Motor rotor machining method and system

Abstract

The invention belongs to the technical field of motor processing. The invention provides a motor rotor machining method and system, and the method comprises the steps: carrying out the rough machining of an iron core gear of a shaft material blank, so as to guarantee the concentricity of a rotating shaft which is connected into a rotor iron core in series; sleeving the rotating shaft subjected to rough machining into the rotating shaft iron core, and pressing the rotating shaft in place by using a pressing machine; integrally processing the outer circle of the rotor core and the outer circle of the rotating shaft; reversely and finely turning the excircle of the iron core and the excircle of the rotating shaft; a rotating shaft key groove is milled; and accurately grinding the excircles of the rotating shaft and the rotor core. According to the motor rotor machining method, the rotating shaft is connected into the rotor iron core in series and then is integrally machined, the concentricity of the rotor can be effectively ensured, after turning of the outer circle of the rotor, grinding machining of the outer circle of the rotor is added, surface machining burrs are removed through grinding, and the product machining quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motor processing, and in particular to a motor rotor processing method and system. Background Art

[0002] The motor rotor is composed of a shaft and a stator core. The motor rotor is usually machined on the shaft first, including rough turning, fine turning, keyway milling, and grinding of the shaft bearing and shaft extension. The machined shaft is then assembled with the rotor core. After assembly, the outer circle of the rotor core is machined and the rotor dynamic balancing test is performed. Since the outer circle of the rotor has burrs after machining, pickling is required to remove the surface burrs. The main problems in its machining are as follows:

[0003] 1. The shaft processing and rotor processing are carried out in different processing units, and manual flow is used between each process. The flow efficiency is low, and multiple clamping affects product quality;

[0004] 2. After the shaft is processed, the shaft will deviate from the center when it is pressed into the rotor core. The rotor after press-fitting is only processed on the outer circle of the rotor core, which makes it difficult to ensure the coaxiality of the rotor.

[0005] 3. After the outer circle of the rotor core is processed, aluminum whiskers and burrs will be attached to the surface. They can be removed by pickling, burning and oxidation, but the consistency of quality is difficult to guarantee. It is easy to cause the burrs to be not removed cleanly, or excessive pickling will cause the air gap between the stator and rotor to become larger. Summary of the invention

[0006] The purpose of the present invention is to provide a motor rotor processing method and system to solve the problems of low efficiency and difficulty in ensuring quality consistency in existing motor rotor processing methods.

[0007] The present invention provides a method for machining a motor rotor, the method comprising:

[0008] Rough machining of the core block of the shaft blank is performed to ensure the concentricity of the shaft in the rotor core;

[0009] Insert the roughly machined shaft into the shaft core and press the shaft into place with a press;

[0010] Integral machining of the outer circle of the rotor core and the outer circle of the shaft;

[0011] Reverse finishing of the outer circle of the core and the outer circle of the shaft;

[0012] Milling shaft keyway;

[0013] Fine grinding of the shaft and the outer circle of the rotor core.

[0014] The motor rotor processing method mentioned above inserts the rotating shaft into the rotor core and then processes the whole motor, which can effectively ensure the concentricity of the rotor. After the rotor outer circle turning process, the rotor outer circle grinding process is added to remove the surface processing burrs by grinding, thereby improving the product processing quality.

[0015] Furthermore, the method for rough machining the core block of the shaft material blank comprises:

[0016] The core stage of the shaft blank is roughly processed by a CNC lathe, wherein the cutting speed of the CNC lathe is 150-180 m / min and the feed rate is 0.2-0.3 mm / r.

[0017] Furthermore, before the step of inserting the roughly machined rotating shaft into the rotating shaft core, the method further comprises:

[0018] The rotor core is heated to 250-300℃ using medium frequency heating.

[0019] Furthermore, the method for integrally processing the outer circle of the rotor core and the outer circle of the shaft comprises:

[0020] A vertical machining center is used to integrally machine the outer circle of the rotor core and the outer circle of the shaft.

[0021] Furthermore, the method of integrally machining the outer circle of the rotor core and the outer circle of the shaft using a vertical machining center comprises:

[0022] Rough turning of the outer circle of the rotor core, cutting speed 150-180m / min, feed rate 0.2-0.3mm / r;

[0023] Rough turning of the outer circle of the rotor shaft, cutting speed 120-150m / min, feed rate 0.2-0.3mm / r.

