CN1131600A - Method and device for lapping conical surface of metal part - Google Patents
Method and device for lapping conical surface of metal part Download PDFInfo
- Publication number
- CN1131600A CN1131600A CN95119717A CN95119717A CN1131600A CN 1131600 A CN1131600 A CN 1131600A CN 95119717 A CN95119717 A CN 95119717A CN 95119717 A CN95119717 A CN 95119717A CN 1131600 A CN1131600 A CN 1131600A
- Authority
- CN
- China
- Prior art keywords
- conical surface
- grinding stone
- grinding
- tool rack
- axis
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/02—Lapping machines or devices; Accessories designed for working surfaces of revolution
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B33/00—Honing machines or devices; Accessories therefor
- B24B33/02—Honing machines or devices; Accessories therefor designed for working internal surfaces of revolution, e.g. of cylindrical or conical shapes
- B24B33/025—Internal surface of conical shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/11—Lapping tools
- B24B37/20—Lapping pads for working plane surfaces
- B24B37/24—Lapping pads for working plane surfaces characterised by the composition or properties of the pad materials
Abstract
The internal conical surface of a metal piece is ground by putting it in rubbing contact with an abrasive stone surface. The piece is rotated about the conical surface axis and the abrasive stone is given an alternate translatory movement in a direction inclined to the conical surface axis at an angle equal to the half angle at the conical surface top. The abrasive stone is displaced in a direction perpendicular to the conical surface axis so as to adjust the advance and the support pressure of the stone on the internal surface of the piece. A first rough grinding is made with one abrasive stone followed by a second finishing grinding stage by a second stone having a finer granule.
Description
The present invention relates to the method and apparatus of abrasive metal part cone-shaped inner surface.
Particularly, the present invention is applicable to the method and apparatus of the cone-shaped inner surface of the end part of grinding pressurised water nuclear reactor pressure vessel head penetration joints.
Pressurized-water reactor includes and is substantially a columniform container, and the antiseep type is sealed into a hemispheric substantially head in its upper end when reactor is worked.This vessel head is connected by opening, and each opening is equipped with tubular configured joint along the parallel direction of container axis.
This vessel head penetration joints can feed control rod guide in the container along axis direction, and reactor core reaction control rod group or thermocouple pile are installed in the end of guider.
Hot lining and joint cylindrical form interior surface coaxially and be fixed on the joint inside of each path that control rod guide is provided with having little radial clearance.This control rod guide moves in hot lining, and hot lining defines the axially-movable of guider and control rod.
In order to increase the gap between hot lining and the joint inner surface, in the end part of head lower inside, the endoporus of joint path is processed, so that produce the inner surface of a taper.
Joint is welded on the inner surface of vessel head, and when joint was installed in vessel head, they will be heated, and causes distortion and the generation residual stress.
The pressurised water nuclear reactor pressure vessel head penetration joints of being made by nickel alloy has residual-tensile stress through boring, machining with after being fixed on head.
During reactor work, when the tensile stress on the joint inner surface touches the reactor cooling fluid that is in HTHP at inner surface, be disadvantageous for stress corrosion resistant.
Joint can greatly be reduced by carry out certain processing on the joint inner surface and eliminate by the tendency that stress corrosion damaged, and particularly produces the mechanical surface treatment of compression on the inner nosepiece wall superficial layer.
Particularly, on the joint inner surface, carry out milled processed, that is to say the processing that rubs and contact with the grinding stone and the surface of joint.
The roughness that this milled processed can greatly reduce machining and produced produces compression simultaneously on the superficial layer of crossover sub inwall.
Up to now, the column part that grinds the joint endoporus is considered to enough, but its awl end part remains machining.Therefore, during reactor work, this end of joint is vulnerable to the infringement that stress corrosion causes.
Say that more generally the cone-shaped inner surface of abrasive metal part is necessity or desirable to reduce its surface roughness and produce compression on inner surface in some cases.
U.S. Pat-A-2244806 and US-A-2276611 disclose the equipment that grinds conical surface, wherein have the central shaft rotation of the part of conical surface around conical surface, and grinding stone is reciprocating along the generatrix direction of conical surface.The pressure that grinding stone acts on the conical surface is provided by spring.This equipment can not carry out attrition process because attrition process will critically control stock removal and tonnage, thereby after grinding, reach physical dimension accurately and the requirement of surface smoothness.
