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Chapter 1 Automotive Dies Terminology
Terminology related to Auto Dies
, including stamping process terminology, stamping die and stamping part terms, and other stamping processing terms. Most terms are provided with a sketch to understand. However, the white horse is not a horse. The term diagram is only a schematic example of the term, and does not include the entire content of the term. Moreover, the terminology here is only a generic term and does not include generic terms in some places.
Section 1 Automotive Stamping Process Terminology
Incision is a stamping process that places the material partially along the open profile rather than completely. The material that is cut apart and separated is located or substantially in the plane on which it was before separation.
Trimming is a stamping process that uses a die to trim the edge of a forming step to have a certain diameter, a certain height, or a certain shape.
The tongue is a stamping process that places the material along the open contour rather than completely. The partially separated material has a certain position required by the workpiece and is no longer located on the plane where it was before separation.
Cutting is a stamping process in which the material is separated along the open contour, and the separated material becomes a workpiece or a process member.
The reverse drawing is a drawing process in which the inner wall of the hollow process member is everted.
Features of reverse drawing:
1 The reverse drawing material has a flow direction opposite to that of the positive drawing, which is advantageous for mutually canceling the residual stress formed during the drawing.
2 When the drawing is reversed, the bending and reverse bending of the material are less, and the cold work hardening is less, which is favorable for molding. In the deep drawing, the material located at the rounded corner of the press ring flows into the concave corner of the die, and the inner arc becomes an outer arc. In the reverse drawing, the material located at the inner arc is always in the inner arc position in the flow.
3 Reverse drawing will invert the original outer surface, and the scratch on the original outer surface will not affect the appearance.
4 The anti-draw blank and the die contact surface are more deeply drawn and the material flow resistance is also large, so generally no need to press the material ring. However, when the outer edge of the blank flows through the entrance of the die, the resistance has been significantly reduced, so the large-diameter thin material still needs to be pressed to avoid wrinkling.
5 The deep drawing force of the deep drawing can be about 20% larger than the positive drawing force.
6 The inner diameter D1 of the reverse drawn blank is placed outside the die, and the outer diameter d2 of the workpiece passes through the inner hole of the die. Therefore, the wall thickness of the die cannot exceed 1/2 (D1-d2). That is, the reverse drawing coefficient cannot be too large, and if the thickness is too large, the wall thickness of the concave die is too thin and the strength is insufficient. In addition, the radius of the die radius cannot be greater than 1/4 (D1-d2).
Piercing Center Hole
The piercing center hole is a stamping process for forming a shallow concave center hole on the surface of the process member, and the back material has no corresponding protrusion.
Piercing is a process of separating waste material from a material or process piece along a closed contour (Figure 1-6). The desired holes are obtained on the material or process piece.
Blanking is a stamping process that uses a die to separate part of a material or process piece from another piece of material, work, or waste.
Blanking is a general term for separation processes such as cutting, blanking, punching, punching, punching, cutting, cutting, trimming, cutting, cutting, and refurbishing.
The fluting is a stamping process that separates the waste material from the material or process piece along the open profile, the open profile being grooved and having a depth that exceeds the width.
The flaring is a stamping process in which the hollow member or the tubular member is expanded outwardly.
The embossing is a stamping process in which a punch is pressed into one side of the process member to force the material into the opposite pit to form a projection.
The rib is a kind of undulating shape. When the local undulations appear in the form of ribs, the corresponding undulating forming process is called embossing.
Twisting is a stamping process in which a part of a straight or partially straight process piece is twisted at a certain angle relative to another part.
Continuous drawing is a stamping method in which a strip (rolling material) is gradually formed into a desired shape and size by multiple drawing using the same sub-die (stage-in-drawing die).
Curling is a stamping process that rolls the edge of the workpiece into a closed circle. The axis of the curled circle is linear.
The crimping edge is a stamping process in which the upper edge of the hollow member is wound into a nearly closed circle.
Drawing is a stamping process in which a straight wool or process piece is curved. The curved surface is mainly formed by a material extending at the bottom of the punch and the upper part of the bead ring.
