Semi solid rheoforming method for metal parts and device therefor

Abstract

The invention relates to a semi-solid fluidized molding method and a device for metal parts. Liquid metal with the temperature from 0 to 40 DEG C above liquid phase is guided into a pulp container, and then an ultrasonic radiation is lowered down to 1 to 30mm above the liquid surface, ultrasonic radiation is started, and the slurry is cooled at the speed ranging from 0.1 DEG C per second to 3 DEG C per second. The ultrasonic radiation can be pulse radiation or non-radiation pulse with ultrasonic frequency ranging from 12kHz to 80kHz, radiation volume power 5W / cm<3> to 100W / cm<3>, and radiation time from 15s to 1000s; the slurry is poured into molding equipment to be molded into parts after the radiation. The molded part has dense organization, fine and equally distributed grains. The device of the invention comprises a pulp container, a thermostat, an ultrasonic generation and a control unit, a sleeve, and a mold and an injection rod and a molding device. The fluidized molding method and device can be used for fluidized molding of various alloy parts made from aluminum, magnesium, tin, copper and iron etc. The method has the advantages of non-contaminated pulp, long service life of ultrasonic equipment and high part production efficiency.

Description

technical field [0001] The invention belongs to the field of semi-solid metal forming, and in particular relates to a semi-solid rheological forming method and device for metal parts. technical background [0002] The so-called semi-solid metal forming technology is that when the molten metal is cooled to a temperature between the solidus and liquidus, it is vigorously stirred or disturbed, or the thermal state of the metal is changed, or a grain refiner is added. , or carry out rapid solidification, that is, change the nucleation and growth process of the primary solid phase, and obtain a solid-liquid mixed slurry in which a certain spherical primary solid phase is evenly suspended in the liquid metal mother liquid (the solid phase component is generally 50 %, even up to 60%), use this solid-liquid mixed slurry to directly carry out forming processing; or first completely solidify this solid-liquid mixed slurry into a billet, then cut the billet according to needs, and then...

AI Technical Summary

Problems solved by technology

The disadvantages are: the material performance requirements of the screw in the equipment are high (satisfying the wear resistance and corrosion resistance at high temperature, etc.); the shear rate usually generated by single screw stirring is not high enough

The disadvantage of this method is that the vibrator inserted into the melt is easily corroded by the metal melt and pollutes the metal melt; when the melt passes through the bottom, the vibration efficiency is reduced due to the absorption of the vibration by the slurry container

Literature Micro-structure evolution of semi-solid Al-7Si-0.4Mg alloy by short time supersonic vibration (Al-7Si-0.4Mg alloy structure evolution of short-time ultrasonic vibration treatment) (Liu C, Pan Y and Aoyama S.In: Proc .of the 5th Int.Conf.on Semi-Solid Processing of Alloys and Composites, Colorado, USA, 1998: 439-447) also provides a kind of ultrasonic vibrating head to indirectly vibrate the melt by acting on the slurry container wall The method of semi-solid slurry, which has the problem of being difficult to install heat preservation devices

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