CN213104529U

CN213104529U - Grinding blade of welding electrode

Info

Publication number: CN213104529U
Application number: CN202021530647.2U
Authority: CN
Inventors: 王艳俊; 李铭锋; 杨上陆
Original assignee: Shanghai Zhongke Shenguang Photoelectric Industry Co ltd; Shanghai Institute of Optics and Fine Mechanics of CAS
Current assignee: Shanghai Zhongke Shenguang Photoelectric Industry Co ltd; Shanghai Institute of Optics and Fine Mechanics of CAS
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2021-05-04
Anticipated expiration: 2030-07-29

Abstract

A coping blade of a welding electrode has a structure which is symmetrical by taking a central rotating central shaft, and comprises a front cutter face, a chip removal face and two cutting grooves which are opposite up and down; the sharpening blade carries out clockwise rotation cutting motion around a rotation central shaft, and the cutting groove grinds the welding surface of the welding electrode extending into the cutting groove into a specific size shape. The invention optimizes the structural parameters of the cutter, achieves the effects of smooth chip removal, reduction of friction and vibration, improvement of cutting quality and prolongation of the service life of the cutter, and can adapt to the grinding requirements of welding surfaces with various sizes and shapes.

Description

Grinding blade of welding electrode

Technical Field

The utility model relates to a restoration of resistance welding equipment specifically relates to a welding electrode's coping blade, belongs to mechanical technical field.

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 sharpening blade installed on a sharpening machine after a certain number of welding operations (such as 1000-1200 welding points) are completed, and a remolded welding surface is restored to the original shape. 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 improve the repair quality of a sharpening blade, ensure the operation efficiency of a welding production line and prolong the service life of a welding electrode, the electrode head of the existing spot welding machine usually adopts a replaceable wearing part structure, namely a detachable electrode cap is sleeved at the end part of an electrode rod. When the welding surface is damaged, the new electrode cap can be quickly replaced, the production rhythm is timely recovered, the worn electrode caps can be intensively repaired, and offline grinding is realized.

The technical scheme of the utility model is applicable to restoration between integral welding electrode and the electrode cap that can load and unload equally.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a welding electrode's coping blade and coping method is provided, realize welding electrode's cutting and recover, can reduce the vibration in the cutting process more effectively than prior art, get rid of the sweeps more quickly, reach the effect that promotes cutting quality and extension welding electrode working life.

Based on the above-mentioned purpose, the utility model discloses the technical scheme who takes as follows:

the grinding blade comprises a support type main body, wherein the support type main body is of a structure which is symmetrical about a central rotating shaft with the center along the vertical direction, a first front cutter face and a second chip removal face are arranged on the vertical face of one side of the support type main body, a second front cutter face and a first chip removal face are arranged on the vertical face of the other side of the support type main body, and a first cutting groove is formed in the upper part of the support type main body;

the first cutting groove comprises a first cutting surface, a second cutting surface and two third cutting surfaces which are positioned on the upper side surface of the support-type main body, a first cutting edge formed by the intersection of the first cutting surface and the first rake surface, a second cutting edge formed by the intersection of the second cutting surface and the second rake surface and a first chisel edge formed by the intersection of the two third cutting surfaces;

the first chisel edge is connected between the first cutting edge and the second cutting edge and intersects the rotation central axis at the midpoint of the first chisel edge, the first cutting edge, the second cutting edge and the first chisel edge are positioned at the most convex positions in the first cutting groove and directly cut the welding electrode, and the development curve of the cutting edge on the vertical surface is symmetrical about the rotation central axis and corresponds to the size and shape of a welding surface required by the repaired welding electrode;

the first cutting surface and the second cutting surface are inwards inclined and have a back angle with the cutting plane, the two third cutting surfaces are inwards inclined and have an inclination angle, and a first chip groove and a second chip groove are respectively arranged at the intersection of the two third cutting surfaces and the support type main body;

the holder-type body performs a rotary cutting motion around the rotation center axis in a clockwise direction, the welding electrode extends into the first cutting groove, and the first cutting edge, the second cutting edge, and the first chisel edge grind a welding surface of the welding electrode into a specific size shape.

