4工艺计算4. 1 模具材料的选用零件材料为10钢，有很好的冲压性能。

4 Technological calculation <br>4. 1 The material of the die <br>is 10 steel, which has good stamping performance. According to the selection principle of stamping die materials, the material of the punch and die is Crl2MoV. After processing, the material is tempered and heat-treated to make its hardness reach HRC58 ~ HRC62. <br>4.2 Calculate the blank size <br>From Figure 1 we can see that the thickness of the plate r = 2 mm> l mm, so it is calculated according to the thickness of the plate. Workpiece outer diameter d, = 75 mm, inner diameter order = 42 mm, height A = 22 mmo The trimming margin 3? = 3.0mm from literature [2], so the actual outer diameter is calculated by pressing = 75 + 3.0X2 = 81 mm Calculation. From the literature [2], the rough diameter D = 帿 术 +4 圓 一 3.44 to R100 mm. 4.3 Determining the number of <br>drawing operations The drawing coefficient d / D = 42/100 = 0.42. The limit drawing coefficient of the material is 0.58 ~ 0.48 from [2]. Since 0.42

4 Process calculation<br>4. 1 Selection of mold materials<br>Part material is 10 steel, has good stamping performance. According to the principle of the selection of stamping mold materials, the materials of the convex mold and the concave mold are selected crl2MoV, and the heat treatment is carried out after processing, so that its hardness reaches HRC58 to HRC62.<br>4.2 Calculating blank dimensions<br>Figure 1 can be seen the thickness of the plate r 2 mm , l mm, so according to the thickness of the plate diameter size. The outer diameter of the workpiece d, s 75 mm, the inner diameter of the number of 42 mm, the high degree A , 22 mmo by the literature , the trim edge margin 3? 3.0mm, so the actual outer diameter is calculated by hitting the beat s/he 3.0X2, which is 81 mm. Calculating the diameter of the blanks by the text of the contribution of the blanks, D, and 4 groups of one of 3. 44 with R100 mm. 4.3 Determination of the number of deep formings<br>Pull-down coefficient d/D s 42/100 s 0. 42, by the literature of the material's limit pull depth coefficient is 0.58 to 0.48. Since 0. 42

4 process calculation<br>4.1 selection of mold materials<br>The part material is 10 steel, which has good stamping performance. According to the selection principle of stamping die material, Crl2MoV is selected as the material of punch and die. After processing, the material is subject to tempering heat treatment to make its hardness reach hrc58-hrc62.<br>4.2 calculation of blank size<br>It can be seen from Figure 1 that the plate thickness r = 2 mm > L mm, so it is calculated according to the plate thickness mid diameter size. The outer diameter of the workpiece D, = 75 mm, inner diameter times = 42 mm, height a = 22 MMO. According to the literature [2], the trimming allowance is 3? = 3.0 mm, so the actual outer diameter is calculated as hit = 75 + 3.0x2 = 81 mm. According to the reference [2], the diameter of the blank is calculated as d = 0.4 + 4-3.44 and R100 mm. 4.3 determination of drawing forming times<br>The drawing coefficient D / D = 42 / 100 = 0.42, and the limit drawing coefficient of material obtained from reference [2] is 0.58-0.48. Due to 0.42