CN114074189A - Cutting tool, cutting tool and method for machining spot welding electrodes - Google Patents

Abstract

A cutting blade for machining a spot welding electrode, the cutting blade comprising a first cutting flute and a second cutting flute which are opposed to each other in an up-down direction, wherein each cutting flute has a cutting surface; the cutting surface comprises a front cutter surface, a rear cutter surface, a transition cutting surface and a cutting edge formed by intersecting the transition cutting surface and the front cutter surface or the rear cutter surface; the transition cutting surface is a plane with a width B or an arc surface with a radius R; the cutting edge directly cuts the welding electrode, and the expansion curve of the cutting edge corresponds to the size and shape of the processed welding surface by a rotating central shaft; the cutting blade performs a rotary cutting motion about a central axis of rotation, and the first and second cutting flutes grind a weld surface of the welding electrode extending into a particular dimensional shape. The invention can reduce the vibration in the electrode cutting process, reduce the friction, improve the cutting quality and prolong the service life of the cutter by increasing the transition cutting surface, and can adapt to the processing requirements of welding surfaces with various sizes and shapes.

Description

Cutting tool, cutting tool and method for machining spot welding electrodes

Technical Field

The invention relates to repair of resistance welding equipment, in particular to a sharpening blade and a sharpening method of a welding electrode, and belongs to the technical field of machinery.

Background

Resistance spot welding is a method in which two or more layers of overlapped workpieces are sandwiched between opposing upper and lower welding electrodes, pressure is applied while contacting and an electric current is passed, and the workpieces are joined by melting materials using heat generated by electric resistance between the workpieces. Resistance spot welding methods are generally used for the laminate welding of two or more layers of homogeneous or heterogeneous workpieces, such as aluminum workpieces and aluminum workpieces, steel workpieces and steel workpieces, aluminum workpieces and steel workpieces, and the like, and are currently the main process of manufacturing automotive steel bodies. In continuous production operation, the welding electrode is subjected to repeated spot welding operation, under the action of mechanical pressure and current, the welding surface at the front end of the welding electrode is abraded and aged to different degrees, and the reason is mainly that the temperature of the welding surface of the electrode is increased in the welding process to cause local plastic deformation, and the reaction between the electrode and a workpiece material is adhered to generate pollutant accumulation. The aging and shape change of the welding electrode can cause the subsequent welding quality to be reduced, the surface of a workpiece is defective, and the like, so that the regular recovery of the welding surface of the welding electrode to the original size and shape is very important, and the rapid and accurate recovery of the welding electrode is ensured in order to not interrupt the manufacturing beat on a production line.

At present, a common method for repairing a welding electrode is to cut the end of the welding electrode by using a grinding cutter installed on grinding equipment after a certain number of welding operations (such as 1000-1200 welding points), and restore the original shape of a remolded welding surface. The key for ensuring the effective recovery of the welding electrode is that waste scraps generated by the sharpening blade in the cutting process can be effectively removed, so that blockage is avoided, the cutting capability of the sharpening blade is reduced, vibration in the cutting process is reduced, and the service life of the sharpening blade is shortened. Optimizing the structural shape and dimensional parameters of the sharpening inserts becomes a crucial issue.

In order to ensure that the shape of the welding electrode can be effectively restored with high quality, the key is to control the stability of the machining process, reduce the vibration in the cutting process and control the cutting amount in the cutting process so as not to cause the blockage of scraps and the reduction of the cutting quality. In addition, the service life of the cutting tool can be effectively increased, which is related to the whole manufacturing cost.

International application No. 200980107423.0 discloses a cutting assembly and method for effectively removing chips from a cutting process by adding a chip removal groove behind the cutting edge to avoid clogging the cutting tool. Although this method can discharge the chips to some extent, the cutting amount cannot be controlled well, and the service life of the cutting edge is low.

Further, although the document of the application No. 201611014874.8 discloses a three-edge integrated cutting tool in which the life of the cutting tool is improved by increasing the number of tool edges, the three-edge cutting tool has a high demand for manufacturing accuracy and a high demand for assembling the entire cutting tool, which leads to a high manufacturing cost.

