1)Parting(Sheet-Metal-Cutting Operations) 11.08 [Group: Manufacturing Process]
[Old]
Parting involves cutting a sheet-metal strip by a punch with two cutting edges that match the opposite sides of the blank , as shown in Figure 20.8(b). This might be required because the part outline has an irregular shape that precludes perfect nesting of the blanks on the strip. Parting is less efficient than cutoff in the sense that it results in some wasted material.
(Fundamentals of Modern Manufacturing, Mikell P. Groover Page 446)
[New][Better]
Parting is the operation of cutting the sheet metal into two pieces. There are two lower blades fixed to the machine frame. A gap is provided between the cutting edges of the lower blades. This gap depends upon the thickness of sheet metal. The gap can be adjusted. The upper blade is connected to the ram. The workpiece is placed between the upper and lower blades. The upper blade moves down and cuts the sheet rectal. Some scrap is removed in this operation.
[Old]
Cutoff is a shearing operation in which blanks are seperated from a sheet metal strip by cutting the opposite sides of the part in sequence, as shown in Figure 20.8(a). With each cut, a new part is produced. The features of a cutoff operation that distinguish it from a conventional shearing operation are the cut edges are not necessarily straight and the blanks can be nested on the strip in such a way that scrap is avoided.
(Fundamentals of Modern Manufacturing, Mikell P. Groover Page 446)
[New][Better]
Cutting off is the operation of cutting a piece from a sheet metal. The cut is made along a straight line or a curve. The lower blade is fixed to the machine frame. The upper blade is connected to the ram. It slides vertically. The workspiece is placed between the two blades. When the upper blade moves down, it cuts off the sheet metal. A slight clearance is given between the cutting edges of the blades. The clearance depends upon the thickness of the workpiece. In cutting off. there is no scrap.
[Old]
Parting involves cutting a sheet-metal strip by a punch with two cutting edges that match the opposite sides of the blank , as shown in Figure 20.8(b). This might be required because the part outline has an irregular shape that precludes perfect nesting of the blanks on the strip. Parting is less efficient than cutoff in the sense that it results in some wasted material.
(Fundamentals of Modern Manufacturing, Mikell P. Groover Page 446)
[New][Better]
Parting is the operation of cutting the sheet metal into two pieces. There are two lower blades fixed to the machine frame. A gap is provided between the cutting edges of the lower blades. This gap depends upon the thickness of sheet metal. The gap can be adjusted. The upper blade is connected to the ram. The workpiece is placed between the upper and lower blades. The upper blade moves down and cuts the sheet rectal. Some scrap is removed in this operation.
(Manufacturing Technology - I,C. Elanchezhian,B. Vijaya Ramnath,2006, p. 209)
2)Cutoff(Sheet-Metal-Cutting Operations)11.19
[Old]
Cutoff is a shearing operation in which blanks are seperated from a sheet metal strip by cutting the opposite sides of the part in sequence, as shown in Figure 20.8(a). With each cut, a new part is produced. The features of a cutoff operation that distinguish it from a conventional shearing operation are the cut edges are not necessarily straight and the blanks can be nested on the strip in such a way that scrap is avoided.
(Fundamentals of Modern Manufacturing, Mikell P. Groover Page 446)
[New][Better]
Cutting off is the operation of cutting a piece from a sheet metal. The cut is made along a straight line or a curve. The lower blade is fixed to the machine frame. The upper blade is connected to the ram. It slides vertically. The workspiece is placed between the two blades. When the upper blade moves down, it cuts off the sheet metal. A slight clearance is given between the cutting edges of the blades. The clearance depends upon the thickness of the workpiece. In cutting off. there is no scrap.
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