Representation of thread

 

Description Summary

The internal thread is generally open to indicate,

In the non-circular view, the thread base (large diameter) is represented by a thin solid line (not drawn into the chamfer area);The tip of the thread (small path) and the thread termination line are represented by the thick solid line; The section line in the diagram should be drawn to the thick line indicating the path.In the view of the visible circle, the small path draws the full circle of thick solid lines, and the large path draws about 3/4 circle of thin solid lines.

Specified drawing of thread

The top of the tooth is represented by a thick solid line (large diameter line of external thread, small diameter line of internal thread).

The tooth base is indicated by a thin solid line (small line ofexternal thread, large diameter line of internal thread).

On a view projected as a circle, the thin solid line circle representing the tooth base is drawn only about 3/4 of a circle.

The thread termination line is represented by a thick solid line.

Whether it is internal or external thread, the section line on the section view or cross-section must be drawn to the thick line.

When it is necessary to indicate the end of the thread, the tooth line of the screw tail part is 30° from the axis.

Summary

b (a) when the internal and external threads are screwed, the screwing part shall be represented by the representation of the external threads;

a (2) The unhinged parts are still represented by their respective representations;

(3) The configuration and rotation of thescrew hole

Due to the drilling of light holes before tapping, therefore, the depth of drilling and the depth of screw holes should be drawn respectively, and the reason for the existence of screw tail should be taken into account when spinning, the length of spinning should be less than the depth of screw holes, and attention should be paid to the drilling cone Angle at the bottom of the hole 120°, and not marked.