The use and management of engineering drawings in machinery manufacturing industry becomes more and more complicated with the increase of product types and quantities, especially when the development and application of modern information technology puts forward higher requirements on the management of drawing information and affects the production organization, planning management and financial management of machinery products. In machinery manufacturing enterprises, when the number and type of products manufactured are small, the management of engineering drawings is relatively easy. The application of modern management technologies such as CAD/CAM computer-aided design and computer-aided manufacturing, PDM product data management and ERP enterprise resource planning requires more reasonable and standardized drawing code information. Therefore, it is necessary for modern enterprises to standardize the coding of product drawing numbers to meet the needs of modern enterprise information management.
First, the drawing number preparation or coding of several principles.
1, the preparation of drawing number is the enterprise product design, process preparation, production organization, operation management, financial statistics of the basic information code and basis, is the basis of enterprise information technology data or data sources.
2, the systematic nature of the drawings according to the selected things, the properties or characteristics of the concept in a certain order to be serialized, forming a reasonable classification system.
3, uniqueness of a code can only uniquely identify a classification object.
4, normative code format, the code format must be uniform.
5, taking into account the format of existing codes to facilitate consideration of management and custom.
6, continuity and expandability, creating conditions for the next level of information management.
7, with more than two quantities of drawings to describe the same part or component using the same drawing number.
8, the specific number of bits of drawing number preparation and the composition of enterprise products, the number of product types, the development of enterprises and other factors. Generally speaking, in meeting the principle of not changing the code in a longer period of time as a prerequisite, should be able to continue for 30-50 years, under this condition to reduce the total number of bits as much as possible.
Second, the method of composition of commonly used engineering drawings drawing number.
Figure number can be a number or several number composition. In the information technology database corresponds to the fields of the database. Each drawing number is placed in a separate box in the title field. A figure number (field) often uses a few or a dozen characters as the code for the figure number.
as the code for the diagram number. Commonly used drawing numbers usually take into account the following product or drawing characteristics or attributes.
1. the contract number, the contract code at the time the contract was signed.
2. the affiliation number, which indicates or expresses the relationship between parts or components.
3, major classification number, divided according to a certain function or type of attribute (can be coded to a certain attribute or characteristic of the part or component).
4, small classification number, according to a certain function or type of attribute division (can be coded into a part or component of a property or feature).
5, drawing width feature codes, such as: A0, A1, A2, A3, A4.
6, equipment location classification codes, such as the code for equipment at a particular segment of the process location in a project.
7, drawing sequence number code, the natural sequence number of the drawing, usually prepared in a contract or in a project.
8, material characteristics code, indicating the material properties of parts, components, weldments, non-ferrous metals, rubber products, etc..
9, professional characteristics code, indicating the code distinct from the mechanical profession, such as hydraulic profession, electrical profession, etc..
10, parts and components differentiation code, such as parts, welded parts, assemblies, parts, etc..
11, technical document type code, usually refers to a variety of technical documents, including manuals, technical conditions, etc..
12, storage disc code, the code of the disc when burning the disc.
13, storage path code in the network server, applicable to all files stored in the server hard disk.
14、Archival cabinet number, the number of the archival cabinet where the drawings are stored.
15、Inherited drawing number, the drawing modified by the drawing of a part or component, the drawing number of the drawing before modification.
When multiple numbers are used generally add each number in a different box, and the code in each box has a different meaning.
Third, the drawing number using the characters
Arabic numerals 0-9.
English letters A-Z (except I, O).
short horizontal line -; dot -; slash / .
As a rule, short horizontal lines, dots, slashes should not be used as far as possible.
Fourth, the relationship of the figure number
Figure number in the preparation of two principles are often used, both with affiliation and not with affiliation of the coding principle.
Most of the preparation of domestic diagram number with affiliation, while most of the foreign product diagram number does not come with affiliation. The two kinds of figure number relationship in the design, production organization and other aspects of a large difference.