Flexible Arc Electrode Sweeping Laser and Electrochemical Hybrid Machining Device and Method

Abstract

The present invention discloses a flexible arc electrode sweeping laser and electrolysis composite machining device and method, which relates to the field of composite machining in the field of special machining. In the present invention, the electrolyte flowing inside the flexible arc electrode conducts the laser beam, and the thin electrolyte streams are ejected from the side group hole structure of the flexible arc electrode to form water-guided laser to reach the workpiece surface, and the machining is assisted by air flow injection to realize the high-efficiency composite machining of laser electrochemistry. The strong thin electrolyte streams have an impact on the machining products, the electrolyte flushes the workpiece surface and takes away the machining products and heat; the air flow forms a protection for the machined surface and cleans the machined surface at the same time; the laser quickly removes the oxide layer that hinders the electrochemical reaction during the machining process. The present invention can realize the sweeping machining of deep groove structures, effectively increases the scanning machining coverage area of the tool electrode, and thus significantly improves the machining efficiency.

Description

Technical Field

[0001] The present invention relates to the field of composite processing in the field of special processing technology, and in particular to a flexible arc electrode sweeping laser and electrolysis composite processing device and method. Background Art

[0002] High-speed and high-quality processing of deep groove structures is particularly important in the manufacturing of key parts in military fields such as aerospace and navigation, automotive mold preparation, and microelectronics manufacturing.

[0003] Some scholars have tried to use special processing methods (such as laser processing, electrospark processing and electrolytic jet processing, etc.) to efficiently process deep groove structures, but a single processing method has limitations. For example, laser processing and electrospark processing mainly remove materials through heat energy, and the surface of the workpiece after processing usually has processing defects such as recast layer, heat-affected zone, and microcracks, which have an adverse effect on the comprehensive performance of the parts. The surface after electrochemical jet processing has no processing defects such as recast layer, heat-affected zone, and microcracks, and the processing flexibility is high, but with the increase of the processing depth of the groove structure, the processing products are deposited in the groove and are difficult to remove, and the processing efficiency and processing quality cannot meet the industrial requirements; and the overall processing efficiency of electrochemical jet processing is slow, which cannot meet the actual needs of efficient processing. For example, in the tube electrode jet electrolytic processing, the electrochemical reaction area per unit time is small, and the electrochemical dissolution current is small, so its processing efficiency is low. In addition, there are also problems such as the processed surface is easily impacted by the electrolyte and secondary stray corrosion occurs.

[0004] How to improve the processing quality in the processing of deep groove structures while ensuring high processing efficiency is a key issue that needs to be urgently solved in this field. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a flexible arc electrode sweeping laser and electrolysis composite processing device and method, which transmits the laser beam through the electrolyte flowing in the flexible arc electrode, and emits it from the side hole group structure of the flexible arc electrode to reach the surface of the workpiece, and uses air flow jet to assist processing, thereby realizing sweeping processing of deep groove structures and rapid leveling of high-speed additive metal surfaces, effectively increasing the real-time processing area of ​​the tool electrode, and greatly improving the overall processing efficiency.

[0006] The present invention achieves the above technical objectives through the following technical means.

[0007] A flexible arc electrode sweeping laser and electrolysis composite processing device, wherein the flexible arc electrode is provided with a right-side group hole structure, the laser beam passes through the electrolyte in the flexible arc electrode and is totally reflected and conducted in the flexible arc electrode, and part of the laser beam is emitted from the right-side group hole structure and irradiated to the surface of the workpiece to be processed.

[0008] In the above solution, the flexible arc-shaped electrode has a hollow structure, and its side wall from the outside to the inside is successively: an outer insulating coating, an intermediate metal layer, and a laser beam reflection coating.

[0009] In the above solution, the flexible arc-shaped electrode is an asymmetric U shape, and a baffle is arranged inside the flexible arc-shaped electrode; on the outer side wall of the bottom of the flexible arc-shaped electrode, a right-side group hole structure and a left-side group hole structure are distributed.