[0024] Furthermore, the method for reverse finishing the outer circle of the core and the outer circle of the shaft comprises:

[0025] Finish turning the outer circle of the rotor core, cutting speed 100-120m / min, feed rate 0.1-0.2mm / r;

[0026] Finish turning the outer circle of the rotor shaft, cutting speed 100-120m / min, feed rate 0.1-0.2mm / r.

[0027] Furthermore, the method for milling a shaft keyway comprises:

[0028] Complete the milling of the keyway at the shaft extension end on a CNC milling machine.

[0029] Furthermore, the method for fine grinding the outer circle of the rotating shaft and the rotor core comprises:

[0030] Grind the outer circle of the shaft on a CNC grinder, using a 20mm wide grinding wheel, with a grinding depth of 0.02mm each time:

[0031] The outer circle of the core is ground on a CNC grinder using a 50mm wide grinding wheel with a grinding depth of 0.01mm each time.

[0032] The present invention also provides a motor rotor processing system, which includes a manipulator, a rough turning CNC lathe arranged on one side of the manipulator, a rotating shaft feeding conveyor line arranged on one side of the rough turning CNC machine tool, a rotor core feeding turntable arranged on one side of the rotating shaft feeding conveyor line, a press arranged on the upper side of the rotor core feeding turntable, a fine turning CNC lathe arranged on one side of the rotor core feeding turntable, a CNC milling machine arranged on one side of the fine turning CNC lathe, and a CNC external cylindrical grinder arranged on one side of the CNC milling machine.

[0033] Furthermore, the precision turning CNC lathe is a dual-spindle CNC lathe. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a flow chart of a motor rotor processing method in a first embodiment of the present invention;

[0035] Figure 2 FIG. 4 is a top view of a motor rotor processing system according to a second embodiment of the present invention.

[0036] Description of main component symbols:

[0037]

[0038] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0039] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0040] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0042] See also Figure 1 , an embodiment of the present invention provides a motor rotor processing method, the method comprising steps S01 to S06:

[0043] Step S01, rough machining the core block of the shaft blank to ensure the concentricity of the rotating shaft in the rotor core;

[0044] Step S02, inserting the roughly machined rotating shaft into the rotating shaft core, and pressing the rotating shaft into place with a press;

[0045] Step S03, integrally processing the outer circle of the rotor core and the outer circle of the shaft;

[0046] Step S04, reverse finishing of the outer circle of the core and the outer circle of the shaft;

[0047] Step S05, milling the shaft keyway;

[0048] Step S06, fine grinding of the shaft and the outer circle of the rotor core.

[0049] The motor rotor processing method mentioned above inserts the rotating shaft into the rotor core and then processes the whole motor, which can effectively ensure the concentricity of the rotor. After the rotor outer circle turning process, the rotor outer circle grinding process is added to remove the surface processing burrs by grinding, thereby improving the product processing quality.

[0050] In one embodiment of the present invention, the method for rough machining the core block of the shaft blank comprises:

[0051] The core block of the shaft blank is roughly processed by a CNC lathe, and the cutting speed of the CNC lathe is 150-180m / min and the feed rate is 0.2-0.3mm / r. Processing within this parameter range can ensure the initial formation of the core block of the shaft blank while ensuring the processing efficiency, providing a basic guarantee for the concentricity of the subsequent shaft being strung into the rotor core.

[0052] In one embodiment of the present invention, before the step of inserting the roughly machined rotating shaft into the rotating shaft core, the method further comprises:

[0053] The rotor core is heated to 250-300°C by medium frequency heating. Specifically, the rotor core will expand to a certain extent after heating. At this time, the shaft is inserted and pressed into place by a press. The principle of thermal expansion and contraction can be used to form a closer fit between the shaft and the rotor core, thereby improving the assembly accuracy.

[0054] In one embodiment of the present invention, the method for integrally processing the outer circle of the rotor core and the outer circle of the shaft comprises: integrally processing the outer circle of the rotor core and the outer circle of the shaft using a vertical machining center. The method for integrally processing the outer circle of the rotor core and the outer circle of the shaft using a vertical machining center comprises: rough turning the outer circle of the rotor core, cutting speed 150-180m / min, feed rate 0.2-0.3mm / r; rough turning the outer circle of the rotor shaft, cutting speed 120-150m / min, feed rate 0.2-0.3mm / r. Integral processing can reduce the cumulative error caused by step-by-step processing and ensure the overall accuracy and surface quality of the outer circle of the rotor core and the outer circle of the shaft.

