DD300002A7 - METHOD FOR AUTOMATED CUTTING IN THERMAL SEPARATION - Google Patents

Abstract

The invention relates to a method for automated cutting during thermal cutting at Werkstueckauszenkante with not clearly defined shape and / or position. The aim is to make the thermal separation of components more effective. The task is to secure the cutting edge technologically and to reduce previous expenses. It is characteristic that the cutting torch approaches a predetermined first position lying on the intended cutting line of the workpiece contour, here the cutting process is initiated, the cutting process continues on the intended cutting line in the direction of the workpiece outer edge and interrupted at a second position, which is certainly outside the workpiece outer edge and thereafter the cutting process is continued from the first position in the opposite direction. Figure {thermal separation; Flame cutting; Plasma cutting; Laser cutting; broach; Automation; Werkstueckauszenkante; Workpiece}

Description

The invention has for its object to develop a method by which the automatis.θ cutting during thermal cutting on Werkstückaußenkanton with not clearly defined shape and / or location in particular by means of numerically controlled cutting devices for the regeneration of worn workpiece areas on dredge buckets technologically g be assured reducing previous expenditures on energy or control technology. The object is achieved in that the cutting torch is set to a predetermined on the intended cutting line with certainty within the workpiece contour first position that at this first position of the cutting process is initiated and the Schnek'prozeß on the intended cutting line in the direction of the workpiece outer edge is continued and at a second position, which is located safely outside the workpiece outer edge, is interrupted, then that the burner is set back to the first position and from here further dar further cutting process is continued in the opposite direction.

The advantage of the invention is that even areas of components with extreme deviation of the position of the workpiece outer edge of the target position or with strong rounding on the workpiece outer edge, which usually prevents the gate during fuel and plasma cutting, without additional sensors for the radio, can be easily separated at the distance between the burner axis and the workpiece and without additional other personnel, equipment or energy expense. It is additionally advantageous that from the automatic interruption of the burning or plasma cutting process to the or the workpiece outer edge Korektursignale for the Robotersteuerungsprogram> η can be obtained. The determination according to the invention of the position to be approached first within the workpiece contour, lying a maximum of 50 mm from the outer edge of the workpiece, ensures that after the cutting has taken place, ie. Piercing through the workpiece wall and subsequent cut beyond the workpiece outer edge out when returning the burner on the same cutting line of the cutting process at the first position automatically and continuously reinstates, unaffected by slag accumulations and the puncture in the workpiece wall. The special influence of the position of the first position, maximum 50mm of the workpiece outer edge, on the stability of the cutting process, d. H. the further cutting after returning the burner, is seen in the simultaneous Zeitbegrenzung and cooling of a defined minimum residual heat in both the piercing forth resting slag and in the workpiece wall at this first position, the continuous further cutting on the same cutting line without intermediate preheating, Schlackebese! or other interruptions or changes in cutting parameters.

embodiment

The invention will be explained in more detail using an exemplary embodiment. The accompanying drawing shows schematically an arrangement for carrying out the method according to the invention.

With the cutting torch 1, the workpiece contour 2 is to be separated along the intended cutting line 3, wherein the workpiece partially shown in the picture is a partially verschlissoner by the practical use and deformed bucket. By the section along the section line 3, the front part of the Werkstürkkontur 2, d. H. the bucket knives to be separated, with a regeneration of the bucket, is subsequently realized in such a way that instead of the cut worn bucket knife a new bucket knife is welded back to the remaining workpiece contour. The cutting torch 1 is first set at a predetermined on the cutting line 3 with certainty within the workpiece contour lying first position 4, wherein the o. Safety is ensured by the fact that the distance between the lower workpiece outer edge 5 of a non-deformed excavator bucket and the first position 4 is predetermined to 50mm and known from experience that the deformation or wear of this lower workpiece outer edge 5 does not exceed the value of ± 45mm , At the first position 4, the gate is initiated by piercing through the workpiece wall with approximately perpendicular to the workpiece contour 2 standing cutting torch 1. From the puncture point at the first position 4, the cut on the intended cutting line 3 in the direction 6 of the workpiece outer edge 5 is then continued. At a second position 7, which is certainly outside the tine cutter edge, which in the present case is 50 mm from the outer edge of an undeformed bucket, the cutting process is interrupted by shutting off the cutting gases and the cutting motion. Thereafter, the cutting torch is returned with interim reclosing of the cutting gases to the first position 4 and continued under continuous continuation from here from the further cutting process in the direction 8 to the other workpiece outer edge 9.

