With the continuous development of science and technology, the application of computer in mechanical aided design, modern CAD/CAM, FMS, CIMS are widely used in numerical control technology. Since the successful development of CNC machine tools in the United States in 1952, it has experienced five stages of development. With the increasingly mature of microelectronics and computer technology, promote the development of numerical control technology in China, domestic numerical control system has been successfully developed, so that China's numerical control machine tools in quality, performance has been guaranteed. Because the CNC machine tool has the characteristics of strong adaptability to the workpiece modification, high processing accuracy, improve productivity and so on, it has been popularized and applied in various fields.

Numerical control technology has been widely used in sheet metal machine tools. It solves the problems of high precision, complex shape and large batch in sheet metal processing. CNC sheet metal machine tools include CNC shears, CNC laser cutting machine, CNC punch, CNC bending machine, welding machine, flame cutting machine, etc. Their application in the production greatly improves the sheet metal processing capacity, so that sheet metal parts in quality, output is guaranteed, but also greatly reduces the labor intensity of workers.

Cutting plate blanking in sheet metal processing process is the first process, blanking accuracy directly affects the processing quality of the following process, the application of CNC plate shearing machine to ensure the size of the blanking and blanking diagonal work. CNC plate shearing machine is composed of CNC device, servo system, measuring device and machine tool. Servo system is composed of three servo motors and servo drive device. There are two servo motors in front of the machine tool positioning, usually a main motor working alone, the processing range of 2-500mm, such as processing hypotenuse is deputy motor work, numerical control system gives two different instructions to form the hypotenuse. There is a servo motor in the rear positioning, which mainly processes the products with large plate surface, and the processing range is 150 ~ 4000mm. Such as Shanghai QC12K series CNC shears equipped with Swiss CYBELEC DNC60 series can store 36 sequences, internal storage memory 100 sequences.

S stamping is an important link in sheet metal processing, CNC punch can replace the processing capacity of the past three punch. Productivity has been greatly improved. CNC punch is a widely used machine tool, there are two kinds of single punch and turret. This paper takes MODEL CNC1000 as an example. The machine tool is made in Italy. Belong to the C-type structure of the machine tool, processing scope: 1270×1000mm, there are 19 mold stations in the turret, which are divided into upper and lower parts to install the punch and the concave die respectively. The external diameter of the concave die is 25.4mm, 47.62mm, 88.9mm, 125.43mm, 158.4mm and 210.00mm. The CNC punch generally has X, Y and Z axes. X axis is 0 degree direction of the machine tool, Y axis is 90 degree direction of the machine tool, Z axis installed on the turret is the device to control the Angle of the mold.

Machine operator according to the parts drawing and process requirements to determine the processing plan to write a program. The operator directly writes the program into the program memory in EDIT mode through the operation panel of the machine tool. With the development of CAD/CAM and CIMS, operators can input graphics into the computer through computer related software to generate programs, copy into the disk through the disk drive input numerical control system. Also can use the computer and numerical control system serial input method. CNC punch programming instructions are divided into G code M code, G code is used to instruct the machine tool processing motion and interpolation mode of function. Such as G91 incremental command, G90 absolute command, G29 arc punching, G68 step punching garden arc. M code is the instruction machine to do some auxiliary actions of the code. Such as M30 program stop. After the inspection procedure is correct, release the caliper and put it into the workpiece to close the caliper. Start the oil pump and punch to complete the process.

CNC punch has the following characteristics:
(1) Fully automatic centralized lubrication;
(2) Automatic cooling and lubrication of punch die
(3) hydraulic overload protector screen display and automatic reset;
(4) Equipped with pneumatic/hydraulic operation variable pressure plate clamp;
(5) large table that can fully support large sheet materials;
(6) High accuracy, high speed and low noise hydraulic CNC punch;
(7) The sliding table that can be easily replaced and safely interlocked;
(8) Polyurethane free ball device to prevent material surface scratch.