GB/T 4458.3-1984 Mechanical Drawing Axonometric Drawing GB/T4458.3-1984 Standard Download Decompression Password: www.bzxz.net

National Standard of the People's Republic of China
Mechanical drawings
Axonometric drawings
This standard specifies the basic method of drawing axonometric drawings. National standards related to this standard:
GB4457.4-84 "Mechanical drawings
Drawings"
1 General provisions
1.1 Axonometric drawings generally adopt the following three types:
1.1.1 Orthometric drawings, referred to as orthometric drawings (Figure 1). 1.1.2 Ortho-isometric drawings, referred to as ortho-isometric drawings (Figure 2). 1.1.3 Oblique-isometric drawings, referred to as oblique-isometric drawings (Figure 3). Cube
={=r=!
Published by the National Bureau of Standards on July 11, 1984
UDC621.71:744
.4:621.824
GB 4458.3—84
Replaced GB128—74
Axonometric axis confidence
Implemented on July 1, 1985
Supported cube
4 —1/2
Other axonometric drawings are allowed when necessary.
The position of the axonometric axis
1.2 The position of the axonometric axis and the axial deformation coefficient GB4458.3—84
41 =1/2
The position of the axonometric axis
When drawing the orthogonal and diorthometric, the position of the axonometric axis (X, Y and Z) and the simplified deformation coefficients (p, 9 and r) of each axial direction shall be in accordance with the provisions of Figure 1 and Figure 2.
When drawing the oblique diorthometric, the position of the axonometric axis (X, Y and Z) and the deformation coefficients (p1, 91 and r1) of each axial direction shall be in accordance with the provisions of Figure 3. 2 Drawing method
2.1 In an axonometric drawing, only the visible part is generally drawn, and the invisible part is drawn only when necessary. 2.2 The circle parallel to each coordinate plane (such as the diameter &) is projected as an ellipse in various axonometric drawings (the front projection in the oblique diorthometric is still a circle) as shown in Figures 4 to 6. wwW.bzxz.Net
The major axis of circle 1 is changed to B
The major axis of circle 2 is perpendicular to the major axis of circle F
The major axis of circle 3 must be about the axis
The measured major axes are:
AH ::1.32d
The minor axis of the line:
GB4458.3—84
The major axis of ellipse 1 is perpendicular to the z-axis
The major axis of ellipse 2 is perpendicular to the x-axis
The major axis of ellipse 3 is perpendicular to the axis
The major axis of each circle:
ABrel.08d
The minor axis of ellipse 1 and 2:
The minor axis of ellipse 3:
C, D, 0.94 d.
The major axis of the medullary circle 1 is at an angle of 7° to the X-axis
The major axis of the ellipse 2 is at an angle of approximately 7° to the z-axis
The major axes of the ellipses 1 and 2:
AB 1.06 d
The minor axes of the medullary circles 1 and 2:
C D-0.33 d
2.3When representing the internal shape of a part, it is possible to imagine that a part of the part is cut away by a cutting plane. Section lines in various isometric drawings should be drawn according to the provisions of Figures 7 to 9.
In isometric assembly drawings, adjacent parts can be distinguished by drawing section lines in opposite directions or at different intervals (Figure 10). Figure 8
GB4458.3—84
2.4 When the sectioning plane passes through the longitudinal symmetry plane of the rib or thin wall of the part, these structures are not drawn with section symbols, but are separated from the adjacent parts by thick solid lines (Figure 11); when the representation in the figure is not clear enough, it is also allowed to use fine dots on the rib or thin wall to represent the sectioned part (Figure 12).
GB4458.3—84
2.5 When indicating that the part is broken in the middle or partially broken, the boundary line of the break should be drawn with a wavy line, and fine dots should be added in the visible fracture surface to replace the section line (Figure 13, 14).
2.6 In the axonometric assembly drawing, when the sectioning plane passes through the axis of solid parts such as shafts, pins, bolts, etc., these parts should be drawn as unsectioned.
3 Dimensioning method
3.1 The linear dimensions of the axonometric drawing should generally be marked along the axonometric axis direction. The dimension value is the basic dimension of the part. The dimension number should be marked above the dimension line according to the corresponding axonometric drawing. The dimension line must be parallel to the marked line segment, and the dimension limit line should generally be parallel to a certain axonometric axis. When the letterhead appears downward in the drawing, the mark should be drawn out and the number should be written in a horizontal position (Figure 15~17). Figure 15
GB 4458.3—84
3.2 The diameter, dimension line and dimension limit line of the circle should be parallel to the axonometric axis in the plane where the circle is located. When marking the radius of the arc or the diameter of the smaller circle, the dimension line can be drawn out from (or through) the center of the circle, but the horizontal line of the number must be parallel to the axonometric axis (Figure 18, 19).
3.3 The dimension line for marking the angle should be drawn into an elliptical arc corresponding to the coordinate plane. The angle number is generally written at the interruption of the dimension line with the letterhead upward (Figure 20).
Appendix A
How to draw isometric pipeline diagrams
(reference)
A.1 All pipelines in isometric diagrams shall be drawn with thick solid lines. GB4458.3——84
A.2 For winding spatial pipelines, if they are inclined in a plane parallel to the horizontal projection plane, draw a thin solid line parallel to the Y axis; if they are inclined in a plane perpendicular to the horizontal projection plane, draw a thin solid line parallel to the Z axis, see Figure A1. Z
A.3 When intersecting spatial pipelines intersect on an isometric diagram, the obscured pipelines shall be drawn disconnected, as shown in Figure A2. A.4 The connection form of the pipeline in the pipeline diagram, the drawing method of valves, plugs and other accessories shall be drawn as isometric schematic symbols according to the symbols specified in GB141-59 "Specified symbols for pipeline parts, accessories and thermal engineering, sanitary engineering, instruments and equipment in mechanical drawing schematics". These symbols must be listed on the isometric pipeline schematic diagram, as shown in Figure A2. A.5 Example of isometric pipeline schematic diagram (Figure A2). Name
GB4458.3—84
Isometric schematic diagram
Appendix B
Isometric exploded diagram
(reference)
GB4458.3—84
B.1 The separated parts are arranged in the corresponding axis positions according to the order of assembly and disassembly, as shown in the figure. B.2
Different parts should be numbered differently.
3 The surface of the parts can be retouched.
Example of isometric exploded diagram (see figure).
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