This standard is the fourth part of the general drawing and annotation method of mechanical drawings. This standard specifies the basic method of marking dimensions in drawings and is applicable to the drawing of mechanical drawings. GB/T 4458.4-2003 Dimensioning method of mechanical drawings GB/T4458.4-2003 Standard download decompression password: www.bzxz.net

GB/T 4458 Machine drawing 3 section oil method and method is divided into five parts Part 1: Yaoshu creative drawing
Drawing method
Part 2, machine drawing
Part 3, mechanical drawing
Waste distribution route, part number rotation and its arrangement method axonometric measurement
Part 4: Machine embedding library
Inch note Cen
Part 5: Emulsion drawing
Dimension tolerance allocation method
GB/T4458.4—2Q03
This part is the first part of GB: T4458. Part 6 replaces GBT4455.4-1984 Technical Drawing Dimension Notes: Compared with GB/T4458.4-1984, this part has the following changes: The seventh part "Simplified. Table Method" in the original standard is removed, and the relevant contents of GB/T166-5.1-19953 Technical Drawing Simplified. Representation Method Part Dimension Notes are quoted! A.1 Symbols and Proportions in the table are expanded: The slope indication and cone indication in the table are revised and supplemented. According to the requirements of GB/T1.120, the internal form of the original standard is rearranged: This part is fully unified by the Technical Product Standardization Technical Committee. This part was initiated by: Jinfei Institute of Science and Technology, Changan Automobile (Supply) Co., Ltd., Medical Standards and Metrology Information Research Institute of Four Provinces, Hefei University of Technology, Dakuhai University. The main responsible departments of this department are: Nuclear Lebai, Qiang Jiao, Huai De, Yuan Shou, Medical Li Ya, Li Zai, Li Xuejing, Ministry of Education, Zhou Jing: T
1 Garden surrounding
Mechanical drawing
Dimensioning method
The six parts are the basic methods for marking the size of the drawing. This part is applicable to the preparation of mechanical drawings.
2 Normative references
GB/T4458.4-2003
The following documents are used as references (this 44 58 of the present disclosure shall apply to the provisions of this part: All: 1st issue of the small application document and its subsequent amendments (not including the contents or revisions of the clauses) are not applicable to this part. The effective date of this part is 3/T1182 General rules for shape and position tolerances, definitions, symbols and drawing representations (V1 to 1101) T/1455.1 Technical drawings, types and simplified representations thereof (id1 TSO31: Technical System of Manufacturing Technology nTsosos-
TI3:T:4531
GB/T :3
Technical drawing dimensional tolerance notes (eg1S3319) B/15%7F,2 connection method pre-table method Part 2: Dimension notes 6B/183594 According to the final product 2 parts position, number and symbol A1) (d1S) 3096-S:997G1/:1906
Technical drawing
3 Basic rules
Drawing method light definition shape edge terminology and operation (IS) 1871:, 2, IDT) 3.1 The points of the parts should be based on the drawing The size of the drawing is based on the size numbers shown above. The size of the drawing is accurate. 3.2 Drawings (including those specified in the specification) are only allowed in meters. When the unit is meter, there is no need to mark the unit number (name). If other units are used, the corresponding unit symbols should be marked. 3.3 The dimensions marked in the sample are the dimensions of the parts in the drawing. In the subsequent completed dimensions, additional instructions should be given: 3.4 Each dimension of the parts is generally marked only once. The relevant markings are in the graphic area of ​​the station structure: 4 Dimension boundaries, dimension lines, dimension numbers
4. 1 Dimension boundary practice
4.1.1 The dimension boundary should be drawn with a thin solid line and should be drawn from the free-standing wheel, axis or symmetry center line. 5. Dimension boundary practice (Figure 1)
Dimension boundary method
CB/T 4458.4-2003 bZxz.net
.1.2 When indicating the mark of each point on the curve, the dimension line or its extension line can be used as the dimension cumulative line (Figure 3). 1
Dimension annotation method for curved wheels (I)
Figure 3 Dimension annotation method for curved wheels (II)
4.1.3 Dimension boundary: The dimension line should be perpendicular to the lower line of the ruler and tilted if necessary (Figure 4). pz:
Figure 4 Connection method of dimension boundary and dimension line 30
4.1.4 When marking dimensions at the transition point, use a thin solid line to extend the contour line, and the intersection point is called the dimension boundary (Figure 4). 41.5 The dimension boundary for marking angles should be drawn radially (Figure 5), and the dimension boundary for the length of the chord should be parallel to the perpendicular bisector of the chord GRT4458.2-2093
6): The dimension boundary for marking the length of the sub-chord should be parallel to the perpendicular bisector of the center of the circle (Figure 8).
