Below we give the definitions of the various press operations :
(a) Blanking. Blanking is the operations of cutting a flat shape from sheet metal. The article punched out is called the ‘blank’ and is the required product of the operation. The hole and metal left behind is discarded as waste. It is usually the first step of series of operations, Fig. 2.1 (a).
Plain blacking is explained in Fig. 2.2.
(b) Punching (Piercing). It is a cutting operation by which various shaped holes are made in sheet metal. Punching is similar to blanking except that in punching, the hole is the desired product, the material punched out to form the hole being waste Fig. 2.1 (b).
(c) Notching. This is cutting operation by which metal pieces are cut from the edge of a sheet, strip or blank.
(d) Perforating. This is a process by which multiple holes which are very small and close together are cut in flat work material.
(e) Trimming. This operation consists of cutting unwanted excess material from the periphery of a previously formed component.
(f) Shaving. The edges of a blanked part are generally rough, uneven and unsquare. Accurate dimensions of the part are obtained by removing a thin strip of metal along the edges. This operation is termed as shaving.
(g) Slitting. It refers to the operation of making incomplete holes in a workpiece.
(h) Lancing. This is a cutting operation in which a hole is partially cut and then one side is bent down to form a sort of tab or louver. Since no metal is actually removed, there will be no scrap.
Below we give the definitions of the various press operations : (a) Blanking. Blanking is the operations of cutting a flat shape from sheet metal. The article punched out is called the ‘blank’ and is the required product of the operation. The hole and metal left behind is discarded as waste. It is usually the first step of series of operations, Fig. 2.1 (a). Plain blacking is explained in Fig. 2.2. (b) Punching (Piercing). It is a cutting operation by which various shaped holes are made in sheet metal. Punching is similar to blanking except that in punching, the hole is the desired product, the material punched out to form the hole being waste Fig. 2.1 (b). (c) Notching. This is cutting operation by which metal pieces are cut from the edge of a sheet, strip or blank. (d) Perforating. This is a process by which multiple holes which are very small and close together are cut in flat work material. (e) Trimming. This operation consists of cutting unwanted excess material from the periphery of a previously formed component. (f) Shaving. The edges of a blanked part are generally rough, uneven and unsquare. Accurate dimensions of the part are obtained by removing a thin strip of metal along the edges. This operation is termed as shaving. (g) Slitting. It refers to the operation of making incomplete holes in a workpiece. (h) Lancing. This is a cutting operation in which a hole is partially cut and then one side is bent down to form a sort of tab or louver. Since no metal is actually removed, there will be no scrap.
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