CN110497321B - Method for treating oxide skin on inner surface and outer surface of extruded cupronickel tube bar - Google Patents
Method for treating oxide skin on inner surface and outer surface of extruded cupronickel tube bar Download PDFInfo
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- CN110497321B CN110497321B CN201910760540.2A CN201910760540A CN110497321B CN 110497321 B CN110497321 B CN 110497321B CN 201910760540 A CN201910760540 A CN 201910760540A CN 110497321 B CN110497321 B CN 110497321B
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- shot blasting
- white copper
- tube bar
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- bar
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- 229910000570 Cupronickel Inorganic materials 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000004576 sand Substances 0.000 claims abstract description 65
- 238000005422 blasting Methods 0.000 claims abstract description 61
- 239000010935 stainless steel Substances 0.000 claims abstract description 36
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 27
- 238000004140 cleaning Methods 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 9
- 239000000428 dust Substances 0.000 claims description 51
- 239000000203 mixture Substances 0.000 claims description 24
- 238000000926 separation method Methods 0.000 claims description 9
- 238000004064 recycling Methods 0.000 claims description 7
- 239000002699 waste material Substances 0.000 claims description 7
- 244000035744 Hura crepitans Species 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 239000006187 pill Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 238000005488 sandblasting Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 abstract description 13
- 238000005554 pickling Methods 0.000 abstract description 11
- 229910052751 metal Inorganic materials 0.000 abstract description 8
- 239000002184 metal Substances 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000013535 sea water Substances 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 2
- 239000005751 Copper oxide Substances 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910000431 copper oxide Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 241000255969 Pieris brassicae Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
- BERDEBHAJNAUOM-UHFFFAOYSA-N copper(I) oxide Inorganic materials [Cu]O[Cu] BERDEBHAJNAUOM-UHFFFAOYSA-N 0.000 description 1
- LDSIKPHVUGHOOI-UHFFFAOYSA-N copper;oxonickel Chemical compound [Ni].[Cu]=O LDSIKPHVUGHOOI-UHFFFAOYSA-N 0.000 description 1
- KRFJLUBVMFXRPN-UHFFFAOYSA-N cuprous oxide Chemical compound [O-2].[Cu+].[Cu+] KRFJLUBVMFXRPN-UHFFFAOYSA-N 0.000 description 1
- 229940112669 cuprous oxide Drugs 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
- B24C1/086—Descaling; Removing coating films
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A method for treating oxide skins on the inner and outer surfaces of an extruded cupronickel tube bar sequentially comprises the following process flows: sawing, straightening, feeding, stirring to a roller shaft conveyor, performing shot blasting on the outer wall, stirring to a buffer frame, performing shot blasting on the inner surface, withdrawing and cleaning an inner wall sand blaster, discharging and blowing for cleaning; the outer surface of the cupronickel tube bar is beaten by high frequency from high speed stainless steel shots in each direction in the shot blasting chamber to remove oxide skin, when a nozzle of an inner wall sand blaster enters the cupronickel tube bar, high pressure gas pushes the stainless steel shots to be sprayed out from each direction by the nozzle, and the inner surface of the cupronickel tube bar is beaten by high frequency from the high speed stainless steel shots in each direction to remove the oxide skin, so that the method is environment-friendly and pollution-free compared with the chemical method for treating the oxide skin by acid pickling; the consumption of metal is small, the metal consumption is 0.8%, the consumption is far lower than that of an acid pickling method, media such as shot materials and the like can be repeatedly utilized, the consumption of the use cost is low, the surface color after shot blasting is uniform, no residue exists, and no influence is caused on the subsequent processing procedures.
Description
Technical Field
The invention belongs to the technical field of nonferrous metal processing, relates to a process for treating oxide skins on the inner and outer surfaces of an extruded cupronickel tube bar, and particularly relates to a method for treating the oxide skins on the inner and outer surfaces of the extruded cupronickel tube bar.
Background
The white copper tube bar alloy system is a copper-based alloy containing 0.6-30% of nickel, has good mechanical property and welding property, has seawater corrosion resistance second to noble metals, particularly has unique marine organism pollution resistance and excellent characteristics of insensitivity to stress corrosion, and is widely applied to the fields of marine ships, seashore power stations, offshore platforms, marine chemical industry and the like. Mainly comprises a seawater pipeline, an air cooler, a lubricating oil cooler, a seawater pump shell, an impeller and the like.
