CN118143587A - Preparation method of bent pipe - Google Patents
Preparation method of bent pipe Download PDFInfo
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- CN118143587A CN118143587A CN202410373292.7A CN202410373292A CN118143587A CN 118143587 A CN118143587 A CN 118143587A CN 202410373292 A CN202410373292 A CN 202410373292A CN 118143587 A CN118143587 A CN 118143587A
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- pipe
- bent pipe
- convex hull
- bending
- bent
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- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 238000005452 bending Methods 0.000 claims abstract description 55
- 239000000463 material Substances 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 18
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 9
- 238000003825 pressing Methods 0.000 claims abstract description 8
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 238000005498 polishing Methods 0.000 claims abstract description 3
- 239000003921 oil Substances 0.000 claims description 24
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 239000002199 base oil Substances 0.000 claims description 11
- 239000005662 Paraffin oil Substances 0.000 claims description 7
- CZBZUDVBLSSABA-UHFFFAOYSA-N butylated hydroxyanisole Chemical compound COC1=CC=C(O)C(C(C)(C)C)=C1.COC1=CC=C(O)C=C1C(C)(C)C CZBZUDVBLSSABA-UHFFFAOYSA-N 0.000 claims description 7
- 239000003963 antioxidant agent Substances 0.000 claims description 5
- 230000003078 antioxidant effect Effects 0.000 claims description 5
- SPSPIUSUWPLVKD-UHFFFAOYSA-N 2,3-dibutyl-6-methylphenol Chemical compound CCCCC1=CC=C(C)C(O)=C1CCCC SPSPIUSUWPLVKD-UHFFFAOYSA-N 0.000 claims description 3
- 235000021355 Stearic acid Nutrition 0.000 claims description 3
- 235000010354 butylated hydroxytoluene Nutrition 0.000 claims description 3
- 239000003112 inhibitor Substances 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 3
- 239000008117 stearic acid Substances 0.000 claims description 3
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 2
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 2
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 2
- 239000005642 Oleic acid Substances 0.000 claims description 2
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000013556 antirust agent Substances 0.000 claims description 2
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 2
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 39
- 239000002184 metal Substances 0.000 description 16
- 229910052751 metal Inorganic materials 0.000 description 16
- 239000010935 stainless steel Substances 0.000 description 12
- 229910001220 stainless steel Inorganic materials 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 238000012360 testing method Methods 0.000 description 9
- 238000005520 cutting process Methods 0.000 description 8
- 238000004512 die casting Methods 0.000 description 6
- 238000005461 lubrication Methods 0.000 description 4
- 238000004506 ultrasonic cleaning Methods 0.000 description 4
- 238000007373 indentation Methods 0.000 description 3
- 238000013101 initial test Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention provides a preparation method of an elbow, which comprises the following steps: selecting a cut pipe material, removing burrs at two ends of the pipe material, and performing ultrasonic treatment; determining a bending point of the pipe material subjected to ultrasonic treatment, coating bent pipe oil at the bending point, and then bending by using a bending process to obtain a bent pipe; reaming the bent pipe; curling the cut of the bent pipe with the hole expanded into a rib or flanging the rib into a groove shape, and then pressing a convex hull at the pipe body; and chamfering an angle a of the bent pipe with the pressed convex hull, and polishing again to obtain the finished product. The preparation method ensures that the manufactured bent pipe does not need welding, has better sealing performance, obviously improves the tensile strength and the hardness, simultaneously effectively reduces the cost and improves the product quality.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a preparation method of an elbow.
Background
Due to the continuous development of mechanical fields such as automobiles, aerospace and the like, the application of the bent pipe is more and more wide, the bent pipe can realize the design and the installation of a complex network pipeline system by connecting, steering, shrinking and expanding the pipeline size, and the indispensable technical support is provided for the development of various fields. With the wide application of the bent pipe, various preparation methods and related processes of the bent pipe are also developed. The common manufacturing process of the bent pipe at present is a stamping forming and die casting process.