The document with the application number 201710069631.2 discloses a split multi-edge sharpening unit component to prolong the service life of a cutter, wherein two blades are matched with each other and then matched with an upper cutter holder and a lower cutter holder to form the whole cutting tool, the assembly requirement of the cutting tool on the component is very high, and the processing and manufacturing requirements on each component are also very high.

Therefore, there is a lack of a cutting tool and method that can achieve high quality machining of the electrode cap and a long service life while being inexpensive to manufacture.

Disclosure of Invention

The invention provides a cutting tool, a cutter and a method capable of effectively cutting and restoring a welding electrode, which can more effectively reduce vibration in the cutting process compared with the prior art, enable waste chips to be removed more quickly, improve the cutting quality, prolong the service life of the cutter and reduce the manufacturing cost.

Based on the above purpose, the invention provides the following technical scheme:

providing a cutting blade for machining a spot welding electrode, the cutting blade including a first cutting flute and a second cutting flute which are opposed to each other in an up-down direction, wherein each cutting flute has a cutting surface; the cutting surface comprises a front cutter surface, a rear cutter surface, a transition cutting surface and a cutting edge formed by intersecting the transition cutting surface and the front cutter surface or the rear cutter surface; the transition cutting surface is a plane with a width B or an arc surface with a radius R;

the cutting edge directly cuts the welding electrode, and the expansion curve of the cutting edge corresponds to the size and shape of the processed welding surface by a rotating central shaft;

the cutting blade performs a rotary cutting motion about a central axis of rotation, and the first and second cutting flutes grind a weld surface of the welding electrode extending into a particular dimensional shape.

Preferably, the flank face is perpendicular to a horizontal plane perpendicular to the central axis of rotation.

Preferably, the transition cutting surface is a circular arc surface, and the radius R is 0.001-0.2 mm.

Preferably, the transition cutting face is a plane having an angle of-15 ° to 15 ° with a horizontal plane perpendicular to the central axis of rotation and a width B of 0.001 to 0.5 mm.

Preferably, the transition cutting face has an angle of 0 ° with a horizontal plane perpendicular to the central axis of rotation and a width of 0.05-0.3 mm.

Preferably, the rear face of the cutting blade further comprises at least 1 chip breaker groove.

There is provided a cutting tool comprising one or more cutting inserts as described in any preceding claim and a support and containment body having a recess for receiving the cutting insert.

Preferably, the cutting blade is integrated with or assembled with the support and containment body.

Preferably, the cutting tool has at least 1 flute.

There is provided a method of welding electrode machining using a cutting tool as set forth in any one of the preceding claims, characterized in that the method comprises the steps of:

a) receiving a welding face of a first welding electrode in a first cutting flute of a cutting insert in the cutting tool;

b) receiving a welding face of a second welding electrode in a second cutting flute of a cutting insert in the cutting tool;

c) the cutting edge on the cutting knife in the cutting tool firstly contacts the welding surface of the welding electrode, the cutting edge is enabled to continuously cut by rotating the cutting tool, at least one part of the transition cutting surface is in contact with the welding electrode, so that the vibration of the cutting process is reduced, the geometric shapes of the first welding electrode welding surface and the second welding electrode welding surface are stably cut and restored, and the service life of the cutting tool is prolonged.

Compared with the prior art, the invention can more effectively reduce the vibration in the cutting process, improve the stability of the cutting process, enable the scraps to be removed more quickly, improve the cutting quality, prolong the service life of the cutter and reduce the manufacturing cost.

Drawings

Fig. 1 is a perspective view showing a first embodiment of the cutting blade according to the present invention.

Fig. 2 is an X-direction (front) view in fig. 1.

Fig. 3 is a Z-direction (top) view of fig. 1.

Fig. 4 is a partial sectional view of section a-a in fig. 3.

Fig. 5 is a cross-sectional view of another embodiment of a cutting blade in accordance with the present invention.

Fig. 6 is a cross-sectional view of another embodiment of a cutting blade in accordance with the present invention.

Fig. 7 is a cross-sectional view of another embodiment of a cutting blade in accordance with the present invention.

Fig. 8 is a schematic view of an embodiment of a cutting tool according to the present invention.

Fig. 9 is a schematic view of the cutting blade and welding electrode during cutting by the cutting tool of the embodiment of fig. 1.

Fig. 10 shows another embodiment of a cutting insert having dual cutting edges in accordance with the present invention.

