CN103357928A - Method for repairing main screw hole of reactor pressure vessel - Google Patents
Method for repairing main screw hole of reactor pressure vessel Download PDFInfo
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- CN103357928A CN103357928A CN2013102644263A CN201310264426A CN103357928A CN 103357928 A CN103357928 A CN 103357928A CN 2013102644263 A CN2013102644263 A CN 2013102644263A CN 201310264426 A CN201310264426 A CN 201310264426A CN 103357928 A CN103357928 A CN 103357928A
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Abstract
The invention discloses a method for repairing a main screw hole of a reactor pressure vessel. According to the method, the severely damaged main screw hole of the reactor pressure vessel is subjected to micro hole expansion repairing by using a cyclone milling processing machine. Compared with the prior art, the method is not only high in repairing speed and high in machining efficiency, but also small in surface roughness of a machined thread, and the repairing can be carried out on site without being limited by the field and the structure.
Description
Technical field
The present invention relates to the reparation of nuclear power plant reactor pressure vessel master screw, more particularly, the present invention relates to a kind of reactor pressure vessel master screw restorative procedure.
Background technology
See also Fig. 1 and Fig. 2, in nuclear power station, it is the main screw 12 of M155 * 4 that 58 thread sizes are arranged on the flange face of reactor pressure vessel 10, and these main screws 12 are distributed on the circumference of Ф 4350 diameters.Reactor pressure vessel 10 is at stages such as manufacturing, installation, operation, maintenances, and main screw 12 all may damage, and therefore need to repair.
The main screw 12 that is damaged for screw thread in installing at the scene, the conventional means of repairing is with the reparation of manual expansion chasing tool, cutter adopts the carbide alloy forming cutter of adaptive M155 * 4 full thread tooth forms, and tooling system is come the balance own wt by lever, by the hand drive feeding.Although the expansion chasing tool can be realized the simple reparation of double thread by adjusting the expansion chasing tool cutter amount that rises, but owing to be manual operations, cutting force can not be very large, so cutting output is very little, can only repair small defective, repair the central diameter of rear thread still in the margin of tolerance.As seen, the method can't be repaired by the larger main screw 12 of double thread damage.
For the serious main screw 12 of damage, use conventional means (chasing tool, polishing) in the time of can't repairing, need on the basis of original thread M155 * 4, reaming just can eliminate defective fully to M157 * 4, to satisfy reactor pressure vessel in the nuclear power station instructions for use of full phase in longevity.Adopt the technology of boring machine low speed boring screw thread, can realize that along the original thread the line of cut main screw 12 being carried out reaming reprocesses.See also Fig. 3 and Fig. 4, low speed screw thread boring machine is fixed on the flange face of reactor pressure vessel 10, after the screw thread centering with boring cutter 22 and main screw 12, can realize processing.But, because the boring cutter 22 of boring machine can only be around main shaft 24 rotations of lathe, the circular motion of boring cutter 22 and planker 26 is rotarily driven by machine tool chief axis 24, consider the rigidity of equipment, main shaft 24 can only be done low speed rotation, therefore cutting speed is very low, and this can make the thread surface roughness that processes larger.
In view of this, necessaryly provide a kind of and can carry out the efficient reactor pressure vessel master screw restorative procedure of accurately repairing to damaging serious main screw.
Summary of the invention
The object of the invention is to: provide a kind of efficient accurate reactor pressure vessel master screw restorative procedure, to realize carrying out on-the-spot reaming reparation to damaging serious main screw.
In order to realize the foregoing invention purpose, the invention provides a kind of reactor pressure vessel master screw restorative procedure, it adopts the milling with whirling cutter processing machine to carry out the reaming reparation of trace to damaging serious reactor pressure vessel master screw.
As a kind of improvement of reactor pressure vessel master screw restorative procedure of the present invention, it may further comprise the steps: 1) processing machine is installed: the mode that adopts frock to connect is installed in the milling with whirling cutter processing machine on the flange face of reactor pressure vessel; 2) centering: the dead in line that the machine tool chief axis of milling with whirling cutter processing machine is adjusted to and waits to reprocess main screw; 3) tool setting: the forming cutter of milling with whirling cutter processing machine is aimed at the original thread the line of cut; 4) machining: the machining of carrying out screw thread by cutting direction from top to bottom.
A kind of improvement as reactor pressure vessel master screw restorative procedure of the present invention, it is that the frock bolt is inserted in two screws adjacent with main screw to be processed that the described frock of step 1) connects, the frock connecting plate is installed on the flange face of reactor pressure vessel, again the milling with whirling cutter processing machine is installed on the frock connecting plate.
