High-frequency rotary precision-forging compounding method for metal composite tube and rod manufacturing

Abstract

The invention discloses a high-frequency rotary precision-forging compounding method for metal composite tube and rod manufacturing. The high-frequency rotary precision-forging compounding method comprises the following main process steps: (1) cleaning workpieces; (2) preparing for compounding; (3) forging and compounding: putting to-be-compounded metal composite tubes / rods on a feeding rack of a high-frequency rotary precision-forging machine, introducing the to-be-compounded metal composite tubes / rods into the high-frequency rotary precision-forging machine to forge under the pushing of a feeding system of the high-frequency rotary precision-forging machine, and forging until inner and outer layers of composite metal tubes / rods are tightly compounded; (4) completing the compounding: if lining tubes at the inner layer are metal tubes, dropping out core rods. The high-frequency rotary precision-forging compounding method has the advantages of low power consumption, easy operation, high product manufacturing efficiency, high bonding strength, high product surface flatness, short process flow and safe production. Compared with an existing process, the cost of the equipment is greatly reduced, the maintenance cost is relatively low and the requirements on field are relatively low; a plurality of layers of different metal tube rods can also be compounded in a multi-layer mode.

Description

technical field [0001] The invention relates to a manufacturing process of a metal composite pipe or a metal composite rod, in particular to a method for compounding pipes and rods of different metal materials through a rotary forging technology. Background technique [0002] The manufacturing process of metal composite pipe and rod is currently widely used in the following categories: [0003] The first is the centrifugal casting method; this is a force method that obtains bonding based on the interaction of molten metal with solid metal. The disadvantage of the composite steel pipe produced by this method is that in many cases, the surface of the tube billet must be machined, which increases the uneven wall thickness of the two layers of metal, and the transition will be formed due to the mutual washing and mixing of liquid metal during casting. layer. In addition, this method cannot produce a composite pipe whose outer layer is a light alloy. [0004] The second is the...

AI Technical Summary

Problems solved by technology

The disadvantage of the composite steel pipe produced by this method is that in many cases, the surface of the tube billet must be machined, which increases the uneven wall thickness of the two layers of metal, and the transition will be formed due to the mutual washing and mixing of liquid metal during casting. Floor

In addition, this method cannot produce composite pipes whose outer layer is light alloy

[0004] The second is thermal processing, such as extrusion or rolling; the disadvantages of this method are large power consumption, large equipment, and poor bonding strength of composite steel pipes produced by it.

[0005] The third is the cold drawing method, and its disadvantages are poor bonding strength, uneven tube density, and low yield

[0006] The fourth is the cladding welding method, the disadvantage of which is that it is difficult to produce inner composite steel pipes with thin-walled inner layers

[0007] The fifth is the explosive composite method. Its disadvantage is that the interface joint area is easy to form a waveform, and the temperature of the tube blank is limited. It is necessary to build a special explosion site or space, and special safety measures are required.

At present, the curved surface of the forging hammer in the rotary forging equipment is usually a curved surface with the law of parabola or cosine acceleration, and there is a single point contact between the curved surface of the forging hammer and the roller. The acceleration continuity is poor during contact, and the impact on the roller is large, which causes the vibration and noise of the whole equipment, but the impact acceleration on the workpiece is small, the impact time is long, the impact strength is small, the efficiency is low, and the forming accuracy is poor.

In addition, there is also the phenomenon that the hammer head wears quickly, the thickness of the forging hammer gasket needs to be adjusted frequently, the service life is short, resulting in low efficiency and inconsistent processing accuracy.

These defects make swaging technology only suitable for processing some small parts, and it is difficult to process larger parts, which limits the application range of swaging technology, such as making composite metal composite tubes / rods made of composite metal materials. limit

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