CN111673380B - Method for machining rotating shaft triangular spline by utilizing electric spark - Google Patents
Method for machining rotating shaft triangular spline by utilizing electric spark Download PDFInfo
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- CN111673380B CN111673380B CN202010464816.5A CN202010464816A CN111673380B CN 111673380 B CN111673380 B CN 111673380B CN 202010464816 A CN202010464816 A CN 202010464816A CN 111673380 B CN111673380 B CN 111673380B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/04—Electrodes specially adapted therefor or their manufacture
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Abstract
The invention discloses a processing method for processing a triangular spline of a rotating shaft by utilizing electric spark. By adopting the processing method, the electric spark processing principle is utilized to process the two triangular splines on the rotating shaft, so that the product can meet the standard requirement, the use of a user is met, the delivery cycle of the product is finished in advance, the processing efficiency is improved, and the manufacturing cost of an enterprise is correspondingly reduced. The processing method is easy to operate, can be popularized and applied to processing of various complex parts, and is suitable for popularization and application.
Description
Technical Field
The invention relates to the technical field of processing of a rotating shaft with splines, in particular to a processing method for processing a triangular spline of the rotating shaft by utilizing electric spark.
Background
The spline shaft is a mechanical transmission type, has the same function as a flat key, a semicircular key and an inclined key, and is used for transmitting mechanical torque, a longitudinal key groove is formed in the outer surface of the shaft, and a rotating part sleeved on the shaft is also provided with a corresponding key groove which can keep rotating synchronously with the shaft. While rotating, some shafts can slide longitudinally, such as gear shifting gears of a gearbox, and the dynamic balance of the shafts is crucial. Therefore, the rotating shaft with the spline is a structure widely applied to a transmission system, and has wide application prospect in high-tech fields such as aviation, aerospace, automobile manufacturing, high-grade numerical control equipment and the like.
With the development of science and technology, electric spark machining is widely applied to the field of machining, the principle of electric spark machining is to erode and remove redundant metal based on the electric corrosion phenomenon during pulse spark discharge between a tool electrode and a workpiece so as to meet the design and machining requirements on the size, shape and surface quality of a part, and the electric spark machining has the characteristics of high precision and suitability for machining special or complex shapes and difficult-to-cut materials. The electric spark machining can machine various materials with high melting point, high hardness, high strength, high purity and high toughness, and the machining mechanism is completely different from that of a cutting method. Meanwhile, the method is not influenced by the hardness of the material and the heat treatment condition. Secondly, the pulse discharge duration is extremely short, the heat generated during discharge is small in conduction and diffusion range, and the material is small in heat influence range. And thirdly, during machining, the tool electrode is not in contact with the workpiece material, and the macroscopic acting force between the tool electrode and the workpiece material is extremely small. The tool electrode material does not need to be harder than the workpiece material, and therefore, the tool electrode is easy to manufacture. Therefore, the electric spark machining can simplify the machining process, prolong the service life of the workpiece and reduce the labor intensity of workers.
