How to improve the quality of precision casting

H2. Method 1: process planning: strictly control the process, before the tanks, to ensure that the appearance and the sand core is with temperature condition, to ensure when pouring molten steel liquid, on appearance coarse broken place choose luck gentleman family ISOMOL300 alcohol-based zircon powder coating to brush after ignition baking, make mould appearance lubrication.

H3. Method 2: mold planning: the top stainless steel castings appearance treatment from the mold, the mold of the handle clean appearance, namely appearance using sandpaper nitro paint after rub-up, choose metal or plastic mould for high precision castings, progressive die appearance of finish.

H4. Method 3: rounded planning: to avoid occur when stainless steel forging white, in addition to the adopted measures from the technology, it is necessary to make its wall thickness too thin, when more than 15 mm wall thickness, type with metal forging casting corner is necessary to choose the rounded;

H5. Method 4: wall thickness planning: because the metal mold heat faster, so the minimum wall thickness stainless steel forging should be larger than sand mould forging of castings, all kinds of forging forged alloy, different basis on the minimum wall thickness.

H6. Method 5: sanding planning: the polishing process removes the burr of the flying side, the surface is not smooth, the polishing process, the lubrication is excessive. As for the finished casting, the grit size of the steel shot is 0. 85-1. 4mm, hardness hrc40-50, maximum hardness error plus or minus HRC3. 0.

H7. Method 6: material planning: raw materials, appearance and core making use of zirconium sand resin sand, mesh from 75 to 150, selects the thermosetting resin, mixed grinding move high refractoriness, good appearance and smooth, breakup sex good, simple shakeout.

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