CN106756212A - The method that continuous casting even squeezes production precipitation strength type high-strength copper evanohm - Google Patents

Abstract

The invention relates to a method for producing precipitation-enhanced high-strength copper-chromium alloy by continuous casting and extrusion. The horizontal continuous casting method is used to form a copper alloy rod, and after on-line heating and solid solution, the billet is directly produced by continuous extrusion, and then cooled. After rolling and aging treatment, after finishing, products with performance and size that meet the requirements can be obtained. The invention adopts the continuous extrusion process to produce the high-performance copper-chromium-zirconium alloy material, and the production process is simplified to a certain extent, such processes as face milling, hot-rolling blanking and initial rolling are eliminated, and the number of intermediate rolling passes is reduced. The investment is reduced, the energy consumption is reduced, and the production efficiency and product yield are improved, which fully meets the goals of energy saving, emission reduction and efficient production followed by the sustainable development of the enterprise.

Description

Method for producing precipitation-strengthened high-strength copper-chromium alloy by continuous casting and extrusion

technical field

The invention relates to a production method of a precipitation-enhanced high-strength and high-conductivity copper alloy material, in particular to a continuous casting and extrusion production of a high-strength copper-chromium alloy material.

Background technique

Precipitation strengthening is to heat the supersaturated solid solution alloy at a certain temperature higher than room temperature, so that the solute atoms are precipitated from the supersaturated solid solution and form fine and dispersed second phase particles in the copper matrix. The method can not only greatly improve the strength of the copper alloy, but also has little damage to the electrical conductivity of the alloy. It is one of the commonly used strengthening methods for preparing high-strength and high-conductivity copper alloys, and Cu-Cr-Zr is a typical precipitation-strengthened copper alloy.

The most important feature of precipitation-strengthened copper alloys is the temperature-dependent equilibrium solid solubility. In order to obtain the best conditions for the precipitation hardening reaction, it is first necessary to carry out solid solution treatment on the alloy to produce a supersaturated solid solution at room temperature, and add alloying elements such as Cr and Zr with strong precipitation strengthening effects to copper, and at a sufficiently high temperature Heating the alloy, maintaining the solute in the solid solution at a fast enough cooling rate to achieve the purpose of solid solution; after that, the performance of the precipitation-strengthened copper alloy is improved by combining deformation strengthening and aging strengthening.

The traditional precipitation-strengthened copper alloy processing method is a three-stage method, that is, smelting ingots-hot processing-cold processing, among which hot processing includes hot extrusion, hot rolling, hot forging, etc. These processes lead to high energy consumption, pollute the environment, reduce Yield, increased production costs and equipment investment. Therefore, the key innovation direction of China's copper processing industry is short process, continuous, energy saving, environmental protection, low investment, and low cost. Continuous extrusion production just meets the above requirements and is the key innovation direction of copper processing industry.

The patent (Application No. 200810018995.9) proposes to use upward continuous casting and continuous extrusion to form precipitation-strengthened copper-iron alloys C19200 and C19400, and to use the traditional three-stage processing method of copper alloys, that is, smelting ingots-hot processing-cold processing The three stages are simplified into two stages of smelting upward casting and continuous extrusion. Utilizing the heat generated during the continuous extrusion process, the copper alloy is heated to 550-660°C, so as to achieve the purpose of solid solution and annealing.

However, this short-flow processing method is not suitable for precipitation-strengthened copper-chromium alloys. First, the high temperature 550-660°C generated by deformation during continuous extrusion is far lower than the solid solution temperature of copper-chromium alloys (commonly used solid solution temperature 900-966℃), the alloying elements are not completely dissolved, and the ideal performance cannot be obtained; the second is that the continuous extrusion deformation process is less than 1min, which is far lower than the commonly used 45min-1h solid solution time. If there is no solid solution and no components, the effect of precipitation strengthening cannot be exerted, and the performance of the formed alloy is far lower than that of the traditional processing method.

The main defect of the traditional production method of precipitation-strengthened copper alloy is that the manufacturing process often leads to high energy consumption, pollutes the environment, increases production costs and equipment investment, and the milling process causes a considerable amount of raw materials to be removed, reducing the yield rate and product production. The cost is also high. However, the short-process continuous extrusion molding method is too simplified, and the most important solution quenching heat treatment process is removed, resulting in reduced material properties after molding.

Contents of the invention

In order to overcome the above-mentioned defects, the present invention combines traditional processing methods with short-flow methods to provide a method for continuous casting and extrusion to produce precipitation-strengthened high-strength copper-chromium alloys. The method uses horizontal continuous casting to form copper alloy rods, which are heated online After solid solution quenching, continuous extrusion is used to directly produce a billet close to the final required shape, and then after cold rolling and aging treatment, after finishing, copper alloy materials with properties and dimensions that meet the requirements can be obtained.