The rotating shaft shown in fig. 1 is a product of a certain type currently applied to the field of aviation, and two triangular splines with different sizes need to be machined on the rotating shaft according to design requirements. Because the size of the rotating shaft is smaller, the standard tooth profile of the triangular spline is correspondingly smaller, the structure is compact, the precision requirement is high, and the standard requirement is difficult to achieve if the conventional common machining method is adopted. Therefore, aiming at the rotating shaft parts, in order to improve the machining efficiency and finish the delivery cycle of the product in advance, the electric spark mode is adopted for machining, so that the product can meet the standard requirement, the use requirement of a user can be met, and meanwhile, the manufacturing cost of an enterprise can be reduced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to improve the product quality and the processing efficiency, and utilizes the electric spark processing principle to process the rotating shaft with a plurality of triangular splines so as to achieve the processing precision and meet the use requirements of users, in particular to a processing method for processing the triangular splines of the rotating shaft by utilizing the electric spark.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a processing method for processing a triangular spline of a rotating shaft by utilizing electric sparks mainly comprises the steps of processing a connecting rod, processing an electrode and processing the triangular spline, and specifically comprises the following processing steps:
(1) processing the connecting rod:
s1, preparing materials: selecting 45 # round steel as a raw material for manufacturing the connecting rod, wherein the raw material of the 45 # round steel is phi 30x115 mm;
s2 turning worker once rough processing: fixing the selected connecting rod raw material on a power output mechanism of a lathe, cutting the connecting rod raw material to enable two end faces of the connecting rod raw material to be flat, ensuring that the length of the connecting rod raw material meets the design requirement before cutting, and manufacturing central positioning holes on the two end faces; then, roughly cutting the outer wall of the shaft body, manufacturing two sections of shaft necks with the diameter phi of 13mm and shaft bodies with the diameter phi of 25mm according to the design length requirement, then drilling an inner hole with the diameter phi of 14mm on the shaft bodies with the diameter phi of 25mm along the axial direction of the shaft bodies to ensure that the depth of the inner hole meets the design requirement, and manufacturing a hole chamfer angle of 1mmx30 degrees at the front end of the inner hole;
s3, carrying out thermal refining on the connecting rod which is subjected to the primary turning, wherein the heated size of the connecting rod is changed after the thermal refining, and cooling the connecting rod which is subjected to the thermal refining to the normal temperature;
s4, turning for secondary fine treatment: repairing an orifice chamfer and one central positioning hole in an inner hole of the connecting rod subjected to thermal refining, then finely machining two sections of shaft necks and shaft bodies with the outer circle diameters of phi 13mm and phi 25mm on a power output mechanism fixed on a lathe, and machining the shaft necks and the shaft bodies to the outer circle diameters of phi 12mm and phi 23 mm;
s5, manufacturing a threaded bottom hole: clamping the connecting rod after the fine treatment on a lathe, clamping and fixing and aligning by utilizing an excircle, controlling the jumping quantity of the connecting rod to be less than or equal to 0.02mm and the flat end surface to be 0.5mm, boring a phi 18mm cavity in an inner hole of a phi 23mm shaft body end, boring an M16x1.5mm threaded bottom hole in the bored cavity, and manufacturing threads and chamfers;
s6, oil filling hole making: marking a phi 8mm oil injection hole at the shaft body end with the phi 23mm, then drilling a phi 8mm through hole according to the marking position, wherein the through hole is the oil injection hole, and removing burrs to finish the processing and manufacturing of the connecting rod;
(2) processing of the electrode:
s1, preparing materials: selecting a T2 red copper material as a raw material for manufacturing an electrode, wherein the T2 red copper material is phi 30x250 mm;
s2 turning worker once rough processing: fixing the selected electrode raw material on a power output mechanism of a lathe, cutting the electrode raw material to enable two end faces of the electrode raw material to be flat, ensuring that the length of the electrode raw material meets the design requirement before cutting, then manufacturing a shaft body with the outer circle diameter of phi 27mm, manufacturing a cutting groove with the diameter of phi 16mm on the manufactured shaft body, and finally manufacturing a M16x1.5mm thread on the cutting groove;
