Method for preparing metal sizing agent by a compelling, equal-freezing and continuous method

Abstract

The invention relates to a method for forced uniform solidified continuous preparing metal slurry, comprising that (1) melting overheat metal with the temperature more than the liquidus temperature about 0-100deg.C is poured into upper guide flow pipe; (2) the liquid metal flows into the melting deconcentrator and the liquid metal is injected on the inner round wall of melting deconcentrator; the temperature control system out of pulping room make the wall temperature of pulping room be controlled lower than the liquidus temperature about 0-100deg.C; the liquid metal is collected at the cone bottom to obtain the metal slurry with solid fraction smaller than 30%; the metal slurry flows out through the lower guide flow pipe and the temperature is controlled in -10-10deg.C of liquidus temperature; (3) the metal slurry flows into the collector or is sent into the common equipment such as die-casting, rolling and forging so on directly to carry rheological forming out and or is cast into the mould continuously to produce semi-solid continuous casting slab. The merit of invention is that the preparation of metal slurry is uniform, mass and continuous, and it can satisfy the demand of huge industrial production easily.

Description

technical field

[0001] The invention relates to a method for continuously preparing metal slurry by forced uniform solidification, which belongs to the field of material forming and processing. Background technique

[0002] The metal slurry containing a large number of fine, uniformly suspended crystal nuclei in the liquid phase is prepared by forced means. This slurry has good fluidity. Using such a metal slurry for casting and forming, the internal structure of the casting is fine, uniform and dense. Defects such as shrinkage, porosity, segregation, and cracks are greatly reduced, which can significantly improve the mechanical properties of castings; subsequent processing of casting slabs prepared with this metal slurry can significantly reduce the occurrence of problems such as cracking, uneven structure, and segregation, and improve Yield, processability and product mechanical properties, and more importantly, the required microstructure and properties can be achieved wi...

Examples

Embodiment 1

[0029] A nozzle-type slurry continuous preparation device is used to prepare a semi-solid round billet with a cross-sectional size of 3.5. The material is A357 alloy, and the liquidus temperature is 613°C. The surface roughness of the cast billet is required to be less than 0.25, and subsequent processing does not require peeling treatment. The non-dendrite ratio in the slab is greater than 80%, and the average grain diameter is less than 100 μm, which is used for semi-solid thixotropy. During the production process, the A357 alloy was smelted in a medium-frequency induction furnace, and after degassing and refining treatment, it was left to stand for 20 minutes, and the pouring temperature was controlled at 680°C. The technical parameters adopted in the present invention are as follows: after the pulping chamber is preheated to 600° C., the lower guide pipe is closed, and protective gas (nitrogen or argon, greater than one atmospheric pressure) is sprayed into the pulping cham...

Embodiment 2

[0031] Die-casting of air compressor connecting rod, a key part of commercial trucks, was prepared by using split disc type slurry continuous preparation device. The raw material was ZL108 aluminum alloy, and the liquidus temperature was about 605°C. Due to the high mechanical performance requirements and special service conditions of the aluminum alloy air compressor connecting rod, the castings are prone to casting defects such as pores and looseness, and the pass rate is less than 80%. The technical scheme adopted by the invention is: melting the ZL108 alloy in an intermediate frequency induction furnace, after degassing and refining treatment, standing still for 20 minutes, and controlling the pouring temperature at 660°C. The technical parameters adopted are: after the pulping chamber is preheated to 600°C, close the lower guide pipe, and spray protective gas (nitrogen or argon, greater than one atmospheric pressure) into the pulping chamber. The above-mentioned smelted q...

technical field

[0001] The invention relates to a method for continuously preparing metal slurry by forced uniform solidification, which belongs to the field of material forming and processing. Background technique

[0002] The metal slurry containing a large number of fine, uniformly suspended crystal nuclei in the liquid phase is prepared by forced means. This slurry has good fluidity. Using such a metal slurry for casting and forming, the internal structure of the casting is fine, uniform and dense. Defects such as shrinkage, porosity, segregation, and cracks are greatly reduced, which can significantly improve the mechanical properties of castings; subsequent processing of casting slabs prepared with this metal slurry can significantly reduce the occurrence of problems such as cracking, uneven structure, and segregation, and improve Yield, processability and product mechanical properties, and more importantly, the required microstructure and properties can be achieved wi...

Examples

Embodiment 1

[0029] A nozzle-type slurry continuous preparation device is used to prepare a semi-solid round billet with a cross-sectional size of 3.5. The material is A357 alloy, and the liquidus temperature is 613°C. The surface roughness of the cast billet is required to be less than 0.25, and subsequent processing does not require peeling treatment. The non-dendrite ratio in the slab is greater than 80%, and the average grain diameter is less than 100 μm, which is used for semi-solid thixotropy. During the production process, the A357 alloy was smelted in a medium-frequency induction furnace, and after degassing and refining treatment, it was left to stand for 20 minutes, and the pouring temperature was controlled at 680°C. The technical parameters adopted in the present invention are as follows: after the pulping chamber is preheated to 600° C., the lower guide pipe is closed, and protective gas (nitrogen or argon, greater than one atmospheric pressure) is sprayed into the pulping cham...

Embodiment 2

[0031] Die-casting of air compressor connecting rod, a key part of commercial trucks, was prepared by using split disc type slurry continuous preparation device. The raw material was ZL108 aluminum alloy, and the liquidus temperature was about 605°C. Due to the high mechanical performance requirements and special service conditions of the aluminum alloy air compressor connecting rod, the castings are prone to casting defects such as pores and looseness, and the pass rate is less than 80%. The technical scheme adopted by the invention is: melting the ZL108 alloy in an intermediate frequency induction furnace, after degassing and refining treatment, standing still for 20 minutes, and controlling the pouring temperature at 660°C. The technical parameters adopted are: after the pulping chamber is preheated to 600°C, close the lower guide pipe, and spray protective gas (nitrogen or argon, greater than one atmospheric pressure) into the pulping chamber. The above-mentioned smelted q...

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