阅读说明：本技术 一种采用水平连铸铜锰合金的生产工艺 (Production process for horizontally continuously casting copper-manganese alloy ) 是由 刘琦 王朝阳 贺猛 杨红艳 唐丽尖 王群 刘向东 张青队 梁建斌 于 2021-09-06 设计创作，主要内容包括：本发明公开了一种采用水平连铸铜锰合金的生产工艺,具体包括：配料；首次铸造：首次装炉、首次熔炼、精炼除气、铸造、浇铸、铸坯冷却；连续铸造；本发明整体工艺设计合理,制备的铜锰合金,成分均匀一致性好,组织致密,少气孔、夹杂,无宏观、微观偏析等缺陷；并且本发明采用水平连铸的方法能够形成规模化生产,整个工艺具备工艺稳定、操作简便、熔铸生产成本低廉的优势。(The invention discloses a production process for horizontally and continuously casting a copper-manganese alloy, which specifically comprises the following steps: preparing materials; casting for the first time: charging for the first time, smelting for the first time, refining and degassing, casting and cooling a casting blank; continuous casting; the whole process design is reasonable, and the prepared copper-manganese alloy has good uniformity of components, compact structure, less pores and impurities, and no defects of macro segregation, micro segregation and the like; the invention adopts a horizontal continuous casting method to form large-scale production, and the whole process has the advantages of stable process, simple and convenient operation and low casting production cost.)

1. A production process for horizontally continuously casting a copper-manganese alloy is characterized by comprising the following steps:

s1: ingredients

According to the percentage content: 2-10% of Mn element, 0.1-2.0% of Si element and the balance of Cu element;

s2: first casting

S2-1: first charging

Sequentially filling a fusing agent, a covering agent and a prepared Cu element raw material into a heating furnace; the number of the heating furnaces is three, namely a front furnace and two rear furnaces;

s2-2: first melting

Heating for melting, specifically: when the cold furnace is started, the front furnace is firstly melted, when the Cu element raw material begins to melt, the Mn element raw material is added into the front furnace, and when the front furnace begins to melt, the two rear furnaces begin to heat;

s2-3: refining degassing

Degassing is started when the temperature rises to 1180 ℃, and the process sequentially comprises the following steps: argon degassing and CuMg alloy deoxidation; then adding a copper-silicon intermediate alloy and adjusting to a silicon content target value;

s2-4: casting

Keeping the temperature unchanged when the temperature of the front furnace rises to 1230-1280 ℃, and starting casting;

s2-5: casting of

Ensuring the completion of smelting, refining and degassing in two rear furnaces within 10-15 min after casting; starting to dump one of the rear furnaces towards the front furnace, starting the wire feeding machine when the rear furnace begins to dump, and starting to feed wires towards the front furnace; sampling every 20min for component detection, and adjusting the wire feeding speed in time when the component content is not appropriate;

s2-6: cooling of casting blank

The casting blank is firstly cooled by a crystallizer in a water cooling mode, and the casting blank pulled out after solidification is secondarily cooled in a water spray mode;

s3: continuous casting

After one of the rear furnaces is completely dumped, the other rear furnace is dumped; the poured rear furnace is subjected to the steps of material melting, refining degassing and casting, and then the poured rear furnace is further replaced to be poured into the front furnace; the two rear furnaces are alternately operated all the time, wherein when one rear furnace is dumped, the other rear furnace starts to melt materials.

2. The process for producing horizontally continuously cast Cu-Mn alloy as claimed in claim 1, wherein the Mn element S1 is added in the form of CuMn37 master alloy wire; si element is added in the form of CuSi16 intermediate alloy; the Cu element is added in the form of an electrolytic copper plate.

3. The production process of the horizontally continuous cast copper-manganese alloy according to claim 1, wherein the solvent S2-1 is a mixture of sodium fluoride and calcium fluoride in a mass ratio of 1-2: 1.5; the covering agent is a mixture of charcoal and glass according to a mass ratio of 1-1.5: 1.

4. The production process of copper-manganese alloy by horizontal continuous casting according to claim 1, wherein the melting of S2-2 and S3 is carried out by a step-type temperature rise mode, specifically: and starting heat preservation when the temperature is raised to 300 ℃, wherein the heat preservation time is 30-45 min, and carrying out heat preservation treatment at the temperature raising stage of 100-110 ℃ until the materials are melted.

5. The production process of horizontally continuously casting the copper-manganese alloy according to claim 1, wherein the S2-2 is protected by inert gas at the furnace mouth during the heating melting process.