Fig. 11 is a schematic view of the cutting blade and welding electrode of the double-edged cutting blade shown in fig. 9 during machining.

FIG. 12 is a schematic view of a two-edged cutting insert having a concave edge with a convex ring at the center of the welding surface of the machining electrode.

Fig. 13 is a schematic view of a double-edged cutting insert in a state where the insert is machined with asymmetrical weld faces on both sides.

In the figure: 1-a first cutting flute, 2-a second cutting flute, 11-a first flank, 21-a second flank, 121-a first leading edge, 131-a first trailing edge, 221-a second leading edge, 231-a second trailing edge, 122-a third leading edge, 132-a third trailing edge; 222-a fourth leading edge; 232 — fourth trailing edge; 3-rake face, 14-transition cutting face; 4, cutting knife; 5, a main tool apron; 51-tool holder side plane; 52-concave conical surface in the tool apron; 6-fastening screws; 91-upper welding electrode, 92-lower welding electrode, OO '-rotation central axis, PP' -horizontal symmetry plane, 10-plane (basal plane) perpendicular to rotation central axis, beta-angle between flank and plane 10, gamma-angle between transition cutting surface 14 and plane 10, B-width of transition cutting surface, R-radius of fillet.

Detailed Description

The cutting insert, the tool and the cutting method of the welding electrode according to the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are only for illustrating the technical solutions of the present invention and are not intended to limit the scope of the present invention. Furthermore, the drawings are schematic only, and thus the apparatus and devices of the present invention are not limited by the size or scale of the schematic.

It is to be noted that in the claims and the description of the present invention, relational terms such as "first" and "second", and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, same element in a process, method, article, or apparatus that comprises the element.

It should be noted that in the claims and the description of the present invention, positional relationships such as "horizontal", "vertical", "longitudinal", "lateral", "vertical", "up", "down", "clockwise", "counterclockwise", "outer" and "inner" are referred to with respect to the main structure of the machining tool according to the present invention.

It is understood that within the scope of the present invention, the above-mentioned features of the present specification and those specifically described below (e.g., in the examples) may be combined with each other to form new or preferred embodiments. Not to be reiterated herein, but to the extent of space.

Example one

The present embodiment discloses a cutting blade, a cutting tool and a method for simultaneously cutting and restoring the welding surfaces of two welding electrodes facing each other up and down and suffering from different levels of damage. The cutter assembly can simultaneously and respectively cut and trim the welding surfaces of the upper welding electrode and the lower welding electrode, thereby processing the electrode cap with the welding surface having specific geometric characteristics. The cutting process of the welding electrode can be repeated as many times as possible until the welding surfaces no longer support the dressing due to material loss.

Fig. 1, 2, 3 and 4 show a schematic structure of a single-edged symmetrical cutting blade according to the present invention. The cutting blade shown has two cutting flutes 1 and 2 which are opposite one another. Wherein the first cutting flute 1 and the second cutting flute 2 receive the welding surface of the first welding electrode and the welding surface of the second welding electrode, respectively. The cutting blade is rotated counterclockwise about the central axis OO' to machine and restore the welding surfaces of the first and second welding electrodes. The first cutting flute 1 and the second cutting flute 2 are mirror-symmetrical with respect to the horizontal reference plane PP' for cutting the first welding electrode and the second welding electrode having the same structural shape, and have a first cutting surface and a second cutting surface, respectively, the first cutting surface being composed of a first relief surface 11, a rake surface 3 and a transition cutting surface 14. The first cutting surface further comprises a first leading edge 121, a first trailing edge 131, as well as the second cutting surface comprises a second leading edge 221 and a second trailing edge 231; the front edge is formed by integrally forming a certain angle upwards from the rear edge, the front edge refers to the part of the cutter integrally positioned at the highest position, and the rear edge refers to the part of the cutter integrally positioned at the lowest position. When the cutter executes a cutting task, the front edge is firstly contacted with the welding electrode for cutting and trimming. The counterclockwise direction as described herein is defined with reference to the leading and trailing edges of the cutting blade and is not configured to be stationary. The following "front" and "rear" are based on the advancing direction of the rotary cutting motion. Since the cutting flutes 1 and 2 have the same structure, the following description will focus on the first cutting surface in the cutting flute 1 alone.