The processing technology for manufacturing the cupronickel tube bar comprises the steps of casting, extruding, rolling, stretching for multiple times and annealing, wherein an ingot casting in the extruding process adopts electric heating or annular natural gas heating, the heating temperature is 1030 ℃, the ingot casting is extruded after being heated, the surface of the cupronickel tube bar after being extruded is oxidized at high temperature to form a layer of compact black oxide skin, the oxide skin mainly comprises copper oxide, cuprous oxide and copper-nickel oxide, the oxide skin is attached to the surface of the cupronickel tube bar and must be removed before subsequent processing, the removing method is usually removed by a strong acid liquid soaking corrosion method, and the specific technology is as follows:
acid (18-20% of H2SO4, 7-10% of HNO3 and the balance of water to form mixed acid liquid), soaking for 20-30 minutes in hot water (60-70 ℃), soaking for 40-50 minutes in a mixed acid liquid tank, washing with cold water, washing with hot water, recycling and washing with water for two to three times.
At present, when the external diameter of the production of the white copper tube bar is less than 100mm at home and abroad, advanced enterprises adopt water seal extrusion, the white copper tube bar is not oxidized during the extrusion discharging, but the external diameter is greater than 100mm, because the external diameter is great, the extrusion water seal head of the large white copper tube bar cannot be sealed, and the design difficulty of a front beam of an oil press is large and the like, the copper processing industry adopts non-water seal extrusion when extruding the large-caliber white copper tube bar, the oxide skin on the surface of the extruded white copper tube bar is solved by an acid pickling method, but the surface oxide skin process of the acid pickling of the white copper tube bar has the following problems:
1. the environmental pollution is serious, the waste acid liquid treatment difficulty is large, and the environmental pollution is greatly harmed.
2. The pickling process has large metal loss, and the copper-nickel tube bar matrix itself is also lost while the acid and the copper oxide are subjected to chemical reaction.
3. Uneven pickling and surface acid residues occur, quality problems occur and risks exist for subsequent processing.
The modern industry of high efficiency, energy saving, green and environmental protection is built, the acid washing process of the oxide skin on the surface of the white copper tube bar must be eliminated, and the substitution of a new process method is trending.
In order to solve the defects and problems in the method, a method for treating oxide skins on the inner surface and the outer surface of the extruded cupronickel tube bar is provided.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the method for treating the oxide scale on the inner surface and the outer surface of the extruded cupronickel tube bar, which is environment-friendly and pollution-free compared with the method for treating the oxide scale by a chemical pickling method; the consumption of metal is small, the method only cleans the oxide skin of the surface layer, and the metal consumption is 0.8 percent and is far lower than that of the pickling method. The medium such as the pill material can be repeatedly utilized, and the use cost and the consumption are low. The surface after shot blasting has uniform color and no residue, and has no influence on subsequent processing procedures. Has a certain effect of eliminating the residual stress of the processing of the white copper pipe bar.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for treating oxide skins on the inner and outer surfaces of an extruded cupronickel tube bar sequentially comprises the following process flows: sawing, straightening, feeding, stirring to a roller shaft conveyor, performing shot blasting on the outer wall, stirring to a buffer frame, performing shot blasting on the inner surface, withdrawing and cleaning an inner wall sand blaster, discharging and blowing for cleaning;
step one, saw cutting and straightening: cutting and straightening the extruded cupronickel tube bar;
step two, feeding: the shot blasting machine is prepared and checked before shot blasting, the diameter of stainless steel shot materials in a sand box is 0.1-0.3mm, the total weight is 10-13 tons, and a circulating system, a recovery separation system and a dust removal system are required to be ensured to be capable of normally operating after comprehensive checking;
thirdly, material shifting to a roller shaft conveyor: placing the cut and straightened white copper tube bar on a rotary roller way of a roller shaft conveyor, wherein the white copper tube bar advances on the rotary roller way of the roller shaft conveyor in a rotary state, and the conveying speed of the roller shaft conveyor is 0.5-1.2 m/min;
fourthly, shot blasting on the outer wall: the rotary roller way of the roller conveyer conveys the cupronickel tube bar forwards into a closed shot blasting chamber, the cupronickel tube bar in the shot blasting chamber is still in a rotary state on the rotary roller way and continuously moves forwards slowly, a plurality of groups of spray heads capable of spraying high-speed shot blasting are arranged at each part of the upper part and the lower part in the shot blasting chamber, two abrator machines are arranged above the top of the shot blasting chamber in parallel, the abrator machines drive an impeller body to rotate at high speed by a motor, the shot blasting is thrown to the outer surface of the cupronickel tube bar by the action of centrifugal force, the outer surface of the cupronickel tube bar is subjected to high-frequency shot blasting by high-speed stainless steel shots from each direction, when the cupronickel tube bar on the rotary roller way moves to be close to an outlet of the abrator, the abrator machines stop abrator blasting, at the moment, black oxide skins on the circumferential outer surface of the cupronickel tube bar are all removed, the impeller rotation speed of each abrator impeller is 2700-, the pill output is 210-230 kg/min.
