JP7712494B2 - Dresser and method for dressing a welding electrode having a projection with a double helix structure - Google Patents

Description

The present invention relates to the technical field of a dressing device for a welding electrode having a double helix structure, and more particularly to a dresser and a dressing method for dressing a welding electrode having a projection with a double helix structure.

Resistance spot welding is a method of joining two or more overlapping workpieces by applying pressure and current through contact between electrodes, and using the resistance between the workpieces to generate heat and melt the material. This method is currently the main manufacturing process in the production of steel car bodies in automobile production. In order to reduce production costs and expand the amount and range of use of aluminum alloys, welding electrodes with high welding strength, long service life, and easy distribution are required. Welding electrodes with a double helix structure on the weld end surface can fully overcome the disadvantages of aluminum alloy spot welding, such as low joint strength, severe splashing, and large current value.

However, currently there is no fast and effective dresser for double-helix welding electrodes. There is an urgent need in this field for a cutting cutter for dressing the surface of an electrode and a method for using the same that can effectively solve the above problems.

Therefore, the present invention aims to provide a dresser for dressing a welding electrode having a protrusion with a double helix structure in order to solve the problem that there is currently no fast and effective dresser for a welding electrode having a protrusion with a double helix structure.

To achieve the above objective, the technical means of the present invention are realized as follows:

A dresser for dressing a welding electrode having a protrusion with a double helix structure includes a dresser assembly, a reciprocating stepping motor, a driving screw, a screw support, a fixed base, a dresser assembly rotating base, a base lock block, and two electrode assemblies, the electrode assemblies are respectively provided above and below one side of the dresser assembly, the bottom of the dresser assembly is fixedly connected to the dresser assembly rotating base, the bottom end of the dresser assembly rotating base is rotatably connected to the base lock block, the base lock block is meshed and connected to one end of the driving screw, a screw fixing sleeve is fitted on the outside of the driving screw, and the screw fixing sleeve is fixed to one side of the screw support, the other end of the driving screw passes through the screw support and is fixedly connected to an output shaft of the reciprocating stepping motor, the bottom of the reciprocating stepping motor and the screw support are fixedly connected to the fixed base, and the electrode assembly and the reciprocating stepping motor are signal-connected to a controller.

Furthermore, the dresser assembly includes a first cutting cutter assembly, a second cutting cutter assembly, a third cutting cutter assembly, and a cutter assembly fixed plate, and the cutter assembly fixed plate has a cylindrical structure and is fixedly connected to the first cutting cutter assembly, the second cutting cutter assembly, and the third cutting cutter assembly in the circumferential direction, respectively, and has a bottom fixedly connected to the dresser assembly rotating base.

Furthermore, the first cutting cutter assembly includes a first cutter assembly holder, a first cutter assembly base, a first support spring, and two first cutter heads, the first cutter assembly holder is provided on one side of the cutter assembly fixed plate, the first cutter assembly holder and the cutter assembly fixed plate are formed as an integral structure, a first groove is provided on the other end of the first cutter assembly holder, the first cutter assembly base is attached to the inner wall of the first groove, a first support spring is attached to the center of the first cutter assembly base, and the first cutter heads are fixedly attached to both the upper and lower ends of the first cutter assembly base, respectively, and the first cutter heads are used to cut the outer edge and outer periphery of the electrode tip of the electrode assembly.

Furthermore, the second cutting cutter assembly includes a second cutter assembly holder, an upper cutter head base, a lower cutter head base, a second support spring, and two second cutter heads. One end of the second cutter assembly holder is provided on one side of the cutter assembly fixed plate, and the second cutter assembly holder and the cutter assembly fixed plate are formed as an integral structure. A second groove is provided on the other end of the second cutter assembly holder. The upper cutter head base and the lower cutter head base are movably attached to the upper and lower ends of the inner wall of the second groove, respectively. The upper cutter head base and the lower cutter head base have the same structure and are both symmetrically arranged in the second groove. The upper cutter head base and the lower cutter head base are fixed to both ends of the second support spring, respectively. The second cutter heads are fixedly attached to the top of the upper cutter head base and the bottom of the lower cutter head base, respectively. The second cutter heads are used to cut the equally spaced portions of the top convex groove of the electrode tip.