Preferably, a second cutting groove is formed in the lower portion of the pedestal-type body, has a symmetrical structure same as that of the first cutting groove, and comprises a third cutting edge, a fourth cutting edge, a second chisel edge, a fourth cutting edge, a fifth cutting surface, a sixth cutting surface, a third flute and a fourth flute which correspond to the first cutting edge, the second cutting edge, the first chisel edge, the first cutting surface, the second cutting surface, the third cutting surface, the first flute and the second flute respectively; when the support type main body rotates clockwise around the rotating central shaft to perform cutting motion, the welding electrode extends into the second cutting groove, the third cutting edge, the fourth cutting edge and the second chisel edge directly cut the welding electrode, and the welding surface of the welding electrode is ground into a specific size shape.

Preferably, the second cutting flutes are identical in structure, size and shape to the first cutting flutes in mirror image perfect symmetry about the horizontal plane.

Preferably, the projection lines of the first cutting edge and the second cutting edge in the horizontal projection plane are parallel to each other, and the first chisel edge forms a chisel edge oblique angle with the first cutting edge and the second cutting edge.

Preferably, the distance between the projection lines of the first cutting edge and the second cutting edge in the horizontal projection plane is 0.01-2 mm, preferably 0.05-1.5 mm.

Preferably, the first chisel edge and the projection line of the first cutting edge and the second cutting edge in the horizontal projection plane form a chisel edge oblique angle of 15-150 degrees, preferably 30-90 degrees.

Preferably, the clearance angle of the first cutting surface and the second cutting surface is 1-20 degrees, and preferably 3-15 degrees.

Preferably, the inclination angle of the third cutting surface is the same as the value of the clearance angle of the first cutting surface and the second cutting surface.

Preferably, the first cutting edge and the second cutting edge are respectively provided with a first forming groove and a second forming groove.

Preferably, the first cutting surface and the second cutting surface are respectively provided with a first chip breaker groove and a second chip breaker groove.

Preferably, the depth of the first chip breaker and the second chip breaker is 0.01-1 mm.

The utility model discloses a another technical scheme does:

the method for grinding the welding electrode by adopting the grinding blade comprises the following steps:

1) grinding the first cutting edge, the second cutting edge and the first chisel edge of the first cutting groove and the third cutting edge, the fourth cutting edge and the second chisel edge of the second cutting groove into preset shapes according to requirements, and finishing the preparation of the sharpening blade;

2) embedding the sharpening blade into a hollow cutter holder to form a sharpening cutter, installing the sharpening cutter on a sharpening machine, connecting an upper welding electrode and a lower welding electrode of the welding electrode to a welding gun, and moving the sharpening blade between the upper welding electrode and the lower welding electrode which are opposite to each other without applying current;

3) starting the sharpening machine, and driving the sharpening blade to rotate clockwise through the cutter holder;

4) the upper welding electrode and the lower welding electrode respectively enter the first cutting groove and the second cutting groove by applying pressure, the rotating grinding blade simultaneously and respectively cuts and trims the welding surface of the upper welding electrode and the welding surface of the lower welding electrode, and finally the welding surface is restored to the geometrical shape of the required welding surface, and the used pressure and time are determined according to the material and the shape structure of the welding electrode;

in the cutting process, the sweeps that first cutting edge and third cutting edge produced via the second chip surface discharges, the sweeps that second cutting edge and fourth cutting edge produced via first chip surface discharges, the sweeps that first chisel edge produced via both sides respectively second chip surface and first chip surface discharges, the sweeps that second chisel edge produced via both sides respectively fourth chip surface and second chip surface and third chip surface discharges.

Preferably, in the step 4), the pressure is 400-3000N, preferably 500-2000N; the cutting time is 500-5000 ms, preferably 1000-3500 ms.