6. The production process of horizontally continuously casting the copper-manganese alloy according to claim 1, wherein the S2-2 is used for detecting the Mn content by crucible sampling during smelting, and the melt composition is adjusted until the Mn content reaches a target value.

7. The production process of copper-manganese alloy by horizontal continuous casting according to claim 1, wherein said argon degassing of S2-3 is specifically: and introducing argon into molten copper by using a graphite rod, and keeping for 25-30 min.

8. The production process of the copper-manganese alloy by adopting the horizontal continuous casting according to the claim 1, wherein the deoxidation of the CuMg alloy of S2-3 is specifically as follows: and directly adding 0.08-0.1% of copper-magnesium alloy into the molten alloy solution according to the mass percentage.

9. The process of claim 1, wherein the feeding speed is S2-5 casting speed is strand diameter target component content/wire diameter/intermediate alloy component/yield.

10. The production process of the horizontal continuous casting copper-manganese alloy according to claim 1, wherein the specific steps of S2-6 are as follows: the temperature of the casting blank is 25-32 ℃ by utilizing a crystallizer, and the flow rate is 3m³And cooling the casting blank which is solidified at a position 100-150 mm away from the crystallizer for the first time by cooling water for the first time, and cooling the casting blank which is pulled out in a water mist spraying mode.

Technical Field

The invention relates to the technical field of copper-manganese alloy preparation, in particular to a production process for horizontally continuously casting a copper-manganese alloy.

Background

The copper-manganese alloy is a resistance material, is a basic material for manufacturing resistance elements in electronic instruments, measuring instruments and other industrial devices, and is widely applied to various fields of motors, instruments and meters, automobiles, aerospace, missile atomic energy and the like. It has very small temperature coefficient of resistance, low electric heating potential to copper, high stability of resistance and high resistivity, is a superior resistance alloy material, and can be made into powder, wire, foil, sheet, strip, rod, tube, etc., and the surface can be coated with various insulating materials. The method is mainly used for manufacturing standard resistors, separators, precise or common resistance elements, high-grade metering voltage, current, bridges, potential difference meters and precise resistance elements of other instruments, and is more suitable for manufacturing the resistance elements of the standard resistors for the reference. The low-temperature-coefficient and low-thermal electromotive force sensor has the characteristics of low temperature coefficient, low thermal electromotive force, good long-term stability, low inductance, high pulse load and the like.

The chip resistor is manufactured into a chip resistor product, and has a wide application range, such as automobile electronics, power electronics, driving technology, power detection, medical technology and the like.

The lap resistance is formed by welding copper and an alloy material by adopting high-energy electron beams, and can be almost punched and bent into any shape, thereby flexibly meeting the requirements of different applications and designs. Due to the excellent performance, the material is widely used in the fields of mobile phones, power grids, new energy automobiles and the like, and has a very wide prospect.

At present, high-end manganese-copper alloys in domestic markets are imported, although non-vacuum melting is mostly adopted in domestic production processes, the produced alloy materials are high in impurity content and uneven in component structure, and the resistivity and the resistance temperature coefficient of the manufactured chip resistor are unqualified, so that large-scale production cannot be formed.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a production process for horizontally continuously casting a copper-manganese alloy.

The technical scheme of the invention is as follows: a production process for horizontally continuously casting a copper-manganese alloy specifically comprises the following steps:

s1: ingredients

According to the percentage content: 2-10% of Mn element, 0.1-2.0% of Si element and the balance of Cu element;

s2: first casting

S2-1: first charging

Sequentially filling a fusing agent, a covering agent and a prepared Cu element raw material into a heating furnace; the number of the heating furnaces is three, namely a front furnace and two rear furnaces;

s2-2: first melting

Heating for melting, specifically: when the cold furnace is started, the front furnace is firstly melted, when the Cu element raw material begins to melt, the Mn element raw material is added into the front furnace, and when the front furnace begins to melt, the two rear furnaces begin to heat;

s2-3: refining degassing

Degassing is started when the temperature rises to 1180 ℃, and the process sequentially comprises the following steps: argon degassing and CuMg alloy deoxidation; then adding a copper-silicon intermediate alloy and adjusting to a silicon content target value;

s2-4: casting

Keeping the temperature unchanged when the temperature of the front furnace rises to 1230-1280 ℃, and starting casting;

s2-5: casting of

Ensuring the completion of smelting, refining and degassing in two rear furnaces within 10-15 min after casting; starting to dump one of the rear furnaces towards the front furnace, starting the wire feeding machine when the rear furnace begins to dump, and starting to feed wires towards the front furnace; sampling every 20min to detect components, and adjusting the wire feeding speed in time when the component content is not appropriate;

s2-6: cooling of casting blank

The casting blank is firstly cooled by a crystallizer in a water cooling mode, and the casting blank pulled out after solidification is secondarily cooled in a water spray mode;

s3: continuous casting

After one of the rear furnaces is completely dumped, the other rear furnace is dumped; the poured rear furnace is subjected to the steps of material melting, refining degassing and casting, and then the poured rear furnace is further replaced to be poured into the front furnace; the two rear furnaces are alternately operated all the time, wherein when one rear furnace is dumped, the other rear furnace starts to melt materials.

