Views: 13 Author: DURMAPRESS Publish Time: 2021-11-15 Origin: DURMAPRESS
1) Single punching: punching in a single time, including linear distribution, circular distribution, circular distribution, grid hole stamping.
2) the same direction of continuous blanking: the use of rectangular mold overlapped processing way, can process long holes, cutting edges, etc..
3) multi-direction continuous blanking: the use of small die processing large hole processing.
4) Nibbling: the use of small round die in a small step for continuous punching arc processing.
5) Single forming: according to the mold shape of a shallow deep drawing molding processing mode.
6) continuous forming: forming larger than the mold size of the molding process, such as large shutter, rolling ribs, rolling steps and other processing methods.
7) Array forming: processing multiple pieces of the same or different workpiece processing methods on the large plate.
Numerical control turret punch stepping motor introduction
The stepping motor in nc turret punch press is a special motor which converts electric pulse signal into mechanical angular displacement. The rotor of the stepper motor has no winding and a number of evenly distributed teeth, and the stator has an exciting winding. When there is a pulse input, the rotor will turn a fixed Angle, its angular displacement and input pulse number is strictly proportional to the time and input pulse synchronization. Under the excitation of the winding power supply, the air gap magnetic field can keep the original position unchanged and keep the rotor in the positioning state.
The output torque of stepper motor machine can be divided into fast stepper motor and power stepper motor: according to the number of excitation phases can be divided into three phase, four phase, five phase, six phase and even eight phase stepper motor; According to its working principle, it is divided into magnetic roar type and reaction type stepping motor.
Because the angular displacement of the stepper motor is proportional to the number of instruction pulses, and the direction of rotation is related to the power phase sequence, so as long as the number and frequency of input pulses and the power phase sequence of the motor windings are controlled, the required Angle, speed and direction can be obtained. Its wide speed range, response, sensitivity, simple control system, and has a certain precision, so it is widely used in open loop servo system.
1. Working principle of stepper motor
Although there are many types of stepper motors, the basic principle is the same. Taking the three-phase reaction stepping motor as an example, its working principle is explained.
There are 3 pairs of magnetic poles on the stator of the stepper motor, and the excitation windings are wound above, which are called phase A, phase 8 and phase C respectively. The rotor has equidistant small teeth (there are 4 teeth in the picture). If A is first added to the electric pulse, then the rotor 1, 3 two teeth are attracted by magnetic pole A and aligned with the magnetic pole, and then B is added to the electric pulse, then the phase magnetic pole will be closest to it 2, 4 teeth attract past, so that the rotor along the counterclockwise direction of 30°. In the same way, if the C is added to the electric pulse, the rotor is rotated 30°. After that, the A is added to the electric pulse, and the rotor continues to rotate by 30°. A→B→C→A... Turn on the electricity, the stepper motor will turn counterclockwise.
2. Stepper motor drive
According to the working principle of stepper motor, we know that the angular displacement of stepper motor is proportional to the number of instruction pulse, and the direction of rotation is related to the direction of electricity. Therefore, the driving circuit of stepping motor must be able to control the frequency, number and power sequence of electric signals in the excitation winding of stepping motor. This work is done by the pulse distributor and the power amplifier through the pulse instruction, in a certain order to turn on or off the power amplifier, so that the motor corresponding excitation windings power on or off the device is called the pulse distributor, also known as the ring distributor. It consists of gate circuit, trigger and other basic logic function components. The forward and reverse of stepper motor is controlled by direction instruction. The rotation Angle and speed of stepper motor are determined by the frequency and number of instruction pulse respectively.
Pulse allocation can be implemented by hardware or software. As hardware, there are dedicated dispenser functional components sold on the market. The use of asIC is beneficial to improve system accessibility and reduce system cost. The stepper motor is controlled by microcomputer, and pulse distribution is programmed by assembly language, which is called software pulse distribution. This method is characterized by flexible control, high reliability and low manufacturing cost. Of course, it needs to compile complex programs, need to occupy a large number of memory units and operation time.