CN102350658A - Ultra-precise processing method for circular conical surface of fluid static pressure sealing ring for nuclear primary pump - Google Patents
Ultra-precise processing method for circular conical surface of fluid static pressure sealing ring for nuclear primary pump Download PDFInfo
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- CN102350658A CN102350658A CN2011102999187A CN201110299918A CN102350658A CN 102350658 A CN102350658 A CN 102350658A CN 2011102999187 A CN2011102999187 A CN 2011102999187A CN 201110299918 A CN201110299918 A CN 201110299918A CN 102350658 A CN102350658 A CN 102350658A
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Abstract
一种核主泵用流体静压密封环圆锥面超精密加工方法，属于精密加工技术领域。其特征是将密封环夹持在回转工作台中心，杯形砂轮半径为75～250毫米，杯形砂轮端面与杯形砂轮回转轴线的交点到回转工作台回转轴线的距离为100～350毫米，根据磨削生成表面的锥度误差小于给定锥度公差的原则选择杯形砂轮回转轴线相对于回转工作台回转轴线的倾角以及杯形砂轮回转轴线与过杯形砂轮端面与杯形砂轮回转轴线的交点且垂直相交于回转工作台回转轴线的直线的夹角。磨削时回转工作台和杯形砂轮做回转运动，杯形砂轮沿回转工作台回转轴线进给，利用杯形砂轮端面进行切入磨削。本发明的效果和益处是机床结构简单，能实现核主泵用流体静压密封环圆锥面高精度、低表面粗糙度磨削。
The invention relates to an ultra-precision machining method for a conical surface of a fluid static pressure sealing ring for a nuclear main pump, belonging to the technical field of precision machining. It is characterized in that the sealing ring is clamped at the center of the rotary table, the radius of the cup-shaped grinding wheel is 75-250 mm, and the distance from the intersection point of the end surface of the cup-shaped grinding wheel and the axis of rotation of the cup-shaped grinding wheel to the axis of rotation of the rotary table is 100-350 mm. According to the principle that the taper error of the surface generated by grinding is less than the given taper tolerance, the inclination angle of the cup-shaped grinding wheel axis of rotation relative to the rotary table's axis of rotation and the intersection point of the cup-shaped grinding wheel's axis of rotation and the end surface of the cup-shaped grinding wheel and the axis of rotation of the cup-shaped grinding wheel are selected. And the angle between the straight line perpendicular to the rotary axis of the rotary table. During grinding, the rotary table and the cup-shaped grinding wheel make a rotary motion, and the cup-shaped grinding wheel is fed along the rotary axis of the rotary table, and the end face of the cup-shaped grinding wheel is used for in-cut grinding. The effect and benefit of the invention is that the machine tool has a simple structure and can realize high-precision and low-surface-roughness grinding of the conical surface of the fluid static pressure sealing ring for the nuclear main pump.
Description
Technical field
The invention belongs to the nuclear main pump with hydrostatic pressure sealing ring taper seat Ultraprecision Machining field, relate to the processing of mechanical seal ring, particularly the nuclear main pump is with hydrostatic pressure sealing ring taper seat superfine grinding method.
Background technology
The many employings of axle Feng Shihe main pump can be born high pressure and prevented to have radioactive cooling agent leakage with heavy duty, long-life hydrostatic pressure mechanical seal.Its sealing principle is at the appear taper seat of inclination angle minimum (0.00017～0.0007 radian) of rotating ring or stationary ring end face processing; So that between the seal interface of forming by rotating ring and stationary ring, produce wedge shape convergence gap; The hydrostatic pressure that is produced by the hydrostatic pressure effect makes opening force and the mutual balance of closing force; Between the seal interface, form stable, have certain hydrostatic pressure rigidity, thickness is the fluid film of 10～20 μ m, the end face of two sealing rings is separated and direct contact is not taken place.The nuclear main pump can reach 300 millimeters with the external diameter of hydrostatic pressure sealing ring; Process by hard brittle material such as aluminium oxide, carborundum, silicon nitride etc.; Surface figure accuracy requires in 1～2 helium light belt (1 helium light belt is grown 0.29 micron), and surface roughness Ra is less than 5 nanometers, and its ultraprecise processing is extremely difficult.
