Semi-solid rheological molding device for metal part

Abstract

The invention relates to a semi-solid rheological molding device for a metal part. The semi-solid rheological molding device is characterized by consisting of a pouring system, a fusant cooling system, a cooling plate adjusting mechanism, a size insulation system, a structure supporting and sealing system, a multichannel temperature monitoring system, an inert gas protection system and a die-casting system. The semi-solid rheological molding device solves the problem that size is difficult to store and transport in the semi-solid rheological molding process, and realizes the integration of semi-solid rheological pulping and molding; the device has a simple and compact structure, saves the space and does not need to make any improvement on the prior die-casting equipment; and a pulping process is simple, has a short flow, is convenient to monitor, can effectively protect gas, prevent oxidation, improve the quality of a fusant, and reduce factors influencing heat exchange of the system, is favorable for controlling the thermal balance of the system and improving the precision and the stability of temperature control, reduces thermal loss, is favorable for energy conservation and consumption reduction, and is in particular suitable for small-and-medium-sized enterprises. The semi-solid rheological molding device has wide application prospect including semi-solid blanking and rheological die-casting of aluminum alloy, magnesium alloy and tin alloy.

Description

technical field [0001] The invention belongs to the technical field of metal processing, in particular to a device for semi-solid rheological deformation of metal parts. Background technique [0002] Semi-solid metal processing has become one of the most promising near-net-shape technologies due to its high-quality, high-efficiency, and near-net-shape characteristics. Semi-solid forming methods include rheoforming and thixoforming. Currently, thixoforming technology is more successful. However, compared with rheoforming, thixoforming has the following obvious defects: 1) The thixoforming process is long, so the production cost is high, the energy consumption is high, and the efficiency is low; 2) The secondary heating has high requirements on equipment; and the surface oxidation of the blank is serious; 3) The solid phase components in the blank after the secondary heating should not 4) The thixotropic process not only requires strict control of the semi-solid pulping proce...

AI Technical Summary

Problems solved by technology

Semi-solid forming methods include rheoforming and thixoforming. Currently, thixoforming technology is more successful. However, compared with rheoforming, thixoforming has the following obvious defects: 1) The thixoforming process is long, so the production cost is high, the energy consumption is high, and the efficiency is low; 2) The secondary heating has high requirements on equipment; and the surface oxidation of the blank is serious; 3) The solid phase components in the blank after the secondary heating should not 4) The thixotropic process not only requires strict control of the semi-solid pulping process to ensure good quality of the billet, but also strictly controls the process parameters in the secondary heating process to obtain solid Semi-solid structure with stable phase fraction and good structure morphology, which increases the uncertain factors in the forming process and increases the control cost

These inventions can be divided into the following categories: 1) mechanical agitation pulping rheological forming technology, including the earliest mechanical agitation pulping method and the recently invented single-helix and double-helix rheological injection casting technology, but in actual production Among them, only the earliest mechanical stirring device has been applied to a certain extent, and rheological injection casting technology is still in the equipment development stage due to poor screw working conditions, high consumption, and short life.

2) Electromagnetic stirring pulping rheological deformation technology. The biggest feature of this type of device is that it uses electromagnetic force instead of mechanical force as the driving force for stirring. There is no direct contact between the stirring rod and the molten metal, so the pollution to the alloy is reduced, but there is Disadvantages such as complicated equipment and small shearing force

3) Near liquidus pouring rheological forming process. This method is a new rheological forming technology developed in recent years. Its process route is low superheat pouring. Under the action of convection and chilling, it promotes alloy melting. body nucleation, and strictly control the temperature to increase the survival rate of crystal nuclei, and then rapidly cool the alloy liquid to the two-phase region to obtain a large number of free crystal grains. This type of method is simple in process and low in cost, but the temperature control is limited The accuracy and uniformity requirements are very high, so the practical application is difficult

4) Ultrasonic vibration pulping rheological deformation technology, the principle is to use ultrasonic waves to disturb the solidification process of metals and refine the grains, so as to obtain non-dendritic metal slurry. Low pollution, is a promising semi-solid pulping method, but due to complex equipment, immature technical conditions and other reasons, it has not been applied in actual production

5) Rheological technology of pulping by cooling body method. This kind of method has simple equipment, short process and low cost. It is especially suitable for semi-solid pulping technology of superalloys, but there are problems such as oxidation and serious gas absorption in light alloys.

This method has a good application prospect, but due to the existence of the rotating tube, the equipment is relatively complicated

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