CN113634998A - Novel finned tube processing method without workpiece autorotation - Google Patents
Novel finned tube processing method without workpiece autorotation Download PDFInfo
- Publication number
- CN113634998A CN113634998A CN202110986577.4A CN202110986577A CN113634998A CN 113634998 A CN113634998 A CN 113634998A CN 202110986577 A CN202110986577 A CN 202110986577A CN 113634998 A CN113634998 A CN 113634998A
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- pipe
- finned tube
- processed
- coil pipe
- internal thread
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- 238000003672 processing method Methods 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000012545 processing Methods 0.000 claims abstract description 21
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 238000009987 spinning Methods 0.000 claims abstract description 5
- 238000003754 machining Methods 0.000 claims description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 230000033001 locomotion Effects 0.000 claims description 9
- 238000004381 surface treatment Methods 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 4
- 239000000110 cooling liquid Substances 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000002161 passivation Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 description 32
- 230000005540 biological transmission Effects 0.000 description 11
- 238000006073 displacement reaction Methods 0.000 description 9
- 230000003068 static effect Effects 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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Classifications
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- 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
Abstract
The invention discloses a novel finned tube processing method without autorotation of a workpiece, which comprises the steps of rolling and forming a tube blank to obtain a prefabricated coil; introducing one end of the prefabricated coil pipe into a straightening machine, and straightening the prefabricated coil pipe through the straightening machine; continuously reducing and drawing the prefabricated coil pipe through a drawing machine, and controlling the diameter and the wall thickness of the prefabricated coil pipe to obtain a pipe to be processed; sleeving a to-be-processed pipe on the long and thin core rod, driving the hydraulic chuck to rotate by the first servo motor, enabling the blade to revolve around the to-be-processed pipe, driving the pull rod to axially displace by the second servo motor, and enabling the blade to radially advance and retreat to process the outer fins of the to-be-processed pipe; the position of the long and thin core rod, which is located at the intersection point of the extension lines of the blades, is provided with an internal thread core head, and the pipe to be processed is deformed and extrudes the internal thread core head through the spinning of the blades, so that the internal thread core head is driven to rotate to process the internal thread. Through installing the blade on hydraulic chuck, hydraulic chuck is rotatory to make the blade around treating the revolution of processing tubular product, and the screw thread is extruded to the tubular product of treating processing to blade rotation simultaneously.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a finned tube machining method without coil rotation.
Background
The heat exchange tube based on the intensified heat transfer design is called a high-efficiency heat transfer tube, also called a finned tube. The existing method for processing the teeth of the finned tube generally adopts rolling equipment to drive a copper tube to rotate through autorotation of three groups of blades to extrude threads, the process is complex, and the copper tube has a plurality of problems in the processing process due to the processing mode: such as damage to the inner wall, processing of straight pipes only, limited length and low working efficiency.
Publication No. CN109732148B relates to a method of processing fin tube serrations, comprising the steps of: s1, feeding, namely enabling a pipe material to penetrate through a nylon spindle box and extend through a guide sleeve, and enabling one end of the pipe material to correspond to a disc cutter; s2, the feed position is adjusted in the radial direction, the three cutter radial transmission mechanisms simultaneously drive respective disc cutters to approach to the center, the first speed reducer is made to act by controlling the first motor, the output shaft of the first speed reducer drives the first sliding block upper plate and the second sliding block upper plate to move in the radial direction along the first linear guide rail piece and the second linear guide rail piece respectively through the coupler, the screw rod piece connected with the coupler in a matched mode and the screw nut matched with the screw rod piece, the working efficiency is high, the product quality is improved, and the machining process is complex.