Compared with the prior art, the utility model discloses optimize the structural parameter of cutter, gained following effect:

1. the cutting edge composed of the first cutting edge, the second cutting edge and the first chisel edge can be ground into curves with various geometric characteristics, so that the grinding requirements of welding surfaces with various sizes and shapes can be met.

2. The first cutting surface and the second cutting surface are provided with back angles, and the third cutting surface is provided with an inclination angle, so that the friction between chips and a processed welding surface is greatly reduced, the vibration in the cutting process is reduced, and the grinding quality of a welding electrode is ensured.

3. The arrangement of the first chip removal surface, the second chip removal surface, the first chip removal groove and the second chip removal groove ensures that the chips removed by the chisel edge can be smoothly removed in the cutting process without accumulation, thereby improving the cutting quality.

4. The cutting surface is provided with the plurality of chip breakers, so that the cutting edge is disconnected, the width of chips can be narrowed in the cutting process, the chips are easily discharged from the chip breakers, the blockage phenomenon can not occur, the grinding quality of the welding surface is improved, and the service life of the cutter is further prolonged.

5. Through increasing the third cutting surface and the chisel edge forming an angle with the first cutting edge and the second cutting edge, scraps generated by cutting at the center of the cutter can be effectively discharged, the vibration generation in the grinding process and the grinding quality of a welding surface are reduced, and the service life of the cutter is further prolonged.

Drawings

Fig. 1 is a perspective structural view of a first embodiment of 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 sectional view of section a-a in fig. 3.

Fig. 5 is an enlarged view of a central portion of fig. 3.

FIG. 6 is a schematic view of a cutting motion according to an embodiment.

FIG. 7 is a schematic view of a cutting edge development curve according to an embodiment.

Fig. 8 is a schematic view illustrating a thinning state according to an embodiment.

Fig. 9 is a schematic view of a thinning state according to the second embodiment.

Fig. 10 is a perspective view of a third embodiment of the present invention.

Fig. 11 is an X-direction (front) view in fig. 10.

Fig. 12 is an enlarged view of a central portion of fig. 10.

Fig. 13 is a schematic view of a thinning state according to the third embodiment.

In the figure: 1-a pedestal-type body, 2-a first cutting flute, 2 a-a second trailing edge, 2 b-a first trailing edge, 21-a first cutting face, 22-a third cutting face, 23-a second cutting face, 24-a first cutting edge, 241-a first forming groove, 25-a second cutting edge, 251-a second forming groove, 26-a first chisel edge, 27-a first chip flute, 28-a second chip flute, 3-a second cutting flute, 31-a fourth cutting face, 33-a fifth cutting face, 34-a third cutting edge, 35-a fourth cutting edge, 36-a second chisel edge, 37-a third chip flute, 4-a second chip flute, 5-a first chip flute, 6-a first chip flute, 7-a second chip flute, 81-a first rake face, 82-a second rake face, 91-an upper welding electrode, 92-a lower welding electrode, a-a spacing of the first cutting edge from the second cutting edge, OO',alpha-the back angle of the cylinder,

-chisel edge bevel angle.

Detailed Description

The following describes the tip and method of the welding electrode in 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 device 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, the positional relationship such as "horizontal", "vertical", "longitudinal", "lateral", "vertical", "up", "down", "clockwise", "counterclockwise", "outer" and "inner" is relative to the main structure of the sharpening blade of the present invention.

It is understood that within the scope of the present invention, the above-mentioned technical features of the present description may be combined with the technical features specifically described below (e.g., examples) to form new or preferred technical solutions. Not to be reiterated herein, but to the extent of space.

