CN109014778B - Numerical control machining method for sealing ring groove of non-rotating part - Google Patents
Numerical control machining method for sealing ring groove of non-rotating part Download PDFInfo
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- CN109014778B CN109014778B CN201810831054.0A CN201810831054A CN109014778B CN 109014778 B CN109014778 B CN 109014778B CN 201810831054 A CN201810831054 A CN 201810831054A CN 109014778 B CN109014778 B CN 109014778B
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- ring groove
- cutter
- numerical control
- rotating part
- sealing ring
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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 belongs to the field of machining of precision parts with special structures, and relates to a numerical control machining method for a sealing ring groove of a non-rotating part. In the invention, in milling the ring groove, the cutter configuration of a narrow cutter and a wide cutter is adopted, the allowance is removed by the narrow cutter, and then the wide cutter is adopted for precision machining, so that the surface machining precision is improved. In the aspect of processing strategy, a method of cutting the side surface is adopted, and the surface luminosity requirement of the side surface of the ring groove is ensured. In order to further improve the surface sealing performance and avoid the influence of the lines at the cutting position of the ring groove cutter on the sealing performance, after the ring groove cutter is machined, the inner cylindrical surface of the ring groove is polished by adopting a secondary polishing method. By applying the method, the processing precision of the sealing ring groove is improved, the coaxiality requirement of the ring groove and the bottom hole is realized, and the sealing performance of the product is improved by changing the processing lines. An effective processing method is created for processing the sealing ring groove of the non-rotary part.
Description
Technical Field
The invention belongs to the field of machining of precision parts with special structures, and relates to a numerical control machining method for a sealing ring groove of a non-rotating part.
Background
A shell body and a cylinder body of a certain hydraulic steering engine are designed in an integrated structure, a plurality of sealing ring grooves are designed in a piston mounting hole and used for sealing oil passages in the hole to prevent hydraulic oil from leaking, and therefore the sealing ring grooves are required to have high precision requirements, and meanwhile the surface luminosity of the side faces and the inner cylindrical surface in the ring grooves is required to meet high design requirements. Therefore, the design of related products requires that the coaxiality between the inside of the ring groove and the bottom hole is 0.04mm, the bottom surface brightness of the ring groove is Ra0.8, the side wall surface brightness is Ra1.6, and simultaneously machining lines parallel to the axis of the hole cannot appear.
Such a seal ring groove is rare in the case, and has been frequently found in rotary parts in the past. The turning processing is adopted for the rotary parts, so that the technical indexes such as processing precision, surface grains and the like are easily ensured. However, with the application of the MBD technology, the design of the housing is more and more complex, and if turning is adopted, the precision cannot be guaranteed due to unbalanced rotation of the part in the machining process. The casing processing mainly adopts numerical control milling process, and the annular sword processing seal ring groove in-process, difficult surface luminosity of guaranteeing annular side and bottom surface, simultaneously because numerical control milling process face of cylinder process is that the interpolation algorithm of main shaft forms circular processing orbit, must lead to the fact the surface line to be on a parallel with hole axial direction, influence inside oil circuit sealing performance. Therefore, in the process of milling the sealing ring groove number, a special cutter needs to be customized, and a scientific milling strategy needs to be formulated. How to realize the machining precision of each design element and change the surface machining lines is not reported at home and abroad in the current related machining method, and the machining of the structure is still a difficult problem in the machining industry.
Disclosure of Invention
The purpose of the invention is: in order to solve the problem that the numerical control machining technology is difficult to realize the machining of the hydraulic sealing ring groove structure, and the problems that the internal surface luminosity and the machining lines of the ring groove are difficult to ensure, the invention provides a high-precision machining method for realizing the hydraulic sealing ring groove in the numerical control machining, which realizes the machining precision of the sealing ring groove and improves the sealing performance of the ring groove by effectively controlling the cutting parameters in the ring groove machining process and adopting a surface micro-line precision polishing machining method. Meanwhile, the processing process is stable and reliable, and the requirement of batch production can be met.