[0010] In the above solution, the air flow flows out from the air pressure source and flows in the pipeline, passes through the gas filter and the adjustable throttle valve and enters the flexible arc-shaped electrode, and then sprays out through the left-side group hole structure.

[0011] In the above solution, the left-side group hole structure is used to spray the air flow, so as to prevent the electrolyte from impacting the machined surface during the machining process.

[0012] In the above solution, taking the baffle as the boundary, the projected area of the right side of the flexible arc-shaped electrode in the vertical direction is larger than that of the left side in the vertical direction; the curvature of the right side of the flexible arc-shaped electrode is smaller than that of the left side.

[0013] In the above solution, the workpiece is placed in the liquid retaining tank, the liquid retaining tank is installed on the servo feed device, and the servo feed device is placed on the lathe bed; the workpiece is driven to move through the servo feed device.

[0014] In the above solution, the laser beam is emitted by the laser emitter, and during the machining of the workpiece, the laser power is 10 - 20W.

[0015] For the machining method of the flexible arc-shaped electrode sweep laser and electrolysis composite machining device, before starting the machining, first adjust the position of the workpiece, adjust the workpiece to the position of the flexible arc-shaped electrode, start the electrolyte system, and the electrolyte starts to circulate and filter. At this time, the thin electrolyte flow shoots out from the right-side group hole structure, and the thin electrolyte flow is gradually stabilized by adjustment; the air flow flows out from the air pressure source, the adjustable throttle valve is adjusted to control the air flow to a suitable flow rate, the air flow flows into the flexible arc-shaped electrode, and then sprays out from the left-side group hole structure;

[0016] Then, turn on the laser emitter, adjust the laser light path and the relative position with the flexible arc-shaped electrode until the laser beam can be stably conducted, totally reflected and conducted in the thin electrolyte flow, and irradiate the machining area on the surface of the workpiece. Adjust the power of the laser emitter to the normal machining value, connect the workpiece to the positive electrode of the power supply, connect the flexible arc-shaped electrode to the negative electrode of the power supply, turn on the power supply, and officially start the machining; during the machining, the flexible arc-shaped electrode remains stationary, and under the action of the servo feed device, the workpiece moves along the x-axis direction from the initial position. After the flexible arc-shaped electrode completes a sweep machining on the surface of the workpiece, the servo feed device controls the workpiece to return to the initial position and feeds one machining depth in the z-axis direction. This process is repeated until the machining is completed.

[0017] The present invention has the following advantages:

[0018] 1. The efficiency of the present invention is higher than that of conventional tube electrode jet electrolytic machining. The principle is that the electrochemically reactive area per unit time is large and the electrochemical dissolution current is high, so the machining efficiency is high.

[0019] 2. The device of the present invention can quickly remove the oxide layer that hinders the electrochemical reaction by means of the thermal effect of the laser, thereby further improving the machining efficiency.

[0020] 3. The sweeping motion of the high-speed sweeping machining of the device of the present invention is conducive to driving the machining products out of the machining area. Compared with the immersion machining or external flushing machining methods, the method of strong internal liquid spraying can improve the discharge efficiency of the machining products, and thus improve the machining efficiency and machining stability.

[0021] 4. The device of the present invention uses air flow jet-assisted machining to prevent the electrolyte from impacting the machined surface during machining, causing secondary electrochemical corrosion to the machined surface, and improving the machining surface quality.

[0022] 5. The flexible arc electrode of the device of the present invention is in an asymmetric U shape, which can avoid interference with the workpiece during machining and can provide a larger machining area at the same time.

[0023] 6. In the present invention, the strong electrolyte fine stream has an impact on the machining products. The electrolyte flushes the workpiece surface and takes away the machining products and heat; the air flow forms a protection for the machined surface and cleans the machined surface at the same time, and the laser quickly removes the oxide layer that hinders the electrochemical reaction during machining.

