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Anti-Gravity Forging and Classification Approach
2016-03-29

1. Brief introduction

Anti-gravity is forging the liquid metal at the end opposite to the gravity force effect of filling, feeding and condensate forging a way.

Compared with forging forging and extrusion pressure, force feeding and end of filling the applied smaller, and therefore, the liquid metal activities in the process of filling is very smooth, but compared with the gravity forging, casting but at a certain pressure By the end of the feeding and condensation, thus producing ambitious approach to quality castings.

2. Classification

Anti-gravity forging, according to the onset of pressure is not the same way, it can be further divided into forging differential pressure, low pressure forging, forging regulator, vacuum casting and forging complex anti-gravity type. Construction equipment from the point of view, forged differential pressure, pressure forging, vacuum casting and forging are made of composite antigravity way up and down the room, that is placed under the holding furnace room, placed on the mold chamber, a low pressure forging only use the lower chamber, mold into atmosphere. Do not attack the same way anti-gravity forging pressure approach and features are as follows (anti-gravity forging schematic diagram):

(1) Low voltage and low voltage forging forging, casting is under the atmospheric environment, the lower chamber intake, constitute pressure, pressure under the effect of the end of the stalk, filling and packing sectors. The required simple equipment, simple operation, filling process control briefly. Under normal circumstances, as long as the security boost pressure when satisfy the request, the same can get excellent casting feeding. Compared to other anti-gravity forging methods, the use of low-pressure forging a broader scale. Due to the low pressure forging, the mold is under the atmospheric environment, when the use of metal Forging, simple metal end-type opening and closing the top of the casting and, therefore, low pressure forging metal is widely used in the production of high quality castings request such as car wheels, cylinder block and head castings. In the low-pressure sand forging, molding can be summed up a lot of high-quality castings.

(2) Vacuum casting vacuum casting, the lower chamber in the atmospheric environment, the chamber is evacuated constitute pressure, differential pressure effect at the end of the stalk, filling and packing sectors. Since the mold is under the vacuum environment, so that the liquid metal filling can be better, but set by the filling pressure is limited, small condensation pressure, feeding ability is weak, suitable for forming a small thin-walled castings.

(3) Differential Pressure forging forging, there are two ways to establish a pressure difference: the exhaust method, the intake under law

Pressure forging, not only can end the filling and feeding under pressure, and since the mold is under a pressure, better performance riser feeding, progress density fine casting. This approach is suitable for the production of forging a large thick-walled castings.

(4) When the regulator forging forging together the upper and lower vacuum chamber, arrived at the designated degree of vacuum, the lower chamber intake, constitute pressure, pressure under the effect of the end of the stalk and links after filling, in accordance with the upper and lower end of the filling chamber together under pressure when intake, so that the mold in a positive environment, to enhance the casting feeding ability. The advantages are: the performance of both the liquid metal filling can be conducive to forming thin-walled castings, but also under the pressure of the end of feeding, progressive density fine casting. This approach requires precise control of forging pressure when pressurized, high request for control of the system.

3. Features

(1) Filling speed controllable: Anti-gravity forging typically used for the production of non-ferrous alloy castings, molded to the internal quality of the casting, especially the thickness of the scale and speed of filling a relatively strict request, the filling speed can end computer accurate control.

(2) Good formability, smooth surface: anti-gravity forging, forming liquid metal is filled under pressure in the technical parameters reasonable in the circumstances, castings made clear generalization, on the production of thin-walled parts, especially ; pressurized gas is filled in the space of sand and sand between the molten metal and the vapor layer constituting the protective layer from the two compartments, the molten metal can be reduced when the anti-gravity forging for thermal and chemical effects of mold, casting can be reduced the appearance of roughness.

(3) Fine grain casting, organized crime, high mechanical properties: the crystallization of liquid metal under pressure condensation, the initial setting of dendrites at the onset of the effect of pressure will be deformed, broken, and the cooling speed, so the grains fine; together, pressure can improve feeding and to suppress the separation of the liquid metal in the gas, so loose and micro pores greatly reduced. Therefore, the mechanical properties of castings can be significantly improved.

(4) Can be controlled atmosphere at the end of the casting: Anti-gravity forging, can the upper chamber, the lower chamber may be manipulated up and down the room atmosphere. When using anti-gravity casting forging aluminum alloy castings together, use compressed air to dry oil, but on magnesium alloy, the molten metal and the mold must pay attention to the ambience, since the magnesium alloy in the air will attack burned. The use of controlled atmosphere should be based on the quality of casting and casting requests summary scale resolution and other factors.

(5) Progress in the utilization rate of metal: when anti-gravity forging, casting condensation can continue to be shortened from the molten metal within the gate feeding; squeeze filter combined with pressure and plastic deformation effect, reinforced riser feeding effect, the scale can be reduced accordingly and the riser is not required.

(6) Can be heat treated casting: Forged comparison with the pressure, the use of anti-gravity forging approach produced when casting, filling slow, smooth surface, the gas can be smoothly discharged into the type, so that the internal casting porosity little to no , it can be like gravity casting forging the same heat treatment.