The technical scheme of the invention is as follows: a numerical control machining method for a sealing ring groove of a non-rotating part comprises the following steps:
step 1: finely boring a functional hole bottom hole to enable the diameter D1 of the functional hole bottom hole to reach a design size;
step 2: aligning a bottom hole, semi-finishing the ring groove by a narrow ring groove cutter, wherein the cutter width of the narrow ring groove cutter is less than the width L11mm-2mm of the ring groove;
and step 3: finely machining the ring groove to the diameter D2 of the ring groove by a wide ring groove cutter, wherein the cutter width of the wide ring groove cutter is the same as the width L1 of the ring groove;
and 4, step 4: detecting whether the coaxiality of the ring groove and the bottom hole and the three-side luminosity of the ring groove meet design indexes or not;
and 5: the self-made polishing wheel is required to have the thickness L2 the same as the width L1 of the ring groove and ensure that the polishing wheel can be placed in the ring groove, the outer side 2 and the inner side 3 of the polishing wheel are stuck with polishing paper 1 by strong adhesives, the granularity of the polishing paper 1 is not less than 800#, and the side surface and the bottom surface of the ring groove are polished by the self-made polishing wheel;
step 6: observing the processed ring groove by using a 20-time endoscope, and if the inner surface of the ring groove has vertical processing lines parallel to the axis of the bottom hole, repeating the step 5 until the lines disappear;
and 7: and cleaning the part after finishing polishing.
The step 2: when the ring groove is semi-finished, a narrow groove cutter is adopted to process by cutting, and the allowance of each of three surfaces is 0.1 mm.
The step 3: when the ring groove is finely processed, the arc R0.25mm of the tool point of the wide ring groove is required to be round, smooth and smooth.
The step 3: when the ring groove is finely machined, the rotating speed and the feeding parameters of the main shaft in the machining process are correspondingly adjusted according to the size of the ring groove and the size of a cutter.
The step 5: the polishing wheel needs to be kept still for one day after being adhered with polishing paper.
The invention has the beneficial effects that: the invention relates to a method for processing a sealing ring groove of a non-rotating part, which integrally improves the processing precision of the ring groove and solves the problem that the surface mechanical lines generated by numerical control processing have influence on the sealing of a hydraulic oil way. And the surface luminosity problem of one-time processing forming is reduced by a rough machining strategy and a finish machining strategy. Meanwhile, a special polishing tool is adopted to change the mechanical lines on the processing surface and reduce the influence of the lines on the sealing. The method lays a necessary foundation for the precision machining of the sealing ring groove of the non-rotating part.
Drawings
FIG. 1 is a flow chart of a numerical control machining method for a sealing ring groove of a non-rotating part;
FIG. 2 is a front view of a component of a high precision seal ring groove configuration of the present invention;
FIG. 3 is a sectional view A-A of the front view of FIG. 2;
FIG. 4 is an enlarged partial view of the pocket structure of FIG. 3;
wherein: d1-functional hole bottom hole diameter, D2-ring groove diameter, L1-ring groove width
FIG. 5 is a schematic view of a self-made polishing wheel for polishing a ring groove;
wherein: l2-self-made polishing wheel thickness;
fig. 6 is a schematic view of the pasting of the polishing paper.
Wherein: 1-polishing paper, 2-polishing wheel outside, 3-polishing wheel inside
Detailed Description
The invention is further illustrated by the following specific embodiments:
referring to fig. 2, 3 and 4, fig. 2 is a front view of a part of a high precision sealing ring groove structure according to the present invention, fig. 3 is a sectional view a-a of the front view of fig. 2, and fig. 4 is a partially enlarged view of the ring groove structure of fig. 3. In the embodiment, the part is a hydraulic structure part, the part material is 7050 aluminum alloy, the sealing ring groove is non-uniformly designed in the functional bottom hole, the diameter D1 of the functional bottom hole is phi 47.76mm, the diameter D2 of the ring groove is phi 51.99mm, the width L1 of the ring groove is 3mm, the coaxiality of the ring groove relative to the functional bottom hole is required to be phi 0.04mm, the three-side luminosity requirement of the ring groove is Ra0.8, and meanwhile, the surface cutting lines are required to be perpendicular to the axis of the bottom hole.
