ME 381 HW 7

In sheet metal parts, the minimum bending radius is dependent on which of the following elements? a. Thickness b. Type of a material c. State of material d. Thickness and type of material e. Type of process.

0.075L T 0.8 4.0 -7.0 + All dimensions in inches -2.0- 0.1 T 0.205 0.25 T 0.25 5) Rolling: A rolling operation is performed on a 5 mm thick sheet of low carbon steel (K=530, n=0.26 from Table 8.1). The sheet is reduced by 0.2 mm each pass. The friction at the dies is 0.3. The roller diameters are 50 mm. The sheet width is 125 mm. a) Find the roll force for the 3rd pass. For the 3rd pass the initial thickness is 4.6 mm and the final thickness is 4.4 mm. a) Estimate the power to perform the 3rd pass if the roll rotates at 100 rpm.

An automated blanking and forming line is designed to from 2 mm thick sheet, made from 2024 Aluminum, T4 temper, into a square sheet metal part. Elongation at 50mm 20% Young’s Modulus 70GPa Yield strength 325 MPa UTS 470 A) What is the force required to punch a square piece that is 500 mm on each edge? B) If the sheet blank was bent to a radius of 5 mm, what will be the radius after springback occurs? C) What is the required bend angle to achieve a 90° final bend angel for a bend radius of 5 mm?

A draw frame has a delivery speed of 820 m/min and a total actual draft of 8. Six slivers (each 415 denier) are fed to the draw frame. If the efficiency of the draw frame is 90 %, what is the production rate in kg/hr? Show Calculation.

Bar stock of initial diameter = 90 mm is drawn with a draft = 15 mm. The draw die has an entrance

A compound die will be used to blank and punch a large washer out of 6061ST aluminum alloy sheet stock 3.50 mm thick. The outside diameter of the washer is 50.0 mm and the inside diameter is 15.0 mm. Determine the punch and die sizes for the punching operation. TABLE 20.1 Clearance allowance value for three sheet-metal groups. Metal Group A. 1100S and 5052S aluminum alloys, all tempers 2024ST and 6061ST aluminum alloys; brass, all tempers; soft cold- 0.045 0.060 rolled steel, soft stainless steel Cold-rolled steel, half hard; stainless steel, half-hard and full-hard 0.075 Select one: a. 18.42 mm b. 20.42 mm c. 19.42 mm d. 15.42 mm

A compound die will be used to blank and punch a large washer out of 6061ST aluminum alloy sheet stock 3.50 mm thick. The outside diameter of the washer is 50.0 mm and the inside diameter is 15.0 mm. Determine (a) the punch and die sizes for the blanking operation, and (b) the punch and die sizes for the punching operation Vallue for allowance = 0.060

Please answer all parts

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In conventional drawing of a stainless steel wire, the original diameter D.-3mm, the area reduction at each die stand r-40%, and the proposed final diameter D₁-0.5mm, how many die stands are required to complete this process.