CN103357928B - The main screw restorative procedure of reactor pressure vessel - Google Patents
The main screw restorative procedure of reactor pressure vessel Download PDFInfo
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- CN103357928B CN103357928B CN201310264426.3A CN201310264426A CN103357928B CN 103357928 B CN103357928 B CN 103357928B CN 201310264426 A CN201310264426 A CN 201310264426A CN 103357928 B CN103357928 B CN 103357928B
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Abstract
The invention discloses the main screw restorative procedure of a kind of reactor pressure vessel, it adopts milling with whirling cutter processing machine to carry out the reaming reparation of trace to the serious main screw of reactor pressure vessel of damage.Compared with prior art, the present invention not only repairs that speed is high, working (machining) efficiency is fast, and the thread surface roughness processed is little, and repair is not also because carrying out at the scene by the restriction of place and structure.
Description
Technical field
The present invention relates to the reparation of the main screw of nuclear power plant reactor pressure vessel, more particularly, the present invention relates to the main screw restorative procedure of a kind of reactor pressure vessel.
Background technology
Refer to Fig. 1 and Fig. 2, in nuclear power station, the flange face of reactor pressure vessel 10 has 58 thread sizes be the main screw 12 of M155 × 4, these main screws 12 are distributed on Ф 4350 diameter circumferentially.Reactor pressure vessel 10 is in each stages such as manufacture, installation, operation, maintenances, and main screw 12 all may damage, and therefore needs to repair.
For the main screw 12 that is damaged of screw thread in installing at the scene, the conventional means repaired is with the reparation of manual expansion chasing tool, cutter adopts the carbide alloy forming cutter of adaptive M155 × 4 full thread tooth form, and tooling system balances own wt by lever, by hand drive feeding.Although expansion chasing tool can realize the simple reparation of double thread by the adjustment expansion chasing tool cutter amount that rises, but owing to being manual operations, cutting force can not be very large, so cutting output is very little, small defect can only be repaired, repair the central diameter of rear thread still in the margin of tolerance.Visible, the method cannot be repaired by the larger main screw 12 of double thread damage.
For the main screw 12 that damage is serious, when using conventional means (chasing tool, polishing) to repair, reaming just defect need can be eliminated completely to M157 × 4, to meet the instructions for use of reactor pressure vessel in the nuclear power station full phase in longevity on the basis of original thread M155 × 4.Adopt the technology of boring machine low speed boring screw thread, can realize, along original thread the line of cut, reaming is carried out to main screw 12 and reprocess.Refer to Fig. 3 and Fig. 4, low speed screw thread boring machine is fixed on the flange face of reactor pressure vessel 10, by after boring cutter 22 and the screw thread centering of main screw 12, processing can be realized.But, because the boring cutter 22 of boring machine can only rotate around the main shaft 24 of lathe, circular motion the rotarily driving by machine tool chief axis 24 of boring cutter 22 and planker 26, consider the rigidity of equipment, main shaft 24 can only do 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 main screw restorative procedure of reactor pressure vessel accurately repaired to the serious main screw of damage.
Summary of the invention
The object of the invention is to: a kind of efficient accurate main screw restorative procedure of reactor pressure vessel is provided, to realize carrying out on-the-spot reaming reparation to the serious main screw of damage.
In order to realize foregoing invention object, the invention provides the main screw restorative procedure of a kind of reactor pressure vessel, it adopts milling with whirling cutter processing machine to carry out the reaming reparation of trace to the serious main screw of reactor pressure vessel of damage.
One as the main screw restorative procedure of reactor pressure vessel of the present invention is improved, and it comprises the following steps: 1) processing machine is installed: milling with whirling cutter processing machine is arranged on the flange face of reactor pressure vessel by the mode adopting frock to connect; 2) centering: the machine tool chief axis of milling with whirling cutter processing machine is adjusted to and waits the dead in line of reprocessing main screw; 3) tool setting: the forming cutter of milling with whirling cutter processing machine is aimed at original thread the line of cut; 4) machining: the machining of carrying out screw thread by cutting direction from top to bottom.
One as the main screw restorative procedure of reactor pressure vessel of the present invention is improved, it is inserted by frock bolt in two screws adjacent with main screw to be processed that frock described in step 1) connects, frock connecting plate is arranged on the flange face of reactor pressure vessel, then milling with whirling cutter processing machine is arranged on frock connecting plate.
One as the main screw restorative procedure of reactor pressure vessel of the present invention is improved, step 2) after centering, use the pressing plate on frock connecting plate to fix milling with whirling cutter processing machine, and again check the axiality of machine tool chief axis and main screw.
