SIEMENS WinAC application in die casting machine

Alloy casting method can be divided into: gravity casting, low pressure casting, semi-solid die casting, half melting injection molding and die casting. Among the more common are die casting technology, the pressure casting ( Die casting) Is to melt the metal, under high pressure, filling at high speed to type ( Die) Inside the cavity, and makes the metal in the casting solidification under pressure and forming a kind of method. High pressure, high speed is the most important feature of die casting method. Pressure casting is the fastest production casting method of all a way of filling velocity in 0. 5 ~ 70 m/s. Cold chamber or hot chamber die casting alloys available. When choosing die-casting machine for casting wall thickness determine the use of technology. Small and medium alloy casting thin-walled hot chamber method, in particular, large, thick wall of the bearing parts adopt method of cold chamber. We in magnesium alloy die-casting machine, for example for analysis. Cold chamber die casting machine's technical requirements, as a result of the magnesium alloy pressure requirements ( 300 - 400bar） Low, need smaller shoot material force to achieve the better effect, so best die casting machine can match different shot material force. More easily, because of the magnesium alloy solidification, thus requires large flow short filling time, the actual rate of 6 - per second More than 7 meters, airspeed demand higher. , more difficult to control because of magnesium alloy die casting process, the stability of the machine and the parameter controlled the demand is higher, it is better for monitoring chart and production data display, production statistics and injection parameters automatic calculation, etc. Control system characteristics and the effective solutions of WinAC magnesium alloy cold chamber die casting machine automatic control system of main characteristic is to implement the control process of the production of high-speed data acquisition, high efficient, rich and detailed production information and convenient production data access interface, etc. WinAC controller as the core of the magnesium alloy cold chamber die casting machine automatic control system, its working content mainly: the implementation of die-casting machine running all the control logic, exchange data with man-machine interface, call WinAC ODK establishment of high-speed data acquisition card driver, completion of data acquisition and control output. Requirement: the performance of high speed production process, the required control system can collect accurate 8 seconds all the data in the process of high-speed production, finish the real-time control of the equipment, and the precision of each data acquisition and real-time control is equal to zero. 3ms。 So the system of high speed problem involving the high speed data sampling, data storage, high-speed computing several aspects, such as high speed control algorithm. In view of the high speed data acquisition, in the third party ( Research degrees) ISA data acquisition card based on PC standard, through WinAC ODK drive control data acquisition card, compiled by vc + + can be stable, the completion of high-speed data acquisition and storage, and exchange data with WinAC. In the light of the problem of a large amount of data, we through WinAC ODK compiled by vc + + program to store data in a certain format in the PC hard disk, and then read the data in the same format for data processing and database operation. Solve the problem of high speed control and calculate, you need to use WinAC RTX precision high-speed performance. WinAC RTX real-time extension based on operating system kernel, Venturecom / Ardence) , based on asynchronous programming, can obtain more accurate control time, not restricted by various factors WinAC controller itself, such as system resources occupation, minimum scan time. A large amount of data processing requirements: to 0. 3 ms sampling precision of the calculation, a complete material injection process, the system must be stored at least 24000 records, a record of the pressure value, location value, valve opening need eight bytes of storage space, so the amount of data that a shot is 192 k. Recorded more than 3000 times each week injection process, so you need to complete for 192 k x 3000 = 576 MB of data statistical analysis. To accomplish such a large number of historical records stored query and statistical analysis of the data, the control system must have powerful computing and storage capacity, so you need to use the PC hardware resources such as CPU, memory, hard disk. Complex process requirements: a die casting process, the fast injection speed is about 10 m/s, the injection stroke is less than 1 m, so need to finish the pressure in the process of less than 100 ms detection, location, measurement and proportional valve control and so on a number of tasks. And asked for die casting filling process real-time control of speed and pressure curve, namely, judge the position and the pressure of the die casting machine, external control of the data information, such as the operation were performed slow pressure, a quick die casting, die casting, three quick die casting, pressure injection, injection to hammer die casting production process, and according to the high-speed sampling of oil inlet pressure, the oil outlet pressure and the injection location to control algorithm of operations, the results high speed proportional valve to adjust output to the oil inlet, adjust the pressure of the injection cylinder, change the injection speed, complete the ideal injection curve output, to realize closed loop control. WinAC ODK application development kit ( WinAC开放开发工具包) Can write code in C language development environment, generate dynamic link library, complete the complicated control calculation. Good system scalability: need to connect the third party equipment, PC as standard equipment of the fastest growing in recent years, has the very good compatibility, users to add other third party related equipment, can always be in a standard way of interface connected to the PC, and easily realize the third party equipment and data exchange between WinAC controller.