Fifthly, material shifting to a buffer frame: the white copper tube bar material with the black oxide skin removed is continuously output to a shot blasting chamber to a buffer frame of an internal spraying station by a roller shaft conveyor, a mixture of shot materials and oxide skin dust in the shot blasting chamber falls into a lower hopper and enters a separator through a lifting machine to be separated from the oxide skin dust, the mixture of stainless steel shots, waste materials and oxide skin dust respectively falls into different channels according to different specific weights, pure and qualified stainless steel shots enter a hopper for use by the shot blasting machine, the unseparated mixture flows into the lifting machine to enter the separator again for re-separation, fine dust is sucked into a dust remover, granular dust is captured and collected, the separated stainless steel shots fall into a sand storage box for recycling, and the oxide skin dust enters the dust remover through a pipeline to be collected;
sixthly, inner surface shot blasting: fixing the white copper pipe bar on the buffer frame by using a fixture, driving an inner wall sand blower to approach the white copper pipe bar by a conveying trolley, wherein the inner wall sand blower is a hollow long rod, nozzles are uniformly distributed on the periphery of the discharge end of the inner wall sand blower, when the nozzles of the inner wall sand blower enter the white copper pipe bar along the axial line of the white copper pipe bar, a high-pressure gas is generated in the inner wall sand blower by an air compressor, stainless steel shots in a sand box flow into the inner wall sand blower, the high-pressure gas in the inner wall sand blower pushes the stainless steel shots in the inner wall sand blower to be sprayed out from the nozzles to all directions, the inner surface of the white copper pipe bar is subjected to high-frequency striking from the high-speed stainless steel shots from all directions, the feeding speed of the inner wall sand blower is 8-15 mm/s, the pressure of the air compressor matched with the inner wall sand blower is 0.6-0.7MPa, the flow is 10-13m3And the sand output is 25-35 kg/min, the inner wall sand blower retreats after sand blasting enters and exits the white copper tube bar twice, the inner wall sand blower enters the white copper tube bar in a sand-free state and cleans residual sand on the inner wall of the white copper tube bar through high-pressure gas, and oxide skin on the inner wall of the white copper tube bar is completely removed.
Seventhly, the inner wall sand blaster is withdrawn and cleaned: after the inner surface of the white copper pipe bar is shot-blasted, the inner wall sand blaster exits from the inside of the white copper pipe bar along the axial lead of the white copper pipe bar, the mixture of shot materials and oxide skin dust in the white copper pipe bar falls into a lower hopper, the mixture enters a separator through a lifting machine to separate the shot materials from the oxide skin dust, the mixture of stainless steel shots, waste materials and the oxide skin dust respectively fall into different channels according to different specific gravities of the mixture, pure and qualified stainless steel shots enter a hopper for use by a shot blasting machine, the unseparated mixture flows into the lifting machine to enter the separator again for re-separation, fine dust is sucked into a dust remover, granular dust is captured and collected, the separated stainless steel shots fall into a sand storage box for recycling, and the oxide skin dust enters the dust remover through a pipeline to be collected;
eighth step, unloading and blowing cleaning: and (4) stirring the white copper pipe bar to a discharging frame for discharging, and blowing air to clean the residual sand on the inner surface and the outer surface of the white copper pipe bar.
The invention has the beneficial effects that: the method for treating the surface oxide skin of the cupronickel tube bar is different from the chemical method treatment of acid pickling, and is a physical method for removing the oxide skin.
