The fiber laser cutting machine adopts an open CNC system controlled by a computer

Fiber laser cutting machine proposes to develop a fiber laser cutting machine numerical control system based on the PMAC card on the LabVIEW platform. It introduces its hardware structure, working principle and software system design. Fiber laser cutting machine is an important equipment for garment factories to cut cloth in large quantities. It can cut a few centimeters of cloth at a time, with high efficiency. The open CNC system controlled by a computer can improve the cutting precision and increase the utilization rate of the cloth u003d this In the system, the control method of multi-axis motion control board is adopted, and the PMAc motion control board is inserted into the standard slot of the eight PC machine for real-time control, and the PC machine is used as a human-computer interaction interface and system management. Through the modular design method, a unified and reconfigurable system die platform is established, which greatly enhances the flexibility and adaptability of the CNC system. Hardware structure, introduction to 1PMAC, this control system is built by inserting PMAC motion control card and general I/O card DIO48 on the PC. Carry out He service ring update and communicate with PC via serial port and bus. In addition, PMAc can realize real-time multi-task processing through priority judgment, which improves the running speed and control accuracy of the control system. The hardware structure and working principle mainly use the ISA bus for communication between the PC and the PMAC card. The upper computer PC mainly realizes the control and management of the system, and the lower computer PMAC completes real-time control of the movement of the name axis, and real-time feedback of the movement status, such as the motor position and operating status. The system hardware structure is shown as in Fig. 1. The key component of the fiber laser cutting machine is the cutting head, which has three degrees of freedom to be controlled, namely the X-axis position, the Y-axis position and the rotation angle C around the Z-axis. For cost considerations, this system controls the X-axis and Y-axis positions through the MINAS PMAC card plugged into the PC ISA standard bus plug orange, and drives the cutting head to move in the XY plane. The X and Y axes are driven by 400W AC servos respectively. The motor is driven by a planetary gear reducer to reduce speed.

When the fiber laser cutting machine is working, the cutter head continuously adjusts the rotation angle C according to the trajectory in the XY plane, so that the forward direction of the cutter head is consistent with the tangent direction of the curve. The sensor collects the force on the blade surface, and after processing by the voltage comparison circuit, the output is digital signals f0, f1, f2. According to the combination of these three values, the deflection angle of the cutter head is compensated to balance the force on both sides of the blade. The surface keeps vertical movement up and down to ensure cutting accuracy. The universal I/O card is inserted into the slot of the PC through the PCI bus. It controls the stepper motor by outputting control signals CP, CW, EN, and realizes the rotation of the cutter head. J5 port is a general-purpose digital input and support outlet. It provides 8 general-purpose digital inputs and 8 general-purpose digital shooting. These inputs and outputs are usually taken by the software by defining M variables. In the definition of M variable, variables M1 to M8 are used to read output 1~8 respectively, and M11~M18 are used to read input respectively. The movement of the cutter head to vibrate up and down to cut the cloth is driven by a permanent magnet brushless DC motor through a synchronous gear belt. Transfer, the rotation of the eccentric wheel is transformed into the up and down movement of the cutter head. The variable M1 is used to control the start and stop of the motor. M2 outputs a digital signal to control the tool head raising and lowering the knife, M3 and M4 variable output respectively perform the functions of knife sharpening and presser foot. M11, M12, M13 are used to receive the detection digital signal iD.f1.f2 from the tool head. M14 is used to detect the rotating zero position of the cutter head. Before each program runs, the initialization of the cutting head position must be completed to make the cutting accurately return to the initial zero position, which is the reference point of the rotating movement. Software development PMAC card development software includes PCOMM32 and PCOMM16. The former is a dynamic link library function under Windows, which can be developed using VB, VC, LabVIEW and other software. The function of PCOMM16 is the same as PCOMM32, except that the former is a 16-bit DOS development environment.

This article was published by the original 2019