Novel planetary tube rolling mill and planetary rolling method for copper alloy tubes

Abstract

The invention discloses a novel planetary tube rolling mill and a planetary rolling method for copper alloy tubes. The planetary tube rolling mill comprises a feed mechanism used for conveying hollow casting blanks, and a planetary main frame used for casting and rolling the hollow casting blanks. A roller set and a rolling die quick cooling mechanism are arranged in the planetary main frame; an induction preheating mechanism for preheating the hollow casting blanks is arranged between the discharge end of the feed mechanism and the feed end of the planetary main frame; the discharge end of the planetary main frame is sequentially provided with an induction soaking mechanism and a slow cooling mechanism; and tubes rolled and quickly cooled are heated by the induction soaking mechanism andthe heated tubes are slowly cooled by the slow cooling mechanism. The novel planetary tube rolling mill can replace the matching of an extrusion procedure with a horizontal caster, a straightening and milling machine, a continuous tensioning machine, an online continuous cutting machine and the like, and realizes automatic, continuous and short-flow production of high-quality copper alloy tubes.

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...

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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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