BG67645B1 - Production system of hybrid processing by lathing off and then layering on material by means of electric arc welding - Google Patents

Abstract

The production system for hybrid processing by lathing off and then layering on material by means of electric arc welding includes a lathing centre (1) with a computer numerical control which lathes off chips of material, and a robotized module (2) connected to a power source (7) which is responsible for the layering of additional material by means of electric arc welding, wherein the additional material is in the form of thread. The system also includes an aspiration module (4) which exhausts the gases released during the layering of additional material.

Description

Field of technique

The production system for hybrid processing, integrating a turning center for chip removal and electric arc addition of material from a thread using a robotic module, by combining the two technologies on one work unit, according to the invention, finds application in the field of metalworking in general and specialized mechanical engineering. The system is intended for the processing of parts with medium and complex geometry, and for carrying out repair work on such parts.

Prior art

Similar systems combining removal and material addition processes are known, such as is shown in German patent DE 112016002707T5, in which a laser head and powder material are used for the material addition processes. The disadvantage of this type of material addition technology is the expensive metal powder and the specific requirements for the working chamber.

In the German patent DE 112016002368T5, the combined machining system has two work zones, by chip removal and by material addition, and the transfer of the parts between the two work zones is carried out by means of a robotic manipulator, and the layering of material is carried out by metal powder by means of an integrated laser head. The disadvantage of this type of material addition technology is the expensive metal powder, the specific requirements of the work chamber, and errors from rebasing the part between the two work setups.

In German patent DE 112016001316T5, the hybrid machining system includes a lathe center performing the chip removal and is combined with an external module applying the added metal powder material by means of a laser head. The disadvantage of this type of technology with the addition of material is the expensive metal powder, and the specific requirements for the working chamber.

What the listed patents have in common is the integration of material-adding and material-removing technology into one system that has enclosures and a control system. The removal of material takes place from a turning center, including a cutting tool, a holder for a cutting tool and a main translation composed of a series-connected electric motor, a feed translation and a spindle for rotating a workpiece. The difference is in the combinations of the specific technologies performing the operations.

As a disadvantage of the listed variants of the material addition technology, the use of powdery material can be considered, which makes the production technology more expensive and has specific requirements for the working environment.

None of the machines listed apply material addition technology by electric arc deposition as in the present invention. The hybrid system is distinguished from other similar ones by combining technological operations of material removal by chip removal and material addition by electric arc layering of material from a thread using a robotic module and carrying out both processes on one work unit, without rebasing.

Technical essence of the invention

The task of the present invention is the creation of a production system for hybrid processing, integrating a turning center in chip removal and electric arc addition of thread material using a robotic module. Machining technological processes are widespread and provide a wide choice of processed materials, tools and modes of operation. At the same time, for parts with complex geometry and worn or defective parts, technologies with material addition are very suitable, both for achieving the desired geometry and for carrying out repair activities. The combination of the two types of technology in one hybrid processing system enables the optimization of processes, with the possibility of choosing the appropriate technology according to the specific case. Another advantage of the hybrid system is the combination of the two technologies on one workstation, which minimizes the possibility of rebasing errors and increases the productivity of the entire process.

This task is solved by the creation of a production system for hybrid machining by chip removal and electric arc material addition, according to the invention, which includes a functionally connected turning center with fences and a robotic module with an electric arc material addition system from a thread.

The turning center includes a digital program control, a cutting tool, a cutting tool holder, and a main translation composed of a series-connected electric motor, a feed translation, and a spindle for rotating a workpiece mounted on a workbench. The spindle is a hollow shaft through which workpieces (parts) of different lengths can pass. At one end is a chuck or other device to which the workpiece is clamped for processing. Through its rotation, the rotary motion is transmitted to the workpiece. The cutting tool can be a turning knife or a milling cutter. The digital program control is adapted to provide a signal for positional rotation or positional fixation of the spindle, depending on the operation to be performed turning, milling or arcing. The turning center is designed for processing rotationally symmetrical parts, by turning or performing milling operations, using tools rotating around their axis. In the turning process, the rotary movement is performed by the workpiece driven by the machine spindle, and in the milling process, the rotation of the spindle performs a positioning rotation of the workpiece.

The enclosures have an opening or opening door for the robotic assembly's labor to access to add material to the workpiece.