s3, turning for secondary fine treatment: the roughly processed electrode is arranged on the flat end face of the connecting rod to form a rotating shaft, then the rotating shaft is clamped on a lathe, the shaft body with the diameter of phi 27mm of the excircle is finely processed to the shaft body with the diameter of phi 24.5mm of the excircle, the jumping quantity and the coaxiality are ensured to be within 0.02mm, and the sharp edge is rounded to R0.3mm;
s4 wire cutting treatment: firstly, cutting a reference plane on a shaft body with the outer circle of phi 24.5mm, wherein the width of the manufactured reference plane is required to be 14mm, then manufacturing internal teeth, wherein the tooth tops are required to be vertical to the reference plane, controlling the directions of feeding, discharging and retracting of wire cutting, and respectively cutting two internal teeth with different specifications to form electrodes;
(3) processing the triangular spline:
s1 machine setting: setting corresponding parameters in advance for a machine tool for machining, and selecting relevant parameters of machining depth, current, voltage, high-voltage conditions, electric arc, lift and polarity according to machining conditions of the triangular spline;
s2, clamping a product: the method for machining the large triangular spline by using the electrode comprises the following steps: aligning from the transverse direction and the longitudinal direction respectively, wherein the perpendicularity in the two directions is less than or equal to 0.02mm, then aligning a 10x12mm large triangular spline electrode, the straightness of a 14mm wide reference surface is less than or equal to 0.02mm, the parallelism of a bottom surface is less than or equal to 0.02mm, and finally aligning the center of a phi 4.5 excircle; the specific direction for processing the small triangular spline by using the electrode is as follows: firstly, aligning a small triangular spline electrode, wherein the straightness of a 14mm wide reference surface is less than or equal to 0.02mm, the parallelism of a bottom surface is less than or equal to 0.02mm, the small triangular spline electrode corresponds to the large triangular spline electrode to form a coaxial center, the 14mm wide reference surface is used as a reference, then aligning the center of an excircle with the diameter of 4.5mm, and ensuring that the center lines of two splines are superposed;
and S3 triangular spline machining: after the product is clamped, the central lines of the large spline and the small spline after the rotating shaft is clamped are coincided, and finally, the spline is processed according to requirements.
Further, the processing method of the invention, wherein in the processing of the connecting rod in the step (1), the S3 thermal refining is carburizing, quenching and annealing.
Further, in the processing method of the electrode in the step (2), in the processing process of the electrode in the step (2), wherein the small internal teeth and the large internal teeth processed by the S4 wire cutting are the same in external structure, the small internal teeth of the specification of 8x10mm are cut and formed, and then the large internal teeth of the specification of 10x12mm are cut and formed, that is, the corresponding small triangular spline electrode and the corresponding large triangular spline electrode are formed.
Further, in the processing method of the triangular spline in the step (3), the specific method for clamping and aligning the S2 product is to use a dial indicator to align the center of the electrode from the front direction, the rear direction, the left direction and the right direction; and the adopted chuck is a three-jaw chuck or a four-jaw chuck.
Compared with the prior art, the processing method for processing the triangular spline of the rotating shaft by utilizing the electric spark has the effective effects that: by utilizing the electric spark machining principle, the two triangular splines arranged on the rotating shaft are machined, so that the product can meet the standard requirement, the use requirement of a user can be met, the delivery cycle of the product can be finished in advance, the machining efficiency is improved, and the manufacturing cost of an enterprise is correspondingly reduced. The processing method is easy to operate, can be popularized and applied to processing of various complex parts, and is suitable for popularization and application.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of a spindle part to be machined according to the present invention;
FIG. 2 is a schematic view of a connecting rod constructed in accordance with the present invention;
FIG. 3 is a schematic view of an electrode structure processed in accordance with the present invention;
FIG. 4 is a schematic view of the small triangular spline structure processed by the present invention;
FIG. 5 is a schematic view of a large triangular spline structure processed by the present invention;
FIG. 6 is a schematic structural diagram of a spindle part after being processed by the present invention.
