How to select the die for automatic terminal machine
If we want to select the die for the fully automatic terminal machine, we need to select the die material which can meet the working conditions first.
1. High temperature performance
When the working temperature of the die is high, the hardness and strength will decrease, resulting in wear or plastic deformation of the die and failure. Therefore, the die material should have high temperature resistance to ensure that the die has high hardness and strength at high temperature.
2. Cold and thermal fatigue resistance
Some dies are heated and cooled repeatedly during operation, which causes surface cracking and flaking, increases friction, hinders plastic deformation and reduces dimensional accuracy, resulting in die failure. Thermal and cold fatigue is one of the main failure modes of hot-working dies, which should have high resistance to thermal and cold fatigue.
3. Corrosion resistance
Some molds, such as plastic molds, when working, decompose and precipitate strong corrosive gases such as HCI and HF after being heated due to the presence of chlorine and fluorine in the plastic, which erode the surface of the mold cavity, increase its surface roughness and aggravate wear failure.
4. Wear resistance
When the blank is plastic denatured in the die cavity of the automatic terminal machine, it flows and slides along the surface of the cavity, causing severe friction between the surface of the cavity and the blank, which leads to the failure of the die due to wear. So the wear resistance of the material is one of the basic and important properties of the die.
5. Strength and toughness
The working conditions of the dies are mostly very harsh, and some of them are often subjected to large impact loads, which leads to brittle fracture. In order to prevent the die parts from breaking suddenly during working, the die must have high strength and toughness.
6. Fatigue fracture properties
During the working process of the die, fatigue fracture is often caused by long-term cyclic stress. Its forms are small energy multiple impact fatigue fracture, tensile fatigue fracture contact fatigue fracture and bending fatigue fracture.