The stamping forming method uses a press and a die to apply external force to plates, strips, pipes, sectional materials and the like to make the plates, the strips, the pipes, the sectional materials and the like plastically deform or separate, thereby obtaining the workpiece (stamping part) with the required shape and size. The stamped blanks are mainly hot-rolled and cold-rolled steel sheets and strips. The die casting process utilizes the inner cavity of the die to apply high pressure to the melted metal so as to achieve the purpose of preparation.
The stamping forming is high in efficiency and convenient to operate, but if the precision requirement of parts is too high, the stamping production is difficult to meet the requirement; the die casting molding cost is high, and the die casting molding method is only suitable for metals with high fluidity. Therefore, in order to meet the demands of production and life, a preparation method which reduces energy consumption, has lower cost and can improve tensile strength and hardness is needed.
In view of this, the present invention has been made.
Disclosure of Invention
The first object of the present invention is to provide a method for manufacturing an elbow pipe, which can effectively reduce energy consumption, has low cost, and can effectively improve the tensile strength and hardness of the manufactured elbow pipe.
The second purpose of the invention is to provide the bent pipe prepared by the preparation method, which has higher tensile strength and hardness.
In order to achieve the above object of the present invention, the following technical solutions are specifically adopted:
The preparation method of the bent pipe comprises the following steps:
Selecting a cut pipe material, removing burrs at two ends of the pipe material, and performing ultrasonic treatment;
determining a bending point of the pipe material subjected to ultrasonic treatment, coating bent pipe oil at the bending point, and then bending by using a bending process to obtain a bent pipe;
reaming the bent pipe twice;
Curling the cut of the bent pipe with the hole expanded into a rib or flanging the rib into a groove shape, and then pressing a convex hull at the pipe body;
and chamfering an angle a of the bent pipe with the pressed convex hull, and polishing again to obtain the finished product.
Preferably, as a further specific embodiment, the bending point in the bending process is 1/3 of the pipe body to 2/3 of the pipe body;
Preferably, the bending point is 1/2 of the pipe body.
Preferably, as a further specific embodiment, the bent-tube oil consists of a base oil: rust inhibitor: antioxidant volume ratio= (5-8): (0.1): (0.1);
The antirust agent is one or more of paraffin oil, stearic acid or oleic acid;
The antioxidant is one or more of butyl hydroxy anisole or dibutyl hydroxy toluene.
Preferably, as a further specific embodiment, the ultrasonic frequency of the ultrasonic treatment is 15-25KHz.
Preferably, as a further specific embodiment, in the bending process, the length of the tube body is less than or equal to 1/5 of the length of the tube body of each feeding.
Preferably, as a further specific embodiment, the relation between the convex hull thickness T and the convex hull height H of the press convex hull is h= (4-5) T.
Preferably, as a further specific embodiment, the minimum thickness of the bulge shell is greater than or equal to 70% of the thickness of the tube stock.
Preferably, as a further specific embodiment, the angle of the chamfer a is 30 ° -60 °;
Preferably, the angle of the chamfer a is 45 °.
The bent pipe prepared by the preparation method is used.
In the preparation method, burrs at two ends of the pipe material are removed, and then the pipe material is subjected to ultrasonic treatment, so that the pipe body of the manufactured bent pipe is in a relatively smooth state, the bent pipe is prevented from wrinkling and deforming due to the roughness of the pipe body, and the service life of the bent pipe is shortened.
When the bending point is selected, the bending point is 1/3 to 2/3 of the pipe body, so that the curvature of the bent pipe can be ensured, the condition that the pipe is deviated, twisted or uneven in the bending process can be avoided, and when the selected bending point is smaller than 1/3 or larger than 2/3, the bent pipe is rebounded, the compression capacity of the bent pipe is affected, and the performance of the bent pipe is reduced. The bending point is preferably 1/2 of the pipe body, so that the thickness and the bending angle of the bent pipe can be ensured to the greatest extent, and the tensile strength and the hardness of the bent pipe can be ensured to the greatest extent.