When on plain external grinding machine or universal grinding machine external, passing through abrasive wheel end face grinding nuclear main pump with hydrostatic pressure sealing ring taper seat; Emery wheel is that face contacts with sealing ring; Grinding force is big, and the abrasive wheel end face uneven wear is serious, can't process close tolerance seal ring taper seat.When adopting horizontal axis rotary grinder processing sealing ring taper seat; The working portion of emery wheel is an outer circumference surface; The emery wheel axial width is generally less than the sealing ring width; Except the gyration of the gyration that needs round platform and emery wheel; Also need be along the radial and axial feed motion of round platform; Because the round platform rotating speed is lower; Emery wheel needs considerable revolution to travel through the sealing ring surface to be machined fully once; The irregular wear of emery wheel working surface and uniform wear radially all can influence the surface figure accuracy that grinding generates the surface, so the horizontal axis rotary grinder is not suitable for processing nuclear main pump hydrostatic pressure sealing ring taper seat.Emery wheel contacts for point with sealing ring when adopting multi-axis linkage numerical control grinding sealing ring taper seat; There is certain residual height between the motion path of emery wheel cutting point; Abrasion of grinding wheel is fast; The grinding wheel shape retentivity is poor; Prior art still can not be fine an accurate correction of the flank shape of solution emery wheel and an abrasion of grinding wheel compensation difficult problem, machining accuracy is difficult for assurance.Flat sealing anchor ring adopts usually and grinds and polishing is processed, but grinds or during polishing sealing ring taper seat, be easy to generate collapse limit and convexity defective.
Summary of the invention
In order to overcome the deficiency of above-mentioned prior art; The object of the present invention is to provide a kind of ultraprecise processing method that is directed against the nuclear main pump with hydrostatic pressure sealing ring taper seat, this method can realize examining main pump with hydrostatic pressure sealing ring taper seat high accuracy, low surface roughness grinding.
Technical scheme of the present invention is that the end face that adopts rotary table to drive sealing ring revolution and employing cup emery wheel is done crush grinding.Cup emery wheel is installed on the ultraprecise main shaft; This cup emery wheel is done the high-precision rotary motion around its axis of rotation; To examine main pump and be installed on the ultra-precise revolving workbench with the hydrodynamic seal ring, rotary table is clamped in the center of rotary table to sealing ring and can drives sealing ring does the high-precision rotary motion around the axis of rotation of rotary table.The end face of cup emery wheel is relative with rotary table, and cup emery wheel is done feed motion at the axis of rotation that Precision Linear Moving mechanism drives the lower edge rotary table.
The cup emery wheel radius is 75～250 millimeters, and the face width of cup emery wheel end face is 2～5 millimeters.The axis of rotation intersection point of the end face of cup emery wheel and cup emery wheel is 100～350 millimeters to the distance of the axis of rotation of rotary table.Cup emery wheel axis of rotation and the intersection point of crossing cup emery wheel end face and cup emery wheel axis of rotation and the angle that is vertically intersected on the straight line of rotary table axis of rotation are 1.57～1.5708 radians, and the axis of rotation of cup emery wheel is 0～0.0008 radian with respect to the inclination angle of the axis of rotation of rotary table.The end face of given cup emery wheel radius and cup emery wheel and the axis of rotation intersection point of cup emery wheel are after the distance of the axis of rotation of rotary table, and the taper error that generates the surface according to grinding confirms that less than the principle of given tapering tolerance the cup emery wheel axis of rotation is with respect to the angle of inclination of rotary table axis of rotation and cup emery wheel axis of rotation and the intersection point of crossing cup emery wheel end face and cup emery wheel axis of rotation and be vertically intersected on the angle of the straight line of rotary table axis of rotation.
When main pump is examined in grinding with hydrostatic pressure sealing ring taper seat; Cup emery wheel is around the axis of rotation revolution of cup emery wheel; The cup emery wheel rotating speed is 1000～10000 rev/mins; Rotary table is around the axis of rotation revolution of rotary table; The rotary table rotating speed is 50～500 rev/mins; Cup emery wheel is along the axis of rotation feeding of rotary table; Feed speed is 0～5 micron/minute; End face incision sealing ring surface to be machined through cup emery wheel is done the feed motion grinding or is done the sparking out of no feed motion.
Because adopt the end face of cup emery wheel to carry out crush grinding, cup emery wheel is that line contacts with sealing ring, the contact length of emery wheel and sealing ring, contact area, entrance angle immobilize during grinding, so the grinding force maintenance is constant, and machining state is stable.Suitably the axis of rotation of inching cup emery wheel can compensate because lathe is out of shape with respect to the inclination angle of the axis of rotation of rotary table or cup emery wheel axis of rotation and the intersection point of crossing cup emery wheel end face and cup emery wheel axis of rotation and the angle that is vertically intersected on the straight line of rotary table axis of rotation and cause additional face shape error.
Owing to adopt the end face of cup emery wheel to carry out crush grinding, the geometry of cup emery wheel end face is not because of the wearing and tearing of cup emery wheel change during grinding, so the wearing and tearing of cup emery wheel are to the not influence of surface figure accuracy on grinding surface.
