CN108406245B - Manufacturing method of light new energy automobile driving motor rotating shaft - Google Patents
Manufacturing method of light new energy automobile driving motor rotating shaft Download PDFInfo
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- CN108406245B CN108406245B CN201810524172.7A CN201810524172A CN108406245B CN 108406245 B CN108406245 B CN 108406245B CN 201810524172 A CN201810524172 A CN 201810524172A CN 108406245 B CN108406245 B CN 108406245B
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- rotating shaft
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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
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
- B23P2700/50—Other automobile vehicle parts, i.e. manufactured in assembly lines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Extrusion Of Metal (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
The invention discloses a manufacturing method of a rotating shaft of a driving motor of a lightweight new energy automobile, which comprises the following steps of 1) blanking; 2) placing the pipe material in a first-order extrusion die, penetrating a core shaft into an inner hole of the pipe material, and extruding an inner circular hole and an outer circular surface at the right end of a motor rotating shaft; 3) the blank is placed in a second-order extrusion die, and a step mandrel is adopted to extrude two outer circumferential surfaces of the right end surface and the right end surface of the motor rotating shaft in a step shape; 4) placing the heated or locally heated blank in a third-order extrusion die, and extruding an outer circle and an inner hole at the left end of a rotating shaft of the motor by adopting a third mandrel and a warm pier at the heating temperature of 900 +/-50 ℃; 5) finish turning left end surface steps, and 6) external spline gear rolling processing. According to the manufacturing method, the tube material is subjected to multi-pass precision extrusion forming, so that the purposes of hollowing and light weight of the electrode rotating shaft are achieved; the utilization rate of materials can be greatly improved, and the self weight of the motor rotating shaft is reduced; the hole forming precision is high, and the machining cost is effectively reduced.
Description
Technical Field
The invention relates to a manufacturing method of a rotating shaft of a driving motor of a new energy automobile, in particular to a manufacturing process method of a rotating shaft of a driving motor of a lightweight new energy automobile.
Background
The new energy automobile power core is a driving motor, a motor rotating shaft mainly plays a role in rotor iron core fixing and torque transmission, the torque is transmitted to the rotating shaft through a rotor by the motor output power, a spline at the end of the motor rotating shaft is connected with an input shaft of a transmission to play an effective power transmission role, the motor torque is transmitted to the transmission, and the transmission is subjected to speed change processing and then output to a power component behind the transmission. Because the bearing torque of the motor rotating shaft is very large and reaches 200-350N meters, the diameter of the rotating shaft is correspondingly larger, the diameter is usually increased to phi 50-80 mm in the existing structure, but the diameter is increased, the weight of the rotating shaft is also correspondingly increased, great adverse effects are generated on the transmission of power and rotation of the rotating shaft, and the self weight of the rotating shaft needs to be reduced; in the prior art, the weight of the rotating shaft is reduced by drilling the center hole, but after the motor rotating shaft is formed, the center hole is drilled by machining, so that more materials are wasted, and the utilization rate of the materials is reduced; secondly, the machining time is long, and the machining cost of the rotating shaft is increased; in addition, the machining mode is adopted, for some motor rotating shafts with special requirements, such as a structure with a large middle inner hole and small holes at two ends, the inner hole can not be machined by adopting the machining mode of drilling and boring, the matching and mounting structure is limited, and the application range of the motor rotating shaft is limited; therefore, the existing machining modes of the motor rotating shaft and the drilling and boring cannot meet the market requirements.
Disclosure of Invention
Aiming at the defects of the existing motor rotating shaft and the machining mode of drilling and boring, the invention provides a manufacturing process of the light-weight new energy automobile driving motor rotating shaft, so that the utilization rate of materials is increased, the machining cost of the motor rotating shaft is reduced, and the market requirement is met.
The technical scheme of the invention is as follows: a manufacturing method of a rotating shaft of a driving motor of a light new energy automobile is characterized by comprising the following steps:
1) preparing a steel pipe material; blanking according to the process requirement to obtain a pipe material with the required length;
2) first-order precise cold extrusion: placing a pipe material in a first-order extrusion die, and penetrating a core shaft into an inner hole of the pipe material, wherein the diameter of the core shaft is adapted to the diameter of an inner hole of a motor rotating shaft; extruding an inner circular hole and an outer circular surface at the right end of the motor rotating shaft;
3) second-order precise cold extrusion: placing the blank after the first-order extrusion in a second-order extrusion die, and extruding two stepped outer circumferential surfaces of the right end surface and the right end surface of the motor rotating shaft by adopting a stepped mandrel;
4) and a third step of local heating and pier-warming extrusion: heating the blank extruded in the second procedure, or locally heating the left end of the blank, locally heating the left end of the rotating shaft of the motor at 900 +/-50 ℃, placing the locally heated blank in a third-procedure extrusion die, and extruding the outer circle and the inner hole of the left end of the rotating shaft of the motor by using a third mandrel and a warm pier;
5) step size turning in the fourth process: clamping the blank after the third-step extrusion into a chuck of a numerical control lathe,
positioning the outer circumferential surface and the end surface, finely turning the step on the left end surface,
6) and performing subsequent gear rolling processing on the external spline according to the process requirements to obtain external spline teeth meeting the process requirements on the surface of the blank.
