CN107790969B - Preparation method of copper alloy thin-wall pipe fitting - Google Patents

Preparation method of copper alloy thin-wall pipe fitting Download PDF

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CN107790969B
CN107790969B CN201710925995.6A CN201710925995A CN107790969B CN 107790969 B CN107790969 B CN 107790969B CN 201710925995 A CN201710925995 A CN 201710925995A CN 107790969 B CN107790969 B CN 107790969B
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copper alloy
alloy thin
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pipe fitting
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CN107790969A (en
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岑攀益
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Ningbo Friendship Copper Industry Co Ltd
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Ningbo Friendship Copper Industry Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass

Abstract

the invention discloses a preparation method of a copper alloy thin-wall pipe fitting, which comprises the following steps: the method comprises the following steps of feeding inspection, slitting, molding, hot stamping, shot blasting, annealing, finish machining, cleaning and drying, wherein the copper alloy comprises the following raw materials in percentage by weight: cu: 75.0 to 77.0%, Si: 2.7-3.5%, P: 0.02-0.1%, Fe is less than or equal to 0.3%, Sn is less than or equal to 0.3%, Ni is less than or equal to 0.2%, Pb is less than or equal to 0.1%, Al is less than or equal to 0.05%, Mn is less than or equal to 0.05%, and the balance of Zn and inevitable impurities. The invention adopts the copper alloy raw material with extremely high copper content, so that the copper alloy thin-wall pipe fitting has better characteristics, and can be used for manufacturing products with the wall thickness of 0.9mm, thereby meeting the high standard requirements of various customers.