The technical solution of the present invention is achieved in the following way: a method for producing precipitation-enhanced high-strength copper-chromium alloy by continuous casting and continuous extrusion, the specific process steps are as follows:

Step 1: Ingredients

The ingredients are prepared according to the chemical composition of the copper-chromium-zirconium alloy material, wherein: the chromium content is 0.3~1.5wt%, the zirconium content is 0.03~0.1wt%, and the rest is copper content;

Step 2: Production of copper-nickel-silicon alloy by horizontal continuous casting

The alloy melting temperature is controlled at 1200-1300°C, and the surface of the melt is covered with dried charcoal or carbon black, and then kept at 1250°C, the traction speed used is 10-50mm/s, and the diameter of the cast copper alloy rod is 23mm;

Step 3: On-line solution quenching treatment

The copper alloy rod produced by horizontal continuous casting is subjected to solution treatment, the solution treatment temperature is 900 ° C, the heating method is induction heating or continuous annealing furnace heating, the treatment time is 40 minutes, and the quenching is cooled by spraying water;

Step 4: Continuous Extrusion

The solid solution treated copper alloy rod material is fed into the continuous extruder with scale removal device through the rod material inlet of the extruder, and the oxide scale removal device is oxidized and peeled, and then the extrusion speed is controlled 1-3m/min extrusion molding;

Step 5: Cold rolling and aging treatment

The continuously extruded copper alloy strip blank is subjected to cold rolling deformation twice, each cold rolling deformation is 20-50%, artificial aging treatment is carried out between the two cold rolling formings, the aging temperature is 450°C, and the time is 2h.

Step 6: Finishing

Finishing and deforming the copper alloy strip blank after cold rolling and aging treatment to complete the finishing rolling process to obtain a lead frame material whose performance and size meet the requirements.

The beneficial effect of the present invention is: adopting continuous extrusion process to produce high-performance copper-chromium-zirconium alloy material, its production process has been simplified to a certain extent, and processes such as face milling, hot-rolled blanking and preliminary rolling have been removed, and intermediate rolling has been reduced. The company's equipment investment is reduced, energy consumption is reduced, production efficiency and product yield are improved, and it is fully in line with the goals of energy conservation, emission reduction and efficient production followed by the sustainable development of enterprises.

Description of drawings

Fig. 1 is a flow chart of the continuous casting and extrusion production process of the copper-chromium-zirconium alloy material of the present invention.

detailed description

The present invention will be further explained below in conjunction with specific embodiments, will help further understanding of the present invention, and the protection scope of the present invention is not limited by these embodiments, and the protection scope of the present invention is defined by the claims.

As shown in Figure 1, the copper-chromium-zirconium alloy material continuous casting and extrusion production process of the present invention:

(1) Production of copper-nickel-silicon alloy by horizontal continuous casting

The chemical composition of the alloy is as follows: chromium content 0.3~1.5wt%, zirconium content 0.03~0.1wt%, copper balance. Using high-quality copper as raw material, the alloy is added in the form of master alloy. The alloy smelting temperature is controlled at 1200-1300°C, the surface of the melt is covered with dried charcoal, and then kept at 1250°C, the traction speed used is 10-50mm/s, and the diameter of the cast copper alloy rod is 23mm.

(2) On-line solution quenching treatment

The copper alloy rod produced by horizontal continuous casting is subjected to solution treatment. The solution treatment temperature is 900°C. The heating method can be selected from induction heating or continuous annealing furnace heating. The treatment time is 40 minutes. The quenching is cooled by spraying water.

(3) Continuous extrusion molding

The solid solution treated copper alloy rod material is fed into the continuous extruder with scale removal device through the rod material inlet of the extruder, and the oxide scale removal device is oxidized and peeled, and then the extrusion speed is controlled It is extruded at 1-3m/min.

(4) Cold rolling and aging treatment

The continuously extruded copper alloy strip blank is subjected to cold rolling deformation twice, each cold rolling deformation is 20-50%, artificial aging treatment is carried out between the two cold rolling formings, the aging temperature is 450°C, and the time is 2h.

(5) Finishing

The product is finally finished and deformed to complete the finishing rolling process, and the product thickness specification meets the requirements of the finished product.

Claims (1)

1. a kind of method that continuous casting even squeezes production precipitation strength type high-strength copper evanohm, it is characterised in that：Its concrete technology is walked It is rapid as follows：

Step 1：Dispensing

Dispensing is carried out according to copper-chromium-zirconium alloy material chemical composition, wherein：Chromium content be 0.3 ~ 1.5wt%, zirconium content be 0.03 ~ 0.1 wt%, remaining is copper content；

Step 2：Horizontal continuous-casting produces corson alloy

Alloy melting temp is controlled at 1200-1300 DEG C, molten surface is covered with the charcoal or carbon black of drying, then at 1250 DEG C Insulation, hauling speed used is 10-50mm/s, and the copper alloy shank diameter that casting is obtained is 23mm；

Step 3：On-line solution Quenching Treatment

The copper alloy bar that horizontal continuous-casting is produced is carried out into solution treatment, solid solution temperature is 900 DEG C, mode of heating selection Sensing heating or continuous annealing stove heat, process time 40min, quenching use water-spraying control；

Step 4：Continuously extruding and molding

Bar material is sent into by the good copper alloy bar material of solution treatment by the bar material entrance of extruder and carries oxide skin removal device Continuous extruder in, aoxidized by oxide skin removal device and removed the peel, then control extrusion speed for 1-3m/min extrusion formings；

Step 5：Cold rolling and Ageing Treatment

Copper alloy made-up belt after continuously extruding and molding is carried out into cold-rolling deformation 2 times, each cold rolling reduction is 20-50%, twice Artificial aging treatment, 450 DEG C of aging temp, time 2h are carried out between cold rolling shaping；

Step 6：Finishing

Copper alloy made-up belt after cold rolling and Ageing Treatment is carried out into finishing deformation, finishing rolling step is completed, performance is obtained and size is full The blaster fuse frame material that foot is required.