CN102350658B - 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 PDF

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Publication number
CN102350658B
CN102350658B CN 201110299918 CN201110299918A CN102350658B CN 102350658 B CN102350658 B CN 102350658B CN 201110299918 CN201110299918 CN 201110299918 CN 201110299918 A CN201110299918 A CN 201110299918A CN 102350658 B CN102350658 B CN 102350658B
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China
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emery wheel
axis
rotation
cup emery
rotary
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CN 201110299918
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Chinese (zh)
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CN102350658A (en
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霍凤伟
郭东明
康仁科
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大连理工大学
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Abstract

The invention relates to an ultra-precise processing method for the circular conical surface of a fluid static pressure sealing ring for a nuclear primary pump, which belongs to the technical field of precise processing and is characterized in that the sealing ring is clamped in the center of a rotating work table, the radius of a cup-shaped grinding wheel is 75 to 250mm, the distance from the crossing point of the end surface of the cup-shaped grinding wheel and a rotating axis of the cup-shaped grinding wheel to a rotating axis of the rotating work table is 100 to 350mm, according to the principle that the taper error of the surface generated by the grinding is smaller than the given taper tolerance, an inclination angle of the rotating axis of the cup-shaped grinding wheel relative to the rotating axis of the rotating work table and an included angle between the rotating axis of the cup-shaped grinding wheel and a straight line are selected, wherein the straight line passes through the crossing point of the end surface of the cup-shaped grinding wheel and the rotating axis of the cup-shaped grinding wheel and is vertically intersected with the rotating axis of the rotating work table. During grinding, the rotating work table and the cup-shaped grinding wheel do rotating movement, the cup-shaped grinding wheel feeds along the rotating axis of the rotating work table, and the cutting-in grinding is carried out by the end surface of the cup-shaped grinding wheel. The ultra-precise processing method has the effects and benefits that the machine tool structure is simple, and the high-precise and low-surface-roughness grinding of the circular conical surface of the fluid static pressure sealing ring for the nuclear primary pump can be realized.

Description

Nuclear main pump hydrostatic pressure sealing ring taper seat ultraprecise processing method

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 nuclear main pump hydrostatic pressure sealing ring taper seat superfine grinding method.

Background technology

The many employings of axle Feng Shihe main pump can bear high pressure and heavy duty, long-life hydrostatic pressure mechanical seal prevent from having radioactive cooling agent leakage.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, in order between the seal interface of being formed 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, made 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.

At plain external grinding machine or universal grinding machine external by abrasive wheel end face grinding nuclear main pump during 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 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 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 the accurate correction of the flank shape of solution emery wheel and an abrasion of grinding wheel compensation difficult problem, machining accuracy is difficult for guaranteeing.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 above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of ultraprecise processing method at nuclear main pump usefulness hydrostatic pressure sealing ring taper seat, this method can realize examining main pump 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 is determined the cup emery wheel axis of rotation 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 is vertically intersected on the angle of the straight line of rotary table axis of rotation less than the principle of given tapering tolerance.

When grinding nuclear main pump is used 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 by 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 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 process principle schematic diagram 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 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 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 is selected 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 is vertically intersected on the angle of the straight line of rotary table axis of rotation less than the principle of given tapering tolerance.

When grinding nuclear main pump is used 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 by 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, when grinding nuclear main pump is used 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, in the correct grinding stage, adopt #2000 or more fine-grained cup emery wheel to carry out superfine grinding.

Claims (1)

1. a nuclear main pump is with hydrostatic pressure sealing ring taper seat ultraprecise processing method, the end face that adopts rotary table to drive sealing ring revolution and employing cup emery wheel is done crush grinding, wherein this cup emery wheel is around the axis of rotation revolution of cup emery wheel, rotary table is clamped in the center of rotary table with sealing ring and can drives sealing ring around the axis of rotation revolution of rotary table, the end face of cup emery wheel is relative with rotary table, cup emery wheel moves along the axis of rotation of rotary table, it is characterized in that:
(1) 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, wherein do not comprise 0 radian, 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;
(2) intersection point of given cup emery wheel radius and cup emery wheel end face and cup emery wheel axis of rotation is after the distance of rotary table axis of rotation, and the taper error that generates the surface according to grinding is determined 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 is vertically intersected on the angle of the straight line of rotary table axis of rotation less than the principle of given tapering tolerance;
When (3) grinding nuclear main pump is with hydrostatic pressure sealing ring taper seat, cup emery wheel is around the axis of rotation revolution of cup emery wheel, rotary table is around the axis of rotation revolution of rotary table, cup emery wheel is along the axis of rotation feeding of rotary table, end face incision sealing ring surface to be machined by cup emery wheel is done the feed motion grinding or is done the sparking out of no feed motion.
CN 201110299918 2011-09-28 2011-09-28 Ultra-precise processing method for circular conical surface of fluid static pressure sealing ring for nuclear primary pump CN102350658B (en)

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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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Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102528613B (en) * 2012-02-29 2013-10-16 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
CN102601691B (en) * 2012-04-06 2013-12-25 大连理工大学 Conical surface grinding method
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
CN102806507B (en) * 2012-07-20 2014-08-27 大连理工大学 Method for grinding sealing ring
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
CN105014489B (en) * 2015-07-03 2020-07-17 霍凤伟 Sealing ring processing method and sealing ring processed by same
CN106670909B (en) * 2016-12-30 2019-03-22 西华大学 Process the thermal sleeve grinding attachment of positive conical surface sealing ring
CN106826476B (en) * 2017-03-20 2019-02-01 西华大学 The set pressure type grinding attachment of inverted cone surface sealing ring

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US4489520A (en) * 1981-07-30 1984-12-25 Robert R. Griese Machine tool attachment
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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JP3831170B2 (en) * 2000-02-01 2006-10-11 光洋機械工業株式会社 Bar-shaped workpiece grinding equipment

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