Semi-solid state metal molding multi-direction extrusion mold for refrigerator and air-conditioning compressor crankshafts

Abstract

The invention relates to a semi-solid state metal molding multi-direction extrusion mold for refrigerator and air-conditioning compressor crankshafts. The semi-solid state metal molding multi-direction extrusion mold comprises a center fixation mold, wherein a vertical movement mold is inserted on the upper end of the center fixation mold, and is connected with a top hydraulic cylinder piston rod, horizontal movement molds are symmetrically arranged on the center fixation mold respectively along a first horizontal direction and a second horizontal direction, the first horizontal direction is perpendicular to the second horizontal direction, the horizontal movement molds are respectively connected with horizontal hydraulic cylinder piston rods symmetrically arranged on the first horizontal direction and the second horizontal direction, the center fixation mold is provided with a center hole, the center hole and a punch guide sleeve are matchedly arranged, a filling punch is arranged inside the punch guide sleeve, and the bottom of the filling punch is connected with a bottom hydraulic cylinder piston rod. According to the present invention, the crankshaft mold adopts the eight-part-in-one-mold arrangement way, the horizontal movement mold, the vertical movement mold and the center fixation mold form the mold cavity, such that the horizontal movement mold, the vertical movement mold and the filling punch conjointly apply force to extrude the mold cavity during a crankshaft part molding process, the force applied on various positions of the part is uniform, and advantages of easy mold filling and splashing resistance are provided.

Description

technical field [0001] The invention belongs to the technical field of semi-solid multi-directional extrusion forming, and in particular relates to a semi-solid metal forming multi-directional extrusion die for crankshafts of refrigerators and air-conditioning compressors. Background technique [0002] Refrigerator and air conditioner compressor crankshaft is one of the important moving parts in the compressor, and the stress is severe. Under the action of periodic air pressure and inertial force, the crankshaft produces alternating bending stress and torsional stress, which requires extremely high rigidity, strength and wear resistance of the formed parts, and even higher requirements for fatigue strength. At present, the manufacture of crankshaft mainly adopts the metal mold gravity casting process to produce the blank of crankshaft. After the liquid metal is poured into the metal mold cavity at a certain speed, a certain pressure is maintained by the self-weight of the hy...

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Problems solved by technology

[0003] The disadvantages of the forming process of the crankshafts of refrigerators and air-conditioning compressors above are firstly that the blanks have a large gating and riser system during gravity casting, the material margin is large, the machining volume of the castings is large, and the material utilization rate is low.

In addition, the pressure on the castings during the gravity casting process is very small, and there are many defects in the blanks during the solidification process. The mechanical properties cannot fully meet the requirements of the crankshaft parts, the scrap rate is high, and the production efficiency is low.

In the liquid metal squeeze casting process, only one punch moves and pressurizes, which leads to serious pressure attenuation along the material filling path, uneven force on the material, difficulty in forming complex parts, and high filling temperature of the material in the liquid metal squeeze casting process. , large thermal shock to the mold

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