One of the most important parts of melamine tableware machine is the casting, including the upper bolster, the middle plate, the base, the cylinder and the piston.

After spraying paint, the casting of the machine is covered by the fresh color. This also makes it impossible for customers to judge the quality of the machine by looking at the appearance of the machine when purchasing the melamine tableware pressing machine. Moreover, we get to know the castings ‘quality after long-time use.

The casting material can be cast iron or nodular cast iron.

• Factories that pay attention to brand quality will choose nodular cast iron. Although the cost is high, the machine has a long service life and high value;
• Factories that focus on controlling machine manufacturing costs will prefer low-end nodular cast iron or cast iron. If you want a lower price, this kind of machine is often superior, but the service life of the machine is very short.

In order to give you a deep understanding of the structure of machine castings, the following is a detailed analysis of the differences in cast iron, nodular cast iron and cast steel.

1. Strength

• Compared with cast iron, nodular cast iron has an absolute advantage in strength. The tensile strength of nodular cast iron is 60k, while the tensile strength of cast iron is only 31k. The strength of nodular cast iron is far superior to that of cast iron.
• Nodular cast iron has higher yield strength, with a minimum yield strength of 40k. While the yield strength of cast steel is only 36k. The corrosion resistance and oxidation resistance of nodular cast iron exceed those of cast steel.
• Due to the nodular graphite microstructure of nodular cast iron, nodular cast iron is better than cast steel in reducing vibration ability, so it is more conducive to reducing stress.

2. Physical properties

• The carbon content of cast steel is less than 0.3%, while the carbon content of cast iron and nodular cast iron is at least 3%.
• The low carbon content in cast steel prevents the carbon existing as free graphite from forming structural flakes. The natural form of carbon in cast iron is in the form of free graphite flakes.
• In nodular cast iron, these graphite flakes are transformed into tiny spheres through a special treatment method, which makes the nodular cast iron have better ductility and impact resistance, while the form of flakes inside the cast iron causes the cast iron to have no ductility.

Therefore, after the pressure-loading parts of nodular cast iron are processed by the ferritizing annealing cycle, the spherical structure inside the nodular cast iron can also eliminate the cracking phenomenon that the flake graphite inside the cast iron is easy to produce. In the microphotograph of nodular cast iron, the cracks can be seen to terminate after reaching the graphite ball. In the nodular cast iron industry, these graphite balls are called "crack stoppers" because of their ability to prevent fractures.

There are various grades of nodular cast iron. The higher the grade is, the higher the manufacturing cost and the longer the service life of the machine is.

Shunhao melamine tableware molding machine adopts the top model 50 nodular cast iron, which increases the service life of the machine and saves cost on extra fee or future maintenance for the melamine tableware factories.

After learning the knowledge of castings, we will have a deeper understanding of the castings of melamine tableware machinery.

We believe that every businessman is very smart. Do you want to use a tableware machine in the short term, or do you plan to invest in the melamine tableware manufacturing industry for a long time?

Your decision will affect the development path of your factory. The melamine tableware molding machine produced by Shunhao Factory will provide long-term service for your melamine tableware manufacturing!