Example one

The embodiment discloses a sharpening blade which can simultaneously cut and restore the welding surfaces of two welding electrodes which are opposite up and down and suffer different damage degrees. The grinding blade can simultaneously and respectively cut and finish the welding surfaces of the upper welding electrode and the lower welding electrode, so that the electrode cap with the welding surface having specific geometric characteristics can be ground, and the integral welding electrode with the welding surface having the specific geometric characteristics can be recovered. The dressing of the welding electrode can be repeated as many times as possible until the weld surface no longer supports the dressing due to material loss.

As shown in fig. 1, 2 and 3, the sharpening blade is of an integral structure and is provided with an i-shaped support type main body 1; the holder-type body 1 is composed of a cutting portion in the middle and mounting portions at both ends, the cutting portion is fixedly sandwiched between the mounting portions at both ends, and the holder-type body 1 has a rotation center axis OO' in the vertical direction (Z axis) at the center. The cutting part comprises a first cutting groove 2 and a second cutting groove 3 which are opposite up and down, the first cutting groove 2 and the second cutting groove 3 are used for cutting the welding electrode, the two cutting grooves have the same structural shape and size, and are arranged in a mirror symmetry mode relative to a horizontal plane PP'. One side facade of cutting portion is equipped with first rake face 81 and the second chip surface 4 along vertical direction (Z axle), and the opposite side facade is equipped with second rake face 82 and the first chip surface 5 along vertical direction (Z axle), first rake face 81 and second chip surface 4 about rotation center axle OO' respectively with second rake face 82 and first chip surface 5 are symmetrical arrangement. When dressing the welding electrode, the dressing blade performs a clockwise rotational cutting movement (viewed in the Z direction in fig. 1) about the central axis of rotation OO', see fig. 6; the following "front" and "rear" are based on the advancing direction of the rotary cutting motion.

It should be noted that, although the pedestal-type main body 1 is i-shaped in the embodiment, it is not limited to this, and it may be other similar modifications, including a threaded hole, a through hole, and a step or a protrusion, a recess, etc. which may be partially disposed therein for connecting with an external mounting member.

Since the first cutting flutes 2 and the second cutting flutes 3 are symmetrically identical in shape, the present embodiment focuses on the structural features of the first cutting flutes 2.

The first cutting flute 2 includes a first cutting surface 21 and a second cutting surface 23 on an upper side of the cutting portion, and the first cutting surface 21 and the second cutting surface 23 are symmetrically arranged with respect to the rotation center axis OO'. The first cutting surface 21 intersects the first rake surface 81 with the intersection forming the first cutting edge 24 and the first chip surface 5 with the intersection forming the first trailing edge 2 b. The second cutting surface 23 intersects the second rake surface 82, the intersection of which forms a second cutting edge 25; intersects said second chip surface 4, the intersection of which forms a second rear edge 2 a. The first cutting edge 24 and the first trailing edge 2b are arranged symmetrically to the second cutting edge 25 and the second trailing edge 2a, respectively, about the central axis of rotation OO'.

As shown in fig. 4, the first cutting surface 21 between the first rear edge 2b and the first cutting edge 24 is gradually inclined inward from the first cutting edge 24 such that the first rear edge 2b is lower than the first cutting edge 24, thereby forming a clearance angle α with the cutting plane. Likewise, the second cutting surface 23 is gradually inclined inwardly from the second cutting edge 25 such that the second trailing edge 2a is lower than the second cutting edge 25, thereby forming a relief angle. The relief angle α serves to substantially reduce friction between the first cutting surface 21 and the machined weld surface when cutting the welding electrode, and is generally 1 to 20 °, preferably 3 to 15 °.

