CN112893557A - Copper pipe bending device based on lead pouring process and pipe bending method thereof - Google Patents
Copper pipe bending device based on lead pouring process and pipe bending method thereof Download PDFInfo
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- CN112893557A CN112893557A CN202110208723.0A CN202110208723A CN112893557A CN 112893557 A CN112893557 A CN 112893557A CN 202110208723 A CN202110208723 A CN 202110208723A CN 112893557 A CN112893557 A CN 112893557A
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 146
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 146
- 239000010949 copper Substances 0.000 title claims abstract description 146
- 238000005452 bending Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 61
- 230000008569 process Effects 0.000 title claims abstract description 29
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 238000002844 melting Methods 0.000 claims description 84
- 230000008018 melting Effects 0.000 claims description 84
- 238000003756 stirring Methods 0.000 claims description 37
- 238000012360 testing method Methods 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 18
- 238000011990 functional testing Methods 0.000 claims description 15
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 239000000243 solution Substances 0.000 abstract description 27
- 239000007864 aqueous solution Substances 0.000 abstract description 6
- 238000011089 mechanical engineering Methods 0.000 abstract description 2
- 238000005057 refrigeration Methods 0.000 abstract description 2
- XMFOQHDPRMAJNU-UHFFFAOYSA-N lead(ii,iv) oxide Chemical compound O1[Pb]O[Pb]11O[Pb]O1 XMFOQHDPRMAJNU-UHFFFAOYSA-N 0.000 description 12
- 229940035105 lead tetroxide Drugs 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005429 filling process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000004642 transportation engineering Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/15—Bending tubes using mandrels or the like using filling material of indefinite shape, e.g. sand, plastic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/16—Auxiliary equipment, e.g. machines for filling tubes with sand
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
- C23G1/103—Other heavy metals copper or alloys of copper
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/04—Apparatus for cleaning or pickling metallic material for cleaning pipes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention provides a copper pipe bending device based on a lead pouring process and a pipe bending method thereof, and belongs to the technical field of mechanical engineering and refrigeration pipe fittings. According to the copper pipe bending method, a lead solution is filled into a hollow copper pipe, the hollow copper pipe is cooled and then is subjected to press bending by a numerical control pipe bending machine, the lead solution in the copper pipe is discharged by heating, and then the lead solution remained in the press-bent copper pipe is removed by a hydrochloric acid aqueous solution, so that the press-bent copper pipe is obtained. The method can reduce the folds and the fractures at the bending part of the copper pipe, reduce the cost and improve the working efficiency at the same time.
Description
Technical Field
The invention belongs to the technical field of mechanical engineering and refrigeration pipe fittings, and particularly relates to a copper pipe bending device based on a lead pouring process and a copper pipe bending method.
Background
The pipe bending forming is a processing procedure in the field of pipe plastic processing, and takes a pipe as a blank, and the pipe is processed into a bent part with a certain bending radius, a certain bending angle and a certain shape by a certain plastic processing forming method. The bending piece bent by the pipe has a series of excellent performances such as light weight, strong shock absorption capacity, large medium flux and the like, is widely applied to various fields such as automobile industry, aerospace, ships, liquid and gas pipeline transportation engineering and the like, and the quality of the bending pipe has very important influence on the performances such as the reasonability, the reliability, the safety and the like of the product structure in the applied field, so that the deep research on the forming rule of the bending pipe has very important significance.
The bending forming process of the pipe is a complex elastic and plastic deformation process of nonlinearity (including geometric nonlinearity, material nonlinearity, boundary conditions and the like) under multi-parameter coupling interaction, and the external load acting on the pipe influences the stress strain state in the pipe, so that the elastic or plastic deformation of the pipe is determined. During the bending and forming process of the pipe, the stress-strain state inside the pipe generates complex changes, and the changes (size, direction, change speed and the like) affect the final forming quality of the bent pipe. In the pipe bending forming process, the traditional sand filling process is adopted, the bent pipe is easy to have quality defects of fracture, cross section distortion, wrinkling, resilience and the like, the defects not only can lead to the improvement of production cost and the reduction of production efficiency, but also can reduce the shape and size precision of the bent pipe and reduce the use performance of the pipe.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a copper pipe bending device based on a lead pouring process and a copper pipe bending method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme: a copper pipe bending device based on a lead pouring process comprises a lead melting furnace, a cooling plate, a numerical control pipe bending machine, a second conveying belt and a heating plate which are sequentially arranged, wherein a first conveying belt is arranged below the lead melting furnace.