The purpose of this invention is to provide the method that contacts the conical surface of grinding metal parts by the piece surface and the friction of grinding face, in this method, metal parts is around the axis rotation of conical surface, grinding stone is done reciprocal translational motion along direction that equals the conical surface semiapex angle substantially of relative conical surface axis inclination, and this method makes can very accurately control abrasive parameters to obtain the surface smoothness and the pressure state of metal parts inner surface regulation.
For this reason, grinding stone moves along the direction perpendicular to conical surface axis, so that control stock removal and grinding stone lean against the pressure on the metal parts inner surface.
In order clearly to explain the present invention,, and be described with reference to the accompanying drawing of the internal grinding equipment of nuclear reactor vessel head joint now with non-limiting example.
Fig. 1 is the terminal axial plane cutaway view partly with conical surfaces of nuclear reactor vessel penetration joints.
Fig. 2 is the axial cutaway view of joint shown in Figure 1, and wherein grinding operation is the method according to this invention and carrying out.
Fig. 2 A is the partial sectional view along AA among Fig. 2.
Fig. 3 is the zoomed-in view of the some of Fig. 2, shows to implement the used milling tool details of the inventive method.
Fig. 4 is for implementing the plane and the cutaway view of the used instrument of Ginding process of the present invention.
Fig. 5 is the front and the partial sectional view of the device of the grinding stone axial translation of use grinding tool shown in Figure 4.
Fig. 1 illustrates the end of nuclear reactor vessel head penetration joints 1.
End shown in the joint 1 is its bottom below vessel head, and wherein the wall 2 of joint substantially in a tubular form is processed into and has the cone-shaped inner surface 3 coaxial with the cylindrical upper section of joint.
Open at the joint bottom place of the conical surface 3 below vessel head with the angle, small-bore about 20 °.After being processed into frusto-conical portion, this machining surface method of the present invention, the grinding stone 9 that is carried by tool rack 7 that is shown specifically by device shown in Figure 45 and Fig. 2 grinds.
The tool rack 7 that grinding stone 9 is housed can be along being parallel to the direction bidirectional-movement that axially bored line 4 tilts in the opposing tabs, shown in four-headed arrow 8.
The grinding stone 9 of lapping device is one to have long bar-shapedly and be contained in grinding stone on the grinding stone bearing 6, so that place along the direction that is basically parallel to tool rack 7, tool rack is elongated and can do translational motion along the both direction shown in the four-headed arrow 8.
During grinding, joint 1 is around its axle 4 rotations, shown in the arrow 10 of bending.
Grinding stone 9 is fixed on the inside of the bearing 6 of hollow, and this bearing is by axle 11 and 11 ' flexibly be installed on the tool rack 7, shown in Fig. 2 and 3.
Each axle 11 and 11 ' include a thread head, end 11a as shown in Figure 3.
Axle 11 and 11 ' by as 13 perforate and have the tool rack 7 that radial clearance ground runs through grinder; Axle 11 and 11 ' screw thread partly (end 11a for example shown in Figure 3) be projected into one side opposite with the grinding stone bearing 6 of grinding stone 9 from the surface of tool rack 7.
In this way, grinding stone 6 is installed on the tool rack 7, and can be along doing certain freely-movable with the vertical vertical direction of tool rack 7.
During grinding, tool rack 7 and grinding stone 9 along the conical surface axis 4 with respect to joint 1 become substantially one equal the conical surface 3 semiapex angle the inclination angle direction and arrange.In this way, grinding stone 9 has a grinding face that is basically parallel to joint 1 cone-shaped inner surface 3.
Can see in Fig. 2 A, it is one substantially cylindrical and protrude the outer surface of shape that grinding stone 9 has, and it is adjusted to and makes its inner surface that is parallel to joint substantially 3.
The translation direction of tool rack 7 is corresponding with the direction of feed of the grinding stone that grinds, and it is perpendicular to the bus of cone-shaped inner surface 3, and at a given time, grinding is just carried out along this bus.
