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A short-process and high-efficiency production method for brass pipes

A production method and short process technology, applied in the direction of rolling force/roll gap control, etc., can solve the problems of high energy consumption, low product quality, small production capacity, etc., to achieve high energy utilization, reduce production costs, and reduce energy The effect of consumption

Active Publication Date: 2011-11-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of continuous casting-drawing production of copper alloy pipes are as follows: first, the current specification of the tube blanks can be produced, only tube blanks with an outer diameter of 42mm or less can be produced, and it is not easy to produce products with larger specifications, and the production Small capacity [Liu Huanai et al., Copper Alloy Tube and Bar Processing Technology. Beijing: Chemical Industry Press, 2009]
The second is that due to the gas floating, the tube billet of upward continuous casting has poor density and low product quality
However, there are problems in the production of tube blanks by hot continuous casting technology: ① only the continuous casting of small diameter (≤Ф50mm) and thin wall (≤3mm) tubes can be realized, and the casting speed is slow and the production efficiency is low. It is more suitable for the production of high-quality, precise and small brass pipes; ②Since the solid-liquid interface is near the outlet of the mold, the process control is difficult, and leakage accidents are prone to occur
But this invention also has the following problems: one, due to the high melting point of the white copper alloy, in order to obtain the required heat type temperature, the heat type adopts high-frequency induction heating, but the useful power factor of high-frequency induction heating is low, resulting in heat The energy consumption is larger when the type is heated, which increases the production cost; the second is that the chemical composition of brass and white copper is quite different, and the process parameters of continuous casting, forming processing and heat treatment are quite different
Due to the above reasons, the range of process parameters such as continuous casting, forming and heat treatment provided by the invention is only suitable for the production of white copper pipes, and cannot be applied to the production of brass pipes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: The production method of brass straight pipe with the size of Ф45×5mmH96

[0021] ①A pipe billet with a diameter of Ф120×30mm is prepared by horizontal continuous casting of hot and cold combined molds. The melting temperature of the copper alloy liquid is 1180°C, the holding temperature is 1200°C, the temperature of the hot mold (mold heating) is 1180°C, and resistance heating is adopted, with a heating power of 5kW. The cooling water (water-cooled copper sleeve) flow rate is 1000L / h, and the traction speed is 150mm / min.

[0022] ② The tube blank prepared in step 1 is subjected to 4-8 passes of three-roller periodic cold rolling, with an average deformation of 20%, and the deformation of each pass gradually decreases with the increase of cumulative deformation. Intermediate annealing may not be performed during the manufacturing process.

[0023] ③Bright annealing is carried out on the rolled pipe, the annealing temperature is 500°C, the annealing time is...

Embodiment 2

[0024] Example 2: The production method of brass straight pipe with the size of Ф10×0.5mmH80

[0025] ①Using hot-cold combination casting mold horizontal continuous casting to prepare tube billets with a diameter of Ф50×5mm, the melting temperature of the copper alloy liquid is 1100°C, the holding temperature is 1120°C, the hot mold (mold heating) temperature is 1100°C, resistance heating is used, and the heating power is 3kW. The cooling water (water-cooled copper sleeve) flow rate is 450L / h, and the traction speed is 200mm / min.

[0026] ② Carry out one planetary rolling on the tube blank prepared in step 1, and the total deformation amount is 90-95%.

[0027] ③Bright annealing is carried out on the rolled pipe, the annealing temperature is 400°C, the annealing time is 30min, the gas protection atmosphere in the furnace is 2% hydrogen + the balance nitrogen, and the pipe is purged with pure nitrogen gas, and the purge gas is continuously fed in, and the initial purge The s...

Embodiment 3

[0028] Example 3: The production method of the H80 brass coil with a size of Ф30×2mm

[0029] ①A pipe billet with a diameter of Ф100×15mm is prepared by horizontal continuous casting of a hot-cold combined mold. The melting temperature of the copper alloy liquid is 1100°C, the holding temperature is 1120°C, and the temperature of the hot mold (mold heating) is 1100°C. Resistance heating is used, and the heating power is 3kW. Cooling water (water-cooled copper sleeve) flow rate is 700L / h, traction speed is 150mm / min.

[0030] ② Carry out one planetary rolling on the tube blank prepared in step 1, with a total deformation of 40% to 90%.

[0031] ③ The rolled tube blank is subjected to 1-3 passes of series drawing or triple drawing, with a deformation of 15% to 25%, the purpose of which is to finish the pipe before coil drawing.

[0032] ④ Use an inverted coil machine for coil pulling, with an average pass elongation coefficient of 1.4, stretching passes of 3 to 4 passes, and ...

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Abstract

The invention belongs to the field of metal materials and relates to a short-flow efficient production method for brass tubes. The method is characterized in that: brass tube billets which have axial orientated tissue and high internal and external surface quality are produced efficiently by using the low-consumption hot and cold combination cast type continuous casting technology; the tube billets are subjected to subsequent forming directly under the condition that surfaces are not peeled, wherein intermediate annealing is not needed to be performed or only a little bit of low-temperature annealing is needed to produce the brass tubes efficiently. The hot and cold combination cast type continuous casting is characterized in that: a continuous casting crystallizer is formed by combining a hot section which is heated and a cold section which is subjected to forced cooling by circulating water, and the tube billets which are high in the quality of the surfaces and have the axial orientated tissue are prepared efficiently by controlling solidification interfaces of the tubes to be positioned nearby the junction of the hot section and the cold section. The method has the advantages of short production flow, low consumption, high yield and high production efficiency.

Description

technical field [0001] The invention belongs to the field of metal materials and relates to a short-flow and high-efficiency production method of brass straight tubes / coiled tubes. Background technique [0002] Brass is a copper alloy with zinc as the main element. It has excellent thermal conductivity, mechanical properties, processing properties and corrosion resistance. Generally, in order to improve the performance of brass, tin, aluminum, manganese and other metals are added to form a multi-element alloy, which is a special brass. For example, adding lead or bismuth to brass can improve the cutting performance of brass; adding tin can significantly improve the brass. Copper has the ability to resist seawater and ocean atmospheric corrosion; at the same time, adding multiple elements (aluminum, manganese, silicon, iron, tin, etc.) can also make high-strength, high-wear-resistant wear-resistant brass. Because of the above characteristics of brass, brass alloy pipes are ...

Claims

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Application Information

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IPC IPC(8): C22F1/08B22D11/045C21D1/26B21B37/58
Inventor 谢建新刘新华刘雪峰梅俊
Owner UNIV OF SCI & TECH BEIJING
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