The invention also provides a pipe bending method of the copper pipe bending device based on the lead pouring process, which specifically comprises the following steps:
(1) melting lead: putting the cleaned lead ingot into a lead melting furnace, heating the lead melting furnace to 380-420 ℃, wherein the heating rate is less than 52 ℃/s, melting the lead ingot, then preserving the heat of the lead melting furnace for 1 hour, and stirring the lead solution in a molten state in the heat preservation process;
(2) filling lead into the hollow copper pipe: fixing the hollow copper pipe in a copper pipe fixing device, conveying the fixed hollow copper pipe to the position right below a lead melting furnace through a first conveyor belt, and pouring the molten lead solution in the step (1) into the hollow copper pipe to finish lead pouring of the hollow copper pipe;
(3) and (3) cooling the lead-filled copper pipe: conveying the copper pipe subjected to lead filling to a cooling disc through a first conveyor belt, and cooling the copper pipe subjected to lead filling to room temperature;
(4) and (3) bending the lead-filled copper pipe: putting the lead-filled copper pipe cooled in the step (3) into a track of a numerical control pipe bender, and bending the lead-filled copper pipe;
(5) and (3) lead discharging of the hollow copper pipe: and taking out the bent lead-filled copper pipe, placing the bent lead-filled copper pipe on a heating plate through a second conveyor belt, heating to 350-400 ℃, discharging a lead solution in the copper pipe, then washing the inside of the copper pipe by using a dilute hydrochloric acid solution until no lead solution is left, and then washing for the second time by using clear water to obtain the bent copper pipe.
Further, the lead melting furnace performs a functional test of lead melting before lead melting, and performs the process of the step (1) when all the functional tests of lead melting pass.
Further, the functional test of the lead melt comprises the following steps: the method comprises the following steps of a lead melting furnace working temperature test, a lead melting furnace output pipeline smoothness test, a pipeline valve tool state test and a sealing test.
Further, in the step (1), the stirring mode sequentially adopts a stirring speed of 20r/min for 10 minutes, a stirring speed of 40r/min for 10 minutes and a stirring speed of 60r/min for 10 minutes, and each stirring interval is 10 min.
Further, the hollow copper pipe in the step (2) meets the following requirements before lead filling: the temperature difference between the inner wall and the outer wall of the lead melting furnace is not more than 56 ℃, and the temperature difference between the lead solution and the inner wall of the lead melting furnace is not more than 41 ℃.
Further, the concentration of the dilute hydrochloric acid in the step (5) is 2.5-5 mol/L.
Compared with the prior art, the invention has the following beneficial effects: the method for bending the copper pipe utilizes the advantages that the lead solution has low melting point, high corrosion resistance, difficult penetration of X rays, gamma rays and the like and good plasticity, can be attached to the hollow copper pipe, does not generate the phenomena of gaps, air holes and the like, can completely fill the whole copper pipe, can be quickly solidified at room temperature, does not generate the phenomenon similar to sand leakage in a sand filling process, can reduce folds and fractures at the bending part of the copper pipe when the copper pipe is bent, reduces the cost and improves the working efficiency. In addition, the copper pipe bending method adopts hydrochloric acid aqueous solution to remove lead residues remained on the inner wall of the copper pipe, and because the lead is combined with oxygen to generate the lead tetroxide during heating, the structure is relatively stable, the lead tetroxide can not be completely washed by direct water washing, the residue remained on the inner wall of the copper pipe is completely dissolved by skillfully utilizing the chemical reaction generated by the lead tetroxide and the dilute hydrochloric acid, the concentration of the hydrochloric acid is controlled to be 2.5-5 mol/L, and the reducing capability of hydrogen atoms of the hydrochloric acid is higher than that of the copper, so the inner wall of the copper pipe can not be corroded by the hydrochloric acid, the copper and the hydrochloric acid can not generate the chemical reaction, and the cost can be reduced while the quality of the copper pipe bending is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a copper pipe bending device based on a lead pouring process.
