CN205852360U - Large thin-wall turbine fixture for processing device - Google Patents
Large thin-wall turbine fixture for processing device Download PDFInfo
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- CN205852360U CN205852360U CN201620869078.1U CN201620869078U CN205852360U CN 205852360 U CN205852360 U CN 205852360U CN 201620869078 U CN201620869078 U CN 201620869078U CN 205852360 U CN205852360 U CN 205852360U
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- impeller
- recess
- base plate
- compressing member
- processing device
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Abstract
The utility model discloses large thin-wall turbine fixture for processing device, grip device includes base plate, base plate work surface is provided with the first recess and the second recess, first recess coordinates with impeller end the first disc, second recess coordinates with impeller end the second disc, the edge of the first recess is provided with the first compressing member for compressing impeller wall, the center of the second recess is detachably provided with the second compressing member for impeller end the second disc lock onto base plate, impeller end the first disc is positioned by this utility model by arranging the first recess, and by the first compressing member, impeller is lock onto base plate, without welding, convenient fixing is quick, after the machining that impeller is carried out the first round;Arrange the second recess again impeller the second disc is positioned, and fastened by the second compressing member, it is achieved a point ordered pair impeller is machined out, it is to avoid unprocessed situation occurs because of fixture or other reasons to some face, improves impeller surface precision.
Description
Technical field
This utility model relates to Impeller Machining field, more particularly to large thin-wall turbine fixture for processing device.
Background technology
Centrifugal compressor or centrifugal pump are used for providing pressurization for the flowing of various fluids.This compressor or centrifugal pump comprise
Impeller, when the impeller is rotated, fluid axial direction enters, and then accelerates into circumference and radial direction, and high flow rate fluid enters
Diffuser, exports high-pressure fluid after converted speed, to this type of compressor or centrifugal pump, the impeller used is generally alloy essence
Close casting large-scale thin-walled impeller.Which kind of, regardless of to impeller, need to be machined out impeller such as car after casting or manufacture
Just can come into operation after processing, heat treatment, high-speed test (HST), also be such to large thin-wall impeller, but in prior art not
, if using existing fixture to carry out clamping, there is following a few side in the jig for machining arranged for large thin-wall impeller
The problem in face:
1) relatively thin due to the wall ratio of impeller, in particular for large thin-wall double shrouded wheel, thinnest part is less than 1.2mm, directly
Clamping easily causes deformation and ruptures, and impeller is caused damage, the difficulty that has been follow-up Vehicle Processing band the most further, and
After in most cases damaging impeller, impeller will be scrapped, and considerably increases production cost;
2) complex because of clamping tool, face more on impeller is not machined into, and reduces Vehicle Processing largely
Precision;
3) impeller is directly arranged on impeller support base plate, does not carry out impeller an effective location, easily sending out
Raw radial deflection, so easily makes impeller surface crack because of vibrations during Vehicle Processing, concurrently there are bigger peace
Full hidden danger, reduces machining accuracy further;
4) fixture for processing can not play quick positioning action, therefore wastes more clamping alignment time.
5) on the impeller vanes welding clamp ring or when casting impeller adding technology annulus, follow-up polishing or repair type increase
Add machining period, and be unfavorable for that unfamiliar workman operates.
6) impeller is cast member, and integral surface poor flatness positions inaccurate, and fixing centering efficiency is low, adds during Vehicle Processing
Work precision reduces, and easily makes workpiece deform, and yield rate is low.
Accordingly, it would be desirable to turbine clamp for machining is researched and analysed further.
Utility model content
In order to overcome above-mentioned deficiency of the prior art, this utility model provides a kind of large thin-wall turbine processing and uses
Grip device, by arranging two or more recesses, it is achieved stably fix impeller, fast and easy finds location, energy accurately
Make impeller stress equalization, it is to avoid impeller is caused damage, be effectively increased turbine working (machining) efficiency.
Additionally provide a kind of large thin-wall turbine fixture for processing device, by arranging a recess, the first compressing member
With the second compressing member, conveniently impeller is stably fixed, can quickly realize the location to impeller, quickly determine impeller benchmark
Face, improves working (machining) efficiency.