Detailed Description
To further illustrate the inventive concepts of the present invention, specific embodiments of the present invention will be described further below with reference to the accompanying drawings in which:
as shown in fig. 1 to 6, the processing method for processing a rotating shaft triangular spline by using electric spark according to the present invention mainly includes processing a connecting rod, processing an electrode, and processing the triangular spline, and specifically includes the following processing steps:
(1) processing the connecting rod:
s1, preparing materials: selecting 45 # round steel as a raw material for manufacturing the connecting rod, wherein the specification of the raw material of the 45 # round steel is phi 30x115mm, and the number of the raw material is one piece;
s2 turning worker once rough processing: flattening two end faces to ensure the length of the two end faces, and manufacturing central positioning holes A2 on the two end faces; then, roughly cutting the outer wall of the shaft body, carrying out crown turning on two sections of shaft necks with the outer circles of phi 13mm and shaft bodies with the outer circles of phi 25mm according to the design length requirement, then drilling an inner hole with the diameter of phi 14mm on the shaft body with the outer circle diameter of phi 25mm along the axial direction of the shaft body, ensuring that the depth of the inner hole meets the design requirement, and forming a hole chamfer angle of 1mmx30 degrees at the front end of the inner hole;
s3, quenching and tempering, namely quenching and tempering the connecting rod after once turning, wherein the quenching and tempering refers to carburizing, quenching and annealing, the heated size of the connecting rod can change after quenching and tempering, and the connecting rod after quenching and tempering is cooled to normal temperature;
s4, turning for secondary fine treatment: the connecting rod after thermal refining is firstly subjected to orifice chamfering and shaft neck end central positioning hole A2 with the diameter of phi 13mm of the excircle in an inner hole, then is fixed on a power output mechanism of a lathe, and is subjected to finish machining on two sections of shaft necks and shaft bodies with the diameters of phi 13mm and phi 25mm, and the shaft necks and the shaft bodies with the diameters of phi 12mm and phi 23mm are machined;
s5, manufacturing a threaded bottom hole: clamping the connecting rod after the fine treatment on a lathe, clamping and fixing and aligning by utilizing an excircle, controlling the jumping quantity of the connecting rod to be less than or equal to 0.02mm and the flat end surface to be 0.5mm, boring a phi 18mm cavity in an inner hole of a phi 23mm shaft body end, boring an M16x1.5mm threaded bottom hole in the bored cavity, and manufacturing threads and chamfers;
s6, oil filling hole making: firstly, marking, namely marking a phi 8mm oil injection hole at the shaft body end with the diameter of 23mm, performing bench worker treatment, namely drilling a phi 8mm through hole at the marking position, wherein the through hole is the oil injection hole, and removing burrs to finish the processing and manufacturing of the connecting rod; and finally, performing general inspection, inspecting according to drawings and process rules, and delivering after the inspection is qualified.
(2) Processing of the electrode:
s1, preparing materials: selecting a T2 red copper material as a raw material for manufacturing the electrode, wherein the T2 red copper raw material is phi 30x250mm, and the total number of the raw materials is 10;
s2 turning worker once rough processing: fixing the selected electrode raw material on a power output mechanism of a lathe, cutting the electrode raw material to enable two end faces of the electrode raw material to be flat, ensuring that the length of the electrode raw material meets the design requirement before cutting, then manufacturing a shaft body with the outer circle diameter of phi 27mm, manufacturing a cutting groove with the diameter of phi 16mm on the manufactured shaft body, and finally manufacturing a M16x1.5mm thread on the cutting groove;
s3, turning for secondary fine treatment: the roughly processed electrode is arranged on the flat end face of the connecting rod to form a rotating shaft, then the rotating shaft is clamped on a lathe, the shaft body with the diameter phi 27 of the excircle is finely processed to the shaft body with the diameter phi 24.5 of the excircle, the jumping quantity and the coaxiality are ensured to be within 0.02mm, and the sharp edge is rounded R0.3mm;
s4 wire cutting treatment: firstly, cutting a reference plane on a shaft body with the outer circle of phi 24.5mm, wherein the width of the manufactured reference plane is required to be 14mm, then manufacturing internal teeth, wherein the tooth tops are required to be vertical to the reference plane, controlling the feeding, discharging and retracting directions of line cutting, respectively cutting Q/3A0-8-8x10 and Q/3A0-8-10x12 internal teeth for forming, cutting 5 pieces, and dividing the two internal teeth with different specifications into small internal teeth and large internal teeth to form corresponding small triangular spline electrodes and large triangular spline electrodes, finally performing general inspection, inspecting according to drawings and process rules, and delivering after the inspection is qualified.