Detailed Description
Referring to fig. 1, the invention provides a schematic structural diagram of a copper pipe bending device based on a lead filling process, the copper pipe bending device comprises a lead melting furnace 1, a cooling plate 3, a numerical control pipe bender 4, a second conveyor belt 5 and a heating plate 6 which are sequentially arranged, and a first conveyor belt 2 is arranged below the lead melting furnace.
The invention provides a copper pipe bending method based on a lead pouring process, which specifically comprises the following steps:
first, the lead melting furnace 1 performs a functional test of melting lead before melting lead, the functional test of melting lead including: the method comprises the following steps of (1) carrying out a lead melting furnace working temperature test, a lead melting furnace output pipeline smoothness test, a pipeline valve tool state test and a sealing test; when all the functional tests of the lead melting are passed, the following steps are carried out.
(1) Melting lead: putting the cleaned lead ingot into a lead melting furnace 1, heating the lead melting furnace 1 to 380-420 ℃, wherein the heating rate is less than 52 ℃/s, melting the lead ingot, preventing local overheating in the lead melting furnace 1, and meanwhile, if the heating rate exceeds 52 ℃/s, increasing the disorder degree inside the lead ingot, so that the energy in the lead melting furnace 1 is increased, and the energy barrier of lead ingot melting phase change is reduced. Then, preserving the heat of the lead melting furnace 1 for 1 hour, and stirring the molten lead solution in the heat preservation process; the stirring mode adopted by the invention is as follows: stirring for 10 minutes at a stirring speed of 20r/min, stirring for 10 minutes at a stirring speed of 40r/min and stirring for 10 minutes at a stirring speed of 60r/min in sequence, wherein the stirring interval is 10 minutes every time, so that the aims of degassing and deslagging while uniformly heating the lead solution are fulfilled.
(2) Filling lead into the hollow copper pipe: when the temperature difference between the inner wall and the outer wall of the lead melting furnace 1 is not more than 56 ℃ and the temperature difference between the lead solution and the inner wall of the lead melting furnace is not more than 41 ℃, fixing the hollow copper pipe in a copper pipe fixing device, conveying the fixed hollow copper pipe to the position right below the lead melting furnace 1 through a first conveyor belt 2, and pouring the lead solution in a molten state in the step (1) into the hollow copper pipe to finish the lead pouring of the hollow copper pipe; if the temperature difference between the inner wall and the outer wall of the lead melting furnace 1 is greater than 56 ℃, the inside of the lead melting furnace can generate larger thermal stress, so that the oxidation of the outer skin in the lead melting furnace is accelerated, and the potential safety hazard is generated; if the temperature difference between the lead solution and the inner wall of the lead melting furnace is more than 41 ℃, the vapor pressure of the lead solution is reduced, temperature loss is caused, the evaporation speed of the lead solution is increased, and the cost is increased.
(3) And (3) cooling the lead-filled copper pipe: conveying the copper pipe subjected to lead pouring to a cooling disc 3 through a first conveyor belt 2, and cooling the copper pipe subjected to lead pouring to room temperature;
(4) and (3) bending the lead-filled copper pipe: putting the lead-filled copper pipe cooled in the step (3) into a track of a numerical control pipe bender 4, and bending the lead-filled copper pipe;
(5) and (3) lead discharging of the hollow copper pipe: and taking out the bent copper pipe filled with lead, placing the bent copper pipe on a heating plate 6 through a second conveyor belt 5, heating to 350-400 ℃, discharging a lead solution in the copper pipe, then washing the inside of the copper pipe by using a 2.5-5 mol/L hydrochloric acid aqueous solution until no lead solution remains, and then washing for the second time by using clear water to obtain the bent copper pipe. The method has the advantages that the hydrochloric acid aqueous solution is adopted to remove the lead residues remained on the inner wall of the copper pipe, the lead is combined with oxygen to generate the lead tetroxide during heating, the structure is stable, the lead tetroxide can not be completely washed by water directly, the chemical reaction generated by the lead tetroxide and the dilute hydrochloric acid is ingeniously utilized to dissolve the residues remained on the inner wall of the copper pipe, the concentration of the hydrochloric acid is controlled to be 2.5-5 mol/L, the reducing capability of hydrogen atoms of the hydrochloric acid is higher than that of the copper, so the inner wall of the copper pipe cannot be corroded by the hydrochloric acid, and the copper and the hydrochloric acid cannot generate the chemical reaction.
