CN114473396A - Machining method of eccentric gear - Google Patents
Machining method of eccentric gear Download PDFInfo
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- CN114473396A CN114473396A CN202210211832.2A CN202210211832A CN114473396A CN 114473396 A CN114473396 A CN 114473396A CN 202210211832 A CN202210211832 A CN 202210211832A CN 114473396 A CN114473396 A CN 114473396A
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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
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
Abstract
The invention discloses a method for processing an eccentric gear, which specifically comprises the following steps: step one, obtaining a main plate blank, a gear ring blank and an eccentric body blank; step two, processing the gear ring blank to form a gear ring, wherein a welding groove is formed on the surface of an inner ring of the gear ring; processing the eccentric body blank to form an eccentric body assembly, wherein the eccentric body assembly comprises an eccentric ring and an eccentric body fixedly connected with the surface of the outer ring of the eccentric ring; processing the main board blank to form a main board; welding the main board and the gear ring; welding the main board welded with the gear ring and the eccentric body assembly; and step five, forming tooth shapes on the surface of the outer ring of the gear ring. The eccentric gear, the gear ring, the main plate, the eccentric body assembly and other parts manufactured by the processing method provided by the embodiment of the invention are welded by different materials, so that the hardness and the wear resistance of the gear ring are improved and the production cost of the main plate is reduced on the premise of ensuring that the use strength is not reduced.
Description
Technical Field
The invention belongs to the technical field of gear machining, and particularly relates to a machining method of an eccentric gear.
Background
The eccentric gear is one of key parts of the mechanical press, and the manufacturing precision of the eccentric gear directly influences the motion precision of a slide block of the mechanical press, so that the whole machine work of the mechanical press is influenced.
In a traditional mechanical press, an eccentric gear is integrally cast and molded by steel made of QT750-4, but the ring gear of the eccentric gear is low in strength, poor in wear resistance and short in service life. However, if the welding process is not reasonable, the service life of the welded large gear is often shortened due to welding flaws of the gear, which is not favorable for long-time stable use of the large welded gear.
Disclosure of Invention
In view of the above problems, the present invention provides a method for processing an eccentric gear, which overcomes or at least partially solves the above problems, and the technical solution is as follows:
a method for machining an eccentric gear, comprising:
step one, obtaining a main plate blank, a gear ring blank and an eccentric body blank;
step two, processing the gear ring blank to form a gear ring, wherein a welding groove is formed on the surface of an inner ring of the gear ring; processing the eccentric body blank to form an eccentric body assembly, wherein the eccentric body assembly comprises an eccentric ring and an eccentric body fixedly connected with the surface of the outer ring of the eccentric ring; processing the main board blank to form a main board;
step three, heating the gear ring to a first set temperature, maintaining the temperature at the heat preservation temperature, filling a welding groove in the gear ring with a first welding rod, and annealing; heating the gear ring and the main board to a first set temperature, maintaining the temperature at the heat preservation temperature, mounting the main board on an auxiliary component, sleeving an inner ring of the gear ring on an outer ring of the main board, heating the first welding rod, welding the gear ring and the main board, and carrying out annealing treatment;
heating the eccentric body assembly and the main board to a first set temperature, maintaining the temperature at a heat preservation temperature, and mounting the main board on an auxiliary element; sleeving the inner ring of the main plate on the outer ring of the eccentric ring, inserting a second welding rod between the eccentric ring and the main plate, heating the second welding rod, welding the eccentric ring and the main plate, and annealing;
and step five, processing the main board, the gear ring and the eccentric body assembly which are connected together by welding, and forming a tooth shape on the surface of the outer ring of the gear ring.
The method above, optionally, wherein the auxiliary element comprises a rotatable disc; the mounting the main board on the auxiliary includes: and placing the main board on the disc, and driving the main board to rotate around the geometric center of the main board when the disc rotates.
Optionally, in the method, when the gear ring and the main board are welded in the third step, a welding point is arranged on the outer ring of the main board, the disc is rotated for a circle, and a first welding rod arranged around the outer ring of the main board is heated, so that the gear ring and the main board are welded.