As can be seen from Fig. 4, grinding stone 9 is installed in also can be along the vertical direction freely-movable of tool rack 7 longitudinal axis on the tool rack 7, tool rack 7 is fixed on the intermediate support 16, and supporting itself is installed on the mobile slide block 17, and this slide block can move on the slide rail of machine bearing 19.
The cylinder body 18a of power cylinder 18 is fixed on can be on the moving slider 17 that moves on the machine bearing 19.
Piston rod 18b one end of power cylinder 18 connects piston 18c, and the other end is fixed on the fastening lug 20 of hold-down support 19.
In this way, the moving slider 17 that is fixed on the power cylinder cylinder body 18a can be by to the different supply orifices 21 or 21 of the power cylinder ' method of power is provided and move along both direction, and supply orifice lays respectively at the both sides of piston 18c.
As shown in Figure 4, the intermediate support 16 of machine bearing 19, moving slider 17 and support tool frame 7 can move along the both direction (shown in the arrow 22) of the axis 4 that is parallel to joint 1 with perpendicular to the both direction (shown in the arrow 23) of this axis 4, machine bearing 19 is installed on the lathe bedstead 24, the position of bedstead can be controlled along the direction of axis 4, and bedstead includes crank 25, is used for moving along the direction of four-headed arrow 23.
Like this, can be in the direction of axis 4 and the position of control milling tool 5 on perpendicular to the direction of axis, so that make grinding stone 9 have contacting of certain pressure degree, and when grinding, provide the amount of feeding of grinding stone with the inner surface of joint.
Milling apparatus shown in Figure 4 also comprises one stroke terminal stop device 26, it comprises two stroke terminal contactor 26a and 26b, is used for contacting at intermediate support 16, tool rack 7 and the grinding stone 9 exercise end place along the either direction of four-headed arrow 8 with the scotch 27 of intermediate support 16.The trip terminal contactor makes becomes possibility to power cylinder by hole 21 and 21 ' order supplying power.
Therefore can on both direction, grind the cone-shaped inner surface 3 of joint 1.
Because joint 1 is as shown in arrow 10 around its axis 4 rotations, the complete grinding of the inner surface 3 of joint around its axis rotation the time is to finish along the reciprocal translational motion of the generatrix direction of the conical surface 3 by grinding stone 9.
During attrition process, fluid is continuously delivered on the surface of grinding, and fluid is through reclaiming and filtering, so that recycle in milling apparatus.
So milling apparatus includes fluid distribution, recovery and filtration circuit, make recycling continuously of used oil liquid become possibility.
Attrition process divides two stages to carry out, and the phase I is the roughing stage of joint, and second stage is the fine finishining stage.
The roughing stage is that 150 grinding stone carries out with granularity, and the fine finishining stage is that 400 grinding stone carries out with granularity.
Through two process segments, the tapering of joint inner surface 3 has low surface roughness and residual compressive stress, and the stress corrosion resistant of this butt joint inner surface is good.After the grinding, the conical surface of inner surface and the stress and the roughness of cylindrical part are compared measurement.Can prove that method of the present invention can make the tapering of inner surface obtain identical surface roughness and stress state with cylindrical part.
Grinding can make and form one on the cone-shaped inner surface 3 of joint and have the stressor layers that compression, thickness surpass 100 microns approximately.Grind the thickness of conical inboard wall generation that also makes joint and be about 20 microns work hardening layer.
In the example that joint is made by nickel alloy 690, grind and carry out under the following conditions:
The rotating speed of joint: 250 rev/mins
The point-to-point speed of grinding stone: 1200 mm/min
The milling time in roughing stage: 3 times 15 minutes, along identical direction of rotation and grinding stone along direction of feed twice in succession to add the mobile of break be 1 millimeter.
The milling time in fine finishining stage: 1 time 4 minutes, along the direction of rotation identical with the roughing stage, 1 time 1 minute then, along the direction of rotation opposite with the roughing stage.
The pressure of grinding stone on the joint inner surface increases to moving of joint inner surface by tool rack 7, and grinding stone 9 is contained on the tool rack and can moves freely and by spring 14 and 14 ' the press to surface of joint.
By tool rack 7 is moved to the surface 3 of grinding, spring 14 and 14 ' be applied to pressure and the pressure that is applied on the lapped face of grinding stone 9 on the grinding stone 9 increases.