Therefore, it is highly desirable to develop a new finned tube processing method without workpiece autorotation by those skilled in the art.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a novel finned tube processing method without workpiece autorotation.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows: a novel finned tube processing method without autorotation of workpieces comprises the following steps,
step 1, prefabricating a coil pipe, and rolling and forming a pipe blank to obtain the prefabricated coil pipe;
step 2: straightening, namely introducing one end of the prefabricated coil pipe into a straightening machine, and straightening the prefabricated coil pipe through the straightening machine;
and step 3: continuously reducing and drawing, namely continuously reducing and drawing the prefabricated coil pipe through a drawing machine, and controlling the diameter and the wall thickness of the prefabricated coil pipe to obtain a pipe to be processed;
and 4, step 4: the fin tube forming processing specifically comprises the following steps:
(i) the outer fin machining, namely sleeving a pipe to be machined on a long and thin core rod, driving a hydraulic chuck to rotate at a high speed by a first servo motor at the rotation speed of 2500-;
(ii) processing internal threads, wherein an internal thread core print is arranged at the position of the elongated core rod, which is positioned at the intersection point of the extension lines of the three groups of blades, and the internal thread core print is extruded by deforming the pipe to be processed through the spinning of the three groups of blades, so that the internal thread core print is driven to rotate, and the internal threads are processed;
and 5: sawing, namely sawing by using a sawing trolley in the motion process of the finned tube;
step 6: performing pressure test, namely performing pressure test on the finned tube after saw cutting, adding nitrogen into the finned tube for pressurizing, and maintaining the pressure for 15s without leakage;
and 7: surface treatment, namely removing dirt, grease and cooling liquid which are polluted in the machining process by surface treatment of the fin tube;
and 8: and packaging the finished product.
Preferably, in the step 4, the helix angle of the internal thread formed by the pipe to be processed is larger than the helix angle of the external fin.
Preferably, in the step 3, the drawing machine is a chain type continuous drawing machine.
Preferably, in the step 4, during the external fin machining process, the first servo motor drives the hydraulic chuck to rotate at the rotating speed of 3000 rpm.
Preferably, in the step 6, nitrogen is added into the finned tube to pressurize, and the pressure is kept at 2.0 MPa.
Preferably, in the step 7, the surface treatment process further includes passivation treatment to form a protective film on the surface of the finned tube.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a new processing mode, which utilizes a coil pipe to continuously process finned tubes, and processes such as prefabricating the coil pipe, straightening, continuously reducing and drawing, forming and processing finned tubes, sawing and cutting to form a production line for continuously processing the finned tubes, has high processing efficiency and easy industrialization, wherein the forming and processing of the finned tubes are realized by sleeving a tube to be processed on a slender core rod, a first servo motor drives a hydraulic chuck to rotate at high speed, three groups of blades revolve around the tube to be processed, a second servo motor drives a pull rod to axially displace, three groups of blades radially advance and retreat, the outer fins of the tube to be processed are processed, the tube to be processed deforms and extrudes an inner thread core head through spinning of the three groups of blades, the inner thread core head is driven to rotate, inner threads are processed, the forming effect of the outer fins and the inner threads of the finned tubes is improved, and the coil pipe does not generate a self-rotation state in the whole processing process, thereby ensuring no noise in the processing process and no damage to the inner wall of the fin tube.
Drawings
FIG. 1 is a schematic structural view of a fin forming mechanism according to the present invention.
Fig. 2 is a schematic structural view of the chuck rotation mechanism of the present invention.
FIG. 3 is a schematic structural view of an elongated mandrel of the present invention.
In the figure: 1. the automatic feeding device comprises a working table frame, 2 parts of a main shaft transmission device, 2 parts of a main shaft box, 2 parts of a first servo motor, 3 parts of a chuck rotating mechanism, 3 parts of a hydraulic chuck, 3 parts of a clamping jaw, 3 parts of a tool apron, 3 parts of a blade, 3 parts of a first synchronous pulley mechanism, 4 parts of a tool apron radial motion mechanism, 4 parts of a linear guide rail mechanism, 4 parts of a bearing seat, 4 parts of a nut seat, 4 parts of a fixed seat, 4 parts of a pull rod, 4 parts of a second servo motor, 4 parts of a second synchronous pulley mechanism, 5 parts of a displacement compensation mechanism, 5 parts of a static pressure guide rail, 5 parts of a displacement sensor, 6 parts of a long and thin core rod, 6 parts of an internal thread core head and 6 parts of a moving core head.
Detailed Description
The invention is further explained below with reference to the figures and examples.