In the ultrasonic process, the ultrasonic frequency is 20-25KHz, the ultrasonic frequency of the prepared metal pipe fitting is not too high, and the lower ultrasonic frequency is more economic benefit for the dirt with larger volume and higher adhesion degree, and the damage to the bent pipe can be reduced. The cleaning effect of the bent pipe is ensured, and meanwhile, the damage to the metal is reduced.
In the preparation process of the invention, the bent pipe oil needs to be coated at the bent point, the bent pipe oil prepared by the invention can protect the bent point in the processing process, and meanwhile, the bent point can be partially lubricated, so that the bent pipe can not generate larger abrasion in the processing process. Meanwhile, the configuration proportion of the bent pipe oil is base oil: rust inhibitor: the antioxidant volume ratio= (5-8): (0.1): (0.1) is formed, the problem that the tensile strength and the hardness are reduced due to non-heating bending at a bending point can be effectively prevented, the lubrication effect can be ensured to the greatest extent by selecting the ratio, the lubrication effect is reduced when the ratio of the base oil is too small, the oil body flow rate is too slow when the ratio of the base oil is too large, and the original lubrication effect is lost.
Meanwhile, the length of the feeding is controlled, so that the length of each feeding is controlled to be 1/5 to 1/4 of the length of the pipe body, the quality reduction of the manufactured product caused by too fast feeding is reduced, the surface hardness is uneven, cracks appear, and other equipment is damaged; when the feeding speed is too slow, the quality of the manufactured bent pipe is affected, and the strength of the bent pipe is reduced.
Secondly, the height and the thickness of the convex hull are limited, when the relation between the thickness T of the convex hull and the height H of the convex hull is defined as H= (4-5) T, and the minimum thickness of the convex hull is larger than 70% of the thickness of the pipe material, the convex hull can be prevented from deforming, and the effect of the bent pipe is influenced; meanwhile, the quality of the bent pipe is prevented from being uneven due to uneven stress.
Finally, in the preparation process, the chamfer angle is selected to be 30-60 degrees, so that the preparation process is more suitable for finish machining of the bent pipe, and when the chamfer angle is too large, the prepared bent pipe is easy to be broken down by fluid in practical application, so that the strength of the bent pipe is reduced; when the angle of the chamfer is too small, assembly becomes difficult or unstable, and it is difficult to achieve the effects of reducing stress and improving durability.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, through optimizing the preparation process, the prepared bent pipe does not need welding, the sealing performance is better, and the tensile strength and the hardness are obviously improved.
(2) The production cost is reduced, and the quality of the manufactured bent pipe is improved.
Drawings
Fig. 1 and 2: an elbow prepared by the preparation method of example 4;
While the present disclosure will now be described in detail and with reference to the illustrative embodiments, the present disclosure is not limited to the specific embodiments shown in the drawings and appended claims.
Detailed Description
The technical solution of the present invention will be clearly and completely described in conjunction with the specific embodiments, but it will be understood by those skilled in the art that the examples described below are some, but not all, examples of the present invention, and are intended to be illustrative only and should not be construed as limiting the scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
Cutting a metal pipe material made of stainless steel, cutting the length of the metal pipe material into 36cm metal sections, removing burrs at two ends of the pipe material by using a polisher, and then performing ultrasonic cleaning by using 20 KHz.
Selecting a position 12cm away from a pipe orifice as a bending point, and flatly coating bent pipe oil at the bending point, wherein the bent pipe oil consists of base oil: paraffin oil: butyl hydroxy anisole volume ratio = 5 (0.1): 0.1.
And placing the stainless steel pipe coated with the pipe bending oil at a pipe bending machine, and feeding the stainless steel pipe with the length of 7.2cm for each feeding to obtain the pipe bending.