Furthermore, the third cutting cutter assembly includes a third cutter assembly holder, a third cutter assembly base, a third support spring, and two third cutter heads, the third cutter assembly holder is provided on one side of the cutter assembly fixed plate, the third cutter assembly holder and the cutter assembly fixed plate are formed as an integral structure, a third groove is provided on the other end of the third cutter assembly holder, the third cutter assembly base is attached to the inner wall of the third groove, a third support spring is attached to the center of the third cutter assembly base, and third cutter heads are fixedly attached to both the upper and lower ends of the third cutter assembly base, respectively, and the third cutter heads are used to cut the spacing change portion of the top convex groove of the electrode tip.

The electrode assembly further includes a reciprocating motor, a rotating shaft, a locking head, and three locking buckles, the output shaft of the reciprocating motor is fixedly connected to one end of the rotating shaft, the other end of the rotating shaft is fixedly connected to the bottom of the locking head, three locking buckles are arranged in a circumferential direction on the surface of the top of the locking head, the ends of the three locking buckles close to the axis of the locking head have a curved structure, electrode chips are fixed to the ends of the three locking buckles close to the axis of the locking head, and the reciprocating motor is signal-connected to the controller.

In addition, a slide rail is provided at the bottom of the fixed base.

Compared with the prior art, the dresser for dressing a welding electrode having a protrusion with a double helix structure according to the present invention has the following advantages:
(1) The dresser for dressing welding electrodes with protrusions of double helix structure according to the present invention has a simple structure and a reasonable design, which solves the problem that in actual production, repeated spot welding causes various degrees of wear and aging on the end surface of the electrode due to the action of pressure and current. In order to deal with various aging and cutting of worn parts of the electrode tip, three different shapes of cutter heads are provided, which is easy to operate, economical, practical, and easy to be popularized.

Another object of the present invention is to propose a method for dressing a welding electrode having a protrusion with a double helix structure in order to solve the problem that there is currently no fast and effective dressing method for a welding electrode having a protrusion with a double helix structure.

To achieve the above objective, the technical means of the present invention are realized as follows:

A method for dressing a welding electrode having a projection of a double helix structure, comprising:
S1: removing dirt from the surface of the electrode tip, and selecting a first support spring, a second support spring, and a third support spring that correspond to three types of cutter heads;
S2: Adjusting the distance between the two electrode tips, setting the pressing forces of the first cutter head, the second cutter head, and the third cutter head by an external power source, and setting the electrode tips to their cutting start positions after pressing;
S3, rotating the two electrode tips by two reciprocating rotary motors;
S4. Using a first cutter head, cutting the outer edge and periphery of the electrode tip;
S5. Using a second cutter head to cut the equally spaced portions of the top convex grooves of the electrode tip;
S6, using a third cutter head to cut a spacing change portion of the top convex groove of the electrode tip.

Compared with the prior art, the dressing method for dressing a welding electrode having a protrusion with a double helix structure according to the present invention has the following advantages:
(1) The dressing method for dressing a welding electrode having a protrusion with a double helix structure according to the present invention is reasonably designed, and by this method, the cutting cutter of the present invention can simultaneously cut and restore the geometric shape of the welding surface of a welding electrode having a protrusion with a double helix structure that has experienced various aging deterioration mechanisms, which is more accurate and rapid, and can maintain high welding quality.

The drawings constituting a part of this invention are intended to provide a further understanding of the invention, and the exemplary embodiments of the invention and their explanations are intended to explain the invention and are not intended to unduly limit the invention.

1 is a schematic diagram showing an overall configuration of a dresser and a dressing method for dressing a welding electrode having a projection with a double helix structure according to an embodiment of the present invention; 1 is a schematic diagram showing a dresser assembly of a dresser and a dressing method for dressing a welding electrode having a projection with a double helix structure according to an embodiment of the present invention; FIG. FIG. 3 is an enlarged view of A in FIG. FIG. 3 is an enlarged view of B in FIG. FIG. 3 is an enlarged view of C in FIG. 1 is a cross-sectional view showing an overall configuration of a dresser and a dressing method for dressing a welding electrode having a projection with a double helix structure according to an embodiment of the present invention.

Please note that embodiments of the present invention and features in the embodiments may be combined with each other, unless inconsistent.

