrective values for two or more of the plurality of machining units, wherein the two or more of the plurality of machine units are each adjusted individually based on respective partial corrective values, to collectively contribute in attaining a desired machining result.

2. The method according to claim 1, wherein the actual profile geometry and the target profile geometry comprise at least one length and at least one angle of the profile.

3. The method according to claim 1, wherein the at least adjustment of the two or more of the plurality of machine units based on respective partial corrective values causes a displacement movement of the two or more of the plurality of machine units in at least one translational direction and at least one rotational direction.

4. The method according to claim 1, wherein the method is carried out during a manufacturing process or the method is carried out during a set-up process.

5. The method according to claim 1, wherein the determination of the actual profile geometry is undertaken by means of at least one contactless measuring apparatus, the determination of the actual profile geometry being carried out by means of an impinging light method or transmitted light method from one side of the profile.

6. The method according to claim 1, wherein the determination of the actual profile geometry is carried out by means of a measuring apparatus comprising one or a plurality of contact sensors.

7. The method according to claim 1, wherein after outputting the partial corrective values, at least one further workpiece is machined, and the step of determining an actual profile geometry and the step of comparing the actual profile geometry to a target profile geometry are repeated.

8. The method according to claim 1, wherein the machining of the workpiece comprises a machining process.

9. The method according to claim 1, wherein a plurality of machining apparatus of a machining system are operated with the method.

10. The method according to claim 4, wherein the method is carried out sporadically, cyclically or continuously.

11. The method according to claim 5, wherein the at least one contactless measuring apparatus comprises a camera, a laser, an ultrasonic measuring apparatus, or a combination thereof.

12. The method according to claim 8, wherein the machining process comprises a milling process, a drilling process, a grinding process, or a combination thereof.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic view of a machining system with a plurality of machining apparatus.

(2) FIG. 2a shows a measuring method which can be used in the method according to the invention or the machining system according to the invention.

(3) FIG. 2b shows an alternative measuring method which can be used in the method according to the invention or the machining system according to the invention.

(4) FIG. 3 shows a process sequence to illustrate the method according to the invention and the machining system according to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

(5) On the basis of the enclosed figures, the invention will be described more clearly below, with the subsequent explanations not to be viewed as being restrictive.

(6) Features which are shown in connection with the following description can be used in the method according to the invention as well as the machining system according to the invention. Modifications of such features can be combined each with other features of the described embodiment to form further embodiments of the present invention.

(7) Using a schematic drawing, a machining system 1 is shown in FIG. 1. The machining system 1 comprises a first machining apparatus 10 as well as a second machining apparatus 10′. In the conveying direction of a workpiece, the first machining apparatus 10 is arranged subsequent to the second machining unit 10′. A workpiece can be transferred manually or mechanically from one machining apparatus to another.

(8) Further machining apparatus can be provided in the machining system 1. Only the first machining apparatus 10 will be described in detail below in order to clearly describe the invention. Similar or other details can be provided in the second machining apparatus 10′ or in a further machining apparatus.

(9) The first machining apparatus 10 comprises a machine bed 11 which extends along the conveying direction. To move the workpieces in the conveying direction, a conveying apparatus 12 is provided in the present embodiment example, which is configured, for example, as a chain belt conveyor or belt conveyor.

(10) A plurality of machining units 13, 13′, 13″ are arranged along the conveying path of the first machining apparatus, which can carry out various machining processes on a workpiece moved by the conveying apparatus 12. In particular, in several steps recesses are made, inter alia, on a narrow side of a workpiece W to form a profile on workpiece W. A workpiece machined in such a manner can be, for example, a parquet panel with a click profile or a similar profile.

(11) The first machining apparatus 10 further comprises a tool changer 14 which is configured as a robot in the present embodiment example. The tool changer 14 can change a tool on one or a plurality of machining units 13, 13′, 13″.

(12) A measuring apparatus 30 that will be subsequently explained in more detail is provided in an outlet region of the machining apparatus 10. An actual profile geometry of a machined workpiece is detected by the measuring apparatus 30.

(13) The machining system 1 further comprises a control apparatus 15. A main control 20 is moreover provided, which communicates with the control apparatus 15. The communication between the control apparatus 15, the control 20 and/or units of the machining apparatus 10 can take place wirelessly or via cable.