Description

Preparation method of copper alloy thin-wall pipe fitting
Technical Field
The invention relates to a preparation method of a copper alloy thin-wall pipe fitting, in particular to a preparation method of a copper alloy thin-wall pipe fitting applied to wall-mounted furnaces, aluminum plastic pipe pipelines and other water heating pipe fittings.
Background
the copper-zinc alloy is a memory alloy. Golden, gold-like color, commonly known as brass. The components of the copper-zinc memory alloy are more than dozens, and the copper-zinc memory alloy which can be used generally comprises the following main components: copper 64% zinc 18% nickel 18% or a copper zinc aluminum memory alloy. The martensitic transformation temperature is approximately around 100 ℃. The density was 6.75g/cm 3. It features high density, easy filling, good heat-conducting performance and different oxidizing tendency. The casting tin bronze has wide crystallization temperature range, is easy to generate shrinkage porosity defects, and is not strongly oxidized.
the connecting copper pipe fittings of the water heating pipeline are generally made of copper-zinc alloy, and the water temperature in the water heating pipeline changes greatly, so that the requirements on heat conductivity, tensile strength, yield strength and the like of the pipe fittings are high. Especially, the turning joint of the pipeline is additionally subjected to the impact force of water flow, and higher requirements are placed on various indexes. The aluminum-plastic pipe is a popular water heating pipe in the market, and is light in weight, durable and convenient to construct, and the flexibility of the aluminum-plastic pipe is more suitable for being used in home decoration. The common copper-zinc alloy pipe fitting can not meet the requirement of the aluminum-plastic pipe for pipeline connection, so that the actual use effect is reduced.
due to the limitation of the characteristics and the processing technology of the most common six-four brass in the market, the requirements of various indexes are often met in a stockpiling mode, so that the wall thickness of the pipe fitting is increased, the processing difficulty is increased, the difficulty in transportation and installation is increased, the cost is greatly increased, and the thin-wall pipe fitting which is satisfactory to customers cannot be manufactured.
disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a preparation method of a copper alloy thin-wall pipe fitting.
The technical scheme for solving the technical problem is as follows: a preparation method of a copper alloy thin-wall pipe fitting comprises the following steps:
(1) and (3) feeding inspection: randomly sampling the copper alloy raw material of each batch, and testing the chemical element composition ratio in the copper alloy raw material sample by adopting a 3V spectrometer;
(2) Slitting: cutting the raw material into a section of blank by adopting a cutting device;
(3) Molding: preparing a corresponding red punching die according to the size requirement of the thin-wall pipe fitting;
(4) red punching: heating the red punching die in the step (3) to 300-400 ℃, wiping a proper amount of lubricating oil in an upper die core and a lower die core of the red punching die, heating the blank in the step (2) to 750-800 ℃, putting the heated blank into the red punching die, starting red punching equipment to forge and press the blank, then opening the die and taking out a blank of the copper alloy thin-wall pipe fitting;
(5) shot blasting: placing the blank piece of the copper alloy thin-wall pipe fitting subjected to red punching in the step (4) on a loading table of shot blasting equipment for shot blasting treatment, wherein the loading table rotates at a constant speed of 6rad/min, the spraying angle of the shot blasting equipment constantly changes between 40 and 70 degrees, the spraying pressure is 0.2MPa, the diameter of iron sand is 0.3-0.5 mm, and the shot blasting time is 10-20 min;
(6) Annealing: placing the blank of the copper alloy thin-wall pipe fitting subjected to shot blasting treatment in the step (5) into an electric heating constant-temperature gulf-air drying box with a stainless steel liner, annealing at 530-700 ℃, keeping the annealing temperature for 1-3 h at constant temperature, and then naturally cooling;
(7) Finish machining: compiling a numerical control program according to the size requirement of the product, inputting the numerical control program into a system of a full-automatic high-precision numerical control lathe, then loading the blank of the copper alloy thin-wall pipe fitting subjected to annealing treatment in the step (6) into the numerical control lathe, turning, and taking out the qualified copper alloy thin-wall pipe fitting;
(8) Cleaning: placing the copper alloy thin-wall pipe subjected to machining after finish machining in the step (7) into an ultrasonic cleaning machine, firstly removing residues on the copper alloy thin-wall pipe by using a pneumatic cleaning gun, then sequentially placing the copper alloy thin-wall pipe into a first washing tank of the ultrasonic cleaning machine for washing for a long time of 10s, washing for a long time of 10-15 s in a pickling tank, washing for a long time of 10s in a second washing tank, washing for a long time of 1-3 min in a pre-film tank, and finally washing for a long time of 10s in a third washing tank;
Distilled water is injected into the first rinsing bath, the second rinsing bath and the third rinsing bath, and the liquid temperature is kept to be the same as the room temperature; injecting a pickling agent into the pickling tank, and keeping the liquid temperature at 55-65 ℃; injecting an antioxidant into the pre-filming groove, and keeping the liquid temperature at 20-35 ℃;
(9) and (3) drying: putting the copper alloy thin-wall pipe fitting subjected to cleaning treatment in the step (8) into an industrial dryer, keeping the drying temperature at 85-95 ℃, and performing drying treatment for 1-2 min to obtain a finished copper alloy thin-wall pipe fitting;
the copper alloy comprises the following raw materials in percentage by weight: cu: 75.0 to 77.0%, Si: 2.7-3.5%, P: 0.02-0.1%, Fe is less than or equal to 0.3%, Sn is less than or equal to 0.3%, Ni is less than or equal to 0.2%, Pb is less than or equal to 0.1%, Al is less than or equal to 0.05%, Mn is less than or equal to 0.05%, and the balance of Zn and inevitable impurities.
further, the density of the copper alloy raw material is 8.25g/cm for high yield and high yield, and the elastic modulus is more than or equal to 85 KN/mm.
