What is the content of injection mold CAPP?How is it classified?
So-called injection mold CAPP, computer aided process planning design, also called "means the technology by computer aided process design, system and scientific method to determine the whole technology process of parts from the blank to the finished product.
(1) main content of CAPP
Injection mold CAPP is the use of computer information processing and management advantages, the use of advanced information processing technology and intelligent technology to help the designers to complete the process design of various tasks, such as locating datum, formulate parts processing craft route, determine the machining allowance of each process and to calculate process dimension and tolerance, choose processing equipment and process equipment, cutting dosage, determine to determine the important working procedure quality test items and test methods, calculate man-hour quota, write all kinds of process documents,Finally get a variety of products for production process document Processes such as production process flow diagram, process CARDS, process CARDS or process CARDS, process management document, etc.) and nc machining programming, production plan and operating plan for relevant data and information, as the nc machining program management, production preparation and operation control system of basic information.
(2) classification of CAPP system
According to its working principle, CAPP system can be divided into three types: retrieval, derivation and creation.
The retrieval CAPP system is actually a technical file management system for the process.It is a preprogrammed part of the process process into the computer, when the new part of the process line, can first retrieve the stored part of the process procedures.If no modification is required, it is called directly.If it is not suitable, it will be modified according to the new parts and then saved to the computer for later retrieval.
Retrieval CAPP system is actually a management system of process document database, but it has poor function, weak automatic decision-making ability, and the process decision-making is completely completed by the process personnel.In addition, retrieval CAPP system is easy to develop, easy to operate, practical and has a large market.
String derived CAPP system this system is developed and derived from retrieval based CAPP.It divides parts into similar parts groups according to the principle of group technology, makes up standard process rules according to component groups, and stores them in the computer in the form of documents.Design new parts of process planning, enter the code of parts group technology, the computer discriminant of the parts belong to categories, and then search out the components of the standard procedure, then according to the shape of the structure of the zero ^, dimensional tolerance, edit, modify, in order to obtain suitable for process planning of the parts.
The principle of derivative CAPP system is simple and easy to develop. At present, most operating systems in enterprises are derivative systems.The limitations of this system are poor flexibility and portability.But due to the same enterprises in the processing of parts do you usually also have similarity, structural similarity and process so derived CAPP system is generally can meet the needs of most businesses, with a strong practicability.
(3) the type of this kind of system and retrieval type of CAPP system and a derived type method is different, it is not a direct search for similar parts process file and modify, but according to the parts of the information through the logical inference rules, the formula and algorithm, etc., to make technology decisions and automatically "chuang cheng" a part of process planning.
Chuang cheng approach for CAPP, close to the innovation of the human way of thinking, but because of the complexity of the process decision making, we can leave the person's subjective experience, most of the process is not to establish a practical mathematical model and a general algorithm, it is difficult to form the program code, so gen into type CAPP can only handle shape simple parts, practicality is smaller.