A grinding blade and grinding method for a welding electrode

Abstract

A grinding blade for a welding electrode, having a structure symmetric about a central rotation axis, includes a rake face, a chip fluting face, and two cutting grooves opposite to each other vertically; the cutting grooves include two cutting faces, two third cutting faces, two cutting edges, and a transverse edge. Among them, the two cutting faces have a relief angle inclined inwards, the two third cutting faces have an inclination angle inwards, the two third cutting faces are respectively connected with chip removal grooves, the transverse edge is connected between the two cutting edges, intersects with the rotation axis at the midpoint of the transverse edge, and the two cutting edges and the transverse edge are in the most protruding positions in the cutting grooves to directly cut the welding electrode. The developed curve of its cutting edge is symmetric about the rotation axis and corresponds to the size and shape of the ground welding surface; the grinding blade rotates clockwise around the rotation axis for cutting movement, and the cutting grooves grind the welding surface of the inserted welding electrode into a specific size and shape. The present invention optimizes the structural parameters of the tool, achieving the effects of smooth chip removal, reducing friction and vibration, improving cutting quality, and extending the working life of the tool, and can meet the grinding requirements of welding surfaces of various sizes and shapes.

Description

Technical Field

[0001] The present invention relates to the repair of resistance welding equipment, and particularly to a grinding blade for welding electrodes and a grinding method, belonging to the field of mechanical technology. Background Art

[0002] Resistance spot welding is a method of sandwiching two or more layers of overlapping workpieces between opposite upper and lower welding electrodes, applying pressure and passing current while in contact, and using the resistance between the workpieces to generate heat to melt the material to achieve workpiece connection. The resistance spot welding method is generally used for the laminated 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, etc. This method has currently become the main manufacturing process in the production of automotive steel bodies. During continuous production operations, after repeated spot welding operations, under the action of mechanical pressure and current, the welding surface at the front end of the welding electrode will undergo varying degrees of wear and aging. This is mainly because the temperature of the electrode welding surface increases during welding, resulting in local plastic deformation, and adhesion occurs between the electrode and the workpiece material, causing the accumulation of contaminants. The aging and shape change of the welding electrode will cause a decline in subsequent welding quality and defects on the workpiece surface. Therefore, it is very important to regularly restore the welding surface of the welding electrode to its original size and shape. At the same time, in order not to interrupt the manufacturing rhythm on the production line, it is necessary to ensure the rapid and accurate restoration of the welding electrode.

[0003] Currently, the general method for repairing welding electrodes is that after a certain number of welding operations (such as 1000 - 1200 welds), a grinding blade installed on a grinding machine is used to cut the end of the welding electrode to reshape the welding surface to its original state. The key to ensuring the effective restoration of the welding electrode is that the waste chips generated by the grinding blade during the cutting process can be effectively removed without causing blockage, which will lead to a decline in the cutting ability of the grinding blade, vibration during the cutting process, and a reduction in the service life of the grinding blade. Therefore, optimizing the structural shape and dimensional parameters of the grinding blade becomes a crucial issue.

[0004] In order to improve the repair quality of the grinding blade, ensure the operation efficiency of the welding production line, and extend the working life of the welding electrode, currently, the electrode head of a spot welder usually adopts a replaceable vulnerable part structure, that is, a detachable electrode cap is sleeved at the end of the electrode rod. When the welding surface is damaged, a new electrode cap can be quickly replaced to promptly resume the production rhythm, and the worn electrode caps can be concentrated for repair operations to achieve off-line grinding.

[0005] The technical solution of the present invention is equally applicable to the repair of both integral welding electrodes and detachable electrode caps. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a grinding blade and a grinding method for welding electrodes, so as to realize the cutting and restoration of welding electrodes, reduce the vibration during cutting more effectively than the prior art, discharge waste chips faster, and achieve the effects of improving the cutting quality and prolonging the working life of welding electrodes.

[0007] Based on the above object, the technical solution adopted by the present invention is as follows:

[0008] Provide a grinding blade for welding electrodes, including a support-type main body, which has a structure symmetric about the rotation center axis along the vertical direction in the center. One side elevation of the support-type main body is provided with a first rake face and a second chip removal face, and the other side elevation is provided with a second rake face and a first chip removal face. The upper part is provided with a first cutting groove;

[0009] The first cutting groove includes a first cutting face, a second cutting face, and two third cutting faces located on the upper side face of the support-type main body, a first cutting edge formed by the intersection of the first cutting face and the first rake face, a second cutting edge formed by the intersection of the second cutting face and the second rake face, and a first transverse edge formed by the intersection of the two third cutting faces;