And sequentially arranging the straightening machine, the chain type continuous drawing machine, the fin forming mechanism, the saw cutting trolley and the like to form a coil pipe continuous processing integral finned tube production line. The new workpiece is specifically a continuous coiled tube.
In particular to a novel finned tube processing method without autorotation of workpieces, which comprises the following steps,
step 1: prefabricating a coil pipe, and rolling and forming a pipe blank to obtain the prefabricated coil pipe;
step 2: straightening, namely introducing one end of the prefabricated coil pipe into a straightening machine, and straightening the prefabricated coil pipe through the straightening machine, wherein the straightening machine is the prior art;
and step 3: continuously reducing and drawing, namely continuously reducing and drawing the prefabricated coil pipe through a chain type continuous drawing machine, wherein the chain type continuous drawing machine is the prior art, and the diameter and the wall thickness of the prefabricated coil pipe are controlled to obtain a pipe to be processed;
and 4, step 4: utilizing a fin forming mechanism to form and process a fin tube, referring to fig. 1-3, the fin forming mechanism comprises a working table frame 1, a main shaft transmission device 2, a chuck rotating mechanism 3, a tool apron radial movement mechanism 4 and a displacement compensation mechanism 5, wherein the displacement compensation mechanism 5 comprises a static pressure guide rail 5-1 and a displacement sensor 5-2, the static pressure guide rail 5-1 is arranged on the working table frame 1, the displacement sensor 5-2 is adaptively arranged on one side of the static pressure guide rail 5-1, the main shaft transmission device 2 is arranged on the static pressure guide rail 5-1, the chuck rotating mechanism 3 is adaptively arranged at one end of the main shaft transmission device 2, the tool apron radial movement mechanism 4 is adaptively arranged at the other end of the main shaft transmission device 2, the chuck rotating mechanism 3, the main shaft transmission device 2 and the tool apron radial movement mechanism 4 are arranged in the same straight line direction, the method specifically comprises the following steps:
(i) the external fin machining is carried out, and the main shaft transmission device 2 comprises a main shaft box 2-1 and a first servo motor 2-2 arranged on the main shaft box; the chuck rotating mechanism 3 comprises a hydraulic chuck 3-1, clamping jaws 3-2 arranged on the hydraulic chuck 3-1, tool apron 3-3 arranged on the clamping jaws 3-2 and blades 3-4 arranged on the tool apron 3-3, the central line of each group of blades 3-4 forms a certain angle with the axis of a pipe to be processed, three groups of tool apron 3-3 are arranged on the clamping jaws 3-2 of the hydraulic chuck 3-1, the included angle of the axial central lines of the adjacent tool apron 3-3 is 120 degrees, a first servo motor 2-2 is in adaptive transmission connection with a main spindle box 2-1 through a first synchronous pulley mechanism 3-5, the main spindle box 2-1 drives a main spindle in the main spindle to enable the chuck rotating mechanism 3 to rotate, and the chuck rotating mechanism also comprises a long and thin core rod 6 penetrating through the main spindle transmission device 2, the chuck rotating mechanism 3 and the tool apron radial movement mechanism 4, sleeving a pipe to be processed on a long and thin core rod 6, driving a hydraulic chuck 3-1 to rotate at a high speed by a first servo motor 2-2, wherein the rotating speed is 3000 revolutions per minute, and three groups of blades 3-4 revolve around the pipe to be processed; the tool apron radial movement mechanism 4 comprises a linear guide rail mechanism 4-1, a bearing seat 4-2, a nut seat 4-3, a fixed seat 4-4 and a pull rod 4-5, the bearing seat 4-2, the nut seat 4-3 and the fixed seat 4-4 are arranged on the linear guide rail mechanism 4-1, two ends of the bearing seat 4-2 are provided with a plane bearing in a matching way, so that the advance and retreat of a blade 3-4 can be realized in the rotation process of the chuck rotation mechanism 3, the pull rod 4-5 is arranged in the bearing seat 4-2 and extends to the nut seat 4-3 and the fixed seat 4-4, a second servo motor 4-6 is also arranged above the fixed seat 4-4, the second servo motor 4-6 is in matching transmission connection with the pull rod 4-5 through a second synchronous pulley mechanism 4-7, the radial advance and retreat of the blades 3-4 is controlled by the axial displacement of the pull rod 4-5, the feed amount and the feed speed can be controlled at will by the second servo motor 4-6, so that the second servo motor 4-6 drives the pull rod 4-5 to move axially, and the three groups of blades 3-4 carry out radial advance and retreat, thereby processing the outer fins of the pipe to be processed;
