Casting method of turbine housing

Abstract

The invention provides a casting method of a turbine housing. The casting method includes the following steps of firstly, core manufacturing, secondly, core assembly, thirdly, shell core baking, fourthly, smelting and refining, fifthly, mold preparation, sixthly, casting and seventhly cutting and cleaning. In the core manufacturing process, a riser sand core mold is arranged on a core shooting machine, the core shooting machine is powered on to heat the mold, a layer of precoated sand is cured on a cavity of the riser sand core mold, and a riser sand core is obtained after mold opening. In the core assembly process, the riser sand core and a turbine housing core are assembled and bonded. In the shell core baking process, shell cores painted with coatings are put into a baking kiln. In the smelting and refining process, raw materials are added to a melting and heat preservation furnace, and the melting and heat preservation furnace is powered on for melting. In the casting process, the shell cores are put in a mold, and tilt casting is conducted after mold combination. In the cutting and cleaning process, a casting is cut, the riser is cast, and burrs and fins of the casting are ground and cleaned. The metal tilt casting method of an aluminum alloy turbine housing body can solves the problems of shrinkage porosities and cavities and slag holes in a big flange face of the aluminum alloy turbine housing; open risers and blind risers are arranged, in combination with the riser sand core, an ideal temperature field is formed after the casting is cast, and solidification can be conducted from the casting to the risers in sequence.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a casting method of a volute. Background technique [0002] The volute is an important part in the turbocharging system of the engine. The material is ZL101. This part has a unique shape, a complex structure, and a large change in wall thickness and section. Porosity, shrinkage and other defects (X-ray inspection). [0003] At present, the vast majority of volutes adopt sand mold gravity casting or metal mold gravity casting. Although these two casting methods have their own advantages, there are still many shortcomings. First of all, due to the complex structure of the volute, there are many reinforcing ribs around the shape, and the parting is extremely difficult, so sand casting and bottom injection gating system are generally used. In order to ensure the positioning of the volute shell core of the volute casting, the volute casting method is adopted The flange is placed fac...

AI Technical Summary

Problems solved by technology

First of all, due to the complex structure of the volute, there are many reinforcing ribs around the shape, and the parting is extremely difficult, so sand casting and bottom injection gating system are generally used. In order to ensure the positioning of the volute shell core of the volute casting, the volute casting method is adopted The flange is placed face down. During the production process, it is found that the large flange of the casting is prone to defects such as shrinkage and slag holes, which seriously restricts the production progress and increases the production cost.

Secondly, the gravity of the metal mold also adopts the bottom injection pouring system. When designing the gravity casting mold of the metal mold, in order to position the volute shell core of the volute casting, the large flange of the volute must face downward, because the cooling speed of the metal mold is fast , so that the surface of the large flange cannot be fed, and it is easy to produce shrinkage and shrinkage defects; at the same time, the large surface of the volute casting is facing downward, which is not conducive to the floating of oxidized slag during pouring, and it is easy to produce slag hole defects on the surface of the large flange. The production rate is also low, seriously affecting the production scheduling plan, and the production waste is serious

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