Because the cutting depth of cup emery wheel is the ratio of cup emery wheel feed speed and rotary table rotating speed; When the cup emery wheel feed speed be 0～5 micron/minute, when the rotary table rotating speed is 50～500 rev/mins; Therefore the cutting depth of cup emery wheel can realize little cutting-in grinding less than 0.1 micron.
Effect of the present invention and benefit are to compare with hydrostatic pressure sealing ring conical surface construction method with existing nuclear main pump, not only have surface figure accuracy height, advantage that surface roughness is low, and machine tool structure are simple, the working (machining) efficiency height, and cost is low.
Description of drawings
Accompanying drawing is a process principle sketch map of the present invention.
Among the figure: 1 rotary table; 2 cup emery wheels; 3 sealing rings.
The specific embodiment
Be described in detail the specific embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.
Technical scheme of the present invention is to adopt sealing ring revolution, cup emery wheel end face crush grinding mode; Cup emery wheel as shown in the figure is installed on the ultraprecise air bearing electricity main shaft; The used abrasive particle of cup emery wheel is a diamond; The radius of cup emery wheel is 50～250 millimeters, and the face width of cup emery wheel end face is 2～5 millimeters.The axial runout of ultraprecise air bearing electricity main shaft and circular runout are less than 0.05 micron, and ultraprecise air bearing electricity main shaft can drive cup emery wheel and do the high-precision rotary motion around the axis of rotation of ultraprecise air bearing electricity main shaft.Sealing ring is clamped in the center by the ultra-precise revolving workbench of air bearings support, and rotary table can drive sealing ring and do the high-precision rotary motion around the axis of rotation of rotary table, and the axial runout of rotary table and circular runout are less than 0.05 micron.The end face of cup emery wheel is relative with rotary table, and cup emery wheel can be done feed motion along the axis of rotation direction of rotary table under Precision Linear Moving mechanism drives.The axis of rotation intersection point of the end face of cup emery wheel and cup emery wheel is 100～350 millimeters to the distance of the axis of rotation of rotary table.Cup emery wheel axis of rotation and the intersection point of crossing cup emery wheel end face and cup emery wheel axis of rotation and the angle that is vertically intersected on the straight line of rotary table axis of rotation are 1.57～1.5708 radians, and the cup emery wheel axis of rotation is 0～0.0008 radian with respect to the inclination angle of rotary table axis of rotation.The taper error that generates the surface according to grinding selects the cup emery wheel axis of rotation with respect to the inclination angle of rotary table axis of rotation and cup emery wheel axis of rotation and the intersection point of crossing cup emery wheel end face and cup emery wheel axis of rotation and be vertically intersected on the angle of the straight line of rotary table axis of rotation less than the principle of given tapering tolerance.
Grinding nuclear main pump is during with the taper seat of hydrostatic pressure sealing ring; Cup emery wheel is around the axis of rotation revolution of cup emery wheel; The rotating speed of cup emery wheel is 1000～10000 rev/mins, and rotary table is around the axis of rotation revolution of rotary table, and the rotating speed of rotary table is 50～500 rev/mins.Cup emery wheel is along the axis of rotation direction feeding of rotary table, and the feed speed of cup emery wheel is 0～5 micron/minute, and the end face incision sealing ring surface to be machined through cup emery wheel has the feed motion grinding or do not have the sparking out of feed motion.
