Novel planetary tube rolling mill

Abstract

A planetary pipe rolling mill includes a feeding mechanism for feeding hollow casting blank, a planetary main machine (1) for rolling the hollow casting blank within which a roller group (11) and a rolling-die quick-cooling mechanism are provided, an inducing preheating mechanism (2) provided between the outlet of the feeding mechanism and the inlet of the planetary main machine (1) for preheating the hollow casting blank, and an inducing soaking mechanism (3) and a slow-cooling mechanism (4) provided at the outlet of the planetary main machine (1) in this order. The pipe having been rolled and quickly cooled is again heated by the inducing soaking mechanism (3) and slowly cooled by the slow-cooling mechanism (4). A planetary rolling method for copper alloy pipe comprises the following steps: machining the hollow casting blank, preheating the hollow casting blank by the inducing preheating mechanism (2), rolling the hollow casting blank by the planetary main machine (1), quickly cooling the resulting pipe by the rolling-die quick-cooling mechanism, and at last heating the pipe by the inducing soaking mechanism (3) once again and then slowly cooling the pipe by the slow-cooling mechanism (4) in protective atmosphere.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal processing and manufacturing, and in particular relates to a planetary rolling machine for rolling copper alloy tubes and a planetary rolling method for copper alloy tubes. Background technique [0002] Copper tube casting and rolling production technology is a short-process and continuous copper tube processing technology developed in the 1980s, especially for the large-scale continuous production of copper tubes for air-conditioning and refrigeration. Way. Due to the high heat transfer coefficient of red copper, no heating is required when rolling with a planetary rolling mill. Relying on the deformation during the rolling process and the large amount of heat generated by high friction, the temperature of the tube billet rises to 700 ° C, causing the tube billet to Dynamic recovery, recrystallization or grain refinement, the rolled tube billet can be directly stretched without annealin...

AI Technical Summary

Problems solved by technology

[0003] In order to improve the strength, hardness, corrosion resistance and other properties of copper so that it can adapt to the special working environment, one or more of zinc, aluminum, tin, nickel, iron, manganese, silicon and lead elements are added to the copper Copper alloys are formed. At present, the copper alloy tubes rolled by planetary rolling mills have the following disadvantages: 1. Since the heat transfer performance of copper alloys is greatly reduced compared with copper, the deformation resistance at room temperature, work hardening and deformation stress are significantly increased. The heat generated by deformation and friction has been difficult to meet the expected processing requirements. When the tube blank is deformed, local overheating causes the tube blank and the roll to bond, the alloy tube burns and cracks, and the part with insufficient temperature produces hardening stress under the action of large processing volume. Rolling failure due to cracking, etc.

2. The rolling process produces deformation at a large processing rate in an instant. Under the action of the rolling die's own lubrication and cooling, the deformed high-temperature alloy tube is cooled to below 60°C or even room temperature in a very short time, resulting in large deformation and rapid cooling. The stress makes the rolled copper alloy pipe hard and brittle, which affects the machinability and pipe performance of the subsequent drawing process, and it is difficult to realize the short process and automatic continuous production of copper alloy pipe

The two patents of "three-roll planetary pipe rolling mill" and "a cooling device for planetary pipe The cooling system of the tube machine has been improved, but the thermal deformation process of the alloy tube still cannot meet the process requirements, and it is difficult to achieve uniform dynamic recovery; the cooling method of the improved cooling system also has deficiencies, and cannot meet the requirements of subsequent cold-rolled tubes. or stretching process, etc., the continuous cold processing performance requirements, the industry urgently needs a high-efficiency, continuous production equipment to meet the production requirements of high-quality copper alloy tubes

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