In the description of the present invention, the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., is based on the orientation or positional relationship shown in the drawings, and is merely for facilitating and simplifying the description of the present invention, and does not indicate or imply that the referred device or part must have a particular orientation, be configured and operate in a particular orientation, and should not be understood as limiting the present invention. In addition, terms such as "first", "second", etc. are merely for descriptive purposes, and should not be understood as indicating or implying a relative importance or implying the number of the technical features indicated. Thus, a feature limited by "first", "second", etc. may be expressly or implied to include one or more of the said feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, unless otherwise specified or limited, the terms "attached," "connected," and "coupled" should be understood in a broad sense, and may mean, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

The present invention will now be described in detail with reference to the drawings.

As shown in Figures 1 to 6, a dresser for dressing a welding electrode having a protrusion with a double helix structure includes a dresser assembly 1, a reciprocating stepping motor 3, a driving screw 4, a screw support 5, a fixed base 6, a dresser assembly rotating base 7, a base locking block 8, and two electrode assemblies 2, in which the electrode assemblies 2 are respectively provided on the upper and lower sides of one side of the dresser assembly 1, the bottom of the dresser assembly 1 is fixedly connected to the dresser assembly rotating base 7, and the bottom end of the dresser assembly rotating base 7 is rotatably connected to the base locking block 8. The dresser assembly rotating base 7 and the base locking block 8 are rotatably connected to each other, which makes it easy for an operator to replace different cutter heads. The base lock block 8 is meshed with one end of the driving screw 4, and in actual use, as shown in Fig. 6, the base lock block 8 is fitted to the outer wall of the driving screw 4 (a long through hole is provided in the outer wall of the driving screw 4 so that the base lock block 8 can move back and forth on the driving screw 4), and the base lock block 8 is meshed with the driving screw 4. Since the base lock block 8 functions as a screw nut, the rotation of the driving screw 4 causes the base lock block 8 to move back and forth along the axial direction of the driving screw 4, and the back and forth movement of the base lock block 8 causes the dresser assembly rotating base 7 to move back and forth, and the back and forth movement of the dresser assembly rotating base 7 causes the dresser assembly 1 to move back and forth. A screw fixing sleeve is fitted on the outside of the driving screw 4, and the screw fixing sleeve is fixed to one side of the screw support 5, and the other end of the driving screw 4 passes through the screw support 5 and is fixedly connected to the output shaft of the reciprocating stepping motor 3, and the bottom of the reciprocating stepping motor 3 and the screw support 5 are fixedly connected to the fixed base 6, and the electrode assembly 2 and the reciprocating stepping motor 3 are signal-connected to the controller. In actual production, repeated spot welding causes various degrees of wear and aging on the end surface of the electrode due to the action of pressure and current. This is mainly due to the fact that the temperature of the welding surface of the electrode rises during welding, causing local plastic deformation, or the reaction between the electrode and the material causes adhesion and accumulation of contaminants. The aging and shape changes of the electrode cause defects such as deterioration of welding quality and deterioration of surface quality, so it is very important to regularly restore the welding surface to its original shape. In addition, it is also very important to quickly and accurately recover without interrupting production. For the specific structure and operation principle of the welding electrode tip having a double helix protrusion suitable for this dressing method, reference can be made to Patent CN202110273861.7.

As a result of extensive research, the present application has developed a cutting cutter and method for dressing a double-helix welding electrode. Compared with the prior art, the cutting cutter of the present invention can simultaneously cut and restore the geometric shape of the welding surface of a double-helix welding electrode that has experienced various aging degradation mechanisms, and is more accurate and rapid, while maintaining high welding quality.

The dresser assembly 1 includes a first cutting cutter assembly 11, a second cutting cutter assembly 12, a third cutting cutter assembly 13, and a cutter assembly fixed plate 14. The cutter assembly fixed plate 14 has a cylindrical structure and is fixedly connected to the first cutting cutter assembly 11, the second cutting cutter assembly 12, and the third cutting cutter assembly 13 in the circumferential direction, respectively, and is fixedly connected to the dresser assembly rotating base 7 at the bottom. In order to suit the different spacing widths between the spiral convex grooves at the top of the electrode tip 25 and to enhance practicality, the cutting cutter is divided into three parts, the first part is the outer edge and center cutting cutter, i.e., the first cutting cutter assembly 11, the second part is the fixed-width rotating cutting cutter, i.e., the second cutting cutter assembly 12, and the third part is the variable-width double-spiral structure cutting cutter, i.e., the third cutting cutter assembly 13.