[0010] The first transverse edge is connected between the first cutting edge and the second cutting edge, intersects with the rotation center axis at the midpoint of the first transverse edge. The first cutting edge, the second cutting edge, and the first transverse edge are in the most protruding positions in the first cutting groove, directly cutting the welding electrode. The cutting edge development curve on the elevation is symmetric about the rotation center axis and corresponds to the size and shape of the welding surface required for the grinding of the welding electrode;

[0011] The first cutting face and the second cutting face are inclined inward, having a clearance angle with the cutting plane. The two third cutting faces are inclined inward, having an inclination angle. First chip removal grooves and second chip removal grooves are respectively provided at the intersections of the two third cutting faces and the support-type main body;

[0012] The support-type main body rotates and cuts along the clockwise direction around the rotation center axis. The welding electrode extends into the first cutting groove, and the first cutting edge, the second cutting edge, and the first transverse edge grind the welding surface of the welding electrode into a specific size and shape.

[0013] Preferably, a second cutting groove is provided at the lower part of the support - type main body. The structure of the second cutting groove is symmetrically identical to that of the first cutting groove, and includes a third cutting edge, a fourth cutting edge, a second transverse edge, a fourth cutting surface, a fifth cutting surface, a sixth cutting surface, a third chip - discharging groove, and a fourth chip - discharging groove, which respectively correspond to the first cutting edge, the second cutting edge, the first transverse edge, the first cutting surface, the second cutting surface, the third cutting surface, the first chip - discharging groove, and the second chip - discharging groove. When the support - type main body rotates clockwise around the rotation center axis for cutting movement, the welding electrode extends into the second cutting groove, and the third cutting edge, the fourth cutting edge, and the second transverse edge directly cut the welding electrode to grind the welding surface of the welding electrode into a specific size and shape.

[0014] Preferably, the structure, size, and shape of the second cutting groove are completely mirror - symmetric with respect to the horizontal plane and the first cutting groove.

[0015] 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 transverse edge forms a transverse edge bevel angle with the first cutting edge and the second cutting edge.

[0016] 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.

[0017] Preferably, the transverse edge bevel angle formed by the first transverse edge and the projection lines of the first cutting edge and the second cutting edge in the horizontal projection plane is 15 - 150°, preferably 30 - 90°.

[0018] Preferably, the clearance angles of the first cutting surface and the second cutting surface are 1 - 20°, preferably 3 - 15°.

[0019] Preferably, the inclination angle of the third cutting surface has the same value as the clearance angles of the first cutting surface and the second cutting surface.

[0020] Preferably, a first forming groove and a second forming groove are respectively provided on the first cutting edge and the second cutting edge.

[0021] Preferably, a first chip - breaking groove and a second chip - breaking groove are respectively provided on the first cutting surface and the second cutting surface.

[0022] Preferably, the depths of the first chip - breaking groove and the second chip - breaking groove are 0.01 - 1 mm.

[0023] Another technical solution of the present invention is:

[0024] Provide a grinding method for a welding electrode using the above - mentioned grinding blade, which includes the following steps:

[0025] 1) Grind the first cutting edge, the second cutting edge, and the first transverse edge of the first cutting groove, as well as the third cutting edge, the fourth cutting edge, and the second transverse edge of the second cutting groove into a predetermined shape to complete the preparation of the grinding blade.

[0026] 2) Insert the grinding blade into the hollow tool holder to form a grinding tool, and install it on the grinding machine. Connect the upper welding electrode and the lower welding electrode of the welding electrode to the welding torch, but do not apply current. Place the grinding blade between the opposing upper welding electrode and lower welding electrode.

[0027] 3) Start the grinding machine and drive the grinding blade to rotate clockwise through the tool holder.

[0028] 4) By applying pressure, the upper welding electrode and the lower welding electrode are respectively inserted into the first cutting groove and the second cutting groove. The rotating grinding blade simultaneously cuts and trims the welding surfaces of the upper welding electrode and the lower welding electrode, and finally restores to the geometric shape of the required welding surface. The pressure and time used are determined according to the material and shape structure of the welding electrode.

[0029] During the cutting process, the waste chips generated by the first cutting edge and the third cutting edge are discharged through the second chip removal surface. The waste chips generated by the second cutting edge and the fourth cutting edge are discharged through the first chip removal surface. The waste chips generated by the first transverse edge are discharged from both sides through the second chip outlet groove and the second chip removal surface, as well as the first chip outlet groove and the first chip removal surface. The waste chips generated by the second transverse edge are discharged from both sides through the fourth chip outlet groove and the second chip removal surface, as well as the third chip outlet groove and the first chip removal surface.

[0030] Preferably, in step 4), the pressure is 400 - 3000 N, preferably 500 - 2000 N; the cutting time is 500 - 5000 ms, preferably 1000 - 3500 ms.