Furthermore, the copper alloy thin-wall pipe prepared by the preparation method of the copper alloy thin-wall pipe has the wall thickness of more than or equal to 0.9mm, the hardness of less than or equal to 200HB, the tensile strength of 530-700 MPa, the yield strength of 300-450 MPa, the electric conductivity of more than or equal to 7.8% IACS, and the thermal conductivity of more than or equal to 33W/M.K.
the invention has the beneficial effects that: 1. the copper alloy raw material with extremely high copper content is adopted, so that the copper alloy thin-wall pipe fitting has better characteristics, and a product with the wall thickness of 0.9mm can be manufactured, and the high-standard requirements of various customers are met; 2. a special red punching process is adopted, and the red punching temperature is increased from original 680-700 ℃ to 750-800 ℃ so as to meet the processing process requirement of the copper alloy; 3. the qualification rate and the production efficiency of the red punching product are effectively improved by preheating the red punching die; 4. the surface layer of the part is subjected to plastic deformation through a special shot blasting process to form a strengthening layer with a certain thickness, and a higher residual stress is formed in the strengthening layer, so that the fatigue of the part is reduced, and the service life of the product is prolonged; 5. the special ultrasonic cleaning process is adopted, and the oxide skin and rusty materials on the surface can be removed through five procedures, so that the parts of the product are thoroughly cleaned, and the oxidation resistance of the product is improved.
Detailed Description
the present invention will be described in further detail with reference to specific embodiments.
A preparation method of a copper alloy thin-wall pipe fitting comprises the following steps:
the method comprises the following steps of feeding inspection, slitting, molding, red punching, shot blasting, annealing, finish machining, cleaning and drying.
The method comprises the following specific steps:
(1) and (3) feeding inspection: randomly sampling the copper alloy raw material of each batch, testing the chemical element composition ratio in the copper alloy raw material sample by adopting a 3V spectrometer, and specifically testing according to the following standards: the copper alloy comprises the following raw materials in percentage by weight: cu: 75.0 to 77.0%, Si: 2.7-3.5%, P: 0.02-0.1%, Fe is less than or equal to 0.3%, Sn is less than or equal to 0.3%, Ni is less than or equal to 0.2%, Pb is less than or equal to 0.1%, Al is less than or equal to 0.05%, Mn is less than or equal to 0.05%, and the balance of Zn and inevitable impurities;
(2) Slitting: cutting the raw material into a section of blank by adopting a cutting device;
(3) Molding: preparing a corresponding red punching die according to the size requirement of the thin-wall pipe fitting;
(4) Red punching: heating the red punching die in the step (3) to 300-400 ℃, wiping a proper amount of lubricating oil in an upper die core and a lower die core of the red punching die, heating the blank in the step (2) to 750-800 ℃, putting the heated blank into the red punching die, starting red punching equipment to forge and press the blank, then opening the die and taking out a blank of the copper alloy thin-wall pipe fitting;
(5) Shot blasting: placing the blank piece of the copper alloy thin-wall pipe fitting subjected to red punching in the step (4) on a loading table of shot blasting equipment for shot blasting treatment, wherein the loading table rotates at a constant speed of 6rad/min, the spraying angle of the shot blasting equipment constantly changes between 40 and 70 degrees, the spraying pressure is 0.2MPa, the diameter of iron sand is 0.3-0.5 mm, and the shot blasting time is 10-20 min;
(6) annealing: placing the blank of the copper alloy thin-wall pipe fitting subjected to shot blasting treatment in the step (5) into an electric heating constant-temperature gulf-air drying box with a stainless steel liner, annealing at 530-700 ℃, keeping the annealing temperature for 1-3 h at constant temperature, and then naturally cooling;
(7) Finish machining: compiling a numerical control program according to the size requirement of the product, inputting the numerical control program into a system of a full-automatic high-precision numerical control lathe, then loading the blank of the copper alloy thin-wall pipe fitting subjected to annealing treatment in the step (6) into the numerical control lathe, turning, and taking out the qualified copper alloy thin-wall pipe fitting;
(8) cleaning: placing the copper alloy thin-wall pipe subjected to machining after finish machining in the step (7) into an ultrasonic cleaning machine, firstly removing residues on the copper alloy thin-wall pipe by using a pneumatic cleaning gun, then sequentially placing the copper alloy thin-wall pipe into a first washing tank of the ultrasonic cleaning machine for washing for a long time of 10s, washing for a long time of 10-15 s in a pickling tank, washing for a long time of 10s in a second washing tank, washing for a long time of 1-3 min in a pre-film tank, and finally washing for a long time of 10s in a third washing tank;
Distilled water is injected into the first rinsing bath, the second rinsing bath and the third rinsing bath, and the liquid temperature is kept to be the same as the room temperature; injecting a pickling agent into the pickling tank, and keeping the liquid temperature at 55-65 ℃; injecting an antioxidant into the pre-filming groove, and keeping the liquid temperature at 20-35 ℃;
(9) and (3) drying: and (4) putting the copper alloy thin-wall pipe fitting subjected to cleaning treatment in the step (8) into an industrial dryer, keeping the drying temperature of 85-95 ℃, and carrying out drying treatment for 1-2 min to obtain a finished copper alloy thin-wall pipe fitting.
performance testing and analysis
example 1 was tested for performance by techniques well known in the art and the test structure was analyzed to conclude the following:
the density of the copper alloy raw material is 8.25g/cm for carrying out high-speed cultivation, and the elastic modulus is more than or equal to 85 KN/mm;
the copper alloy thin-wall pipe prepared by the preparation method of the copper alloy thin-wall pipe has the wall thickness of more than or equal to 0.9mm, the hardness of less than or equal to 200HB, the tensile strength of 530-700 MPa, the yield strength of 300-450 MPa, the electric conductivity of more than or equal to 7.8% IACS, and the heat conductivity of more than or equal to 33W/M.K.
the above examples are only for illustrating the inventive concept of the present invention, and are not to be construed as limiting the claims of the present invention, and any insubstantial modifications of the invention using the inventive concept shall fall within the scope of the present invention.