In order to reach above-mentioned purpose, this utility model adopts the following technical scheme that
The scheme that this utility model provides is: large thin-wall turbine fixture for processing device, including base plate, base plate
Work surface is provided with the first recess and the second recess, and when impeller is horizontally disposed with, great circle face, impeller end is impeller end the first circle
Face, roundlet face, impeller end is impeller end the second disc, and the first recess coordinates with impeller end the first disc, the second recess with
Impeller end the second disc coordinates, and the edge of the first recess is provided with the first compressing member for compressing impeller wall, the second recess
Center is provided with dismountable the second compressing member for impeller end the second disc lock onto base plate, such first recess and leaf
Wheel end the first disc coordinates, and plays a quick positioning action, effectively prevents impeller from sliding simultaneously and radial deflection occurs, and first
Impeller is lock onto base plate by compressing member, and when impeller is double shrouded wheel, impeller under impeller can be carried out compressing i.e. by the first compressing member
Realize the whole compression to impeller;After impeller overturns, the second recess coordinates with impeller end the second disc, plays equally quickly
Positioning action, is fixed by the second compressing member.
Wherein, when great circle face, impeller end under, roundlet face, impeller end is when upper, and the impeller of top is upper impeller, under
The impeller of side is lower impeller.
Further, also including the i-th recess being located at base plate work surface, i is more than or equal to 3, removes the first recess and the
After two recesses, it is also possible to arrange recesses many again, for realizing the location to multiple different size impeller end faces, improve base plate and make
Versatility.
Preferably, with one heart or eccentric setting, or the two is set up in parallel, for saving for described first recess and described second recess
Space, the preferably first recess and the second recess are arranged concentrically, when there being the 3rd recess, the stepped setting of multiple recesses.
The shape of recess is the most identical with the shape of impeller end face, or can be zigzag fashion around recess, both side
Just location quick to impeller, convenient again takes out impeller, because of the end face one of impeller big one little, therefore, the first recess is big fixed
Circle of position, the second recess is little setting circle.
Further, for fast aligning, grip device also include being located at described first recess edge for positioning leaf
The keeper of wheel position, keeper and the respective maximum height of the first compressing member are less than the height of impeller on impeller so that location
Part is between upper impeller and lower impeller, and when arranging impeller, locating piece is located between adjacent two blades, with impeller under impeller
Inner surface contact ensures the determination of datum level, makes adjustment block contact with impeller under impeller by adjusting the height of adjustment block;Equally
Ground, compressing member is located between adjacent two blades equally, compresses lower impeller above lower impeller.
Described first compressing member is respectively equipped with multiple with described keeper, and the two is symmetrical arranged, multiple first compressing members with
The edge of described first recess is uniformly located at keeper interval, and such setting can guarantee that the stress balance of impeller, arranges symmetry,
Avoid thin-walled impeller is caused damage.
Further, described first compressing member and described keeper are each provided with the first perforate, and securing member is opened through first
First compressing member and keeper are rotatably disposed in the work surface of described base plate by hole, because the first recess size is more than impeller end
First disc, when fastening, the first perforate selecting compressing member is slotted hole, the convenient adjustment to compressing member position.
Further, in order to ensure the equilibrium of stress, the first compressing member being additionally provided with the second perforate, securing member passes through second
First compressing member is anchored on base plate by perforate, plays further fastening effect.
During Vehicle Processing, in order to quickly impeller be positioned, shorten the clamping time, described in base plate work surface
Being provided with adjustment block groove between first recess and described second recess, arrange adjustment block in adjustment block groove, the bottom of adjustment block groove is opened
Having the 3rd perforate, securing member is used for adjusting the height of adjustment block, described adjustment block and the first compressing member or fixed through the 3rd perforate
Position part is correspondingly arranged the most up and down, it is also possible to non-one_to_one corresponding, when the first compressing member or keeper are in closed position, both along
The diameter of impeller is arranged.
Additionally, described second compressing member includes that securing member is worn for covering the clam member at impeller central shaft bore surface
Cross clam member, impeller central axis hole fastens with base plate, and when impeller is positioned in little setting circle, clamp device is through fastening pressure
Plate, impeller central fasten with base plate;Described clamp device is preferably hold-down bolt, it is also possible to be steel bolt, and the upper and lower two ends of steel bolt lead to
Crossing nut to fasten respectively, because of the setting of central shaft hole, described clam member lower surface is provided with the step for coordinating with impeller, side
Just the location to clam member, additionally, for improving the stability fastened, securing member is triangularly arranged.
