CN104651766B - A kind of preparation method of instrument copper pipe - Google Patents
A kind of preparation method of instrument copper pipe Download PDFInfo
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- CN104651766B CN104651766B CN201510064164.5A CN201510064164A CN104651766B CN 104651766 B CN104651766 B CN 104651766B CN 201510064164 A CN201510064164 A CN 201510064164A CN 104651766 B CN104651766 B CN 104651766B
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Abstract
The invention discloses a kind of preparation method of instrument copper pipe, comprise the following steps：(a) melting raw material；(b) horizontal casting；(c) milling face is detected a flaw；(d) two roller periodics are cold rolling；(e) it is cold drawn；(f) anneal；(g) clean；(h) packaging and storage is checked.The preparation method of the instrument copper pipe of the present invention, due to not using pressing steps, therefore the comprehensive utilization ratio of material is high, saves cost, energy consumption is reduced, while shortening process time；There is no pressing steps, improve production efficiency.
Description
Technical Field
The invention belongs to the technical field of nonferrous metal processing, and particularly relates to a preparation method of a copper pipe for an instrument.
Background
With the rise of processing and manufacturing industries, the problems of environmental pollution and resource shortage are increasingly highlighted, and therefore, for the production and manufacturing industries, the production of low-energy consumption and high-quality products becomes a goal pursued by each manufacturer. The traditional copper pipe production process comprises the following steps: the method comprises the steps of proportioning, smelting, converter, casting, extruding, pipe rolling, stretching, heat treatment, finishing and inspection and warehousing, but the copper pipe produced by the process has the advantages of low utilization rate of materials, high energy consumption, long process flow and low production efficiency.
Disclosure of Invention
The invention aims to provide an efficient copper pipe preparation method aiming at the defects of the prior art, and the method has the advantages of no need of an extrusion step, low energy consumption and high production efficiency.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for preparing a copper tube for an instrument comprises the following steps:
(a) smelting raw materials;
(b) horizontal continuous casting;
(c) milling a surface and detecting flaws;
(d) performing two-roller periodic cold rolling;
(e) cold drawing;
(f) annealing;
(g) cleaning;
(h) and (6) checking, packaging and warehousing.
Further, the copper pipe is a brass pipe, and is specifically one of H62, H65, H68 or HAl 77-2.
Further, the horizontal continuous casting is multi-strand horizontal continuous casting, and specifically comprises the following steps:
(1) drying the brass alloy or the raw materials thereof, heating the brass alloy or the raw materials in a smelting furnace at 1050-1100 ℃, and covering charcoal on the surface after the raw materials are melted;
(2) transferring the melted alloy liquid into a holding furnace for heat preservation;
(3) and cooling and drawing the blank, wherein the drawing speed is 300-400 mm/min.
Further, secondary water cooling is adopted for cooling the casting blank, the pressure of primary cooling water is 0.13MPa, and the pressure of secondary cooling water is 0.03 MPa.
Furthermore, the smelting furnace and the holding furnace are of a sealing structure, the middle of the smelting furnace and the holding furnace are connected through a channel, and a device for controlling the opening and closing of the channel is arranged in the channel.
Furthermore, rare earth elements are also added into the alloy liquid in the heat preservation furnace, the content of the rare earth elements is 10 wt%, and the adding amount is 0.06% of the mass of the melt.
Further, the rare earth element is cerium or lanthanum.
Further, the step of cooling and drawing blank is also provided with an electromagnetic disturbance step.
Further, the annealing temperature is 700-750 ℃, and the annealing time is 10-20 min.
Further, the annealing step is replaced with a pulsed current.
