Stamp process implies applying outer strength on a sheet, strip, tube or profile by the means of power press or die, leading them to elastic deformity and disconnection. Thus, we acheive a work-pieces or stamp parts with necessary shapes and sizes. Stamp process includes the following components: sheet, mold and equipment. While stamping, a set of operations have to be applied. The succession of operations have to be planned in accordance with stamp part shapes, size precision, procedure essence as well as the stuff deformity laws. Stamp methods vary depending on the part shapes, sizes stuff characteristics, precision demands, production scale. Stamp process consists of two main operations: stuff disconnection and formation appropiate to the deformity features. Each of these operations ivolves various procedures.
Essential stamp process.
1. Blanking, which includes hole punching as well.
Blanking: Molds cut plates alongside closed line, the washed down part is work-piece, all the other parts can be taken as wastes. Mold core determines design sizes and a gap should be taken on punch.
Hole punch: Molds cut sheets alongside closed line, the washed down part is waste. Punch determines design sizes, a gap should be taken on mold core.
2. Cut process: this implies cutting sheets through dies along unclosed line.
3. Incision: Sheet gets partly cut on blank then cut part gets bent.
4. Trim process: This implies cutting off unnecassary portions from edges of rough products when they have been drawn and formed.
5. Sectioning: this means cutting unfinised design in two or maybe more parts for duplex stamp.
6. Curling: means rolling up plate ends.
7. Crook process implies turning one of the sheet parts into angle.
8. Deep draw: If the plate is pressed in a blank work-piece, density of walls do not get changed.
9. Thinning and stretching: This implies decreasing caliber and density of walls, enlarging the work-piece height. It is done for changing blank work-piece sizes and obtaining the necessary base density and slim wals.
10. Hole turnupping: Set plate edges with hole in ipright edges.
11. Edge roll-up: Means turning up the work-piece outside ridge into circle arch or crooked vertical ridge.
12. Necking: Reducing blank work-piece nozzle.
13. Flaring: Enlargening blank work-piece nozzle.
14. Fluctuating: Means pressing ribs, patterns, words upon plates or work-pieces and thinning through the density of undulated position.
15. Hemming: Rolling work-piece edges in particular shapes.
16. Bulging: Expanding blank work-piece one side alongside radial directing forming bulging barrel.
17. Spinning: Pressing plate material in a particular form through the bar.
18. Reshaping: Making the imprecise form of a work-piece precise.
19. Leveling: Flattending, bending the work-peice or plate rough face.
20. Pressing: Changing work-piece thickness, pressing texts or patterns upon the face.
21. Forth expulsion: Metal bar in the hollow appears in elastic deformity when exposed to the pressure of punch, then it extrudes out of the die opening causing metal to flow in punch direction.
22. Backwards expulsion: In metal expulsion plastic flowth is shaped alongside the slit in the midst of punch and die, which is counter to punch move.
23. Compound expulsion: This assumes positive and converse squeezes combination.
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