The method has the advantages that:
1. compared with the chemical method for pickling, the method for treating the oxide skin is environment-friendly and pollution-free;
2. the consumption of metal is small, the method only cleans the oxide skin of the surface layer, and the metal consumption is 0.8 percent and is far lower than that of the pickling method.
3. The medium such as the pill material can be repeatedly utilized, and the use cost and the consumption are low.
4. The surface after shot blasting has uniform color and no residue, and has no influence on subsequent processing procedures.
5. Has a certain effect of eliminating the residual stress of the processing of the white copper pipe bar.
6. The method can be popularized to the surface treatment process of other products by selecting the pills with different materials and diameters.
The inner surface shot blasting is a cleaning method taking compressed air as power, the compressed air pushes the shot materials at a high speed in the pipe to be sprayed to the surface of a workpiece to be processed, and the shot materials have impact and grinding effects on the inner surface of a product, so that the inner surface of the workpiece obtains certain cleanliness, and the method is a high-efficiency processing method. The roller shaft conveyor penetrates through the shot blasting chamber, the output end of the roller shaft conveyor is a buffer frame, the conveying trolley is positioned on one side of the buffer frame, the conveying trolley horizontally inputs the inner wall sand blaster into the white copper pipe bar, and the roller shaft conveyor, the shot blasting chamber, the buffer frame, the conveying trolley, the inner wall sand blaster, the shot blasting machine, the separator and the elevator are all equipment which can be directly purchased from the market.
Detailed Description
The present invention will be described in further detail with reference to the following examples and embodiments:
example 1
Alloy designation: b10-1
Specification: phi 185 x 7.5mm length 4500mm of white copper tube bar
The technical requirements are as follows: no black oxide scale residue after surface treatment
Sawing and straightening: sawing the head and the tail of the extruded cupronickel tube bar, eccentrically cutting the head by 300mm, extruding and compressing the tail by 500mm and cutting the tail by 3700mm, and straightening by using a horizontal press, wherein the straightness is less than or equal to 5mm/m after straightening;
feeding: the shot blasting machine is prepared and checked before shot blasting, the diameter of stainless steel shot materials in a sand box is 0.15mm, the total amount is 10-13 tons, and after comprehensive checking, the circulating system, the recovery separation system and the dust removal system are required to be ensured to be capable of normally operating;
material stirring to a roller shaft conveyor: placing the cut and straightened white copper tube bar on a rotary roller way of a roller shaft conveyor, wherein the white copper tube bar advances on the rotary roller way of the roller shaft conveyor in a rotary state, and the conveying speed of the roller shaft conveyor is 0.8 m/min;
shot blasting on the outer wall: the rotary roller way of the roller shaft conveyor conveys the cupronickel tube bar forwards into a closed shot blasting chamber, the cupronickel tube bar in the shot blasting chamber is still in a rotary state on the rotary roller way and continuously moves forwards slowly, a plurality of groups of spray heads capable of spraying high-speed shot blasting are arranged at each part of the upper part and the lower part in the shot blasting chamber, two abrator machines are arranged above the top of the shot blasting chamber in parallel, the abrator machines drive an impeller body to rotate at a high speed by a motor, the shot blasting is thrown to the outer surface of the cupronickel tube bar under the action of centrifugal force, the outer surface of the cupronickel tube bar is subjected to high-frequency striking of high-speed stainless steel shots from each direction, when the cupronickel tube bar on the rotary roller way moves to be close to an outlet of the abrator machines, the abrator machines stop the shot blasting, at the moment, black oxide skins on the circumferential outer surface of the cupronickel tube bar are completely removed, the impeller rotating speed of each abrator is 2900 rpm, and the height of the tube is 350mm away from the tube, the pill output is 220 kg/min;
material shifting to a buffer frame: the white copper tube bar material with the black oxide skin removed is continuously output to a shot blasting chamber to a buffer frame of an internal spraying station by a roller shaft conveyor, a mixture of shot materials and oxide skin dust in the shot blasting chamber falls into a lower hopper and enters a separator through a lifting machine to be separated from the oxide skin dust, the mixture of stainless steel shots, waste materials and oxide skin dust respectively falls into different channels according to different specific weights, pure and qualified stainless steel shots enter a hopper for use by the shot blasting machine, the unseparated mixture flows into the lifting machine to enter the separator again for re-separation, fine dust is sucked into a dust remover, granular dust is captured and collected, the separated stainless steel shots fall into a sand storage box for recycling, and the oxide skin dust enters the dust remover through a pipeline to be collected;
