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What Are the Manufacturing Methods and Precautions of Casting Moulds?


Casting mold manufacturing method

1. Ordinary sand casting

The raw materials used in sand casting are generally casting sand and molding sand binder. Silica sand is commonly used as casting sand. If the performance of silica sand can not bear the high temperature of mold casting, special sand such as chromite sand and corundum sand can be selected. This casting mold manufacturing method has a wide adaptability, and is suitable for large and medium-sized casting production.

2. Investment casting

Investment casting is a manufacturing method of using fusible materials to make patterns, and coating several layers of refractory materials on the surface of the patterns to make a mold shell, and melting the patterns out of the mold shell to get a mold without parting surface, and then firing and sand filling and pouring at high temperature.

3. Die-casting

The manufacturing principle of die casting is to press the metal solution into the cavity of the metal mold under high pressure, and the metal solution will cool and solidify under the pressure to form the casting.

2、 Precautions for making casting mould

1. The casting mould shall be made of materials with good wear resistance and high heat treatment hardness.

2. When cutting, pay attention not to use cutting fluid in dry state to avoid sharp hardening of workpiece, which makes subsequent cutting difficult.

3. If it is difficult to cut the hard shell layer on the surface, you can cut the surface of the workpiece into a slope with a bias cutter with an angle of 45 degrees, and then increase the back cut to cut the soft part to cut the hard shell layer.

4. The machining of the casting die should be carried out in a good annealing state, and the hardness requirement is generally 39-46HRC.

5. During the cutting process of the casting mould, the cutting speed does not need to be too fast, the feed rate does not need to be too large, and the back feed should be larger, otherwise the friction between the blade and the workpiece will increase, and the wear of the blade will increase.

6. The guide of the mold should be stable. In order to reduce the vibration of the mold and improve the rigidity and stability of the mold, it is necessary to increase the thickness of the upper and lower plates of the mold.

7. In order to avoid burning the workpiece when making the casting mould, the grinding wheel with relatively coarse grain size can be used at the joint surface of the concave mould and the mould sleeve.

8. When designing the casting mould, it is necessary to design the proper inner diameter of the mould sleeve according to the assembly temperature of the mould and the size of the pre-stress.