The bending is a stamping process in which the bending deformation is realized under the joint action of the pulling force and the bending moment, and the entire bending cross section is subjected to the tensile stress.
Drawing is a stamping process in which a straight blank or process piece is turned into a hollow piece, or the hollow piece is further changed in shape and size. The drawing is mainly formed by flowing a material other than the punch into the die.
Differential temperature drawing
Differential temperature drawing is a deep drawing process that uses heating and cooling means to make the temperature of the deformed part material much higher than the temperature of the deformed part of the material, thereby increasing the degree of deformation.
The cutting is a pressing process in which the forming process member is divided into several.
Blanking is a stamping process that separates the material along a closed contour. The separated material becomes a workpiece or process piece, most of which is planar.
Fine punching is a kind of smooth punching. It uses the fine die with toothed pressure plate to make the whole section of the punching piece completely or almost completely clean.
Restriking is a stamping process that relies on the flow of material and changes the shape and size of the process piece to ensure the accuracy of the workpiece.
The hole flanging is a stamping process that turns the material around the inner hole into a side flange.
The cuff is a stamping process that turns the material around the profile curve into a side short edge.
Section 2 Automotive Stamping Die and Stamping Die Components Terminology
The lower die is the lower half of the entire die, that is, the die portion mounted on the work surface of the press.
The lower die set is a part of the lower die that is in contact with the work surface of the press, and is generally a plate. It is fixed directly on the press table or on the backing plate.
The upper die is the upper half of the entire die, that is, the die portion mounted on the slider of the press.
Upper Die Set
The upper set is the uppermost plate-shaped part of the upper die, and is pressed against the press slider during work, and is fixed by the die handle or directly to the slider.
Cutting edge inclination
The edge slope is the slope of each side of the blanking edge of the die hole.
The blade wall is the side wall of the cutting edge of the die hole.
The air cushion is a kind of topper powered by compressed air.
Reverse side clamp
The opposite side block is a part that supports a one-way force punch from the other side of the work surface.
The punch is a convex working part that directly forms a workpiece in the die, that is, a part whose outer shape is the surface of the workpiece.
The female die is a concave working part that directly forms a workpiece in the die, that is, a part that is shaped like a workpiece surface.
The piercing die is a process equipment installed on a press for producing a punch, and is composed of two upper and lower parts that cooperate with each other.
Pressing plate/Blank holder
The pressing plate/ blank holder is a part in the die for pressing the stamping material or the process piece to control the flow of the material. In the drawing die, the pressure plate is mostly called a pressure ring.
The rib is a rib-like protrusion in the drawing die or the drawing die for controlling the flow of the material, and the pressing rib may be a partial structure of the die or the pressing ring, or may be embedded in the die or the pressing ring. Separate parts.
The pilot pin is a pin-shaped part that penetrates the material hole to guide its position within the die.
The guide plate is a plate-shaped part with a precision sliding inner hole with the punch, and is guided by the inner hole to ensure mutual alignment of the punch and the die. There is also a different structure of guide plates for large and medium dies. The guide plate is a flat plate-like member for ensuring that the two of the punch, the bead ring and the die are aligned and slid.
The guide post is a cylindrical part that provides precise guidance for the relative movement of the upper and lower mold bases, and is mostly fixed to the lower mold base for use with the guide sleeve fixed to the upper die set.
Guide column formwork
The guide column mold frame is a mold frame in which the guide post and the guide sleeve slide relative to each other.
The guide plate is a plate-shaped guide member for guiding the strip (belt, roll) into the die.
The guide sleeve is a cylindrical part that provides precise guidance for the relative movement of the upper and lower mold bases, and is mostly fixed to the upper mold base for use with the guide post fixed to the lower die set.
The shield is a plate-like part that prevents fingers or foreign objects from entering the danger zone of the die.
The progressive die is a die with two or more stations, and the material is fed into the station one by one with the press stroke, so that the punch is gradually formed. The continuous mode is also known as the progressive die.