Further features are: and (3) lubricating the surface of the discharged pipe material, heating the pipe material to 70-80 ℃, heating the macromolecular lubricant to 50-60 ℃, soaking for a period of time, and drying.
In the third precision cold extrusion procedure, the blank is placed in the third precision cold extrusion die in an inverted manner, and the placing direction of the blank in the second precision cold extrusion procedure is opposite to that of the blank in the second precision cold extrusion procedure.
The pipe material is a seamless steel pipe.
After step 6, subsequent machining and heat treatment, if necessary, are carried out according to the process requirements.
The manufacturing method of the light new energy automobile driving motor rotating shaft has the following advantages:
1. the manufacturing method of the light-weight new energy automobile driving motor rotating shaft achieves the purposes of hollowing and light-weight the electrode rotating shaft by performing multi-pass precision extrusion forming on the pipe material.
2. The utilization rate of materials can be greatly improved, and the dead weight of the motor rotating shaft is reduced.
3. The inner hole of the steel pipe is basically not required to be processed through multi-pass precision extrusion forming, the hole forming precision is high, and the machining cost is effectively reduced.
4. The hollow shaft cavity is a motor rotating shaft with a large middle part and small two ends, so that smooth molding can be realized, and higher precision can be ensured; but the prior art can not realize the mode of boring by machining and drilling.
Drawings
FIG. 1 is a sectional view of a conventional solid motor shaft structure;
FIG. 2 is a sectional view of the structure of the rotating shaft of the hollow motor of the present invention;
FIG. 3-1 is a view of a tube blank being blanked in accordance with the present invention; FIG. 3-2 is a schematic view of a first sequence of cold extrusion and initial die configuration; 3-3 are schematic views of a first sequence of cold extrusion finishing structures;
FIG. 4-1 is a drawing of the process steps after the first cold extrusion of the present invention; FIG. 4-2 is a schematic view of a second sequence of cold extrusion and initial die configuration; 4-3 are schematic views of a second sequence of cold extrusion completed structures;
FIG. 5-1 is a schematic view of the blank after a second stage cold extrusion of the present invention; FIG. 5-2 is a schematic view of a third sequence of warm pier extrusion and initial die structure; FIG. 5-3 is a schematic view of a third sequence of the hot-block extrusion completion structure;
fig. 6-1 is a schematic view of the blank after the fourth sequence of machining of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments;
as shown in fig. 1, the conventional motor rotating shaft is limited by the processing technology and difficulty, and an inner hole is not designed, so that the middle part is of a solid structure, and more raw materials are consumed; and adopt drilling among the prior art bore hole etc. machining mode, lead to the cost higher etc..
As shown in figure 2, the hollow motor rotating shaft obtained by the invention is provided with a central inner hole, the cavity of the inner hole is large in the middle part and small in two ends, the diameter of the cylinder body positioned in the middle part is the largest, and the diameter of the inner hole of the cylinder body is increased, so that the wall thickness of the cylinder body is basically uniform with the wall thickness of other parts; the structure with the basically uniform wall thickness cannot be processed by adopting the machining drilling and boring modes in the prior art.
As shown in fig. 3-1, 3-2, 3-3, 4-1, 4-2, 4-3, 5-1, 5-2, 5-3 and 6-1, the manufacturing method of the lightweight new energy automobile driving hollow motor rotating shaft comprises the following steps:
1. preparing a steel pipe material, namely a seamless steel pipe with a proper size, preferably a low-carbon alloy steel material, wherein the hardness reaches HB 130-150;
blanking according to the process requirement to obtain a pipe material with the required length; blanking by using a high-speed circular saw, calculating and blanking a pipe material with a certain length according to the geometric dimensions of the motor rotating shaft, such as length, width and the like, by combining the inner radius and the outer radius of the seamless steel pipe and according to the forming principle that the volume is not changed;
lubricating the surface of the pipe material according to the process requirement; the invention provides a specific surface lubrication treatment mode which comprises the following steps: and (3) performing macromolecular lubrication treatment, heating the pipe material to 70-80 ℃, heating the macromolecular lubricant to 50-60 ℃, soaking for a period of time, such as 20-60 seconds, and then drying. The polymeric lubricant is a conventional lubricant and will not be further described.
