Stamping process is a process method of metal forming. At the same time, it is also called one of the four major processes of automobile manufacturing together with welding, painting and final assembly. Therefore, without stamping, the car may still be the same as the previous banging and banging. The level of making 3 cars a month Oh~ Today, let’s learn the definitions of the 72 technical concepts of stamping with you, so that you can use them in your future work.
stamping process Terminology
The workpiece is a punched piece that has completed each process specified in the process document.
2. Process parts
Process parts are blanks or punched parts that have been stamped, but need to be further stamped.
3. On the piece
The upper part is to send the process part into the mold for further stamping.
4. Top device
The upper part device is a device that feeds the process parts into the mold.
5. Top dead center
The top dead center is the upper end point of the up and down movement of the press slider.
6. Bottom dead center
The bottom dead center is the lower end point of the up and down movement of the press slider.
Burrs are sharp protrusions on the edge of the punched section after punching.
8. Burr surface
The burr surface is the plane of the blanked part with burrs on the edge. For blanking, the burr side is the plane that contacts the punch; for punching, the burr side is the plane that contacts the die.
9. Rough face
The rough surface is the rough section where the punched part is torn.
10. Neutral layer
The neutral layer refers to a layer of material that has zero strain in the bent stamping.
11. Neutral layer coefficient
The neutral layer coefficient is a system used to determine the position of the neutral layer.
12. Double-sided gap
The double-sided gap is the gap from one side to the opposite side or the sum of the gaps on both sides.
The ejection is to make the punched process (sequence) parts out of the mold.
14. Piece out device
The ejection device is a device that makes the punched (process) parts out of the mold.
15. Positive rebound
Positive springback is the springback of the increased radius of curvature after the forming punch is taken out of the die, or the springback of the material entity increasing after the punched piece escapes from the die.
Stamping is the collective term for blanks after one or more stamping processes, that is, the collective term for process parts and workpieces.
The glossy surface is the bright section of the blanked part that is cut out.
18. Closing height
The closed height is the distance between the upper plane of the upper die seat or the plane of the lower die seat when the die is at the lower pole of the working position.
There are two kinds of springback, one is the difference between the size of the formed punch after it is taken out of the mold and the corresponding size of the mold. For curved parts, it is generally expressed as an angle difference or a radius difference. The other is the difference between the outer dimension of the blanking part escaping from the die and the corresponding dimension of the die or the difference between the inner dimension and the corresponding dimension of the punch.
Stroke is the distance between the end points of the up and down movement of the press slide. It is customary to refer to the up and down movement of the press slider as the stroke, such as “stroke down”, “stroke up”, “strokes per minute” and so on.
21. Negative rebound
Negative springback is the springback in which the radius of curvature decreases after the forming punch is taken out of the die, or the springback in which the material entity shrinks after the punching part escapes from the die.
22. Clamping and feeding device
The clamping and feeding device is a device that uses the clamping, loosening and reciprocating actions of a mechanical, pneumatic or hydraulic press to feed raw materials into the die.
Life refers to the number of times the die can be punched per grinding or the number of times the die can be punched before it is scrapped. The former is called sharpening life and the latter is called total life.
24. Step distance
The step distance is the distance that each feed of raw material can be used for multiple punches.
The gap is the difference between the corresponding dimensions of the matched punch and die or the gap between them.
26. One-sided clearance
A single-sided gap is a gap from the center to one side or a gap on one side.
Blanks are unstamped and mostly used as raw material for one stamping. Blanks are sometimes called blanks or stock.
28, coil material
Coils are raw materials in rolls that can be used for multiple punches.
Sheet stock is a sheet-like raw material that can be used for multiple punching.
Strips are strips of raw material that can be punched multiple times.
31. Pull marks
Pull marks are the friction marks between the surface of the material and the working surface of the mold during the forming process of the stamping part.
32. Drawing ratio
The draw ratio is the inverse of the draw factor.
33. Drawing coefficient
The drawing coefficient is the ratio of the diameter of the cylindrical drawing part in this process to the diameter of the drawing part in the previous process. For the first drawing, the drawing factor is the ratio of the drawn part diameter to the expanded diameter.
34. Protruding ears
The lugs are the ear-shaped protrusions on the upper mouth edge of the drawing piece.
Feeding is the feeding of raw materials into a die for stamping.
36. Feeding device
The feeding device is the device that feeds the raw material into the mold. Common feeding devices include roller type, clamp type, hook type, etc.
The hopper is a bucket-shaped container with a mechanism that automatically orients the forming punches out.
38. Bending radius
The bend radius is the inner radius at the bend of the punch.
39. Expansion map
The expanded drawing is a plane process part graphic corresponding to the forming punching part.
40. Expand size
The unfolded dimension is the dimension of the flat process piece corresponding to the dimension of the formed punching piece.
Arching is the name of the phenomenon in which the surface of the punching piece is arched and uneven.
Wrinkling is the name of the phenomenon in which the flange of the deep-drawn part produces wavy wrinkles.
43. Feed trough
A trough is a trough-shaped channel that sequentially enters or leaves the die.
44. Hook feeding device
The hook feeding device is a device that uses the reciprocating hook to extend into the hole to drive the raw material into the die.