By analyzing the material properties and the component structure, in the present embodiment, the method for processing the certain annular band end face seal component includes the following steps:
step 1: finely boring a functional hole bottom hole D1 to a design size;
the part adopts a numerical control machining center to complete the integral machining of part holes, drilling and milling bottom holes, roughly boring and finely boring the bottom holes, and ensuring that the diameter D1 of the bottom holes of the functional holes is phi 47.76+ 0 0.05mm, luminosity Ra0.8.
Step 2: aligning a bottom hole, semi-finishing the ring groove by a narrow ring groove cutter, wherein the cutter width of the narrow ring groove cutter is less than the groove width L11mm-2 mm;
and (3) aligning a bottom hole, semi-finishing the annular groove by adopting a narrow annular groove cutter, firstly carrying out radial cutting, cutting to a depth of 0.2mm, then carrying out axial feed, wherein the feed depth is 0.2mm at each time, removing the allowance of the annular groove according to the method, and simultaneously ensuring that the allowance of two side surfaces and the bottom surface of the annular groove is 0.1 mm.
And step 3: finely machining the ring groove to the diameter D2 of the ring groove by a wide ring groove cutter, wherein the cutter width of the wide ring groove cutter is the same as the width L1 of the ring groove;
the ring groove is machined by a self-made wide ring groove cutter with an inverted R at the bottom, the rotating speed of a main shaft is 1000R/min, the feeding is 200mm/R, and the diameter D2 of the ring groove is ensured. The arc of the tool nose is R0.25mm, and the bottom of the circular groove is reversely R-shaped in one step.
And 4, step 4: detecting whether the coaxiality of the ring groove and the bottom hole and the three-side luminosity of the ring groove meet design indexes or not;
and measuring the surface luminosity of the side surface and the bottom surface of the ring groove and the coaxiality of the bottom hole and the ring groove. And (5) continuing to perform the step 5 when the luminosity and the coaxiality meet the design requirements, otherwise, debugging the part again until the luminosity and the coaxiality meet the design requirements.
And 5: the self-made polishing wheel is required to have the thickness L2 the same as the width L1 of the ring groove and ensure that the polishing wheel can be placed in the ring groove, the outer side 2 and the inner side 3 of the polishing wheel are stuck with polishing paper 1 by strong adhesives, the granularity of the polishing paper 1 is not less than 800#, and the self-made polishing wheel is used for polishing the side surface and the bottom surface of the ring groove;
three sides of the polishing ring groove are self-manufactured, the polishing wheel is used as a cutter to be installed on a machine tool according to a numerical control machining method, and the ring groove is polished in a layered mode.
Step 6: observing the processed ring groove by using a 20-time endoscope, and if the inner surface of the ring groove has vertical processing lines parallel to the axis of the bottom hole, repeating the step 5 until the lines disappear;
and 7: cleaning parts after finishing polishing
And cleaning the part, and removing the surface residue after polishing.
The invention utilizes the reformed annular groove cutter to carry out the forming processing of the sealing annular groove, adopts the wide groove cutter to carry out the one-step forming processing of two side surfaces and the bottom surface of the annular groove, and simultaneously carries out the one-step processing to form the inverted-bottom R. In order to improve the surface luminosity of the ring groove and meet the requirement of design on surface processing lines, the invention adopts a numerical control processing method and a self-made polishing tool. The invention solves the problem of processing the sealing ring groove by a numerical control processing center and meets the requirements of product production and development.
In addition, the structural modifications of the cutting tool and the polishing wheel and the adjustment of the parameters of the part processing process according to actual needs are not beyond the spirit of the present invention and are described in the claims of the present invention, which still belong to the protection scope of the present patent.
Claims (5)
1. A numerical control machining method for a sealing ring groove of a non-rotating part is characterized by comprising the following steps:
step 1: finely boring the functional hole bottom hole to enable the diameter (D1) of the functional hole bottom hole to reach a design size;
step 2: aligning a bottom hole, semi-finishing the ring groove by a narrow ring groove cutter, wherein the cutter width of the narrow ring groove cutter is 1-2 mm smaller than the width (L1) of the ring groove;
and step 3: finely machining the ring groove to the diameter (D2) of the ring groove by using a wide ring groove cutter, wherein the cutter width of the wide ring groove cutter is the same as the width (L1) of the ring groove;
and 4, step 4: detecting whether the coaxiality of the ring groove and the bottom hole and the three-side luminosity of the ring groove meet design indexes or not;
and 5: the self-made polishing wheel is required to have the same thickness (L2) as the width (L1) of the ring groove and can be placed in the ring groove, strong adhesives are adopted to stick polishing paper (1) on the outer side (2) and the inner side (3) of the polishing wheel, the granularity of the polishing paper (1) is not less than 800#, and the self-made polishing wheel is adopted to polish the side surface and the bottom surface of the ring groove;
step 6: observing the processed ring groove by using a 20-time endoscope, and if the inner surface of the ring groove has vertical processing lines parallel to the axis of the bottom hole, repeating the step 5 until the lines disappear;
and 7: and cleaning the part after finishing polishing.