2. First-order precise cold extrusion: placing a pipe material in a first-order extrusion die, and penetrating a first mandrel into an inner hole of the pipe material, wherein the diameter and the shape of the mandrel are adapted to the diameter of the inner hole of the motor rotating shaft and are manufactured according to the process requirement, and the first-order extrusion die is manufactured according to the process requirement; extruding an inner circular hole and an outer circular surface at the right end of the motor rotating shaft, namely an outer circle at the right end shown in figure 2; the mode of penetrating a mandrel into an inner hole of a pipe material ensures that the inner diameter is not deformed, the diameter of the right end of the mandrel is reduced, and an inner circular hole and an outer circular surface at the right end of a rotating shaft of the motor are formed by reducing and extruding to ensure the size of the inner hole; see figures 3-2 and 3-3 for details.
3. Second-order precise cold extrusion: and (3) placing the blank extruded in the first procedure in an extrusion die in a second procedure, and extruding two stepped outer circumferential surfaces (two small outer circles) on the right end surface and the right end surface of the motor rotating shaft by adopting a stepped second mandrel. The step-shaped second mandrel and the second-order extrusion die are manufactured according to the process requirements; see figures 4-2 and 4-3 for details.
4. And a third step of local heating and pier-warming extrusion: heating the blank extruded in the second procedure, or locally heating the left end of the blank, namely locally heating the left end of the rotating shaft of the motor at 900 +/-50 ℃, wherein the length of the heated end surface is more than or equal to 60mm, placing the heated or locally heated blank in a third-procedure extrusion die, and extruding the excircle and the inner hole of the left end of the rotating shaft of the motor by using a third mandrel and a warm pier; the step adopts a mandrel to ensure the size of an inner hole, limit the excircle, reduce the extrusion outer diameter of a pier, and ensure the size of the excircle and the size of the inner hole. In this process, the blank is placed upside down in the third-stage extrusion die, i.e., in the direction opposite to the direction in which the blank is placed in the second-stage precision cold extrusion process. The third mandrel and the third-order extrusion die are manufactured according to the process requirements; see figures 5-2 and 5-3 for details.
5. Step size turning in the fourth process: the blank after the third-step extrusion is clamped into a lathe chuck,
positioning the outer circumferential surface and the end surface, and finely turning the left end surface step. The lathe is preferably an advanced numerically controlled lathe to improve machining efficiency and accuracy, etc., as shown in detail in fig. 6-1.
6. And (4) carrying out subsequent machining of the external spline according to the process requirements, such as gear rolling machining, so as to achieve 6-grade accuracy of the spline (GB/T2478-1995).
7. And the subsequent machining and heat treatment process is the same as that of the traditional motor rotating shaft and can be carried out according to the process requirements.
The key processing steps of the invention are the first to third precision warm pier and cold extrusion processes, and the outer circumferential surface, the left and right end surfaces, the inner hole and the like of the motor rotating shaft are extruded through the three precision extrusion steps; because the core shaft is adopted in the extrusion step, the size of the inner hole is stable, and the required precision and geometric size can be achieved without machining treatment such as boring and the like.
Through the steps, according to the manufacturing method provided by the invention, the light-weight new energy automobile driving hollow motor rotating shaft meeting the process requirements can be obtained, the wall thickness is uniform, the cavity of the inner hole is large in the middle part and small in two ends, the diameter of the cylinder body positioned in the middle part is the largest, the diameter of the inner hole of the cylinder body is correspondingly increased, the wall thickness of the cylinder body is equal to (basically uniform) that of other parts, a structure with basically uniform wall thickness is formed, and the requirement of the motor rotating shaft for transmitting power torque is met.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and although the present invention has been described in detail by referring to the preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention can be made without departing from the spirit and scope of the technical solutions, and all the modifications and equivalent substitutions should be covered by the claims of the present invention.