(ii) processing internal threads, wherein an internal thread core print 6-1 is arranged at the position of the elongated core rod 6, which is positioned at the intersection point of the extension lines of the three groups of blades 3-4, a moving core print 6-2 for stretching is also arranged on the elongated core rod 6, the moving core print 6-2 is fixedly connected with a pull rod 4-5 in the stretching process, and the internal thread core print 6-1 is extruded by deforming the pipe to be processed through the spinning of the three groups of blades 3-4, so that the internal thread core print 6-1 is driven to rotate, and internal threads are processed;
the helical angle of the internal thread formed by the pipe to be processed is larger than the helical angle of the external fin;
and 5: sawing, namely sawing by using a sawing trolley in the motion process of the finned tube;
step 6: performing pressure test, namely performing pressure test on the finned tube after sawing, adding nitrogen into the finned tube for pressurizing, keeping the pressure at 2.0MPa, and keeping the pressure for 15s without leakage;
and 7: performing surface treatment, namely removing dirt, grease and cooling liquid which are infected in the machining process through the surface treatment of the fin tube, and then performing passivation treatment to form a protective film on the surface of the fin tube;
and 8: and packaging the finished product.
The problem that the fin forming speed and the reducing drawing speed cannot be controlled to be consistent is solved through the displacement compensation mechanism in the machining process, the friction coefficient of the hydrostatic guide rail is almost negligible and is different from common hard rails and linear guide rails, the friction coefficient is large, the position of a sliding table on the hydrostatic guide rail is monitored through the displacement sensor, and the position is fed back in real time, so that the rotating speeds of the first servo motor and the second servo motor are adjusted, and the speed difference between the fin forming and the reducing drawing speed is compensated.
The foregoing is illustrative and explanatory of the invention and is not intended to limit the advantages attainable thereby, and it is within the scope of the present application for any one or more of the advantages to be realized, whether simple changes in construction and/or implementation in some embodiments are possible in the practice of the invention.
Claims (6)
1. A novel finned tube processing method without autorotation of workpieces is characterized in that: comprises the following steps of (a) carrying out,
step 1: prefabricating a coil pipe, and rolling and forming a pipe blank to obtain the prefabricated coil pipe;
step 2: straightening, namely introducing one end of the prefabricated coil pipe into a straightening machine, and straightening the prefabricated coil pipe through the straightening machine;
and step 3: continuously reducing and drawing, namely continuously reducing and drawing the prefabricated coil pipe through a drawing machine, and controlling the diameter and the wall thickness of the prefabricated coil pipe to obtain a pipe to be processed;
and 4, step 4: the fin tube forming processing specifically comprises the following steps:
(i) the outer fin machining, namely sleeving a to-be-machined pipe on a long and thin core rod (6), driving a hydraulic chuck (3-1) to rotate at a high speed by a first servo motor (2-2), wherein the rotating speed is 2500 plus 3500 rpm, revolving three groups of blades (3-4) around the to-be-machined pipe, and simultaneously driving a pull rod (4-5) to axially displace by a second servo motor (4-6), so that the three groups of blades (3-4) radially advance and retreat to machine the outer fin of the to-be-machined pipe;
(ii) processing internal threads, wherein an internal thread core print (6-1) is arranged at the position, located at the intersection point of the extension lines of the three groups of blades (3-4), of the long and thin core rod (6), and the to-be-processed pipe deforms and extrudes the internal thread core print (6-1) through spinning of the three groups of blades (3-4), so that the internal thread core print (6-1) is driven to rotate, internal threads are processed, and the finned pipe is obtained;
and 5: sawing, namely sawing by using a sawing trolley in the motion process of the finned tube;
step 6: performing pressure test, namely performing pressure test on the finned tube after saw cutting, adding nitrogen into the finned tube for pressurizing, and maintaining the pressure for 15s without leakage;
and 7: surface treatment, namely removing dirt, grease and cooling liquid which are polluted in the machining process by surface treatment of the fin tube;
and 8: and packaging the finished product.
