Production process of super long brass condenser pipe
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A production process and condenser tube technology, which is applied in the field of ultra-long brass condenser tube production process, can solve the problems of short product length, low yield rate, and high energy consumption, and achieve increased yield rate, high production efficiency, and high yield Effect
Inactive Publication Date: 2012-08-01
CHINA NERIN ENG
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[0005] The purpose of the present invention is to provide a production process for super-long brass condenser tubes, which overcomes the shortcomings of the traditional brass condenser tube production process, such as low yield, high energy consumption, and short product length.
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[0010] Firstly, the large-scale ingots from the melting and casting workshop, with a specification of Φ(250-300)×(450-600)mm, are sent to the ingot induction heating furnace for preheating and homogenization treatment, and the temperature is 700-800°C. Then the preheated ingot is sent to the dephosphorization cleaning system to remove the scale produced during the heating process, and then the ingot with good quality is transported into the extrusion cylinder through the pushing device, and the peeling extrusion process is adopted, and the extrusion ratio λ is 30~40, extrude the tube billet with a length of 10~15 m, and then enter the tube billet straightening machine after cutting the head and tail for straightening. The straightened brass condenser pipe billet enters the pickling system and adopts forced circulation The pickling method avoids acid mist corrosion and obtains a bright tube billet with good quality. The pickled tube billet enters a cold rolling mill for cold rol...
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Abstract
The invention relates to a production process of a super long brass condenser pipe, comprising the following steps of: preheating a cast ingot, peeling and extruding, scale sawing, straightening, forced circulation acid washing, cold rolling, induction continuous annealing, vertical rolling, secondary series stretching, scale sawing, intermediate annealing with protective atmosphere, multi-pass chain type stretching, finishing, cleaning, finished product annealing with protective atmosphere and packaging. According to the production process disclosed by the invention, a large-cast-ingot high-extrusion-ratio is adopted, thus extrusion finished product ratio is improved; a forced circulation acid washing method is adopted, thus environmental protection is enhanced and production operational safety is guaranteed; induction cast ingot heating and online induction intermediate annealing are adopted, thus energy consumption is reduced; a vertical rolling process after online induction is adopted, thus floor area of the process in a workshop is reduced; higher cold rolling elongation is adopted, thus flow of the production process is shortened and production efficiency is improved; longer intermediate product production is adopted, thus number of stretching manufacturing heads is reduced, and finished product ratio is improved; and a super long straight bar condenser pipe is produced, thus application range of the product is expanded.
Description
[0001] technical field [0002] The invention relates to a production process of copper and copper alloy pipes, in particular to a production process of an ultra-long brass condenser tube. Background technique [0003] Traditional brass condensing tubes have long used the production process of extrusion-pickling-cold rolling or chain stretching-intermediate annealing-chain stretching-finishing-cleaning-finished product annealing. The disadvantages are as follows: (1) Usually extrusion The tonnage of the machine is 16MN~31.5MN, the specification of the extruded ingot is Φ(165mm~250)mm×(250~350)mm, the weight of the ingot ranges from 45kg~150kg, and the extrusion yield is 70%~80%. The ingot is light in weight and the yield rate is low, so that the energy consumption increases, the production efficiency is low, and the production cost is high. (2) The acid mist in the pickling process not only brings difficulties to workers’ operation, but also corrodes the steel column...
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