(14) Data relating to the machining units or tools used in the first machining apparatus 10 are determined by the control apparatus 15 or these data are input manually. Moreover, the data relating to the workpiece geometry of a workpiece to be machined are determined or input manually.

(15) These data are transferred to the main control 20 (D1). The main control 20 communicates with the measuring apparatus 30. The measuring apparatus 30 determines an actual profile geometry of a machined workpiece which was, for example, machined as a test workpiece during a set-up process. Alternatively, it can also be a workpiece which will have to be evaluated during a manufacturing process of the machining apparatus 10.

(16) The main control 20 compares the present values of the target profile geometry with the actual profile geometry determined by the measuring apparatus 30. If a deviation is ascertained, the respective data are transmitted to the control apparatus 15.

(17) The control apparatus 15 determines measures for controlling the machining units or, optionally, a tool changer from the data received (D2). In this regard, the described control options are to be understood as examples.

(18) In particular, a width change at the feeding ruler can be influenced (D3). Furthermore, it can be communicated to the tool changer 14 that there is a defect tool at a particular machining unit and that this tool is to be replaced (D4). The control apparatus 15 can also cause the machining units 13, 13′, 13″ to be affected to change the position thereof in a translational and/or rotational direction. Each of the machining units 13, 13′, 13″ can comprise different axes which can be affected. Four-axis, five-axis and six-axis units must be mentioned in particular, which can be combined in the first machining apparatus 10.

(19) In FIG. 2a, an example of a measuring apparatus 30 is shown, which carries out an optical determination of a profile geometry of a workpiece. A measuring sensor 31 is used which comprises a laser and a camera in order to scan the profile of a workpiece and accordingly determine profile geometry data.

(20) In FIG. 2b, an alternative embodiment of a measuring apparatus 30′ is shown, which comprises a plurality of contact sensors 31′, 32′ (tactile sensors). The contact sensors 31′, 32′ come into contact with specific portions of the profile of the workpiece W′ and determine profile data.

(21) According to a further embodiment, a contactless measuring sensor and a contact sensor can be combined in a measuring apparatus to determine a profile geometry of a workpiece.

(22) In FIG. 3, an example of a process sequence is shown, with the process in the present embodiment example consisting of a portion for determining a profile geometry when setting-up the machining apparatus 10 and a portion for determining a profile geometry during an ongoing manufacturing process as part of quality monitoring. Said procedural steps can also be applied individually.

(23) First, the machining apparatus 10 is set-up (step S1). In this regard, the machining units 13, 13′, 13″ are equipped, for example, with specific tools and the machining units are adjusted for machining. This adjustment of the machining units can relate, for example, to basic positions of the machining units.

(24) A test workpiece is thereafter manufactured with a machining apparatus prepared in such a manner (step S2).

(25) The workpiece manufactured such is now evaluated by the measuring apparatus (30 or 30′) and the actual profile geometry of the workpiece is determined during this.

(26) The main control 20 decides in a subsequent method step (step S4) whether the workpiece was manufactured without errors. This means that the determined actual profile geometry lies within a tolerance range in relation to the target profile geometry.

(27) If it is determined in step S4 that the actual profile geometry is within the tolerance range of the target profile geometry (YES in step S4), the conventional manufacturing process (the mass production) can be started (step S5).

(28) However, if it is determined in step S4 that the actual profile geometry deviates from the target profile geometry beyond the fixed tolerance range (NO in step S4), an error correction is undertaken (step S6). A test workpiece is again manufactured thereafter (step S2).

(29) If, as described previously, the mass production is started (step S5), a workpiece can be measured (step S7) during the mass production in order to determine the respective actual profile geometry.

(30) The main control 20 decides on the basis of the measuring results of the measuring apparatus 30, 30′ whether the workpiece was manufactured within the tolerance range (step S8). If this is not the case (NO in step S8), an error correction is undertaken with step S6. This can furthermore require that a test workpiece must be manufactured again (step S2).

(31) However, if it is determined in step S8 that the workpiece was manufactured such that the actual profile geometry is within a tolerance range of the target profile geometry (YES in step S8), mass production is continued.