Die Life of cold stamping die and influence
Die with the life of the workpiece by punching out the number of
terms. Precision stamping parts Many factors affect the life Die. There are die
structure design, manufacture molds used in the punch and die materials, die
quality and surface hardening heat treatment, precision die manufacturing parts
and cold stamping materials selection. In addition, there are die installation,
adjustment, use and maintenance.
Die
Design on Life
(1)
Layout design of layout methods and take the boundary value a great impact on
the die life, too small to take the boundary value, often causing rapid wear
and convex mold, die bite wounds on the. Starting from material savings,Precision stamping partstake the boundary value smaller the better, but take
the edge is less than some value, the cut surface of the mold and the quality
of life adversely. There will be left behind in the blanking die Q-gap were to
produce spare parts glitch, or even damage the die edge, reduce die life.
Therefore, consider increasing the material utilization of the same time, parts
must yield, quality and life expectancy to determine the layout methods and
take the boundary.
(2)
die structure prone to stress concentration on the cracking of the die
structure, composite structure can be used or mosaic structure, and prestressed
structure to enhance the mold life.
(3)
the impact of clearance when the gap is too small, compressed extrusion of
interest, increased friction, increased wear, the wear side of aggravated
discharge and push pieces after blanking time, materials and convex, the
friction between die will cause wear and tear than the end edge on the side of
the grinding much, but also easily lead to convex, concave mold temperature is
high, the adsorption of metal debris in the side edge to form a metal tumor, so
that male and female die chipping or expansion occurs crack phenomenon.
Therefore, the gap is too small to Die Life very bad. Gap is too large will
increase the punch and the die face the edge of the concentration of stress,
resulting in a sharp increase in stress, so blade edge quickly lose angular
yield deformation. Therefore, addition of blanking force, thereby enabling
faster edge edge wear, reduce die life. But in order to reduce the male and
female die wear, extending mold life, while ensuring quality of stamping pieces
under the premise that larger space designed properly it is necessary
(4)
Die-oriented structure of the life of a reliable guide for the working parts
reduce wear, prevent male and female die bite wound is very effective. In
particular, non-small-Q gap Q gap or Die, compound die and multi-position
progressive die even more important. To improve the die life, must be based on
processes and the demand of precision, the correct choice-oriented form and
orientation accuracy, the choice should be higher than the accuracy-oriented
convex, concave mold with precision.
(5)
the impact of cold stamping materials, cold stamping materials selected should
meet the design requirements of workpieces and stamping process requirements,
or easy to mold damage and reduce mold life. Poor surface quality of cold
stamping, punching, cracking when the workpiece is also easy to scratch mold.
Bad cold stamping plastic materials, deformation is small, easy to press when
the workpiece rupture, but also easy to scratch mold. In addition, the material
thickness tolerances shall comply with national standards. Die because of a
certain thickness of material suitable for forming, bending, flanging, drawing
die of the male and female die structure gap is directly determined by the
thickness of the material. Precision stamping parts Therefore, uneven thickness, will result in waste
generation and mold damage.
