CN112008095A - Machining method of helicopter fuel oil discharge pipe - Google Patents
Machining method of helicopter fuel oil discharge pipe Download PDFInfo
- Publication number
- CN112008095A CN112008095A CN202010744125.0A CN202010744125A CN112008095A CN 112008095 A CN112008095 A CN 112008095A CN 202010744125 A CN202010744125 A CN 202010744125A CN 112008095 A CN112008095 A CN 112008095A
- Authority
- CN
- China
- Prior art keywords
- discharge pipe
- centering
- helicopter
- oil discharge
- fuel oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000295 fuel oil Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000003754 machining Methods 0.000 title claims description 15
- 238000012545 processing Methods 0.000 claims abstract description 5
- 239000000446 fuel Substances 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 4
- 230000003746 surface roughness Effects 0.000 claims description 3
- 239000010687 lubricating oil Substances 0.000 claims description 2
- 239000003921 oil Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 5
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 abstract description 2
- 238000005520 cutting process Methods 0.000 description 6
- 238000012797 qualification Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B1/00—Methods for turning or working essentially requiring the use of turning-machines; Use of auxiliary equipment in connection with such methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q2703/00—Work clamping
- B23Q2703/02—Work clamping means
- B23Q2703/10—Devices for clamping workpieces of a particular form or made from a particular material
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Turning (AREA)
Abstract
The invention discloses a method for processing a fuel oil discharge pipe of a helicopter, which eliminates the bending and twisting deformation of parts caused by the screwing of nuts by canceling the original axial compression mode; according to the method, the helicopter fuel oil discharge pipe is installed and positioned by adopting the centering clamp, so that the helicopter fuel oil discharge pipe is highly overlapped with the rotation center of the lathe and is only subjected to radial force and matching surface friction force, the integral rigidity and strength of parts during turning are enhanced, and the clamping deformation is controlled to be minimum. The height coincidence of the parts and the turning center of the lathe is ensured, and the clamping deformation caused by excessive positioning of the clamped parts is avoided. The design precision of parts is met, and meanwhile, the processing qualified rate of the parts is greatly improved.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a machining method of a helicopter fuel oil discharge pipe.
Background
The fuel oil discharge pipe belongs to a thin and long thin-wall pipe part, is made of softer aluminum alloy 6061, and is provided with a plurality of vertically crossed oil discharge through holes on a base body structure. Due to the factors, the fuel oil discharge pipe has poor rigidity and weak strength, the positioning, clamping and machining are easy to deform, the precision requirement and quality of parts are difficult to ensure, and particularly the position degree of the outer diameter of the small end to the reference of the large end is not qualified from machining, so that the qualification rate of the parts is 0.
Disclosure of Invention
Object of the Invention
The invention provides a method for controlling machining deformation of a helicopter fuel oil discharge pipe, which can reduce the deformation degree of a helicopter fuel oil discharge pipe part in machining and machine a product with high qualification rate so as to solve the technical problem of low product qualification rate caused by the fact that the helicopter fuel oil discharge pipe part is easy to deform in the machining process at present.
Technical solution of the invention
A method for processing a helicopter fuel oil discharge pipe comprises the steps of installing and positioning the helicopter fuel oil discharge pipe by a centering clamp, and canceling an original clamping mode of axially screwing a nut, so that not only can the integral rigidity and strength of the helicopter fuel oil discharge pipe be enhanced, but also the helicopter fuel oil discharge pipe is enabled to be highly overlapped with a turning center of a lathe when finish turning is carried out on the helicopter fuel oil discharge pipe, and only radial force and friction force of matching surfaces of the helicopter fuel oil discharge pipe and the centering clamp are applied.
Preferably, the centering fixture penetrates through an inner hole of the fuel oil discharge pipe, the outer circumferential surface of the centering fixture is in clearance fit with the inner hole of the large end of the fuel oil discharge pipe of the helicopter, the rest parts of the centering fixture are not in contact with the inner hole of the fuel oil discharge pipe of the helicopter, one end of the centering fixture is centered through the three-jaw chuck, the end surface of the other end of the centering fixture is provided with a center hole coaxial with the centering fixture, and the center hole is supported and positioned by the lathe center in. The auxiliary support of the center is to control the tightening force to the minimum by adjusting the position of the center of the lathe, thereby eliminating the bending deformation of the clamp. The axial screwing of the original nut is cancelled, and the bending and twisting deformation caused by over-positioning installation are avoided while the axial stress of the part is eliminated, so that the clamping deformation of the nut is minimized.
Preferably, the clearance between the outer circumferential surface of the centering clamp and the inner hole of the large end of the helicopter fuel oil discharge pipe is 0.005-0.01 mm, so that the helicopter fuel oil discharge pipe is highly overlapped with the rotation center of the lathe and is only subjected to radial force and the friction force between the matching surfaces of the helicopter fuel oil discharge pipe and the centering clamp.