One as the main screw restorative procedure of reactor pressure vessel of the present invention is improved, described step 2) concrete steps be, a dial gauge installed by the main shaft of milling with whirling cutter processing machine, the external part of dial gauge is made to 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, the lathe of milling with whirling cutter processing machine is adjusted to main screw coaxial.
One as the main screw restorative procedure of reactor pressure vessel of the present invention is improved, the tool setting step of described step 3) is: transmission case and the leading screw of first throwing off milling with whirling cutter processing machine, transmission case is made to carry out stepless moving up and down, then milling with whirling cutter processing machine is driven, the forming cutter of facing cutter is moved to, and screw thread place that main screw top is not damaged carries out tool setting, and whether the outer contour using endoscopic visual to observe forming cutter fits with form of thread; After the laminating degree of adjustment forming cutter and ridge, the geared assembly of locking transmission case and leading screw, ensures that transmission case rotates and moves up and down a pitch once enclosing.
One as the main screw restorative procedure of reactor pressure vessel of the present invention is improved, after described step 3) tool setting, in order to check the accuracy of tool setting, the thread segment be not damaged need be selected, shut down after forming cutter being moved up and down certain depth, whether radial feed the outer contour observing forming cutter fit with form of thread; Cutter position is at least carried out at upper, middle and lower three place of screwed hole, often locates tool setting and carry out on mutually perpendicular four direction.
One as the main screw restorative procedure of reactor pressure vessel of the present invention is improved, and 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 remaining cutting output≤0.15mm, according to screw thread target central diameter value, the depth of cut need be determined again after calculating residue cutting output, walks sky cutter double thread if desired and revise.
One as the main screw restorative procedure of reactor pressure vessel of the present invention is improved, during described step 4) machining, after often completing one-pass, the screw thread damaged need be avoided, to the screw thread of three parts in upper, middle and lower of institute's chasing, detain the central diameter of screw thread respectively in the position measurement 1 of 0 ~ 180 degree, 45 ~ 225 degree, 90 ~ 270 degree and 135 ~ 315 degree; After machining completes, double thread carries out one or more inspections that visual examination, go-no go gauge inspection and central diameter are measured.
One as the main screw restorative procedure of reactor pressure vessel of the present invention is improved, and during described step 4) machining, after every feed twice, need change shaping blades and check that blade end is jumped, and requires that end jumping is less than 0.04mm; Adopt air cooling to add oil cooling during trial cut, during normal cutting, adopt emulsion cooling.
Compared with prior art, the present invention not only repairs that speed is high, working (machining) efficiency is fast, and the thread surface roughness processed is little, and repair is not also because carrying out at the scene by the restriction of place and structure.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the main screw restorative procedure of reactor pressure vessel of the present invention, beneficial effect are described in detail, 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 carries out to main thread hole the structural representation that boring machine cuts reaming.
Fig. 4 carries out to main thread hole the schematic top plan view that boring machine cuts reaming.
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 in Fig. 5.
Fig. 7 is main Screw hole structure schematic diagram to be repaired.
The processing machine scheme of installation of the main screw restorative procedure of Fig. 8 reactor pressure vessel of the present invention.
Fig. 9 and Figure 10 is the centering schematic diagram of the main screw restorative procedure of reactor pressure vessel of the present invention.
Figure 11 is the tool setting schematic diagram of the main screw restorative procedure of reactor pressure vessel of the present invention.
Detailed description of the invention
In order to make goal of the invention of the present invention, technical scheme and Advantageous Effects thereof more clear, below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.Should be understood that, the detailed description of the invention described in this description is only used to explain the present invention, is not intended to limit the present invention.
In order to realize carrying out efficient accurate reparation to the serious main screw of damage, the invention provides a kind of mode of milling with whirling cutter that utilizes and the method for on-the-spot reaming is carried out to the serious main screw of damage.For ease of illustrating, first milling with whirling cutter technology and related tool are simply described below.
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 be contained on High Rotation Speed cutterhead, the workpiece that thread Pilot hole has machined mills out complete internal thread, gain the name because Milling Speed is high, working (machining) efficiency fast, be commonly used to machining large-sized internal thread in manufactory.
Refer to shown in Fig. 5 and Fig. 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 feeding motor by leading screw, and collar bush 62 is installed in transmission case 60, and eccentric mounting 64 is fixedly arranged on one end of collar bush 62 and is sealed.Eccentric mounting 64 is done low speed circular motion by gear set drive.
Facing cutter 66 comprises installing department 660, cutterhead 662 and forming cutter 664.Installing department 660 offers the installation hole 666 laterally run through, cutterhead 662 is installed in one end of installing department 660, is evenly arranged in cutterhead 662 circumferentially forming cutter 664 edegewise.What forming cutter 664 adopted is the carbide alloy forming cutter of adaptive M155 × 4 full thread tooth form.