And reaming the manufactured bent pipe by using a reamer.
And (3) curling the cut of the bent pipe with the expanded hole into a rib, and pressing the convex hull at the position 5cm away from the pipe orifice, wherein the thickness of the convex hull is 70% of the thickness of the pipe body, and the relation between the thickness T of the convex hull and the height H of the convex hull is H=4T.
Chamfering the pressed convex hulls at an angle of 30 degrees to obtain the finished product.
Example 2
Cutting a metal pipe material made of stainless steel, cutting the length of the metal pipe material into 36cm metal sections, removing burrs at two ends of the pipe material by using a polisher, and then performing ultrasonic cleaning by using 25 KHz.
Selecting a position 18cm away from a pipe orifice as a bending point, and flatly coating bent pipe oil at the bending point, wherein the bent pipe oil consists of base oil: paraffin oil: butyl hydroxy anisole volume ratio = 8, (0.1) to (0.1).
And placing the stainless steel pipe coated with the pipe bending oil at a pipe bending machine, and feeding the stainless steel pipe with the length of 9cm for each feeding to obtain the pipe bending.
And reaming the manufactured bent pipe by using a reamer.
And (3) curling the cut of the bent pipe with the expanded hole into a rib, and pressing the convex hull at the position 5cm away from the pipe orifice, wherein the thickness of the convex hull is 80% of the thickness of the pipe body, and the relation between the thickness T of the convex hull and the height H of the convex hull is H=5T.
Chamfering the pressed convex hulls at an angle of 60 degrees to obtain the finished product.
Example 3
Cutting a metal pipe material made of stainless steel, cutting the length of the metal pipe material into 36cm metal sections, removing burrs at two ends of the pipe material by using a polisher, and then performing ultrasonic cleaning by using 20 KHz.
Selecting a position 24cm away from a pipe orifice as a bending point, and flatly coating bent pipe oil at the bending point, wherein the bent pipe oil consists of base oil: stearic acid: dibutyl hydroxytoluene=5, (0.1): 0.1.
And placing the stainless steel pipe coated with the pipe bending oil at a pipe bending machine, and feeding the stainless steel pipe with the length of 7.2cm for each feeding to obtain the pipe bending.
And reaming the manufactured bent pipe by using a reamer.
And (3) curling the cut of the bent pipe with the expanded hole into a rib, and pressing the convex hull at the position 5cm away from the pipe orifice, wherein the thickness of the convex hull is 70% of the thickness of the pipe body, and the relation between the thickness T of the convex hull and the height H of the convex hull is H=4T.
Chamfering the pressed convex hulls at an angle of 45 degrees to obtain the finished product.
Example 4
Cutting a metal pipe material made of stainless steel, cutting the length of the metal pipe material into 36cm metal sections, removing burrs at two ends of the pipe material by using a polisher, and then performing ultrasonic cleaning by using 20 KHz.
Selecting a position 18cm away from a pipe orifice as a bending point, and flatly coating bent pipe oil at the bending point, wherein the bent pipe oil consists of base oil: paraffin oil: butyl hydroxy anisole volume ratio=7, (0.1): 0.1.
And placing the stainless steel pipe coated with the pipe bending oil at a pipe bending machine, and feeding the stainless steel pipe with the length of 8cm for each feeding time to obtain the pipe bending.
And reaming the manufactured bent pipe by using a reamer.
And (3) curling the cut of the bent pipe with the expanded hole into a rib, and pressing the convex hull at the position 5cm away from the pipe orifice, wherein the thickness of the convex hull is 70% of the thickness of the pipe body, and the relation between the thickness T of the convex hull and the height H of the convex hull is H=5T.
Chamfering the pressed convex hulls at an angle of 45 degrees to obtain the finished product.
Comparative example 1
The position of the bending point was set at 8cm from the orifice, and the rest of the embodiments are identical to example 4.
Comparative example 2
The position of the bending point was set to be 27cm from the orifice, and the rest of the embodiments are identical to example 4.