The first cutting cutter assembly 11 includes a first cutter assembly holder 112, a first cutter assembly base 113, a first support spring 114, and two first cutter heads 111. The first cutter assembly holder 112 is provided on one side of the cutter assembly fixed plate 14, and the first cutter assembly holder 112 and the cutter assembly fixed plate 14 are formed as an integral structure. A first groove is provided on the other end of the first cutter assembly holder 112, and the first cutter assembly base 113 is attached to the inner wall of the first groove. The first support spring 114 is attached to the center of the first cutter assembly base 113. The first cutter heads 111 are fixedly attached to both the upper and lower ends of the first cutter assembly base 113, and the first cutter heads 111 are used to cut the outer edge and outer periphery of the electrode tip 25 of the electrode assembly 2. In this embodiment, the first cutter head 111 has an irregular structure consisting of right angles and curves when viewed from the front in order to cut the outer edge and outer periphery of the electrode tip 25.

The second cutting cutter assembly 12 comprises a second cutter assembly holder 122, an upper cutter head base 123, a lower cutter head base 124, a second support spring 125, and two second cutter heads 121. One end of the second cutter assembly holder 122 is provided on one side of the cutter assembly fixing plate 14, and the second cutter assembly holder 122 and the cutter assembly fixing plate 14 are formed as an integral structure. A second groove is provided on the other end of the second cutter assembly holder 122, and the upper cutter head base 123 and the lower cutter head base 124 are provided on both upper and lower ends of the inner wall of the second groove. The lower cutter head base 124 is movably attached, the upper cutter head base 123 and the lower cutter head base 124 have the same structure and are symmetrically arranged in the second groove, the upper cutter head base 123 and the lower cutter head base 124 are fixed to both ends of the second support spring 125, and the second cutter head 121 is fixedly attached to the top of the upper cutter head base 123 and the bottom of the lower cutter head base 124, respectively, and is used to cut the evenly spaced parts of the top convex groove of the electrode tip 25. In this embodiment, the second cutter head 121 has an irregular structure that is a rectangle with two right angles cut out in a side view to accommodate cutting the evenly spaced parts of the top convex groove of the electrode tip 25.

The third cutting cutter assembly 13 includes a third cutter assembly holder 132, a third cutter assembly base 133, a third support spring 134, and two third cutter heads 131. The third cutter assembly holder 132 is provided on one side of the cutter assembly fixed plate 14, and the third cutter assembly holder 132 and the cutter assembly fixed plate 14 are formed as an integral structure. A third groove is provided on the other end of the third cutter assembly holder 132, and the third cutter assembly base 133 is attached to the inner wall of the third groove. The third support spring 134 is attached to the center of the third cutter assembly base 133. The third cutter heads 131 are fixedly attached to both the upper and lower ends of the third cutter assembly base 133, and the third cutter heads 131 are used to cut the spacing change portion of the top convex groove of the electrode tip 25. The structures of the first cutter assembly base 113 and the third cutter assembly base 133 are the same as those of the second cutter assembly base. In this embodiment, the third cutter head 131 has an irregular structure that is hook-shaped in a plan view to accommodate cutting of the top convex groove of the electrode tip 25 where the spacing changes.

The electrode assembly 2 further includes a reciprocating rotary motor 21, a rotating shaft 22, a locking head 23, and three locking buckles 24. The output shaft of the reciprocating rotary motor 21 is fixedly connected to one end of the rotating shaft 22, the other end of the rotating shaft 22 is fixedly connected to the bottom of the locking head 23, the three locking buckles 24 are arranged in a circumferential direction on the surface of the top of the locking head 23, the ends of the three locking buckles 24 close to the axis of the locking head 23 have a curved structure, the electrode tip 25 is fixed to the ends of the three locking buckles 24 close to the axis of the locking head 23, and the reciprocating rotary motor 21 is signal-connected to the controller. In a specific use, the output shaft of the reciprocating rotary motor 21 rotates to rotate the rotating shaft 22, the rotating shaft 22 rotates to rotate the locking head 23, the locking head 23 rotates to rotate the electrode tip 25, and the electrode tip 25 rotates to correspond to the cutting of the three cutter heads.

A slide rail is provided at the bottom of the fixed base 6. Providing the slide rail makes it easier for the operator to move the dresser to the cutting station, saving time and labor and increasing the cutting speed.

The controller and the reciprocating stepper motor 3 are both conventional technology. The controller may be a PLC or an industrial computer.

The principle of operation of the dresser for dressing welding electrodes having protrusions of double helix structure is as follows.