Example 1
The invention provides a copper pipe bending method based on a lead pouring process, which specifically comprises the following steps:
first, the lead melting furnace 1 performs a functional test of melting lead before melting lead, the functional test of melting lead including: the method comprises the following steps of (1) carrying out a lead melting furnace working temperature test, a lead melting furnace output pipeline smoothness test, a pipeline valve tool state test and a sealing test; when all the functional tests of the lead melting are passed, the following steps are carried out;
(1) melting lead: putting the cleaned lead ingot into a lead melting furnace 1, heating the lead melting furnace 1 to 380 ℃ at a heating rate of 48 ℃/s, melting the lead ingot, then keeping the temperature of the lead melting furnace 1 for 1 hour, and stirring the lead solution in a molten state in the heat preservation process; stirring for 10 minutes at a stirring speed of 20r/min, stirring for 10 minutes at a stirring speed of 40r/min, and stirring for 10 minutes at a stirring speed of 60r/min, wherein the stirring interval is 10 minutes each time.
(2) Filling lead into the hollow copper pipe: fixing the hollow copper pipe in a copper pipe fixing device, conveying the fixed hollow copper pipe to the position right below a lead melting furnace 1 through a first conveyor belt 2, and filling the molten lead solution in the step (1) into the hollow copper pipe to finish lead filling of the hollow copper pipe;
(3) and (3) cooling the lead-filled copper pipe: conveying the copper pipe subjected to lead pouring to a cooling disc 3 through a first conveyor belt 2, and cooling the copper pipe subjected to lead pouring to room temperature;
(4) and (3) bending the lead-filled copper pipe: putting the lead-filled copper pipe cooled in the step (3) into a track of a numerical control pipe bender 4, and bending the lead-filled copper pipe;
(5) and (3) lead discharging of the hollow copper pipe: and taking out the bent copper pipe filled with lead, placing the bent copper pipe on a heating plate 6 through a second conveyor belt 5, heating to 350 ℃, discharging a lead solution in the copper pipe, then washing the inside of the copper pipe by using a 2.5mol/L hydrochloric acid aqueous solution until no lead solution remains, and then washing for the second time by using clear water to obtain the bent copper pipe.
Through the detection of the flaring test and the hydraulic test of the pipe material, the bending copper pipe obtained by the method is found that the inner surface and the outer surface of the bending copper pipe are smooth and clean, no air bubbles or cracks exist, and no obvious folds or deformation exists at the bending part, so that the method can effectively reduce the folds and the fractures at the bending part of the copper pipe and improve the quality of the bending copper pipe.
Example 2
The invention provides a copper pipe bending method based on a lead pouring process, which specifically comprises the following steps:
first, the lead melting furnace 1 performs a functional test of melting lead before melting lead, the functional test of melting lead including: the method comprises the following steps of (1) carrying out a lead melting furnace working temperature test, a lead melting furnace output pipeline smoothness test, a pipeline valve tool state test and a sealing test; when all the functional tests of the lead melting are passed, the following steps are carried out;
(1) melting lead: putting the cleaned lead ingot into a lead melting furnace 1, heating the lead melting furnace 1 to 420 ℃ at a heating rate of 50 ℃/s, melting the lead ingot, then keeping the temperature of the lead melting furnace 1 for 1 hour, and stirring the lead solution in a molten state in the heat preservation process; stirring for 10 minutes at a stirring speed of 20r/min, stirring for 10 minutes at a stirring speed of 40r/min, and stirring for 10 minutes at a stirring speed of 60r/min, wherein the stirring interval is 10 minutes each time.
(2) Filling lead into the hollow copper pipe: fixing the hollow copper pipe in a copper pipe fixing device, conveying the fixed hollow copper pipe to the position right below a lead melting furnace 1 through a first conveyor belt 2, and filling the molten lead solution in the step (1) into the hollow copper pipe to finish lead filling of the hollow copper pipe;
(3) and (3) cooling the lead-filled copper pipe: conveying the copper pipe subjected to lead pouring to a cooling disc 3 through a first conveyor belt 2, and cooling the copper pipe subjected to lead pouring to room temperature;
(4) and (3) bending the lead-filled copper pipe: putting the lead-filled copper pipe cooled in the step (3) into a track of a numerical control pipe bender 4, and bending the lead-filled copper pipe;
(5) and (3) lead discharging of the hollow copper pipe: and taking out the bent copper pipe filled with lead, placing the bent copper pipe on a heating plate 6 through a second conveyor belt 5, heating to 400 ℃, discharging a lead solution in the copper pipe, then washing the inside of the copper pipe by using a 5mol/L hydrochloric acid aqueous solution until no lead solution remains, and then washing for the second time by using clear water to obtain the bent copper pipe.