[0055] In one embodiment of the present invention, the method for reverse finishing of the outer circle of the core and the outer circle of the shaft comprises: finishing the outer circle of the rotor core, cutting speed 100-120m / min, feed rate 0.1-0.2mm / r; finishing the outer circle of the rotor shaft, cutting speed 100-120m / min, feed rate 0.1-0.2mm / r. Reverse finishing further improves the dimensional accuracy and surface finish of the outer circle of the rotor core and the outer circle of the shaft, meeting the high-precision requirements of the motor rotor.

[0056] In one embodiment of the present invention, the method for milling a shaft keyway comprises:

[0057] The keyway at the shaft extension end is milled on a CNC milling machine. The CNC milling machine can accurately control the position and size of the milling, ensure the accuracy and quality of the keyway, and provide a reliable interface for the connection between the motor rotor and other components.

[0058] In one embodiment of the present invention, the method of fine grinding the outer circle of the rotating shaft and the rotor core comprises: grinding the outer circle of the rotating shaft on a CNC grinder, using a 20mm wide grinding wheel, and grinding 0.02mm each time; grinding the outer circle of the core on a CNC grinder, using a 50mm wide grinding wheel, and grinding 0.01mm each time. Fine grinding further improves the surface quality and dimensional accuracy of the outer circle of the rotating shaft and the rotor core, reduces surface roughness, and improves the performance of the motor rotor.

[0059] The above motor rotor processing method effectively improves the processing accuracy of the motor rotor by accurately controlling the process parameters of each processing link, such as cutting speed, feed rate, grinding amount, etc., and adopting methods such as overall processing and reverse finishing. It ensures the concentricity of the shaft and the rotor core, reduces the vibration and noise during the operation of the motor, and improves the stability and service life of the motor. The method of heating the rotor core by medium frequency and then pressing the shaft is adopted, and the principle of thermal expansion and contraction is used to form a close fit between the shaft and the rotor core, which improves the assembly quality and reduces the possibility of loosening, displacement and other problems during the operation of the motor.

[0060] See also Figure 2 An embodiment of the present invention provides a motor rotor processing system, the system comprising a manipulator 10, a rough turning CNC lathe 20 arranged on one side of the manipulator 10, a shaft feeding conveyor line 30 arranged on one side of the rough turning CNC lathe 20, a rotor core feeding turntable 40 arranged on one side of the shaft feeding conveyor line 30, a press 50 arranged on the upper side of the rotor core feeding turntable 40, a fine turning CNC lathe 60 arranged on one side of the rotor core feeding turntable 40, a CNC milling machine 70 arranged on one side of the fine turning CNC lathe 60, and a CNC cylindrical grinder 80 arranged on one side of the CNC milling machine 70.

[0061] The above-mentioned motor rotor processing system, through the manipulator 10, grabs the rotating shaft on the rotating shaft feeding conveyor line 30, places it on the rough turning CNC machine tool 20, and completes the rough processing of the rotating shaft core gear; then manually places the rotor core on the rotor core feeding turntable 40 station, the upper side of the rotor core feeding turntable 40 is provided with a medium frequency heating device 41, the rotor core feeding turntable 40 station is rotated to the heating station of the medium frequency heating device 41, and the rotor core is heated to 250-300 degrees Celsius; then the manipulator 10 grabs the rotating shaft after rough turning, and places it on the inner circle of the rotor core on the rotor core feeding turntable 40; then the rotor core feeding turntable 40 is rotated to the press 50 station, the press head of the press 50 descends, and the rotating shaft and the rotor core are assembled into a rotor; then The rear manipulator 10 grabs the rotor after press-fitting, places it on the workstation 1 of the fine-turning CNC lathe 60, and performs rough machining of the outer circle of the rotor, including the outer circle of the rotor core and the outer circle of the shaft; at the same time, the manipulator 10 grabs the rotor after rough turning, places it on the workstation 2 of the fine-turning CNC lathe 60, and performs fine machining of the outer circle of the rotor, including the outer circle of the rotor core and the outer circle of the shaft; then the manipulator 10 grabs the rotor after fine turning, places it on the CNC milling machine 70, and performs keyway milling; then the manipulator 10 grabs the milled rotor, places it on the CNC external cylindrical grinder 80, and performs grinding of the outer circle of the rotor, including grinding of the outer circle of the rotor core and the outer circle of the shaft; finally, the manipulator 10 grabs the ground rotor, places it on the unloading conveyor line 90, and the rotor is unloaded.