Optionally, in the method, when the eccentric ring and the main plate are welded in the fourth step, a welding point is arranged on the inner ring of the main plate, the disk is rotated for a circle, and a second welding rod arranged around the inner ring of the main plate is heated, so that the eccentric ring and the main plate are welded.
Optionally, the first welding rod is an H08Mn2SiA welding wire, and the welding temperature of the first welding rod is 180-220 ℃; the first set temperature is 300-350 ℃.
Optionally, in the above method, the first step further includes obtaining a blank of a reinforcing rib plate; the second step also comprises the step of processing the reinforcing rib plate blank to form a reinforcing rib plate; heating the reinforcing rib plate and the main board to a first set temperature, maintaining the temperature at a heat preservation temperature, placing the reinforcing rib plate on the plane of the main board, inserting a second welding rod between the reinforcing rib plate and the main board, heating the second welding rod, welding the reinforcing rib plate and the main board, and carrying out annealing treatment;
the maintaining at the holding temperature includes: and setting an infrared thermometer to measure the workpiece needing heat preservation in real time, and when the temperature of the workpiece needing heat preservation is lower than the heat preservation temperature, heating the workpiece needing heat preservation, and keeping the temperature of the workpiece needing heat preservation before welding to be not lower than the heat preservation temperature.
In the above method, optionally, the processing the gear ring blank to form the gear ring includes:
and carrying out rough turning on the gear ring blank to form an outer ring of the gear ring, an inner ring of the gear ring and the welding groove.
In the above method, optionally, the processing the eccentric body blank to form an eccentric body assembly includes:
and carrying out rough turning on the eccentric body blank to form an outer ring of the eccentric ring and an inner ring of the eccentric ring.
Optionally, in the fifth step, the processing is performed on the main plate, the gear ring and the eccentric body assembly which are welded together, and a tooth form is formed on the surface of the outer ring of the gear ring, where the tooth form includes:
finely turning the inner ring of the eccentric ring, the outer ring of the gear and two end faces of the gear;
and after gear hobbing rough machining and gear grinding finish machining are sequentially carried out on the surface of the outer ring of the gear ring, tooth surface quenching is carried out, and the tooth form of the surface of the outer ring of the gear ring is formed after annealing.
In the above method, optionally, the gear ring blank is made of 42CrMo steel, the eccentric body blank is made of ZG270-500 cast steel, and the main plate blank and the reinforcing rib plate blank are made of Q235 steel or Q230 steel.
Compared with the prior art, the invention has the following advantages: the eccentric gear, the gear ring, the main plate, the eccentric body assembly and other parts manufactured by the processing method provided by the embodiment of the invention are formed by welding different materials, so that on the premise of ensuring that the use strength is not reduced, the hardness and the wear resistance of the gear ring are improved, the production cost of the main plate is reduced, and the eccentric gear has the characteristics of stable structure, wear resistance and long service life.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a method flowchart of a method for machining an eccentric gear according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a main plate in a method for processing an eccentric gear according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a welded main plate and a welded ring gear in a third step of the method for machining an eccentric gear according to the embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an eccentric body assembly in a method for machining an eccentric gear according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram obtained by welding the main plate and the gear ring and then welding the main plate and the eccentric body assembly in the fourth implementation step in the processing method of the eccentric gear according to the embodiment of the present invention;
fig. 6 is another schematic structural diagram obtained by welding the main plate and the gear ring and then welding the main plate and the eccentric body assembly in the step four in the method for processing the eccentric gear according to the embodiment of the present invention;
the main plate comprises a main plate 1, a main plate 11, a main plate outer ring 12, a main plate inner ring 2, reinforcing ribs 3, a gear ring 31, a gear ring outer ring 32, a gear ring inner ring 4, an eccentric body assembly 41, an eccentric ring 411, an eccentric ring 412, an eccentric ring inner ring 42.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Referring to fig. 1, a method flowchart of a method for processing an eccentric gear according to an embodiment of the present invention is shown, and an implementation process of the method shown in fig. 1 is a feasible implementation scheme of the method for processing an eccentric gear according to an embodiment of the present invention, and the method for processing an eccentric gear specifically includes:
s101: and acquiring a main plate blank, a gear ring blank and an eccentric body blank.
