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Nut Screw Handle Runch

Nut Screw Handle Runch

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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It is required to design a fly- press, as shown in Fig. 6.17, which is capable of punching 50 mm diameter circles from a 1.5 mm Rm Ball Ball Nut Screw Handle Pillar Punch Die Fig. 6.17 Fly-press thick mild steel sheet. The ultimate shear strength of the sheet metal is 375 N/mm and it can be assumed that shearing will be complete when the punch penetrates through half the thickness of the sheet. The screw, with square threads, is made of steel 30C8 (S = 400 N/mm), while the nut is made of bronze. The factor of safety is 3. The operator is expected to sit in front of the fly-press, insert the sheet by his left hand and operate the handle by the right hand. The total working stroke consists of a one-quarter revolution, 45° in front of the press and 45° behind the press. During the return raised by 5 mm to provide clearance to insert the sheet. The forward or working stroke is completed in 1 second. The balls are made of cast iron, with a mass density of 7280 kg/m and the radius R is 500 mm. Neglecting collar friction, calculate (i) the dimensions of the screw; roke, the punch is
Transcribed Image Text:It is required to design a fly- press, as shown in Fig. 6.17, which is capable of punching 50 mm diameter circles from a 1.5 mm Rm Ball Ball Nut Screw Handle Pillar Punch Die Fig. 6.17 Fly-press thick mild steel sheet. The ultimate shear strength of the sheet metal is 375 N/mm and it can be assumed that shearing will be complete when the punch penetrates through half the thickness of the sheet. The screw, with square threads, is made of steel 30C8 (S = 400 N/mm), while the nut is made of bronze. The factor of safety is 3. The operator is expected to sit in front of the fly-press, insert the sheet by his left hand and operate the handle by the right hand. The total working stroke consists of a one-quarter revolution, 45° in front of the press and 45° behind the press. During the return raised by 5 mm to provide clearance to insert the sheet. The forward or working stroke is completed in 1 second. The balls are made of cast iron, with a mass density of 7280 kg/m and the radius R is 500 mm. Neglecting collar friction, calculate (i) the dimensions of the screw; roke, the punch is
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