Metalworking sheet (sheet) consisting of cutting and forming operations, performed on relatively thin metal sheet between 1/14 in (0.4 mm) and 1/4 in (1mm). When the thickness of the material is more than 1/4 in called plates.
Industries that use sheets as a raw material:
- Automobile and truck,
- airplane,
- Office furniture,
- Computers,
- office equipment,
- and others.
Characteristics of part / sheet metal products needed:
- High strength,
- Good dimensions,
- Good surface finish,
- Low cost.
The three main categories of sheet metal working:
- Cutting,
- Bending,
- Withdrawal (drawing).
Utensils commonly used in sheet metal working:
- Pons (punch), and
- Mold (die).
General surgery done by machines, sheet metal clamp (press), in cold temperatures.
CUTTING OPERATIONS
1. The process of cutting
At each cutting the workpiece, will always appear to have a common principle which will look together. In workmanship cutting wire, steel bars, steel profiles or sheet metal, there must be a force that is used to cut it. And that style will work together, in the opposite direction with a relatively small distance, then the force we call the shear force, and on the material to be cut will occur an area which we call the "shift area".
In the thick material scraped Obvious areas and wide, otherwise the thin material scraped area is also thin. While drawing the third, we found the cutting edges is a closed building line. So too is the profile area of friction is closed. For that such circumstances are often called the "die shearing of sheet metal". And is often used dalan punching tool.
Stages cuts:
(1) metal sheet is placed between the punch and die;
(2) Punch pressed to workpiece (sheet), so that the surface of the sheet of plastic deformation (permanent);
(3) Punch kept pressed down, the surface of experienced penetration (tread press); Penetration area is generally about 1/3 thick slabs;
(4) After the punch movement resumed, the two sides sharp punch and die will result in cracks in workpiece;
When the distance of space (clearance) between the punch and die correctly, then the two fault lines meet each other to produce a good cut.
Characteristics of clipping the edge of the sheet as shown in Figure above, is divided into:
- Rollover, the upper parts of the cut surfaces bendakerja which is an area of the onset of plastic deformation;
- Burnish, areas located below the rollover, is the result of penetration of the punch to workpiece before cracks began; This area has a smooth cut surface;
- Fracture zone, areas which have cracks resulting downward movement of the punch; This area has a relatively rough cut surfaces;
- Burr, sharp corners on the cutting edge of the workpiece due to the strained during the separation of the workpiece.
DEFORMATION PROCESSES IN SHEET METAL PROCESSING
Industries that use sheets as a raw material:
- Automobile and truck,
- airplane,
- Office furniture,
- Computers,
- office equipment,
- and others.
Characteristics of part / sheet metal products needed:
- High strength,
- Good dimensions,
- Good surface finish,
- Low cost.
The three main categories of sheet metal working:
- Cutting,
- Bending,
- Withdrawal (drawing).
Utensils commonly used in sheet metal working:
- Pons (punch), and
- Mold (die).
General surgery done by machines, sheet metal clamp (press), in cold temperatures.
CUTTING OPERATIONS
1. The process of cutting
At each cutting the workpiece, will always appear to have a common principle which will look together. In workmanship cutting wire, steel bars, steel profiles or sheet metal, there must be a force that is used to cut it. And that style will work together, in the opposite direction with a relatively small distance, then the force we call the shear force, and on the material to be cut will occur an area which we call the "shift area".
In the thick material scraped Obvious areas and wide, otherwise the thin material scraped area is also thin. While drawing the third, we found the cutting edges is a closed building line. So too is the profile area of friction is closed. For that such circumstances are often called the "die shearing of sheet metal". And is often used dalan punching tool.
Stages cuts:
(1) metal sheet is placed between the punch and die;
(2) Punch pressed to workpiece (sheet), so that the surface of the sheet of plastic deformation (permanent);
(3) Punch kept pressed down, the surface of experienced penetration (tread press); Penetration area is generally about 1/3 thick slabs;
(4) After the punch movement resumed, the two sides sharp punch and die will result in cracks in workpiece;
When the distance of space (clearance) between the punch and die correctly, then the two fault lines meet each other to produce a good cut.
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| Shearing of sheet metal between two cutting edge |
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| Characteristics of clipping the edge of the sheet workpiece |
- Rollover, the upper parts of the cut surfaces bendakerja which is an area of the onset of plastic deformation;
- Burnish, areas located below the rollover, is the result of penetration of the punch to workpiece before cracks began; This area has a smooth cut surface;
- Fracture zone, areas which have cracks resulting downward movement of the punch; This area has a relatively rough cut surfaces;
- Burr, sharp corners on the cutting edge of the workpiece due to the strained during the separation of the workpiece.
DEFORMATION PROCESSES IN SHEET METAL PROCESSING
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