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Military medicine cabinet under the counter forming process and die design

Degree K = 982.2ram. According to (} / b) × 100 = 0.049. / B: 0.59,[link widoczny dla zalogowanych], look-up table shows the number of drawing n: 2. (2) School School stretch factor. By the formula ml = R / '0 .5 D a 0.707q),[link widoczny dla zalogowanych], where = B = B A and a 50t = 471-115 = 356nun,[link widoczny dla zalogowanych], can be obtained m 【: 80/226.2 = O. 354. According to the numerical investigation ml (stamping Manual> Table 4-15 know m. <[M.】 = 0.55, indicating that stretching a problem. These are in accordance with the angular separation and Verification (n-1) ultimate tensile Chung-factor approach to checking the. then rectangular pieces respectively 1st and 2nd check tension coefficient of the formula: ml: Rl / R = 80/153: 0.52,: 40/80; 0. 5, No. 1 tension coefficient and the cylinder close to the allowable tensile coefficient, 2nd stretch factor and allow the tension coefficient of cylindrical pieces were quite different. rectangular drawing with material transfer coefficients comparable ultimate tensile round tube smaller pieces. and then aluminum drum washing machine according to the existing tension data, aluminum 【m.】 = 0.3-0.35, [J, l2】 = 0.4-0.45; Abdullah Al 【m .】 = O.35 a O.4, a 【m2J = O.45 O.55, and ml, the foot compared to that required to meet the stretch factor. Laundry inside the barrel pulled into tension as the criteria to determine whether different size is not very different, but the tension is very different times. designed J, I. and 17/.2 also a little adjustment, considering the success of the 1st stretch, 2nd pull fails, there are remedies Yak, it continues to draw the parameters of the above calculation process parts shown in Figure 2. Figure 2 mold machining process is completed parts diagram by test mode, although successful, but because there is no double-action press. only 4 column 300 ~. N and 5 deleted hydraulic press. The first 2 blank holder can not adjust the tension, pressure and the gap can not be adjusted as well, often resulting in crack. the way to solve this problem can be modified equipment, but no time. If you look at the product mix changes size, change some parameters, change the 2 to 1 times the tensile stretching, can solve the equipment problems, but also eliminates the need for bulging under the counter before the annealing process. After consultation with the customer, will =, ~ ram into R = 50nan meet the technological requirements after. After estimation, taking R = 50nan still in the transition state, must take measures conducive to stretch, which increase the radius of die, take rd = 25-30ran, taking a single gap .25 t, corner clearance to take 1.3t, mold surface roughness ugly. ≤ 1.6ftm. in the production must be both sides of lubrication, lubricants, molybdenum disulfide used by the trial plus lard and additives, such as adjusting the blank holder force measures. drawing die structure shown in Figure 3. test mode and found that stretch with u is not successful, not successful aluminum stretch, then switch LF2 aluminum alloy tensile manganese as 201 power. LF2's :108-142NPa, = 49MPa.】 o = 19%, the yield ratio / = 0.4, smaller than I.F2 is conducive to lowering tension coefficient. Therefore, material from the LP2 to LF1, rejection rate at 3% 0-57oo, to normal production. 123 A dry tensile modulus of the structure 4567891o Week 3 1. on the template 2. discharge spring 3. Die 4. guide sleeve 5 pillar 6. stripper plate 7 blank holder 8. punch 9. top stalk l0. under the floor II. Plate Section 4 bulging mode structure is a rectangular box under the counter drawn parts, bulging is large. bulging deformation rate with extended more appropriate definition of the volume change rate change rate and area are not suitable. outside the port area near the deformation of the biggest, = 10.5% <19% × 0.75 = 14.3%, the elongation of tendon pressure at the end 8: 11% (14.3%. under the counter through the stretched thickness of the situation is outside the mouth part of the thickening, there are no major changes in the thickness of the bottom. elongation from the material are beyond the maximum term investment, the pressure outside the mouth of the bottom bars and After the analog part of other process parameters, but also allowed. Therefore, the bulge (including behind the beading process, etc.) is feasible. Bulging rafter punch with polyurethane rubber, Shore A hardness of 7O 80. die structure shown in Figure 4 said. pull out:. Figure 4 bulging mode structure 1. on the template 2. punch 3. platen 4. the right activities, 5 pieces. polyurethane convex cross 6. Die 7. under the template 8 mandrel 9. encountered expected board lO. Left activities pieces revised process plan is: a stretch of a material under a pressure bulging plastic reinforced bottom middle side of a pressure all sides. References 1 Wang Xiaopei stamping manual. Machinery Industry Press, 1990.2 Wu Poetry Xing and so on. stamping technology. Northwestern University Press, l987.

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