Ultra-high speed CNC sawing machine dynamic tracking

The steel pipe cutting in the metallurgical industry is usually done by flying saws: the running speed of general steel pipes is 60m/min. In order to meet the ever-rapid development demand, ultra-high speed flying saws have emerged. This article describes the ultra-high speed flying saw with a numerical control system to complete the dynamic tracking and how to select the servo unit and motor under the parameters that meet the production requirements. The author hopes to use the following examples to learn from peers involved in this field. First of all, we should understand the production demand parameters, such as the known steel pipe running speed is 180m/min, and the flying saw cutting time we set a round trip for 2s. see picture 1.

figure 1

figure 2

In the figure above, 0.2s is the acceleration time. After accelerating to the speed v of 3m/s, it begins to move at a constant speed. After a constant speed of 0.6s, it begins to decelerate. According to the above figure, we can get the acceleration: a=v/t=3/0.2=15m/s2 So the control system and servo motor should meet the above acceleration requirements. In addition, when the speed is 3m/s, using a ball screw is not enough, so we use the German WH80 linear motion unit to complete. The following is a selection of servo motor torque: Total torque is Ma=Mload+Mtrans+Mrol+Mlide
Where: Mload - load torque Mtrans - linear motion plus torque Mrol - rotation acceleration torque Mlide - no-load torque and Mload = (100 × 9.8 × 0.1 × 63.66) / 2000 = 3.1N · m Mtrans=(100×15×63.66)/2000=48N·m Mrol=0.23N·m Mlide=3.6N·m
Therefore Ma=56.4N·m Considering continuous operation, the final torque M=56.4/(70%)=80.6N·m. The linear motion unit is driven by a servo motor via a gear. After checking that the moving distance of the linear motion unit is 200mm/r, if you want to reach 3m/s, the speed of the servo motor should reach 900m/min, then through the 1:3 deceleration, the final torque of the motor is 26.9N·m. The speed required by the motor is 2700 r/min. From the above calculations, we can select a more economical motor torque and power that can meet the requirements. In reality, the control system we selected NUM1020T, Figure 2 for the machine tool connection diagram. In addition, as long as the relevant parameters including the synchronization function are set and the PLC and the workpiece machining program are well programmed, the above functions can be conveniently realized.

Shaping Machine

Shaping machine is a machine designed for giving desired shapes to the surfaces that may be horizontal, vertical and flat. A shaping tool is used to cut in curves, different angles, and many other shapes. A disc is responsible for the tool rotation which results in the forward and backward movement. The cutting tool is used to give the shape to the hard surface of metal or wood by removing the excess material.
The shaping machine operates in the reciprocating type of machine function. Here the work piece is fixed on the machine table and the cutting tool is placed on the work piece. Reciprocating movements over the work piece results in forward and backward strokes. Forward stroke is responsible for cutting action over the object and backward movement is responsible for restoring its position without any cutting action.

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