Claims (3)

1. the preparation method of the copper alloy thin-wall pipe fitting is characterized by comprising the following steps:
(1) and (3) feeding inspection: randomly sampling the copper alloy raw material of each batch, and testing the chemical element composition ratio in the copper alloy raw material sample by adopting a 3V spectrometer;
(2) slitting: cutting the raw material into a section of blank by adopting a cutting device;
(3) Molding: preparing a corresponding red punching die according to the size requirement of the thin-wall pipe fitting;
(4) Red punching: heating the red punching die in the step (3) to 300-400 ℃, wiping a proper amount of lubricating oil in an upper die core and a lower die core of the red punching die, heating the blank in the step (2) to 750-800 ℃, putting the heated blank into the red punching die, starting red punching equipment to forge and press the blank, then opening the die and taking out a blank of the copper alloy thin-wall pipe fitting;
(5) shot blasting: placing the blank piece of the copper alloy thin-wall pipe fitting subjected to red punching in the step (4) on a loading table of shot blasting equipment for shot blasting treatment, wherein the loading table rotates at a constant speed of 6rad/min, the spraying angle of the shot blasting equipment constantly changes between 40 and 70 degrees, the spraying pressure is 0.2MPa, the diameter of iron sand is 0.3-0.5 mm, and the shot blasting time is 10-20 min;
(6) annealing: placing the blank of the copper alloy thin-wall pipe fitting subjected to shot blasting treatment in the step (5) into an electric heating constant-temperature gulf-air drying box with a stainless steel liner, annealing at 530-700 ℃, keeping the annealing temperature for 1-3 h at constant temperature, and then naturally cooling;
(7) finish machining: compiling a numerical control program according to the size requirement of the product, inputting the numerical control program into a system of a full-automatic high-precision numerical control lathe, then loading the blank of the copper alloy thin-wall pipe fitting subjected to annealing treatment in the step (6) into the numerical control lathe, turning, and taking out the qualified copper alloy thin-wall pipe fitting;
(8) cleaning: placing the copper alloy thin-wall pipe subjected to machining after finish machining in the step (7) into an ultrasonic cleaning machine, firstly removing residues on the copper alloy thin-wall pipe by using a pneumatic cleaning gun, then sequentially placing the copper alloy thin-wall pipe into a first washing tank of the ultrasonic cleaning machine for washing for a long time of 10s, washing for a long time of 10-15 s in a pickling tank, washing for a long time of 10s in a second washing tank, washing for a long time of 1-3 min in a pre-film tank, and finally washing for a long time of 10s in a third washing tank;
distilled water is injected into the first rinsing bath, the second rinsing bath and the third rinsing bath, and the liquid temperature is kept to be the same as the room temperature; injecting a pickling agent into the pickling tank, and keeping the liquid temperature at 55-65 ℃; injecting an antioxidant into the pre-filming groove, and keeping the liquid temperature at 20-35 ℃;
(9) and (3) drying: putting the copper alloy thin-wall pipe fitting subjected to cleaning treatment in the step (8) into an industrial dryer, keeping the drying temperature at 85-95 ℃, and performing drying treatment for 1-2 min to obtain a finished copper alloy thin-wall pipe fitting;
The copper alloy comprises the following raw materials in percentage by weight: cu: 75.0 to 77.0%, Si: 2.7-3.5%, P: 0.02-0.1%, Fe is less than or equal to 0.3%, Sn is less than or equal to 0.3%, Ni is less than or equal to 0.2%, Pb is less than or equal to 0.1%, Al is less than or equal to 0.05%, Mn is less than or equal to 0.05%, and the balance of Zn and inevitable impurities.
2. the method for preparing the copper alloy thin-wall pipe fitting according to claim 1, wherein the method comprises the following steps: the density of the copper alloy raw material is 8.25g/cm for high-speed cultivation, and the elastic modulus is more than or equal to 85 KN/mm.
3. the method for preparing the copper alloy thin-wall pipe fitting according to claim 1, wherein the method comprises the following steps: the copper alloy thin-wall pipe prepared by the preparation method of the copper alloy thin-wall pipe has the wall thickness of more than or equal to 0.9mm, the hardness of less than or equal to 200HB, the tensile strength of 530-700 MPa, the yield strength of 300-450 MPa, the electric conductivity of more than or equal to 7.8% IACS, and the heat conductivity of more than or equal to 33W/M.K.
CN201710925995.6A 2017-10-06 2017-10-06 Preparation method of copper alloy thin-wall pipe fitting Active CN107790969B (en)

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EP1944563A1 (en) * 2007-01-12 2008-07-16 Innospin AG Heat exchanger tube and method for the production thereof
CN102310310B (en) * 2010-07-08 2015-03-11 襄阳汽车轴承股份有限公司 Composite machining process for inner and outer rings of narrow-series thin-walled high-precision conical thin-walled bearings
CN102191403B (en) * 2011-04-25 2012-10-31 富阳丰源铜业有限公司 Pressure gauge copper connector obtained by adopting hot pressing process and production method thereof
CN102294579B (en) * 2011-08-29 2013-01-23 西部钛业有限责任公司 Method for manufacturing thin-wall and ultra-long nickel-copper alloy pipes
CN103484712B (en) * 2012-12-17 2016-05-04 阮伟光 Containing bismuth-brass alloy drawn tube and the manufacture method thereof of trace rare-earth
CN103831597B (en) * 2014-04-01 2017-02-08 台州市中奥特种设备检测技术服务有限公司 Copper alloy valve forging production processing technique
CN105327970A (en) * 2015-12-03 2016-02-17 应敏燕 Red punching forming process for three-way pipe joint

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