Above scheme passes through the first recess, the setting of the second recess, it is achieved initial alignment to impeller in machining process,
Quick and convenient, facilitate centering by keeper, shorten alignment time, by the first compressing member and the second compressing member respectively to impeller
Compress, effectively prevent the damage to thin-walled impeller.
The scheme that this utility model provides can be not only used for the Vehicle Processing to impeller, it is also possible to for other of impeller
Machining, as plane, milling, riveting etc. are processed.
Second scheme that this utility model provides is: large thin-wall turbine fixture for processing device, including base plate, the end
Plate work surface is provided with a recess, and recess coordinates with place, great circle face, impeller end work surface, and the edge of recess is provided with for by leaf
Wheel end the first disc lock onto the first compressing member of base plate, is detachably provided with for by impeller end on base plate work surface
Two discs lock onto the second compressing member of base plate and are provided with the second compressing member.
The program eliminates the second recess in the first string, can meet equally and position the quick of impeller, now, the
In two compressing members, the best multiple bolts of clam member fasten, and multiple bolts are arranged in the way of Atria summit, or
Person is fastened with the bolt of circular manner layout by four, it is simple to improve stability.
Use first scheme finish turning processing method, specifically comprise the following steps that
1) great circle face, impeller end is positioned in the first recess of base plate work surface;
2) rotary setting the first compressing member on base plate is to closed position, compresses impeller under impeller and passes through fastening
Part is locked;
3) use lathe machining device that inner circle, curved surface and the end face of impeller carry out accurate machining;
4) step 3) complete after, rotate the first compressing member to open position, impeller unloaded and spins upside down, by impeller end
Little disc is positioned in the second recess;
5) compressed after impeller by the second compressing member, to step 4) in unprocessed impeller face carry out Precision Machining
Wherein, in described step 1) need before impeller is cleared up burr, need impeller after setting impeller
Adjusting levelness, specifically method of adjustment is: arrange adjustment block groove in impeller baseplate, arranges adjustment block in adjustment block groove, adjusts
The bottom of monoblock groove has the 3rd perforate, and securing member is used for adjusting the height of adjustment block through the 3rd perforate, and in step 1)
Need adjustment block groove is cleaned out, it is to avoid falling into of impurity before, and affect finish turning processing.
Described step 5) in compress impeller method be: clam member is set at impeller top, is connected by hold-down bolt
Clam member and base plate.
In described step 2) carry out before, rotate the standard setting block be located on base plate to closed position, and adjust and be located at the end
Adjustment block in plate, it is ensured that adjustment block contacts with impeller.
The beneficial effects of the utility model are:
1) impeller end the first disc is positioned by arranging the first recess, and by the first compressing member by impeller lock
Tight in base plate, it is not necessary to welding, convenient fixing is quick, after the machining that impeller carries out the first round;Second recess pair is set again
Impeller the second disc positions, and is fastened by the second compressing member, it is achieved a point ordered pair impeller is machined out, it is to avoid right
Because of fixture or other reasons, unprocessed situation occurs in some face, improves impeller surface precision.
2) by arranging multiple first compressing member and keeper, from all directions impeller compressed or position, both
Ensure that and mach effectively carry out, improve the safety coefficient of operation element, simultaneously, it is to avoid the damage to thin-walled impeller.
3) being contacted with impeller by adjustment adjustment block, cooperation keeper connects with datum level (impeller inner surface under impeller)
Touch, improve alignment quality, prevent impeller generation fixed deformation.
4) it is not higher than the height of impeller on impeller by the rational height of keeper and the first compressing member, it is achieved leaf on impeller
Plate and the location of inferior lobe board space Leaf, and the compression of lower impeller in space, it is to avoid directly destroying impeller outer surface.
5) by the use of impeller grip device, working (machining) efficiency improves 150%, and yield rate improves 100%.
