Cutter, numerical control machining equipment and method for machining graphite electrode

Abstract

The invention discloses a tool for machining a graphite electrode, numerical control machining equipment and a method, and relates to the field of graphite electrode machining, and the key point of the technical scheme is that the tool comprises a cutting edge, a tool bar and a positioning structure; the cutting edge is arranged at one end of the cutter bar, and the positioning structure is fixed on the side wall of the cutter bar. The positioning structure is arranged on the cutter bar, and the cutter mounting length is limited to be the fixed length through mechanical limiting of the positioning structure, namely the length of the cutter bar on the side, away from the cutting edge, of the positioning structure. When a plurality of tools of the same specification are used on one tool base, tool setting operation only needs to be carried out when the tools of the same specification are installed on the tool base for the first time, and the angle clearing efficiency of the inner sharp angle of the graphite electrode is remarkably improved. On the basis, the invention further provides numerical control machining equipment and a numerical control machining method for conducting special-shaped graphite electrode inner sharp corner cleaning operation through the cutter, and high-precision and high-efficiency special-shaped graphite electrode inner sharp corner cleaning operation can be achieved.

Description

Technical Field

[0001] The invention relates to the field of graphite electrode processing, and in particular to a tool, numerical control processing equipment and method for processing graphite electrodes. Background Art

[0002] Special-shaped graphite electrodes are often used in EDM. This type of electrode includes a base and a polygonal prism. The top surface of the base is a horizontal plane, and the polygonal straight prism is set on the top surface of the base. The cross section of the polygonal straight prism has an inwardly concave sharp corner, which is called an inner sharp corner. The inner sharp corner will significantly increase the difficulty of machining the graphite electrode. Since graphite is a brittle and hard material, the graphite powder generated during machining is easy to cause tool wear.

[0003] If the inner sharp corners of the graphite electrode are processed manually, problems such as graphite breakage, excessive cleaning and residual cleaning are likely to occur. Among them, excessive cleaning will cause steel residue to remain when the graphite electrode is used for EDM operation; residual cleaning will cause steel overcutting when the graphite electrode is used for EDM operation.

[0004] If machining is used to process the inner corners of graphite electrodes, the tool needs to be replaced frequently. Moreover, the tool bar of commonly used tools is a column, and the tool length needs to be manually controlled. Therefore, each time the tool is replaced, it is necessary to re-calibrate the tool, which means that when machining graphite electrodes with inner corners, a lot of time is needed to perform tool calibration operations, which limits the efficiency of clearing the inner corners of graphite electrodes. Summary of the invention

[0005] Aiming at the problem that the machining tool setting is time-consuming and the machining efficiency is low in the current process of machining the inner angle of special-shaped graphite electrodes, the present invention provides a tool for machining graphite electrodes, which comprises a cutting edge, a tool rod and a positioning structure. The cutting edge is arranged at one end of the tool rod, and the positioning structure is fixed to the side wall of the tool rod.

[0006] The present invention is further configured as follows: the positioning structure is a projection that is spaced around the circumference of the knife rod; or, the knife rod passes through the positioning structure, and the positioning structure is annular.

[0007] The present invention is further configured such that: the cutter is integrally formed.

[0008] The present invention is further configured as follows: the tool rod is cylindrical, and the cutting edge is colinear with the tool rod axis.

[0009] The present invention is further configured as follows: the tool also includes a clearance surface, which is a conical surface, which is arranged at one end of the tool rod close to the cutting edge, the diameter of the clearance surface close to the cutting edge is equal to the maximum diameter of the cutting edge, and the diameter of the clearance surface away from the cutting edge is equal to the diameter of the tool rod.

[0010] The present invention is further configured such that: the tip diameter of the cutting edge is 0.05-0.3 mm.

[0011] The present invention also provides a CNC machining device for machining graphite electrodes, wherein the tool used by the CNC machining device is the above-mentioned tool; the CNC machining device comprises a tool seat and a fixture, wherein the tool seat is used to clamp the tool, and the fixture is used to fix the graphite electrode to be cleaned.

[0012] The present invention is further configured as follows: the tool seat has a fixed locking device, the tool rod of the tool is clamped in the fixed locking device, the positioning structure of the tool is against the fixed locking device, and the angle between the cutting edge of the tool and the horizontal plane is fixed and acute.

