Aluminum alloy semi-solid molding method and device

Abstract

The semi-solid molding method of the present invention comprises six parts as the traditional method: a mold, a main machine, an injection system, a pulping machine, a quantitative feeding system, and a holding furnace; the injection system, the pulping machine, and the quantitative feeding system are combined and called integrated pulping injection system, and the system is placed in the holding furnace. In order to adapt to the difficulty of molding the semi-solid slurry to carry less heat into the mold with large wall thickness, the semi-solid mold is divided into three layers according to the function, which greatly reduces the heat absorption capacity of the mold, due to the characteristics of the constant flow pump, the holding pressure after filling can reach 0.01 MPa-30 MPa, so low pressure casting, high pressure casting, differential pressure casting, liquid die forging and semi-solid extrusion forging can be unified in one kind of main machine.

1 . An aluminum alloy semi-solid molding device, wherein comprising a mold, a main machine, an injection system, a pulping machine, a quantitative feeding system and a holding furnace, the injection system, the pulping machine and the quantitative feeding system are placed in the holding furnace, and the mold is provided with a heat insulation and cooling structure. 
     
     
         2 . The aluminum alloy semi-solid molding device according to  claim 1 , wherein the device is suitable for semi-solid high pressure casting, semi-solid extrusion casting, semi-solid vacuum and low pressure casting, semi-solid pressure regulating casting, semi-solid differential pressure casting and semi-solid low pressure casting. 
     
     
         3 . The aluminum alloy semi-solid molding device according to  claim 1 , wherein the mold is provided with at least an outer layer, an intermediate layer and an inner layer, and the outer layer is rigid for bearing; the inner layer is thin for constraining the casting size; the intermediate layer is used to control the heat flux. 
     
     
         4 . The aluminum alloy semi-solid molding device according to  claim 3 , wherein the wall thickness of the inner layer is proportional to the slurry flow. 
     
     
         5 . The aluminum alloy semi-solid molding device according to  claim 3 , wherein the inner layer is divided into at least two sections on each module along the flow direction. 
     
     
         6 . The aluminum alloy semi-solid molding device according to  claim 1 , wherein the main machine is provided with an attachment means for changing the mold increasing force into the internal force of the mold. 
     
     
         7 . The aluminum alloy semi-solid molding device according to  claim 6 , wherein the attachment means is U-shaped caliper for a two-opening mold. 
     
     
         8 . The aluminum alloy semi-solid molding device according to  claim 6 , wherein the attachment means is locked by a frame for a four-opening mold. 
     
     
         9 . The aluminum alloy semi-solid molding device according to  claim 6 , wherein for a six-opening mold, the attachment means is capable of inserting a convex or concave portion of the front and rear or left and right side molds into a concave or convex portion of the top or bottom molds so as to lock the top and bottom molds, or the bottom and the top molds are locked by the inwardly extending steps of the front and rear, left and right side molds, and the side molds are locked by a ring or a square frame driven by an oil cylinder on the moving template. 
     
     
         10 . The aluminum alloy semi-solid molding device according to  claim 6 , wherein the attachment means converts a three-opening mold into a four-opening mold by using a dummy mold which does not participate in the molding and only plays the locking function, and converts a five-opening mold to a six-opening mold by using a dummy mold. 
     
     
         11 . The aluminum alloy semi-solid molding device according to  claim 1 , wherein the pulping machine is used for refining the slurry, the pulping machine comprises a driving mechanism and a refining mechanism, a refining portion of the refining mechanism inserts to the slurry to refine the slurry, the refining mechanism comprises a rotor and a stator, the stator is hollow inside, the rotor is placed inside the stator, and the driving mechanism drives the rotor to rotate inside the stator, the refining portion immersing in the slurry to perform the refining function is provided with a refining cavity, the rotor in the refining cavity is provided with a blade, and the bottom of the stator is provided with a suction port connected to the refining cavity, and a jet hole is defined in the sidewall of the stator in the refining cavity; the driving mechanism drives the rotor to rotate, and the blade rotates to form a negative pressure to make the slurry enter the refining cavity from the suction port to be refined and eject to the outside of the stator from the jet hole. 
     
     
         12 . The aluminum alloy semi-solid molding device according to  claim 11 , wherein the pulping machine is used for refining the slurry, the minimum gap between the rotor and the stator is 1-2000 μm, the diameter of the rotor is 3 cm-50 cm, the number of the blades of the rotor are 2-17, and the shape of the blade can be straight, forward bend or back bend. 
     
     
         13 . The aluminum alloy semi-solid molding device according to  claim 11 , wherein the pulping machine is used for refining the slurry, the hole diameter of the jet hole is 0.1-20 mm, the space height of the hole of the jet hole occupies from 2 cm to d (the diameter of the rotor). 
     
     
         14 . The aluminum alloy semi-solid molding device according to  claim 11 , wherein the aperture axis of the jet hole forms an angle of 90-45° with the axis of rotation of the rotor. 
     
     
         15 . The aluminum alloy semi-solid molding device according to  claim 11 , wherein the suction port of the pulping machine is single-sided or double-sided, and may be fully open or half open. 
     
     
         16 . The aluminum alloy semi-solid molding device according to  claim 1 , wherein the injection system and the slurry transporting are using a positive displacement pump, a rotary vane pump, a gear pump, a screw pump or a Rogowski pump. 
     
     
         17 . The aluminum alloy semi-solid molding device according to  claim 16 , wherein the rotary vane pump comprises a driving mechanism and an aluminum liquid transport mechanism, and the aluminum liquid transport mechanism comprises a rotor and a stator, the stator is hollow inside and the rotor is disposed inside the stator, the driving mechanism drives the rotor to rotate inside the stator, the transport portion of the stator disposed inside the slurry to perform the aluminum liquid transport function is provided with an aluminum liquid receiving chamber, and the rotor in the aluminum liquid receiving chamber is provided with a curved rotating piece or a rectangular rotating piece, the number of which is 2-15, the thickness is 2-15 mm, the length is 5-100 mm, and the side wall of the stator is provided with a liquid suction port and a liquid discharge port connected to the aluminum liquid receiving cavity, and the liquid discharge port is connected with a guide cylinder. 
     
     
         18 . The aluminum alloy semi-solid molding device according to  claim 17 , wherein a closing angle between the liquid suction port and the liquid discharge port is larger than a bisector angle of the rotor, and the root of the blade is disposed with a pressure equalization groove, the low pressure side and the low pressure port of the pressure equalization groove are connected, and the high pressure side and the high pressure port are connected. 
     
     
         19 . The aluminum alloy semi-solid molding device according to  claim 17 , wherein a high temperature resistant sealing ring and gasket are arranged between the rotor and the stator in the upper portion of the aluminum liquid receiving chamber, and the material thereof is graphite, carbon fiber or high temperature resistant composite material. 
     
     
         20 . The aluminum alloy semi-solid molding device according to  claim 1 , wherein the material of the injection system and the pulping machine is made of graphite, CC fiber, ceramic material, metal molybdenum, tungsten or composite material of metal alloy with surface coating or plating with molybdenum, tungsten or other aluminum corrosion resistant. 
     
     
         21 . The aluminum alloy semi-solid molding device according to  claim 1 , wherein the heating belt of the holding furnace is independently controlled by 2-5 layers to ensure that the furnace temperature is high at the top and low at the bottom, and the knotting furnace can use a silicon carbon rod or the like for reflection from the upper portion to heat the aluminum water to cause the furnace temperature of high at the top and low at the bottom so as to meet the needs of the pulping, the bottom of the crucible is provided with a cooling device, and the height to diameter ratio of the crucible is 1.2-3.