Accompanying drawing explanation
Fig. 1 is schematic diagram time in impeller snaps in big setting circle in this utility model;
Fig. 2 is schematic diagram time in impeller snaps in little setting circle in this utility model;
Fig. 3 is the top view of grip device in this utility model;
Fig. 4 is the top view of compact heap in this utility model;
Fig. 5 is the sectional view of compact heap in this utility model;
Fig. 6 is the sectional view of locating piece in this utility model;
Wherein, 1. locating piece, 2. hold-down bolt A, 3. adjustment block, 4. adjust bolt, the least setting circle, 6. impeller, the 7. end
Plate, 8. compact heap, 9. compression carrying bolt, 10. hold-down bolt B, 11. hold-down bolt C, 12. clam members, 13. big setting circles,
14. adjustment block grooves, 15. open positions, 16. closed position.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clear, complete description.
Embodiment 1
Large thin-wall turbine fixture for processing device, including base plate 7, base plate 7 upper surface be provided with multiple two for
Block the first recess and second recess of impeller end face, because of the end face one of impeller 6 big one little, therefore the first recess and second
Big setting circle 13 in recess i.e. Fig. 1 and little setting circle 5, be movably equipped with at multiple compact heaps 8 as first at base plate 7 work surface
Compressing member and multiple locating piece 1 are as keeper, and locating piece is accomplished that the location to Impeller Machining benchmark, and machining benchmark is leaf
The lower impeller inner surface of wheel, so can realize quickly positioning, and compact heap 8 is rotatably affixed on base plate 7, little setting circle 5 and impeller
When end the second disc coordinates, using the second compressing member to fasten, the second compressing member includes for covering at impeller middle spindle
The clam member 12 of hole surface, securing member fastens through clam member 12, impeller 6 center with base plate 7, the shape of clam member 12
Can be circular, it is also possible to being polygon, polygon-shaped clam member 12 is easy to take.
It is fixing that being disposed to of two setting circles preferably quickly realizes impeller 6, the shape of setting circle preferably with
The shape of impeller 6 end face is identical, or is zigzag fashion around depressed area, has both facilitated and has quickly positioned impeller 6, has the most conveniently taken
Go out impeller 6.
In order to, in machining process, quickly impeller 6 be positioned, shorten the clamping time, have at base plate 7 upper surface
8 adjustment block grooves 14, arrange adjustment block 3 in adjustment block groove 14, and for avoiding the destruction to impeller, the material of adjustment block 3 is aluminum
Or other soft metals, the accuracy ensureing location is contacted by 6 times impeller of adjustment block 3 and impeller, base plate 7 is provided with and adjustment block
3rd perforate of groove 14 connection, is adjusted bolt 4 and is adjusted the height of adjustment block 3 by the 3rd perforate, to facilitate impeller levelness
Adjustment, the 3rd perforate can vertically open in base plate 7, and wherein, the adjustment block coordinated with compact heap is applied not only to location, simultaneously with
Compact heap coordinates plays a supporting role, and effectively prevents the generation that impeller deforms during Vehicle Processing.
Securing member is preferably hold-down bolt B10, as it is shown in figure 1, set for the hold-down bolt perforate through hold-down bolt B10
In the middle part of compact heap 8, being provided with compression carrying bolt 9 at compact heap 8 away from the end of impeller 6, securing member can also be steel bolt,
Two ends are fastened respectively by nut up and down.
Described compact heap 8 compresses carrying bolt 9 by hold-down bolt and is rotatably affixed on base plate 7, and locating piece 1 is by pressure
Tight bolt A2 is rotatably affixed on base plate 7, and compact heap 8 is provided with hold-down bolt perforate, and hold-down bolt B10 passes perforate and the end
Plate 7 is fixed, and when the grip device free time, compact heap 8 and positioning datum block 1 are in open position 15, will not interfere with putting of impeller 6
Putting, after placing impeller 6, impeller 6 is fastened by compact heap 8 and locating piece 1, because of multiple compact heaps 8 with locating piece 1 end of at
It is uniformly arranged on impeller 6 on plate 7 around, symmetry is set, as it is shown on figure 3, thin-walled impeller will not be caused damage;It is embodied as
During, preferably compact heap 8 and locating piece 1 are all set to elongate in shape, it is simple to operate and rotate;And one end of compact heap 8 is
Good size gradually tapers up, it is simple on straight line, compact heap 8 aligns with locating piece 1, and compact heap 8 is for compressing the end of impeller
Thicker than the other end thickness, as shown in figures 4-6.