inner surface shot blasting: fixing the white copper pipe bar on the buffer frame by using a fixture, driving an inner wall sand blower to approach the white copper pipe bar by a conveying trolley, wherein the inner wall sand blower is a hollow long rod, nozzles are uniformly distributed on the periphery of the discharge end of the inner wall sand blower, when the nozzles of the inner wall sand blower enter the white copper pipe bar along the axial line of the white copper pipe bar, a high-pressure gas is generated in the inner wall sand blower by an air compressor, stainless steel shots in a sand box flow into the inner wall sand blower, the high-pressure gas in the inner wall sand blower pushes the stainless steel shots in the inner wall sand blower to be sprayed out from the nozzles to all directions, the inner surface of the white copper pipe bar is subjected to high-frequency striking from the high-speed stainless steel shots from all directions, the feeding speed of the inner wall sand blower is 8-15 mm/s, the pressure of the air compressor matched with the inner wall sand blower is 0.6-0.7MPa, the flow is 10-13m3The sand output is 25-35 kg/min, the inner wall sand blower withdraws after sand blasting of the inner wall sand blower enters and exits the white copper tube bar twice, and sand blasting of the inner wallThe device enters the white copper tube bar in a sand-free state, residual sand on the inner wall of the white copper tube bar is cleaned through high-pressure gas, and oxide skin on the inner wall of the white copper tube bar is completely removed;
the inner wall sand blaster is withdrawn and cleaned: the inner wall sand blaster is withdrawn and cleaned: after the inner surface of the white copper pipe bar is shot-blasted, the inner wall sand blaster exits from the inside of the white copper pipe bar along the axial lead of the white copper pipe bar, the mixture of shot materials and oxide skin dust in the white copper pipe bar falls into a lower hopper, the mixture enters a separator through a lifting machine to separate the shot materials from the oxide skin dust, the mixture of stainless steel shots, waste materials and the oxide skin dust respectively fall into different channels according to different specific gravities of the mixture, pure and qualified stainless steel shots enter a hopper for use by a shot blasting machine, the unseparated mixture flows into the lifting machine to enter the separator again for re-separation, fine dust is sucked into a dust remover, granular dust is captured and collected, the separated stainless steel shots fall into a sand storage box for recycling, and the oxide skin dust enters the dust remover through a pipeline to be collected;
unloading and blowing for cleaning: stirring the white copper pipe bar to a discharging frame for discharging, and blowing air to clean residual sand on the inner surface and the outer surface of the white copper pipe bar;
after the processes are finished, the subsequent stretching, annealing and redrawing are carried out to phi 159 x 3.5mm to obtain a finished product.
Claims (1)
1. A method for treating oxide skins on the inner and outer surfaces of an extruded cupronickel tube bar is characterized by comprising the following steps: the process flow sequentially comprises the following steps: sawing, straightening, feeding, stirring to a roller shaft conveyor, performing shot blasting on the outer wall, stirring to a buffer frame, performing shot blasting on the inner surface, withdrawing and cleaning an inner wall sand blaster, discharging and blowing for cleaning;
step one, saw cutting and straightening: cutting and straightening the extruded cupronickel tube bar;
step two, feeding: the shot blasting machine is prepared and checked before shot blasting, the diameter of stainless steel shot materials in a sand box is 0.1-0.3mm, the total weight is 10-13 tons, and a circulating system, a recovery separation system and a dust removal system are required to be ensured to be capable of normally operating after comprehensive checking;
thirdly, material shifting to a roller shaft conveyor: placing the cut and straightened white copper tube bar on a rotary roller way of a roller shaft conveyor, wherein the white copper tube bar advances on the rotary roller way of the roller shaft conveyor in a rotary state, and the conveying speed of the roller shaft conveyor is 0.5-1.2 m/min;
