CN207289054U - Spindle back taper hole machined back taper reamer cutter - Google Patents
Spindle back taper hole machined back taper reamer cutter Download PDFInfo
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- CN207289054U CN207289054U CN201721341381.5U CN201721341381U CN207289054U CN 207289054 U CN207289054 U CN 207289054U CN 201721341381 U CN201721341381 U CN 201721341381U CN 207289054 U CN207289054 U CN 207289054U
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Abstract
It the utility model is related to spindle back taper hole machined back taper reamer cutter, it is characterised in that：The back taper reamer cutter includes back taper reamer and special quick change handle of a knife, and the back taper reamer includes knife bar, the cutter hub for being made and being fixed on knife bar tail end of high-speed steel and the cemented carbide body for being set in cutter hub cutting edge made of high-speed steel；The tail end of the special quick change handle of a knife extends outward a cylindrical shape assembling canister portion being coaxially distributed, and is additionally provided with the assembling canister portion for making knife bar head end self-locking centering ground detachable clearance be assemblied in the self-locking centering component in assembling canister portion inner cavity.Back taper reamer cutter provided by the utility model, conveniently realizes the fast assembling-disassembling between back taper reamer and special quick change handle of a knife, helps to save the tool change time in knuckle reverse taper holes process, and back taper reamer manufacture cost is low.
Description
Technical field
Spindle reverse taper holes processing technique field is the utility model is related to, is specifically related to spindle reverse taper holes
Back taper reamer cutter is used in processing.
Background technology
Spindle is the important safety part in automobile steering system, its function is to transmit and bear automotive suspension system
System load, supporting simultaneously drive wheel hub around stub rotate and make motor turning, and affect Riding Stability of Automobile, security and
Steering sensitivity.
Ball pin hole takes reverse taper holes to design more under the passenger car knuckle such as SUV, has registration, connection reliable lock etc.
Advantage.So-called " reverse taper holes " refer to relative to tool feeding direction, and taper hole apertura lateralis is small, inner side face is big, therefore machine power can not
Realize taper reamer autofeed and withdrawing, difficulty of processing is big.General taper hole roughness requirements Ra1.6, the conical surface are examined using red lead
Look into contact area >=75%.
Following two modes are mainly used in conventional processes：Traditional back taper hole forming method one：Machining center（Or bore
Bed）Drilling → shutdown, manually loads onto back taper roughing reamer → machining center（Or drilling machine）Thick fraising → shutdown, it is thick manually to unload back taper
Reamer, manually loads onto back taper bottoming reamer → machining center（Or drilling machine）Hole → shutdown is finish reamed, manually unloads back taper bottoming reamer → cone
Hole quality inspection.This method fixture is simple, selects general back taper reamer, can both be realized in common driller, also can with processing
The heart（BT50 models）Main shaft knife handle matching processing.But shortcoming is：Manually handling reamer, labor strength is big, low production efficiency,
The high processing costs such as cutter, taper hole quality is unstable, and processing rejection rate is 1%~5%.
Traditional back taper hole forming method two：Using special taper hole boring lathe, realize that conic boring adds using movement composition principle
Work, realizes that cutter oblique movement and rotary cutting move with double-deck main axle structure, is rotated by motor gear and drive boring cutter to revolve
Transhipment is dynamic；Special boring cutter bar coordinates with boring template to be assembled, and promotes boring cutter bar to do diagonal movement along boring template by hydraulic jack push rod, real
Existing cone hole machine；After the completion of cone hole machine, feed cylinder counter motion is, it can be achieved that automatic withdrawal；By adjusting boring template angle and
Boring cutter direction, it can be achieved that just, reverse taper holes or straight hole processing, taper hole angle stabilization is high suitable for taper hole surface finish requirements
Commercial car knuckle Product processing.But：The drilling of this scheme disperses with bore hole process, and multiple clamping, does not apply to machining center etc.
Numerically controlled automatic is processed, and taper hole positional precision is low；Bore surface precision is less than fraising precision；Separately limited by boring bar size, it is uncomfortable
With small-bore cone hole machine, it is clear that cannot meet the requirement of the passenger car knuckle such as SUV technical standard；Need to put into Special borer at the same time
Bed, processing cost increase.
The overall back taper reamer used in spindle conventional machining process is all made of to use hard alloy material, system
Make of high cost, and the dismounting between back taper reamer and machining center main shaft is more time-consuming, have impact on processing efficiency indirectly.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of convenient and machining center main shaft fast assembling-disassembling, manufacture
Cost low spindle back taper hole machined back taper reamer cutter.