The invention has the beneficial effects that: because the extrusion step is not adopted, the comprehensive utilization rate of the material is high, the cost is saved, the energy consumption is reduced, and the processing time is shortened; and no extrusion step is required, so that the production efficiency is improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A method for preparing a copper tube for an instrument comprises the following steps:
(a) drying an H62 type copper raw material, placing the dried raw material in a smelting furnace, setting the smelting temperature at 1050 ℃, and covering charcoal on the surface after the raw material is molten;
(b) a channel between the smelting furnace and the holding furnace is opened, and the melted alloy liquid flows into the holding furnace from the smelting furnace;
(c) adding rare earth element cerium into the alloy, wherein the content of rare earth is 10 wt%, and the addition amount is 0.06% of the mass of the melt;
(d) cooling and throwing, wherein secondary water cooling is adopted during cooling, the pressure of primary cooling water is 0.13MPa, the pressure of secondary cooling water is 0.03MPa, the throwing speed is 300mm/min, and electromagnetic stirring is carried out while cooling;
(e) performing face milling flaw detection on the drawn copper pipe blank, wherein a double-face milling mode can be adopted;
(f) feeding the blank into a rolling mill, wherein the used rollers are two rollers, and rolling the blank in a periodic rolling mode;
(g) stretching the rolled copper pipe;
(h) annealing the stretched copper pipe, and specifically, putting the copper pipe at 700 ℃ for 10min to recrystallize;
(i) and (4) cleaning the copper pipe subjected to heat treatment by using low-concentration acid, inspecting, packaging and warehousing.
Because the method for preparing the copper tube for the instrument adopts cold rolling processing, the components and the production process of the material need to be strictly controlled and optimized in the smelting step in order to avoid the defects of cracks and the like in the cold deformation process.
The integrated smelting furnace and holding furnace are adopted in the steps, and the device has the advantages that the contact between the melt and air can be reduced, the loss of the melt in the circulation process is reduced, and the energy consumption is reduced. The channel between the smelting furnace and the heat preservation furnace is opened and closed by utilizing a fluid solidification and melting mode, and particularly, a heating and cooling device is arranged in the channel, when the channel is required to be opened, the heating device is opened to melt the solid at the position, the liquid in the smelting furnace flows into the heat preservation furnace under the action of gravity, and when the channel is required to be closed, the cooling device is opened to solidify the melt at the position and block the melt from continuously flowing into the heat preservation furnace.
When rare earth element cerium is added into alloy liquid during heat preservation, cerium and impurities in the melt can form a compound with light specific gravity to rise, so that the melt is purified, cerium can also form a high-melting-point compound in copper to form a dispersed crystal core, and therefore the effect of refining crystal grains is achieved, and the plasticity of the material is improved. And simultaneously, dezincification and intergranular corrosion can be inhibited. In the step of drawing the blank, a secondary water cooling mode is adopted for cooling, wherein the primary water cooling has the function of enabling the melt to form a solidified shell with a certain shape and thickness, the secondary water cooling has the function of further solidifying the melt which is not solidified inside, and in the cooling process, in order to prevent cracks, air holes, looseness and reverse segregation of the cast ingot, liquid cavities are kept flat as much as possible, so that the primary water cooling is weaker than the secondary water cooling.
The electromagnetic disturbance can make the melt generate electromagnetic force under the action of electromagnetic force, and the electromagnetic disturbance can stir the melt, break and re-melt some crystals, and refine grains.
Two-roller periodic cold rolling is adopted in the rolling process, so that the phenomenon that a large amount of heat is generated in the rolling process to cause brittle phases in the material is avoided.
Example 2
A method for preparing a copper tube for an instrument comprises the following steps:
(a) drying an H65 type copper raw material, placing the dried raw material in a smelting furnace, setting the smelting temperature at 1080 ℃, and covering charcoal on the surface after the raw material is molten;
(b) a channel between the smelting furnace and the holding furnace is opened, and the melted alloy liquid flows into the holding furnace from the smelting furnace;
(c) adding rare earth element cerium into the alloy, wherein the content of rare earth is 10 wt%, and the addition amount is 0.06% of the mass of the melt;
(d) cooling and throwing, wherein secondary water cooling is adopted during cooling, the pressure of primary cooling water is 0.13MPa, the pressure of secondary cooling water is 0.03MPa, the throwing speed is 350mm/min, and electromagnetic stirring is carried out while cooling;
(e) performing face milling flaw detection on the drawn copper pipe blank, wherein a double-face milling mode can be adopted;
(f) feeding the blank into a rolling mill, wherein the used rollers are two rollers, and rolling the blank in a periodic rolling mode;
(g) stretching the rolled copper pipe;
(h) annealing the stretched copper pipe, and specifically, putting the copper pipe at 720 ℃ for heat preservation for 15min to recrystallize the copper pipe;
(i) and (4) cleaning the copper pipe subjected to heat treatment by using low-concentration acid, inspecting, packaging and warehousing.