[0031] Compared with the traditional technology, the present invention optimizes the structural parameters of the tool and achieves the following effects:

[0032] 1. The cutting edge composed of the first cutting edge, the second cutting edge, and the first transverse edge can be ground into curves with various geometric features, so as to meet the grinding requirements of welding surfaces of various sizes and shapes.

[0033] 2. The first cutting surface and the second cutting surface are provided with a clearance angle, and the third cutting surface is provided with an inclination angle, which greatly reduces the friction between the chip and the machined welding surface, reduces the vibration during the cutting process, and ensures the grinding quality of the welding electrode.

[0034] 3. The settings of the first chip removal surface, the second chip removal surface, the first chip discharge groove, and the second chip discharge groove ensure that the waste chips removed by the transverse edge can be smoothly discharged during the cutting process without accumulation, thereby improving the cutting quality.

[0035] 4. Multiple chip breaking grooves are provided on the cutting surface to break the cutting edge, which can narrow the width of the chip during the cutting process, making it easy to discharge from the chip discharge groove without clogging, improving the grinding quality of the welding surface, and thus extending the working life of the tool.

[0036] 5. By adding the third cutting surface and the transverse edge at an angle to the first and second cutting edges, the waste chips generated by the central cutting of the tool can be effectively discharged, reducing the vibration during the grinding process, improving the grinding quality of the welding surface, and thus extending the working life of the tool. Brief Description of the Drawings

[0037] Figure 1 It is a three-dimensional structure diagram of the first embodiment of the present invention.

[0038] Figure 2 It is Figure 1 the X-direction (main) view in

[0039] Figure 3 It is Figure 1 the Z-direction (top) view in

[0040] Figure 4 It is Figure 3 the sectional view of the A-A section in

[0041] Figure 5 It is Figure 3 the enlarged view of the central part of

[0042] Figure 6 It is the schematic diagram of the cutting movement of the first embodiment.

[0043] Figure 7 It is the schematic diagram of the developed curve of the cutting edge of the first embodiment.

[0044] Figure 8 It is the schematic diagram of the grinding state of the first embodiment.

[0045] Figure 9 It is the schematic diagram of the grinding state of the second embodiment.

[0046] Figure 10 It is a three-dimensional structure diagram of the third embodiment of the present invention.

[0047] Figure 11 It is Figure 10 the X-direction (main) view in

[0048] Figure 12 It is Figure 10Enlarged view of the central part.

[0049] Figure 13 Schematic diagram of the grinding state for Embodiment 3.

[0050] In the figure: 1 - support - type main body, 2 - first cutting groove, 2a - second trailing edge, 2b - first trailing edge, 21 - first cutting surface, 22 - third cutting surface, 23 - second cutting surface, 24 - first cutting edge, 241 - first forming groove, 25 - second cutting edge, 251 - second forming groove, 26 - first cross - edge, 27 - first chip - discharging groove, 28 - second chip - discharging groove, 3 - second cutting groove, 31 - fourth cutting surface, 33 - fifth cutting surface, 34 - third cutting edge, 35 - fourth cutting edge, 36 - second cross - edge, 37 - third chip - discharging groove, 4 - second chip - discharging surface, 5 - first chip - discharging surface, 6 - first chip - breaking groove, 7 - second chip - breaking groove, 81 - first rake face, 82 - second rake face, 91 - upper welding electrode, 92 - lower welding electrode, a - distance between the first cutting edge and the second cutting edge, OO’ - rotation center axis, α - clearance angle, —oblique angle of the cross - edge. Detailed implementation manners

[0051] The following further elaborates on the grinding blade and grinding method of the welding electrode of the present invention in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the technical solutions of the present invention and not to limit the scope of the present invention. In addition, the accompanying drawings are only schematic diagrams, so the devices and equipment described in the present invention are not limited by the dimensions or ratios of the schematic diagrams.

[0052] It should be noted that in the claims and the specification of the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non - exclusive inclusion, such that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not explicitly listed, or also includes elements inherent in such process, method, article or device. Without further limitation, an element defined by the statement "comprising one" does not exclude the presence of another identical element in the process, method, article or device including the said element.

[0053] It should be noted that in the claims and the specification of the present invention, positional relationships such as "horizontal", "vertical", "longitudinal", "lateral", "upright", "upper", "lower", "clockwise", "counterclockwise", "outer" and "inner" are relative to the main structure of the grinding blade described in the present invention.

[0054] It should be understood that within the scope of the present invention, the above technical features in this specification can be combined with the technical features specifically described below (such as in the embodiments) to form new or preferred technical solutions. Due to space limitations, they will not be elaborated one by one here.