[0013] The present invention is further configured such that the axis of the cutting edge of the tool forms an angle of 45° with the horizontal plane.

[0014] The present invention is further configured as follows: the fixture includes a base and a movable seat, the movable seat is connected to the top of the base, the movable seat can adjust its position relative to the base around a vertical axis, and the graphite electrode to be cleaned is installed above the movable seat.

[0015] The present invention also provides a method for processing graphite electrodes: using the above-mentioned CNC processing equipment, when clearing corners, the tool seat can be longitudinally translated in the CNC processing equipment, the angle between the cutting edge of the tool and the horizontal plane is fixed and acute, and by adjusting the fixture, the graphite can adjust its position relative to the tool seat around the vertical axis on the fixture.

[0016] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0017] The present invention sets a positioning structure on the tool rod, and limits the tool installation length to a fixed length through the mechanical limit of the positioning structure, that is, the length of the tool rod on the side of the positioning structure away from the cutting edge. When a tool holder uses multiple tools of the same specification, it is only necessary to perform tool alignment when the tool of this specification is installed on the tool holder for the first time, which significantly improves the efficiency of clearing the inner sharp corners of the graphite electrode. On this basis, the present invention also provides a CNC machining device and method for clearing the inner sharp corners of special-shaped graphite electrodes using the above-mentioned tool, which helps to achieve high-precision and high-efficiency clearing of the inner sharp corners of special-shaped graphite electrodes.

[0018] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0020] Figure 1 It is a schematic diagram of a tool in Embodiment 1;

[0021] Figure 2 is a schematic diagram of a cross-shaped graphite electrode;

[0022] Figure 3 This is a schematic diagram of the use status of the CNC machining equipment in Example 1;

[0023] Figure 4 It is an exploded schematic diagram of the fixture structure of the CNC machining equipment in the first embodiment;

[0024] Figure 5 This is a schematic diagram of the tool holder and tool assembly of the CNC machining equipment in Example 1;

[0025] Figure 6 It is a schematic diagram of the bonding state between the tool and the cross-shaped graphite electrode in Example 1.

[0026] In the figure: 1. tool; 11. cutting edge; 12. tool bar; 13. positioning structure; 14. air-avoiding surface; 2. cross-shaped graphite electrode; 21. base; 22. cross-shaped prism; 31. Z-axis linear module; 311. Z-axis lead screw; 312. Z-axis guide rail; 313. Z-axis frame; 314. Z-axis control motor; 32. working platform; 321. horizontal line groove; 33. fixture; 331. base; 3311. first clamping structure; 3312. first protrusion; 3313. second protrusion; 332. movable Moving seat; 3321, second clamping structure; 3322, groove; 333, connecting seat; 334, bolt; 34, tool seat; 341, fuselage; 342, threaded sleeve; 343, fixing locking device; 344, second motor; 35, X-axis linear module; 351, X-axis lead screw; 352, X-axis guide rail; 353, X-axis frame; 354, X-axis control motor; 36, Y-axis linear module; 361, Y-axis lead screw; 362, Y-axis guide rail; 363, Y-axis frame; 364, Y-axis control motor.

[0027] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0029] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Embodiment 1

[0032] like Figure 1 The tool 1 for machining graphite electrodes in the first embodiment of the present invention is shown. The tool 1 comprises a cutting edge 11, a tool bar 12 and a positioning structure 13. The cutting edge 11 is arranged at one end of the tool bar 12, and the positioning structure 13 is fixed to the side wall of the tool bar 12.

[0033] When the tool is installed, the tool seat 34 abuts against the positioning structure 13 , and the installed tool length is equal to the length of the tool rod 12 on the side of the positioning structure 13 away from the cutting edge 11 .

[0034] Specifically, the tool bar 12 is cylindrical, and the cutting edge 11 is colinear with the axis of the tool bar 12. During the corner cleaning operation, the tool 1 can rotate around its own axis to obtain a more uniform cutting effect and improve the corner cleaning accuracy. The cutting edge 11 is conical, and its tip is a spherical surface.

