The manufacturing process of non-standard equipment requires a large number of non-standard sheet metal parts. With the continuous progress of China's economy and technology, and CNC machine tools have the characteristics of strong adaptability to workpiece modification, high processing accuracy and high productivity; therefore CNC technology has been widely used in sheet metal machine tools. It solves the problems of high precision, complex shapes, irregular shapes and large batches of parts in sheet metal processing. At the same time, the simple operation of the CNC system greatly reduces the labor of workers. strength.

The manufacturing process of non-standard equipment requires a large number of non-standard sheet metal parts to be processed. The shape of the sheet metal parts is not fixed, the traditional processing method is difficult, and the energy consumption is high. The introduction of CNC technology has been widely used in sheet metal machine tools. It solves the problems of high precision, complex shapes, large batches and other problems in sheet metal processing. It also has strong adaptability to workpiece modification and high processing accuracy. Improve productivity and other characteristics, and sheet metal processing technology is developing in a diversified direction.

At present, sheet metal can be defined as: a comprehensive cold working process for metal sheets (usually below 6mm), including shearing, punching / cutting / compositing, bending, welding, riveting, splicing, forming (such as car body), etc. Its remarkable feature is the same thickness of the same part. Generally speaking, the basic equipment of sheet metal includes shearing machine, CNC punching machine / laser, plasma, water jet cutting machine, flame cutting machine, bending machine, and various auxiliary equipment such as: decoiling machine, leveling machine, deburring machine, Spot welding machine, bite machine, etc. Sheet metal is also sometimes used as a pull metal. The word comes from the English platemetal. Generally, some metal thin plates are plastically deformed by hand or die stamping to form the desired shape and size, and can be further welded or a small amount of mechanical processing. The formation of more complex parts, such as chimneys, tin stoves, and car shells commonly used in homes are all sheet metal parts.

Generally, the three most important steps of sheet metal are shearing, punching / cutting, and bending.

Through the use of CNC equipment in recent years, it can enhance the processing capacity on non-standard sheet metal parts. At present, it is like the main CNC water jet cutting machine, CNC shearing machine, CNC bending machine, CNC turret punch press, spot welding machine. , Plasma cutting machine and other equipment can form a complete set of sheet metal processing production line. At present, domestic shearing and bending CNC systems such as the Dutch DELEM system are widely used. The application of this control system is relatively mature and stable.

Shearing is the first process in the sheet metal processing process, and the accuracy of the blanking directly affects the processing quality of the subsequent process. CNC shearing machine is composed of CNC device, servo system, measuring device and machine tool. The servo system is composed of three servo motors and servo drive devices. There are two servo motors in front of the machine tool, usually one main motor works alone, and the auxiliary motor works if the bevel is processed. The CNC system gives two different instructions to form the bevel. There is a servo motor for rear positioning. The application of CNC shearing machine makes the repeated cutting of large batches save the process of marking and alignment, improve labor efficiency, and ensure the size of the blank and the tolerance of the diagonal of the blank.

CNC water jet cutting machine completes the processing of complex shapes and open-hole sheet metal parts. The machine tool operator determines the processing plan and writes the program according to the part drawing and process requirements. The operator directly writes the program into the program memory through the operation panel of the machine tool; with the increasing maturity of microelectronics and computer technology, the development of CNC technology in China has been promoted. With the development of CAD / CAM technology, operators can input graphics into the computer to generate programs through computer-related software, copy them into the disk, and enter the numerical control system through the disk drive. You can also use the computer and CNC system serial input method. The application of CNC water jet cutting machine makes the processing of the original complex shape and structure simple. The processing of porous parts is positioned and cut once, and the cutting accuracy is as high as ± 0.1mm.

Bending is a forming process in sheet metal processing. When the material is bent, the outer layer is stretched and the inner layer is compressed. When the tensile stress of the outer layer exceeds the strength limit of the material, cracks and breaks will occur. Choose a reasonable mold width , Bending radius, pressure value, holding time and other parameters are very important; traditional hydraulic bending machine can only rely on manual to estimate various parameters. The CNC bending machine automatically adjusts the sheet width according to the input parameters, and calculates the relevant parameters such as pressure and contact time required for bending through the CNC system. All parameters are displayed on the screen. The CNC bending machine is composed of CNC device, servo system, hydraulic device and machine tool. The servo system is composed of a servo motor and a servo drive device. A servo motor is positioned behind the machine tool. The automatic positioning eliminates the process of manual scribing and line alignment. The bending angle of the conventional mold is arbitrary between 78 ° -180 ° Adjustable, the minimum bending angle can be up to 30 ° with a special mold, and the machining accuracy is guaranteed within ± 0.5 °. At the same time, through the selection of new molds, it becomes a reality to process complex curved surfaces, such as processing some non-standard angle steel, channel steel, C-shaped steel, cable bridges, custom power distribution cabinets, etc., and products of different specifications can be produced according to production needs. In addition, the advantages of CNC bending are more obvious when processing large quantities of parts. All bending procedures of a workpiece can be completed at one time. The positioning is automatically adjusted after the system is set. The positioning block automatically converts the part size according to the program, which can greatly reduce the The amount of labor generated.

Numerical control technology has been widely used in sheet metal machine tools. It solves the problems of high precision, complex shape and large batch of parts in sheet metal processing. Their application in production has greatly improved sheet metal processing capabilities and ensured the quality and output of sheet metal parts. At the same time, the use of CNC machine tools greatly simplifies the production process, reduces processing time and improves production efficiency, greatly improves the utilization rate of materials, reduces production costs and reduces the labor intensity of workers, which will be the trend of future equipment application development.