[0024] 7. The present invention can realize the sweeping machining of the deep groove structure, thereby effectively increasing the scanning machining coverage area of the tool electrode, and thus significantly improving the machining efficiency. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of a flexible arc electrode sweeping laser and electrolysis composite machining device according to an embodiment of the present invention;

[0026] Figure 2 is Figure 1 a schematic diagram of the working principle of the flexible arc electrode involved therein;

[0027] Figure 3 is a state diagram during the scanning of a conventional tube electrode;

[0028] Figure 4 is a state diagram during the scanning of the flexible arc electrode of the present invention.

[0029] Reference Signs:

[0030] 1 - Monitoring center; 2 - Laser emitter; 3 - Beam expander; 4 - Laser beam; 5 - Flexible arc-shaped electrode; 6 - Insulating coating; 7 - Metal layer; 8 - Laser beam reflection coating; 9 - Thin electrolyte stream; 10 - Baffle; 11 - Right-side group hole structure; 12 - Left-side group hole structure; 13 - Airflow pipeline; 14 - Adjustable flow valve; 15 - Airflow filter; 16 - Air pressure source; 17 - Power supply; 18 - Bed body; 19 - Servo feed device; 20 - Workpiece; 21 - Liquid retaining tank; 22 - Liquid storage tank; 23 - Filter; 24 - Pump; 25 - Overflow valve; 26 - Pipeline; 27 - Pressure regulating valve; 28 - Tube electrode; 29 - Electrolyte; 30 - Airflow; 31 - Machining area. Detailed implementation manners

[0031] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0033] In the present invention, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Flexible arc electrode sweeping laser and electrolysis composite machining device. The flexible arc electrode 5 is connected to the negative pole of the power supply 17, and the workpiece 20 is connected to the positive pole of the power supply 17. There is a stable potential difference between the flexible arc electrode 5 and the workpiece 20.

[0035] In the present invention, the flexible arc electrode 5 is a composite material. The outer layer is an insulating coating 6, the middle layer is a metal layer 7, and the inner layer is a laser beam reflection coating 8, which are wrapped in sequence from the outside to the inside.

[0036] In the present invention, the flexible arc electrode 5 is an asymmetric U shape, with a group hole structure opened on both side surfaces of the bottom, and the left and right sides are separated by a baffle 10.

[0037] In the present invention, the laser beam 4 passes through the electrolyte 29 inside the flexible arc electrode 5 and realizes total reflection conduction inside, and shoots out from the right group hole structure 11 to reach the surface of the workpiece 20.

[0038] In the present invention, the laser beam 4 is emitted by the laser generator 2 along the Z direction, and after being expanded by the beam expander 3, it is injected into the flexible arc electrode 5.

[0039] In the present invention, strong air flow flows out from the air pressure source 16, flows in the pipeline 13, passes through the gas filter 15 and the adjustable throttle valve 14, and flows into the flexible arc electrode 5.

[0040] In the present invention, after the air flow flows into the flexible arc electrode 5, it sprays out from the left group hole structure 12, is separated by the baffle 10, and interferes with the electrolyte sprayed out from the right group hole structure 11.

[0041] In the present invention, the workpiece 20 is placed in the liquid retaining tank 21, the liquid retaining tank 21 is installed on the servo feeding device 19, and the servo feeding device 19 is placed on the bed 18.

[0042] In the present invention, the liquid storage tank 22 in the electrolyte circulation system is divided into left and right sides, which are a turbid liquid tank and a clean liquid tank respectively, and the two sides are connected by a filter 23. The turbid electrolyte in the turbid liquid tank reaches the clean liquid tank after being filtered by the filter 23.

[0043] In the present invention, the monitoring center 1 controls the laser generator 2, the power supply 17 and the servo feeding device 19.