Fig. 4 is a schematic cross-sectional view taken along a-a in fig. 3. The first cutting surface comprises a front cutter surface 3, a rear cutter surface 11 and a transition cutting surface 14, wherein the transition cutting surface is a circular arc surface with a fillet radius R, and the blunt radius R is 0.001-0.2 mm. The rake face 3 is perpendicular to the base surface 10. The flank face 11 has an angle beta with the base surface 10 in the range 1-30 deg., preferably 3-15 deg.. The presence of the included angle beta can greatly reduce the friction between the cutting surface and the surface of the machined welding electrode, and provide the machining quality of the cutting surface. The transition cutting surface 14 intersects the flank surface 11 to form a leading edge 121, the lowest part of the flank surface 11 is a trailing edge 131, the leading edge 121 serves as a cutting edge, the projection shape of the cutting edge in the longitudinal section is matched with the section shape of the welding electrode, the cutting blade has various specific geometric shapes, and the leading edge serves as the most protruding position of the cutting blade, is firstly contacted with the welding electrode, and directly performs cutting processing on the welding electrode. By carrying out passivation fillet treatment on the cutting edge 121, the microcosmic unevenness of the cutting edge can be reduced, the cutting edge is smooth and flat, the service life of the cutter is prolonged, the cutter breakage is reduced, the processing quality of the surface of an electrode is improved, the cutting process is smoother, the chip removal is easy, and the purpose of carrying out fillet passivation treatment on the cutting edge by using a passivation machine is achieved.

Referring now to fig. 5, 6 and 7, fig. 5 shows a cross-sectional view of a single-edged cutting insert according to another embodiment, differing from fig. 4 in that a transition cutting surface 14 intersects the flank surface 11 to form a leading edge 121, the transition cutting surface being a plane surface, wherein the transition cutting surface 14 makes an angle γ with the base surface 10 in the range-15 ° -15 °, and the width B of the transition cutting surface is 0.001-0.5 mm. When the angle γ is greater than 0 °, as shown in fig. 5, the leading edge 121 is formed by the intersection of the transition cutting surface 14 and the flank 11, and when the angle γ is less than 0 °, as shown in fig. 6, the leading edge 121 is formed by the intersection of the transition cutting surface 14 and the rake face 3, and when the angle is 0, i.e., the transition cutting surface is parallel to the base 10 and perpendicular to the rake face 3, the width B of the transition cutting surface 14 is 0.05-0.3mm, as shown in fig. 7. By adding a section of transitional cutting surface 14 with the width B, the transitional cutting surface can gradually contact with the trimming surface of the welding electrode in the cutting process, so that the service life of the cutter can be prolonged, the cutter breakage can be reduced, the processing quality of the electrode surface can be improved, and the cutting process can be smoother.

Referring now to fig. 8, fig. 8 is a schematic view of a cutting tool according to the present invention. It comprises the single-edged cutting blade 4 as described above, as well as a blade body housing 5, to which a mounting screw 6 is fixed. The entire tool part comprises two cutting flutes, which are symmetrical up and down, as well as chip flutes 7, and the tool body has an up and down symmetrical conical surface 52 of revolution along the body axis OO' and an outer mounting surface 51. Typically, the projected curve of surface of revolution 52 in the Z-axis height direction is lower than the height of cutting blade leading edge 121 to achieve the cutting requirements. And the outer mounting surface 51 is typically one or more surfaces by which the cutting tool is mounted for rotation with the cutting machine.

The cutting blade 4 and the main body housing 5 are fitted together by the set screw 6 in the embodiment, but may be formed by, for example, mechanical fitting, welding, gluing, casting, and integrally molding.

When the cutting tool shown in fig. 8 is used for machining, the main body 5 is rotated counterclockwise around the central axis OO', so as to drive the cutting tool 4 to rotate, and then a certain pressure is applied to extend the first welding electrode 91 and the second welding electrode 92 into the first cutting groove 1 and the second cutting groove 2, so that the first cutting edge and the second cutting edge respectively machine and restore the electrodes to the corresponding geometric shapes. Fig. 10 is a schematic view showing the machining process of the cutting blade and the machined electrode.