When using the first cutter head 111, the operator presses the first cutter head 111 to the cutting start position of the electrode tip 25 and manually starts the controller. The controller controls the start of operation of the two reciprocating rotary motors 21, and the output shafts of the upper and lower reciprocating rotary motors 21 rotate to rotate the two electrode tips 25, respectively, thereby achieving the purpose of cutting the rotating electrode tip 25 of the dresser assembly 1.

When using the second cutter head 121 or the third cutter head 131, the operator presses the second cutter head 121 or the third cutter head 131 to the cutting start position of the electrode tip 25, and manually starts the controller. The controller controls the start of operation of the reciprocating stepping motor 3 and the two reciprocating rotary motors 21, and the output shafts of the upper and lower two reciprocating rotary motors 21 rotate to rotate the two electrode tips 25 respectively, and the output shaft of the reciprocating stepping motor 3 rotates the driving screw 4 (the base lock block 8 functions as a screw nut, so when the driving screw 4 rotates, the screw nut moves back and forth on the driving screw 4), and the rotation of the driving screw 4 causes the base lock block 8 to move back and forth along the axial direction of the driving screw 4, and the back and forth movement of the base lock block 8 causes the dresser assembly rotating base 7 to move back and forth, and the back and forth movement of the dresser assembly rotating base 7 causes the dresser assembly 1 to move back and forth, and the dresser assembly 1 advances toward the center of the electrode tip 25 according to the rotation speed, thereby achieving the purpose of cutting the rotating electrode tip 25.

A method for dressing a welding electrode having a projection of double helix structure includes the following steps.

A1. Remove dirt from the surface of the electrode tip 25, clean the electrode tip 25, and select the first support spring 114, the second support spring 125, and the third support spring 134 that match the three types of cutter heads. Specifically, in this embodiment, the worker removes dirt from the electrode tip 25 according to the material and removal strength of the electrode tip 25, and then performs the subsequent work.

A2. The distance between the two electrode tips 25 is adjusted, and the first cutter head 111 is used to cut the outer edge and periphery of the electrode tip 25. Specifically, in this embodiment, the operator selects the first support spring 114 with a strength corresponding to the first cutter head 111, and the first cutter head 111 is pressed by an external power source to the cutting start position of the electrode tip 25, and the two upper and lower reciprocating rotary motors 21 rotate the electrode tip 25 to achieve the cutting purpose.

A3, the second cutter head 121 is used to cut the evenly spaced portion of the top convex groove of the electrode tip 25. Specifically, the evenly spaced portion of the top convex groove is the portion that is away from the center of the top of the electrode tip 25. In this embodiment, the operator selects a second support spring 125 with a strength corresponding to the second cutter head 121, and presses the second cutter head 121 with an external power source to the cutting start position of the electrode tip 25, and the two upper and lower reciprocating rotary motors 21 rotate, and the reciprocating stepping motor 3 advances toward the center of the electrode tip 25 according to the rotation speed, thereby ensuring that the center of the second cutter head 121 rotates and advances along the groove center line on the surface of the electrode tip 25.

A4, the third cutter head 131 is used to cut the spacing change part of the top convex groove of the electrode tip 25. Specifically, the spacing change part of the top convex groove is the part close to the center of the top of the electrode tip 25. In this embodiment, the operator selects a third support spring 134 with a strength corresponding to the third cutter head 131, and presses the third cutter head 131 with an external power source to the cutting start position of the electrode tip 25, and the two upper and lower reciprocating rotary motors 21 rotate, and the reciprocating stepping motor 3 advances toward the center of the electrode tip 25 according to the rotation speed, ensuring that the outer edge of the third cutter head 131 rotates and advances along the outer edge of the groove on the surface of the electrode tip 25.

Example 1
1. The cutting cutter can rotate around the axis of the first and second welding surfaces. Here, rotation means that the operator can select the first cutter head 111, the second cutter head 121, or the third cutter head by rotating the cutting cutter, and the first and second welding surfaces are the surfaces of the upper and lower electrode tips 25 to be cut. When the first and second welding surfaces are restored, a material in the range of 10 to 500 microns is removed from the surfaces. It is also possible to dress the welding surfaces after 10 to 1000 uses.

2. Different sizes of cutting cutters can be used for different sizes of double helix welding electrode tips.

3. Different cutter head materials and rotation advance speeds can be selected according to the surface materials and conditions of different electrode tips 25 so as to thoroughly clean the surface of the electrode tip 25.