[0035] Specifically, the conical surface of the cutting edge 11 is further provided with at least one spiral cutting groove distributed around its own axis to improve the chip removal efficiency of the tool 1, and the spiral cutting groove is not shown in the figure.

[0036] Specifically, the tool 1 further includes an air avoidance surface 14 to prevent the tool 1 from interfering with an area of ​​the workpiece that does not need to be processed. The air avoidance surface 14 is a conical surface, which is arranged at one end of the tool bar 12 close to the cutting edge 11, and the diameter of the air avoidance surface 14 close to the cutting edge 11 is equal to the maximum diameter of the cutting edge 11, and the diameter of the air avoidance surface 14 away from the cutting edge 11 is equal to the diameter of the tool bar 12.

[0037] Specifically, the tool bar 12 passes through the positioning structure 13, so that the portion of the tool seat 34 in contact with the positioning structure 13 is evenly distributed 360° around the axis of the tool bar 12, so as to avoid uneven circumferential force on the tool bar 12, which leads to limited processing accuracy. In this embodiment, the positioning structure 13 is annular, and the axis of the positioning structure 13 is colinear with the axis of the tool bar 12.

[0038] Specifically, the tool 1 is integrally formed to improve the connection reliability between the tool rod 12 and the positioning structure 13 .

[0039] Specifically, the tip diameter of the cutting edge 11 is 0.05-0.3 mm to obtain a high-precision corner clearing effect. In this embodiment, the tip diameter of the cutting edge 11 is 0.1 mm.

[0040] When the tool holder 34 uses multiple tools 1 of the same specification, the tool alignment operation only needs to be performed when the tool 1 of the same specification is first installed on the tool holder 34. During subsequent tool changes, due to the limitation of the positioning structure 13, the relative position relationship between the tool 1 and the tool holder 34, that is, the tool installation length, remains consistent after each tool change of the tool 1 of the same specification, so there is no need to perform tool alignment operation after tool change, which significantly improves the efficiency of clearing the sharp corners inside the graphite electrode.

[0041] This embodiment also provides a CNC machining device for machining graphite electrodes, wherein the tool used is the tool 1 for machining the sharp corners of graphite electrodes; the special-shaped graphite electrode is clamped on the fixture of the CNC machining device. The cutting edge 11 of the tool 1 simultaneously cuts two wall surfaces belonging to the same inner sharp corner of the graphite electrode, so as to increase the area to be cut that the cutting edge 11 can contact, thereby improving the corner cleaning effect.

[0042] The CNC machining equipment used in this embodiment is mainly composed of five axis systems, namely, the X-axis, the Y-axis, the Z-axis, the A-axis and the C-axis. Among them, the X-axis, the Y-axis and the Z-axis are linear axes, the X-axis and the Y-axis are horizontal and perpendicular to each other, the Z-axis is vertical, the Y-axis linear module 36 is set in the Y-axis direction, and the Y-axis linear module 36 is used to control the horizontal movement of the cross-shaped graphite electrode 2 to be cleaned, the X-axis linear module 35 is set in the X-axis direction, and the X-axis linear module 35 is used to control the horizontal movement of the tool 1, and the horizontal movement direction of the tool 1 is perpendicular to the horizontal movement direction of the cross-shaped graphite electrode 2 to be cleaned, and the Z-axis linear module 31 is set in the Z-axis direction, and the Z-axis linear module 31 is used to control the vertical movement of the tool 1; the A-axis and the C-axis are rotation axes, the A-axis is used to control the rotation of the tool tip of the tool 1 around the Y-axis, and the C-axis is used to control the rotation of the cross-shaped graphite electrode 2 to be cleaned around the Z-axis. In this embodiment, the angle of the A-axis is fixed and is a preset angle.

[0043] Specifically, the axis of the cutting edge 11 forms an acute angle with the plane where the X-axis and the Y-axis of the CNC machining equipment are located, so that the cutting edge 11 performs the corner clearing operation in the bevel cutting state, thereby improving the corner clearing effect at the intersection of the two walls of the inner sharp corner.

[0044] Specifically, the axis of the cutting edge 11 forms a 45° angle with the plane where the X-axis and Y-axis of the CNC machining equipment are located, which can not only ensure that the cutting edge 11 effectively contacts the inner sharp corner area to be cleaned, but also avoid uneven cutting or dead corner problems caused by excessive bevel angles of the cutting edge 11.

