The press-fitting process is the most widely used and widely used in motor assembly. Such as pressing the bearing to the rotor, pressing the circlip, pressing the silicon steel sheet to the rotor, pressing the commutator, pressing the bearing to the housing, etc. In the motor assembly industry, many processes such as commutator bushings, motor output shaft end bearings, rotor stator assembly, motor shaft core press-in, motor end covers and bearing assembly require the use of Xintaiming intelligent servo presses and precision servo presses. .
In motor assembly lines, servo press automation is just one way to improve product efficiency. But in fact, to improve the quality of motor assembly, more attention needs to be paid to the realization of the process during the assembly process. In the entire motor assembly process, in addition to the unique assembly processes of the motor such as magnetization, dynamic balancing, winding, etc., there are also several traditional processes such as press-fitting, oil injection, welding, etc.
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The advantages of using servo presses for motor press installation
Xintaiming servo presses are driven by servo motors Driving high-precision roller screws to perform precision pressure assembly, testing and other operations can achieve full-process closed-loop control of the press-fitting force and press-in depth during pressure assembly and detection, thereby achieving precision press-fitting for online quality management. Precision, intelligence, accuracy, full program control.
The servo press adopts servo drive and PLC control system to realize full closed-loop control of force and displacement. It is a digital control equipment for interference assembly.
The servo press collects data on the relationship between force and position 2,000 times per second from press installation to quality inspection and quality control. The pressure accuracy is 5‰FS, and the full-stroke positioning accuracy is ±0.01mm.
Process:
For motor production, the bearing is pressed into the ring, using a two-stage press-fit process, first position mode pre-pressing, and then pressure mode press-fitting.
Quality detection:
Use window detection, in which the first two windows use position detection mode, and the third window uses pressure detection mode.
Press fitting performance:
The precise position and pressure closed-loop algorithm can achieve:
1. The position accuracy within the stroke reaches ±0.01mm (within the rated load) at any speed).
2. When the pressure reaches within 5‰FS, combined with a customized electric cylinder, it can help users eliminate mold guide bushings, limits, etc., simplify tooling fixtures, and is especially suitable for the production of small batches and multiple varieties of products.
Advantages of using servo presses for motor press-fitting
Quality control:
Multiple judgment modes, real-time monitoring of pressure and displacement changes during the production process, automatic Determining whether the press-fit product is qualified can eliminate the quality inspection process after press-fit, effectively reducing labor costs and providing a foundation and guarantee for fully automated press-fit production.
1. Can effectively identify unexpected situations such as incoming material tolerances exceeding limits and processing process coordination errors.
2. Ensure whether the product is qualified by testing the end pressure range and end position range.
Data mining:
1. It can be connected with MES to realize electronic SOP function and improve production efficiency by more than 20%.
2. All process, quality, and production data during the production process can be automatically extracted and uploaded to provide technical guarantee for subsequent traceability, statistics, and analysis.
Data processing part:
PLC: The collection frequency is not high, key data is easily lost, and only simple detection can be done.
PC and capture card: The collection frequency is high, and the detection requirements can be designed as needed. Disadvantages: High requirements for programmers' abilities. (For example, I require that the wave front value should not exceed 1/3 of the wave peak setting value during the entire pressing process. When 1/5 of the wave peak and valley values ??exceed 3, it is considered unqualified. This program is difficult to program.)
Specialized force and displacement monitor: Integrated control card, built-in part of the judgment program, can be used directly.
Introduction to force and displacement monitoring curves:
In many press-fitting situations, most use the relationship curve to monitor the relationship between the press-fitting force and the press-fitting stroke.