Further, the Mn element S1 is added in the form of CuMn37 master alloy wire; si element is added in the form of CuSi16 intermediate alloy; adding Cu element in the form of electrolytic copper plate; the problem that more impurities are brought by raw materials can be effectively avoided.

Further, the solvent of S2-1 is a mixture of sodium fluoride and calcium fluoride in a mass ratio of 1-2: 1.5; the covering agent is a mixture of charcoal and glass according to a mass ratio of 1-1.5: 1.

Further, the melting of S2-2 and S3 is carried out in a step-type temperature rising mode, specifically: and starting heat preservation when the temperature is raised to 300 ℃, wherein the heat preservation time is 30-45 min, and carrying out heat preservation treatment at the temperature raising stage of 100-110 ℃ until the materials are melted.

Further, in the process of heating and melting, the S2-2 is protected by inert gas at the furnace mouth; the defect that the surface of the alloy liquid is oxidized to easily form air hole oxide inclusion in the atmospheric environment can be effectively avoided.

Further, the S2-2 is used for sampling and detecting the Mn content by using a crucible during smelting, and the melt composition is adjusted until the Mn content reaches a target value; the Mn element is burnt out along with the change of time after the material is melted at high temperature, so the Mn element is sampled and detected to adjust the Mn content.

Further, the argon degassing in S2-3 specifically includes: introducing argon into molten copper by using a graphite rod, and keeping for 25-30 min

Further, the deoxidation of the CuMg alloy in S2-3 specifically comprises the following steps: and directly adding 0.08-0.1% of copper-magnesium alloy into the molten alloy solution according to the mass percentage (volume ratio).

Further, the wire feeding speed of S2-5 is casting speed, strand diameter, target composition content/wire diameter/master alloy composition/yield.

Further, the specific steps of S2-6 are: the temperature of the casting blank is 25-32 ℃ by utilizing a crystallizer, and the flow rate is 3m³And cooling the casting blank which is solidified at a position 100-150 mm away from the crystallizer for the first time by cooling water for the first time, and cooling the casting blank which is pulled out in a water mist spraying mode.

Compared with the prior art, the invention has the beneficial effects that: the whole process design is reasonable, and the prepared copper-manganese alloy has good uniformity of components, compact structure, less pores and impurities, and no defects of macro segregation, micro segregation and the like; the invention adopts a horizontal continuous casting method to form large-scale production, and the whole process has the advantages of stable process, simple and convenient operation and low casting production cost.

Detailed Description

Example 1:

a production process for horizontally continuously casting a copper-manganese alloy specifically comprises the following steps:

s1: ingredients

According to the percentage content: 2-10% of Mn element, 0.1-2.0% of Si element and the balance of Cu element; wherein, Mn element is added in the form of CuMn37 intermediate alloy wire; si element is added in the form of CuSi16 intermediate alloy; adding Cu element in the form of electrolytic copper plate;

s2: first casting

S2-1: first charging

Sequentially filling a fusing agent, a covering agent and a prepared Cu element raw material into a heating furnace; the number of the heating furnaces is three, namely a front furnace and two rear furnaces; wherein the using amount of the solvent is 0.05 percent of the mass of the Cu element raw material, and the solvent is a mixture of sodium fluoride and calcium fluoride according to the mass ratio of 1: 1; the covering agent is a mixture of charcoal and glass according to the mass ratio of 1:1, 30kg of the covering agent is added for the first time, and the covering agent is continuously consumed in the subsequent production process and needs to be continuously supplemented;

s2-2: first melting

Heating for melting, specifically: when the cold furnace is started, the front furnace is firstly melted, when the Cu element raw material begins to melt, the Mn element raw material is added into the front furnace, and when the front furnace begins to melt, the two rear furnaces begin to heat; and in the process of heating and melting, inert gas is used for protection at the furnace mouth; wherein, the inert gas is argon gas; during smelting, sampling and detecting Mn content by using a crucible, and adjusting the components of the melt until the Mn content reaches a target value;