The method comprises the following specific steps:

1) preparing the thinning blade, and grinding the first cutting edge 121 and the second cutting edge 122 of the first cutting groove 1 into a predetermined shape as required;

2) the cutting blade is positioned and installed with the body 5 through a positioning screw to form a cutting tool, the cutting tool is installed on a cutting device through an outer installation plane, an upper welding electrode 91 and a lower welding electrode 92 are connected to a C-shaped welding gun or an X-shaped welding gun, current is not applied, and the cutting blade is moved between the opposite upper welding electrode 91 and the lower welding electrode 92;

3) starting a motor of the cutting equipment to drive the cutting blade to rotate anticlockwise through the tool apron;

4) applying pressure to a welding gun to enable the upper welding electrode 91 to enter the first cutting groove 1, enabling the lower welding electrode 92 to enter the second cutting groove 2, simultaneously and respectively cutting and trimming the welding surface of the upper welding electrode 91 and the welding surface of the lower welding electrode 92 through the first cutting edge 121 and the second cutting edge 221, enabling the cutting edge on a cutting knife in the cutting knife to firstly contact the welding surface of the welding electrode, enabling the cutting edge to continuously cut through rotating the cutting knife, enabling at least one part of transition cutting surfaces to be in contact with the welding electrode, reducing vibration in the cutting process, stably cutting and restoring the geometric shapes of the welding surface of the first welding electrode 91 and the welding surface of the second welding electrode 92, and prolonging the service life of the cutting knife.

The cutting amount, pressure and time are determined according to the material and shape structure of the upper welding electrode 91 and the lower welding electrode 92, and generally, the pressure is 400N to 3000N, preferably 500N to 2000N; the cutting time is 500ms to 5000ms, preferably 1000ms to 3500 ms;

the swarf generated by the first and second cutting edges 121 and 221 is discharged out of the cutting tool via the swarf discharge flute 7.

Example two

As shown in fig. 9, the cutting insert of the present embodiment is a double-edged cutting insert, and the machining efficiency and the tool life can be improved by cutting with two edges. The second embodiment is substantially the same as the first embodiment except that a third cutting edge 122 and a fourth cutting edge 222 are added, each of which still has a rounded or transition cutting surface 14.

In this embodiment, the added third cutting edge 122 and the added fourth cutting edge 222 are respectively mirror-symmetrically distributed with the same cross-sectional projection shape as the first cutting edge 121 and the second cutting edge 221. The first cutting edge 121, the third cutting edge 122, the second cutting edge 221 and the fourth cutting edge 222 are used for cutting and machining the first welding electrode and the second welding electrode respectively by rotating along the central axis OO' along the direction of the axis, and fig. 10 is a schematic diagram of the present embodiment in the machining process.

The projected cross-sectional shape of the cutting edge is adapted to the cross-sectional shape of the electrode to be machined, which can be performed when the machined electrode has a particular geometry. For example, fig. 11 shows a modified electrode having a concave center and an annular convex edge, the cutting edge has a shape of a cutting edge having a convex center 124 and a concave annular shape 123.

EXAMPLE III

The embodiment can meet the polishing requirements of the upper welding electrode 91 and the lower welding electrode 92 with different welding surface shapes. The second embodiment is basically the same as the first embodiment, except that the first cutting flutes 1 and the second cutting flutes 2 are no longer symmetrically arranged with respect to the horizontal symmetry plane PP'.

In the present embodiment, the first cutting flute 1 has a similar structure to the second cutting flute 2, but the size and shape of the third cutting edge 122 and the fourth cutting edge 222 are different from those of the first cutting edge 121 and the second cutting edge 221, and are adjusted to have different corresponding sizes according to the operation requirement.

The state of repairing the welding surfaces of the upper welding electrode 91 and the lower welding electrode 92 by using the sharpening blade according to the second embodiment is shown in fig. 12. For example, if the first welding electrode 91 is a welding electrode 13a having a concave welding surface 12a at the center and the second welding electrode is a welding electrode 13a having a spherical surface as a whole, the first cutting edge 121 and the third cutting edge 122 have a convex cross-sectional shape at the center, and the second cutting edge 221 and the fourth cutting edge 222 have a cross-sectional shape corresponding to the welding surface of the second welding electrode.