[0055] Embodiment 1

[0056] This embodiment discloses a grinding blade that can simultaneously cut and restore the welding surfaces of two vertically opposite welding electrodes with different degrees of damage. Through this grinding blade, the welding surfaces of the upper and lower welding electrodes can be cut and trimmed respectively, so as to grind an electrode cap with a specific geometric feature on the welding surface, or restore an integral welding electrode with a specific geometric feature on the welding surface. The grinding of the welding electrode can be repeated as many times as possible until the welding surface no longer supports trimming due to material loss.

[0057] As Figure 1 、 Figure 2 and Figure 3 shown, the grinding blade is of an integral structure and is provided with a I-shaped support-type main body 1; the support-type main body 1 is composed of a cutting part in the middle and mounting parts at both ends, the cutting part is fixedly clamped between the mounting parts at both ends, and the center of the support-type main body 1 has a rotation center axis OO' along the vertical direction (Z-axis). The cutting part includes a first cutting groove 2 and a second cutting groove 3 that are vertically opposite to each other, and the first cutting groove 2 and the second cutting groove 3 are used for cutting the welding electrode. Their structural shapes and dimensions are the same, and they are arranged symmetrically about the horizontal plane PP'. One side elevation of the cutting part is provided with a first rake face 81 and a second chip removal face 4 along the vertical direction (Z-axis), and the other side elevation is provided with a second rake face 82 and a first chip removal face 5 along the vertical direction (Z-axis). The first rake face 81 and the second chip removal face 4 are symmetrically arranged with respect to the rotation center axis OO' respectively with the second rake face 82 and the first chip removal face 5. When grinding the welding electrode, the grinding blade rotates clockwise around the rotation center axis OO' for a cutting motion (observed from the Z direction in Figure 1 , see Figure 6 ; the "front" and "rear" mentioned below are based on the forward direction of this rotary cutting motion.

[0058] It is worth mentioning that although the support-type main body 1 in this embodiment is I-shaped, in fact, it is not limited to this, and it can be other similar variants, including that threaded holes, through holes, steps or protrusions, recesses, etc. for connecting with external mounting components can be provided locally inside it.

[0059] Since the shapes of the first cutting groove 2 and the second cutting groove 3 are symmetrically the same, the structural features of the first cutting groove 2 will be mainly introduced in this embodiment.

[0060] The first cutting groove 2 includes a first cutting surface 21 and a second cutting surface 23 located on the upper side of the cutting part. 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 with the first rake face 81, and the intersection line forms a first cutting edge 24. It intersects with the first chip fluting face 5, and the intersection line forms a first trailing edge 2b. The second cutting surface 23 intersects with the second rake face 82, and the intersection line forms a second cutting edge 25; it intersects with the second chip fluting face 4, and the intersection line forms a second trailing edge 2a. The first cutting edge 24 and the first trailing edge 2b are symmetrically arranged with respect to the rotation center axis OO' with the second cutting edge 25 and the second trailing edge 2a respectively.

[0061] As Figure 4 shown, the first cutting surface 21 between the first trailing edge 2b and the first cutting edge 24 gradually inclines inward from the first cutting edge 24, such that the first trailing edge 2b is lower than the first cutting edge 24, thereby forming a clearance angle α with the cutting plane. Similarly, the second cutting surface 23 gradually inclines inward from the second cutting edge 25, such that the second trailing edge 2a is lower than the second cutting edge 25, thereby forming a clearance angle. The function of the clearance angle α is to greatly reduce the friction between the first cutting surface 21 and the machined welding surface when cutting the welding electrode. Its value is generally 1 to 20°, preferably 3 to 15°.

[0062] Please refer to Figure 1 、 Figure 3 and Figure 5 , the first cutting edge 24 and the second cutting edge 25 are connected by a first cross edge 26. The first cross edge 26 intersects with the rotation center axis OO' at the midpoint of the first cross edge 26. The shape and size on both sides of the first cross edge 26 are symmetric with respect to the rotation center axis OO'. The cutting edge development curve of the first cutting edge 24, the second cutting edge 25 and the first cross edge 26 in the vertical plane is as Figure 7 shown. The first cutting edge 24 and the second cutting edge 25 have the same height in the vertical direction (Z-axis). The whole cutting edge development curve is symmetric with respect to the rotation center axis OO'; the dressing blade of the present invention can adapt to the dressing of welding surfaces with various geometric features. The cutting edge development curve has a specific geometric shape, corresponding to the size and shape of the welding surface required by the dressed welding electrode. The first cutting edge 24, the second cutting edge 25 and the first cross edge 26 are in the most protruding position in the first cutting groove 2, and directly cut the welding electrode. In Figure 1 observed from the Z direction, asFigure 5 As shown, in the horizontal projection plane, the projection lines of the first cutting edge 24 and the second cutting edge 25 are parallel to each other, and the mutual spacing a is generally 0.01 - 2 mm, preferably 0.05 - 1.5 mm. The first chisel edge 26 forms a chisel edge rake angle with the first cutting edge 24 and the second cutting edge 25 Generally, the chisel edge rake angle is 15° to 150°, preferably 30° - 90°.

