A connection device for semi-solid continuous casting and electromagnetic forming of composite bearing

Abstract

The invention discloses a semisolid continuous casting and electromagnetic forming connecting device for compound bearing pads. The semisolid continuous casting and electromagnetic forming connecting device comprises a lower cushion block. A steel bushing is connected into a center hole of the lower cushion block, an extrusion plug rod is matched with the steel bushing, a middle block is fixedly connected to the upper side of the lower cushion block, a movable mold is arranged on the upper side of the middle block, and an electromagnetic bulging device is connected to a recessed portion of the lower portion of the movable mold and can extend into an inner hole of the middle block. When the semisolid continuous casting and electromagnetic forming connecting device is used, a prepared semisolid blank and a steel back of a bearing pad are respectively placed in a preheated cavity, then the mold is closed, extrusion mold filling and pressure maintaining are carried out, a mold filling part is subjected to high bulging by the aid of electromagnetic force generated by the electromagnetic bulging device so that the mold filling part can be closely combined with the steel back of the bearing pad, and a workpiece can be ultimately fetched after the mold is opened. The semisolid continuous casting and electromagnetic forming connecting device has the advantages that the mold filling part of the compound bearing pad and the steel back of the bearing pad can be electromagnetically formed and connected with each other by the aid of the characteristic that the electromagnetic bulging device can provide extremely high pressures within an extremely short time, technological procedures are simple, the semisolid continuous casting and electromagnetic forming connecting device is high in efficiency and low in cost, and the like.

Description

technical field [0001] The invention belongs to the technical field of metal semi-solid forming, and in particular relates to a connecting device for semi-solid continuous casting and electromagnetic forming of composite bearing bushes. Background technique [0002] The so-called semi-solid forming is to heat the metal to the temperature between the solidus line and the liquidus line, and keep it warm for a certain period of time to obtain spherical or nearly spherical grains, and then die-cast, extrude or die-forge it. It is a forming method between casting and forging. Spherical or nearly spherical semi-solid slurry has the advantages of good fluidity, low forming force and good performance of formed parts, so this process has received more and more attention. [0003] Electromagnetic forming is a rapid manufacturing technology that uses Loren magnetic force to form metal materials. It belongs to high-speed forming. It has the advantages of simple tooling, no lubrication ...

AI Technical Summary

Problems solved by technology

At present, among the two types of bearing materials mainly used in automobile engine bearings, copper-based and aluminum-based alloys, aluminum-based bearing materials are widely used because of their superior thermal conductivity and corrosion resistance, but their strength is relatively low. The most common method is to compound the aluminum-based alloy on the steel base plate by a certain method to form a steel-backed aluminum-based bimetal composite board to make up for the shortcomings of the aluminum-based alloy’s insufficient strength and hardness, and then, the steel-backed aluminum-based bimetallic composite board The metal composite plate is rolled and welded into a cylinder, and then the bearing bush is machined into shape

This method can well make up for the shortcomings of insufficient strength and hardness of aluminum-based alloys, but there are still poor wear resistance of aluminum-based alloys, the interface bonding strength of composite plates is not easy to control, the welding strength of steel plates after welding into cylinders is not high, and the follow-up machine Disadvantages such as difficult processing, complex manufacturing process of the entire bearing bush, and high cost

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