Comparative example 3
The length of each feed was adjusted to 6cm for each feed and the remaining embodiments were consistent with example 4.
Comparative example 4
The length of each feed was adjusted to 10cm for each feed and the remaining embodiments were consistent with example 4.
Comparative example 5
The relationship between the convex hull thickness T and the convex hull height H was adjusted to t=3h, and the other specific embodiments are the same as in example 4.
Comparative example 6
The relationship between the convex hull thickness T and the convex hull height H was adjusted to t=6h, and the other specific embodiments are the same as in example 4.
Comparative example 7
The minimum thickness of the convex hull was adjusted to 50% of the thickness of the tubing, and the remaining embodiments were consistent with example 4.
Comparative example 8
The chamfer angle was adjusted to 25 °, and the other embodiments were the same as in example 4.
Comparative example 9
The chamfer angle was adjusted to 90 °, and the other embodiments were the same as in example 4.
Comparative example 10
Adjusting the ratio of the bent oil to be base oil: paraffin oil: butyl hydroxy anisole volume ratio = 3 (0.1): 0.1, the remaining embodiments are consistent with example 4.
Comparative example 11
Adjusting the ratio of the bent oil to be base oil: paraffin oil: butyl hydroxy anisole volume ratio = 10 (0.1): 0.1, the remaining embodiments are consistent with example 4.
Comparative example 12
The pipe material with the same material is adopted for carrying out the preparation in a stamping forming mode.
Comparative example 13
The pipe materials with the same material are prepared in a die-casting molding mode.
Experimental example 1 tensile Strength test
The elbows prepared by the different methods in examples and comparative examples were placed in a stretcher and tension was started. During the stretching process, the stretching displacement and the stress are recorded, and the experimental results are shown in table 1.
Experimental example 2 hardness test
And (3) applying test force (initial test force F0 and total test force F0 and F1) to the surface of the tested material twice in sequence by using a standard pressure head, and pressing the pressure head into the surface of the sample under the action of the test force. After the total test force was maintained for a certain period of time, the main test force F1 was removed, the indentation depth was measured with the initial test force F0 maintained, and experimental data was recorded and collated as the difference between the indentation depth under the total test force and the indentation depth under the initial test force, and the experimental results are shown in table 2.
Table 1 results of tensile strength test of examples and comparative examples
Table 2 results of hardness testing for examples and comparative examples
| Group of | Hardness (HV) |
| Example 1 | 202 |
| Example 2 | 200 |
| Example 3 | 198 |
| Example 4 | 205 |
| Comparative example 1 | 183 |
| Comparative example 2 | 185 |
| Comparative example 3 | 179 |
| Comparative example 4 | 174 |
| Comparative example 5 | 176 |
| Comparative example 6 | 175 |
| Comparative example 7 | 181 |
| Comparative example 8 | 183 |
| Comparative example 9 | 172 |
| Comparative example 10 | 173 |
| Comparative example 11 | 180 |
| Comparative example 12 | 163 |
| Comparative example 13 | 179 |
From the above data, the following conclusions can be drawn:
Comparing the examples in tables 1 and 2 with the comparative examples, it can be seen from the comparison of example 4 with comparative example 1 and comparative example 2 that when the bending point of the pipe body is not 1/3 to 2/3 of the pipe body, the pipe body is easy to rebound, the physical properties of the pipe body are greatly affected, and particularly, the tensile strength is obviously affected, so that the tensile strength is obviously reduced. Comparing example 4 with comparative example 3 and comparative example 4, the length of the feed material is not 1/5 of the length of the tube shaft to 1/4 of the length of the tube shaft, which results in uneven hardness, which has a more remarkable effect on the hardness, and the effect is particularly remarkable when the feed rate is high.