In the method provided by the embodiment of the invention, the material of the gear ring blank can be 42CrMo steel, and the rolling piece blank for forming the gear ring blank is made of high-quality vacuum deoxidation steel ingots. In the rolling process, the annular workpiece forms a hole pattern through a driving roll and a core roll; deoxidation is a reaction for reducing the oxygen content in steel in the steel making and casting processes, and is an important process link for ensuring the quality of steel ingots and steel products; in the method provided by the embodiment of the invention, the blank of the rolled part is subjected to quenching and tempering by high-temperature tempering, and the Boolean hardness of the blank is preferably up to 240-280. In the method provided by the embodiment of the invention, the flaw detection of the ring rolling piece for forming the gear ring blank preferably reaches the second level of the metallurgical standard or the third level of the national standard, and the ring rolling piece has no defects of pores, shrinkage porosity, cracks and the like.
In the method provided by the embodiment of the invention, the eccentric body blank can be made of ZG270-500 cast steel, the casting requires annealing treatment, and the hardness is as follows: 140 HB and 190 HB; and the casting piece is required to meet the requirements of the GB/T11352 common engineering cast carbon steel standard, and casting defects such as air holes, shrinkage porosity, slag inclusion, cracks, sand adhesion and the like influencing the strength and the use are avoided.
In the method provided by the embodiment of the invention, the main plate blank material can be Q235 steel or Q230 steel, and the steel plate needs to be flat.
S102: processing each blank before welding, specifically including:
processing the main plate blank to form the main plate 1, and referring to fig. 2, the structural schematic diagram of the main plate in the processing method of the eccentric gear provided by the embodiment of the invention is shown, and the processing of the main plate blank in the second step includes rough turning the main plate blank to form an outer ring 11 of the main plate and an inner ring 12 of the main plate, wherein the outer ring 11 of the main plate is matched with the inner ring of the gear ring, and the inner ring 12 of the main plate is matched with the outer ring of the eccentric ring in the eccentric body assembly. Optionally, the size of the main board 1 in the embodiment is 2222mm in outer diameter, 2014mm in inner diameter, and 240mm in thickness.
And processing the gear ring blank to form a gear ring 3, wherein the processing comprises rough turning, and the gear ring blank is subjected to rough turning to form an outer ring 31 of the gear ring, an inner ring 32 of the gear ring and a welding groove on the surface of the inner ring 32 of the gear ring, wherein the welding groove cannot have the defects of impurities, air holes and the like, and the annealing treatment for eliminating welding stress is needed after welding. A welding groove is formed in the surface of the inner ring 32 of the gear ring, a first welding rod is filled in the welding groove, the gear ring inner ring 32 is sleeved on the main board outer ring 11, the gear ring and the main board can be welded together by heating the first welding rod, and a structural schematic diagram after the gear ring and the main board are welded in the third process in the processing method of the eccentric gear provided by the embodiment of the invention is shown by referring to fig. 4. Optionally, the dimensions of the gear ring 3 in the embodiment are outer diameter 2014mm, inner diameter 482mm and thickness 80 mm.
Processing the eccentric body blank to form an eccentric body assembly 4, wherein the eccentric body assembly 4 comprises an eccentric ring 41 and an eccentric body 42 fixedly connected with the outer ring surface of the eccentric ring; referring to fig. 3, a schematic structural diagram of an eccentric body assembly in a method for machining an eccentric gear according to an embodiment of the present invention is shown. In the second step, the eccentric body blank is processed to form the eccentric body assembly 4, including size processing, such as rough turning of the eccentric body blank, to form the outer ring 411 of the eccentric ring and the inner ring 412 of the eccentric ring. Alternatively, the outer diameter of the eccentric body 42 is 1160mm, the inner diameter of the eccentric ring 41 is 310mm, the thickness of the eccentric ring 41 is 885mm, and the eccentricity (which can be interpreted as the distance from the center of the eccentric ring 41 to the center of the eccentric body 42 in this embodiment) is 350 mm.