Referring to fig. 1, 3 and 5, the first cutting edge 24 and the second cutting edge 25 are connected by a first chisel edge 26, the first chisel edge 26 intersects the rotation center axis OO 'at a midpoint of the first chisel edge 26, and the shape and size of both sides of the first chisel edge 26 are symmetrical to the rotation center axis OO'. The cutting edge development curves of the first cutting edge 24, the second cutting edge 25 and the first chisel edge 26 on the vertical plane are shown in fig. 7, and the first cutting edge 24 and the second cutting edge 25 are in the vertical directionThe cutting edges have the same height in the Z axis direction, and the whole cutting edge development curve is symmetrical by the central rotation axis OO'; coping blade can adapt to the coping of multiple geometric characteristics's face of weld, cutting edge expansion curve has specific geometric shape, and is corresponding with the required face of weld size shape of the welding electrode of coping. The first cutting edge 24, the second cutting edge 25 and the first chisel edge 26 are in the most protruding position in the first cutting flute 2, which directly cuts the welding electrode. Viewed in the Z direction in fig. 1, as shown in fig. 5, the projection line of the first cutting edge 24 and the projection line of the second cutting edge 25 are parallel to each other in a horizontal projection plane, and the distance a therebetween is generally 0.01 to 2mm, preferably 0.05 to 1.5 mm. The first chisel edge 26 forms a chisel edge bevel with the first cutting edge 24 and the second cutting edge 25

Typically, the chisel edge bevel

From 15 to 150, preferably from 30 to 90.

As shown in fig. 5, third cutting surfaces 22 are formed downward on both sides of the first chisel edge 26, and the inclination angle of the third cutting surfaces 22 functions similarly to the relief angle α, but may have the same value as the relief angle α or may have a different value. The third cutting surfaces 22 on both sides are respectively provided with a first chip groove 27 and a second chip groove 28 at the intersection with the support-type main body 1, the first chip groove 27 and the second chip groove 28 are obviously lower than the third cutting surface 22, and the function of the chip groove is to enable the chips cut by the first chisel edge 26 to be smoothly removed in the cutting process without accumulation.

The surfaces of all cutting surfaces, rake surfaces, chip removal surfaces and chip grooves on the sharpening blade are generally provided with anti-abrasion coating layers.

The second cutting groove 3 is positioned at the lower part of the cutting part and is symmetrical to the first cutting groove 2; referring to FIG. 2, the second cutting flute 3 includes a fourth cutting surface 31 intersecting the first rake surface 81A third cutting edge 34 formed by intersecting the fifth cutting surface 33 and the second rake surface 82, a fourth cutting edge 35 formed by intersecting the fifth cutting surface 33 and the second rake surface 82, and a second chisel edge 36 formed by intersecting the two sixth cutting surfaces; the fourth cutting face 31 and the fifth cutting face 33 have a relief angle α, and the sixth cutting face has an inclination angle; the second chisel edge 36 is connected between the third cutting edge 34 and the fourth cutting edge 35, the projection lines of the third cutting edge 34 and the fourth cutting edge 35 in the horizontal projection plane are parallel to each other and are spaced from each other by a distance a, and the second chisel edge 36, the third cutting edge 34 and the fourth cutting edge 35 form a chisel edge bevel angle

The second chisel edge 36 intersects the rotation center axis OO 'at a midpoint of the second chisel edge 36, and the third cutting edge 34, the fourth cutting edge 35, and the second chisel edge 36 are positioned at the most protruding positions in the second cutting flute 3, and directly cut the lower welding electrode, and a cutting edge development curve on a vertical surface is symmetrical with the rotation center axis OO', and corresponds to a welding surface size and shape required by the ground lower welding electrode. The intersections of the two sixth cutting surfaces and the support-type main body 1 are respectively provided with a third chip groove 37 and a fourth chip groove which are lower than the sixth cutting surfaces.

The third cutting edge 34, the fourth cutting edge 35, the second chisel edge 36, the fourth cutting surface 31, the fifth cutting surface 33, the sixth cutting surface, the third flute 37 and the fourth flute are arranged mirror-symmetrically with respect to the horizontal plane PP' with respect to the first cutting edge 24, the second cutting edge 25, the first chisel edge 26, the first cutting surface 21, the second cutting surface 23, the third cutting surface 22, the first flute 27 and the second flute 28, respectively, of the first cutting flute 2.

