The meaning of common terms in mold design

Punching: Punching is the collective name of the blank after one or more stamping processes, that is, the collective name of process parts and workpieces.

Glossy:

The smooth surface is the bright section of the blanking piece being cut out.

Rebound:

There are two types of springback, one is the difference between the size of the formed punch after being taken out of the mold and the corresponding size of the mold. For curved parts, it is generally expressed in terms of angle difference or radius difference. The other is the difference between the outer dimension of the blanking piece that escapes from the mold and the corresponding dimension of the concave die or the difference between the inner dimension and the corresponding dimension of the punch.

Closed height closed:

The closing 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.

journey:

The stroke is the distance between the end points of the up and down movement of the press slide. Traditionally, the up and down movement of the press slider is also called the stroke, such as “stroke down”, “stroke up”, “strokes per minute” and so on.

Negative rebound:

Negative springback is the springback when the radius of curvature of the formed punch is reduced after being taken out of the mold, or when the material body shrinks when the blanking part escapes from the mold.

Clamping feeding device:

The clamping and feeding device is a device that uses mechanical, pneumatic or hydraulic clamping, loosening and reciprocating actions to send raw materials into the die.

life:

The life span refers to the number of times that the die can be punched per grinding or the number of times that the die can be punched before it is scrapped. The former is called sharpening life, and the latter is called total life.

Step:

The step distance is the distance that the raw material that can be used for multiple stamping is fed in each time.

gap:

The gap is the difference between the corresponding dimensions of the male and female molds that cooperate with each other or the gap between them.

Single-sided clearance:

The one-sided gap is the gap from the center to one side or the gap on one side.

Blank:

The blanks are not stamped, and most of them are only used as raw materials for one-time stamping. Blanks are sometimes called blanks or wool.

Coil material:

Coil is a raw material that can be used for multiple stamping.

Sheet:

Sheet material is a plate-shaped raw material that can be used for multiple stamping.

Strips:

Strips are strip-shaped raw materials that can be used for multiple stamping.

Pull marks:

Strain marks are the friction marks between the material surface and the working surface of the die during the forming process of the stamping part.

Drawing ratio:

The drawing ratio is the inverse of the drawing coefficient.

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 coefficient is the ratio of the diameter of the drawn part to the expanded diameter.

Lugs:

The lug is an ear-shaped protrusion on the edge of the upper mouth of the drawing piece.

Feeding:

Feeding is to feed raw materials into the mold for stamping.

Feeding device:

The feeding device is a device that feeds raw materials into the mold. Common feeding devices include roller type, clamping type, hook type, etc., please refer to related terms.

hopper:

The hopper is a bucket-shaped container with a mechanism for automatically orienting and sending out formed punches.

Bending radius:

The bending radius is the inner radius of the bend of the punch.

Expanded view:

The unfolded drawing is the graphic of the flat process parts corresponding to the forming stamping parts.

Expand Size:

The unfolded size is the size of the flat process part corresponding to the size of the forming punch.

Arching:

Arching is the name of the phenomenon of unevenness on the surface of the punching part.

Wrinkle:

Wrinkling is the name of the phenomenon of wavy wrinkles on the flange of a deep-drawn part.

Trough:

The trough is a trough-shaped channel that allows the punching parts to enter or leave the mold sequentially.

Hook feeding device:

The hook feeding device is a device that uses a reciprocating hook to extend into the hole to drive the raw material into the die.

Processing:

The sorting is to stack the punched parts (most of them are punched parts).

Processing device:

The processing device is a device that arranges and stacks the punched pieces.

Layout:

Layout is the die design process to complete the layout drawing. Sometimes the nesting diagram is also referred to as nesting for short. Refer to “Layout Drawing”. Layout drawing Layout drawing is a layout drawing describing the gradual formation process of stamping parts on the strip (tape, roll) material, the final position occupied and the relationship between adjacent stamping parts.

Sticky mold:

Sticking is the name of the phenomenon that the working surface of the die and the material of the punch are bonded.

Chipping:

Edge chipping is the name of the phenomenon that small pieces of punch or die edge peel off.

Minimum bending radius:

The minimum bending radius refers to the smallest bending radius that can be successfully bent.

See “Bending Radius”.

Take a side:

Overlap is the minimum distance between the contours of adjacent punches in the layout, or the minimum distance between the contours of the punches and the edge of the strip.

Collapse:

The angle collapse has two meanings, one refers to the phenomenon that the outer edge of the blanking part is rounded near the concave die surface or the inner edge of the convex die surface, and the other refers to the height hg of the part of the blanking part that is collapsing.

Angular surface:

The collapsed surface is the plane of the blanking piece with a collapsed edge, that is, the opposite side of the burr surface. See “burr surface”.

Tryout:

Trial mold refers to the experimental stamping after the mold assembly is completed to assess the mold performance and the quality of the punching parts.

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 completed by the periodic rotation of the roller.

Upper pole:

The upper pole is the upper end point of the up and down movement of the press slider.

Lower pole:

The lower pole is the end point of the lower end of the up and down movement of the press slider.

glitch:

Burrs are sharp protrusions on the edge of the cross-section of the punch after punching.

Burr surface:

The burr surface is the plane of the blanking part with burrs on the edge. For blanking, the burr surface is the plane contacting the punch; for punching, the burr surface is the plane contacting the die.

Matte:

The rough surface is the rough section of the blanking piece torn).

Neutral layer:

The neutral layer refers to a layer of material whose strain is zero in the bent punch.

Lugs:

The lug is an ear-shaped protrusion on the edge of the upper mouth of the drawing piece.

Neutral layer coefficient:

The neutral layer coefficient is a system used to determine the position of the neutral layer.

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.

Delivery device:

The piece-out device is a device that allows the punched (sequence) pieces to be taken out of the mold.

Positive rebound:

Positive springback is the springback with the increase of the radius of curvature of the formed punch after being taken out of the mold, or the springback with the increase of the material body after the punching part escapes from the mold.
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