In the method provided by the embodiment of the invention, the processed eccentric gear can be applied to the eccentric gear of the double-point press, and the net weight of the two eccentric gears can reach 5.5t multiplied by 2.
S103: and welding the main board and the gear ring, and the method comprises the following steps: heating the gear ring to a first set temperature, maintaining the temperature at the heat preservation temperature, filling a welding groove in the gear ring with a first welding rod, and annealing; and then heating the gear ring and the main board to a first set temperature, maintaining the temperature at the temperature, mounting the main board on an auxiliary component, sleeving the inner ring of the gear ring on the outer ring of the main board, heating the first welding rod, filling the connecting welding line between the main board and the gear ring with the first welding rod, welding the gear ring and the main board, and carrying out annealing treatment.
S104: will the mainboard with the eccentric body closes the piece and carries out welded connection, include: heating the eccentric body assembly and the main board to a first set temperature, maintaining the temperature at a heat preservation temperature, and mounting the main board on an auxiliary element; sleeving the inner ring of the main plate on the outer ring of the eccentric ring, inserting a second welding rod into a connecting welding seam between the eccentric ring and the main plate, heating the second welding rod, welding the eccentric ring and the main plate, and carrying out annealing treatment. Referring to fig. 5 and fig. 6, a schematic structural diagram of a gear ring, a main plate, and an eccentric body assembly welded in the process of implementing step four in the method for processing an eccentric gear according to an embodiment of the present invention is shown, where fig. 5 is a front view, fig. 6 is a right view, fig. 6 (a) is a structure of the eccentric body assembly, fig. 6 (b) is a structure of the eccentric body assembly, the main plate, and the gear ring after welding, and the welding is implemented between an eccentric ring outer ring 411 and a main plate inner ring 11, and between a gear ring inner ring 32 and the main plate outer ring 11.
In the method provided by the embodiment of the invention, the auxiliary piece comprises a rotatable disc; in the third and fourth steps, the operation of mounting the main board on the auxiliary member specifically includes placing the main board on the disk, so that the disk can drive the main board to rotate around the geometric center of the main board when rotating. If the disc is horizontally arranged, the main board can be directly arranged on the disc; if the disk is vertically placed or in order to tightly fix the main board and the disk, the main board can be clamped on the disk.
In the method provided by the embodiment of the invention, through the arrangement of the rotatable disk, when the gear ring and the main board are welded in the third step, only one welding point is arranged on the outer ring of the main board, and then the first welding rod arranged around the outer ring of the main board can be heated by rotating the disk for one circle, so that the gear ring and the main board are welded. The rotatable discs are arranged, so that the arrangement quantity of welding spots is reduced, convenience is brought to welding operation, and the welding process of the main board and the gear ring can be completed at one time; in the conventional welding process, part of the workpiece is welded firstly, then the workpiece is turned over, and the rest part of the workpiece is welded, so that the process is complicated, time-consuming and labor-consuming.
In the method provided by the embodiment of the invention, similarly, by arranging the rotatable disk, when the eccentric ring and the main plate are welded in the fourth step, only one welding point is arranged on the inner ring of the main plate, and the second welding rod arranged around the inner ring of the main plate can be heated by rotating the disk for one circle, so that the welding process of the eccentric ring and the main plate can be completed at one time.
In the method provided by the embodiment of the invention, a plurality of reinforcing rib plates can be welded on the main plate to further improve the stability of the structure, namely, the first step further comprises the step of obtaining a reinforcing rib plate blank, wherein the material of the reinforcing rib plate blank can be selected to be the same as that of the main plate blank, namely the material of the reinforcing rib plate blank can also be selected to be Q235 steel or Q230 steel; the second step also comprises the step of processing the reinforcing rib plate blank to form a reinforcing rib plate, wherein the processing comprises the processing of size and shape; in the third step, the main plate and the gear ring are welded, and the main plate and each reinforcing rib plate are welded, and the step can be performed after the main plate and the gear ring are welded.
