CN110695376A - Green precision turning method for large length-diameter ratio needle valve coupling shaft neck - Google Patents
Green precision turning method for large length-diameter ratio needle valve coupling shaft neck Download PDFInfo
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- CN110695376A CN110695376A CN201910976306.3A CN201910976306A CN110695376A CN 110695376 A CN110695376 A CN 110695376A CN 201910976306 A CN201910976306 A CN 201910976306A CN 110695376 A CN110695376 A CN 110695376A
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- Prior art keywords
- needle valve
- journal
- diameter
- turning
- coupling
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- 230000008878 coupling Effects 0.000 title claims abstract description 44
- 238000010168 coupling process Methods 0.000 title claims abstract description 44
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 44
- 238000007514 turning Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000003754 machining Methods 0.000 claims abstract description 22
- 238000005520 cutting process Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 230000003746 surface roughness Effects 0.000 claims description 4
- GJNGXPDXRVXSEH-UHFFFAOYSA-N 4-chlorobenzonitrile Chemical compound ClC1=CC=C(C#N)C=C1 GJNGXPDXRVXSEH-UHFFFAOYSA-N 0.000 claims description 3
- 239000002173 cutting fluid Substances 0.000 abstract description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
- B23B5/06—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning valves or valve bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
- B23B5/08—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning axles, bars, rods, tubes, rolls, i.e. shaft-turning lathes, roll lathes; Centreless turning
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
The invention discloses a green precision turning method for a large length-diameter ratio needle valve coupling journal, which is over-weighed as follows: roughly machining and forming the needle valve coupling piece on a longitudinal cutting machine tool at one time, and clamping the needle valve coupling piece on a precise three-jaw chuck after heat treatment to measure the needle valve bounce swing error; according to the position of neck, turning needle valve spring mounting journal, needle valve spring holder coupling journal along needle valve idol length direction in the needle valve, utilize miniature precision support frame to lift neck in the needle valve, turning needle valve spring mounting journal diameter to finger scale cun, then remove miniature precision support frame to needle valve spring mounting journal, turn needle valve spring holder coupling journal diameter, needle valve in proper order neck diameter to finger scale cun. According to the invention, the axial deformation of the needle valve with large length-diameter ratio is reduced by changing the processing position of the needle valve journal during cutting, the use of cutting fluid is avoided by high-speed hard turning to reduce environmental pollution, and the process requirements are met.
Description
Technical Field
The invention belongs to the technical field of machining, and relates to a green precision turning method for a large length-diameter ratio needle valve coupling journal.
Background
The flow chart of the traditional processing process of the needle valve coupling journal of the high-pressure common rail fuel injector is shown in figure 1, the needle valve coupling journal is subjected to semi-fine grinding on a precise cylindrical grinding machine, in order to reduce deformation caused by grinding resistance acting on materials as much as possible during grinding, grinding processing can be carried out only by multiple cutters, and in the processing process, the size needs to be detected for multiple times, and the grinding feed allowance needs to be adjusted at any time to ensure the processing precision. Meanwhile, as the high-pressure common rail oil injector adopts the structural design of the needle valve without oil return with large length-diameter ratio, as shown in figure 2, the needle valve guide shaft adopts a triangular structure, the length is 88.1mm, the needle valve spring mounting shaft neck phi is 2.8mm0-0.03, the middle neck phi is 4.5mm +/-0.03, and the length-diameter ratio is 31/19.5 times respectively. The deformation of the needle valve after the semi-fine grinding is about 0.01mm-0.02mm, which causes certain influence on the fine grinding and seriously influences the processing precision of parts. Therefore, straightening treatment is needed after rough grinding/semi-finish grinding, the deformation of parts is reduced, and the needle valve machining production efficiency is low.
Disclosure of Invention
Objects of the invention
The purpose of the invention is: the method for green precision turning of the large length-diameter ratio needle valve coupling journal solves the problems of low efficiency, long process and large deformation of grinding machining of the large length-diameter ratio needle valve coupling journal in semi-precision grinding machining.
