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Casting method of movable and fixed vortex casting pieces of compressor

The invention provides a casting method of movable and fixed vortex casting pieces of a compressor, aiming at solving the technical problem that the movable and fixed vortex casting pieces generate loosing and shrinkage at the hot joint in the casting process. The casting method comprises the following steps: embedding a conformal cold iron into the hot joint of the casting piece at the corresponding position of a core box, then carrying out sand shooting and manufacturing a sand core with the conformal cold iron; and placing the sand core with the conformal cold iron into a casting mold, combining a dead head feeding technique and casting the casting piece. The shape of the conformal cold iron is manufactured into a vortex shape or an arc shape according to the shapes of a vortex sand core teeth and the position of the hot joint of the vortex casting piece. One end of the conformal cold iron is provided with a columnar positioning lag; and the core box is provided with a positioning hole matched with the positioning lag. The sand core is internally provided with the conformal cold iron which is directly applied on the hot joint, thus having fast cooling speed and leading the hot joint position to obtain maximum subcooled temperature in the vortex casting piece. The casting method can effectively solve the defects of loosing and shrinkage of the root part of the vortex teeth.
Owner:山西华翔同创铸造有限公司

One-component moisture cured polyurethane sealant containing novel water removal agent and preparation method of one-component moisture cured polyurethane sealant

The invention discloses one-component moisture cured polyurethane sealant containing a novel water removal agent. The one-component moisture cured polyurethane sealant containing the novel water removal agent is prepared from polyurethane prepolymer, a plasticizer, a water removal agent a, a water removal agent b, a filler, a silane coupling agent, a catalyst and an auxiliary agent; the inventiondiscloses the one-component moisture cured polyurethane sealant containing the novel water removal agent; the polyurethane prepolymer with low molecular weight is prepared and added into the formula of the one-component moisture cured polyurethane sealant to substitute monofunctional isocyanate p-toluenesulfonyl isocyanate serving as a high-efficiency chemical water removal agent in part of formulae, so that the requirements on types and using amounts of water removing agents in a product system are lowered; moreover, a series of serious problems caused by adding of excessive monofunctional isocyanate cannot be caused; the novel water removal agent a of the one-component moisture cured polyurethane sealant protects NCO active groups in a main body prepolymer with high molecular weight frombeing consumed, so that the final curing strength of the product reaches expected strength; better construction performance is achieved, and a bubbling phenomenon of the product is improved.
Owner:SHANDONG NORTH MODERN CHEM IND
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