In the method provided by the embodiment of the invention, the step three of welding the main board and each reinforcing rib plate comprises the following steps: heating the reinforcing rib plates and the main board to a first set temperature, maintaining the temperature at the heat preservation temperature, placing the reinforcing rib plates at the corresponding positions of the plane of the main board determined after analysis, inserting second welding rods into connecting welding seams between the reinforcing rib plates and the main board, heating the second welding rods, welding the reinforcing rib plates and the main board, and carrying out annealing treatment. Referring to fig. 4, a schematic structural diagram after welding the gear ring and the main plate, and the reinforcing rib plate and the main plate in the process of implementing step three in the processing method of the eccentric gear provided by the embodiment of the present invention is shown.
In the method provided by the embodiment of the present invention, the method of preserving heat of the workpiece to be preserved in the heat preservation temperature includes: and arranging an infrared thermometer to measure the workpiece needing heat preservation in real time, and when the temperature of the workpiece needing heat preservation is measured to be lower than the heat preservation temperature, heating the workpiece needing heat preservation, and keeping the temperature of the workpiece needing heat preservation before welding to be not lower than the heat preservation temperature.
In the method provided by the embodiment of the invention, the first welding rod for welding the gear ring and the main board can adopt an H08Mn2SiA welding wire, and by matching with the materials and the structures of the main board and the gear ring adopted by the invention, the performances of the welded main board and the welded gear ring on stability and wear resistance can be optimized, and the service life of the machined eccentric gear is prolonged. The temperature of the H08Mn2SiA welding wire is 180-220 ℃ during welding, and oxygen can be used for heating and heat preservation before welding; in the method provided by the embodiment of the invention, the first set temperature is the preheating temperature and can be set to be 300-350 ℃.
In the method provided by the embodiment of the invention, the welding of the main plate and the eccentric body combined piece and the welding of the main plate and each reinforcing rib plate can be carried out by adopting a common welding rod, so that the production cost and the structural stability are balanced. In addition, the processing method provided by the embodiment of the invention has the advantages that the preheating and the heat preservation are carried out in the welding process, so that the possibility of crack generation in the welding process is reduced; and the influence of welding stress is reduced by annealing after welding.
In the method provided by the embodiment of the invention, chamfering treatment is carried out on all the edges after welding, the chamfering refers to the processing of cutting the edges of the workpiece into a certain inclined plane, and the chamfering is used for removing burrs generated on the part due to machining and is also convenient for part assembly.
S105: and after welding is finished, machining the main plate, the gear ring and the eccentric body assembly which are connected together by welding, and forming a tooth form on the surface of the outer ring of the gear ring.
In the method provided by the embodiment of the present invention, the specific operations of step five include: finish turning the inner ring of the eccentric ring, the outer ring of the gear and two end faces of the gear can be finished in a vertical lathe.
In the method provided by the embodiment of the present invention, the specific operations of step five further include: and after gear hobbing rough machining and gear grinding finish machining are sequentially carried out on the surface of the outer ring of the gear ring, tooth surface quenching is carried out, and the tooth form of the surface of the outer ring of the gear ring is formed after annealing. The hobbing and gear grinding can finish the processing of tooth shapes on a gear machine tool, and the hobbing processing is to process gears by utilizing a hob and utilizing a generating method principle, belongs to rough processing and is used for forming; the tooth profile of the gear is obtained through hobbing processing and is often subjected to finish machining. The quenching hardness of the tooth surface is 40-45HRC, the quenching depth can be not less than 3mm, and then low-temperature annealing is carried out. The gear is left with a grinding position, the tooth direction is controlled according to the drum shape amount of 0.015mm during grinding, and the tooth shape is controlled according to the drum shape amount of 0.025 mm.
