Extrusion moulding method for shaft parts with flanges, and special extrusion mould

Abstract

The invention relates to an extrusion moulding method for shaft parts with flanges, and a special extrusion mould. The adopted extrusion moulding method comprises the following steps: 1, placing a blank material in a female die, wherein the extrusion moulding mould comprises an external male die with a center hole extending along the axial direction, an internal male die is arranged in the center hole of the external male die in a penetrating manner, the hole wall of the center hole of the external male die is matched with the peripheral wall of the internal male die in a guiding sliding manner, a corresponding power output shaft of a press drives the external male die to extrude the blank material and downwards moves to reach the thickness of the flange of the required part; 2, ejecting the external male die to be kept stable on the blank material, wherein the press and a power output shaft which is in transmission connection with the corresponding internal male die drive the internal male die to downwards extrude the blank material, and the required part is formed through extrusion; and 3, completing the extrusion, wherein the press drives the external male die and the internal male die to return to eject the formed part. According to the extrusion moulding method, by adopting sequential extrusion moulding, the one-time extrusion area is small, the extrusion force required by one-time extrusion is small, the input of equipment is reduced by adopting the equipment with small tonnage, and the production cost is lowered.

Description

technical field [0001] The invention relates to the technical field of metal extrusion forming, in particular to an extrusion forming method of a shaft part with a flange and a special extrusion die. Background technique [0002] When forming shaft parts with flanges, there are generally two methods used: first, extrusion forming, that is, the process of extruding a billet with a diameter equal to the flange diameter of the desired part on a press. In extrusion molding, the larger the extrusion area, the greater the extrusion force required. Therefore, when the diameter of the flange of the part is greatly different from the diameter of the rod, the extrusion force required for one-time extrusion is larger. If it is large, the tonnage of the forming equipment that needs to be used is large and the cost of equipment investment is high; second, upsetting forming, that is, the flange with the required diameter is forged on the forging equipment from a blank with a diameter equa...

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Problems solved by technology

[0002] When forming shaft parts with flanges, there are generally two methods used: first, extrusion forming, that is, the process of extruding a billet with a diameter equal to the flange diameter of the desired part on a press. In extrusion molding, the larger the extrusion area, the greater the extrusion force required. Therefore, when the diameter of the flange of the part is greatly different from the diameter of the rod, the extrusion force required for one-time extrusion is larger. If it is large, the tonnage of the forming equipment that needs to be used is large and the cost of equipment investment is high; second, upsetting forming, that is, the flange with the required diameter is forged on the forging equipment from a blank with a diameter equal to the diameter of the rod of the required part , but due to the limited stroke of the forging hammer in the forging equipment, it is impossible to form shaft parts with long rods and large flange diameters

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