The wire drawing machine solution needs to consider equipment composition, parameters, control system, degree of automation, safety measures and maintenance, etc. According to the specific production needs, a suitable wire drawing machine solution can be selected, adjusted, and optimized according to the actual situation to achieve the best production efficiency and product quality.
Wire drawing machine is an important equipment for metal wire production. Its main function is to draw various wires into filaments of various specifications.
Equipment composition is an important part of the wire drawing machine solution.
Wire drawing machine equipment composition: The wire drawing machine is mainly composed of a feeding device, a traction device, a cooling device, and a winding device.
The feeding device is used to feed raw materials into the machine; the traction device is used to stretch the metal material; the cooling device is used to cool the metal material during the stretching process; the winding device is used to roll the stretched metal wire. Wind into the desired shape.
In recent years, frequency converters have been widely used in the wire drawing machine industry. They have greatly improved the automation level and processing capabilities of wire drawing machines, effectively reduced the unit energy consumption and maintenance costs of the equipment, and have been widely recognized by the industry.
Introduction to the Wire Drawing Machine
Wire drawing machine refers to mechanical equipment that presses metal materials through a drawing die at normal temperature. Through drawing, the wire can be processed into wires of various specifications required. It is widely used in industrial applications.
Mechanical equipment is widely used in machinery manufacturing, hardware processing, petrochemicals, plastics, bamboo and wood products, wires and cables, and other industries.
Introduction to Wire Drawing Machine Solution and Process
Pay-off: For the entire wire drawing machine link, the pay-off process of the wire drawing machine does not require high precision. The double-frequency-controlled wire drawing machine uses the wire tension in the drawing link to stretch through the disc, that is, the wire is paid out through tension. The rack automatically pays off the wires.
Wire drawing: With different metal materials, different product precision and requirements, the wire drawing process is very different.
The wire drawing part is controlled by a main motor. The metal wire is guided by the internal cone wheel and gradually stretched through various levels of molds. The wire meets the required specifications. At the same time, the coolant is turned on to cool the mold during wire drawing.
Rewinding: Rewinding is the most critical link of the double-frequency conversion wire drawing machine. It has a decisive influence on the performance of the wire drawing machine and is also an important basis for testing the electrical performance of the wire drawing machine.
The winding is driven by a winding motor to wind up the wire reel. The wire comes out of the drawing part and passes through the tension lever. The function of the tension lever is to feed back the current tension signal to the host. The slave machine adjusts the output frequency according to the deviation of the feedback signal. This ensures constant tension during the winding process.
Wire Drawing Machine Advantages
- The speed of the drawing part is infinitely adjustable, the starting torque is large, and the operation is smooth.
- When the winding diameter of the take-up part changes from small to large, the line speed must always be kept constant.
- It can be started directly regardless of the position of the swing bar, and no hands are needed during the starting process.
- The tension swing bar is stable during the entire operation. When a change in tension is detected, the winding system must respond quickly to regain a constant tension state.
- Ensure smooth transition during starting and stopping, and ensure a certain tension to prevent wire breakage.
- When threading, the drawing motor needs to run inching.
- When the wire is broken, a brake signal is required to overcome the inertia of the winding and prevent the originally wound wire from unwinding.
- No matter whether the current winding status is empty, half, or full, it can be stopped and started at any time.
Working Principle of Double Frequency Conversion Wire Drawing Machine
The main pull inverter actually only performs a simple speed regulation, but it needs to output a frequency change signal (i.e. analog AO output signal, AO function selected as output frequency) as the speed reference of the take-up inverter.
The take-up wire drawing machine solution calculates the synchronous output frequency based on the signal sent by the host and the feedback voltage signal of the swing bar position. When calculating, it must be considered to adapt to different speeds of the host, different reel diameters of the take-up reel, and different positions of the swing bar.
The pay-off motor and take-up motor are controlled by two frequency converters respectively. The pay-off frequency converter adjusts the rotation speed through an external analog quantity, and the take-up frequency converter controls the take-up frequency converter based on the frequency change output signal of the pay-off frequency converter and the tension swing bar feedback signal after being adjusted by the analog quantity.