[0045] Specifically, when the inner tip angle to be cleared is 90°, the taper angle of the cutting edge 11 is 60°.

[0046] Figure 2 The cross-shaped graphite electrode 2 shown is one of the special-shaped graphite electrodes. The cross-shaped graphite electrode 2 is taken as an example below to describe the above-mentioned method for processing the graphite electrode. Figure 3-6 , for explanation.

[0047] In this embodiment, the X-axis is realized by the X-axis linear module 35, the Y-axis is realized by the Y-axis linear module 36, and the Z-axis is realized by the Z-axis linear module 31. The linear drive principles of the X-axis linear module 35, the Y-axis linear module 36 and the Z-axis linear module 31 can be the same or different. In this embodiment, the X-axis linear module 35, the Y-axis linear module 36 and the Z-axis linear module 31 are all lead screw linear modules. The lead screw linear module includes a lead screw, a slide, a frame, a control motor and two guide rails. The two guide rails are parallel to the lead screw. The two ends of each guide rail are respectively connected to the frame. The two ends of the lead screw are respectively connected to the frame for rotation. The two guide rails and the lead screw pass through the slide, and the slide is threaded with the lead screw. The output shaft of the control motor is connected to one end of the lead screw to drive the lead screw to rotate around its own axis, as follows:

[0048] The Y-axis frame 363 is supported on the ground, the Y-axis screw 361 is rotatably connected to the Y-axis frame 363, the two Y-axis guide rails 362 are fixed to the Y-axis frame 363, the output shaft of the Y-axis control motor 364 is connected to the end of the Y-axis screw 361, the two Y-axis guide rails 362 and the Y-axis screw 361 both pass through the Y-axis slide, the Y-axis slide is threadedly matched with the Y-axis screw 361, and the top surface of the Y-axis slide is fixed with a working platform 32. When the Y-axis control motor 364 drives the Y-axis screw 361 to rotate, the Y-axis slide moves along the axis of the Y-axis screw 361, and the working platform 32 moves with the Y-axis slide. The fixture 33 for clamping the cross-shaped graphite electrode 2 to be cleaned is fixed on the working platform 32.

[0049] The X-axis frame body 353 is fixedly connected to the Y-axis frame body 363, the X-axis lead screw 351 is rotatably connected to the X-axis frame body 353, the two X-axis guide rails 352 are fixed to the X-axis frame body 353, the output shaft of the X-axis control motor 354 is connected to the end of the X-axis lead screw 351, the two X-axis guide rails 352 and the X-axis lead screw 351 both pass through the X-axis slide, the X-axis slide is threadedly matched with the X-axis lead screw 351, and the X-axis slide is fixedly connected to the Z-axis frame body 313. When the X-axis control motor 354 drives the X-axis lead screw 351 to rotate, the X-axis slide moves along the axis of the X-axis lead screw 351, and the Z-axis frame body 313 moves together with the X-axis slide.

[0050] The Z-axis lead screw 311 is rotatably connected to the Z-axis frame 313, the two Z-axis guide rails 312 are fixed to the Z-axis frame 313, the output shaft of the Z-axis control motor 314 is connected to the end of the Z-axis lead screw 311, the two Z-axis guide rails 312 and the Z-axis lead screw 311 all pass through the Z-axis slide, the Z-axis slide is threadedly matched with the Z-axis lead screw 311, and the tool seat 34 for clamping the tool 1 is fixed on the Z-axis slide. When the Z-axis control motor 314 drives the Z-axis lead screw 311 to rotate, the Z-axis slide moves along the axis of the Z-axis lead screw 311, and the tool seat 34 moves with the Z-axis slide.

[0051] The X-axis slide, Y-axis slide and Z-axis slide are not shown in the figure.