2. The novel workpiece non-autorotation finned tube machining method as claimed in claim 1, wherein: in the step 4, the helix angle of the internal thread formed by the pipe to be processed is larger than the helix angle of the external fin.
3. The novel workpiece non-autorotation finned tube machining method as claimed in claim 1, wherein: in the step 3, the drawing machine is a chain type continuous drawing machine.
4. The novel workpiece non-autorotation finned tube machining method as claimed in claim 1, wherein: in the step 4, in the outer fin machining process, the first servo motor (2-2) drives the hydraulic chuck (3-1) to rotate at the rotating speed of 3000 revolutions per minute.
5. The novel workpiece non-autorotation finned tube machining method as claimed in claim 1, wherein: in the step 6, nitrogen is added into the finned tube to pressurize, and the pressure is kept at 2.0 MPa.
6. The novel workpiece non-autorotation finned tube machining method as claimed in claim 1, wherein: in the step 7, the surface treatment process further comprises passivation treatment, and a protective film is formed on the surface of the fin tube.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110986577.4A CN113634998B (en) | 2021-08-26 | 2021-08-26 | Finned tube processing method without workpiece autorotation |
| PCT/CN2022/084084 WO2023024509A1 (en) | 2021-08-26 | 2022-03-30 | New finned tube machining method without self-rotation of workpiece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110986577.4A CN113634998B (en) | 2021-08-26 | 2021-08-26 | Finned tube processing method without workpiece autorotation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113634998A true CN113634998A (en) | 2021-11-12 |
| CN113634998B CN113634998B (en) | 2023-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110986577.4A Active CN113634998B (en) | 2021-08-26 | 2021-08-26 | Finned tube processing method without workpiece autorotation |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113634998B (en) |
| WO (1) | WO2023024509A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023024509A1 (en) * | 2021-08-26 | 2023-03-02 | 泰州驰骏智能设备有限公司 | New finned tube machining method without self-rotation of workpiece |
| CN115945605A (en) * | 2023-03-14 | 2023-04-11 | 江苏萃隆精密铜管股份有限公司 | Extrusion type high finned tube forming equipment |
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- 2021-08-26 CN CN202110986577.4A patent/CN113634998B/en active Active
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2022
- 2022-03-30 WO PCT/CN2022/084084 patent/WO2023024509A1/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106391914A (en) * | 2016-11-10 | 2017-02-15 | 华南理工大学 | Rolling and ploughing-extrusion device and method for manufacturing three-dimensional internal and external finned tubes |
| WO2018086528A1 (en) * | 2016-11-10 | 2018-05-17 | 华南理工大学 | Device and method for forming three-dimensional internally finned pipe based on multiple-blade ploughing and extrusion |
| CN106802103A (en) * | 2016-12-29 | 2017-06-06 | 广东龙丰精密铜管有限公司 | A kind of inside and outside fin multiple tube and its processing method |
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| WO2023024509A1 (en) * | 2021-08-26 | 2023-03-02 | 泰州驰骏智能设备有限公司 | New finned tube machining method without self-rotation of workpiece |
| CN115945605A (en) * | 2023-03-14 | 2023-04-11 | 江苏萃隆精密铜管股份有限公司 | Extrusion type high finned tube forming equipment |
| CN115945605B (en) * | 2023-03-14 | 2023-05-23 | 江苏萃隆精密铜管股份有限公司 | Extrusion type high-fin tube forming equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113634998B (en) | 2023-02-07 |
| WO2023024509A1 (en) | 2023-03-02 |
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Denomination of invention: A method for machining finned tubes without self rotation of workpieces Granted publication date: 20230207 Pledgee: Bank of China Limited Taizhou Hailing sub branch Pledgor: TAIZHOU CHIJUN INTELLIGENT EQUIPMENT CO.,LTD. Registration number: Y2024980005763 |
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