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What to do if the precision casting parts are deformed after being out of the furnace
What to do if the precision casting parts are deformed after being out of the furnace

Are the stainless steel precision castings that we have seen as soon as they are out of the furnace? Actually not. Normal stainless steel precision castings may appear deformed when they are just out of the furnace.

Normal deformation is due to investment deformation, shell deformation, external force during cleaning and removal of the gating system, heat treatment and other factors, which cause the deformation of the casting and cause the geometric shape and size to be unqualified. At this time, corrective methods can be used to repair. Correction is to rely on the action of external force to produce a certain amount of anti-deformation on the deformed casting, so that the casting can be restored to a qualified geometric shape and size. There is generally no uniform rule for the size of the correction, and it is usually mastered by the operator's experience. The amount of correction includes the amount of springback of the metal, that is, the amount of correction must be greater than the original deformation of the casting. However, the correction amount should not be too large to avoid cracks or even breakage of the casting.

There are two methods for correcting castings: manual and mechanical. The manual method is suitable for castings with simple structure and small production batches. When correcting, you can fix the casting in a vise or a special fixture, and then use the correcting tool to twist or hammer the casting. For castings with complex structures or large production batches, mechanical correction can be used. Mechanical correction is to use a correction die to correct on a press. The correction mold should be designed according to the conditions of the casting material, structure and the amount of deformation.

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