As can be seen from comparative examples 4 and 5 to 7, the height and thickness ratio of the press convex hull and the thickness of the press convex hull are important to the present invention, and when the range of the press convex hull is not within the range selected in the present invention, deformation of the convex hull is caused, and the position of the convex hull is easily broken; meanwhile, the quality of the convex hull is easy to be uneven, and the hardness and the tensile strength of the convex hull are easy to be influenced.
As can be seen from comparison of example 4 with example 8 and comparative example 9, when the chamfer angle is too large, the prepared bent pipe is easy to be broken through by fluid in practical application, so that the tensile strength and the strength of the bent pipe are reduced; when the angle of the chamfer is too small, assembly becomes difficult or unstable, and it is difficult to achieve the effects of reducing stress and improving durability.
As can be seen from the comparison of the example 4 and the comparative examples 10-11, the pipe bending oil can effectively protect the pipe bending itself in the preparation process of the invention, and has good lubrication effect, so that the pipe bending oil can maintain hardness and tensile strength in the normal temperature bending process.
Finally, the example and the comparative example 12 are compared with the comparative example 13 in the processes of stamping forming and die casting, in order to improve the strength and the tensile strength of the finished bent pipe in the actual preparation process, the stamping forming needs to be subjected to heat treatment by adopting an electric welding process, and meanwhile, the interface of the prepared bent pipe is welded, so that the tensile strength and the strength of the finished bent pipe are unstable, the cost is high, and the technical effect of the invention cannot be achieved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (9)
1. The preparation method of the bent pipe is characterized by comprising the following steps of:
Selecting a cut pipe material, removing burrs at two ends of the pipe material, and performing ultrasonic treatment;
determining a bending point of the pipe material subjected to ultrasonic treatment, coating bent pipe oil at the bending point, and then bending by using a bending process to obtain a bent pipe;
Reaming the bent pipe;
Curling the cut of the bent pipe with the hole expanded into a rib or flanging the rib into a groove shape, and then pressing a convex hull at the pipe body;
and chamfering an angle a of the bent pipe with the pressed convex hull, and polishing again to obtain the finished product.
2. The method for manufacturing the bent pipe according to claim 1, wherein the bending point in the bending process is 1/3 of the pipe body to 2/3 of the pipe body;
Preferably, the bending point is 1/2 of the pipe body.
3. The method for manufacturing an elbow according to claim 1, wherein the elbow oil is composed of base oil: rust inhibitor: antioxidant volume ratio= (5-8): (0.1): (0.1);
The antirust agent is one or more of paraffin oil, stearic acid or oleic acid;
The antioxidant is one or more of butyl hydroxy anisole or dibutyl hydroxy toluene.
4. The method of manufacturing an elbow according to claim 1, wherein the ultrasonic frequency of the ultrasonic treatment is 20-25KHz.
5. The method for manufacturing the bent pipe according to claim 1, wherein in the bending process, the length of the pipe body is less than or equal to 1/5 of the length of the pipe body of each feeding.
6. The method for manufacturing the bent pipe according to claim 1, wherein the relation between the convex hull thickness T of the press convex hull and the convex hull height H is h= (4-5) T.
7. The method for manufacturing an elbow according to claim 1, wherein the minimum thickness of the press convex hull is 70% or more of the thickness of the tubing.
8. The method for manufacturing an elbow according to claim 1, wherein the angle of the chamfer a is 30 ° -60 °;
Preferably, the angle of the chamfer a is 45 °.
9. An elbow prepared by the method of preparing an elbow according to any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410373292.7A CN118143587A (en) | 2024-03-29 | 2024-03-29 | Preparation method of bent pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410373292.7A CN118143587A (en) | 2024-03-29 | 2024-03-29 | Preparation method of bent pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118143587A true CN118143587A (en) | 2024-06-07 |
Family
ID=91285322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410373292.7A Pending CN118143587A (en) | 2024-03-29 | 2024-03-29 | Preparation method of bent pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118143587A (en) |
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- 2024-03-29 CN CN202410373292.7A patent/CN118143587A/en active Pending
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