As a kind of improvement of reactor pressure vessel master screw restorative procedure of the present invention, step 2) behind the centering, use the pressing plate on the frock connecting plate to fix the milling with whirling cutter processing machine, and again check the axiality of machine tool chief axis and main screw.
A kind of improvement as reactor pressure vessel master screw restorative procedure of the present invention, described step 2) concrete steps are, main shaft at the milling with whirling cutter processing machine is installed a dial gauge, make the external part of dial gauge contact the upper unthreaded hole of main screw to be processed and the hole wall of lower unthreaded hole, read the jitter values of dial gauge by rotary main shaft, be adjusted to main screw the lathe of milling with whirling cutter processing machine coaxial.
A kind of improvement as reactor pressure vessel master screw restorative procedure of the present invention, the tool setting step of described step 3) is: transmission case and the leading screw of throwing off first the milling with whirling cutter processing machine, make transmission case can carry out stepless moving up and down, then drive the milling with whirling cutter processing machine, make the forming cutter of facing cutter move to the screw thread place that main screw top is not damaged and carry out tool setting, use the outer contour of endoscope visualization forming cutter whether to fit with form of thread; After adjusting the applying degree of forming cutter and ridge, the geared assembly of locking transmission case and leading screw guarantees that the transmission case rotation moves up and down a pitch once enclosing.
A kind of improvement as reactor pressure vessel master screw restorative procedure of the present invention, after the described step 3) tool setting, in order to check the accuracy of tool setting, the thread segment that needs selection not to be damaged, shut down after forming cutter moved up and down certain depth, whether radial feed and the outer contour of observing forming cutter fit with form of thread; Cutter position is carried out at three places, upper, middle and lower of screwed hole at least, and the tool setting of every place is carried out at mutually perpendicular four direction.
As a kind of improvement of reactor pressure vessel master screw restorative procedure of the present invention, the Cutting Parameters of described step 4) is: the rotating speed of main shaft is 1.5rpm, and the rotating speed of axle II is 810rpm, and each radial feed amount is 0.1mm; When residue cutting output≤0.15mm, need according to screw thread target central diameter value, determine again the depth of cut after calculating the residue cutting output, walk in case of necessity sky cutter double thread and revise.
A kind of improvement as reactor pressure vessel master screw restorative procedure of the present invention, during described step 4) machining, whenever after finishing one-pass, the screw thread that need avoid damaging, to the screw thread of three parts in upper, middle and lower of institute's chasing, respectively in the central diameter of the position measurements 1 button screw thread of 0～180 degree, 45～225 degree, 90～270 degree and 135～315 degree; After machining was finished, double thread carried out one or more inspections that visual examination, go-no go gauge inspection and central diameter are measured.
As a kind of improvement of reactor pressure vessel master screw restorative procedure of the present invention, during described step 4) machining, after twice of every feed, need to change shaping blades and check that blade end jumps, require end to jump less than 0.04mm; Adopt air cooling to add oil cooling during trial cut, adopt the emulsion cooling when normally cutting.
Compared with prior art, the present invention not only repairs the speed height, working (machining) efficiency is fast, and the thread surface roughness that processes is little, and repair also can be carried out at the scene because of the restriction that is not subjected to place and structure.
Description of drawings
Below in conjunction with the drawings and specific embodiments, reactor pressure vessel master screw restorative procedure of the present invention, beneficial effect are elaborated, wherein:
Fig. 1 is the structural representation of nuclear power plant reactor pressure vessel.
Fig. 2 is the schematic top plan view of nuclear power plant reactor pressure vessel.
Fig. 3 is for carrying out the structural representation of boring machine cutting reaming to the main thread hole.
Fig. 4 is for carrying out the schematic top plan view of boring machine cutting reaming to the main thread hole.
Fig. 5 is the structural representation of milling with whirling cutter processing machine used in the present invention.
Fig. 6 is the structural representation of the facing cutter among Fig. 5.
Fig. 7 is main Screw hole structure schematic diagram to be repaired.
The processing machine scheme of installation of Fig. 8 reactor pressure vessel master of the present invention screw restorative procedure.
Fig. 9 and Figure 10 are the centering schematic diagram of reactor pressure vessel master screw restorative procedure of the present invention.
Figure 11 is the tool setting schematic diagram of reactor pressure vessel master screw restorative procedure of the present invention.
The specific embodiment
In order to make goal of the invention of the present invention, technical scheme and useful technique effect thereof more clear, below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.Should be understood that the specific embodiment of describing in this specification only is in order to explain the present invention, is not in order to limit the present invention.
