Configuration criteria of deep drawing parts
a. The shape of drawing parts shall be as simple and symmetrical as possible.
b. The size proportion of each part of the drawing part shall be appropriate, and the design of wide flange and deep drawing parts shall be avoided as far as possible. (D convex ＞ 3d, h ≥ 2d) Because such parts need more drawing times.
c. The fillet radius of the drawing part shall be appropriate, and the fillet radius shall be as large as possible to facilitate the forming and reduce
the number of drawing times.
(1) Fillet radius of drawing parts. Rapid screening sheet metal sample library
(2) The appropriate position for punching deep drawing parts or bending parts.
(3) To prevent distortion and deformation during drawing, the width of A and B should be equal (symmetrical), that is, A=B.
(4) Precautions for dimensioning on the design drawings of tensile parts
The material thickness after stretching changes due to the different stress magnitude of the stretching parts. Generally speaking, the original thickness is maintained at the bottom center, the material at the bottom fillet becomes thinner, the material at the top near the flange becomes thicker, and the material at the fillet around the rectangular stretching piece becomes thicker.
(5) Standard method for product dimensions of tensile parts
When designing tensile products, the dimensions on the product drawing shall clearly indicate that the external dimensions or internal dimensions must be guaranteed, and the internal and external dimensions cannot be marked at the same time.
(6) Marking method for dimensional tolerance of stretching parts
The internal radius of the concave convex arc of the stretch piece and the height tolerance of the cylindrical stretch piece formed at one time are symmetrical deviations on both sides. The deviation value is half of the absolute value of the national standard (GB) Grade 16 accuracy tolerance, and is marked with ±.