Arrangement is to stack the punched parts (mostly punched parts).
46. Parts management device
The sorting device is a device that arranges and stacks the punched pieces.
Nesting is the die design process to complete the layout drawing. Sometimes the layout diagram is also referred to as layout.
48. Layout diagram
The layout diagram is a layout diagram describing the step-by-step formation process of the punching piece on the strip (belt, roll) material, the final occupied position and the relationship between the adjacent punching pieces.
49, stick mold
Die sticking is the name of the phenomenon in which the working surface of the die is bonded to the punching material.
50. Cracked edge
Chipping is the name of the phenomenon in which small pieces of punch or die edge peel off.
51. Minimum bending radius
Minimum bend radius refers to the smallest bend radius at which a successful bend can be made.
52, take the edge
Overlap is the minimum distance between the contours of adjacent punching parts in the layout drawing, or the minimum distance between the contour of the punching part and the edge of the strip.
The slump has two meanings, one refers to the phenomenon that the outer edge of the blanking part is close to the concave die surface or the inner edge near the convex die surface is rounded, and the other refers to the height hg of the part of the blanking part that is slumped.
54, slump surface
The slump surface is the plane of the blanking part with a slump edge, that is, the opposite side of the burr surface.
55. Test mode
Die tryout refers to the experimental stamping after the die assembly is completed to evaluate die performance and punching quality.
56. Roller feeding device
The roller feeding device is a device that uses a pair of rollers to clamp the raw material and feed it into the die. The feeding of the material is accomplished by the periodic rotation of the rollers.
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Stamping Die Terminology
Blanking is a stamping process that uses a die to separate some materials or process parts from another part of materials, process (process) parts or waste. Blanking is a general term for separation processes such as cutting, blanking, punching, punching, grooving, sectioning, chisel cutting, edge trimming, tongue cutting, slitting, and refurbishment.
Slicing is a stamping process in which material is partially but not completely separated along an open contour. The material that is cut to separate is in or substantially in the same plane as it was before separation.
Trimming is a stamping process that uses a die to trim the edge of the forming process part to make it have a certain diameter, a certain height or a certain shape.
4. Cut the tongue
Tongue cutting is a stamping process in which the material is partially but not completely separated along the open contour. The partially separated material has a certain position required by the workpiece and is no longer on the plane it was in before separation. cut off
5. Cut off
Cut-off is a stamping process that separates material along an open contour, and the separated material becomes a workpiece or process piece.
Flaring is a stamping process that expands the opening of a hollow or tubular part outwards.
Punching is a stamping process that separates waste from material or process parts along a closed contour to obtain the required holes in the material or process parts.
Punching is a stamping process that separates waste material from a material or process piece along an open profile that forms a notch whose depth does not exceed its width.
Grooving is a stamping process that separates waste material from a material or process piece along an open profile that is groove-shaped and whose depth exceeds its width.
10. Punch the center hole
Punching the center hole is a punching process in which a shallow concave center hole is formed on the surface of the process part, and the material on the back has no corresponding protrusion.
11. Fine blanking
Fine blanking is a kind of smooth blanking, which uses a fine blanking die with a toothed blanking plate to make the entire section of the punched part completely or basically all smooth.
12. Continuous mode
The continuous die is a die with two or more stations, and the material is fed into one station successively with the stroke of the press, so that the punching piece is gradually formed.
13. Single process mold
A single-process die is a die that only completes one process in one stroke of the press.
14. Combination die
Combination punching die is a universal and adjustable complete set of punching die that gradually forms various punching parts according to geometric elements (straight line, angle, arc, hole). The outline of the flat stamping generally requires several sets of combined dies to be punched in stages.
Embossing is a stamping process in which a punch is extruded into one side of the process part, forcing the material to flow into the opposite pit to form a protrusion.
Embossing is a stamping process that forcibly partially extrudes materials and forms dimples, patterns, characters or symbols on the surface of the process parts. The backside of the embossed surface has no protrusions corresponding to the dimples.
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We employ documented procedures for every step in the manufacturing process from initial program launch through steady-state production in order to ensure consistent performance. We engineer our processes to produce the desired results, monitor those results, and use what we learn to regularly refine our processes as part of our commitment to continuous process and efficiency improvement.
Many of our customers have been with us for 5-8 years or more. Year after year, they experience zero late deliveries and zero returns.
More FAQ about Stamping Die Process
What is the difference between punching and stamping
The main difference between punching and stamping lies in their primary functions and the nature of the shapes they create. Punching is mainly used for creating holes and cutouts in thin materials, while stamping is employed to form complex three-dimensional shapes in both thin and thick sheet metal. Both processes are essential in metal fabrication and manufacturing industries, each serving its unique purposes depending on the desired end product.
What is stamping process in automotive?
Fine blanking vs stamping
Fine blanking is a specialized form of stamping that offers exceptional accuracy, burr-free edges, and the ability to work with thicker materials and complex shapes. It is suitable for high-precision components with stringent requirements. On the other hand, regular stamping is more versatile and cost-effective for producing a variety of components, especially those with less stringent accuracy demands and thinner materials. The choice between fine blanking and stamping depends on the specific requirements of the part and the volume of production.