In order to realize carrying out efficient accurate the reparation to damaging serious main screw, the invention provides the method that a kind of mode of utilizing milling with whirling cutter is carried out on-the-spot reaming to damaging serious main screw.For ease of explanation, below at first milling with whirling cutter technology and related tool are simply described.
The milling with whirling cutter internal thread is a kind of method of machining large-sized internal thread hole, it adopts the carbide alloy forming cutter that is contained on the High Rotation Speed cutterhead, the workpiece that has machined at thread Pilot hole mills out complete internal thread, because Milling Speed is high, working (machining) efficiency is gained the name soon, generally be used for machining large-sized internal thread in manufactory.
See also Fig. 5 and shown in Figure 6, the milling with whirling cutter processing machine that the present invention adopts is the multi-functional internal thread machining machine of vertical portable formula, and it comprises transmission case 60, collar bush 62, eccentric mounting 64, facing cutter 66 and universal drive shaft 68.
Transmission case 60 is connected with the feeding motor by leading screw, and collar bush 62 is installed in the transmission case 60, eccentric mounting 64 be fixedly arranged on collar bush 62 an end and with its sealing.Eccentric mounting 64 is done the low speed circular motion by gear set drive.
Facing cutter 66 comprises installing department 660, cutterhead 662 and forming cutter 664.Offer the installation hole 666 that laterally runs through on the installing department 660, cutterhead 662 is installed in an end of installing department 660, and forming cutter 664 edegewise ground evenly are arranged on the circumference of cutterhead 662.What forming cutter 664 adopted is the carbide alloy forming cutter of adaptive M155 * 4 full thread tooth forms.
The installing department 660 of facing cutter 66 is installed on the eccentric mounting 64 and departs from circle centre position, its cutterhead 662 from eccentric mounting 64 to stretching out away from the direction of collar bush 62.
Universal drive shaft 68 is by main driven by motor, and it is installed in the collar bush 62, and is connected with the installing department of facing cutter 66.
During use, main motor drives facing cutter 66 by universal drive shaft 68 and does principal cutting movement around axle II High Rotation Speed, the feeding motor drives transmission case 60 by leading screw and does axial feed motion, do the low speed circular motion by gear set drive eccentric mounting 64 around the main shaft I simultaneously: eccentric mounting 64 whenever rotates a circle around the main shaft I, transmission case 60 is the long distance of a mobile pitch just, thereby synthesizes the working motion of internal thread with cutting movement.Wherein, pitch can be adjusted accordingly according to the screw thread specification difference of processing, and the axle II can eccentric mounting 64 interior moving radially, make facing cutter 66 realize radial feed, thereby process the screw thread of different size.
See also main screw 12 shown in Figure 7, to be repaired and comprise unthreaded hole 120, screwed hole 122 and lower unthreaded hole 124.Upper unthreaded hole 120, screwed hole 122 and lower unthreaded hole 124 are coaxial aperture, and three's axis i.e. the axis of main screw 12; The thread size of screwed hole 122 is M155 * 4.Because main screw 12 damages in installation process seriously, by dredging cutter or polishing and all can not repair, the mode that therefore must take to carry out reaming along the original thread the line of cut is repaired, and is about to screw thread and is worked into M157 * 4 by M155 * 4.
