Die life :-
The production potential of the die is considered in terms of number of piece parts it can produce from the time it is new until it is worn-out. It varies according to.
1. Stock material used
2.Material used for the die components
1. Stock material used
2.Material used for the die components
Side wall Finish :-
The quality of side wall finish has direct influence on the degree of the friction. The smooth finish and the layoff finish are important for the die efficiency.
Excessive wear :-
Abnormal wear can be caused by any of the following conditions:
1. Cutting clearance - Insufficient or excessive.
2. Entry - Punches enter too far into the die opening.
3. Crowing - Punches are too close to each other.
4. Punch height - Vertical punch height is too great in relation to the cross sectional area of the punch.
5. Hardness.
6. Finish.
7. Suitability of the material.
8. Secure mounting.
9. Stripping.
10. Excessive runs- producing too many pieces between sharpening.
11. Press condition.
12. Careless setup.
1. Cutting clearance - Insufficient or excessive.
2. Entry - Punches enter too far into the die opening.
3. Crowing - Punches are too close to each other.
4. Punch height - Vertical punch height is too great in relation to the cross sectional area of the punch.
5. Hardness.
6. Finish.
7. Suitability of the material.
8. Secure mounting.
9. Stripping.
10. Excessive runs- producing too many pieces between sharpening.
11. Press condition.
12. Careless setup.
Characteristic of cutting Wear :-
∙ Newly sharp cutting edges are dead sharp. The dead sharp condition begins to deteriorate as soon as the die begins to run.
∙ After a short time the initial edge breaks off to produce the working radius on the cut edges. It depends on.
1. Type of material used to manufacture.
2. Hardness of die member.
3. Physical properties of the stock material.
4. Thickness of the stock material.
∙ After a short time the initial edge breaks off to produce the working radius on the cut edges. It depends on.
1. Type of material used to manufacture.
2. Hardness of die member.
3. Physical properties of the stock material.
4. Thickness of the stock material.
Wear of Punch and Die :-
Punch wears at approximately the same rate as the die block; in some cases punch may wear twice as
fast as the die block. The wear will be greater for piercing punches than for blanking punches.Punch wears during cutting as well as during stripping. The blanking punches wear slower than the piercing punches.This is because the blanking punches are easier to stripping than piercing punches.
fast as the die block. The wear will be greater for piercing punches than for blanking punches.Punch wears during cutting as well as during stripping. The blanking punches wear slower than the piercing punches.This is because the blanking punches are easier to stripping than piercing punches.
Enragement of the Die opening due to Sharpening :-
∙ When sharpening extends below the die land, he amount of increase in the die opening size is directly proportional to the degree of the angular clearance.
∙ This increase per side can be calculated from
A= B tanμ
A=Increase per side
B=Amount removed by the grinding cutting face.
μ=Clearance angle in degree.
∙ This increase per side can be calculated from
A= B tanμ
A=Increase per side
B=Amount removed by the grinding cutting face.
μ=Clearance angle in degree.
COMMENTS