[0052] In this embodiment, the top surface of the working platform 32 is a horizontal plane, and is provided with a plurality of horizontal line grooves 321 parallel to the X-axis. The bottom of the clamp 33 is fixed in the horizontal line grooves 321, and the bottom of the clamp 33 can be fixed in different horizontal line grooves 321, and the position of the bottom of the clamp 33 in the horizontal line grooves 321 can be adjusted along the X-axis direction. The connection method between the bottom of the clamp 33 and the working platform 32 includes but is not limited to magnetic attraction, threaded fastener connection and clamping. In this embodiment, the bottom of the clamp 33 has an electromagnet, and the working platform 32 is made of a material that can be adsorbed by a magnet. When the electromagnet at the bottom of the clamp 33 is started, the bottom of the clamp 33 can be firmly adsorbed in the horizontal line groove 321. It should be noted that when the connection method between the bottom of the clamp 33 and the work platform 32 is threaded fastener connection or clamping, the horizontal wire groove 321 should be a convex groove, and the threaded fastener or the clamping structure enters and exits the convex groove from the end of the convex groove. After the threaded fastener or the clamping structure is connected to the bottom of the clamp 33, the wall at the top of the convex groove is clamped between the bottom of the clamp 33 and the threaded fastener or between the bottom of the clamp 33 and the clamping structure.

[0053] In this embodiment, the fixture 33 includes a base 331, a movable seat 332 and a connecting seat 333. A first protrusion 3312 is provided at the bottom of the base 331. The first protrusion 3312 is inserted into the horizontal line groove 321. The first protrusion 3312 has an electromagnet. At least one first protrusion 3312 is provided. In this embodiment, two first protrusions 3312 are provided, and each first protrusion 3312 is respectively inserted into a different horizontal line groove 321. A plurality of second protrusions 3313 are provided at the top of the base 331. All second protrusions 3313 are evenly distributed around the vertical axis of the base 331. A groove 3322 matching the shape of the second protrusion 3313 is provided at the bottom of the movable seat 332. The cross-shaped graphite electrode 2 to be cleaned can be detachably connected to the top surface of the connecting seat 333. In the cross-shaped graphite electrode 2, the top surface of the base 21 is horizontal, and the two walls of the cross-shaped prism 22 belonging to the same inner sharp angle are both at an angle of 45° with the X-axis. The connection methods between the cross-shaped graphite electrode 2 to be cleaned and the connecting seat 333 include but are not limited to threaded connection, clamping, magnetic attraction and clamping. In this embodiment, two bolts 334 are used to pass through the connecting seat 333 and are threadedly connected to the base 21 of the cross-shaped graphite electrode 2 to be cleaned. The connecting seat 333 is detachably connected to the top of the movable seat 332. The connection methods between the two include but are not limited to threaded connection and clamping. In this embodiment, a plurality of screws are used to connect the connecting seat 333 and the movable seat 332 together, and the screws are not shown in the figure. The movable seat 332 is detachably connected to the top of the base 331. When the two are connected, a second protrusion 3313 is inserted into each groove 3322. By replacing the second protrusion 3313 in the same groove 3322, the rotation of the cross-shaped graphite electrode 2 to be cleaned around the Z axis, that is, the adjustment of the C axis, is achieved. In this embodiment, four second protrusions 3313 and four grooves 3322 are provided. Each time the second protrusion 3313 is replaced in the same groove 3322, the cross-shaped graphite electrode 2 to be cleaned will rotate around the Z axis by multiples of 90°. The connection method between the movable seat 332 and the base 331 includes but is not limited to threaded connection and snap connection. In this embodiment, the bottom of the movable seat 332 and the top of the base 331 are provided with a first snap-fit ​​structure 3311 and a second snap-fit ​​structure 3321 that match each other. The first snap-fit ​​structure 3311 and the second snap-fit ​​structure 3321 realize the detachable connection between the movable seat 332 and the base 331 through snap-fit ​​cooperation.

[0054] In this embodiment, the A-axis angle is fixed, and the tool seat 34 can only be translated up and down under the drive of the Z-axis slide. The tool seat 34 cannot rotate, and the axis of the tool 1 mounted on the tool seat 34 is at an angle of 45° with the horizontal plane. It should be noted that if the A-axis angle needs to be adjusted during the angle cleaning, the tool seat 34 should rotate the slide connected to the Z-axis, and a first motor is provided to control the rotation angle of the tool seat 34 on the slide of the Z-axis, and the rotation axis of the tool seat 34 is parallel to the Y-axis.

