CNC laser (or plasma) high-speed die-cutting composite processing is widely used in the sheet metal industry. It combines the traditional blanking process with advanced cutting techniques, offering a more efficient and precise alternative to conventional angular die blanking. This method eliminates edge deformation and mold wear, ensuring high-quality results while improving production efficiency and reducing costs. As shown in Figure 1, this technology allows for seamless integration of punching and cutting operations.
Figure 1: Parts of the die-cutting machine
The control system of CNC laser (or plasma) high-speed die-cutting composite machines is not simply a combination of punching and cutting functions. Instead, it involves an optimized synergy between punching movements, cutting processes, and mechanical clamping systems. The cutting head design can either be fixed or mobile. A fixed cutting head uses the movement of the sheet to perform operations, resulting in a simpler mechanical structure and easier control. However, it may not be suitable for large or medium-sized plates. On the other hand, a mobile cutting head offers greater flexibility and reliability, especially for large door cutting, although it introduces additional complexity in positioning and table interaction.
This article explores the control features of the CNC die-cutting composite machining center:
1. Integrated control of punch, die, and cutting processes, including automatic switching. During a typical die-cutting operation, the clamp moves the sheet for punching first. After that, it shifts the sheet to the cutting torch. The CNC must manage positioning blocks, die selection, punch adjustment, speed control, and detection of upper and lower dead points during punching. In the cutting phase, the CNC needs to confirm the relative position of the cutting edge and the punched hole, track cutting height automatically, and adjust parameters like speed, tool compensation, power, and height based on the material's properties.
2. A key aspect of the die-cutting machine is the transition control between punching and cutting. This includes workbench exchange, repositioning of the workpiece, and error-proofing during the switch. For machines with a mobile cutting head, the sheet must be transferred from the punch table to the cutting table. The CNC controls this process according to the specific workbench design. Once the sheet is on the cutting table, the CNC calculates the starting point and positions the cutting head accordingly. For higher precision, the CNC may even detect reference holes or scan the flatness of the plate.
Figures 2 and 3 show two types of punching and laminating machines.
Figure 2: Die-cutting compound machine from foreign manufacturers (MURATEC)
Figure 3: Punching machine using the TNC2000D CNC system
The main performance indicators of typical composite machines suitable for medium and heavy plate die-cutting are listed in Table 1. Similarly, the key performance metrics of a typical CNC system for die-cutting composite machines are shown in Table 2. These tables provide detailed specifications for operators and engineers looking to understand the capabilities of modern die-cutting equipment.
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