Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T 7701-95
Guidelines for Computer Aided Process Planning (CAPP) 1995-0G-20 Issued
Ministry of Machinery Industry of the People's Republic of China
Implementation on 1996-01-01
Mechanical Industry Standard of the People's Republic of China
Guidelines for Computer Aided Process Planning (CAPP) [Topic and Scope of Application]
JB/T770195
This standard defines the terminology, types, functional requirements, basic requirements for formulating process principles, requirements for information summary, design steps and performance requirements of system software, etc. This standard applies to computer-aided process planning for metal processing and can be used as a reference for computer-aided process planning of other specialties.
2Reference standards
CB4863
Machine vibration manufacturing process innovation technology source
JB/T5348.4
Machine tool industry computer-aided enterprise management information agent system Machine tool parts coding system 1LB system JR/T5992
JB/2187.3
1B/2 137. 4
13/2 251
↓/7.338.6
3 Terminology
Classification and code of mechanical manufacturing process
-Technology management guidelines T process design
3 Technology management guidelines, management process file format Mechanical parts classification code system M-1 system process management guidelines Process planning
This part shall comply with the following definitions in addition to the provisions of B4862: 3.1 Computer-aided process design (CAPP) The process of automatically encoding and programming the process card after the original data, processing parts and processing requirements of the parts are input through the computer. 3.2 Technology information
Information about the methods, parameters and rules in the process. 3.3 Process principles
Write! Based on the basic original publication of art and the experience of long-term production vision, various technical specifications of the relationship between small parts and hand-made parts are summarized:
3. 4 Bean combination parts (main parts)
Integrate all structural features and technical features of the same part (family>). It can be a high-end part in the group (read) of parts. In more cases, it is a hypothetical simulation: 3.5 Database management system
Product assembly parts system, the main functions include: (1) data definition function (2) data management function: (3) data storage and outbound maintenance function.
3.6 Comprehensive database
Data system for storing product process information. It includes sample process information library, machine tool standard, tool library and cutting data library. Approved by the Ministry of Machinery Industry on June 20, 1995
Implementation in 19960L-01
3.7 Expert system
JD/T 7701- 95
An intelligent computer application system that can play the role of a human expert in a certain field and has extensive knowledge and experience. It can use the knowledge and experience of human experts to make inferences and judgments. It consists of a knowledge base, a processor, knowledge acquisition and a human-computer interface. 3.8 Knowledge storage and management system: it stores a large number of details represented by a certain model! 3.9 Reasoning engine
A computer program with the ability to make inferences, used to control and coordinate the entire system. 4 Types of CAPP and selection principles
4.1 Types of CAPP
4.1.1 Routine
Store the software in a coded form in the computer. When developing a new process, the existing process procedures are needed. If there are ready-made procedures, they will be called out. See Appendix A for the system diagram. A14.1. 2 The derived type
assembly principle divides the parts into material groups, designs the process of the main parts in each part group, and stores them in the calculation. When designing the specific part process, the process of the sample parts in the corresponding part group is retrieved according to its code (see .TB/2251 or JB5248.4), and the design is modified in a human-machine interactive way according to the structure and process characteristics of the specific parts. The principle diagram is shown in Figure A24.1.3 in Appendix A. The generative method does not rely on the process of the parts. Instead, the process decision principle is stored in the computer in advance. When the new part information is input, the computer system performs a series of analysis and decision-making to automatically generate the process specification of the parts. See Figure A3 in Appendix A. 4.1.4 Semi-generative method The system mainly uses the process of adding parts, and in the process content, machine tools, and tool selection, it also uses the logic of the generative method and the expert system to combine the advantages of the derivation method with the generative method and the expert system to automatically generate the process specification. See Figure A4 in the Appendix for the principle diagram.
4.1.S Intelligent method (CAPP expert system)
Based on the specific information, it uses the process knowledge in the knowledge base and the human thinking to make a super-inference and make a decision, and finally design the process specification. It is the method that the generative method can actually apply today. See Figure A5 in Appendix A for the principle diagram. Selection of CP types
4.2.1 Enterprises with a large number of parts with a high degree of complexity or professional factories producing series products can use retrieval, generative and semi-generative methods. 42.2 Enterprises with many new products and small-batch production of complex types can use CAPP system in addition to retrieval, generative and semi-generative methods.
5 Functional requirements of CAPP
5. 1 Information input
5. 1. 1 Part basic shape;
Structural requirements:
Dimensions;
Pressure:
Material and roughness type,
Heat treatment information.
5.1.2 Information on production organization
Production differences, production system structure: JB/T 7701-95
b The energy of each production department and the batch of external cooperation, 5.1.3 Equipment and tooling information
Whether the specifications, performance and configuration of the tooling will be determined. 5.2 Information processing
Check the sample design process procedures:
Select the processing method
Arrange the processing route,
Select the tool:
Select the machine tool and equipment!
Quickly select the equipment;
Select the amount of cutting, the number of cores!
Calculate the number of steps before cutting;
Determine the process size and tolerance,
Calculate the material consumption, the processing time and processing costs, etc., and draw the process diagram.