(3) Processing the triangular spline:
s1 machine setting: setting corresponding parameters in advance for a machine tool for machining, and selecting relevant parameters of machining depth, current, voltage, high-voltage conditions, electric arc, lift and polarity according to machining conditions of the triangular spline;
s2, clamping a product: the specific clamping method for machining the large triangular spline by using the electrode comprises the following steps: respectively aligning the perpendicularity in the two directions a and b to be less than or equal to 0.02mm, namely the transverse direction and the longitudinal direction, then aligning the corresponding large triangular spline electrodes, namely Q/3A0-8-10x12, wherein the straightness of a 14mm wide reference surface is less than or equal to 0.02mm, the parallelism of the bottom surface is less than or equal to 0.02mm, and finally aligning the excircle center of phi 4.5 mm. Meanwhile, the specific clamping method for machining the small triangular spline by using the electrode comprises the following steps: firstly, aligning corresponding small triangular spline electrodes, namely Q/3A0-8-8x10 electrodes, wherein the straightness of a 14mm wide reference plane is less than or equal to 0.02mm, the bottom surface parallelism is less than or equal to 0.02mm, the reference plane is Q/3A0-8-10x12 and the 14mm wide reference plane is used as a reference, then aligning the center of an excircle with the diameter of 4.5mm, and ensuring that the center lines of the two splines are overlapped. The specific method for alignment is that a dial indicator is adopted to align the center of the electrode from the front direction, the back direction, the left direction and the right direction; and the adopted chuck is a three-jaw chuck or a four-jaw chuck.
And S3 triangular spline machining: after the product is clamped, the central lines of the large spline and the small spline after the rotating shaft is clamped are coincided, and finally, the spline is processed according to requirements. Finally, performing general inspection, inspecting according to a drawing and a process rule, and delivering after the inspection is qualified.
The protection scope of the present invention is not limited to the technical solutions disclosed in the specific embodiments, the above description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, and any minor modifications, equivalent substitutions and improvements made according to the technical solutions of the present invention should be included in the protection scope of the technical solutions of the present invention.
Claims (4)
1. A processing method for processing a triangular spline of a rotating shaft by utilizing electric spark is characterized by mainly comprising the steps of processing a connecting rod, processing an electrode and processing the triangular spline, and specifically comprises the following processing steps:
(1) processing the connecting rod:
s1, preparing materials: selecting 45 # round steel as a raw material for manufacturing the connecting rod, wherein the raw material of the 45 # round steel is phi 30x115 mm;
s2 turning worker once rough processing: fixing the selected connecting rod raw material on a power output mechanism of a lathe, cutting the connecting rod raw material to enable two end faces of the connecting rod raw material to be flat, ensuring that the length of the connecting rod raw material meets the design requirement before cutting, and manufacturing central positioning holes on the two end faces; then, roughly cutting the outer wall of the shaft body, manufacturing two sections of shaft necks with the diameter phi of 13mm and shaft bodies with the diameter phi of 25mm according to the design length requirement, then drilling an inner hole with the diameter phi of 14mm on the shaft bodies with the diameter phi of 25mm along the axial direction of the shaft bodies to ensure that the depth of the inner hole meets the design requirement, and manufacturing a hole chamfer angle of 1mmx30 degrees at the front end of the inner hole;
s3, quenching and tempering, namely quenching and tempering the connecting rod after primary turning, wherein the heated size of the connecting rod is changed after quenching and tempering, and the quenched and tempered connecting rod is cooled to normal temperature;
s4, turning for secondary fine treatment: repairing an orifice chamfer and one central positioning hole in an inner hole of the connecting rod subjected to thermal refining, then finely machining two sections of shaft necks and shaft bodies with the outer circle diameters of phi 13mm and phi 25mm on a power output mechanism fixed on a lathe, and machining the shaft necks and the shaft bodies to the outer circle diameters of phi 12mm and phi 23 mm;
s5, manufacturing a threaded bottom hole: clamping the connecting rod after the fine treatment on a lathe, clamping and fixing and aligning by utilizing an excircle, controlling the jumping quantity of the connecting rod to be less than or equal to 0.02mm and the flat end surface to be 0.5mm, boring a phi 18mm cavity in an inner hole of a phi 23mm shaft body end, boring an M16x1.5mm threaded bottom hole in the bored cavity, and manufacturing threads and chamfers;