The step that the present invention uses the multi-functional internal thread machining machine of vertical portable formula that reactor pressure vessel master screw is repaired is:
1) processing machine is installed: what the milling with whirling cutter processing machine adopted usually is that the mode that electromagnetism adsorbs is fixed on the workpiece to be machined, the present invention adopts frock to connect in order to guarantee to install firmly: see also Fig. 8, utilize two screws 12 adjacent with main screw to be processed 12, use frock bolt 70 that a frock connecting plate 72 is installed on the flange face of reactor pressure vessel 10, afterwards the milling with whirling cutter processing machine is installed on the frock connecting plate 72;
2) centering: the milling with whirling cutter processing machine need be adjusted after installing, and the dead in line that makes its main shaft I and wait to reprocess main screw 12 for this reason, is installed a dial gauge 74 at the main shaft I of milling with whirling cutter processing machine.See also Fig. 9 and Figure 10, make the external part of dial gauge 74 contact respectively the upper unthreaded hole 120 of main screw 12 to be processed and the hole wall of lower unthreaded hole 124, read the jitter values of dial gauge 72 by rotary main shaft I, thereby be adjusted to main screw 12 lathe of milling with whirling cutter processing machine coaxial; Pressing plate 73(behind the centering on the use frock connecting plate 72 is as shown in Figure 8) fix the milling with whirling cutter processing machine, and again check the axiality of machine tool chief axis I and main screw 12;
3) tool setting: because will cut along the original thread the line of cut of main screw 12, therefore the forming cutter 664 of facing cutter 66 must be aimed at the original thread the line of cut: throw off first transmission case 60 and leading screw, make transmission case 60 can carry out stepless moving up and down, then drive the milling with whirling cutter processing machine, make the forming cutter 664 of facing cutter 66 move to the screw thread place that main screw 12 tops are not damaged and carry out tool setting, see also Figure 11, use the outer contour of endoscope visualization forming cutter 664 whether to fit with form of thread; After adjusting the applying degree of forming cutter 664 and ridge 128, the geared assembly of locking machine tool driving box 60 and leading screw guarantees that transmission case 60 rotations move up and down a pitch once enclosing; In order to check the accuracy of tool setting, select the thread segment that is not damaged, after being moved up and down certain depth, forming cutter 664 shuts down, and whether radial feed and the outer contour of observing forming cutter 664 fit with form of thread; Cutter position is carried out at three places, upper, middle and lower of screwed hole 122 at least, and the tool setting of every place is carried out at mutually perpendicular four direction;
4) machining: carry out the machining of screw thread by cutting direction from top to bottom, the rotating speed of main shaft I is 1.5rpm, and the rotating speed of axle II is about 810rpm, and each radial feed amount is 0.1mm; Adopt air cooling to add oil cooling during trial cut, adopt the emulsion cooling when normally cutting; Whenever after finishing one-pass, the screw thread of avoiding damaging is to the screw thread of three parts in upper, middle and lower of institute's chasing, respectively in the central diameter of the position measurements 1 button screw thread of 0～180 degree, 45～225 degree, 90～270 degree and 135～315 degree; After twice of every feed, more allowing blade replacement and check that blade end jumps requires end to jump less than 0.04mm; When residue cutting output≤0.15mm, according to screw thread target central diameter value φ 154.58, determine again the depth of cut after calculating the residue cutting output, walk in case of necessity sky cutter double thread and revise; After machining, check by mode double threads such as visual examination, go-no go gauge inspection and central diameter measurements.
In sum, reactor pressure vessel master screw restorative procedure of the present invention is by the mode of milling with whirling cutter, and reactor pressure vessel master screw 12 from M155 * 4 reamings to M157 * 4, and then is eliminated the defective that the use conventional means that exists on the original thread can't be repaired.Compared with prior art, the present invention not only repairs the speed height, working (machining) efficiency is fast, and the thread surface roughness that processes is little, and repair also can be carried out at the scene because of the restriction that is not subjected to place and structure.
The according to the above description announcement of book and instruction, those skilled in the art in the invention can also carry out suitable change and modification to above-mentioned embodiment.Therefore, the specific embodiment that discloses and describe above the present invention is not limited to also should fall in the protection domain of claim of the present invention modifications and changes more of the present invention.In addition, although used some specific terms in this specification, these terms do not consist of any restriction to the present invention just for convenience of description.
Claims (10)
1. a reactor pressure vessel master screw restorative procedure is characterized in that: adopt the milling with whirling cutter processing machine to carry out the reaming reparation of trace to damaging serious reactor pressure vessel master screw.
2. reactor pressure vessel master screw restorative procedure according to claim 1 is characterized in that: may further comprise the steps:
1) processing machine is installed: the mode that adopts frock to connect is installed in the milling with whirling cutter processing machine on the flange face of reactor pressure vessel;
2) centering: the dead in line that the machine tool chief axis of milling with whirling cutter processing machine is adjusted to and waits to reprocess main screw;
3) tool setting: the forming cutter of milling with whirling cutter processing machine is aimed at the original thread the line of cut;
4) machining: the machining of carrying out screw thread by cutting direction from top to bottom.
3. reactor pressure vessel master screw restorative procedure according to claim 2, it is characterized in that: it is that the frock bolt is inserted in two screws adjacent with main screw to be processed that the described frock of step 1) connects, the frock connecting plate is installed on the flange face of reactor pressure vessel, again the milling with whirling cutter processing machine is installed on the frock connecting plate.
4. reactor pressure vessel master screw restorative procedure according to claim 3 is characterized in that: step 2) behind the centering, use the pressing plate on the frock connecting plate to fix the milling with whirling cutter processing machine, and again check the axiality of machine tool chief axis and main screw.