5.3 Information Output
Output of manual process information
Process route table (or workshop division of labor list), its format should comply with the provisions of JB/Z187.4: process specification, its format should comply with the provisions of JB/Z187.3: material consumption quota list, its format should comply with the provisions of JB/Z187.4: process quota summary table on material file, its format should comply with the provisions of JB/Z187.4d.
Process equipment list, its format should comply with the provisions of JB/Z187.4.e.
The above information can be increased or decreased according to the requirements of the enterprise. 5.3.2 Auxiliary process information
The process information in 5.3.1 required by the factory computer system. 6. Formulation of process principles
(1 Basic requirements for formulating process principles
The formulation of process principles should be based on the structural characteristics of the parts and the specific process characteristics of the parts. Utilize the basic principles of process design and the experience of previous production practices, and with the guidance of relevant process experts, analyze and interpret, summarize and optimize the process principles. 6. Contents of process principles
6.2.1 Principles for selecting rough pieces
Determine the type of rough pieces and the rough piece processing method based on the material, basic shape, size, technical requirements, production batch and existing processing conditions of the parts. .
6.2.2 Principles of heat treatment
Determine the heat treatment method according to the functional requirements of the parts. 6.2.3 Division of labor in the workshop
Determine the tasks of each workshop according to the basic shape, functional characteristics, size, accuracy, heat treatment status and processing batch of the parts. 2.4 Arrangement of processing routes!
Arrange the processing lines according to the basic shape, functional characteristics, processing location, material and heat treatment status of the parts, processing batch and equipment conditions of each factory. 6.2.5 Principles of process generation
JB/I 7701-95
The material, shape, function, size, structure and production batch of the bucket determine the shape, size, accuracy and technical requirements of the processing parts of each process
6.2.6 Principles of machine selection
Consult the machine tool manual and instructions, the performance of the batch machine, the standard parts, and the processing methods and accuracy requirements of the parts.
6.2. Selection of process equipment Principles
Refer to the tooling manual and instruction manual, based on the performance, adaptability and conditions of the tooling and considering the processing methods and precision requirements of the parts.
6.2.8 Tooling alignment principle
Determine the tooling alignment method according to the process requirements. 6.2.9 Tool selection principle
Determine the processing parameters according to the requirements of the tooling processing equipment and heat treatment before and after the parts are processed. 6.2.10 Processing precision selection
Determine the precision of each process according to the design requirements and the requirements of the calculation. 6.2.11 Specific selection of elements
In mass production, automated production and special processing, the requirements for cutting are to be improved. The cutting method is determined according to the workpiece material, tooling material, processing method and the size and precision of the cutting part. 6.2.12 Principles of outsourcing installation
Determine the outsourcing work situation according to the enterprise's financial situation and sales force. 6.2.13 Determination of material customization
Calculate the material quota according to JB/ZA36.6. www.bzxz.net
6.1.11 Determination of working hours quota
Calculate the working hours quota according to JB/2338.6.
The description method and requirements of CAPP information are introduced. 1. Description method and requirements of each characteristic information 1.1.1 Description method of part information
7.1.1.1 Certified coding method
It is a coding system suitable for describing various types of parts. It can systematically describe the structure, shape, size, material, heat treatment, etc. of the parts (see [B/251 or JB/T524B.4). To capture the information of the parts, 7.1.1.2 Surface description method
The parts are composed of a basic production model and a set of continuous characteristics to describe each model. The characteristics of the model and the relationship between the plastic surface can be described by coding. 7.1.1.3 Body description method
The parts are composed of a basic three-dimensional geometric body connected in a certain position. A certain geometric body can be described by a set of continuous parameters. Each product corresponds to a processing method. 7.1.1.4 Feature modeling method
From the perspective of production, consider the geometric information and process information of the parts, and construct a part information model based on shape features. 7.1.2 Requirements for part information description
The overall standardization and unification of the parts should be required. When selecting and coding parts, a unified and standardized classification method should be used: when selecting and describing parts, the surface and body should be unified and standardized. 7.2 Description method of process information
7.2.1 Description method of process information
The description method of process information adopts information coding method, and its coding method should comply with the provisions of JB/T59S2. 2.2 Description of process principles
7.2.2.1 Decision table method
Use a table to express the process logic relationship that is not easy to express clearly in words. The format of the decision table is shown in Table 1Table 1
Condition items
Central items
7.2.2.2 Decision tree
Property conditions
Actions
A tree-like figure, consisting of a root, nodes and branches. The decision conditions are placed on the branches of the tree, and the actions (i.e., decisions) are placed on the end nodes of the branches. The form of decision making is shown in Table 2: Table
7.2.2.3 Production rule method
The form of the production rule is expressed in the form of "if this condition is met, then take this action". The form of the production rule is shown in Table 3, Table a
Select.
7.2.2.4 Framework method
Conclusion,
A data structure that describes a fixed event, state, or action, is a network composed of a set of methods that describe various aspects of the object. Each method can have different aspects, and each aspect can have different values. The content of the corresponding aspects and values can be data, tables, functions, or other subframes.