s6, oil filling hole making: marking a phi 8mm oil injection hole at the shaft body end with the diameter of 23mm, drilling a phi 8mm through hole which is the oil injection hole according to the marking position, and removing burrs to finish the processing and manufacturing of the connecting rod;
(2) processing of the electrode:
s1, preparing materials: selecting a T2 red copper material as a raw material for manufacturing an electrode, wherein the T2 red copper material is phi 30x250 mm;
s2 turning worker once rough processing: fixing the selected electrode raw material on a power output mechanism of a lathe, cutting the electrode raw material to enable two end faces of the electrode raw material to be flat, ensuring that the length of the electrode raw material meets the design requirement before cutting, then manufacturing a shaft body with the outer circle diameter of phi 27mm, manufacturing a cutting groove with the diameter of phi 16mm on the manufactured shaft body, and finally manufacturing a M16x1.5mm thread on the cutting groove;
s3, turning for secondary fine treatment: the roughly processed electrode is arranged on the flat end face of the connecting rod to form a rotating shaft, then the rotating shaft is clamped on a lathe, the shaft body with the diameter of phi 27mm of the excircle is finely processed to the shaft body with the diameter of phi 24.5mm of the excircle, the jumping quantity and the coaxiality are ensured to be within 0.02mm, and the sharp edge is rounded to R0.3mm;
s4 wire cutting treatment: firstly, cutting a reference plane on a shaft body with the outer circle of phi 24.5mm, wherein the width of the manufactured reference plane is required to be 14mm, then manufacturing internal teeth, wherein the tooth tops are required to be vertical to the reference plane, controlling the directions of feeding, discharging and retracting of wire cutting, and respectively cutting two internal teeth with different specifications to form electrodes;
(3) processing the triangular spline:
s1 machine setting: setting corresponding parameters in advance for a machine tool for machining, and selecting relevant parameters of machining depth, current, voltage, high-voltage conditions, electric arc, lift and polarity according to machining conditions of the triangular spline;
s2, clamping a product: the method for machining the large triangular spline by using the electrode comprises the following steps: aligning from the transverse direction and the longitudinal direction respectively, wherein the perpendicularity in the two directions is less than or equal to 0.02mm, aligning the corresponding electrodes to ensure that the straightness of a 14mm wide reference surface is less than or equal to 0.02mm, the parallelism of the bottom surface is less than or equal to 0.02mm, and finally, aligning the center of an excircle; the specific method for processing the small triangular spline by using the electrode comprises the following steps: aligning corresponding electrodes, namely aligning the straightness of a 14mm wide reference surface to be less than or equal to 0.02mm and the parallelism of the bottom surface to be less than or equal to 0.02mm, corresponding to the other electrode, taking the 14mm wide reference surface as a reference, aligning the center of an excircle, and ensuring that the center lines of the two splines are superposed;
and S3 triangular spline machining: after the product is clamped, the central lines of the large spline and the small spline after the rotating shaft is clamped are coincided, and finally, the spline is processed according to requirements.
2. The processing method according to claim 1, characterized in that: in the step (1), in the processing of the connecting rod, S3 thermal refining refers to carburizing, quenching and annealing.
3. The processing method according to claim 1, characterized in that: in the processing process of the electrode in the step (2), wherein the small internal teeth and the large internal teeth processed by the S4 wire cutting are the same in external structure, the small internal teeth with the specification of 8x10mm are cut and formed, and then the large internal teeth with the specification of 10x12mm are cut and formed, so that the corresponding small triangular spline electrode and the corresponding large triangular spline electrode are formed.
4. The processing method according to claim 1, characterized in that: in the processing process of the triangular spline in the step (3), the specific method for clamping and aligning the S2 product is to use a dial indicator to align the center of the electrode from the front direction, the back direction, the left direction and the right direction; and the adopted chuck is a three-jaw chuck or a four-jaw chuck.
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