[0055] The tool holder 34 is clamped in a manner including, but not limited to, magnetic attraction and clamping. In this embodiment, the body 341 of the tool holder 34 is provided with a mounting groove, and the mounting groove is used to accommodate the shank 12 of the tool 1. A threaded sleeve 342 is threadedly connected at the notch of the mounting groove, and a fixed locking device 343 is clamped between the groove wall of the mounting groove and the threaded sleeve 342. The shank 12 of the tool 1 is inserted into the fixed locking device 343. As the length of the fixed locking device 343 in the mounting groove increases, the fixed locking device 343 undergoes elastic deformation to clamp the shank 12 of the tool 1, and at this time, the positioning structure 13 of the tool 1 is pressed against the fixed locking device 343. The tool holder 34 has a second motor 344 for driving the tool 1 to rotate around its own axis, and the output shaft of the second motor 344 is connected to the body 341.

[0056] This embodiment also provides a method for processing a graphite electrode, the steps are as follows:

[0057] S1, loosen the threaded fit between the threaded sleeve 342 and the body 341, insert the tool shank 12 of the tool 1 into the fixed locking device 343, and tighten the threaded sleeve 342 on the body 341. As the length of the fixed locking device 343 in the installation groove increases, the fixed locking device 343 undergoes elastic deformation to clamp the tool shank 12 of the tool 1. At this time, the positioning structure 13 of the tool 1 is pressed against the fixed locking device 343. The tool 1 for processing graphite electrodes provided in this embodiment is clamped on the tool seat 34 of the CNC machining equipment.

[0058] At the same time, the connecting seat 333 is detached from the top of the movable seat 332, and the two bolts 334 pass through the connecting seat 333 and cooperate with the base 21 of the cross-shaped graphite electrode 2 to complete the connection between the cross-shaped graphite electrode 2 and the connecting seat 333. Then, the connecting seat 333 is re-fixed on the top of the movable seat 332 by screws. At this time, the two wall surfaces of the cross-shaped prism 22 of the cross-shaped graphite electrode 2 belonging to the same inner corner are at an angle of 45° with the X-axis, and the base 21 of the cross-shaped graphite electrode 2 is clamped on the fixture 33 of the CNC machining equipment.

[0059] When the electromagnet in the first protrusion 3312 is not activated, the two first protrusions 3312 are respectively inserted into the two horizontal grooves 321 of the working platform 32, and then the electromagnets in the two first protrusions 3312 are turned on, and the two first protrusions 3312 are firmly adsorbed in the two horizontal grooves 321 to fix the base 331 on the working platform 32.

[0060] S2, through three linear modules, adjust the relative position of the cross-shaped graphite electrode 2 and the tool 1 from the three directions of X-axis, Y-axis and Z-axis, so that the cutting edge 11 is in contact with the two vertical wall surfaces belonging to the same inner corner of the cross-shaped graphite electrode 2 at the same time to complete the tool setting operation.

[0061] S3, the CNC machining equipment loads the program for machining the inner sharp corner of the graphite electrode in the form of a computer program to perform the current inner sharp corner cleaning operation, at which time the tool 1 rotates around its own axis and moves longitudinally. During this period, if the tool 1 needs to be replaced, the new tool 1 can be clamped on the tool seat 34 in the state where the positioning structure 13 is pressed against the fixing locking device 343 according to the step of clamping the tool 1 on the tool seat 34 in S1, and the corner cleaning operation can be continued without the need for tool setting operation.

[0062] S4, when one inner sharp corner is cleaned, the first clamping structure 3311 and the second clamping structure 3321 are separated to separate the movable seat 332 from the base 331, and then the second protrusion 3313 in each groove 3322 is replaced with another adjacent second protrusion 3313, at which time the cross-shaped graphite electrode 2 will rotate 90° around the Z axis. Then the first clamping structure 3311 and the second clamping structure 3321 are clamped to fix the movable seat 332 on the base 331, and S3 is repeated to clean the next inner sharp corner until all four inner sharp corners of the cross-shaped graphite electrode 2 are cleaned.

[0063] S5, the connecting seat 333 is detached from the top of the movable seat 332, and then the two bolts 334 are detached from the base 21 of the cross-shaped graphite electrode 2, and the cross-shaped graphite electrode 2 after the corners are cleaned can be removed.

