Application of DA200 Series 55KW Servo on Plateshears Machine

Release time:2020-09-17
Click amount: 1902

Introduction: Shearing machine is a machine that uses a blade to reciprocate linearly to shear a sheet relative to another blade. By means of the moving upper blade and the fixed lower blade, a reasonable blade gap is applied to apply shearing force to the metal sheets of various thicknesses, so that the plates are broken and separated according to the required size. Shearing machine is one of the forging machinery, the main role is the metal processing industry. Shearing machine is a kind of shearing equipment widely used in machining, which can cut steel plate materials of various thicknesses. Commonly used shearing machines are divided into three types: flat shear, rolling shear and vibration shear (as shown in Figure 1).

Keywords: shearing machine, DA200 servo

1.the introduction and characteristics of the site conditions

Products are widely used in aviation, light industry, metallurgy, chemical, construction, shipbuilding, automotive, electric power, electrical, decoration and other industries to provide the required special machinery and complete sets of equipment. This paper introduces in detail the application of INVT's servo DA200 series 55KW servo and the matching INVT 290NM motor on the rolling shear machine (as shown in Figure 2 below);

Figure 2 55KW servo motor

Equipment / Process Introduction

The finished product of the whole length of the steel plate is cut into the finished products of various lengths, which are mainly completed by the following steps:
1. The servo motor drive reduction gear box is driven by a large torque, and then the roller of each stage is driven to straighten the curved steel plate horizontally.
2. The upper computer system gives the command according to the length required by the operator's setting, and the command sent by the servo receiving system drives the speed reducer.
3. The asynchronous motor drives the cutter to make the final cut.

Application Plan Configuration Table

NameModelPower ratingQTY
Servo driveDA20055kW1
Servo motor16 bit resolver encoder motor55kW1
PLCMitsubishi PLC

2.System debugging process
1)Set the correct motor code according to the servo motor nameplate, and manually input the parameters of the motor group into the servo system P8 group parameters to save;
2)Limit the jog speed and acceleration/deceleration time. After the JOG mode test is normal, change the limit parameter to the factory value for debugging. Pay special attention to the fact that because the load is a kind of large inertia gearbox device, the engine cannot be stopped too fast, and the acceleration/deceleration time of the motor must be extended;
3)Calculate the electronic gear ratio according to the mechanical parameters. Since the load is a reduction gearbox, the mechanical inertia parameter cannot be self-learned and manually adjusted to the inertia ratio;
4)Debug the gain parameters according to the requirements, and the upper computer performs the low-speed running test to repeat the positioning accuracy.

Other group setting:

2.2 Verify that the equipment selection meets the requirements.

Monitoring parameter group

The monitoring waveform generated by the coil steel material just entering the roller when the motor is running.

In particular, the servo output current peak current is about 166A, and the servo maximum current is 120A * 180% = 216A is greater than the instantaneous peak current of the feed.

The output current fluctuates between 58A and 111A, the output power is also around 50%, and the maximum motor speed is 1400 rp / min. The waveform of the output current waveform and output power detected from the above figure is slightly larger, but it is also within the range of its maximum load current (rated current * 150%).

Within one hour of running the motor with the load, the motor itself is within the ambient temperature of its operation.

2.3 This is the state in which the motor is enabled to stop running after feeding. The output current is about 50A, and the current waveform is relatively stable.

3.On-site operation status and summary:

The function of the equipment is stable. It is measured to be 10 mm thick. The length of the cut steel is 750 mm. The length of the steel plate is good. The error is less than 2 mm, which meets the requirements of customers and the stability of servo work is good.

After the above test and debugging, the servo selection is in line with the on-site working environment, and the customer's efficiency and machining accuracy have been improved a lot, especially the problem of inconsistent length of the steel plate, and also provides reference and reference for Invitro high-power servo on other equipment.

4.The material and material effect diagram after cutting is shown in the figure below.

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