When the sharpening blade is used to cut and repair a welding electrode or an electrode cap, see fig. 6, the holder-type body 1 is rotated around the rotation central axis OO' in a clockwise direction (as viewed from the direction Z in fig. 1) as shown in the drawing, and then the upper and lower welding electrodes (electrode caps) are respectively inserted into the first cutting groove 2 and the second cutting groove 3 by applying a certain pressure, so that the welding surfaces of the upper and lower welding electrodes (electrode caps) are respectively ground into a desired geometric shape by the first cutting edge 24, the second cutting edge 25, the first chisel edge 26, the third cutting edge 34, the fourth cutting edge 35, and the second chisel edge 36. The method comprises the following specific steps:

1) preparing the thinning insert, and grinding the first cutting edge 24, the second cutting edge 25 and the first chisel edge 26 of the first cutting flute 2 and the third cutting edge 34, the fourth cutting edge 35 and the second chisel edge 36 of the second cutting flute 3 into a predetermined shape as required;

2) embedding the support type main body 1 into a hollow cutter holder with polygonal or circular periphery through mounting parts at two ends to form a sharpening cutter, mounting the sharpening cutter on a sharpening machine, connecting an upper welding electrode 91 and a lower welding electrode 92 to a C-shaped welding gun or an X-shaped welding gun, and moving a sharpening blade between the upper welding electrode 91 and the lower welding electrode 92 which are opposite to each other without applying current;

3) starting a motor of the sharpening machine to drive the sharpening blade to rotate clockwise through the cutter holder, as shown in figure 6;

4) applying pressure to the welding torch to cause the upper welding electrode 91 to enter the first cutting groove 2 and the lower welding electrode 92 to enter the second cutting groove 3, see fig. 8, and the rotating holder-type body 1 simultaneously cuts and trims the welding surface of the upper welding electrode 91 and the welding surface of the lower welding electrode 92 by the first cutting edge 24, the second cutting edge 25, and the first chisel edge 26, and the third cutting edge 34, the fourth cutting edge 35, and the second chisel edge 36, respectively, to finally restore the desired geometries of the welding surfaces of the upper welding electrode 91 and the lower welding electrode 92;

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 sweeps that first cutting edge 24 and third cutting edge 34 produced via the coping cutter of 4 discharges of second chip discharge face, the sweeps that second cutting edge 25 and fourth cutting edge 35 produced via the coping cutter of 5 discharges of first chip discharge face, the sweeps that first chisel edge 26 produced via from both sides respectively second chip discharge groove 28 and second chip discharge face 4 and the coping cutter of 5 discharges of first chip discharge groove 27 and first chip discharge face, the sweeps that second chisel edge 36 produced via from both sides respectively fourth chip discharge groove and second chip discharge face 4 and the coping cutter of 5 discharges of third chip discharge groove 37 and first chip discharge face.

Example two

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 2 and the second cutting flutes 3 are no longer arranged symmetrically about the central axis of rotation OO'.

In the present embodiment, the first cutting flute 2 has a similar structure to the second cutting flute 3, but the size and shape of the third cutting edge 34, the fourth cutting edge 35 and the second chisel edge 36 are different from the size and shape of the first cutting edge 24, the second cutting edge 25 and the first chisel edge 26, 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. 9.

EXAMPLE III

The third embodiment is basically the same as the first embodiment, except that the cutting edge is provided with a forming groove and the cutting surface is provided with a chip breaker.

Referring to fig. 10, 11 and 12 in combination, the sharpening blade is illustrated as having a holder-type body composed of a cutting portion at the center and mounting portions at both ends, and having a rotation center axis OO' at the center in a vertical direction. One side facade of the cutting part is provided with a first rake surface 81 and a second chip removal surface 4, the other side facade is provided with a second rake surface 82 and a first chip removal surface 5, and the cutting part comprises a first cutting groove 2 and a second cutting groove 3 which are opposite up and down.

