Awareness of Different Structures of Flanging Dies

Flanging molds for cylindrical parts

This die is used to turn the edges of round, simple workpieces before rolling.

The blank is positioned on positioning core 6, and when the upper die moves down, the convex die 5 presses the flange of the blank and continues to move down, completing the flanging process with the concave die 8.

Flanging die

This die is used to roll the edges of a round, simple-shaped workpiece after flanging. The flanged part is positioned in the concave die 3 and the top plate 2, and the lower end of the convex die 4 enters the blank first when the upper die moves down, preventing the workpiece from deforming when the edge is rolled. The edge is rolled at the rounded surface of the convex die 4 and concave die 3. When the upper die is raised, the top plate 2 and the top bar 6 lift the workpiece.

Double crimping die

Figure (b) shows the two ends of the rolled round workpiece. The blank is a stepped cylindrical deep drawing part, as shown in Figure 5-28 (a).

Before stamping, the blank is positioned in the cavity of the lower die 2.

When the upper die goes down, the upper die 4 presses the blank to make its two ends along the upper and lower die 4, the arc cavity of 2 rolls around to form, and the upper core 3 pushes the lower core down. The spring force in the upper part of the die is greater than that in the lower part.

Round tube turning the mold

The workpiece shown is formed by turning the pipe billet into a blank. The round pipe turning process is a comprehensive embodiment of the stamping flanging, flaring, and shrinking process, and the workpiece shown is turned outwards in the form of the stamping process; when stamping, axial pressure is applied to the die, forcing the pipe billet to deform along the circular surface of the concave die and turning upwards to complete the turning process.

The die is shown as a rounded flip tube structure, with the billet 16 placed on the lower module 17 and the tube deformed by the axial pressure exerted by the upper module 12.

After the upper die is moved downwards, the inclined wedge 14 pushes the middle inclined wedge 20 towards the center, driving the slider 4 and the booster block 6 upwards so that the pipe billet is restrained during the turning and forming process. After the upper module 12 is moved downwards, the pipe billet is turned outwards along the arc of the lower module 17 until the turning and forming are completed.

After the upward movement of the upper module, the inclined wedge 14 returns, piece 20 is reset, and slider 4 and the booster block 6 are reset by the action of the tension spring 18.

Cover the inner and outer edge flanging die

This die completes the flanging of the outer edge of the workpiece ø 118 mm and the inner hole ø 10 mm. The flanging of the outer edge is done between the convex and concave die 3 and the concave die 2, and the flanging of the inner hole is done between the convex die 6 and the lower concave die 9.

The blank is positioned with the top part block 1 and the lower die 9.

When the upper die is lowered, the pushing block 8 is pressed against the rough part first to make the positioning accuracy. After the flanging process is completed, the top bar 11, top piece block 1 and 10 in the lower die, eject the workpiece. The upper die has two ways of rigid and elastic pushing, i.e., with the help of beater bar 5, beater plate 7, top bar, and spring, the pushing piece block 8 pushes out the piece.


Flaring and flanging of hemispherical basin parts

The rough part shown is a hemispherical part with flanges for deep drawing and forming, and the flanged bottom hole with a diameter of 64 mm is partially flared to the shape and size shown in figure (b).

In the mold shown, the three-piece jaws 6 of the lower mold, which can move radially along the long groove on the flower plate 1, can move towards the center under the action of the ring wedge 5 of the upper mold. When piece 5 is moved upwards, jaws 6 move outwards and expand under the action of spring 2. Flower plate 1 can be held up by the action of spring 8 and lowered under pressure.

Before stamping, the blank is placed on the jaws 6 and positioned with a convex die 7. When the upper die goes down, press block 3 presses the blank and the jaws 6 and causes the jaws 6 and disk 1 to go down, the lower part of the blank is flared outwards at the rounded corners of the die 7, while the ring wedge 5 pushes the jaws 6 towards the center. When the pressure-plus ram reaches the lower dead center, the flower plate 1 comes into contact with the lower die plate 9, completing the flaring and flanging process and correcting the flange.

Section flaring and flattening die

The structure shown is based on the principle of the diagonal wedge structure, which allows the flaring, flanging, and flattening process to be completed in one stroke of the press. This structure is suitable for flaring and forming small-sized parts.

The blank is a simple part with a flanged bottom punch.

(1) The blank is positioned in the fixed concave die 8, and the cam handle 12 is triggered to make the movable concave die 6 moves to the right to clamp the blank.