With taper slip gauge check attrition process, the degree of depth that slip gauge is entered into joint inner chamber tapering is measured.
The material thickness of the grinding institute grinding easily degree of depth from the taper hole after the slip gauge insertion grinding is calculated out.
The target that the minimum material stock removal of 0.2 millimeter magnitude on the diameter of bore normally will reach.
The measurement of surface roughness is carried out with profilometer, and the average surface roughness value of expectation is the 0.25Ra in micron.
Thereby method and apparatus according to the invention, make the operation of grinding cone-shaped inner surface can compare with the grinding cylindrical form interior surface fully.
In the example of joint, the operation of grinding the butt conical surface end of joint makes joint form compression on its end inner surface becomes possibility, thereby has limited the sensitivity of this a part of counter stress corrosion of joint.
More generally, the feasible attrition process that can carry out any conical surface of metal parts of method and apparatus according to the invention.
Certainly, method of the present invention can be applicable to the attrition process of the conical outer surface of metal parts.
The invention is not restricted at above-described this method and apparatus.
Can consider to use the attrition process that the equipment that is different from said structure carries out one or more stages.The equipment of implementing the inventive method should be able to make grinding stone along with respect to metal parts around the conical surface axis of its rotation and the direction of a certain angle that tilts is done reciprocal translational motion.
The present invention not only is applied to grind the inner surface of joint, and can be applied to grind any interior outer cone surface with tubulose or difform metal parts.
Claims (7)
1. CONTACT WITH FRICTION is carried out with the surface of grinding stone (9) and the method for the conical surface (3) of abrasive metal part (1) in the surface (3) by part (1), wherein part (1) is around the axis rotation of the conical surface (3), grinding stone is done reciprocal translational motion along the direction that equals the angle of the conical surface (3) semiapex angle substantially of axis (4) inclination with respect to the conical surface (3), it is characterized in that, grinding stone (9) edge is perpendicular to the direction motion of the axis (4) of the conical surface (3), so that control grinding and feeding amount and grinding stone (9) lean against the pressure on metal parts (1) inner surface.
2. Ginding process according to claim 1, it is characterized in that, with the first grinding stage or the roughing stage of first grinding stone (9) processing with first kind of granularity, carry out in succession with the second grinding stage or the fine finishining stage of processing with second grinding stone (9) with second kind of granularity, it is thin that the granularity of second kind of fineness ratio first grinding stone (9) is wanted.
3. Ginding process according to claim 1 and 2 is characterized in that, fluid circulation when grinding is added on the conical surface (3), and fluid is added in circulation and grinds the conical surface (3) and reclaim before and filter.
4. the equipment of the conical surface of abrasive metal part (3), it comprises grinding stone (9), make the device of metal parts (1) around the axis rotation of the conical surface (3), and the tool rack (7) of grinding stone (9) and the being used for direction of angle that makes tool rack (7) tilt one to equal substantially the semiapex angle on frustum surface (3) along axis (4) device that carries out reciprocal translation with respect to the conical surface (3), the tool rack (7) of grinding stone (9) is mounted to and makes it can be on a machine bearing (19), pass through guider, along grinding stone (9) back and forth translation incline direction and move, it is characterized in that, machine bearing (19) is installed on the lathe bedstead (24), machine bearing (19) can be moved, so that grinding and feeding and pressure that control is ground along axis (4) direction of metal parts (1) conical surface (3) with perpendicular to the direction of the axis (4) of the conical surface (3).
5. equipment according to claim 4, it is characterized in that, tool rack (7) is fixed on the cylinder body (18a) of power cylinder, and the piston rod of power cylinder (18b) is fixed on the machine bearing (19) by moving slider (17), and moving slider can be gone up at machine bearing (19) by means of track-type facilities and move.
6. equipment according to claim 5, it is characterized in that, it comprises stroke terminal contactor (26a, 26b) with the retainer (27) that is fixed on the tool rack (7), so that change the direction of motion of the tool rack (7) of grinding stone (9) at the destination county of each reciprocation period of tool rack (7) by power cylinder (18).
