Use the advantages of resin sand casting machine bed castings

Use the advantages of resin sand casting machine bed castings

1, the resin sand stiffness is good, the initial casting sand strength is high, which has the conditions to use the graphitization expansion of cast iron solidification process, well eliminate shrinkage holes, shrinkage defects, to achieve less riser casting, no riser casting of gray cast iron and ductile cast iron.

2, solid machine casting production using polystyrene foam pattern application of Furosol resin self-hardening sand modeling. When the metal liquid is poured into the mold, the foam mold is quickly vaporized under the action of the high temperature metal liquid, and the metal liquid replaces the position occupied by the original foam, and the cooling solidifies into a solid casting with the same shape as the mold.

3, Relatively speaking, the lost mold casting for the production of single or small batch of automotive covering parts, machine tool bed and other large molds than the traditional sand mold has great benefits, it not only saves the expensive wood type cost, but also easy to operate, shorten the production cycle, increase the production efficiency, with high dimensional accuracy, small processing allowance, good surface quality and other advantages.

quench

The commonly used cooling medium for quenching is salt water, water and oil. Brine quenching workpiece, easy to get high hardness and smooth surface, not easy to produce hardening soft point, but it is easy to make the workpiece serious deformation, and even crack. Oil as a quenching medium is only suitable for quenching of some alloy steels or small-size carbon steel workpieces with relatively large stability of supercooled austenite.

temper

The purpose of tempering has the following aspects:

1, small brittleness, remove or reduce the internal stress, there is a lot of internal stress and brittleness after quenching of steel, such as not timely tempering often cause deformation and even cracking of steel.

2, to obtain the required mechanical properties of the workpiece, the casting workpiece after quenching hardness and brittleness, in order to meet the different performance requirements of each workpiece, can adjust the hardness through the appropriate tempering coordination, reduce brittleness, get the required toughness, plasticity.

3, stable workpiece size

4, for some alloy steel that is difficult to soften annealing, high temperature tempering is often used after quenching (or normalizing), so that the carbides in the steel are properly gathered, and the hardness is reduced to facilitate cutting.