[0044] In the present invention, the flexible arc electrode sweeping laser and electrolysis composite machining device includes an air flow supply system, an electrolyte circulation system, a power supply system, a monitoring system, a servo feeding device, a laser processing system and an electrochemical processing system;

[0045] In an electrochemical machining system, a flexible arc-shaped electrode 5 is connected to the negative electrode of a power supply 17, and a workpiece 20 is connected to the positive electrode of the power supply 17. An electrolyte 29 flows into one end of the flexible arc-shaped electrode 5, flows to a right-side group of holes structure 11, and sprays out from the right-side group of holes structure 11 to form an electrolyte fine stream 9 that reaches the machining position of the workpiece 20, forming a conductive circuit between the flexible arc-shaped electrode 5 and the workpiece 20 to achieve electrochemical machining. The strong electrolyte fine stream 9 impacts the machining products, promoting the removal of the machining products.

[0046] The outer layer of the flexible arc-shaped electrode 5 is an insulating coating 6. When the flexible arc-shaped electrode 5 sweeps over the workpiece 20, due to the effect of the insulating coating 6, there will be no interaction between the flexible arc-shaped electrode 5 and the workpiece 20; the middle layer is a metal layer 7, which is connected to the negative electrode of the power supply 17 and provides a negative potential for the electrolyte flowing inside the flexible arc-shaped electrode 5; the inner layer is a laser beam reflection coating 9, whose function is to totally reflect the laser beam 4 incident on the flexible arc-shaped electrode 5, ensuring that when the laser beam 4 is optically guided out of the right-side group of holes structure 11 in the electrolyte fine stream 9, its power will not be significantly attenuated, so that the laser energy reaching the workpiece 20 meets the machining requirements. The flexible arc-shaped electrode 5 is in an asymmetric U shape, and the projected area of the effective machining electrode part on the right side in the vertical direction is larger than the projected area of the auxiliary machining electrode part on the left side, avoiding interference between the flexible arc-shaped electrode 5 and the workpiece 20 and reducing machining dead corners.

[0047] In a laser machining system, a laser generator 2 emits a laser beam 4, which is expanded by an expander 3 and incident on the flexible arc-shaped electrode 5 along the illustrated Z-axis direction. Inside the flexible arc-shaped electrode 5, the laser beam 4 is incident on the inner laser beam reflection coating 8, reflects several times inside the flexible arc-shaped electrode 5, and forms an effect of water-guided laser with the electrolyte fine stream 9 ejected from the right-side group of holes structure 11, reaching the surface of the workpiece 20 to achieve laser-electrochemical hybrid machining. The thermal effect of the laser rapidly removes the oxide layer that hinders the electrochemical reaction during the machining process, improving the machining efficiency. In the present invention, the material of the laser beam reflection coating 8 is polyimide.

[0048] In an air flow supply system, air flow flows out from a pressure source 16, passes through an air flow pipeline 14 and flows to an air filter 15. The air filter 15 filters the air flow flowing out from the pressure source 16 to remove impurities that affect the machining quality. The air flow filtered by the air filter 15 flows to an adjustable throttle valve 13, and the air flow rate is controlled by changing the throttle section to adjust the air flow incident on the flexible arc-shaped electrode 5 to meet different machining requirements. After the air flow flows into the flexible arc-shaped electrode 5, it sprays out from the left-side group of holes structure 12 to generate an air flow protection layer on the machined area of the surface of the workpiece 20 corresponding to the group of holes structure. The electrolyte fine stream 9 ejected from the right-side group of holes structure 11 does not contact the machined area. At the same time, the air flow cleans the machined surface. The left and right sides of the flexible arc-shaped electrode 5 are separated by baffles 10, and the air flow and the electrolyte 29 inside the flexible arc-shaped electrode 5 do not interfere with each other.

