Maintenance method of stamping die
(1) Die looseness: The moving amount of punch or die exceeds the unilateral gap. Adjust the combination gap.
(2) Die tilt: The straightness of the punch or die is not correct, or there is a foreign object between the templates, which makes the template unable to be flat. Regroup or grind to correct.
(3) Deformation of the template: The template has insufficient hardness or thickness, or is deformed by external force. Replace the new template or correct the ungrouping method.
(4) Mold base deformation: The thickness of the mold base is insufficient or the force is uneven, and the straightness of the guide post and guide sleeve varies. Grind straighten or refill plastic steel or replace the mold base or equalize the force.
(5) Die interference: whether the die size and position are correct, whether there is deviation in the positioning of the upper and lower dies, whether they will become loose after assembly, the accuracy of the punch is incorrect, and the die is not correct.
(6) Punching and shear deflection: the punch strength is not enough, the punches are too close, the lateral force is unbalanced, and the punching is half-sloping. Strengthen the guiding and protection function of the sloping plate or increase the punch, shorten the small punch, increase the support and guidance of the heel and long, and pay attention to the feeding length.
Mold damage
(1) Buried at the hot place: the quenching temperature is too high or insufficient, the tempering times and temperature time are not appropriate, and the time of the quenching method is not sure; the problem only appears after a period of use.
(2) Stamping and stacking: The blanks continue to be punched, usually the stripping board is broken.
(3) Blockage of waste material: the blanking hole is not drilled or the size is not consistent or the bed is not cleaned in time, and the punch and the lower template are more damaged.
(4) Drop of punch: it is fully fixed or suspended at the end, or the screw is too thin, the strength is not good, or the punch is broken.
(5) Escape hole is not enough: The size or depth of the escape hole of the punch pressure plate is not enough, and the escape part of the punch and the stripper plate is usually damaged by the stripper plate.
(6) Foreign matter entry: The product blows out and springs back, the die parts are broken and dropped, and the screws protrude from the die surface or other items enter the die, which may damage the lower die, stripper plate or punch, and guide post.
(7) Assembly error: the position and orientation of parts are incorrectly installed and damaged.
(8) Spring factor: Insufficient spring force or rupture or unequal height sets cause the stripping plate to tilt, or the spring is not prepared frequently, causing overlapping punches to damage parts.
(9) Improper punching: the working height is adjusted too low, the guide column loses oil, the material strip is fed or punched half of the material, the peripheral equipment such as the feeding, putting, and receiving machine is damaged, the air pipe is not installed or opened, and the punch is abnormal. Damage caused.
(10) Improper maintenance: the replacement has not been performed or the screws have not been tightened or have not been restored as before, causing the above points to occur.
Size variation
(1) Blade wear: the hair is too large or the size becomes larger (cut shape); becomes smaller (punching); the flatness is not good. Regrind or replace the die.
(2) No guidance: The guide pin or other positioning device has no effect, the feeder does not relax or the guide pin diameter is not good, and the guidance cannot be corrected. The positioning block is worn and the feed distance is too long.
(3) The die is too short: the camber becomes large, the chamfer is insufficient, and the forming is incomplete.
(4) Not enough escape holes: being squeezed or injured or deformed. Clear or increase the depth and depth of escape holes.
(5) Insufficient ejection: feeding is not smooth, the bar is bent, the discharging is not good, the upper die pulls the material, and the ejection is extended.
(6) Improper ejection: improper preparation of ejector pin, improper spring force or excessive ejection. Adjust the elastic force or change the position or the number of pins;
(7) Poor material guide: the length of the material guide plate is too low or the material guide gap is too large, or the die and the unloader are skewed or the distance between the die and the feeder is too long.
(8) Blanking deformation: some bending parts can not allow the material to overlap, it must be dropped every time, or the dish strain can be overcome by pressure pads or shears.
(9) Bending deformation: the material is squeezed at the upper bend; the proximal hole is deformed by tensile force, the force is uneven, and the inclined punch is not long enough.
(10) Punching and shearing deformation: the material is distorted and uneven, the size increases or the eccentricity is asymmetric.
(11) Impact deformation: The product blows out too strong air pressure or gravity drops and deforms.
(12) Floating chip extrusion: The waste material floats or the fine chips remain on the die surface or foreign matter and other extrusion variations.
(13) Improper material: material width or plate thickness, improper material or material hardness can also cause defects.
(14) Poor design: poor engineering arrangement, poor gap setting, and difficult to overcome unless the design is changed.