Preferably, the method comprises the steps of:
roughly machining each molded surface of a helicopter fuel oil discharge pipe, and reserving at least 1.0mm of allowance for each molded surface;
step two, finely turning an inner hole of the helicopter fuel oil discharge pipe to a final size;
step three, according to the size of the inner hole at the large end of the helicopter fuel oil discharge pipe in the step two, matching a centering clamp;
assembling a centering clamp on the lathe, positioning an inner hole at the large end of the helicopter fuel oil discharge pipe on the excircle of the centering clamp in a matching way, centering one end of the centering clamp through a three-jaw chuck, and supporting a center hole on the centering clamp through the center of the lathe at the other end in an auxiliary way to ensure that the positioning rotation center of the centering clamp and the helicopter fuel oil discharge pipe is superposed with the rotation center of the lathe, and finish turning all profiles of the helicopter fuel oil discharge pipe except for threads;
fifthly, an external thread is arranged at one end of a centering clamp mounting center, a nut is mounted at the end, and the external diameter of the thread of the helicopter fuel oil discharge pipe is finely turned;
and step six, removing the centering fixture and the lathe center, and cleaning the part.
Preferably, the surface roughness of the inner hole of the large end of the helicopter fuel oil discharge pipe and the matching part of the centering clamp and the inner hole of the large end of the helicopter fuel oil discharge pipe is Ra0.8-Ra1.6.
Preferably, in the fourth step, a dial indicator is arranged on the positioning surface of the centering fixture, so that when the dial indicator rotates along with the three-jaw chuck, the display pointer changes to zero, and the rotation center of the centering fixture is overlapped with the rotation center of the lathe.
Preferably, in the fifth step, dial indicators are arranged on the finish turning outer surface at the two ends and the middle of the helicopter fuel oil discharge pipe, so that when the dial indicators rotate along with the three-jaw chuck, the display pointer changes to zero, thereby centering the part and controlling the tightening force of the nut.
Preferably, lubricating oil is uniformly coated on the center hole of the centering clamp and the center of the lathe in the fifth step and the sixth step so as to reduce friction and abrasion and improve positioning stability.
The invention has the advantages that: the bending and twisting deformation of the part caused by the screwing of the nut is eliminated by canceling the original axial compression mode; and the whole rigidity and strength of the part during turning are enhanced by means of centering according to a method of matching the outer diameter of the centering clamp and the mode of the lathe center auxiliary support, so that the clamping deformation is controlled to be minimum. The height coincidence of the parts and the turning center of the lathe is ensured, and the clamping deformation caused by excessive positioning of the clamped parts is avoided. The design precision of parts is met, and meanwhile, the processing qualified rate of the parts is greatly improved.
Drawings
FIG. 1 is a schematic view of positioning and clamping a fuel discharge pipe of a helicopter.
In the figure: 1-a helicopter fuel oil discharge pipe and 2-a centering clamp.
Detailed Description
The invention is realized by the following technical scheme.
A machining method of a fuel oil discharge pipe of a helicopter comprises the following steps:
roughly machining each molded surface of a helicopter fuel oil discharge pipe 1, and reserving at least 1.0mm of allowance for each molded surface;
step two, finely turning an inner hole of the helicopter fuel oil discharge pipe 1 to a final size;
step three, according to the size of the inner hole at the large end of the helicopter fuel oil discharge pipe 1 in the step two, matching a centering clamp 2;
and fourthly, assembling a centering clamp 2 on a lathe, matching and positioning the large-end inner hole of the helicopter fuel oil discharge pipe 1 on the outer circle of the centering clamp 2, controlling the matching clearance between the large-end inner hole of the helicopter fuel oil discharge pipe 1 and the outer circle 2 of the centering clamp to be 0.005 mm-0.01 mm, and controlling the surface roughness of two matching surfaces to be less than Ra1.6, preferably Ra0.8-Ra1.6, and simultaneously stably fixing the helicopter fuel oil discharge pipe 1 on the centering clamp 2 through the friction force between the matching surfaces of the helicopter fuel oil discharge pipe 1 and the centering clamp 2, thereby avoiding the bending and distortion caused by screwing and fastening by nuts. One end of the centering clamp 2 is centered through the three-jaw chuck, and the other end of the centering clamp supports a center hole on the centering clamp 2 through the center of a lathe to make the positioning rotation center of the centering clamp 2 and the helicopter fuel oil discharge pipe 1 coincide with the rotation center of the lathe, and finish turning all profiles of the helicopter fuel oil discharge pipe 1 except threads;
in the fourth step, the centering clamp 2 is firstly installed on a lathe, the jump of the installation matching surface of the centering clamp is checked by a dial indicator, and the centering clamp 2 is adjusted at any time. When the run-out is zero, the centering fixture 2 is adjusted to the centre of rotation of the lathe. And then the helicopter fuel oil discharge pipe 1 is arranged on the centering clamp 2. And adjusting the center of the lathe, and controlling the relative position of the center hole of the centering clamp 2 and the center of the lathe so as to achieve the purpose of auxiliary support of the centering clamp 2. By means of the positioning and mounting, the helicopter fuel oil discharge pipe 1 is overlapped with the rotation center of a lathe spindle when being turned, and the helicopter fuel oil discharge pipe 2 is only subjected to radial supporting force of the matching surface of the centering clamp and friction force between the helicopter fuel oil discharge pipe 2 and the centering clamp 2, axial deformation is minimum, and therefore the turning qualified rate of parts is improved.
