Research On Raising Quantity Of XX Aviation Engine Accurate Casting

The XX engine aviation accurate castings due to enclosed slag, net, loose, sand hole, etc metallurgical defects, and the unqualified factor of composition and sizes, causing a qualified rate of some accurate castings not high, resulting in huge economy lose, and serious baffling accurate casting to normal produce and consign. ChengDu engine group company establish"exaltation qualified rate, reduce mass defect"technique tackle key problems item in 2003, and that topic was listed as one of the five greatest point offend pass items of the company in 2003. Target:1) the mass defect rate is decline by 8% to less than7. 5%, 2) the average qualified rate of the soldier article to 62% above. This text offends pass provided the successful project for lost wax casting raising aviation nickel-base heat alloy blade for representative accurate castings' qualified rate, the lost wax casting technological design and optimizing was carried on the emollient quest at the same time. Include concretly as follows:A) Combined the typical net spares 6104109 Ⅱ class direction, 3504023 I class direction sampling analysis the organize appearance and the composition appearance, studying the original material, mather alloy's refinement, makeing hull, smelt and cast craft and blade gating system, environment etc. factors to the aviations blade net metallurgical defects influence, built up the best craft project, basic removed the net defect, and raised casting qualified rate obviously. Still studied the net hereditary etc.B) Studied the 6104109 Ⅱs aviation blade the gating system combination form, row eliminate slag system, cast craft, the vacuum cast technique, the motheralloy filters the decontamination, the sprinkling filter net technique etc. Carrying on the craft experiment. Use feat craft project can reduce enclosed slag in great quantities and to pour castings to a qualified rate exaltation about 15%. Designing the 6104109 Ⅱs leads to sprinkle of the new gating system a molding tool 4B6680-0430,carrying on the technique verification.C) Carried on the analysis to the lost wax casting craft sand hole defect creation factor. Studied the craft projects that to pass to improve two ex-layer mold hulls materials and dry conditions, raise the surface layer strength of the mold hull;Pass the closing layer,reduce the mold hull to drop the sand, cut off the foreign sand path. Carry on craft experiment. Reduced the sand hole.D) Studied the ZGH4037 nickel-base heat alloy smelt craft, analyze the characteres of ZGH4037 nickel-base heat alloy non-vacuum smelt, adopt the ZGH4037 mother alloy vacuum match material craft technique to raise smelt quantity.E) Still studied the technique to use integral lost wax cauldron to lost wax and waxes recover;Adopt the silica dissolve gel connection to replace the silicate B ester connection making hull to raise casting quantity, decline low cost. Obtained the craft experience. Studied the technique to adopt the high cycle induction melting furnace (KGYSc-175/3 types, fast stove) to replace existing the medium frequency induction melting furnace (the Mm—102 type) to elevate smelting efficiency. Built up the valid craft project.This text offend pass was practiced by production, basic attain to the expect result, completed the production mission in advance, created huge economy value. So this text experiment is successful, the craft quantity measure is valid.