For improving working (machining) efficiency; Cut down finished cost; Grinding nuclear main pump is during with the taper seat of hydrostatic pressure sealing ring; Can be divided into and roughly grind and finish grind two stages; In the corase grind stage; Adopt the coarseness cup emery wheel to remove most allowance fast,, adopt #2000 or more fine-grained cup emery wheel to carry out superfine grinding in the correct grinding stage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110299918 CN102350658B (en) | 2011-09-28 | 2011-09-28 | Ultra-precise processing method for circular conical surface of fluid static pressure sealing ring for nuclear primary pump |
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| CN 201110299918 CN102350658B (en) | 2011-09-28 | 2011-09-28 | Ultra-precise processing method for circular conical surface of fluid static pressure sealing ring for nuclear primary pump |
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| CN102350658A true CN102350658A (en) | 2012-02-15 |
| CN102350658B CN102350658B (en) | 2013-08-07 |
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| CN 201110299918 Expired - Fee Related CN102350658B (en) | 2011-09-28 | 2011-09-28 | Ultra-precise processing method for circular conical surface of fluid static pressure sealing ring for nuclear primary pump |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102528613A (en) * | 2012-02-29 | 2012-07-04 | 大连理工大学 | Machining method for complex surface of fluid dynamic pressure and static pressure combined mechanical seal ring for nuclear main pump |
| CN102601691A (en) * | 2012-04-06 | 2012-07-25 | 大连理工大学 | Conical surface grinding method |
| CN102806507A (en) * | 2012-07-20 | 2012-12-05 | 大连理工大学 | Method for grinding sealing ring |
| CN102806508A (en) * | 2012-07-20 | 2012-12-05 | 大连理工大学 | Complex molded surface grinding method for three-axis linkage mechanical sealing ring |
| CN103406771A (en) * | 2013-07-22 | 2013-11-27 | 芜湖陀曼精机科技有限公司 | Static-pressure sealing structure of lower surface of vertical high-precision working table |
| CN103790855A (en) * | 2014-02-21 | 2014-05-14 | 清华大学 | Nuclear main pump mechanical seal system with active and passive shutdown sealing |
| CN105014489A (en) * | 2015-07-03 | 2015-11-04 | 霍凤伟 | Processing method of sealing ring and sealing ring processed by processing method |
| CN106670909A (en) * | 2016-12-30 | 2017-05-17 | 西华大学 | Heat cover type grinding device for machining sealing ring with regularly conical surface |
| CN106826476A (en) * | 2017-03-20 | 2017-06-13 | 西华大学 | The set pressure type grinding attachment of inverted cone surface sealing ring |
| CN110788753A (en) * | 2018-07-24 | 2020-02-14 | 株式会社迪思科 | creep feed grinding method |
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| JPS61152356A (en) * | 1984-12-26 | 1986-07-11 | Toyoda Mach Works Ltd | Grinding method for cylindrical or conical surface |
| JP2001212729A (en) * | 2000-02-01 | 2001-08-07 | Koyo Mach Ind Co Ltd | Grinding method and grinding device for rod-shaped workpiece |
| CN101462245A (en) * | 2009-01-04 | 2009-06-24 | 瓦房店轴承集团有限责任公司 | Method for grinding conical bearing large cone angle roller for wind power generation |
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2011
- 2011-09-28 CN CN 201110299918 patent/CN102350658B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4489520A (en) * | 1981-07-30 | 1984-12-25 | Robert R. Griese | Machine tool attachment |
| JPS61152356A (en) * | 1984-12-26 | 1986-07-11 | Toyoda Mach Works Ltd | Grinding method for cylindrical or conical surface |
| JP2001212729A (en) * | 2000-02-01 | 2001-08-07 | Koyo Mach Ind Co Ltd | Grinding method and grinding device for rod-shaped workpiece |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102528613A (en) * | 2012-02-29 | 2012-07-04 | 大连理工大学 | Machining method for complex surface of fluid dynamic pressure and static pressure combined mechanical seal ring for nuclear main pump |
| CN102601691A (en) * | 2012-04-06 | 2012-07-25 | 大连理工大学 | Conical surface grinding method |
| CN102806507B (en) * | 2012-07-20 | 2014-08-27 | 大连理工大学 | Method for grinding sealing ring |
| CN102806508A (en) * | 2012-07-20 | 2012-12-05 | 大连理工大学 | Complex molded surface grinding method for three-axis linkage mechanical sealing ring |
| CN102806507A (en) * | 2012-07-20 | 2012-12-05 | 大连理工大学 | Method for grinding sealing ring |
| CN102806508B (en) * | 2012-07-20 | 2014-10-15 | 大连理工大学 | Complex molded surface grinding method for three-axis linkage mechanical sealing ring |
| CN103406771A (en) * | 2013-07-22 | 2013-11-27 | 芜湖陀曼精机科技有限公司 | Static-pressure sealing structure of lower surface of vertical high-precision working table |
| CN103406771B (en) * | 2013-07-22 | 2015-05-27 | 芜湖陀曼精机科技有限公司 | Static-pressure sealing structure of lower surface of vertical high-precision working table |
| CN103790855A (en) * | 2014-02-21 | 2014-05-14 | 清华大学 | Nuclear main pump mechanical seal system with active and passive shutdown sealing |
| CN105014489A (en) * | 2015-07-03 | 2015-11-04 | 霍凤伟 | Processing method of sealing ring and sealing ring processed by processing method |
| CN106670909A (en) * | 2016-12-30 | 2017-05-17 | 西华大学 | Heat cover type grinding device for machining sealing ring with regularly conical surface |
| CN106826476A (en) * | 2017-03-20 | 2017-06-13 | 西华大学 | The set pressure type grinding attachment of inverted cone surface sealing ring |
| CN110788753A (en) * | 2018-07-24 | 2020-02-14 | 株式会社迪思科 | creep feed grinding method |
| CN110788753B (en) * | 2018-07-24 | 2023-03-14 | 株式会社迪思科 | Slow feed grinding method |
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