Abstract: Based on the introduction of stamping applications, this paper discusses the automation of stamping processes and the working principle of crankshaft-type automated stamping machines. Finally, it focuses on the design technology of Delta CNC stamping machines, including the design of important Delta servo parameters. Keywords: Stamping, CNC stamping machine, servo PLC 1 Introduction 60-70% of metal materials are sheet metal, and most sheet metal is processed into finished products through stamping. Stamping is widely used in various sectors of the national economy. For example, stamping is used in aerospace, aviation, military, machinery, agricultural machinery, electronics, information, railway, post and telecommunications, transportation, chemical, medical equipment, household appliances, and light industry. Automobile bodies, chassis, fuel tanks, radiator fins, boiler drums, container shells, motor cores, and silicon steel sheets for electrical appliances are all stamped. A large number of stamped parts are used in instruments, household appliances, bicycles, office machinery, household utensils, and hardware products. According to the process classification, stamping can be divided into two main categories: separation processes and forming processes. The stamping separation process, also known as blanking, aims to separate stamped parts from sheet metal along a specific contour line while ensuring the quality requirements of the separated section. This process is achieved using a punch press. Blanking is a pressure processing method that uses a die mounted on a press to apply pressure to the material at room temperature, causing separation deformation to obtain the desired part. Except for hydraulic presses for forming thick plates, stamping equipment generally uses mechanical presses. Stamped parts are characterized by being thin, uniform, lightweight, and strong. Due to the use of precision dies, workpiece accuracy can reach the micron level, with high repeatability and consistent specifications. Holes, bosses, etc., can be stamped out. Cold-stamped parts generally do not undergo further machining, or only require minimal machining. 2. Issues with Punch Press Automation While stamping is a highly efficient production method, manual single-die punch presses have a large production capacity. When producing tens or hundreds of stamped parts per minute, the processes of feeding, stamping, ejection, and waste removal need to be completed within a short time. Manual single-die punch press production cannot meet the requirements of high-speed production and also leads to numerous personal injury, equipment, and quality accidents. Safe and efficient production in stamping is a significant practical challenge. CNC punch presses using compound dies, especially multi-station progressive dies, can complete multiple stamping processes on a single press, achieving fully automated production from uncoiling, leveling, blanking to forming and finishing. This results in high production efficiency, good working conditions, and low production costs, typically producing hundreds of pieces per minute. Centered on a modern high-speed multi-station mechanical press, and equipped with uncoiling, leveling, finished product collection, and conveying machinery, as well as a die library and quick die-changing device, and controlled by computer programs, a high-productivity automated stamping production line can be formed. The application of CNC technology in the field of punch press equipment has upgraded ordinary punch presses, enabling them to perform stamping functions through automatic control. High-speed fully automatic CNC punch presses based on PLC technology automatically complete the integrated processing of loading, feeding, unloading, and removing wire mesh waste from sheet metal. A fully automatic CNC punch press typically consists of five main parts: the machine body, loading device, feeding device, wire mesh waste removal device, automated electrical control hardware, and control software. 3. Crankshaft CNC Punch Press The crankshaft punch press is the most common punch press structure. The working principle of a crankshaft punch press is to control the engagement of the clutch to control the single or continuous reciprocating motion of the slide, i.e., the upper die, to achieve the punching process of the sheet metal. The brake is controlled to stop the working mechanism of the press. The feeding action is generally completed manually or by intermittent mechanical mechanisms. The punching principle of the crankshaft press in a CNC punch press remains the same. The difference is that a PLC is used to control the reciprocating motion of the slide, i.e., the start and stop of the reciprocating motion of the upper die, and the regular X and Y-axis feeding motion of the sheet metal being processed, and to coordinate these two actions, i.e., to achieve synchronous control of the punching and feeding actions. In fully automatic punching processing, the two-axis worktable is one of the key mechanical components. The inertia of the worktable limits the feeding speed and acceleration of the worktable. To improve the feeding speed of the worktable, the inertia of the worktable may be reduced during the design phase. In the stamping process, X-axis feeding is more frequent than Y-axis feeding; that is, the Y-axis feeds only once for every number of workpieces stamped in a row of sheet metal. Therefore, the worktable is designed with the X-axis at the top and the Y-axis at the bottom. When the worktable feeds along the X-axis, the X-axis motor only drives the