(II) technical scheme
In order to solve the technical problem, the invention provides a green precision turning method for a large length-diameter ratio needle valve coupling journal, which comprises the following steps of:
the first step is as follows: roughing forming of needle valve matching parts
Roughly machining and forming the needle valve coupling piece on a longitudinal cutting machine tool at one time, and clamping the needle valve coupling piece on a precise three-jaw chuck after heat treatment to measure the needle valve bounce swing error;
the second step is that: turning the diameter of the middle neck of the needle valve, the mounting journal of the needle valve spring and the coupling journal of the needle valve spring seat to meet the index requirement
According to the position of neck, turning needle valve spring mounting journal, needle valve spring holder coupling journal along needle valve idol length direction in the needle valve, utilize miniature precision support frame to lift neck in the needle valve, turning needle valve spring mounting journal diameter to finger scale cun, then remove miniature precision support frame to needle valve spring mounting journal, turn needle valve spring holder coupling journal diameter, needle valve in proper order neck diameter to finger scale cun.
And in the second step, a 45-degree outer circle turning tool is adopted during turning, and the blade is a PCBN blade.
Wherein the blade angles are respectively: the front angle is-6 degrees, the blade inclination angle is-6 degrees, and the main deflection angle is 45 degrees.
Wherein the arc radius of the knife tip is r epsilon 0.8 mm.
Wherein, the turning process adopts hard turning.
Wherein the cutting speed of the main shaft for mounting the turning tool is 200m/min, the feed rate is 0.02-0.05mm/r, and the cutting depth is 0.05 mm.
Wherein, the surface roughness of the machined part is less than or equal to Ra0.4, and the shaft neck runout is less than or equal to 0.03 mm.
(III) advantageous effects
According to the green precision turning method for the large-length-diameter-ratio needle valve coupling shaft neck, rough grinding/semi-finish grinding is replaced by turning the large-length-diameter-ratio needle valve coupling shaft neck, the machining process flow is reasonably arranged, the machining position of the needle valve shaft neck during cutting is changed, the axial deformation of the large-length-diameter-ratio needle valve is reduced, cutting fluid is prevented from being used through high-speed hard turning to reduce environmental pollution, the machining process of a part is controlled by selecting a proper machining tool and reasonable cutting parameters to guarantee the machining precision and the surface roughness of the part, and the technological requirements are met.
Drawings
FIG. 1 is a flow chart of a conventional high-pressure common rail injector needle coupling journal processing technique.
FIG. 2 is a schematic view of a large length to diameter ratio needle valve coupling journal.
FIG. 3 is a flow chart of the processing technology of the high-pressure common rail injector needle valve coupling journal of the invention.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The invention aims at the extremely strict manufacturing requirements of the size and the precision of the high-pressure common rail fuel injector needle valve coupling journal, and realizes that the processing size and the form and position tolerance of the large length-diameter ratio needle valve coupling journal can reach the index requirements of semi-fine grinding by adopting high-precision turning to replace the traditional rough grinding/semi-fine grinding processing technique.
In this embodiment, the needle valve material is GCr15, belongs to high alloy steel, and the machining index is: needle valve spring mounting journal phi 2.8mm (0, -0.03), needle valve middle neck phi 4.5mm +/-0.03, needle valve spring seat coupling journal phi 4.5mm (-0.002, -0.004)
The processing process diagram is shown in fig. 3, and comprises the following steps:
the first step is as follows: roughing forming of needle valve matching parts
The rough machining and forming of the needle valve coupling piece are completed in one step by a longitudinal cutting machine tool, and the needle valve coupling piece is clamped on a precision three-jaw chuck after heat treatment to measure the needle valve bounce swing error.