Use said apparatus to impeller finish turning processing method, specifically comprise the following steps that
1, base plate 7 is fixed on the workbench of lathe also centering;
2, clean out in adjustment block groove 14, adjustment block 3 is placed in adjustment block groove 14, locating piece 1 and compact heap 8
Adjust in open position;
3, impeller 6 bottom surface deburred is clean, the big circular bottom surface of impeller 6 after rough turn is placed in big setting circle 13;
4, locating piece 1 is adjusted to closed position 16, screws the adjustment bolt 4 of correspondence then up, make everywhere adjustment block 3
All contact with impeller under impeller, and make locating piece be in close contact with impeller datum level;
5, compact heap 8 is adjusted to closed position, screws the adjustment bolt 4 of correspondence then up, make everywhere adjustment block 3 all
Contact with impeller, then impeller wall is fixed to clamp by compact heap 8, as shown in Figure 1;
6, after location centering completes, inner circle, curved surface and the end face of impeller 6 is carried out accurate machining;
7, after machining, impeller 6 is unloaded, spins upside down impeller, little for impeller disc is placed in little setting circle 5;
8, clam member 12 is connected impeller 6 and base plate 7 by hold-down bolt C11, as shown in Figure 2;
9, after location centering completes, unprocessed face in impeller 6 step 6 is carried out accurate Vehicle Processing.
After above-mentioned process finishing, the polish of whole impeller 6 terminates.
By above step, simplifying the step of impeller finish turning processing, working (machining) efficiency improves 150%, and be difficult to right
Impeller causes damage, yield rate to bring up to 100%, and effect is preferable.
Embodiment 2
Large thin-wall turbine fixture for processing device, including base plate, base plate work surface is provided with a recess, recess and impeller
Big disc place, end work surface coordinates, and the edge of recess is provided with for impeller end the first disc is lock onto the first of base plate
Compressing member, is detachably provided with on base plate work surface and sets for the second compressing member that impeller end the second disc lock onto base plate
There is the second compressing member.
The program eliminates the second recess in the first string, can meet equally and position the quick of impeller, now, the
The bolt that in two compressing members, clam member is arranged preferably by triangle fastens, it is simple to improve stability.
In the present embodiment, other structures are identical with the structure in embodiment 1.
The above is only preferred implementation of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of without departing from this utility model principle, it is also possible to make some improvements and modifications, these improve and
Retouching also should be regarded as protection domain of the present utility model.
Claims (10)
1. large thin-wall turbine fixture for processing device, it is characterised in that include that base plate, base plate work surface are provided with the first recess
With the second recess, the first recess coordinates with impeller end the first disc, and the second recess coordinates with impeller end the second disc, and first
The edge of recess is provided with the first compressing member for compressing impeller wall, and the center of the second recess is detachably provided with for by impeller end
Portion's the second disc lock onto the second compressing member of base plate.
2. large thin-wall turbine fixture for processing device as claimed in claim 1, it is characterised in that also include being located at base plate
The i-th recess of work surface, i is more than or equal to 3, described first recess and described second recess with one heart or eccentric setting, or the two
It is set up in parallel.
3. large thin-wall turbine fixture for processing device as claimed in claim 1, it is characterised in that also include being located at described
The keeper for positioning impeller location at the first recess edge, keeper and the respective maximum height of the first compressing member are less than leaf
The height of impeller on wheel.
4. large thin-wall turbine fixture for processing device as claimed in claim 3, it is characterised in that described first compressing member
Being respectively equipped with multiple with described keeper, the two is symmetrical arranged, and multiple first compressing members and keeper interval are uniformly located at described
The edge of the first recess.
5. the large thin-wall turbine fixture for processing device as described in claim 3 or 4, it is characterised in that described first pressure
Tight part is each provided with the first perforate with described keeper, and securing member is rotatable with keeper by the first compressing member through the first perforate
Being arranged at the work surface of described base plate, the first perforate of the first compressing member is slotted hole.
6. large thin-wall turbine fixture for processing device as claimed in claim 5, it is characterised in that on the first compressing member also
Being provided with the second perforate, the first compressing member is anchored on base plate by the second perforate by securing member.