[0063] As Figure 5 shown, on both sides of the first chisel edge 26, third cutting surfaces 22 are formed downward respectively, and the inclination angle of the third cutting surface 22 has a similar effect to the flank angle α, but its value can be the same as or different from the flank angle α. At the intersections of the third cutting surfaces 22 on both sides with the support - type main body 1, a first chip - discharging groove 27 and a second chip - discharging groove 28 are respectively provided. The first chip - discharging groove 27 and the second chip - discharging groove 28 are significantly lower than the third cutting surface 22, and their function is to enable the waste chips cut by the first chisel edge 26 to be smoothly discharged during the cutting process without accumulation.

[0064] Generally, the surfaces of all cutting surfaces, rake faces, chip - discharging faces and chip - discharging grooves on the dressing blade all have wear - resistant coating layers.

[0065] The second cutting groove 3 is located at the lower part of the cutting portion and is symmetrical to the first cutting groove 2; please refer to Figure 2 , the second cutting groove 3 includes a third cutting edge 34 formed by the intersection of the fourth cutting surface 31 and the first rake face 81, a fourth cutting edge 35 formed by the intersection of the fifth cutting surface 33 and the second rake face 82, and a second chisel edge 36 formed by the intersection of two sixth cutting surfaces; the fourth cutting surface 31 and the fifth cutting surface 33 have a flank angle α, and the sixth cutting surface 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, with a mutual spacing a. The second chisel edge 36 forms a chisel edge rake angle with the third cutting edge 34 and the fourth cutting edge 35 The second chisel edge 36 intersects with the rotation center axis OO' at the mid - point of the second chisel edge 36. The third cutting edge 34, the fourth cutting edge 35 and the second chisel edge 36 are in the most protruding position in the second cutting groove 3 and directly cut the lower welding electrode. The cutting edge development curve of it on the vertical plane is symmetrical about the rotation center axis OO' and corresponds to the size and shape of the welding surface required for the dressed lower welding electrode. At the intersections of the two sixth cutting surfaces with the support - type main body 1, a third chip - discharging groove 37 and a fourth chip - discharging groove lower than the sixth cutting surface are respectively provided.

[0066] The third cutting edge 34, the fourth cutting edge 35, the second cross edge 36, the fourth cutting surface 31, the fifth cutting surface 33, the sixth cutting surface, the third chip fluting 37 and the fourth chip fluting are symmetrically arranged with respect to the horizontal plane PP' and the first cutting edge 24, the second cutting edge 25, the first cross edge 26, the first cutting surface 21, the second cutting surface 23, the third cutting surface 22, the first chip fluting 27 and the second chip fluting 28 of the first cutting groove 2 respectively in a mirror image manner.

[0067] When using the dressing blade to cut and repair the welding electrode or the electrode cap, see Figure 6 , rotate the pedestal body 1 in a clockwise direction (observed from the Z direction in Figure 1 ) around the rotation center axis OO', and then insert the upper and lower welding electrodes (electrode caps) into the first cutting groove 2 and the second cutting groove 3 respectively by applying a certain pressure. Then, the first cutting edge 24, the second cutting edge 25 and the first cross edge 26, as well as the third cutting edge 34, the fourth cutting edge 35 and the second cross edge 36, respectively dress the welding surfaces of the upper and lower welding electrodes (electrode caps) to obtain the required geometric shape. The specific method steps are as follows:

[0068] 1) Prepare the dressing blade, and grind the first cutting edge 24, the second cutting edge 25 and the first cross edge 26 of the first cutting groove 2, as well as the third cutting edge 34, the fourth cutting edge 35 and the second cross edge 36 of the second cutting groove 3 into a predetermined shape according to the needs;

[0069] 2) Insert the pedestal body 1 into a hollow tool holder with a polygon or a circle on the outer periphery through the mounting parts at both ends to form a dressing tool, and install it on a dressing machine. Connect the upper welding electrode 91 and the lower welding electrode 92 to the used C-type welding torch or X-type welding torch, but without passing current, and place the dressing blade between the opposite upper welding electrode 91 and lower welding electrode 92;

[0070] 3) Start the motor of the dressing machine to drive the dressing blade to rotate clockwise through the tool holder, see Figure 6 ;

[0071] 4) Apply pressure to the welding torch to make the upper welding electrode 91 enter the first cutting groove 2 and the lower welding electrode 92 enter the second cutting groove 3, see Figure 8 . The rotating pedestal body 1 simultaneously cuts and trims the welding surfaces of the upper welding electrode 91 and the lower welding electrode 92 through the first cutting edge 24, the second cutting edge 25 and the first cross edge 26, as well as the third cutting edge 34, the fourth cutting edge 35 and the second cross edge 36, so as to finally restore the geometric shapes of the welding surfaces of the required upper welding electrode 91 and lower welding electrode 92.