(2) When the upper die goes down, the guide head of the flattening die 2 guides the blank, and the ring flanging dies 5 presses the upper end of the blank outwards and expands it into a flared mouth; see working principle Figure 5-33 (a).

When the upper die continues to go down, blocked by the movable concave die 6 and fixed concave die 8, the flanging die 5 is held up in the radial direction by three pieces of flanging die 5 under the cone of the flattening die 2, and the ring-shaped plane of the flattening die peal flattens the flare of the upper end of the blank, see Fig. 5-33 (b)

(3) When the upper die is returned, the three flanging dies 5 are brought together by the action of rubber and tension springs. (3) On the return stroke of the upper die, the three flanging die 5 are brought together by the rubber and tension springs.

Internal and external flanging die

This die is mounted on a hydraulic press and completes the internal and external flanging of the workpiece.

The blank is used for positioning pin 4. When the upper die is lowered, the blank is compressed, and piece 3 compresses the spring, which deforms the inner hole ø61 of the blank piece under the action of piece 2 and piece 7. When part 3 is in contact with part 1, the pressed part moves downwards, and the outer side of the workpiece is deformed by the action of part 3 and part 7, completing the final forming of the workpiece.

Countersunk hole flanging die

Figure 5-35 shows a common form of countersunk hole flanging dies structure; convex die 1 downward when the press material downward concave pre-form, to be convex die 1 downward to complete punching with punching concave die 4, to complete the 90 ° conical surface of the flanging hole forming.

Figure 5-36 shows a modified form of construction with the convex and concave die 5 in the upper die, the punching dies 1, and polyurethane rubber 2 in the lower die. The holes are punched directly from steel dies 1 and 5 on the flat material.

As the upper die travels downwards, the unloading plate 4 presses the workpiece first, and pieces 5 and 1 complete the pre-hole punching, as shown in Fig. 5-36 (b); the upper die continues to travel downwards, and die 5 and polyurethane rubber complete the flanging of the countersunk hole, as shown in Fig. 5-36 (c).

Small hole flanging dies

Fig. 5-37 shows the structure of the common small hole flanging die: Figs. (a) and (b) show the flanging after punching the bottom of the drawn part, (a) for punching the hole and (b) for flanging the hole, for continuous punching.

Fig. (c) shows a small hole flap die with a pre-hole, and d is the diameter of the pre-hole, which can be used as a positioning hole.

Fig. (d) is a small hole flap die without pre-hole


In the panel flanging die shown, the blank is placed on the convex and concave die 2 and on the unloading plate 5, which is positioned with the movable material stopper 4.

When the upper die is moved down, the convex die is 12, the concave die 6, and the convex and concave die 2 flaps the blank inside and out.

When the upper die is raised, the unloading plate 5 is reset by a spring, and the workpiece is pushed out of the convex and concave die 2. The beater bar 9 pushes the workpiece out through the push plate 10, the push rod, and the push plate 13.

The door window flap dies

This mold is used to turn the door window, which has been turned into a straight wall, into a 25mm wide flat bottom fold and a left-hand fold (see workpiece drawing).

Piece 9 convex die insert (see Fig. 5-40) is made of eight pieces and mounted on slide 7. The double dotted position in the diagram is the original.

Concave die to insert 12, 13 combination plan shown in Figure 5-41, pieces 12 by the slant wedge 11 to push the four expansion, pieces 12 slants and push pieces 13 (four pieces) along the 45 ° direction expansion, double dot scribe position in the figure for the original position.

The working process is as follows:


(1) Positioning: Bracket 8 lifts pallet 15, the convex die to insert 9 mounted on piece 15 opens outwards under the action of the reed 6, the concave die inserts 12 and 13 then shrink inwards under the action of the spring 14, and the pieces 9, 12 and 13 are in their original position. The window part of the blank is set in piece 9

(2) Pressing: The upper die moves down, and presser 2 presses the window part of the blank.

(3) Flanging: In the downward movement of the upper die, presser 1 presses pallet 15 and then continues to move downwards. Under the action of the inclined wedges 4 and 5, the convex die to insert 9 shrinks to the working position in contact with the workpiece. The diagonal wedge 11 pushes the concave die inserts 12 and 13 to expand outwards, completing the flanging action.

(4) Take out the pieces: After the upper die is raised, pieces 9, 12, and 13 return to the original position under the action of springs 6 and 14, and the workpiece is taken out.

The above is the introduction of different structure of flanging die, if you still want to know more about the mold, please contact us