And (3) cutting the helicopter fuel oil discharge pipe 1 to a depth of 0.1mm per cutter when all profiles except the threads are finely turned. Because the cutting depth can produce big cutting force when big, can overcome the frictional force of centering anchor clamps 2 and helicopter fuel oil discharge pipe 1 fitting surface, make part and centering anchor clamps 2 produce relative rotation, consequently it is more reasonable to select little cutting depth, and cutting deformation is also littleer, can guarantee that the position degree (0.03mm) of helicopter fuel oil discharge pipe 2 tip external diameter to the main aspects benchmark is processed qualified.
And fifthly, one end of a centering fixture mounting center is provided with an external thread, a nut is mounted at the end, the external diameter of the thread of the helicopter fuel oil discharge pipe is finely turned, and dial indicators are arranged on the finely turned external surfaces at the two ends and the middle part of the helicopter fuel oil discharge pipe, so that when the helicopter fuel oil discharge pipe rotates along with the three-jaw chuck, the display indicator changes to zero, and the part is centered and the tightening force of the nut is controlled. And (5) controlling the outer diameter runout of the two ends and the middle position of the part within 0.02mm, and turning external threads. Because the tolerance of the position degree of the thread is larger, the requirement on axial deformation is lower, and the axial pressing force can be increased when the nut is screwed down, so that the position degree requirement of the thread can be ensured, and the phenomenon that the part and the clamp rotate relatively to cause thread disordering due to large cutting force of a thread lathe can be avoided.
And step six, removing the centering fixture and the lathe center, and cleaning the part.
And step eight, removing the positioning device and cleaning the parts.
The above-mentioned embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the same, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (8)
1. A method for processing a helicopter fuel oil discharge pipe is characterized in that the helicopter fuel oil discharge pipe is installed and positioned by adopting a centering clamp, so that the helicopter fuel oil discharge pipe is highly overlapped with the rotation center of a lathe and only bears radial force and matching surface friction force.
2. The method of claim 1, wherein the centering fixture passes through an inner hole of the fuel drain pipe, an outer circumferential surface of the centering fixture is in clearance fit with the inner hole of the large end of the fuel drain pipe of the helicopter, the rest of the centering fixture is not in contact with the inner hole of the fuel drain pipe of the helicopter, one end of the centering fixture is centered by the three-jaw chuck, the other end of the centering fixture is provided with a center hole coaxial with the centering fixture, and the centering fixture is supported and positioned by a lathe center.
3. The method of claim 2, wherein the clearance between the outer circumferential surface of the centering fixture and the inner hole of the large end of the helicopter fuel discharge pipe is 0.005mm to 0.01 mm.
4. A method of manufacturing a helicopter fuel drain pipe according to claim 2,
the method comprises the following steps:
roughly machining each molded surface of a helicopter fuel oil discharge pipe, and reserving at least 1.0mm of allowance for each molded surface;
step two, finely turning an inner hole of the helicopter fuel oil discharge pipe to a final size;
step three, according to the size of the inner hole at the large end of the helicopter fuel oil discharge pipe in the step two, matching a centering clamp;
assembling a centering clamp on the lathe, positioning an inner hole at the large end of the helicopter fuel oil discharge pipe on the excircle of the centering clamp in a matching way, centering one end of the centering clamp through a three-jaw chuck, and supporting a center hole on the centering clamp through the center of the lathe at the other end in an auxiliary way to ensure that the positioning rotation center of the centering clamp and the helicopter fuel oil discharge pipe is superposed with the rotation center of the lathe, and finish turning all profiles of the helicopter fuel oil discharge pipe except for threads;
fifthly, mounting a nut at one end of a centering clamp mounting center, and finish turning the external diameter of the thread of the helicopter fuel oil discharge pipe;
and step six, removing the centering fixture and the lathe center, and cleaning the part.
5. The method of claim 2, wherein the surface roughness of the portion of the helicopter fuel discharge pipe large end inner bore and the centering fixture that engages the helicopter fuel discharge pipe large end inner bore is Ra0.8-Ra1.6.