2. The numerical control machining method for the sealing ring groove of the non-rotating part as claimed in claim 1, wherein the step 2: when the ring groove is semi-finished, a narrow ring groove cutter is adopted to process by cutting, and the allowance of each of three surfaces is 0.1 mm.
3. The numerical control machining method for the sealing ring groove of the non-rotating part as claimed in claim 1, wherein the step 3: when the ring groove is finely processed, the arc R0.25mm of the tool point of the wide ring groove is required to be round, smooth and smooth.
4. The numerical control machining method for the sealing ring groove of the non-rotating part as claimed in claim 3, wherein the step 3: when the ring groove is finely machined, the rotating speed and the feeding parameters of the main shaft in the machining process are correspondingly adjusted according to the size of the ring groove and the size of the cutter.
5. The numerical control machining method for the sealing ring groove of the non-rotating part as claimed in claim 1, wherein the step 5: the polishing wheel needs to be kept still for one day after being adhered with polishing paper.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810831054.0A CN109014778B (en) | 2018-07-25 | 2018-07-25 | Numerical control machining method for sealing ring groove of non-rotating part |
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| CN201810831054.0A CN109014778B (en) | 2018-07-25 | 2018-07-25 | Numerical control machining method for sealing ring groove of non-rotating part |
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| CN109014778A CN109014778A (en) | 2018-12-18 |
| CN109014778B true CN109014778B (en) | 2020-06-09 |
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| CN114406293A (en) * | 2022-02-18 | 2022-04-29 | 重庆江增船舶重工有限公司 | Processing method and inspection device for multistage ring groove |
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| CN101967646A (en) * | 2009-07-27 | 2011-02-09 | 中国北车集团大同电力机车有限责任公司 | Method for improving wear resistance of ring slots of combined piston steel top of diesel engine |
| CN102468721A (en) * | 2010-11-18 | 2012-05-23 | 上海重型机器厂有限公司 | Method for processing center blind hole of million-kilowatt generator rotor |
| CN106507727B (en) * | 2010-08-27 | 2014-04-23 | 中国航空工业第六一八研究所 | A kind of laser gyro coquille annular groove grinding and polishing device and its abrasive polishing method |
| CN105945509A (en) * | 2016-05-26 | 2016-09-21 | 长治清华机械厂 | Half-blind hole and blind hole hydraulic cylinder inner wall ultrasonic finishing method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166382B (en) * | 2011-12-14 | 2015-10-28 | 上海重型机器厂有限公司 | The processing method of the circular transition section on bottom of central blind hole of generator amature |
| CN103659159B (en) * | 2012-09-07 | 2016-01-13 | 中国航空工业第六一八研究所 | A kind of hydraulic case height precision profound valve installing hole processing method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101967646A (en) * | 2009-07-27 | 2011-02-09 | 中国北车集团大同电力机车有限责任公司 | Method for improving wear resistance of ring slots of combined piston steel top of diesel engine |
| CN106507727B (en) * | 2010-08-27 | 2014-04-23 | 中国航空工业第六一八研究所 | A kind of laser gyro coquille annular groove grinding and polishing device and its abrasive polishing method |
| CN102468721A (en) * | 2010-11-18 | 2012-05-23 | 上海重型机器厂有限公司 | Method for processing center blind hole of million-kilowatt generator rotor |
| CN105945509A (en) * | 2016-05-26 | 2016-09-21 | 长治清华机械厂 | Half-blind hole and blind hole hydraulic cylinder inner wall ultrasonic finishing method |
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