Design and Calculation of Main Parts of Drawing Die
1) drawing die gap
(1) the first drawing gap Z = 1.1t = 1.1mm
(2) The final deep drawing gap Z = 1.0t = 1.0mm
(3) rounded Z = 1.1t = 1.1mm
2) the fillet radius of the drawing die
(1) the first drawing die radius radius ra take 10t, that ra = 10mm, punch radius rt take 6t, that rt = 6mm.
(2) the final drawing die radius radius ra take 9t, that ra = 9mm, punch radius rt take 8t, that rt = 8mm.
3) the size of the working part of the punch and die and tolerance
(1) the first working die drawing die size. According to n-1 times the process shape and size of the design, mold tolerance by IT11 level requirements. Punch size to die with the actual size can be done with the guarantee, punch head shape to be designed to work with the cross-section of the same octagon requirements, the four sides of the transition to 450 straight-arm hypotenuse.
(2) n-1 times the initial punch punch ramps start size
A '= A-1.17rp = 196-1.17X8 = 186.64mm
B '= B-1.17rp = 116-1.17X8 = 106.64mm
(3) the first deep drawing parts height
H1 = 0.88H = 0.88X100 = 88.00mm
(4) the final drawing parts punch and die size and tolerance
Workpiece requirements of the external dimensions, it is necessary to design the size of convex and concave die design standards for the die, mold manufacturing tolerance as IT10 level.
Die size:
Aa = (A - 0.75?) = (196 - 0.75X0.54) = 195.6 mm
Ba = (B - 0.75?) = (116 - 0.75X0.39) = 115.707 mm
Punch size:
At = (A - 0.75? - Z) = (196 - 0.75X0.54 - 2) = 193.6 mm
Bt = (B - 0.75? - Z) = (116 - 0.75X0.39 - 2) = 113.707 mm
(5) concave die fillet size (part of the rounded corners require size)
Ra = (r - 0.75?) = (8 - 0.75X0.22) = 7.835 mm
Rt turn = (ra turn -0.76t) = (7.835-0.76X1) = 7.075 mm
Above all kinds of △ for drawing pieces of dimensional tolerance, according to IT13 level
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