Controls the fillet radius of the extrusion
Controlling the fillet radius of the stretched piece is divided into the fillet radius control of the bottom of the stretched piece and the straight wall, and the fillet radius control of the stretched piece flange and side wall. The fillet radius of the bottom of the drawing piece and the straight wall should be larger than the thickness of the sheet. In order to ensure the fabrication quality, the fillet radius of the bottom of the drawing piece and the straight wall should not exceed 8 times the thickness of the sheet. The fillet radius of the flange and side wall of the drawing part is similar, and the large fillet radius of the flange and side wall of the drawing part of the automobile sheet metal part should also be controlled within 8 times of the thickness of the sheet, and the flange of the drawing part should be controlled within 8 times of the thickness of the sheet. The radius of the small fillet with the side wall should be higher than twice the thickness of the sheet.
Controls the adjacent fillet radius of rectangular extrusions
The value of the adjacent rounded corner radius of the rectangular stretching piece should be strictly controlled. The rounded corner radius between the adjacent two walls of the rectangular stretching piece should satisfy r3≥3t, and in order to reduce the number of stretches, r3≥H/5 should be taken as far as possible. Easy to pull out at one time.
Controlling the diameter of the inner cavity of a circular extrusion
In order to ensure the overall stretching quality of the circular stretched part, the diameter of the inner cavity should be controlled to be no less than the sum of the circular diameter and ten times the thickness of the sheet, so as to ensure that the circular stretched part does not wrinkle inside during the stretching process.
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