Figure 5 Dimension boundary for marking angles
4.2 Dimension line
Figure Dimension boundary for marking chord length||t 4.2. Dimensioning method for large arcs: The dimensions are marked with the following two forms: a) Arrow: The front end is represented by the arrowhead, which is applicable to all types of drawings; 2H
Dimensioning method for arc length
6) Line: The direction and direction are indicated by the solid line. When the dimension is marked with a horizontal oblique line, the dimension line and the boundary line should be aligned with each other, as shown in Figure 1. The end of the dimension line is used as the end of the dimension line. Figure 9 The end of the dimension line
Figure 10 The oblique line at the end of the dimension line
When the dimension line is straight and the boundary line is straight, only this dimension line can be used. 4.2. When marking linear length, the dimension line should be aligned with the calculated line. The position of the center of the circle should not be replaced by the position doctor, and the length should not be drawn on the same length line as the map line 1.4.2.3 The original straight inspection and routine half-line center terminal should be drawn as a mushroom head and marked as shown in Figure 12. When the center position of the circle cannot be marked in the drawing, it can be marked in the form of Figure 13:. When it is not necessary to mark the center position of the circle, it can be marked in the form of 3.3
GB/T 4458.4-2003
LIO9X5
1! Dimension annotation method when the end of the dimension pin is in the oblique form Figure 12 Dimension annotation method of the circle and the diameter and arc radius IXI
GB 13 Dimension annotation method when the radius of the round neck is large
CB/T 4.2.4 When marking the seat, the ruler line should be drawn as a measuring or measuring point, with the center of the ruler being the same as the two points of the angle. 4.2.5 When the symmetrical machine figure is only halfway or slightly inside the blue, the ruler line slightly exceeds the boundary of the symmetrical center. At this time, only one full m is shown at the end of the dimension (Figure 1., 15): The dimension of the symmetrical part is marked with only one
arrow -
Figure 15 The ruler line of the symmetrical part is marked with only one
arrow (center B/4458.4-2003
4.2.6 When there are not enough position arrows or marking numbers, the middle mark
form is used. When the north is in the north, the measuring point or oblique load is used to represent the small dimension
4.3 Dimensions 4.3. The numerals of linear scales are written above the scale line. It is also allowed to write them at the interruption of the scale line (Figure 2). Figure 17 The position of the numerals in the dimension line. 4.3.2 The direction of the scale numerals. There are two writing methods below. Generally, method 1 is used: When it does not cause misunderstanding, method 2 is also allowed. However, in a sheet, the method 1 should be used: the numerals are written in the direction shown in the control diagram, and the length should be marked within 30 degrees. When the length is reduced, the standard method in Figure 15 can be used. For non-horizontal scales, the horizontal numerals are written at the interruption of the numeral line (2, Figure 3): Figure 18 The direction of the numerals in the dimension line. Figure 20 The non-horizontal scale is marked (a) GB/T 4458.4--2003
Around 13 to the left 30* Standard size writing 6
Figure 21 Non-horizontal dimension notes (II) 4.3.3 Angles are all horizontal, generally written at the break of the scale line Figure 22. It must be in the form of Figure 73.
Figure 22 Angle number writing position, I) 23 Angle number writing position (II)
4.3.4 Dimension numbers can be written as follows: No, the width will be broken and <Figure 21), GB/T 4458.42003
5 Sample dimension symbols and writing words
AXM6 6H
Dimension numbers are not passed by any two lines Figure 24
5.1 The symbols and writing time of dimension marking shall comply with the provisions of Appendix A. 5.2 When marking the diameter, the symbol \ shall be placed before the digits of the dimension. When marking the half-diameter, the symbol "R" shall be placed before the small digits of the dimension. When marking the spherical diameter, the symbol "X" or "X" shall be added before the small digits. For the axis, frequency, and F, the symbol \S\ shall be used when there is no misunderstanding (Figure 2). 43
Figure 25 Method of spherical dimension (I)
Figure 26 Method of spherical dimension (II)
5.3 When marking the length, the When marking multiple dimensions, add brackets or "-" to the left of the dimension numeral (Figure 27). 5
Method of dimension annotation
GB/14458.4—2003
5.5 When marking the dimensions of the average of the surface and the shape, you can add the symbol "Figure 28, or use the meaning of "2R, 1" before the dimension of the square side length, and annotate the opposite distance of the positive shape
Figure 28 Method of dimension annotation of square structure
5.6 When marking the size of plate-like parts, you can add the symbol "-" before the small number of the dimension. \\ (Figure 29 Simplified Notes for Vibratory Parts
Figure 30 Notes for Radius Dimensions when Special Requirements are 5.7 When it is necessary to indicate that the radius dimension is determined by other dimensions, use a line and the symbol "R\ to indicate it. Do not write the dimension number. Figure
(iB/14458.4—20D3
5. When marking the slope or the shop, the marking should be in the direction shown in the table. Table 1 Slope and Cone Marking Examples
Marking Examples
Only real production examples
5.945\ In order to make the chamfers connect to the "Figure", the non-45 chamfers are marked in the form of Figure 32. Figure 3
45\ Example angle
6 Simplified
Figure 32 Non-45 chamfer annotation method
The dimensioning method is in accordance with GB/T6S75.2:7 Undefined shape edge annotation method
CB/Gate 4458.4-7C03
When it is necessary to specify the edge shape and give the limit reflection requirement, GB/=190S6/15137132090 shall be considered for annotation.
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