Was established in 1998, is a collection of r & dproduction, trade as one of the high-tech company, the company specializes in manufacturing various micro-motor shaft...
Was established in 1998, is a collection of r &d production, trade as one of the high-tech company, the company specializes in manufacturing various micro-motor shaft...
Our machine including large CNC lathe, CNC machining center, CNC centerless grinding machine, CNC Incisive grinding machine, CNC cylindrical grinding machine, heat treatment machine.
Talking about the structural craftability of the motor shaft
Sufficient strength and rigidity are prerequisites for safe and reliable operation of the motor shaft. Especially for large and medium-sized motors, they should be rigorously checked or demonstrated according to actual working conditions. motor shaft However, in addition to this, the motor shaft structure processability must also be taken seriously when designing the motor shaft, which is often overlooked, which seriously affects the machining accuracy and processing efficiency. Ms. Participate in this topic today to talk about how to determine the structural parameters of the shaft.
The cutting amount of the shaft machining should be the minimum, and the unnecessary protruding shoulder should be minimized during design, and the diameter difference between the steps should be reduced to achieve the purpose of reducing the process coefficient K.
The number of steps of the shaft should be reduced as much as possible, and the fewer the steps, the more convenient the processing. Especially when using automatic machine tool processing, the number of steps is small to make tool adjustment more convenient.
The length of the joint between the shaft and the bracket should not be too large, and the joint between the shaft of the medium and large motors and the bracket is shown in Fig. 1. If all the diameter D is used, the pressing stroke of the pressing shaft will be the full length L1, the contact area is large, the pressure required is also large, and the contact surface is easily scratched.
After the improved structure, the diameter of the middle section is reduced to D-2, and as a non-mating part, the diameter of the mating portions at both ends differs by 1 mm, and the pressing stroke is shortened to L2, thereby overcoming the above disadvantages. The radial positioning of the mating of the L2 portions at both ends facing the bracket is sufficiently reliable.
In this way, at first glance, increasing the number of steps seems to increase processing difficulties. In fact, such large shafts are not machined on automated machine tools, and the number of steps does not have a major impact on tool requirements. After the diameter of the middle section is reduced, the length of the finished car part (L2+L2) is shorter than the original value L1, and the quality of the finished car is also relatively easy to guarantee. The joint between the shaft and the bracket can also be made into two structures with a diameter difference of 1 mm, as shown in Fig. 2.
According to the national standard, the width of the shaft end keyway is determined according to the diameter of the shaft extension. In the motor design, the width of the other keyways should be as large as the width of the keyway of the shaft end. Sometimes, due to the versatility of some components (such as slip ring devices, etc.), the keyway on the mating portion allows for a different width than the keyway of the shaft extension.
The spindle motor emphasizes strength and high speed. Many times there is no position control requirement, and the speed accuracy requirement is not very high.
Sufficient output power, the spindle load property of CNC machine tools is similar to "constant power", that is, when the spindle speed of the machine tool is high, the output torque is small; when the spindle speed is low, the output torque is large; that is, motor shaft the spindle drive device is required Has the property of "constant power".
Speed range: To ensure that CNC machine tools are used in a variety of different tools and processing materials; adapt to a variety of different processing techniques, the spindle motor is required to have a certain speed range. However, the requirements for the spindle are lower than for the feed.
Speed accuracy: Generally, the static difference is less than 5%, and the higher requirement is less than 1%.
Fast: The spindle drive is sometimes used in the positioning function, which requires it to be also fast.
The feed motor has more emphasis on efficiency, and the feed axis usually has higher accuracy requirements.
The mechanical characteristics require a small speed drop and high rigidity of the servo motor.
Quick response requirements: This is more demanding in contour machining, especially for high speed machining of workpieces with large curvature.
Speed range: This allows the CNC machine to be used in a variety of different tools and materials; adapt to a variety of different processing.
A certain output torque and requires a certain overload torque. The nature of the machine tool feed mechanical load is mainly to overcome the friction of the table and the resistance of the cutting, so it is mainly the nature of "constant torque".
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