[0062] In one embodiment of the present invention, the CNC finishing lathe 60 is a dual-spindle CNC lathe.

[0063] The above motor rotor processing system, the reasonable layout of the motor rotor processing system and the optimized configuration of the equipment, as well as the application of the dual-spindle CNC lathe, have improved production efficiency. The short material transportation path and close cooperation between equipment have reduced production time and cost. At the same time, the improvement of the degree of automation has reduced manual operation, reduced human errors, and improved product consistency and reliability.

[0064] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A motor rotor processing method, characterized in that: The method comprises: Rough machining of the core block of the shaft blank is performed to ensure the concentricity of the shaft in the rotor core; Insert the roughly machined shaft into the shaft core and press the shaft into place with a press; Integral machining of the outer circle of the rotor core and the outer circle of the shaft; Reverse finishing of the outer circle of the core and the outer circle of the shaft; Milling shaft keyway; Fine grinding of the shaft and the outer circle of the rotor core.

2. The motor rotor processing method according to claim 1, characterized in that: The method for rough machining the core block of the shaft material blank comprises: The core stage of the shaft blank is roughly processed by a CNC lathe, wherein the cutting speed of the CNC lathe is 150-180 m / min and the feed rate is 0.2-0.3 mm / r.

3. The motor rotor processing method according to claim 1, characterized in that: Before the step of inserting the roughly processed rotating shaft into the rotating shaft core, the method further comprises: The rotor core is heated to 250-300℃ using medium frequency heating.

4. The motor rotor processing method according to claim 1, characterized in that: The method for integrally processing the outer circle of the rotor core and the outer circle of the rotating shaft comprises: A vertical machining center is used to integrally machine the outer circle of the rotor core and the outer circle of the shaft.

5. The motor rotor processing method according to claim 4, characterized in that: The method of integrally machining the outer circle of the rotor core and the outer circle of the rotating shaft by using a vertical machining center comprises: Rough turning of the outer circle of the rotor core, cutting speed 150-180m / min, feed rate 0.2-0.3mm / r; Rough turning of the outer circle of the rotor shaft, cutting speed 120-150m / min, feed rate 0.2-0.3mm / r.

6. The motor rotor processing method according to claim 1, characterized in that: The method for reverse finishing the outer circle of the core and the outer circle of the shaft comprises: Finish turning the outer circle of the rotor core, cutting speed 100-120m / min, feed rate 0.1-0.2mm / r; Finish turning the outer circle of the rotor shaft, cutting speed 100-120m / min, feed rate 0.1-0.2mm / r.

7. The motor rotor processing method according to claim 1, characterized in that: The method for milling a rotating shaft keyway comprises: Complete the milling of the keyway at the shaft extension end on a CNC milling machine.

8. The motor rotor processing method according to claim 1, characterized in that: The method for fine grinding the outer circle of the rotating shaft and the rotor core comprises: Grind the outer circle of the shaft on a CNC grinder, using a 20mm wide grinding wheel, with a grinding depth of 0.02mm each time: The outer circle of the core is ground on a CNC grinder using a 50mm wide grinding wheel with a grinding depth of 0.01mm each time.

9. A motor rotor processing system, characterized in that: The system includes a manipulator, a rough turning CNC lathe arranged on one side of the manipulator, a rotating shaft feeding conveyor line arranged on one side of the rough turning CNC machine tool, a rotor core feeding turntable arranged on one side of the rotating shaft feeding conveyor line, a press arranged on the upper side of the rotor core feeding turntable, a fine turning CNC lathe arranged on one side of the rotor core feeding turntable, a CNC milling machine arranged on one side of the fine turning CNC lathe, and a CNC cylindrical grinder arranged on one side of the CNC milling machine.

10. The motor rotor processing system according to claim 9, characterized in that: The precision turning CNC lathe is a double-spindle CNC lathe.

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