The second step is that: turning the diameter of the middle neck of the needle valve, the mounting journal of the needle valve spring and the coupling journal of the needle valve spring seat to meet the index requirement
According to the position of neck, turning needle valve spring mounting journal, needle valve spring holder coupling journal along needle valve idol length direction in the needle valve, utilize miniature precision support frame to lift neck in the needle valve, turning needle valve spring mounting journal diameter to finger scale cun, then remove miniature precision support frame to needle valve spring mounting journal, turn needle valve spring holder coupling journal diameter, needle valve in proper order neck diameter to finger scale cun.
Adopt 45 excircle lathe tools during turning, the blade adopts the PCBN blade, and the blade angle is respectively: the front angle is-6 degrees, the blade inclination angle is-6 degrees, the main deflection angle is 45 degrees, and the arc radius of the tool nose is r epsilon is 0.8 mm.
The hard turning technology is adopted during turning, the cutting speed of a main shaft for mounting the turning tool is 200m/min, the feed rate is 0.02-0.05mm/r, and the cutting depth is 0.05 mm. The surface roughness of the machined part is less than or equal to Ra0.4, and the shaft neck bounce is less than or equal to 0.03 mm.
According to the technical scheme, the machining process is adopted, the rough grinding/semi-finish grinding machining is replaced by the machining of the needle valve coupling shaft neck with the large length-diameter ratio by turning, and the straightening process is eliminated, so that the machining takt is remarkably reduced, the production efficiency can be improved by more than 30%, the machining precision of the machined needle valve is superior to that of grinding, the process requirement of parts is effectively guaranteed, and the product quality is improved. Cutting fluid is not needed in the processing, so that the processing cost is reduced, and the environmental pollution is reduced; meanwhile, numerical control machining is adopted, so that the influence of human factors on the machining quality of parts is eliminated, the consistency of the machining size and precision of the parts is ensured, and the labor intensity of operators is reduced.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The green precision turning method for the large-length-diameter-ratio needle valve coupling shaft neck is characterized by comprising the following steps of:
the first step is as follows: roughing forming of needle valve matching parts
Roughly machining and forming the needle valve coupling piece on a longitudinal cutting machine tool at one time, and clamping the needle valve coupling piece on a precise three-jaw chuck after heat treatment to measure the needle valve bounce swing error;
the second step is that: turning the diameter of the middle neck of the needle valve, the mounting journal of the needle valve spring and the coupling journal of the needle valve spring seat to meet the index requirement
According to the position of neck, turning needle valve spring mounting journal, needle valve spring holder coupling journal along needle valve idol length direction in the needle valve, utilize miniature precision support frame to lift neck in the needle valve, turning needle valve spring mounting journal diameter to finger scale cun, then remove miniature precision support frame to needle valve spring mounting journal, turn needle valve spring holder coupling journal diameter, needle valve in proper order neck diameter to finger scale cun.
2. The green precision turning method for the large-length-diameter-ratio needle valve coupling journal as claimed in claim 1, characterized in that in the second step, a 45-degree external turning tool is adopted during turning, and a PCBN blade is adopted as a blade.
3. The green precision turning method for the large-length-diameter-ratio needle valve coupling journal as claimed in claim 2, wherein the blade angles are respectively: the front angle is-6 degrees, the blade inclination angle is-6 degrees, and the main deflection angle is 45 degrees.
4. The green precision turning method for the large-length-diameter-ratio needle valve coupling journal as claimed in claim 3, wherein the arc radius of the nose is r epsilon 0.8 mm.
5. The green precision turning method for the large-length-diameter-ratio needle valve coupling journal as claimed in claim 4, characterized in that hard turning is adopted in the turning process.
6. The green precision turning method for the large-length-diameter-ratio needle valve coupling journal as claimed in claim 5, characterized in that the cutting speed of a main shaft for mounting the turning tool is 200m/min, the feed rate is 0.02-0.05mm/r, and the cutting depth is 0.05 mm.