lighter clamping slide along the upper guide rail via the lead screw. When feeding along the Y-axis, the Y-axis motor drives the heavier mechanism, consisting of the upper guide rail, upper motor, upper lead screw, and clamping slide, along the lower guide rail. This provides a fast and safe feeding process. For ease of maintenance and use, two internationally accepted standards have gradually emerged for CNC system software structure: ISO international standard and EIA (Electronic Industries Association) standard. Based on the characteristics of stamping, the commonly used ISO standard is referenced. Because the worktable feeding in stamping involves a large number of repetitive actions, to reduce the amount of programming required, internal loop, external loop, and jump instructions are set in the user commands, greatly reducing the amount of programming required. The system software adopts a modular structure with five modular structures. After the system is powered on or reset, it is in a monitoring state. At this time, the five functional modules are available for selection. 4 Delta CNC Punch Press Solution Based on the Delta electromechanical automation platform, the configuration includes: Delta touch screen HMI; Delta EH series PLC; Delta ASDA-AB series AC servo system; Delta B series frequency converter. The punch of the punch press has a mechanical cam structure. After the motor starts, it moves up and down periodically at fixed intervals. During this process, the servo motion has two process automation states: small step distance - in this process, the servo motion must reach the corresponding punching position for each punching; large step distance - due to the large step distance, the feed axis cannot reach the punching position during normal punching, and punching can only begin after the feed is in place. The control method adopts Delta servo register control positioning mode Pr mode. After setting the corresponding distance through the touch screen, the calculation is performed and converted into the corresponding number of revolutions and the remaining number of pulses. At the same time, it is written into the corresponding servo register through communication and started through the servo external start command. Specific control process: 4.1 Human-machine interface design (1) Touch screen screen design: In the touch screen screen, the standard CNC concept is adopted this time, with three control modes, namely manual mode, automatic mode and reference point mode. The manual mode is shown in Figure 1. In the manual mode, the feed axis can be rotated at will, which is beneficial for moving the slide or finding the clamping point. The automatic mode is shown in Figure 2. In the automatic mode, machining can be started. The reference point mode is shown in Figure 3. After the machine is turned on, the mechanical coordinate system is established by executing the return to the reference point to determine the zero point of the machine tool. [align=center] Figure 1 Manual mode screen Figure 2 Automatic mode screen Figure 3 Reference point screen[/align] (2) Coordinate display: The machine tool coordinates can be displayed by reading the servo status register in the touch screen. Its macro program is ignored. The process screen is shown in Figure 4: The starting point coordinates, step distance, number of punch holes, maximum step distance processing speed, etc. can be set in the process screen. When the set step distance is greater than the maximum step distance, the PLC will judge and wait for the feed to arrive before the punch can be punched down. [align=center] Figure 4 Process screen[/align] (3) Clock macro: In the process screen, through the corresponding value setting, it is automatically converted into the corresponding servo revolution and pulse number and written to the servo driver. 4.2 PLC program design Action execution and logic judgment The ladder diagram program of the PLC program is as follows: 4.3 AC servo system parameter setting (1) Motor feedback parameters: 0-04 = 0 (feedback pulse number); 0-05 = 1 (feedback revolution number). (2) Positioning mode Pr parameter: 1-01 = 1 (Pr control mode). (3) Electronic gear ratio numerator: 1-44 = 5; electronic gear ratio denominator 1-45 = 2. (4) The speed of the first reference point is 1-48 = 20; the speed of the second reference point is 1-49 = 30. (5) Servo enable signal: 2-10 = 1 (Servo direct enable) (6) Other servo parameters: 2-11 = 108 (PR mode start signal) 2-12 = 122 (Reverse limit) 2-13 = 137/111 (JOG+ and PR mode register selection - communication control) 2-14 = 138/112 (JOG- and PR mode register selection - communication control) 2-15 = 106 (Reverse direction signal) 2-16 = 127 (Reference point trigger signal) 2-17 = 124 (Reference point completion signal) 2-18 = 105 (Servo position reached) 2-19 = 109 (Original point return completed) 2-20 = 107 (Servo alarm) Note: 2-10～2-22 can be referred to the input/output terminal definition table 3-00 in Chapter 7. 2/3 (Station Number Setting) 3-01 = 1 (Communication Transmission Rate) 3-02 = 0 (Communication Protocol) 3-05 = 2 (Communication Method - 485 Communication) 5 Conclusion Through case study design and discussion, the CNC punching machine solution based on Delta's electromechanical automation platform demonstrates the significant technical advantages of single-brand mechatronics system integration in application. Applying Delta's single-brand electromechanical technology platform improves the basic equipment capabilities of CNC machine tools, achieving the comprehensive goal of optimal performance, service, and cost.