7. the large thin-wall turbine fixture for processing device as described in claim 3 or 4, it is characterised in that work at base plate
It is provided with adjustment block groove between described first recess and described second recess in face, adjustment block, adjustment block groove are set in adjustment block groove
Bottom have the 3rd perforate, securing member through the 3rd perforate for adjusting the height of adjustment block, described adjustment block and the first pressure
Tight part or keeper are correspondingly arranged the most up and down.
8. the large thin-wall turbine fixture for processing device as described in claim 1 or 2 or 3 or 6, it is characterised in that described
Second compressing member includes that securing member passes in clam member, impeller for covering the clam member at impeller central shaft bore surface
Arbor hole fastens with base plate, and described clam member lower surface is provided with the step for coordinating with impeller.
9. large thin-wall turbine fixture for processing device, it is characterised in that include that base plate, base plate work surface are provided with a recess,
Recess coordinates with place, great circle face, impeller end work surface, and the edge of recess is provided with for being lock onto by impeller end the first disc
First compressing member of base plate, base plate work surface is detachably provided with for impeller end the second disc is lock onto base plate
Two compressing members are provided with the second compressing member.
10. large thin-wall turbine fixture for processing device as claimed in claim 9, it is characterised in that also include being located at institute
State the keeper for positioning impeller location at the first recess edge, keeper and the respective maximum height of the first compressing member to be less than
The height of impeller on impeller.
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CN201620869078.1U CN205852360U (en) | 2016-08-11 | 2016-08-11 | Large thin-wall turbine fixture for processing device |
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CN201620869078.1U CN205852360U (en) | 2016-08-11 | 2016-08-11 | Large thin-wall turbine fixture for processing device |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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CN106041589A (en) * | 2016-08-11 | 2016-10-26 | 山东豪迈机械科技股份有限公司 | Clamp device for machining large-sized thin-walled impeller and finish machining method of large-sized thin-walled impeller |
CN107825156A (en) * | 2017-11-01 | 2018-03-23 | 贵州凯阳航空发动机有限公司 | A kind of aero-engine low-pressure turbine director assembly processing unit (plant) |
CN108673024A (en) * | 2018-07-13 | 2018-10-19 | 北京无线电计量测试研究所 | A kind of cavity components welding clamp device |
CN109807651A (en) * | 2018-12-11 | 2019-05-28 | 中国航发贵州黎阳航空动力有限公司 | A kind of distortion-free fixture of thin wall special-shaped comb tooth part |
CN110280782A (en) * | 2019-06-20 | 2019-09-27 | 中国航发贵州黎阳航空动力有限公司 | The processing method of thin-walled parts |
CN111660118A (en) * | 2020-06-12 | 2020-09-15 | 中航力源液压股份有限公司 | Multipurpose milling clamp |
CN113953864A (en) * | 2021-11-15 | 2022-01-21 | 福洛德(上海)传动技术有限公司 | Tool for machining thin-wall conical surface of ring disc part |
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2016
- 2016-08-11 CN CN201620869078.1U patent/CN205852360U/en active Active
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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CN106041589A (en) * | 2016-08-11 | 2016-10-26 | 山东豪迈机械科技股份有限公司 | Clamp device for machining large-sized thin-walled impeller and finish machining method of large-sized thin-walled impeller |
CN107825156A (en) * | 2017-11-01 | 2018-03-23 | 贵州凯阳航空发动机有限公司 | A kind of aero-engine low-pressure turbine director assembly processing unit (plant) |
CN108673024A (en) * | 2018-07-13 | 2018-10-19 | 北京无线电计量测试研究所 | A kind of cavity components welding clamp device |
CN109807651A (en) * | 2018-12-11 | 2019-05-28 | 中国航发贵州黎阳航空动力有限公司 | A kind of distortion-free fixture of thin wall special-shaped comb tooth part |
CN110280782A (en) * | 2019-06-20 | 2019-09-27 | 中国航发贵州黎阳航空动力有限公司 | The processing method of thin-walled parts |
CN111660118A (en) * | 2020-06-12 | 2020-09-15 | 中航力源液压股份有限公司 | Multipurpose milling clamp |
CN113953864A (en) * | 2021-11-15 | 2022-01-21 | 福洛德(上海)传动技术有限公司 | Tool for machining thin-wall conical surface of ring disc part |
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