7. The green precision turning method for the large-length-to-diameter-ratio needle valve coupling journal as claimed in claim 6, characterized in that the surface roughness of the machined part is not more than Ra0.4, and the journal bounce is not more than 0.03 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910976306.3A CN110695376A (en) | 2019-10-15 | 2019-10-15 | Green precision turning method for large length-diameter ratio needle valve coupling shaft neck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910976306.3A CN110695376A (en) | 2019-10-15 | 2019-10-15 | Green precision turning method for large length-diameter ratio needle valve coupling shaft neck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110695376A true CN110695376A (en) | 2020-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910976306.3A Pending CN110695376A (en) | 2019-10-15 | 2019-10-15 | Green precision turning method for large length-diameter ratio needle valve coupling shaft neck |
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| CN (1) | CN110695376A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10134176A1 (en) * | 2000-07-14 | 2002-01-24 | Alu Menziken Ind Ag Menziken | High precision processing of external surface of thin-walled pipe involves clamping pipe at one end, moving external processing tool axially along pipe from other end with relative rotation |
| JP2002126824A (en) * | 2000-10-23 | 2002-05-08 | Ricoh Co Ltd | Method for processing thin thickness core bar and method for processing fixing roller core bar for electrophotography |
| CN101966596A (en) * | 2010-08-13 | 2011-02-09 | 北京航空航天大学 | High-length-to-diameter ratio variable-section slender shaft ultrasonic elliptical vibration turning machining method |
| CN102259194A (en) * | 2011-07-14 | 2011-11-30 | 青岛元鼎高合金管业有限公司 | Processing method of slender axle |
| CN107182230B (en) * | 2011-12-20 | 2014-08-13 | 哈尔滨东安发动机（集团）有限公司 | The processing method of hollow thin-wall slender axles |
| CN106583756A (en) * | 2015-10-14 | 2017-04-26 | 王爱民 | Journal turning process replacing grinding and journal |
| CN106735319A (en) * | 2016-11-25 | 2017-05-31 | 中国科学院上海技术物理研究所 | A kind of method of precision turning regenerator elongate plunger rod |
| CN107855812A (en) * | 2017-11-08 | 2018-03-30 | 信利光电股份有限公司 | A kind of processing tool and processing method of thin and long shafts part turning |
-
2019
- 2019-10-15 CN CN201910976306.3A patent/CN110695376A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10134176A1 (en) * | 2000-07-14 | 2002-01-24 | Alu Menziken Ind Ag Menziken | High precision processing of external surface of thin-walled pipe involves clamping pipe at one end, moving external processing tool axially along pipe from other end with relative rotation |
| JP2002126824A (en) * | 2000-10-23 | 2002-05-08 | Ricoh Co Ltd | Method for processing thin thickness core bar and method for processing fixing roller core bar for electrophotography |
| CN101966596A (en) * | 2010-08-13 | 2011-02-09 | 北京航空航天大学 | High-length-to-diameter ratio variable-section slender shaft ultrasonic elliptical vibration turning machining method |
| CN102259194A (en) * | 2011-07-14 | 2011-11-30 | 青岛元鼎高合金管业有限公司 | Processing method of slender axle |
| CN107182230B (en) * | 2011-12-20 | 2014-08-13 | 哈尔滨东安发动机（集团）有限公司 | The processing method of hollow thin-wall slender axles |
| CN106583756A (en) * | 2015-10-14 | 2017-04-26 | 王爱民 | Journal turning process replacing grinding and journal |
| CN106735319A (en) * | 2016-11-25 | 2017-05-31 | 中国科学院上海技术物理研究所 | A kind of method of precision turning regenerator elongate plunger rod |
| CN107855812A (en) * | 2017-11-08 | 2018-03-30 | 信利光电股份有限公司 | A kind of processing tool and processing method of thin and long shafts part turning |
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Application publication date: 20200117 |