The first cutting flute 2 comprises a first cutting surface 21, a second cutting surface 23 and two third cutting surfaces which are positioned at the upper side of the cutting part, and the first cutting surface 21 and the first front cutting surfaceA first cutting edge 24 formed by intersecting the rake face 81, a second cutting edge 25 formed by intersecting the second cutting face 23 and the second rake face 82, and a first chisel edge 26 formed by intersecting both third cutting faces. The first and second cutting faces 21 and 23 are inclined inwardly with a clearance angle to the cutting plane; the first cutting surface 21 and the second cutting surface 23 are respectively provided with one or more first chip breakers 6 and second chip breakers 7, so that the cutting edges of the first cutting edge 24 and the second cutting edge 25 are disconnected, the width of chips can be narrowed in the cutting process, the chips are easily discharged from the chip breakers, and the blocking phenomenon cannot occur; the depth of the first chip breaker 6 and the second chip breaker 7 is generally 0.01-1 mm. The two third cutting surfaces are positioned in the middle of the first cutting groove 2 and both have inclination angles, and a first chip groove and a second chip groove are respectively arranged at the intersection of the two third cutting surfaces and the support type main body. The first cutting edge 24 and the second cutting edge 25 are respectively provided with a first forming groove 241 and a second forming groove 251, see fig. 12, so that an annular boss is cut on the welding surface of the welding electrode during cutting. The first chisel edge 26 is connected between the first cutting edge 24 and the second cutting edge 25, and the first chisel edge 26 intersects the rotation center axis OO' at a midpoint of the first chisel edge 26 and has a convex circular arc shape; the first cutting edge 24, the second cutting edge 25 and the first chisel edge 26 are located at the most protruded positions in the first cutting groove 2, and directly cut the welding electrode, and the development curve of the cutting edge on the vertical surface is symmetrical to the rotation center axis OO' and corresponds to the size and shape of the welding surface required by the repaired welding electrode. The projection lines of the first cutting edge 24 and the second cutting edge 25 in the horizontal projection plane are parallel to each other and are spaced from each other by a distance a (see fig. 12), and the distance a is 0.01-2 mm, preferably 0.05-1.5 mm. The first chisel edge 26 forms a chisel edge bevel with the first cutting edge 24 and the second cutting edge 25

The chisel edge bevel angle

From 15 degrees to 90 degrees, preferably from 30 degrees to 90 degrees.

The first chisel edge 26 has a symmetrical shape and size about the central axis of rotation OO'. The position shapes of the two third cutting surfaces are also symmetrical about the rotation center axis OO'. The first rake surface 81, the second chip surface 4, the first cutting surface 21, the first cutting edge 24, the first forming groove 241 and the first chip groove are symmetrically arranged with respect to the rotation center axis OO' and the second rake surface 82, the first chip surface 5, the second cutting surface 23, the second cutting edge 25, the second forming groove 251 and the second chip groove, respectively.

The second cutting flutes 3 are located in the lower part of the cutting portion and are arranged mirror-symmetrically to the first cutting flutes 2 with respect to the horizontal plane.

When the grinding insert of the third embodiment is used to cut and repair a welding electrode or an electrode cap, referring to fig. 13, the holder-type body 1 rotates around the rotation central axis OO' in a clockwise direction (as viewed from the direction Z in fig. 1), and then the upper welding electrode 91 and the lower welding electrode 92 are respectively inserted into the first cutting groove 2 and the second cutting groove 3 by applying a certain pressure, so that the outer side surfaces of the welding surfaces of the upper welding electrode (electrode cap) and the lower welding electrode (electrode cap) are ground into annular convex rings by the first cutting edge 24 and the second cutting edge 25 of the first cutting groove 2 and the third cutting edge 34 and the fourth cutting edge 35 of the second cutting groove 3, respectively; the first chisel edge 26 and the second chisel edge 36 respectively grind the centers of the welding surfaces of the upper and lower welding electrodes (electrode caps) into arc shapes having recesses.