The installing department 660 of facing cutter 66 is arranged on eccentric mounting 64 and departs from circle centre position, and its cutterhead 662 stretches out to the direction away from collar bush 62 from eccentric mounting 64.
Universal drive shaft 68 is driven by mair motor, and it is installed in collar bush 62, and is connected with the installing department of facing cutter 66.
During use, mair motor drives facing cutter 66 to do principal cutting movement around axle II High Rotation Speed by universal drive shaft 68, feeding motor drives transmission case 60 to do axial feed motion by leading screw, do low speed circular motion by gear set drive eccentric mounting 64 around main shaft I: eccentric mounting 64 often rotates a circle around main shaft I simultaneously, transmission case 60 distance that just a mobile pitch is long, thus synthesize 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 axle II can move radially in eccentric mounting 64, makes facing cutter 66 realize radial feed, thus processes the screw thread of different size.
Refer to shown in Fig. 7, main screw 12 to be repaired comprises 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, the axis of three and the axis of main screw 12; The thread size of screwed hole 122 is M155 × 4.Because main screw 12 damages seriously in installation process, all can not be repaired by thin cutter or polishing, the mode of carrying out reaming along original thread the line of cut therefore must be taked to repair, be worked into M157 × 4 by screw thread by M155 × 4.
The present invention uses vertical portable formula multi-functional internal thread machining machine to the step that the main screw of reactor pressure vessel is repaired to be:
1) processing machine is installed: the mode of electromagnetic adsorption that what milling with whirling cutter processing machine adopted usually is is fixed on workpiece to be machined, the present invention adopts frock to connect to ensure to install firmly: refer to Fig. 8, utilize two screws 12 adjacent with main screw 12 to be processed, use frock bolt 70 to be arranged on the flange face of reactor pressure vessel 10 by one piece of frock connecting plate 72, afterwards milling with whirling cutter processing machine is arranged on frock connecting plate 72;
2) centering: milling with whirling cutter processing machine needs to adjust after installing, makes its main shaft I and the dead in line of waiting to reprocess main screw 12, for this reason, the main shaft I of milling with whirling cutter processing machine installs a dial gauge 74.Refer to Fig. 9 and Figure 10, the external part of dial gauge 74 is made to contact the upper unthreaded hole 120 of main screw 12 to be processed and the hole wall of lower unthreaded hole 124 respectively, read the jitter values of dial gauge 72 by rotary main shaft I, thus the lathe of milling with whirling cutter processing machine is adjusted to main screw 12 coaxial; The pressing plate 73(on frock connecting plate 72 is used as shown in Figure 8 after centering) fix 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 aim at original thread the line of cut: first throw off transmission case 60 and leading screw, transmission case 60 is made to carry out stepless moving up and down, then milling with whirling cutter processing machine is driven, the forming cutter 664 of facing cutter 66 is moved to, and screw thread place that main screw 12 top is not damaged carries out tool setting, refer to Figure 11, whether the outer contour using endoscopic visual to observe forming cutter 664 fits with form of thread; After the laminating degree of adjustment forming cutter 664 and ridge 128, the geared assembly of locking machine tool driving box 60 and leading screw, ensures that transmission case 60 rotates and moves up and down a pitch once enclosing; In order to check the accuracy of tool setting, selecting the thread segment that is not damaged, shutting down after forming cutter 664 is moved up and down certain depth, whether radial feed the outer contour observing forming cutter 664 fit with form of thread; Cutter position is at least carried out at upper, middle and lower three place of screwed hole 122, often locates tool setting and carry out on mutually perpendicular four direction;
4) machining: the machining of carrying out 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, during normal cutting, adopt emulsion cooling; After often completing one-pass, avoid the screw thread damaged, to the screw thread of three parts in upper, middle and lower of institute's chasing, detain the central diameter of screw thread respectively in the position measurement 1 of 0 ~ 180 degree, 45 ~ 225 degree, 90 ~ 270 degree and 135 ~ 315 degree; After every feed twice, more allowing blade replacement check that blade end is jumped, requires that end jumping is less than 0.04mm; When remaining cutting output≤0.15mm, according to screw thread target central diameter value φ 154.58, determining the depth of cut again after calculating residue cutting output, walking sky cutter double thread if desired and revise; After machining, checked by mode double threads such as visual examination, go-no go gauge inspection and central diameter measurements.