Through the detection of the flaring test and the hydraulic test of the pipe material, the bending copper pipe obtained by the method is found that the inner surface and the outer surface of the bending copper pipe are smooth and clean, no air bubbles or cracks exist, and no obvious folds or deformation exists at the bending part, so that the method can effectively reduce the folds and the fractures at the bending part of the copper pipe and improve the quality of the bending copper pipe.
Claims (7)
1. The copper pipe bending device based on the lead pouring process is characterized by comprising a lead melting furnace (1), a cooling plate (3), a numerical control pipe bending machine (4), a second conveying belt (5) and a heating plate (6) which are sequentially arranged, wherein a first conveying belt (2) is arranged below the lead melting furnace.
2. A pipe bending method of a copper pipe bending device based on a lead pouring process, according to claim 1, characterized in that: the method specifically comprises the following steps:
(1) melting lead: putting the cleaned lead ingot into a lead melting furnace, heating the lead melting furnace to 380-420 ℃, wherein the heating rate is less than 52 ℃/s, melting the lead ingot, then preserving the heat of the lead melting furnace for 1 hour, and stirring the lead solution in a molten state in the heat preservation process;
(2) filling lead into the hollow copper pipe: fixing the hollow copper pipe in a copper pipe fixing device, conveying the fixed hollow copper pipe to the position right below a lead melting furnace through a first conveyor belt, and pouring the molten lead solution in the step (1) into the hollow copper pipe to finish lead pouring of the hollow copper pipe;
(3) and (3) cooling the lead-filled copper pipe: conveying the copper pipe subjected to lead filling to a cooling disc through a first conveyor belt, and cooling the copper pipe subjected to lead filling to room temperature;
(4) and (3) bending the lead-filled copper pipe: putting the lead-filled copper pipe cooled in the step (3) into a track of a numerical control pipe bender, and bending the lead-filled copper pipe;
(5) and (3) lead discharging of the hollow copper pipe: and taking out the bent lead-filled copper pipe, placing the bent lead-filled copper pipe on a heating plate through a second conveyor belt, heating to 350-400 ℃, discharging a lead solution in the copper pipe, then washing the inside of the copper pipe by using a dilute hydrochloric acid solution until no lead solution is left, and then washing for the second time by using clear water to obtain the bent copper pipe.
3. The pipe bending method of the copper pipe bender based on the lead pouring process according to claim 2, characterized in that: and (3) carrying out a functional test of lead melting before the lead melting furnace carries out lead melting, and carrying out the process of the step (1) when all the functional tests of lead melting pass.
4. The copper pipe bending method based on the lead pouring process according to claim 2, characterized in that: the functional test of the lead melting comprises the following steps: the method comprises the following steps of a lead melting furnace working temperature test, a lead melting furnace output pipeline smoothness test, a pipeline valve tool state test and a sealing test.
5. The copper pipe bending method based on the lead pouring process according to claim 2, characterized in that: and (2) stirring in the step (1) for 10 minutes at a stirring speed of 20r/min, 10 minutes at a stirring speed of 40r/min and 10 minutes at a stirring speed of 60r/min in sequence, wherein the stirring interval is 10 minutes each time.
6. The copper pipe bending method based on the lead pouring process according to claim 2, characterized in that: the hollow copper pipe in the step (2) meets the following requirements before lead filling: the temperature difference between the inner wall and the outer wall of the lead melting furnace is not more than 56 ℃, and the temperature difference between the lead solution and the inner wall of the lead melting furnace is not more than 41 ℃.
7. The copper pipe bending method based on the lead pouring process according to claim 2, characterized in that: the concentration of the dilute hydrochloric acid in the step (5) is 2.5-5 mol/L.
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| CN202110208723.0A CN112893557A (en) | 2021-02-25 | 2021-02-25 | Copper pipe bending device based on lead pouring process and pipe bending method thereof |
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