In the utility model, the coping blade can be made of various materials which can be used for manufacturing cutters, including various alloy tool steels, high-speed tool steels, hard alloys, ceramic alloys and the like; it may be subjected to various heat treatment processes including bulk quenching, case quenching, carburizing, nitriding, carbonitriding, and the like. The sharpening blade is shaped as a whole, for example by casting, sintering, or by machining, cutting, grinding, etc., 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 be subject to aging 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 after reading the above description of the present invention, various changes or modifications may be made to the present invention by those skilled in the art, and such equivalents may also fall within the scope of the invention as defined by the appended claims.

Claims

1. A coping blade of welding electrode which characterized in that: the sharpening blade comprises a support type main body, the support type main body is of a structure which is symmetrical by taking a central rotating central shaft in the vertical direction at the center, a first front cutter face and a second chip removal face are arranged on the vertical face of one side of the support type main body, a second front cutter face and a first chip removal face are arranged on the vertical face of the other side of the support type main body, and a first cutting groove is arranged at the upper part of the support type main body;

the support type main body performs rotary cutting motion around the rotary central shaft in the clockwise direction, the welding electrode extends into the first cutting groove, and the size and the shape of the welding surface of the welding electrode are polished by the first cutting edge, the second cutting edge and the first chisel edge.

2. The sharpening blade for welding electrodes according to claim 1, characterized in that: the lower part of the support-type main body is provided with a second cutting groove, the structure of the second cutting groove is symmetrical and same as that of the first cutting groove, and the second cutting groove comprises a third cutting edge, a fourth cutting edge, a second chisel edge, a fourth cutting surface, a fifth cutting surface, a sixth cutting surface, a third chip groove and a fourth chip groove which correspond to the first cutting edge, the second cutting edge, the first chisel edge, the first cutting surface, the second cutting surface, the third cutting surface, the first chip groove and the second chip groove respectively; when the support type main body rotates clockwise around the rotating central shaft to perform cutting motion, the welding electrode extends into the second cutting groove, the third cutting edge, the fourth cutting edge and the second chisel edge directly cut the welding electrode, and the size and the shape of the welding surface of the welding electrode are polished.

3. The sharpening blade for welding electrodes according to claim 2, characterized in that: the second cutting flutes are identical in structure, size and shape to the first cutting flutes in mirror image perfect symmetry about a horizontal plane.

4. The sharpening blade for welding electrodes according to claim 1, characterized in that: the projection lines of the first cutting edge and the second cutting edge in the horizontal projection plane are parallel to each other, and the first chisel edge forms a chisel edge oblique angle with the first cutting edge and the second cutting edge.

5. The repair tip for welding electrodes according to claim 4, characterized in that: the distance between the projection lines of the first cutting edge and the second cutting edge in the horizontal projection plane is 0.01-2 mm.

6. The repair tip for welding electrodes according to claim 4, characterized in that: the chisel edge oblique angle formed by the projection lines of the first chisel edge, the first cutting edge and the second cutting edge in the horizontal projection plane is 15-150 degrees.

7. The sharpening blade for welding electrodes according to claim 1, characterized in that: the back angle of the first cutting surface and the back angle of the second cutting surface are 1-20 degrees.

8. Sharpening blade for welding electrodes according to claim 1 or 7, characterized in that: the inclination angle of the third cutting surface is the same as the value of the clearance angle of the first cutting surface and the second cutting surface.

9. The sharpening blade for welding electrodes according to claim 1, characterized in that: the first cutting edge and the second cutting edge are respectively provided with a first forming groove and a second forming groove.

10. The sharpening blade for welding electrodes according to claim 1, characterized in that: and the first cutting surface and the second cutting surface are respectively provided with a first chip breaker groove and a second chip breaker groove.

11. The repair tip for welding electrodes according to claim 10, characterized in that: the depth of the first chip breaker and the second chip breaker is 0.01-1 mm.