Considered printers:

Bprnard / Schreiber: Techniques of the Autogentechnik, reference book series no. 61, DVS Düssedorf 1973, p. 109

Claims (1)

Method for automated cutting during thermal cutting on workpiece outer edges with a not clearly defined shape and / or position, in particular by means of numerically controlled cutting devices, for regenerating worn workpiece areas on dredge buckets, characterized in that the cutting torch (1) has a predetermined cutting line ( 3) within the workpiece contour (2) lying first position (4) anfährt, the maximum 50 mm from the workpiece outer edge (5), which is introduced at this first position (4) of the cutting process and the cutting process on the intended cutting line (3) is continued in the direction of the workpiece outer edge (5) and at a second position (7), which lies outside the workpiece outer edge (5) with certainty, that after that the cutting torch again at the first position (4) set up and from here the another cutting process in the opposite direction on the front seen cutting line (3) is continued. For this 1 page drawing Field of application of the invention The invention relates to a method for automated cutting during thermal cutting on workpiece outer edges with not clearly defined shape and / or position. Characteristic of the known state of the art It is known that in automated firing, plasma or laser cutting of shaped parts made of metal sheets, the cutting path of the burner in the form of a blank plan or sheet metal plan is preprogrammed. The sheet to be cut is then also aligned with the sheet metal support under the cutting machine in a defined position. The cutting process is initiated from a predetermined point within the sheet surface, on the one hand to have the assurance that the remaining around the cut workpieces contiguous sheet metal edge obstructs the thermal deformation of the components in the sheet metal plan and thus increases the accuracy and on the other hand on additional sensors, the looking for the sheet outer edge millimeter accurate, to be able to do without. However, one is forced to a sheet or other workpiece from his Außenkar. - To cut her, so additional technical or personnel expense must be driven to adjust the burner accurately and in technologically required distance at the outermost point of the workpiece outer edge. This is particularly cumbersome or problematic when you want to cut simultaneously with a plurality of burners on a non-uniform sheet edge, such. when cutting sheet metal strips or when the workpiece outer edge unevenly rounded, opposite to the burner chamfered d. H. has a not clearly defined shape and / or the workpiece outer edge is not in the same plane as the general remaining workpiece surface and / or if the workpiece outer edge has an ambiguous position, for. B. infoige of tolerances in the setup of the workpiece to be cut or as a result of uneven wear conditions on a workpiece to be regenerated by cutting. It is also known that for cutting on prefabricated workpieces cutting robot can be used with multiple axes of movement of the burner, webei in particular the separation of riser systems of castings and the regeneration of partially worn workpieces has increasing importance. The latter is interesting z. As in the separation of worn knife areas of dredge buckets lignite industry, where instead of the separated worn knife new blades are welded again. When using the dredge bucket in large bucket chain dredgers, however, not only the knife is worn. There are also deformations of the entire bucket shape. If you want on such a bucket ζ. B. cut off the blade area, the workpiece outer edge is not clearly defined in shape and location and the necessary bleed on the workpiece outer edge is not possible with a given robot control program. The experts have oriented as a solution for cutting and / or welding on tolsranzbehafteten workpieces on the application of additional sensors that operate on electrical, mechanical, optical, pneumatic, acoustic or other combined basis. In this case, for the thermal separation mainly such methods and devices have been developed with which nozzle spacing, d. H. the axial distance between burner nozzle and workpiece, can be sensed. The Sonsieren of the radial distance between the burner axis and the workpiece outer edge, however, has not been satisfactorily resolved and therefore has not been able to gain greater practical importance, for this purpose additional facilities are required. To make the cutting on workpiece outer edges more productive, z. B. to DD-PS 154 204 also proposed to arrange an additional burner or additional nozzles to enter at another location of the workpiece outer edge on the future cutting line thermal energy and to produce a melt flow and initiate the actual cutting process of this melt flow. The disadvantage here is the additional high energy consumption. Object of the invention It is an object of the invention to make the thermal separation of components more effective.