Locating pin (plate)
The positioning pin (plate) is a part that ensures that the process piece has a constant position in the die, and the shape is different, and is called a positioning pin or a positioning plate.
There are two types of scrap cutters.
1. It is installed on the flange trimming die of the deep drawing part to cut the whole circle of waste to facilitate the smooth removal of waste.
2. A cutter that is placed on a press or mold to cut the strip (roll, roll) waste according to a fixed length for removal.
The single die is a die that completes only one process in one stroke of the press.
The ram is a member of the rod that directly or indirectly ejects the process piece or scrap from the upward movement.
The ejector pin is a pin-shaped part that lifts the material away from the die face to facilitate feeding. Some top pins have both guiding functions, and some are only used for topping.
The fixing plate is a plate-shaped member for fixing the punch.
The stripper plate is a fixed or movable plate-shaped part that detaches the material or the workpiece from the punch.The stripper plate is sometimes integrated with the guide plate and serves as a guide material, and is still called a stripper plate.
The discharge screw is a screw fixed to the elastic discharge plate for limiting the rest position of the elastic discharge plate.
Limit post (block)
The limit post (block) is a cylindrical (block) part that limits the distance from the plane on the upper die holder to the lower plane of the lower die holder after clamping.
The backing plate is a hardened plate-like part between the fixed plate (or the die) and the die holder to reduce the unit compressive stress that the die holder is subjected to.
The compound die is a die that performs two or more processes at the same station in one stroke of the press.
The floating die shank is assembled with the upper mold base simultaneously up and down, but the angle formed by the central axis and the plane of the upper mold seat can be freely movable within a certain range.
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The push rod is a rod-shaped part that directly or indirectly pushes a workpiece or scrap material.
A Cam is a wedge-shaped part of a mold that changes the direction of linear motion. Most wedges make vertical motion horizontal.
The leakage hole is directly penetrated from the punching die hole for removing the waste or the hole of the workpiece.
The mold base is a combination of the upper and lower mold bases and the guide post and the guide sleeve, and may or may not have a mold handle. Most formwork is standard.
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Section 3 Stamping process terminology
Bottom dead point
The bottom dead center is the lower end of the upper and lower movements of the press slider.
Top dead center
The top dead center is the upper end of the upper and lower movements of the press slider.
The workpiece is the punch of each process specified in the completed process documentation.
The process part is a blank or punch that has been stamped, but further stamping is required.
The burr is a sharp bulge at the edge of the punched section of the punched piece.
The gap of the double-sided gap from one side to the other side or the sum of the gaps on both sides.
The output is to make the punched work piece out of the die.
Part off device
The ejection device is a device that allows the punched workpiece to be ejected from the die.
Die closing height
The closing height is the distance from the upper plane of the upper die holder to the lower plane of the lower die holder when the die is at the pole of the working position.
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 as an angular difference or a difference in radius.
The stroke is the distance between the ends of the upper and lower movements of the press slider.
The gap is the difference in the corresponding size of the female mold of the mutually fitting punch or the gap therebetween.
The pitch is the distance each time a raw material that can be used for multiple stamping is fed.
One-sided gap is a gap from the center to one side or a gap on one side
The lug is an ear-shaped protrusion that draws the edge of the upper edge of the piece.
Wrinkling is the name of the phenomenon that the flange of the deep drawing member produces wavy wrinkles.
Layout is the die design process for completing the layout drawing. The layout map is sometimes referred to as a layout.
The layout drawing is a layout diagram describing the process in which the punching piece is gradually formed on the strip (belt, roll), and the position of the final possession and the relationship between adjacent punching pieces.
The edge is the minimum distance between the contours of adjacent punches in the layout, or the minimum distance between the contour of the punch and the edge of the strip.
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The sag angle has two meanings. One refers to the phenomenon that the outer edge of the blanking member is near the concave surface or the inner edge is rounded, and the other is the height hR of the slanting portion of the blank.
The sag angle is the plane of the blanking part whose edge is at the angle of collapse, that is, the opposite side of the burr surface.
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