[0072] The cutting amount, pressure, and time used are determined according to the materials and the shape and structure of the upper welding electrode 91 and the lower welding electrode 92. Generally, the pressure is from 400 N to 3000 N, preferably from 500 N to 2000 N; the cutting time is from 500 ms to 5000 ms, preferably from 1000 ms to 3500 ms;

[0073] The waste chips generated by the first cutting edge 24 and the third cutting edge 34 are discharged from the grinding tool through the second chip removal surface 4, the waste chips generated by the second cutting edge 25 and the fourth cutting edge 35 are discharged from the grinding tool through the first chip removal surface 5, the waste chips generated by the first transverse edge 26 are discharged from both sides through the second chip outlet groove 28 and the second chip removal surface 4 and the first chip outlet groove 27 and the first chip removal surface 5 from the grinding tool, and the waste chips generated by the second transverse edge 36 are discharged from both sides through the fourth chip outlet groove and the second chip removal surface 4 and the third chip outlet groove 37 and the first chip removal surface 5 from the grinding tool.

[0074] Embodiment 2

[0075] This embodiment can meet the grinding requirements of the upper welding electrode 91 and the lower welding electrode 92 with different welding surface shapes. The structure of this Embodiment 2 is basically the same as that of Embodiment 1, except that the first cutting groove 2 and the second cutting groove 3 are no longer symmetrically arranged with respect to the rotation center axis OO'.

[0076] In this embodiment, the structure of the first cutting groove 2 is similar to that of the second cutting groove 3, but the dimensions and shapes of the third cutting edge 34, the fourth cutting edge 35, and the second transverse edge 36 are different from those of the first cutting edge 24, the second cutting edge 25, and the first transverse edge 26, and are adjusted to corresponding different shapes and dimensions according to the operation requirements.

[0077] The state of repairing the welding surfaces of the upper welding electrode 91 and the lower welding electrode 92 using the grinding blade described in this Embodiment 2 is shown in Figure 9 as shown.

[0078] Embodiment 3

[0079] The structure of this Embodiment 3 is basically the same as that of Embodiment 1, except that forming grooves are provided on the cutting edges and chip breaking grooves are provided on the cutting surfaces.

[0080] Please refer to Figure 10 , Figure 11 and Figure 12, the illustrated grinding blade is provided with a pedestal-type main body, which consists of a cutting part in the middle and mounting parts at both ends, and has a rotation center axis OO' in the vertical direction at the center. One vertical surface of the cutting part is provided with a first rake face 81 and a second chip fluting face 4, and the other vertical surface is provided with a second rake face 82 and a first chip fluting face 5. The cutting part includes a first cutting groove 2 and a second cutting groove 3 which are opposite to each other up and down.

[0081] The first cutting groove 2 includes a first cutting surface 21, a second cutting surface 23 and two third cutting surfaces located on the upper side of the cutting part, a first cutting edge 24 formed by the intersection of the first cutting surface 21 and the first rake face 81, a second cutting edge 25 formed by the intersection of the second cutting surface 23 and the second rake face 82, and a first cross edge 26 formed by the intersection of the two third cutting surfaces. The first cutting surface 21 and the second cutting surface 23 are inclined inwards and have a clearance angle with the cutting plane; one or more first chip breaking grooves 6 and second chip breaking grooves 7 are respectively provided on the first cutting surface 21 and the second cutting surface 23, so that the cutting edges of the first cutting edge 24 and the second cutting edge 25 are broken in the middle, and the width of the chip can be narrowed during the cutting process, so that it is easy to discharge from the chip fluting groove and no blockage phenomenon will occur; the depth of the first chip breaking groove 6 and the second chip breaking groove 7 is generally 0.01 - 1 mm. The two third cutting surfaces are located in the middle of the first cutting groove 2 and both have an inclination angle. First chip fluting grooves and second chip fluting grooves are respectively provided at the intersections of the two third cutting surfaces and the pedestal-type main body. First forming grooves 241 and second forming grooves 251 are respectively arranged on the first cutting edge 24 and the second cutting edge 25, see Figure 12 , so as to cut out an annular boss on the welding surface of the welding electrode during cutting. The first cross edge 26 is connected between the first cutting edge 24 and the second cutting edge 25. The first cross edge 26 intersects with the rotation center axis OO' at the midpoint of the first cross edge 26 and has a convex arc shape; the first cutting edge 24, the second cutting edge 25 and the first cross edge 26 are in the most protruding positions in the first cutting groove 2 and directly cut the welding electrode. The cutting edge development curve of them on the vertical surface is symmetric with respect to the rotation center axis OO' and corresponds to the size and shape of the welding surface required for the ground 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 the mutual distance a (see Figure 12 ), and the distance a is 0.01 - 2 mm, preferably 0.05 - 1.5 mm. The first cross edge 26 and the first cutting edge 24 and the second cutting edge 25 form a cross edge oblique angle This cross edge oblique angle is 15 degrees to 90 degrees, preferably 30 degrees to 90 degrees.