Best form:
In the best mode, the electrode tip 25 is dressed after the welding surface has been used approximately 500 times.

Dressing the electrode tip with a double helix structure is divided into four stages. In the first stage of preparation, oily dirt on the surface of the electrode tip 25 is removed, the electrode tip 25 is attached to two upper and lower reciprocating rotary motors 21, and the speed at which the upper and lower reciprocating rotary motors 21 rotate the electrode tip 25 is set to 1 r/min.

In the second stage, there is no need to push the first cutter head 111 with the reciprocating stepping motor 3 during rotation. In the third and fourth stages, based on the conventional electrode tip 25, if the distance between the parallel convex grooves is 6 mm and the speed at which the reciprocating rotary motor 21 drives the electrode tip 25 to rotate is 1 r/min, the forward speed of the reciprocating stepping motor 3 is 6 mm/min.

In addition, when dressing, the pressing forces of the first cutter head 111, the second cutter head 121 and the third cutter head 131 are set to 650 N, 50 N and 1750 N, respectively, depending on the contact area between the different cutter heads and the electrode tip 25. Specifically, the second cutter head 121 presses the upper cutter head base 123 and the lower cutter head base 124 against the second support spring 125 by an external power source (the external power source is a conventional technology, and as long as the external power source does not affect the cutting of the electrode tip 25, a conventional driving motor can be used to drive the driving screw to press the bases of the three cutter heads to the set prestress of the three support springs, and a conventional electric telescopic rod can also be used to press the bases of the three cutter heads to the set prestress of the three support springs, and it is also necessary to ensure that the external power source does not affect the cutting of the electrode tip 25). The distance sensor (the distance sensor is also a conventional technology) monitors the compression distance of the second support spring 125 to calculate the pressure value (the principle of the pressing force of the first cutter head 111 and the third cutter head 131 is the same as that of the second cutter head 121, so the description is omitted here), and the final cutting depth is about 200 microns.

The above is merely a preferred embodiment of the present invention, and is not intended to limit the present invention. All modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

1: Dresser assembly 11: First cutting cutter assembly 111: First cutter head 112: First cutter assembly holder 113: First cutter assembly base 114: First support spring 12: Second cutting cutter assembly 121: Second cutter head 122: Second cutter assembly holder 123: Upper cutter head base 124: Lower cutter head base 125: Second support spring 13: Third cutting cutter assembly 131: Third cutter head 132: Third cutter assembly holder 133: Third cutter assembly base 134: Third support spring 14: Cutter assembly fixed plate 2: Electrode assembly 21: Reciprocating rotary motor 22: Rotating shaft 23: Lock head 24: Lock buckle 25: Electrode tip 3: Reciprocating stepping motor 4: Propulsion screw 5: Screw support 6: Fixed base 7: Dresser assembly rotating base 8: Base lock block

Claims (4)