fourthly, shot blasting on the outer wall: the rotary roller way of the roller conveyer conveys the cupronickel tube bar forwards into a closed shot blasting chamber, the cupronickel tube bar in the shot blasting chamber is still in a rotary state on the rotary roller way and continuously moves forwards slowly, a plurality of groups of spray heads capable of spraying high-speed shot blasting are arranged at each part of the upper part and the lower part in the shot blasting chamber, two abrator machines are arranged above the top of the shot blasting chamber in parallel, the abrator machines drive an impeller body to rotate at high speed by a motor, the shot blasting is thrown to the outer surface of the cupronickel tube bar by the action of centrifugal force, the outer surface of the cupronickel tube bar is subjected to high-frequency shot blasting by high-speed stainless steel shots from each direction, when the cupronickel tube bar on the rotary roller way moves to be close to an outlet of the abrator, the abrator machines stop abrator blasting, at the moment, black oxide skins on the circumferential outer surface of the cupronickel tube bar are all removed, the impeller rotation speed of each abrator impeller is 2700-, the pill output is 210-230 kg/min;
fifthly, material shifting to a buffer frame: the white copper tube bar material with the black oxide skin removed is continuously output to a shot blasting chamber to a buffer frame of an internal spraying station by a roller shaft conveyor, a mixture of shot materials and oxide skin dust in the shot blasting chamber falls into a lower hopper and enters a separator through a lifting machine to be separated from the oxide skin dust, the mixture of stainless steel shots, waste materials and oxide skin dust respectively falls into different channels according to different specific weights, pure and qualified stainless steel shots enter a hopper for use by the shot blasting machine, the unseparated mixture flows into the lifting machine to enter the separator again for re-separation, fine dust is sucked into a dust remover, granular dust is captured and collected, the separated stainless steel shots fall into a sand storage box for recycling, and the oxide skin dust enters the dust remover through a pipeline to be collected;
sixthly, inner surface shot blasting: fixing the white copper pipe bar on the buffer frame by using a fixture, driving the inner wall sand blaster to approach the white copper pipe bar by using the conveying trolley, wherein the inner wall sand blaster is a hollow long rod, and the periphery of the discharge end of the inner wall sand blaster is uniformly distributedThe inner wall sand blaster comprises a nozzle, when the nozzle of the inner wall sand blaster enters the white copper pipe bar along the axial lead of the white copper pipe bar, high-pressure gas is generated in the inner wall sand blaster by an air compressor, stainless steel shots in a sand box flow into the inner wall sand blaster, the stainless steel shots in the inner wall sand blaster are pushed by the high-pressure gas in the inner wall sand blaster to be sprayed out from the nozzle in all directions, the inner surface of the white copper pipe bar is hit by the high-frequency stainless steel shots from all directions, the feeding speed of the inner wall sand blaster is 8-15 mm/s, the pressure of the air compressor matched with the inner wall sand blaster is 0.6-0.7MPa, and the flow is 10-13m3The sand output is 25-35 kg/min, the inner wall sand blower is withdrawn after sand blasting and entering the white copper tube bar twice, the inner wall sand blower enters the white copper tube bar in a sand-free state and cleans residual sand on the inner wall of the white copper tube bar through high-pressure gas, and oxide skin on the inner wall of the white copper tube bar is completely removed;
seventhly, the inner wall sand blaster is withdrawn and cleaned: after the inner surface of the white copper pipe bar is shot-blasted, the inner wall sand blaster exits from the inside of the white copper pipe bar along the axial lead of the white copper pipe bar, the mixture of shot materials and oxide skin dust in the white copper pipe bar falls into a lower hopper, the mixture enters a separator through a lifting machine to separate the shot materials from the oxide skin dust, the mixture of stainless steel shots, waste materials and the oxide skin dust respectively fall into different channels according to different specific gravities of the mixture, pure and qualified stainless steel shots enter a hopper for use by a shot blasting machine, the unseparated mixture flows into the lifting machine to enter the separator again for re-separation, fine dust is sucked into a dust remover, granular dust is captured and collected, the separated stainless steel shots fall into a sand storage box for recycling, and the oxide skin dust enters the dust remover through a pipeline to be collected;
eighth step, unloading and blowing cleaning: and (4) stirring the white copper pipe bar to a discharging frame for discharging, and blowing air to clean the residual sand on the inner surface and the outer surface of the white copper pipe bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN202895003U (en) * | 2012-09-14 | 2013-04-24 | 东莞市联发铸造有限公司 | Shot blasting machine |
| CN104117925A (en) * | 2013-04-23 | 2014-10-29 | 王兴芳 | Roller way conveying type steel pipe shot blasting cleaning machine |
| CN104139343A (en) * | 2014-07-14 | 2014-11-12 | 江苏龙城铸造机械科技有限公司 | Pneumatic shot blast machine for inner and outer walls of steel pipes |
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