As the winding diameter of the take-up drum changes, the feedback signal of the tension swing bar also changes. This signal and the analog AO output signal of the pay-off frequency converter constitute two analog input signals. After the analog auxiliary addition, the silk thread is maintained A certain linear speed.
Since the take-up motor can automatically synchronize with the main pull under the control of analog mode, the position of the swing bar is basically maintained at the middle position, which in a sense ensures that the tension of the take-up is constant.
Wire Drawing Machine Solution Parameter Description (host part parameters)
F0.02: 1 (external start)
F0.03: 2 (external potentiometer speed adjustment)
F0.17: 40 (acceleration time)
F0.18: 40 (deceleration time)
F2.00: 1 (forward rotation)
F2.01: 4 (forward jog)
F2.02: 9 (fault reset)
F3.03: 2 (fault indication)
Wire drawing machine program debugging instructions
- Pay-off: free-way wire drawing machine solution.
- Wire drawing: Select the appropriate frequency converter based on the actual motor power. After passing through the multi-stage mold, the wire is pulled to the required diameter.
- Take-up: The asynchronous motor is driven by a frequency converter with suitable power. When the motor is in a stopped state, the brake is activated and the take-up device cannot rotate anymore.
- Tension feedback: There is a tension dancer roller between the wire drawing and take-up links. The rear end of the dancer roller is connected with a single-turn potentiometer. The potentiometer is used to feedback on the position of the dancer roller to achieve the purpose of detecting tension.
- Debugging instructions for wire drawing machine scheme a. First, calculate the maximum operating frequency required for the main drawing frequency converter based on the maximum linear speed required by the wire drawing machine plan process;
b. Calculate the maximum frequency required for winding based on the actual transmission ratio;
c. Set the default transmission ratio coefficient according to the mechanical rotation ratio relationship at half disc time;
d. The acceleration and deceleration time of the main drive inverter should be as long as possible (usually 40 to 60 seconds), so that acceleration and deceleration can be carried out smoothly;
e. The balance position of the tension swing bar must be adjusted to ensure that the mechanical midpoint corresponds to the feedback midpoint.
Wire Drawing Machine Solution Provided Based on Actual Customer Site Conditions
In order to cooperate with the detection of broken wires, when starting, first lift the swing bar to the equilibrium position, wait for the wire to be tightened, and then loosen it to prevent the motor from starting when the swing bar is at the limit switch position. When debugging, first debug the open-loop vector mode of the main pull-up and winding inverter normally.
Calculate the maximum operating frequency required by the winding converter based on the maximum linear speed required by the wire drawing machine plan, and then match the maximum frequency of the main drawing according to the actual transmission ratio to ensure that the linear speed difference between the front and rear stages is not very large. Thus, the winding frequency converter is adjusted and controlled according to the analog signal of the tension swing rod feedback value.
Precautions for Debugging Wire Drawing Machine Solution
1) The linear relationship between the swing lever position voltage feedback signal and the swing lever position must be correct. If it is incorrect, it can be corrected by setting the external given quantity characteristic curve.
2) Set the acceleration and deceleration time of the drawing motor to be longer to facilitate tracking of the winding motor.
3) During normal operation, the tension swing bar swings too large. At this time, check the matching gap between the tension swing bar feedback signal and the large and small gears between the swing bar.
4) During normal operation, if there are periodic sudden fluctuations, attention should be paid to the position of the travel switch of the wiring machine. If it is not in the optimal position, unevenness on both sides of the reel will occur, causing the coiling diameter to change, further affecting the stability of the tension swing bar.
The successful transformation of the dual-frequency wire drawing machine solution has reduced system costs, accelerated system response, made operation simpler and more convenient, significantly improved work efficiency, and highly stable operating conditions reduced the disconnection rate, and improved product quality.
The practice has proved that the wire drawing machine solution introduced in this article is a highly stable, reliable wire drawing machine modification solution that can meet the actual requirements of the site.