5. reactor pressure vessel master screw restorative procedure according to claim 2, it is characterized in that: concrete steps described step 2) are, main shaft at the milling with whirling cutter processing machine is installed a dial gauge, make the external part of dial gauge contact the upper unthreaded hole of main screw to be processed and the hole wall of lower unthreaded hole, read the jitter values of dial gauge by rotary main shaft, be adjusted to main screw the lathe of milling with whirling cutter processing machine coaxial.
6. reactor pressure vessel master screw restorative procedure according to claim 2, it is characterized in that: the tool setting step of described step 3) is: transmission case and the leading screw of throwing off first the milling with whirling cutter processing machine, make transmission case can carry out stepless moving up and down, then drive the milling with whirling cutter processing machine, make the forming cutter of facing cutter move to the screw thread place that main screw top is not damaged and carry out tool setting, use the outer contour of endoscope visualization forming cutter whether to fit with form of thread; After adjusting the applying degree of forming cutter and ridge, the geared assembly of locking transmission case and leading screw.
7. reactor pressure vessel master screw restorative procedure according to claim 6, it is characterized in that: after the described step 3) tool setting, in order to check the accuracy of tool setting, the thread segment that needs selection not to be damaged, shut down after forming cutter moved up and down certain depth, whether radial feed and the outer contour of observing forming cutter fit with form of thread; Cutter position is carried out at three places, upper, middle and lower of screwed hole at least, and the tool setting of every place is carried out at mutually perpendicular four direction.
8. reactor pressure vessel master screw restorative procedure according to claim 2, it is characterized in that: the Cutting Parameters of described step 4) is: the rotating speed of main shaft is 1.5rpm, and the rotating speed of axle II is 810rpm, and each radial feed amount is 0.1mm; When residue cutting output≤0.15mm, need according to screw thread target central diameter value, determine again the depth of cut after calculating the residue cutting output, walk in case of necessity sky cutter double thread and revise.
9. reactor pressure vessel master screw restorative procedure according to claim 2, it is characterized in that: during described step 4) machining, whenever after finishing one-pass, the screw thread that need avoid damaging, to the screw thread of three parts in upper, middle and lower of institute's chasing, respectively in the central diameter of the position measurements 1 button screw thread of 0～180 degree, 45～225 degree, 90～270 degree and 135～315 degree; After machining was finished, double thread carried out one or more inspections that visual examination, go-no go gauge inspection and central diameter are measured.
10. reactor pressure vessel master screw restorative procedure according to claim 2 is characterized in that: during described step 4) machining, after twice of every feed, need to change shaping blades and check that blade end jumps, require end to jump less than 0.04mm; Adopt air cooling to add oil cooling during trial cut, adopt the emulsion cooling when normally cutting.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105537847A (en) * | 2015-12-18 | 2016-05-04 | 中广核研究院有限公司 | Thread combing device for large-caliber internal threads |
| CN105817831A (en) * | 2016-05-13 | 2016-08-03 | 中广核研究院有限公司 | Threaded hole defect detecting and repairing method and device for large container and device of nuclear power plant |
| CN105904042A (en) * | 2016-06-30 | 2016-08-31 | 中广核研究院有限公司 | Internal thread local defect milling mechanism |
| CN105945371A (en) * | 2016-06-30 | 2016-09-21 | 中广核研究院有限公司 | Internal thread local defect repairing device and method |
| CN106513876A (en) * | 2015-09-11 | 2017-03-22 | 安东检测有限公司 | Coping plate, coping device and coping equipment |
| CN109551064A (en) * | 2018-12-24 | 2019-04-02 | 内蒙古北方重工业集团有限公司 | The broach-milling processing method of the nonstandard dextrorotation internal screw thread of major diameter |
| CN113814649A (en) * | 2021-08-13 | 2021-12-21 | 株洲中车天力锻业有限公司 | Online repairing device and method for inner wall of circular hole |
| CN114273716A (en) * | 2021-12-03 | 2022-04-05 | 苏州热工研究院有限公司 | Cutting device for reactor pressure vessel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106513876A (en) * | 2015-09-11 | 2017-03-22 | 安东检测有限公司 | Coping plate, coping device and coping equipment |
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| CN109551064A (en) * | 2018-12-24 | 2019-04-02 | 内蒙古北方重工业集团有限公司 | The broach-milling processing method of the nonstandard dextrorotation internal screw thread of major diameter |
| CN113814649A (en) * | 2021-08-13 | 2021-12-21 | 株洲中车天力锻业有限公司 | Online repairing device and method for inner wall of circular hole |
| CN114273716A (en) * | 2021-12-03 | 2022-04-05 | 苏州热工研究院有限公司 | Cutting device for reactor pressure vessel |
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| CN103357928B (en) | 2016-03-02 |
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