A dresser for dressing a welding electrode having a projection of a double helix structure, comprising:
The dresser assembly (1) comprises a reciprocating stepping motor (3), a driving screw (4), a screw support (5), a fixed base (6), a dresser assembly rotating base (7), a base lock block (8), and two electrode assemblies (2). The electrode assemblies (2) are respectively provided on the top and bottom of one side of the dresser assembly (1). The bottom of the dresser assembly (1) is fixedly connected to the dresser assembly rotating base (7), and the bottom end of the dresser assembly rotating base (7) is rotatably connected to the base lock block (8). The block (8) is meshed with one end of the driving screw (4), a screw fixing sleeve is fitted to the outside of the driving screw (4), the screw fixing sleeve is fixed to one side of the screw support part (5), the other end of the driving screw (4) passes through the screw support part (5) and is fixedly connected to the output shaft of the reciprocating stepping motor (3), the bottom of the reciprocating stepping motor (3) and the screw support part (5) are fixedly connected to the fixed base (6), and the electrode assembly (2) and the reciprocating stepping motor (3) are signal-connected to a controller;
The dresser assembly (1) comprises a first cutting cutter assembly (11), a second cutting cutter assembly (12), a third cutting cutter assembly (13), and a cutter assembly stationary plate (14), the cutter assembly stationary plate (14) being of a cylindrical structure and fixedly connected to the first cutting cutter assembly (11), the second cutting cutter assembly (12), and the third cutting cutter assembly (13) in the circumferential direction, respectively, and the bottom is fixedly connected to the dresser assembly rotating base (7);
The first cutting cutter assembly (11) comprises a first cutter assembly holder (112), a first cutter assembly base (113), a first support spring (114), and two first cutter heads (111), the first cutter assembly holder (112) is provided on one side of a cutter assembly fixed plate (14), the first cutter assembly holder (112) and the cutter assembly fixed plate (14) are formed as an integral structure, a first groove is provided on the other end of the first cutter assembly holder (112), the first cutter assembly base (113) is attached to the inner wall of the first groove, the first support spring (114) is attached to the center of the first cutter assembly base (113), the first cutter heads (111) are fixedly attached to both upper and lower ends of the first cutter assembly base (113), and the first cutter heads (111) are used to cut the outer edge and outer periphery of the electrode tip (25) of the electrode assembly (2);
The second cutting cutter assembly (12) includes a second cutter assembly holder (122), an upper cutter head base (123), a lower cutter head base (124), a second support spring (125), and two second cutter heads (121). One end of the second cutter assembly holder (122) is provided on one side of the cutter assembly fixing plate (14), and the second cutter assembly holder (122) and the cutter assembly fixing plate (14) are formed as an integral structure. A second groove is provided on the other end of the second cutter assembly holder (122), and the upper cutter head base (123) is provided on both upper and lower ends of the inner wall of the second groove. 3), the lower cutter head base (124) is movably mounted, the upper cutter head base (123) and the lower cutter head base (124) have the same structure and are symmetrically arranged in the second groove, the upper cutter head base (123) and the lower cutter head base (124) are fixed to both ends of the second support spring (125), the second cutter head (121) is fixedly mounted on the top of the upper cutter head base (123) and the bottom of the lower cutter head base (124), and the second cutter head (121) is used to cut the equally spaced parts of the top groove of the electrode tip (25);
The third cutting cutter assembly (13) includes a third cutter assembly holder (132), a third cutter assembly base (133), a third support spring (134), and two third cutter heads (131). The third cutter assembly holder (132) is provided on one side of the cutter assembly fixing plate (14), the third cutter assembly holder (132) and the cutter assembly fixing plate (14) are formed as an integral structure, and a third groove is provided on the other end of the third cutter assembly holder (132). a third cutter assembly base (133) is attached to the inner wall of the third groove, a third support spring (134) is attached to the center of the third cutter assembly base (133), and third cutter heads (131) are fixedly attached to both upper and lower ends of the third cutter assembly base (133), respectively, and the third cutter heads (131) are used to cut the spacing- changing portion of the top convex groove of the electrode tip (25). 2. The dresser for dressing a welding electrode having a protrusion with a double helix structure according to claim 1, wherein the electrode assembly (2) further comprises a reciprocating motor (21), a rotating shaft (22), a locking head (23), and three locking buckles (24), an output shaft of the reciprocating motor (21) is fixedly connected to one end of the rotating shaft (22), and the other end of the rotating shaft (22) is fixedly connected to the bottom of the locking head (23), three locking buckles (24) are circumferentially arranged on a top surface of the locking head (23), ends of the three locking buckles (24) close to the axis of the locking head (23) have a curved structure, an electrode tip (25) is fixed to the ends of the three locking buckles (24) close to the axis of the locking head (23), and the reciprocating motor (21) is signal-connected to a controller. 2. The dresser for dressing a welding electrode having a projection of double helix structure according to claim 1, characterized in that a slide rail is provided at the bottom of the fixed base (6). A method for dressing a welding electrode having a projection of a double helix structure according to any one of claims 1 to 3, comprising:
S1: removing dirt from the surface of the electrode tip (25) and selecting a first support spring (114), a second support spring (125), and a third support spring (134) that correspond to three types of cutter heads;
S2: Adjusting the distance between the two electrode tips (25), setting the pressing forces of the first cutter head (111), the second cutter head (121), and the third cutter head (131) by an external power source, and setting the electrode tips (25) to their cutting start positions after pressing them;
S3: Rotating two electrode tips (25) by two reciprocating rotary motors (21);
S4. Using the first cutter head (111) to cut the outer edge and periphery of the electrode tip (25);
S5. Using the second cutter head (121) to cut the equally spaced portions of the top convex grooves of the electrode tip (25);
S6. Using a third cutter head (131), cutting a spacing change portion of the top convex groove of the electrode tip (25).