[0082] The shape and size on both sides of the first transverse edge 26 are symmetrical about the rotation central axis OO'. The positions and shapes of the two third cutting surfaces are also symmetrical about the rotation central axis OO'. The first rake face 81, the second chip removal face 4, the first cutting face 21, the first cutting edge 24, the first forming groove 241 and the first chip outlet groove are symmetrically arranged with respect to the rotation central axis OO' and the second rake face 82, the first chip removal face 5, the second cutting face 23, the second cutting edge 25, the second forming groove 251 and the second chip outlet groove respectively.

[0083] The second cutting groove 3 is located at the lower part of the cutting portion and is arranged in a mirror symmetry with respect to the horizontal plane with the first cutting groove 2.

[0084] When using the grinding blade described in the third embodiment to cut and repair the welding electrode or the electrode cap, see Figure 13 , the support - type main body 1 rotates along the clockwise direction (observed from the Z - direction in Figure 1 ), around the rotation central axis OO'. Then, by applying a certain pressure, 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. Thus, 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 grind the outer sides of the welding surfaces of the upper and lower welding electrodes (electrode caps) into a shape with an annular convex ring; the first transverse edge 26 and the second transverse edge 36 respectively grind the centers of the welding surfaces of the upper and lower welding electrodes (electrode caps) into a concave arc shape.

[0085] In the present invention, the grinding blade can be made of various materials that can be used to make cutting tools, including various alloy tool steels, high - speed tool steels, cemented carbides, ceramic alloys, etc.; it can be processed by various heat treatment methods, including integral quenching, surface quenching, carburizing, nitriding, carbonitriding, etc. The grinding blade is formed as a whole, for example, by casting, sintering, or by machining such as cutting and grinding, or by wire cutting or electro - erosion deposition; the surface of the grinding blade is coated with a wear - resistant coating such as titanium or alumina to have sufficient wear - resistant performance and sharp cutting performance.

[0086] It should be noted that the upper welding electrode 91 and the lower welding electrode 92 described in the present invention can be made of any conductive and heat - conductive materials suitable for spot welding, and such materials may age during welding. For example, they can be made of copper alloys, such as copper - chromium (CuCr) alloy, copper - chromium - zirconium (CuCrZr) alloy, copper alloy added with alumina particles, and various other copper alloys that can be used as electrode materials.

[0087] If necessary, the grinding blade can also be used to trim and cut a pair of welding electrodes used in resistance spot welding of heterogeneous workpieces, such as welding of aluminum alloy and steel; in addition, the cut and trimmed welding electrodes can also be used for multi-layer resistance spot welding of multiple materials, such as three-layer or four-layer, equal-thickness or unequal-thickness resistance spot welding operations. The lap contact surface of the workpiece can contain various adhesives for material connection or epoxy resins with thermosetting effects, such as filling Uniseal 2343 adhesive with thermosetting effect in the intermediate layer.

[0088] In addition, it should be understood that after reading the above content of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A grinding blade for a welding electrode, characterized in that: The described grinding blade includes a support - type main body, which has a structure symmetric about the central vertical rotation axis. One side elevation of the support - type main body is provided with a first rake face and a second chip - removal face, the other side elevation is provided with a second rake face and a first chip - removal face, and the upper part is provided with a first cutting groove. The first cutting groove includes a first cutting face, a second cutting face, and two third cutting faces located on the upper side face of the support - type main body, a first cutting edge formed by the intersection of the first cutting face and the first rake face, a second cutting edge formed by the intersection of the second cutting face and the second rake face, and a first cross - edge formed by the intersection of the two third cutting faces. The first cross - edge is connected between the first cutting edge and the second cutting edge, intersects the rotation center axis at the mid - point of the first cross - edge. The first cutting edge, the second cutting edge, and the first cross - edge are in the most protruding position in the first cutting groove, directly cutting the welding electrode. The cutting - edge development curve of it on the elevation is symmetric about the rotation center axis and corresponds to the size and shape of the welding surface required for the ground welding electrode. The first cutting face and the second cutting face are inclined inwards and have a clearance angle with the cutting plane. The two third cutting faces are inclined inwards and have an inclination angle. First chip - removal grooves and second chip - removal grooves are respectively provided at the intersections of the two third cutting faces and the support - type main body. The support - type main body rotates and cuts along the clockwise direction around the rotation center axis. The welding electrode extends into the first cutting groove, and the first cutting edge, the second cutting edge, and the first cross - edge grind the welding surface of the welding electrode into a specific size and shape.

