When it comes to press machines, the choice of material for the dies is crucial.
Graphite and metal dies are the most commonly used materials.
Graphite is particularly popular for hot pressing equipment.
It is favored for its low cost, ease of machining, and good thermal stability over a wide temperature range.
Graphite dies offer low density, low resistance, and sufficient mechanical strength.
Their compressive strengths range from 35-45 MPa, with high-strength graphite reaching up to 70 MPa.
However, graphite dies have limitations.
They have low mechanical strength under high pressure and can react with certain materials like oxides, transition metals, nitrides, and silicides.
Metal dies, especially copper alloy dies, are also widely used.
They are particularly suitable for making polycrystalline optical materials like magnesium fluoride, magnesium oxide, and lead selenide.
Oxide and ceramic dies are less common due to their poor thermal stability, difficulty in processing, and compatibility issues with the pressed material.
Hydraulic presses are versatile and efficient machines used in various industrial processes including metalworking, plastics processing, and woodworking.
These presses utilize dies to generate compressive force using fluid power.
They can perform operations such as forging, punching, blanking, deep drawing, and forming.
The choice of die material in hydraulic presses depends on the specific requirements of the application, such as the material being processed and the conditions under which the press operates.
5 Key Materials Explained
1. Graphite Dies
Graphite is a popular choice for hot pressing equipment.
It offers low cost, ease of machining, and good thermal stability.
Graphite dies have low density, low resistance, and sufficient mechanical strength.
Their compressive strengths range from 35-45 MPa, with high-strength graphite reaching up to 70 MPa.
However, graphite dies have limitations such as low mechanical strength under high pressure and reactivity with certain materials.
2. Metal Dies
Metal dies, especially copper alloy dies, are widely used.
They are particularly suitable for making polycrystalline optical materials.
Metal dies offer good thermal stability and mechanical strength.
3. Oxide Dies
Oxide dies are less common due to their poor thermal stability.
They are difficult to process and have compatibility issues with the pressed material.
4. Ceramic Dies
Ceramic dies are also less common.
They have similar issues to oxide dies, including poor thermal stability and processing difficulties.
5. Hydraulic Presses
Hydraulic presses are versatile machines used in various industrial processes.
They utilize dies to generate compressive force using fluid power.
The choice of die material in hydraulic presses depends on the specific requirements of the application.
Continue exploring, consult our experts
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