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Standard SJ2735-86 of the Ministry of Electronics Industry of the People's Republic of China
Rules for Drawing Electronic Product Drawings
Issued on December 15, 1986
Implemented on December 1, 1987
Ministry of Electronics Industry of the People's Republic of China
Standard of the Ministry of Electronics Industry of the People's Republic of China Rules for Drawing Electronic Product Drawings
This standard applies to the drawing of electronic product drawings. SJ2735-86
This standard is formulated on the basis of the national standards GB4457~4463-84 and GB131--83 "Mechanical Drawing" and combined with the characteristics of electronic product drawings. Main standards related to this standard:
GB5489-85 "Printed Board Drawing"
GB4728-85 "Graphical Symbols for Electrical Drawings" GB5094-85 "Item Codes in Electrical Technology" S3207-85 "Management System of Design Documents" 1 General Principles and General Provisions
1.1 General Principles
1.1.1 When drawing product drawings, the convenience of viewing should be considered first. According to the product structure and shape characteristics, choose the appropriate expression method. On the premise of fully and clearly expressing the shape of each part of the product, strive to minimize the number of views and simplify the drawing.
1.1.2 Product drawing method and simplified drawing method: Technical requirements and codes (symbols) should comply with the provisions of relevant national standards and departmental standards. When there is no deviation from relevant national standards and departmental standards, their meaning can be explained in the drawing. 1.1. Product drawings should be able to express the composition, structural shape, dimensional tolerance, shape and position tolerance, surface roughness, materials, coating, heat treatment and other technical requirements of the product. 1.1.4 Generally, there should be no process description on the product drawing. However, in special cases, in order to ensure product quality, when a certain process must be specified (such as "joint grinding", "precision reaming", "matching drilling", "single bending", "expansion riveting", etc.), these process descriptions can be listed on the drawing. 1.1.5 Only one product can be made on a drawing with a code, but products of the same type or series can be used in a table diagram and given a code guide respectively (Figures 1 and 2). Released by the Ministry of Industry on 1986-12-15
Implemented on 1987-12-01
XXe.034.411
XX8.034,412
XX6.034.413
XX8.034,414
SJ2735--86
$28.8+0.13
Φ28.8+o.13
中28.8*0.13
20±02
089·0||tt ||80±0,5
Tables and Figures--Drawings of products with the same structure and reference or requirements as those of other systems using graphics and tables 2-
SJ2735--86
XX8,801.052-1
XX8.801.052-2
Xx8.801.052--3
XX8,801.052-
1.1.6 For printed board assembly drawings, etc., the H symbol method can be used to draw the drawings (Figure 3) under the premise of clearly indicating the assembly relationship.
For printed board parts drawings and integrated circuit chip drawings, etc., the coordinate method can be used to mark the dimensions (Figure 4). Figure 9
1.1.7 Product drawings should generally be drawn on a single sheet of standard format. When drawing on several sheets, each sheet shall be marked with the same code, and the main view, technical requirements, and detail column shall be placed on the first sheet.
1.2 General provisions
1.2.1 The code for the drawing format is a symbol with letters on the left and Arabic numerals on the right, such as A3, B3, C5, etc.
1.2.2 The extended drawing format is represented by the extended code "J", such as "3J" for extended A3 format. 1.2.8 The scale on the drawing shall be in accordance with the rules in Table 1, and the smaller scale shall be the larger scale. Note: Five is a positive integer.
1.3 Arrangement described in the drawing
SJ2735--86
11.5121t2.51:31:4
115 1:1on 1:1.5x10m
1+2×10
112.5×10m
1:5×1n2
1.51 2r1 2.5:1 3t1 4t1
51 (10+n)1
1.9,1 The technical requirements on the drawing should be concise, clear and clear, and generally use the following three forms: a, separate clauses,
c. List table (such as coil data table, gear data table, etc.). 1,3.2 Technical requirements are generally written above or on the left side of the main title bar. 1.3,3 The guide line used for marginal notes shall be drawn with a thin solid line. The guide line shall point to the place it is pointing to and draw a dot (Figure 5). If it is not appropriate to draw a dot at the place it is pointing to, an arrow can be drawn (Figure 62, Figure 63, Figure 64). If several contents are marked on a guide line, they can be written separately (Figure 6, Figure 59, etc.). 2
Climbing drawings
SJ2736—88
Part drawings are drawings used for manufacturing and inspecting parts. 2.1 Contents of part drawings
Part drawings shall generally include the following contents:
Self-, the necessary number of views that can express the shape and structure of the part, 2
Corner text
According to/x52-24
b. Determine the metal dimensions, dimensional tolerances, shape and position tolerances of the part shape and structure, requirements for surface conditions (surface roughness, plating, etc.), heat treatment, lettering and symbols, etc., materials, weight, proportions, and other technical requirements and instructions.