In sum, the main screw restorative procedure of reactor pressure vessel of the present invention, by the mode of milling with whirling cutter, by main for reactor pressure vessel screw 12 from M155 × 4 reaming to M157 × 4, and then eliminates the defect that use conventional means that original thread exists cannot repair.Compared with prior art, the present invention not only repairs that speed is high, working (machining) efficiency is fast, and the thread surface roughness processed is little, and repair is not also because carrying out at the scene by the restriction of place and structure.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also carry out suitable change and amendment to above-mentioned embodiment.Therefore, the present invention is not limited to detailed description of the invention disclosed and described above, also should fall in the protection domain of claim of the present invention modifications and changes more of the present invention.In addition, although employ some specific terms in this description, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (9)
1. the main screw restorative procedure of reactor pressure vessel, is characterized in that: adopt milling with whirling cutter processing machine to carry out the reaming reparation of trace to the serious main screw of reactor pressure vessel of damage, restorative procedure comprises the following steps:
1) processing machine is installed: milling with whirling cutter processing machine is arranged on the flange face of reactor pressure vessel by the mode adopting frock to connect;
2) centering: the machine tool chief axis of milling with whirling cutter processing machine is adjusted to and waits the dead in line of reprocessing main screw;
3) tool setting: the forming cutter of milling with whirling cutter processing machine is aimed at original thread the line of cut;
4) machining: the machining of carrying out screw thread by cutting direction from top to bottom.
2. the main screw restorative procedure of reactor pressure vessel according to claim 1, it is characterized in that: step 1) described in frock to connect be insert in two screws adjacent with main screw to be processed by frock bolt, frock connecting plate is arranged on the flange face of reactor pressure vessel, then milling with whirling cutter processing machine is arranged on frock connecting plate.
3. the main screw restorative procedure of reactor pressure vessel according to claim 2, is characterized in that: step 2) after centering, use the pressing plate on frock connecting plate to fix milling with whirling cutter processing machine, and again check the axiality of machine tool chief axis and main screw.
4. the main screw restorative procedure of reactor pressure vessel according to claim 1, it is characterized in that: described step 2) concrete steps be, a dial gauge installed by the main shaft of milling with whirling cutter processing machine, the external part of dial gauge is made to 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, the lathe of milling with whirling cutter processing machine is adjusted to main screw coaxial.
5. the main screw restorative procedure of reactor pressure vessel according to claim 1, it is characterized in that: described step 3) tool setting step be: transmission case and the leading screw of first throwing off milling with whirling cutter processing machine, transmission case is made to carry out stepless moving up and down, then milling with whirling cutter processing machine is driven, the forming cutter of facing cutter is moved to, and screw thread place that main screw top is not damaged carries out tool setting, and whether the outer contour using endoscopic visual to observe forming cutter fits with form of thread; After the laminating degree of adjustment forming cutter and ridge, the geared assembly of locking transmission case and leading screw.
6. the main screw restorative procedure of reactor pressure vessel according to claim 5, it is characterized in that: described step 3) after tool setting, in order to check the accuracy of tool setting, the thread segment be not damaged need be selected, shut down after forming cutter being moved up and down certain depth, whether radial feed the outer contour observing forming cutter fit with form of thread; Cutter position is at least carried out at upper, middle and lower three place of screwed hole, often locates tool setting and carry out on mutually perpendicular four direction.
7. the main screw restorative procedure of reactor pressure vessel according to claim 1, is characterized in that: described step 4) Cutting Parameters be: 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 remaining cutting output≤0.15mm, according to screw thread target central diameter value, after calculating residue cutting output, the depth of cut need be determined again.
8. the main screw restorative procedure of reactor pressure vessel according to claim 1, it is characterized in that: described step 4) machining time, after often completing one-pass, the screw thread damaged need be avoided, to the screw thread of three parts in upper, middle and lower of institute's chasing, detain the central diameter of screw thread respectively in the position measurement 1 of 0 ~ 180 degree, 45 ~ 225 degree, 90 ~ 270 degree and 135 ~ 315 degree; After machining completes, double thread carries out one or more inspections that visual examination, go-no go gauge inspection and central diameter are measured.
9. the main screw restorative procedure of reactor pressure vessel according to claim 1, is characterized in that: described step 4) machining time, after every feed twice, need shaping blades be changed and check that blade end is jumped, requiring that end jumping is less than 0.04mm; Adopt air cooling to add oil cooling during trial cut, during normal cutting, adopt emulsion cooling.
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| CN105817831B (en) * | 2016-05-13 | 2018-07-10 | 中广核研究院有限公司 | The screw hole defects detection and restorative procedure of nuclear power station large container and equipment, device |
| 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 |
| CN105904042A (en) * | 2016-06-30 | 2016-08-31 | 中广核研究院有限公司 | Internal thread local defect milling mechanism |
| 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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