In the present invention, the cutting insert may be made of various materials that may be used for making tools, including various alloy tool steels, high speed tool steels, cemented carbides, cermets, etc.; it may be subjected to various heat treatment processes including bulk quenching, case quenching, carburizing, nitriding, carbonitriding, and the like. The cutting insert is formed as a whole, for example by casting, sintering, or by machining, such as cutting, grinding, or by wire cutting or electroerosion deposition; the surface of the sharpening blade is coated with a wear-resistant coating such as titanium or aluminum oxide so as to have sufficient wear resistance and sharp cutting performance.

It is noted that the upper and lower welding electrodes 91, 92 described in the present invention may be made of any electrically and thermally conductive material including those suitable for spot welding, which may age during welding, for example, copper alloys such as copper chromium (CuCr) alloys, copper chromium zirconium (CuCrZr) alloys, copper alloys with added aluminum oxide particles, and various other copper alloys that may be used as electrode materials.

The sharpening blade may also be used, if desired, to trim, cut a pair of welding electrodes used in resistance spot welding of dissimilar workpieces, such as aluminum alloys and steel; in addition, the cut and trimmed welding electrode can be used for laminated resistance spot welding of multiple layers of multiple materials, such as resistance spot welding operation of three or four layers with equal thickness or different thicknesses. The overlapping contact surface of the workpiece may contain various adhesives for material joining or epoxy resins with thermosetting effect, for example, Uniseal2343 adhesive with thermosetting effect is filled in the middle layer.

Furthermore, it should be understood that various changes and modifications can be made by those skilled in the art after reading the above disclosure, and equivalents also fall within the scope of the invention as defined by the appended claims.

Claims (10)

1. A cutting blade for machining a spot welding electrode, the cutting blade comprising a first cutting flute and a second cutting flute which are opposed to each other in an up-down direction, wherein each cutting flute has a cutting surface; the cutting surface comprises a front cutter surface, a rear cutter surface, a transition cutting surface and a cutting edge formed by intersecting the transition cutting surface and the front cutter surface or the rear cutter surface; the transition cutting surface is a plane with a width B or an arc surface with a radius R;

the cutting edge directly cuts the welding electrode, and the expansion curve of the cutting edge corresponds to the size and shape of the processed welding surface by a rotating central shaft;

the cutting blade performs a rotary cutting motion about a central axis of rotation, and the first and second cutting flutes grind a weld surface of the welding electrode extending into a particular dimensional shape.

2. The cutting blade according to claim 1 wherein the flank surface is perpendicular to a horizontal plane perpendicular to the central axis of rotation.

3. The cutting insert according to claim 1 wherein the transition cutting surface is a circular arc surface having a radius R of 0.001 to 0.2 mm.

4. The cutting insert according to claim 1, wherein the transition cutting surface is a flat surface having an angle of-15 ° to 15 ° with respect to a horizontal plane perpendicular to the central axis of rotation and a width B of 0.001 to 0.5 mm.

5. The cutting blade according to claim 1, wherein the transition cutting surface has an angle of 0 ° with respect to a horizontal plane perpendicular to the central axis of rotation and a width of 0.05 to 0.3 mm.

6. The cutting insert of claim 1 further comprising at least 1 chip breaker groove in the flank surface of the cutting insert.

7. A cutting tool comprising one or more cutting inserts according to any one of claims 1-5 and a support and containment body having a recess for receiving the cutting insert.

8. The cutting tool of claim 7, wherein the cutting blade is integral with or assembled with the support containment body.

9. The cutting tool of claim 7, wherein the cutting tool has at least 1 flute.

10. A method of welding electrode machining using the cutting tool of any one of claims 7-9, characterized in that the method comprises the steps of:

a) receiving a welding face of a first welding electrode in a first cutting flute of a cutting insert in the cutting tool;

b) receiving a welding face of a second welding electrode in a second cutting flute of a cutting insert in the cutting tool;

c) the cutting edge on the cutting knife in the cutting tool firstly contacts the welding surface of the welding electrode, the cutting edge is enabled to continuously cut by rotating the cutting tool, at least one part of the transition cutting surface is in contact with the welding electrode, so that the vibration of the cutting process is reduced, the geometric shapes of the first welding electrode welding surface and the second welding electrode welding surface are stably cut and restored, and the service life of the cutting tool is prolonged.

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