2.2 Drawing of part drawings
2.2.1 Part drawings must be drawn according to the shape, size and surface conditions required for part design and assembly.
2.2.2 The dimensions and requirements of parts that need to be processed during assembly should be noted in the part drawings and assembly drawings respectively.
2.2.3 For parts with positive and negative requirements for materials, the positive or negative side should be indicated in the drawing. 2.2.4 When the grain direction of the material must be indicated, it can be marked according to Figure 7. 2.2.5 When the view cannot fully express the shape of a part of the part or it is inconvenient to mark the size, the expansion view of this part can be drawn at the appropriate position of the drawing, and the word "expand" can be marked above it (Figure 8). If necessary, the expansion view of the whole part can also be drawn (Figure 9). 5-
40°±30
20°±30
: 20+30
120±30
sJ273588
2404302
8-way expansion
2.2.6 Parts of the same type or series can be drawn using a table diagram (Figures 1 and 2). 2.2.6.1 The variable parameters of the table diagram may include: size, limit deviation, marking, material, re-plate, coating, 6-
heat treatment, technical requirements, etc.
SJ2785—86www.bzxz.net
2.2.6.2 The view of the table diagram should be drawn in proportion to one of the specifications in the series. 2.2.7 Structures similar to spiral shapes such as filaments and high-frequency wires can be drawn according to Figure 10. Figure 10
2,2.8 For double-helix cylindrical filaments (such as electron tube filaments), an expanded diagram (Figure 11) can be drawn. 5
Winding data
Total number of wires
Expanded length
Single spiral
Double spiral
2,2.9 Drawing and marking of knurling
2.2.9.1 Straight knurling is represented by thin solid lines parallel to the axis. Net knurling is represented by two sets of parallel thin solid lines that cross each other and form an angle of 30° with the axis. The distance between adjacent parallel lines is 1 to 4 mm, which can be selected according to the size of the pattern. The distance between lines should not change in the projection diagram.
2.2.9.2. Knurling can be simplified by drawing the knurling near the contour line (Figure 12). If only part of the surface of the part is knurled, the boundary of the light knurling should be drawn with a thin solid line (Figure 13). —7
Network effect 0.8
SJ2735--80
Separation effect 0.8
2×45*
2.2.9.3 The dimensions marked on the painted part are the dimensions after knurling. If it is the dimension before knurling, the words "before knurling" should be noted on the right side of the dimension number (Figure 13). 2.210 When multiple coatings are used on the surface of the part, different symbols can be specified (Figure 14). 2.2.11 If the surface of the part is the same coating, and part of the surface has sector coating, fill in the basic coating mark in the "coating" column and add the words "and show drawing" after it. On the drawing, use thick dot-dash lines to draw the local coating sample drawing and make notes on the side.
Special surface number in the figure
Bonding
Its and x are the most important metallized connection.
2.212 When heat sealing plastic parts, use The thick dotted line indicates the sealing position, and the marginal notes indicate the sealing requirements (Figure 15).
2.3 Dimensioning method for part drawings
SJ273688
Heat efficiency width 2
2.3.1 In the same drawing, the dimensions of several identical factors should be concentrated on one element as much as possible (Figure 16).
--3·5
2,8.2 In the same drawing, the size and number of hole groups Can be expressed in a list (Figure 17) 9
sJ2785-86
Color number
2.3.3 In the same figure, the same multiple door size can be marked in the form of Figure 18, the number of platforms, shape, outer diameter and height, (inner hole diameter and depth). —10-
2.3.4 Dimension annotation method for multiple circles
SJ2735—86
3 Quotient 104 (. 430)
Guozhu Shang 80 (voucher 20)
Figure 18
2.3.4.1 For multiple circles with one center and multiple arcs with the center on a vertical line, the dimensions can be marked in sequence from the center of the circle outward on the extension line of the dimension line according to Figure 19a, b Figure 20a, b, but the dimension line must pass through all arcs and only one arrow is required.
R7, RID, R14
R8, R5, RG
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