Additive operations are performed with a robotic module controlled by a control system and connected to an arc current source to melt additive material in filament form. To achieve the process of layering of material, a rotating current is applied through the rotating spindle of the lathe from an electric arc current source. Rotating power supply is necessary to supply voltage between rotating parts. If the current is supplied with a cable, it will twist and break, therefore standard components are used, where this current supply is carried out with the help of brushes. The robotic material addition module requires perpendicular application over a horizontal workpiece layering zone. This layering zone must always be on the upper side of the workpiece, so that the molten material does not flow during the arc addition. Accordingly, for the addition of thread material, the synchronized lathe center control system and the robotic module ensure that the layering zone is always horizontal and the application is perpendicular or near perpendicular to it from the top side. This is done by performing a positioning rotation from the spindle of the lathe center.

Accordingly, the technological process of removal and addition of material is carried out on one working installation, in which the errors of rebasing are eliminated.

The production system for hybrid processing also includes an aspiration system for removing from the fences the released gases from the technological process of material layering.

The lathe center may also include a tailstock for centering long workpieces, which may have a corresponding chuck to hold the workpiece. The back saddle can also be used for higher functionality, allowing the workpiece to be clamped and a wider range of machining operations to be carried out.

The system can be surrounded by a security fence to control access to it.

Explanation of the attached figures

Figure 1 shows an exemplary embodiment of the hybrid machining manufacturing system integrating a machining center and arcing of filament material using a robotic module, according to the invention, showing an enlarged view of the part where the arcing is performed of material.

Figure 2 shows an exemplary embodiment from another angle of the hybrid machining production system integrating a lathe center for chip removal and arcing of filament material using a robotic module, according to the invention.

Figure 3 is a fragmentary view of an exemplary embodiment of the hybrid machining manufacturing system integrating a lathe center for chip removal and wire arcing using a robotic module, according to the invention, showing the system in the process of arcing material, wherein the layering zone is always horizontal, and the application is carried out perpendicular or close to perpendicular to it on the upper side.

Exemplary embodiment of the invention

The device of a production system for hybrid processing, integrating a turning center for chip removal and electric arc addition of thread material with the help of a robotic module, according to a preferred variant of the invention, consists of a turning center 1, which, through its spindle 8, rotates the workpiece 9. The chip removal of material is carried out, by turning or milling depending on the technological process of processing by a tool located in the holder 6 for a cutting tool. The operations of adding material are carried out with a robotic module 2 controlled by a control system 5 working in synchronization with the digital program control of the turning center 1, which robotic module 2 with the help of an electric arc current source 7 applies the additional material in the form of a thread 10 on the processed workpiece 9. In order to achieve the material layering process, through the rotating spindle 8 of the turning center 1, a rotating current supply is carried out from the electric arc current source 7. To remove the released gases from the material layering technological process to the fences 3 of the system aspiration extraction from aspiration system 4 is provided.

The reference numbers of the technical features are included in the claims solely for the purpose of increasing the comprehensibility of the claims and, therefore, these reference numbers do not have any limiting effect on the interpretation of the elements indicated by these reference numbers.

Claims (3)

1. A production system for hybrid machining by material removal and electric arc material addition, comprising a functionally connected turning center (1) with fences (3) and a robotic module (2) for adding material, the turning center (1) including digital program control, a cutting tool, a holder (6) for a cutting tool and a main translation composed of a series-connected electric motor, a feed translation and a spindle (8) for rotating a workpiece (9), mounted on a working installation, characterized in that the fences (3) have a manpower access opening of the robotic module (2) to the spindle (8), and in that the robotic module (2) is equipped with a system for electric arc addition of filament material, and is connected to its own control system ( 5) and with an electric arc source (7), and the electric arc source is connected with the possibility of rotating current feeding with the main translation, in which the production system for hybrid processing also includes an aspiration system (4) for removing separated gases from the enclosures (3). 2. Production system for hybrid processing by chip removal and electric arc material addition according to claim 1, characterized in that the digital program control is connected with the possibility of providing a signal for positioning rotation or for positioning fixation of the spindle (8). 3. Production system for hybrid machining by chip removal and electric arc material addition according to claim 1, characterized in that the robotic module (2) is connected to the possibility of perpendicularly applying material from the thread (10) to an upwardly facing horizontal layering zone of the workpiece.