6. A method for machining a fuel discharge pipe of a helicopter as set forth in claim 5, wherein in step four, the rotation center of the centering jig coincides with the rotation center of the lathe by providing a dial indicator on the positioning surface of the centering jig so that the dial indicator changes to zero when rotating with the three-jaw chuck.
7. A method for manufacturing a helicopter fuel drain pipe according to claim 5, wherein in step five, dial indicators are arranged on the finish turning outer surface of the two ends and the middle of the helicopter fuel drain pipe, so that when the dial indicators rotate along with the three-jaw chuck, the dial indicators change to zero, thereby centering the parts and controlling the tightening force of the nut.
8. The method for machining the oil drain pipe of the helicopter fuel as claimed in claim 5, wherein the method comprises the following steps: and step five and step six, uniformly coating lubricating oil on a center hole on the centering fixture and the center of the lathe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010744125.0A CN112008095A (en) | 2020-07-29 | 2020-07-29 | Machining method of helicopter fuel oil discharge pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010744125.0A CN112008095A (en) | 2020-07-29 | 2020-07-29 | Machining method of helicopter fuel oil discharge pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112008095A true CN112008095A (en) | 2020-12-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010744125.0A Pending CN112008095A (en) | 2020-07-29 | 2020-07-29 | Machining method of helicopter fuel oil discharge pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112008095A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101003114A (en) * | 2007-01-12 | 2007-07-25 | 辽河石油勘探局 | Digital control method for manufacturing thin wall parts |
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| CN102601405A (en) * | 2012-03-30 | 2012-07-25 | 苏州唐峰电器有限公司 | Automatic centering and clamping device |
| CN203184684U (en) * | 2013-03-07 | 2013-09-11 | 连云港职业技术学院 | Numerical control lathe fixture of thin-wall barrel-shaped workpiece |
| CN104400334A (en) * | 2014-10-16 | 2015-03-11 | 中国科学院上海技术物理研究所 | Lathe precise machining method for ultrathin-wall-thickness metal pipe part |
| CN105414890A (en) * | 2015-11-24 | 2016-03-23 | 沈阳黎明航空发动机(集团)有限责任公司 | Finish machining method for thin-walled conduit |
| CN206415616U (en) * | 2016-12-12 | 2017-08-18 | 太原航空仪表有限公司 | A kind of telescopic bellows component integrated screw processing unit (plant) |
| CN206662820U (en) * | 2017-03-31 | 2017-11-24 | 四川航天职业技术学院 | Process the fixture of Model For The Bush-axle Type Parts |
| CN107414100A (en) * | 2017-07-31 | 2017-12-01 | 新兴能源装备股份有限公司 | The turning tool and processing method of a kind of thin-walled cylindrical workpiece |
| CN208116805U (en) * | 2018-03-06 | 2018-11-20 | 南通安泰新材料科技有限公司 | A kind of clamping position tooling of target pipe end thread chasing machine |
-
2020
- 2020-07-29 CN CN202010744125.0A patent/CN112008095A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101003114A (en) * | 2007-01-12 | 2007-07-25 | 辽河石油勘探局 | Digital control method for manufacturing thin wall parts |
| JP2008207275A (en) * | 2007-02-26 | 2008-09-11 | Okuma Corp | Turret tool post and machine tool |
| CN102601405A (en) * | 2012-03-30 | 2012-07-25 | 苏州唐峰电器有限公司 | Automatic centering and clamping device |
| CN203184684U (en) * | 2013-03-07 | 2013-09-11 | 连云港职业技术学院 | Numerical control lathe fixture of thin-wall barrel-shaped workpiece |
| CN104400334A (en) * | 2014-10-16 | 2015-03-11 | 中国科学院上海技术物理研究所 | Lathe precise machining method for ultrathin-wall-thickness metal pipe part |
| CN105414890A (en) * | 2015-11-24 | 2016-03-23 | 沈阳黎明航空发动机(集团)有限责任公司 | Finish machining method for thin-walled conduit |
| CN206415616U (en) * | 2016-12-12 | 2017-08-18 | 太原航空仪表有限公司 | A kind of telescopic bellows component integrated screw processing unit (plant) |
| CN206662820U (en) * | 2017-03-31 | 2017-11-24 | 四川航天职业技术学院 | Process the fixture of Model For The Bush-axle Type Parts |
| CN107414100A (en) * | 2017-07-31 | 2017-12-01 | 新兴能源装备股份有限公司 | The turning tool and processing method of a kind of thin-walled cylindrical workpiece |
| CN208116805U (en) * | 2018-03-06 | 2018-11-20 | 南通安泰新材料科技有限公司 | A kind of clamping position tooling of target pipe end thread chasing machine |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20201201 |