2. The grinding blade for a welding electrode according to claim 1, wherein: The lower part of the support - type main body is provided with a second cutting groove. The structure of the second cutting groove is symmetric and the same as that of the first cutting groove, including a third cutting edge, a fourth cutting edge, a second cross - edge, a fourth cutting face, a fifth cutting face, a sixth cutting face, a third chip - removal groove, and a fourth chip - removal groove corresponding to the first cutting edge, the second cutting edge, the first cross - edge, the first cutting face, the second cutting face, the third cutting face, the first chip - removal groove, and the second chip - removal groove respectively. When the support - type main body rotates and cuts along the clockwise direction around the rotation center axis, the welding electrode extends into the second cutting groove, and the third cutting edge, the fourth cutting edge, and the second cross - edge directly cut the welding electrode, grinding the welding surface of the welding electrode into a specific size and shape.

3. The grinding blade for welding electrode according to claim 2, wherein: The structure, size, and shape of the second cutting groove are completely symmetric and the same as those of the first cutting groove with respect to the horizontal plane.

4. The grinding blade for welding electrode according to claim 1, wherein: 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 cross - edge forms a cross - edge oblique angle with the first cutting edge and the second cutting edge.

5. The dressing blade for the welding electrode 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 dressing blade for a welding electrode according to claim 4, wherein: The cross - edge oblique angle formed by the first cross - edge and the projection lines of the first cutting edge and the second cutting edge in the horizontal projection plane is 15 - 150°.

7. The grinding blade for the welding electrode according to claim 1, characterized in that: The clearance angles of the first cutting face and the second cutting face are 1 - 20°.

8. The grinding blade for a welding electrode according to claim 1 or 7, characterized in that: The inclination angle of the third cutting surface is the same as the relief angle values of the first and second cutting surfaces.

9. The grinding blade for a welding electrode according to claim 1, characterized in that: The first and second cutting edges are respectively provided with a first forming groove and a second forming groove.

10. The grinding blade for a welding electrode according to claim 1, characterized in that: The first and second cutting surfaces are respectively provided with a first chip breaker groove and a second chip breaker groove.

11. The grinding blade for the welding electrode according to claim 10, characterized in that: The depths of the first and second chip breaker grooves are 0.01 - 1 mm.

12. A grinding method for a welding electrode of a grinding blade according to any one of claims 1-11, characterized in that: It includes the following steps: 1) Grind the first cutting edge, the second cutting edge, the first transverse edge of the first cutting groove, the third cutting edge, the fourth cutting edge and the second transverse edge of the second cutting groove into a predetermined shape according to requirements to complete the preparation of the dressing blade. 2) Insert the dressing blade into the hollow tool holder to form a dressing tool, and install it on the dressing machine. Connect the upper welding electrode and the lower welding electrode of the welding electrode to the welding torch, but do not conduct current. Place the dressing blade between the opposing upper and lower welding electrodes. 3) Start the dressing machine and drive the dressing blade to rotate clockwise through the tool holder. 4) By applying pressure, make the upper and lower welding electrodes respectively enter the first and second cutting grooves. The rotating dressing blade simultaneously cuts and trims the welding surfaces of the upper and lower welding electrodes respectively, and finally restores to the geometric shape of the required welding surface. The pressure and time used are determined according to the material and shape structure of the welding electrode. During the cutting process, the waste chips generated by the first and third cutting edges are discharged through the second chip removal surface. The waste chips generated by the second and fourth cutting edges are discharged through the first chip removal surface. The waste chips generated by the first transverse edge are discharged from both sides through the second chip discharge groove and the second chip removal surface, and the first chip discharge groove and the first chip removal surface respectively. The waste chips generated by the second transverse edge are discharged from both sides through the fourth chip discharge groove and the second chip removal surface, and the third chip discharge groove and the first chip removal surface respectively.

13. The method for grinding a welding electrode according to claim 12, characterized in that: In step 4), the pressure is 400 - 3000 N and the cutting time is 500 - 5000 ms.

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