The power press auto feeder is used with the press machine automatic production line equipment for press machine, which plays the role of accurate conveying and leveling of the press machine equipment. The power press auto feeder punch press automatic production line is widely used in the market, such as mechanical manufacturing, electrical equipment, instruments, screens, electrical control cabinets, hardware processing, auto parts and other industries of stamping production. The NC power press auto feeder is equipped with CNC press machine, which can realize the production of one line of products such as fully automatic feeding, leveling and processing. It can make the whole machine tool realize the whole material feeding machine, automatic material discharging, automatic feeding, automatic stamping and other functions, which can fully utilize raw materials to ensure manual safety production and improve production efficiency. It can also process stamping for complex graphic products. Specifically, let’s look at the power press auto feeder application installation case!

In the use of the power press auto feeder, the raw materials are fixed by the pneumatic machinery, and a zero point position is set. After that, the feeding system automatically sends the coffin to the punching position below the punch punch according to the shape of the required punching hole. After punching a hole, the punch is automatically lifted, and the feeding system sends the next punching position of the coffin to the punch below the punch. Repeating the flushing until it is completely flushed back to the zero position as required.

The overall application of the automatic feeder for power press is to place the material on the fixed frame of the automatic feeder, fix it by air pressure, and then input the corresponding data into the operation interface dialog box of the feeding system according to the size of the coffin and the required product. In the parameter column, after the operator inputs the value, the system will automatically calculate according to the filled data, eliminating the complicated human calculation and programming process and realizing automatic production. It is also possible to perform a separate jog operation according to customer requirements.

With the continuous progress of science and technology, the overall level of industrial automation has been greatly improved. Automatic feeder for power press is a kind of automatic equipment which supplies materials automatically and assists factory production. It is an indispensable part of human life and production. This paper mainly studies the transportation and loading positioning of the screw retaining ring by the automatic feeder for power press, and intellectualizes the control and improvement with the programmable logic programmer. 

At present, the commonly used feeder, whether it is air feeder, roller feeder, NC feeder, gear feeder or high-speed clip feeder, is composed of material rack, leveling machine, feeding device (feeder), punch and continuous die, feeding device (feeder). These devices form complete automatic stamping Production line [1] along the direction of material feeding in turn. This paper studies the stamping and positioning accuracy of screw retaining ring press controlled by PLC and its development prospects and applications. Programmable processors are used to reduce errors. At the same time, reliability analysis and fault handling methods are studied to improve the processing accuracy and efficiency. 

Structure and Principle of Automatic Feeder for Power Press

The base of stamping machine and the base of automatic feeder for power press are fixed on the workbench. The part of automatic feeder for power press locates in the rear. The upper part of the overlook is the vibration tray and screw feeding track of the automatic feeder. The screw retainer or workpiece enters the screw feeding track through the vibration tray, and then enters the pre-pressing position along the screw feeding track. The motor which is used to drive the vibration tray is Servo AC motor. Servo AC motor has high precision and sensitivity. The motor is located at the base. The closed-loop system controls the overall stability of the automatic feeder for power press pressed under the screw retainer. 

Firstly, the operator puts the worn lifting ring on the tooling, and the sensor detects the existence of the workpiece, and sends the detection signal to the PLC processor, which controls the action of the cylinder, and the device detects the total length of the bolt in real time. Start the equipment, and the workpiece has been pre-positioned, and the detection signal is transmitted to the PLC processor, which controls the action of the transmission device, and moves the screw retaining ring through the feeding device and the vibration disk [3]. When the positioning sensor detects that the workpiece is in a predetermined position, it transmits the signal to the control system. After receiving the signal, the control system transmits the instructions to the PLC processor to control the cylinder action. If it does not meet the requirements, the device does not start. On the contrary, the device starts and automatically sends the screw retaining ring to the top of the bolt, and the device starts to press down. 
When the downward pressure of the equipment reaches the limit position of the workpiece, the total height of the fixtures (sleeve and gasket, etc.) on the bolt is detected by the displacement sensor. If the total height does not match the preset parameters of the equipment, the equipment will stop working by alarm; otherwise, the downward pressure will be completed. When the workpiece is processed, the PLC processor controls the clamping cylinder to loosen, and moves the workpiece to the appropriate position. It removes the processed workpiece, and puts it into the unprocessed workpiece, and circulate the processing like this. The pneumatic flexible clamping system mainly includes: control device, detection device, positioning device, clamping device and workpiece removal device.

LC and Module Selection

The hardware system of the automatic screw automatic feeder for power press uses Omron’s CP1 PLC as the core controller. During the pressing process, the cylinder is used to drive the screw retaining ring. The laser distance sensor and displacement sensor are combined to control the screw retaining ring’s pressure and the position accuracy of the bolt. Servo motor, as an important automation equipment to replace personnel operation, can achieve up to four-axis motor control by adjusting the built-in parameters. In terms of cost savings, the CP series is more in line with the actual work needs. It can achieve the positioning accuracy required by conveyor belt, assembly device, sensor, etc. It can also be used for high-speed counter, frequency conversion control functions. The CP series can greatly reduce the number of devices. In addition, the cost of the CP series is considerable and widely used. Under the CP series, CP1L includes CP1L-EM/EL with Ethernet port and can output 2-axis pulse. 

Because the Socket communication function on board can carry on the signal transmission with the computer and other communication equipment equipped with the Ethernet equipment. Rich I/O units not only improve the overall performance of PLC, but also increase input and output units such as temperature sensors. 
The function of PLC has been further expanded to make it more widely used [6]. 

Selection of Human-machine interface 

Human Machine Interaction (HMI) is a human-machine interface produced by Zhongda Telecom Co., Ltd. Touch detection unit is installed in front of the display screen to detect the user’s touch position and accept the backward touch screen controller. The main function of Delta touch screen controller is to receive touch information from the touch point detection device, to convert it into contact coordinates, and then send it to the CPU, which can also receive commands from the CPU and execute them.