[0049] In the electrolyte circulation system, the electrolyte 29 in the liquid storage tank 21 flows out from the right side tank of the liquid storage tank 21 under the traction of the pump 24, and flows through the pipeline 26 to the flexible arc-shaped electrode 5. Part of the electrolyte 29 flows into the flexible arc-shaped electrode 5 through the pressure regulating valve 27, and part of the electrolyte 29 flows back to the left side tank of the liquid storage tank 22 through the overflow valve 25. After the electrolyte 29 is processed through the flexible arc-shaped electrode 5, it flows back to the left side tank of the liquid storage tank 22. The electrolyte in the left side tank of the liquid storage tank 22 is filtered by the filter 23 and then flows back to the right side tank of the liquid storage tank 22.

[0050] In the power supply system, the positive pole of the power supply 17 is connected to the workpiece 20, and the negative pole of the power supply 17 is connected to the flexible arc-shaped electrode 5. In the monitoring system, the monitoring center 1 controls the laser generator 2, the power supply 17 and the servo feed device 19. Among them, the workpiece 20 is placed in the liquid retaining tank 21, the liquid retaining tank 21 is installed on the servo feed device 19, and the servo feed device 19 is placed on the bed 18.

[0051] Combined with the attached Figure 1 and Figure 2As shown, before starting the machining, first adjust the position of the workpiece through the control system, and adjust the workpiece 20 to a position closer to the flexible arc-shaped electrode 5. Start the electrolyte circulation system, and the electrolyte begins to circulate and filter. At this time, the thin electrolyte stream 9 shoots out from the right-side group hole structure 11, and the adjustment system makes the thin electrolyte stream 9 gradually stable. Open the air supply system, and the air flows out from the air pressure source 16. Adjust the adjustable throttle valve 14 to control the air flow to a suitable flow rate. The air flows into the flexible arc-shaped electrode 5 and then sprays out from the left-side group hole structure 12. Among them, the air flow velocity is 30 - 40 m / s. Then, turn on the laser emitter 2 and adjust the laser optical path and the relative position with the flexible arc-shaped electrode 5 with a relatively low power. Specifically, the power of the laser emitter is set to 0.5 W until the laser beam 4 can be stably conducted, totally reflected and conducted in the thin electrolyte stream 9, and irradiate the machining area on the workpiece surface. Adjust the power of the laser emitter to the normal machining value of 10 - 20 W. Connect the workpiece 20 to the positive pole of the power supply 17, and connect the flexible arc-shaped electrode 5 to the negative pole of the power supply 17. Turn on the power supply 17 to officially start the machining. During the machining, the flexible arc-shaped electrode 5 remains stationary. Under the action of the servo feeding device 19, the workpiece 20 moves along the x-axis direction from the initial position. After the flexible arc-shaped electrode 5 completes a sweep machining on the surface of the workpiece 20, the servo feeding device 19 controls the workpiece to return to the initial position and feeds one machining depth in the z-axis direction. Repeat this process until the machining is completed. During the machining process, the thin electrolyte stream contacts the workpiece being machined, forming a conductive circuit between the flexible arc-shaped electrode and the workpiece, realizing electrochemical machining. The strong thin electrolyte stream has an impact on the machining products. When the electrolyte leaves the workpiece surface, it takes away the machining products and heat; the air flow forms a protection for the machined surface and cleans the machined surface at the same time. The thermal effect of the laser quickly removes the oxide layer that hinders the electrochemical reaction during the machining process, and at the same time forms water-guided laser with the thin electrolyte stream, improving the machining efficiency. Through the monitoring system, control the laser generator, power supply and servo feeding device to adjust the laser power, potential difference and feeding speed to meet different machining requirements, and realize the sweep machining of the deep groove structure and the rapid leveling of the high-speed additive metal surface.

[0052] Combined with the attached Figure 3 and 4 As shown, it can be seen from the figure that the machining area 31 when the tube electrode 28 machines the workpiece is smaller than the machining area 31 when the flexible arc-shaped electrode 5 machines the workpiece. Therefore, using the flexible arc-shaped electrode 5 can effectively increase the scanning machining coverage area of the tool electrode, and thus significantly improve the machining efficiency.