7. 2.2.5 Synthesize the above methods. 2.3 Requirements for process knowledge description The description of process information should be unified and coded. B Design steps of computer application software for CAPP system B.1 System requirements analysis Determine the object of the CAPP system to design process specifications, the process type of the system and the design goal of the system. 8.2 System function design JB/T 7701-95
To meet the system requirements, determine the functional modules that need to be established in the system and the relationship between each functional module, and draw a flowchart. 8.3 System Detailed Design
Design the system functional modules in detail, draw a diagram of each functional module, and refine each module in turn. 4 Selection of performance and performance
The selection of software includes the selection of computers (memory, external storage), printers and instruments, etc. The selection of software includes the selection of system software and supporting software, that is, the selection of operating systems, character systems, programming languages and database systems, and the design of graphics software, etc.
8. 5 Programming
Adopt the idea of modular design to shrink the application program, and compile program documents
Compile program instructions, use system maintenance and user instructions, and use the user operation. 8. 7 Program Testing
Test each functional module, and then test all functional modules in a unified manner. 9.1 Scientificity
The techniques, symbols, codes and output formats used in CAPP system shall comply with the relevant standards. 9.2 Rationality of structure
The process knowledge and process code (program) shall be separated, that is, the data shall be processed by database management system. 9.3 Operability
A good user interface shall be provided to facilitate operation. 9.+ Connectivity
The connection between this system and other systems shall be considered, and the needs of material requirement planning, manufacturing resource planning, group processing and flexible manufacturing systems shall be met. 9.5 Scalability
When completing the system functions, the needs of future expansion of the system shall be considered. 6 Fault-tolerant function
The system shall have a certain fault-tolerant function to meet the security protection requirements of the system and data under abnormal conditions. 9.In order to achieve universality and portability, the software can run in a variety of software environments, or be modified to be compatible with other hardware environments. A1 Principle of searchable CAPP system See Figure A1 for the principle. J6/T 0I-95 Appendix A Principle of various types of CAPP systems (reference material) Refer to each code and the process specification. Finally, whether there is a complete process specification basis, the screen display, and the print output can be obtained. Manually compile the process specification. A2 Derived CAPP system principle frame diagram Principle standard diagram A2.
Transfer sample process section
JB/T 7701-95
Input part code
Check parts for car washing
Is there a sample process route
Screen display
Edit, modify
Generate process flow
Print and edit
Human-machine interaction to learn process strategy
A3 semi-generative APP system principle block diagram
Original mail belt see Figure A3
Data library
Human-machine interaction||tt ||A+ New energy CAPH system principle diagram
JB/T7701-95
Input parts shrinkage information
Search for comprehensive data
Whether there is a sample line
Fa grid judgment
Automatically group
Production or process
Adjust process test, personnel policy reasoning
A5 Generative CAPT system principle block diagram
Principle diagram must be shown.
Process design
Model page
JB/IJ701-95
Auxiliary software
Integrated data library
Inference control
Automatic solution
Generate process specification
Print input
Input into parts room summary
Work information protection
Process strategy and health management
Institute, automatic
Self-physiology
Print output
Knowledge acquisition
Knowledge library
Process efficiency data and
Memory database
|Special amount
JB/T770195
Attached
CAPP system example brief introduction
(reference)
The CAPP system developed by CAM, an international computer-aided manufacturing company in the United States, is a typical nested and accumulative CAFP system. BI system principle diagram
The original system frame diagram is shown in 1.
Present defense text
Study partner group
This work is classified into two parts
B2 process procedure design
P2.1 input information
header information
process mechanism
Parts Process
Shao Jingwen Xu
Terms Used and Compiled
Sample Parts Process Model
Sample Parts Process
General and Compiled
Sample Method Sequence
Art Principle
Figure B1I-CAM CAPP System Original Diagram
Should Be Used in the Process
Steps in the Process
The relevant parts of the process should be coded according to the classification coding system stipulated by the system. First, the classification and total coding of the parts should be performed. In order to use the classification coding of the parts to retrieve the required parts, each component has its own inherent ability to determine and store in advance. The parts classification code and the parts group matrix file are formed by the code reflected from the base cabinet library, etc., and the parts group is confirmed. Then the relevant information about the parts production is entered, that is, the header part information in any process specification, such as product model, product name, part number, part format, product manufacturer, part material brand, variety, machine format, processing type, size, each part, production batch, etc. The input information of 1-CAM user is shown in the header part of Table B1, B2.2 Processing information
word sample two process path, check sample 1. Process path. The sample T. process is indicated by the process code, see Table 2, the process of the parts in the table is enough for the aircraft precision drawing set and two kinds of zero group to adopt the selected processing method, determine the process, the two-sequence surrogacy is enough for the feather word operation content of the classic two needle, women turn, stagger, stand, planing, grinding, pulling, clamping, inspection, etc. plus the four-body content is not set by the company, 9 serial numbers, years: 01, 02 ~ 99, etc., the 4-C3 in Table 32 is the three types of processes of the turn 1 account industry.
Li Shang system application sequence, limit the average of the parts, the worker with the certificate can modify the T. sequence content in the process described above. At the same time, H
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.