[0064] In summary, the present embodiment sets a positioning structure 13 on the tool rod 12, and limits the tool installation length to a fixed length through the mechanical limit of the positioning structure 13, that is, the length of the tool rod 12 on the side where the positioning structure 13 is away from the cutting edge 11. When a tool holder 34 uses multiple tools 1 of the same specification, it is only necessary to perform tool alignment when the tool 1 of this specification is installed on the tool holder 34 for the first time, which significantly improves the efficiency of clearing the inner corners of the graphite electrode. On this basis, the present embodiment also provides a CNC machining device and method for clearing the inner corners of special-shaped graphite electrodes using the above-mentioned tool 1, which helps to achieve high-precision and high-efficiency clearing of the inner corners of special-shaped graphite electrodes.

[0065] Embodiment 2

[0066] The difference between this embodiment and the first embodiment is that the positioning structure 13 is detachably connected or fixedly connected to the knife bar 12. The connection between the positioning structure 13 and the knife bar 12 includes but is not limited to welding, threaded connection and clamping.

[0067] Embodiment 3

[0068] The difference between this embodiment and the first embodiment is that the positioning structure 13 is a protrusion that is arranged at intervals around the circumference of the knife rod 1.

[0069] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A tool for machining graphite electrodes, characterized in that: The tool (1) comprises a cutting edge (11), a tool rod (12) and a positioning structure (13); the cutting edge (11) is arranged at one end of the tool rod (12), and the positioning structure (13) is fixed to the side wall of the tool rod (12).

2. A tool for machining graphite electrodes according to claim 1, characterized in that: The positioning structure (13) is a protrusion that is arranged at intervals around the circumference of the knife rod (1); or, the knife rod (12) passes through the positioning structure (13), and the positioning structure (13) is annular.

3. A tool for machining graphite electrodes according to claim 1, characterized in that: The cutter (1) is integrally formed.

4. A tool for machining graphite electrodes according to any one of claims 1 to 3, characterized in that: The tool rod (12) is cylindrical, and the cutting edge (11) is colinear with the axis of the tool rod (12).

5. A tool for machining graphite electrodes according to claim 4, characterized in that: The tool (1) further comprises a clearance surface (14), which is a conical surface and is arranged at one end of the tool rod (12) close to the cutting edge (11), the diameter of the clearance surface (14) close to the cutting edge (11) is equal to the maximum diameter of the cutting edge (11), and the diameter of the clearance surface (14) away from the cutting edge (11) is equal to the diameter of the tool rod (12).

6. A CNC machining equipment for machining graphite electrodes, characterized in that: The tool used in the CNC machining equipment is the tool (1) described in any one of claims 1 to 5; the CNC machining equipment comprises a tool seat (34) and a fixture (33), the tool seat (34) is used to clamp the tool (1), and the fixture (33) is used to fix the graphite electrode to be cleaned.

7. The CNC machining equipment for machining graphite electrodes according to claim 6, characterized in that: The tool seat (34) has a fixed locking device (343), the tool rod (12) of the tool (1) is clamped in the fixed locking device (343), the positioning structure (13) of the tool (12) is against the fixed locking device (343), and the angle between the cutting edge (11) of the tool (1) and the horizontal plane is fixed and acute.

8. The CNC machining equipment for machining graphite electrodes according to claim 7, characterized in that: The axis of the cutting edge (11) of the tool (1) forms an angle of 45° with the horizontal plane.

9. The CNC machining equipment for machining graphite electrodes according to claim 8, characterized in that: The clamp (33) comprises a base (331) and a movable seat (332), wherein the movable seat (332) is connected to the top of the base (331), and the movable seat (332) can adjust its position relative to the base (331) around a vertical axis.

10. A method for processing a graphite electrode, characterized in that: When using the CNC machining equipment as described in claims 6-9, when clearing corners, the tool seat (34) can be longitudinally translated in the CNC machining equipment, and the angle between the cutting edge (11) of the tool (1) and the horizontal plane is fixed and acute; by adjusting the fixture (33), the graphite electrode can adjust its position relative to the tool seat (34) around the vertical axis.

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