Claims (3)
1. A method for manufacturing a rotating shaft of a driving motor of a light new energy automobile is characterized in that a cavity of an inner hole of the rotating shaft of the motor is large in the middle part and small in two ends, and the diameter of a cylinder body positioned in the middle part is the largest; the method is characterized by comprising the following steps:
1) preparing a steel pipe material; blanking according to the process requirement to obtain a pipe material with the required length; lubricating the surface of the tube material after blanking, heating the tube material to 70-80 ℃, heating the macromolecular lubricant to 50-60 ℃, soaking for a period of time, and then drying;
2) first-order precise cold extrusion: placing a pipe material in a first-order extrusion die, and penetrating a core shaft into an inner hole of the pipe material, wherein the diameter of the core shaft is adapted to the diameter of an inner hole of a motor rotating shaft; extruding an inner circular hole and an outer circular surface at the right end of the motor rotating shaft;
3) second-order precise cold extrusion: placing the blank after the first-order extrusion in a second-order extrusion die, and extruding two stepped outer circumferential surfaces of the right end surface and the right end surface of the motor rotating shaft by adopting a stepped mandrel;
4) and a third step of local heating and pier-warming extrusion: heating the blank extruded in the second procedure, or locally heating the left end of the blank at 900 +/-50 ℃, placing the heated or locally heated blank in a third-procedure extrusion die, and extruding an outer circle and an inner hole at the left end of a motor rotating shaft by adopting a third mandrel and a warm pier;
in the third-order warm pier extrusion procedure, the blank is placed in a third-order extrusion die in an inverted mode, and the placing direction of the blank is opposite to that of the blank in the second-order precise cold extrusion procedure;
5) step size turning in the fourth process: the blank after the third-step extrusion is clamped into a lathe chuck,
positioning the outer circumferential surface and the end surface, finely turning the step on the left end surface,
6) and (4) carrying out subsequent external spline machining according to the process requirements, and obtaining external spline teeth meeting the process requirements on the surface of the blank.
2. The manufacturing method of the rotating shaft of the driving motor of the light-weight new energy automobile according to claim 1, characterized by comprising the following steps: the pipe material is a seamless steel pipe.
3. The manufacturing method of the rotating shaft of the driving motor of the light-weight new energy automobile according to claim 1 or 2, characterized by comprising the following steps: after step 6, subsequent machining and heat treatment, if necessary, are carried out according to the process requirements.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810524172.7A CN108406245B (en) | 2018-05-28 | 2018-05-28 | Manufacturing method of light new energy automobile driving motor rotating shaft |
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| CN201810524172.7A CN108406245B (en) | 2018-05-28 | 2018-05-28 | Manufacturing method of light new energy automobile driving motor rotating shaft |
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| CN108406245A CN108406245A (en) | 2018-08-17 |
| CN108406245B true CN108406245B (en) | 2020-08-25 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109732277A (en) * | 2018-12-17 | 2019-05-10 | 菲仕绿能科技(北京)有限公司 | A kind of processing method of driving motor hollow rotating shaft |
| CN110091138A (en) * | 2019-06-18 | 2019-08-06 | 常熟希那基汽车零件有限公司 | A kind of novel hollow production method of shaft |
| CN110900122B (en) * | 2019-11-12 | 2021-06-25 | 武汉科技大学 | Lightweight motor shaft forming method |
| CN111106707A (en) * | 2019-11-12 | 2020-05-05 | 武汉科技大学 | Motor shaft suitable for new energy automobile |
| CN111001984A (en) * | 2019-12-10 | 2020-04-14 | 广州小出钢管有限公司 | Manufacturing process of rotating shaft of seat angle adjuster |
| CN114101570A (en) * | 2021-12-02 | 2022-03-01 | 江苏攀森智能科技有限公司 | Machining method of motor rotating shaft |
| CN116288189A (en) * | 2023-03-29 | 2023-06-23 | 洛阳汇晶新材料科技有限公司 | Rotary target extrusion equipment and binding method of rotary target and back tube |
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| CN103350346B (en) * | 2013-07-06 | 2016-06-08 | 江苏威鹰机械有限公司 | Power takeoff driving shaft cold closed-die forging plastic forming technique |
| CN104148888B (en) * | 2014-06-30 | 2016-06-29 | 宁波惠山汽配制造有限公司 | The cold extruding formation process of isolator splined sleeve |
| CN105108456B (en) * | 2015-08-31 | 2017-07-21 | 重庆创精温锻成型有限公司 | The manufacture method of new-energy automobile motor axle |
| CN105344735B (en) * | 2015-11-30 | 2018-02-13 | 玉环普天单向器有限公司 | A kind of cold extrusion molding mould and moulding process of the output shaft with endoporus |
| CN107138926A (en) * | 2017-06-20 | 2017-09-08 | 江苏威鹰机械有限公司 | Automobile CVT automatic transmission guide wheel shaft manufacturing process |
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