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Punch and Die

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Punch and Die  --- Aheadmold

2.    Punch and Die

(1)    Punch
There are three kinds of standard punches with circular form in the National Standard, as shown in Fig.1-10. Which

kind of punch should be selected is determined by the dimension d in the working portion. A type circular punch is

adopted for d = 1.1~30.2 mm, B type for d = 3.0~30.2 mm, quick-change circular punch for d = 5~29 mm. To fix the

circular punch on the punch plate, the hole-base transition fit h6 is adopted for A and B types of circular punches,

and the hole-base clearance fit h6 for the quick-change circular punch.
The length L of punch should be determined by the die structure. When using the fixed stripper and stock guide (see

Fig.1-11), the length L of punch is:
L = H1 + H2 + H3 + H
where, H1 is the thickness of the fastening plate in mm; H2 is the thickness of the stripper in mm; H3 is the

thickness of the stock guide in mm; H is the additional length mainly determined by the depth of punch entering into

the die (0.5~1 mm), the total wearing repairing amount (10~15 mm) and the safe distance between the stripper and punch

plate when the die is in the shut state (15~20 mm).
(a)    A type circular punch   (b) B type circular punch
(c)    quick-change circular punch
Fig.1-10   Standard punches    Fig.1-11   Determination the punch length

The non-standard punches and their fastening patterns are shown in Fig.1-12. When the distance between punches in the

same die is very small, a riveting structure can be used for the circular punch (Fig.1-12(a)); a jacket structure is

usually used for the small hole punching (Fig.1-12(b)); the quick-change type is used for the small punch which is

vulnerable to damage during blanking (Fig.1-12(c)); for the non-circular punch, if its size is a bit large, it can be

fastened to the die bolster directly by bolts, pins or bolts and location groove instead of the fastening plate

(Fig.1-12(d)); if the working portion of punch is non-circular, a circular step structure is used in the fastening

portion, and a stop gauge should be added (Fig.1-12(e)).
Fig.1-12   Non-standard punches and their patterns

For the small punch, it can also be fastened to the punch plate by low-melting alloy, inorganic or epoxy resin

adhesive, as shown in Fig.1-13.
Fig.1-13   Other methods to fix the punch

(2)    Die
The patterns of the die cutting edge are illustrated in Fig.1-14. Fig.1-14(a) and Fig.1-14(b) are the dies with the

straight wall cutting edge. The strength of the cutting edge is high, the dimension of its working portion keeps

unchanged after mending and its manufacture is convenient. It is suitable for stamping the workpieces with complex

shape or high tolerance demand. But the waste or the workpiece in such circumstances is prone to be accumulated inside

the hole of the cutting edge, so increasing the expanding force, the ejecting force and the wearing of hole wall. The

worn cutting edge forms the shape of inverse cone, which may induce the workpiece jumping from the opening-mouth of

the hole to the surface of the die, and cause difficulty in operation. The Fig.1-14(a) type cutting edge of die is

suitable for the non-circular workpiece, and Fig.1-14(b) type is suitable for the circular workpiece, the die which

the workpiece or waste needs to be ejected, or the compound blanking die.
Fig.1-14(c) and Fig.1-14(d) show the die with conical shape cutting edge. The workpiece or waste is easy to fall down

from the die hole. The workpiece or waste wouldn’t accumulate easily inside the hole of the cutting edge. The

friction and expanding force exerting on the hole wall are small, therefore the wearing of the die as well as the

mending amount of the die per operation are small. But the strength of cutting edge is a bit lower. The dimension of

cutting edge increases after mending, but in general its influence on the workpiece dimension and the die life is

weak. The dies with conical shape cutting edges are suitable for stamping thin workpieces with simple shape and low

tolerance demand.
Fig. 1-14   Shapes of the die cutting edge

Article come from AHEADMOLD,website is WWW.AHEADMOLD.COM.

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