7. according to each described equipment in the claim 4 to 6, it is characterized in that, by axle (11,11 ') and spring (14,14 '), grinding stone (9) is installed on the tool rack (7), and has along certain freedom of motion of the direction vertical with its reciprocal direction of translatory motion, spring (14,14 ') is with so that grinding stone (9) leaves tool rack (7).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9413857A FR2727046A1 (en) | 1994-11-18 | 1994-11-18 | METHOD AND DEVICE FOR LODGING A CONICAL SURFACE OF A METAL PART |
| FR9413857 | 1994-11-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1131600A true CN1131600A (en) | 1996-09-25 |
Family
ID=9468950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95119717A Pending CN1131600A (en) | 1994-11-18 | 1995-11-17 | Method and device for lapping conical surface of metal part |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0712689A2 (en) |
| KR (1) | KR960017054A (en) |
| CN (1) | CN1131600A (en) |
| FR (1) | FR2727046A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101157191B (en) * | 2007-09-18 | 2012-04-04 | 重庆川仪自动化股份有限公司 | Processing method of sapphire nozzle inner pyramidal face |
| CN105479322A (en) * | 2015-11-18 | 2016-04-13 | 中船黄埔文冲船舶有限公司 | Automatic conical hole grinding device |
| CN108145538A (en) * | 2017-11-29 | 2018-06-12 | 辽宁科技大学 | For the equipment and technique of the removal of bellows sieve pore burr |
| CN108188660A (en) * | 2017-12-22 | 2018-06-22 | 哈尔滨汽轮机厂有限责任公司 | A kind of method of highly-efficient processing elongate rod small taper hole |
| CN108705402A (en) * | 2018-07-18 | 2018-10-26 | 重庆炅达贸易有限公司 | Auto parts machinery process equipment |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101700645B (en) * | 2009-10-19 | 2011-07-27 | 北京中冶设备研究设计总院有限公司 | Horizontal type plating tank electric-conducting on-line honing method |
| CN102699656A (en) * | 2012-06-15 | 2012-10-03 | 青岛元通机械有限公司 | Conical surface segment mould processing method and segment mould |
| CN104511798A (en) * | 2014-12-11 | 2015-04-15 | 贵州红林机械有限公司 | Honing processing method for high-precision copper rotor plunger holes |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1586238A (en) * | 1924-03-19 | 1926-05-25 | Pratt & Whitney Co | Method and device for lapping gauges |
| US2244806A (en) * | 1936-03-11 | 1941-06-10 | Heald Machine Co | Honing apparatus |
| US2276611A (en) * | 1939-05-05 | 1942-03-17 | Micromatic Hone Corp | Honing device |
| EP0512757B1 (en) * | 1991-05-10 | 1995-12-13 | Hughes Aircraft Company | Apparatus for finishing a cone-like surface |
-
1994
- 1994-11-18 FR FR9413857A patent/FR2727046A1/en active Granted
-
1995
- 1995-11-06 EP EP95402475A patent/EP0712689A2/en not_active Withdrawn
- 1995-11-16 KR KR1019950041586A patent/KR960017054A/en not_active Application Discontinuation
- 1995-11-17 CN CN95119717A patent/CN1131600A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101157191B (en) * | 2007-09-18 | 2012-04-04 | 重庆川仪自动化股份有限公司 | Processing method of sapphire nozzle inner pyramidal face |
| CN105479322A (en) * | 2015-11-18 | 2016-04-13 | 中船黄埔文冲船舶有限公司 | Automatic conical hole grinding device |
| CN105479322B (en) * | 2015-11-18 | 2017-11-24 | 中船黄埔文冲船舶有限公司 | A kind of conical bore automatic grinding device |
| CN108145538A (en) * | 2017-11-29 | 2018-06-12 | 辽宁科技大学 | For the equipment and technique of the removal of bellows sieve pore burr |
| CN108188660A (en) * | 2017-12-22 | 2018-06-22 | 哈尔滨汽轮机厂有限责任公司 | A kind of method of highly-efficient processing elongate rod small taper hole |
| CN108705402A (en) * | 2018-07-18 | 2018-10-26 | 重庆炅达贸易有限公司 | Auto parts machinery process equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2727046B1 (en) | 1997-02-07 |
| KR960017054A (en) | 1996-06-17 |
| EP0712689A3 (en) | 1996-06-05 |
| EP0712689A2 (en) | 1996-05-22 |
| FR2727046A1 (en) | 1996-05-24 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |