Why does the mold crack?How to prevent crack?
(1) structural design leads to cracks and their prevention.
In the design of die structure, if the structural design is improper, such as the screw hole is too close to the edge, the strength is weakened;Corner is too sharp, not smooth transition, cause stress concentration and so on, makes the mold in forming the crack caused by excessive stress at work, for this kind of structural cracks, due to the mould has been made, if you want to change the structure has been impossible, can only be enhanced by adopting the method of framing.
(2) improper heat treatment leads to cracks and their prevention.
Many parts in injection mold, such as model, dynamic model, guide pin, guide sleeve, etc are necessary for heat treatment, to enhance the wear resistance and prolong the life, but, if choose improper heat treatment conditions, or improper heat treatment operation, make the parts material hardness is quite different from everywhere, in the mold is very easy to produce cracks at work, to this, you should look at heat treatment conditions, strict heat treatment operation procedures.
(3) the rigidity of die is not enough to cause crack and prevent.
Injection mold at work, to inherit the strong pressure, if the mould rigidity, under pressure from the powerful may cause crack, the key to solve the problem or the mould structure design, mold has enough stiffness and strength must be considered.
(4) the brittleness of the mould material is too large, leading to crack and its prevention.
Some material brittleness is too large, such as high carbon content of steel brittleness is big, a little heat treatment hardness is very high, this kind of material in the crack of too much stress or shock is easy, to this. Should choose toughness good material to make mold.