s2-3: refining degassing

Degassing is started when the temperature rises to 1180 ℃, and the process sequentially comprises the following steps: argon degassing and CuMg alloy deoxidation; then adding a copper-silicon intermediate alloy and adjusting to a silicon content target value; the argon degassing specifically comprises: introducing argon into molten copper by using a graphite rod, and keeping for 25-30 min; the CuMg alloy deoxidation method specifically comprises the following steps: directly adding 0.1 percent of copper-magnesium alloy into the molten alloy melt according to the mass percentage;

s2-4: casting

Keeping the temperature unchanged when the temperature of the front furnace rises to 1230-1280 ℃, and starting casting;

s2-5: casting of

Ensuring the completion of smelting, refining and degassing in two rear furnaces within 10-15 min after casting; starting to dump one of the rear furnaces towards the front furnace, starting the wire feeding machine when the rear furnace begins to dump, and starting to feed wires towards the front furnace; sampling every 20min to detect components, and adjusting the wire feeding speed in time when the component content is not appropriate; wherein, the wire feeding speed is casting speed and casting blank diameter target component content/wire material diameter/intermediate alloy component/yield;

s2-6: cooling of casting blank

The temperature of the casting blank is 25-32 ℃ by utilizing a crystallizer, and the flow rate is 3m³Cooling the casting blank pulled out after solidification at the position 100mm away from the crystallizer for the first time by cooling water for the first time in a water mist spraying mode;

s3: continuous casting

After one of the rear furnaces is completely dumped, the other rear furnace is dumped; the poured rear furnace is subjected to the steps of material melting, refining degassing and casting, and then the poured rear furnace is further replaced to be poured into the front furnace; the two rear furnaces are alternately operated all the time, wherein when one rear furnace is dumped, the other rear furnace starts to melt materials.

The S2-2 and S3 melting materials are all carried out in a step-type heating mode, and the method specifically comprises the following steps: starting heat preservation when the temperature is raised to 300 ℃, wherein the heat preservation time is 30min, and carrying out heat preservation treatment at the temperature raising stage of 100 ℃ until the materials are melted; namely, the temperature is increased to 300 ℃ and is preserved for 30min, then the temperature is increased to 400 ℃ and is preserved for 30min, then the temperature is increased to 500 ℃ and is preserved for 30min, then the temperature is increased to 600 ℃ and is preserved for 30min, and the temperature is gradually and sequentially increased until the materials are melted.

Example 2:

the difference from example 1 is: s2-2 and S3 melting materials are carried out in a step-type heating mode, and the method specifically comprises the following steps: and starting heat preservation when the temperature is raised to 300 ℃, wherein the heat preservation time is 40min, and carrying out heat preservation treatment at the temperature raising stage of 105 ℃ until the materials are melted.

Example 3:

the difference from example 1 is: s2-2 and S3 melting materials are carried out in a step-type heating mode, and the method specifically comprises the following steps: and starting heat preservation when the temperature is raised to 300 ℃, wherein the heat preservation time is 45min, and carrying out heat preservation treatment at the temperature raising stage of 110 ℃ until the materials are melted.

Application example:

the continuous casting specification, the speed and the wire feeding speed of the copper-manganese alloy prepared by using the 8 different copper-manganese alloy slab ingots produced by the method of example 1 are shown in table 1, and the components of the 8 different copper-manganese alloy slab ingots prepared by the method are shown in table 2.

Table 1: continuous casting specification, speed and wire feeding speed of 8 different copper-manganese alloys

Table 2: produced 8 different copper-manganese alloy slab ingot components

Composition of casting blank	Cu	Mn	Si	Impurities	O
						Implement one	96.831	3.05	0.102	0.015	0.0005
Carry out two	96.865	3.02	0.099	0.013	0.0008
						Implementation III	97.126	2.81	0.049	0.012	0.0005
Practice four	97.111	2.82	0.055	0.013	0.0004
						Practice five	90.247	8.51	1.22	0.021	0.0006
EXAMPLE VI	90.244	8.48	1.25	0.024	0.0007
						Practice seven	89.435	9.05	1.48	0.033	0.0008
Practice eight	89.413	9.01	1.54	0.035	0.0005

The chemical components of the produced 8 different copper-manganese alloy ingots are uniform and consistent, and the impurity content is less than or equal to 0.1 wt%; the surface is smooth, and has no defects of accumulated tumors, inclusion (slag), cold shut, scab, cracks, edge cracks and the like, and the internal structure of the cast ingot is compact and has no defects of pores, inclusion, looseness, shrinkage cavity, segregation, internal cracks and the like.