Example 3
A method for preparing a copper tube for an instrument comprises the following steps:
(a) drying the HAl77-2 type copper raw material, placing the dried raw material in a smelting furnace, setting the smelting temperature at 1100 ℃, and covering charcoal on the surface after the raw material is molten;
(b) a channel between the smelting furnace and the holding furnace is opened, and the melted alloy liquid flows into the holding furnace from the smelting furnace;
(c) adding rare earth element lanthanum into the alloy, wherein the content of rare earth is 10 wt%, and the addition amount is 0.06% of the mass of the melt;
(d) cooling and throwing, wherein secondary water cooling is adopted during cooling, the pressure of primary cooling water is 0.13MPa, the pressure of secondary cooling water is 0.03MPa, the throwing speed is 400mm/min, and electromagnetic stirring is carried out while cooling;
(e) performing face milling flaw detection on the drawn copper pipe blank, wherein a double-face milling mode can be adopted;
(f) feeding the blank into a rolling mill, wherein the used rollers are two rollers, and rolling the blank in a periodic rolling mode;
(g) stretching the rolled copper pipe;
(h) treating the stretched copper tube by using pulse current, wherein the discharge period is 130 mu s, and the maximum discharge current is 20kA/mm2The duration is 1 ms;
(i) and (4) cleaning the treated copper pipe by using low-concentration acid, inspecting, packaging and warehousing.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; it is intended that the following claims be interpreted as including all such alterations, modifications, and equivalents as fall within the true spirit and scope of the invention.
Claims (5)
1. A method for preparing a copper tube for an instrument is characterized by comprising the following steps:
(a) smelting raw materials;
(b) horizontal continuous casting;
(c) milling a surface and detecting flaws;
(d) performing two-roller periodic cold rolling;
(e) cold drawing;
(f) annealing;
(g) cleaning;
(h) checking, packaging and warehousing; wherein,
the copper pipe is a brass pipe;
the annealing temperature is 700-750 ℃, and the annealing time is 10-20 min;
the horizontal continuous casting is multi-stream horizontal continuous casting, and specifically comprises the following steps:
(1) drying the brass alloy or the raw materials thereof, heating the brass alloy or the raw materials in a smelting furnace at 1050-1100 ℃, and covering charcoal on the surface after the raw materials are melted;
(2) transferring the melted alloy liquid into a holding furnace for heat preservation;
(3) and cooling and drawing the blank, wherein the drawing speed is 300-400 mm/min, secondary water cooling is adopted for cooling the blank, the pressure of primary cooling water is 0.13MPa, and the pressure of secondary cooling water is 0.03 MPa.
2. A method of manufacturing a copper tube for meters as claimed in claim 1 wherein the brass tube is one of H62, H65, H68 or hai 77-2.
3. The method for manufacturing a copper tube for instruments according to claim 2, wherein the melting furnace and the holding furnace are sealed and connected by a passage, and a device for controlling the opening and closing of the passage is provided in the passage.
4. A method for manufacturing a copper tube for meters as claimed in claim 2, wherein said step of cold drawing is further provided with a step of electromagnetic disturbance.
5. A method of manufacturing a copper tube for meters as claimed in claim 1 wherein said annealing step is replaced by a pulsed current.
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Effective date of registration: 20221222 Address after: No. 1, Xinhu Shuanghu Road, Shuangfeng Town, Taicang City, Suzhou City, Jiangsu Province, 215000 Patentee after: Suzhou Meixiangcai Technology Co.,Ltd. Address before: No. 1, Shuanghu Road, Shuangfeng Town, Taicang City, Suzhou City, Jiangsu Province, 215416 Patentee before: SUZHOU FURUI COPPER ALLOY TECHNOLOGY CO.,LTD. |