In the method provided by the embodiment of the invention, the gear ring, the main plate, the eccentric body assembly and the reinforcing rib plate all require acute-angle blunting, namely, an angle smaller than 90 degrees is processed into an angle larger than 90 degrees, so that the angle is smoother.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A method for machining an eccentric gear, comprising:
step one, obtaining a main plate blank, a gear ring blank and an eccentric body blank;
step two, processing the gear ring blank to form a gear ring, wherein a welding groove is formed on the surface of an inner ring of the gear ring; processing the eccentric body blank to form an eccentric body assembly, wherein the eccentric body assembly comprises an eccentric ring and an eccentric body fixedly connected with the surface of the outer ring of the eccentric ring; processing the main board blank to form a main board;
step three, heating the gear ring to a first set temperature, maintaining the temperature at the heat preservation temperature, filling a welding groove in the gear ring with a first welding rod, and annealing; heating the gear ring and the main board to a first set temperature, keeping the temperature at the first set temperature, mounting the main board on an auxiliary component, sleeving an inner ring of the gear ring on an outer ring of the main board, heating the first welding rod, welding the gear ring and the main board, and annealing;
heating the eccentric body assembly and the main board to a first set temperature, maintaining the temperature at a heat preservation temperature, and mounting the main board on an auxiliary element; sleeving the inner ring of the main plate on the outer ring of the eccentric ring, inserting a second welding rod between the eccentric ring and the main plate, heating the second welding rod, welding the eccentric ring and the main plate, and annealing;
and step five, processing the main board, the gear ring and the eccentric body assembly which are connected together by welding, and forming a tooth shape on the surface of the outer ring of the gear ring.
2. The method of claim 1, wherein the auxiliary element comprises a rotatable disc; the mounting the main board on the auxiliary includes: and placing the main board on the disc, and driving the main board to rotate around the geometric center of the main board when the disc rotates.
3. The method of claim 2, wherein in the third step, when the ring gear and the main plate are welded, a welding point is provided on the outer ring of the main plate, and the first welding rod surrounding the outer ring of the main plate is heated by rotating the disc for one circle, so as to complete the welding of the ring gear and the main plate.
4. The method of claim 2, wherein in the fourth step, when welding the eccentric ring and the main plate, a welding point is provided on the inner ring of the main plate, and the disc is rotated once to heat a second welding rod surrounding the inner ring of the main plate, thereby completing the welding of the eccentric ring and the main plate.
5. The method of claim 1, wherein the first electrode is a H08Mn2SiA wire, and the first electrode has a welding temperature of 180 ℃ to 220 ℃; the first set temperature is 300-350 ℃.
6. The method according to claim 1, wherein the first step further comprises obtaining a stiffener blank; the second step also comprises the step of processing the reinforcing rib plate blank to form a reinforcing rib plate; heating the reinforcing rib plate and the main board to a first set temperature, maintaining the temperature at a heat preservation temperature, placing the reinforcing rib plate on the plane of the main board, inserting a second welding rod between the reinforcing rib plate and the main board, heating the second welding rod, welding the reinforcing rib plate and the main board, and carrying out annealing treatment;
the maintaining at the holding temperature includes: and arranging an infrared thermometer to measure the workpiece needing heat preservation in real time, and when the temperature of the workpiece needing heat preservation is measured to be lower than the heat preservation temperature, heating the workpiece needing heat preservation, and keeping the temperature of the workpiece needing heat preservation before welding to be not lower than the heat preservation temperature.
7. The method of claim 1, wherein said machining said ring gear blank to form a ring gear comprises:
and carrying out rough turning on the gear ring blank to form an outer ring of the gear ring, an inner ring of the gear ring and the welding groove.
8. The method of claim 1, wherein said machining said eccentric blank to form an eccentric pack comprises:
and carrying out rough turning on the eccentric body blank to form an outer ring of the eccentric ring and an inner ring of the eccentric ring.
9. The method of claim 1, wherein in the fifth step, the main plate, the gear ring and the eccentric body assembly which are welded together are processed to form a tooth shape on the outer ring surface of the gear ring, and the method comprises the following steps:
finely turning the inner ring of the eccentric ring, the outer ring of the gear and two end faces of the gear;
and after gear hobbing rough machining and gear grinding finish machining are sequentially carried out on the surface of the outer ring of the gear ring, tooth surface quenching is carried out, and the tooth form of the surface of the outer ring of the gear ring is formed after annealing.
10. The method according to claim 1 or 5, wherein the material of the gear ring blank is 42CrMo steel, the material of the eccentric body blank is ZG270-500 cast steel, and the material of the main plate blank and the reinforcing plate blank is Q235 steel or Q230 steel.
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