[0053] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0054] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and purposes of the present invention.

Claims

1. A flexible arc-shaped electrode sweeping type laser and electrolytic composite machining device, characterized in that, The flexible arc-shaped electrode (5) is provided with a right-side group hole structure (11). The laser beam (4) passes through the electrolyte (29) inside the flexible arc-shaped electrode (5) and is totally reflected and conducted inside the flexible arc-shaped electrode (5). Part of the laser beam (4) shoots out from the right-side group hole structure (11) and irradiates the surface of the workpiece (20) to be machined. The flexible arc-shaped electrode (5) is a hollow structure, and its side wall from outside to inside is successively: an outer insulating coating (6), an intermediate metal layer (7), and a laser beam reflection coating (8). The flexible arc-shaped electrode (5) is an asymmetric U shape. A baffle (10) is arranged inside the flexible arc-shaped electrode (5). Taking the baffle (10) as the boundary, the projected area of the right side of the flexible arc-shaped electrode (5) in the vertical direction is larger than that of the left side in the vertical direction. The curvature of the right side of the flexible arc-shaped electrode (5) is smaller than that of the left side. The right-side group hole structure (11) and the left-side group hole structure (12) are distributed on the outer side wall of the bottom of the flexible arc-shaped electrode (5). The air flow flows out from the air pressure source (16), flows in the pipeline (13), enters the flexible arc-shaped electrode (5) after passing through the gas filter (15) and the adjustable throttle valve (14), and then sprays out through the left-side group hole structure (12). The left-side group hole structure (12) is used to spray the air flow so as to prevent the electrolyte (29) from impacting the machined surface during the machining process.

2. The flexible arc-shaped electrode sweeping laser and electrolytic compound machining device according to claim 1, wherein The workpiece (20) is placed in the liquid retaining tank (21). The liquid retaining tank (21) is installed on the servo feeding device (19), and the servo feeding device (19) is placed on the bed body (18). The workpiece (20) is driven to move by the servo feeding device (19).

3. The flexible arc-shaped electrode sweeping laser and electrolytic composite machining device according to claim 1, wherein, The laser beam (4) is emitted by the laser emitter (2). When machining the workpiece (20), the laser power is 10 - 20 W.

4. The machining method of the flexible arc-shaped electrode sweeping laser and electrolysis composite machining device according to any one of claims 1 - 3, characterized in that Before starting the machining, first adjust the position of the workpiece (20), adjust the workpiece (20) to the position of the flexible arc-shaped electrode (5), start the electrolyte system, and the electrolyte (29) starts to circulate and filter. At this time, the electrolyte thin stream (9) shoots out from the right-side group hole structure (11), and the electrolyte thin stream (9) is gradually stabilized by adjustment. The air flow flows out from the air pressure source (16), the adjustable throttle valve (14) is adjusted to control the air flow to a suitable flow rate, the air flow flows into the flexible arc-shaped electrode (5), and then sprays out from the left-side group hole structure (12). Then, turn on the laser emitter (2), adjust the laser optical path and the relative position with the flexible arc electrode (5) until the laser beam (4) can conduct stably, conduct by total reflection in the thin electrolyte stream (9) and irradiate the machining area on the surface of the workpiece (20). Adjust the power of the laser emitter (2) to the normal machining value, connect the workpiece (20) to the positive pole of the power supply (17), connect the flexible arc electrode (5) to the negative pole of the power supply (17), turn on the power supply (17), and officially start machining. During machining, the flexible arc electrode (5) remains stationary. Under the action of the servo feeding device (19), the workpiece (20) moves along the x-axis direction from the initial position. After the flexible arc electrode (5) completes a sweeping machining on the surface of the workpiece (20), the servo feeding device (19) controls the workpiece (20) to return to the initial position and feeds once in the z-axis direction by the depth to be machined. Repeat this process until machining is completed.

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