In order to solve the above technical problems, the utility model provides following technical scheme：Spindle back taper hole machined is used
Back taper reamer cutter, the back taper reamer cutter include back taper reamer and special quick change handle of a knife, and the back taper reamer includes by height
Knife bar, the cutter hub for being made and being fixed on knife bar tail end of high-speed steel and the hard conjunction for being set in cutter hub cutting edge made of fast steel
Jin Ti；The tail end of the special quick change handle of a knife extends outward a cylindric assembling canister portion being coaxially distributed, in the assembling canister portion
It is additionally provided with for making knife bar head end self-locking centering ground detachable clearance be assemblied in the self-locking centering component in assembling canister portion inner cavity.
On the basis of such scheme, a circular arc groove is offered on the circumferencial direction of the knife bar head end, it is described from locking
Heart component includes an elastomeric sleeve, a resetting spring and three and the corresponding ball of arc groove of knife bar, the assembling
Canister portion, which corresponds to, is uniformly provided with three mounting holes through assembling canister portion outboard sidewalls on the circumferencial direction at knife bar arc groove location,
Each mounting hole is placed with a ball, and ball can move in mounting hole along inward-outward direction；Socket outside the assembling canister portion
Have one can the elastomeric sleeve that slides of linear reciprocation, the tail end of the elastomeric sleeve madial wall is inwardly embedded with an annular solution indent,
The outer cover of the assembling canister portion head end is equipped with a resetting spring and the both ends of the resetting spring are respectively fixedly connected with elastic sliding
Set and special quick change handle of a knife tail end；
When resetting spring descends in the raw, the madial wall of elastomeric sleeve covers mounting hole and extrudes ball to installation
Hole medial movement so that ball engagement in knife bar arc groove, traversing elastomeric sleeve compression reseting spring connects to indent and mounting hole is solved
When logical, ball moves into solution indent laterally along mounting hole.
On the basis of such scheme, the longitudinal section of the mounting hole is isosceles trapezoidal structure wide outside and narrow inside, the installation
The outer openings width that hole corresponds to assembling canister portion lateral wall is wide more than the interior side opening of ball diameter, corresponding assembling canister portion madial wall
Degree is less than ball diameter, and the depth of mounting hole is less than ball diameter.
On the basis of such scheme, correspondence limitation elastomeric sleeve is threaded with the assembling canister portion tail end lateral wall
The stop nut of tail end.
On the basis of such scheme, the tail end of the special quick change handle of a knife is inwardly embedded with one and is coaxially distributed with assembling canister portion
Location hole, the knife bar head end extends outward a positioning bar portion corresponding with location hole, the knife bar head end clearance fit
When assembling in canister portion inner cavity, positioning bar portion coordinates in insertion location hole.
On the basis of such scheme, one is fixed with the location hole by pressing spring, when knife bar head end clearance fit is filling
During with canister portion inner cavity, the compression of positioning bar portion is by pressing spring and coordinates in insertion location hole.
The utility model has an advantageous effect in that compared with prior art：Special quick change handle of a knife provided by the utility model
Installation is coupled using Morse's taper with machining center main shaft, not only can guarantee that concentricity, but also convenient handling；Special quick change handle of a knife is with falling
Taper reamer takes small―gap suture to coordinate, and realizes that the self-locking of knife bar is felt relieved using cooperations of three balls and arc groove, ensure reamer and
Machining center main shaft concentricity；Extruding of the traversing elastomeric sleeve position realization to ball or releasing extruding, Jin Erbian are utilized at the same time
Fast assembling-disassembling between completion knife bar and special quick change handle of a knife.Moreover, back taper reamer provided by the utility model, its main body are adopted
With carbide inserts body at common high speed steel material, cutter hub cutting edge, its processing quality and the overall hinge for using hard alloy of tradition
Knife is suitable, but the cost of charp tool lower than conventional reamers more than 60%, and manufacture cost is low.
Brief description of the drawings
Fig. 1 is the positive angle schematic diagram of the utility model clamp for machining and machining center main shaft matching relationship；
Fig. 2 is the side view angle schematic diagram of the utility model clamp for machining and machining center main shaft matching relationship；
Fig. 3 is the utility model machining center main shaft, special quick change handle of a knife, the assembling relationship figure of back taper reamer three；
Fig. 4 is the partial sectional view of the special quick change handle of a knife of the utility model；
Fig. 5 is the structure diagram of the utility model back taper reamer.
Figure label is：1- machining center main shafts, 2- knuckle workpiece, 3- clamp for machining, 31- angle boards, 32- locating cores
Set, 33- rhombus pins, 34- hydraulic support cylinders, 35- hydraulic compression cylinders, 36- rotatably compress cylinder, 361- compact heaps, 4- back taper reamers
Cutter, 41- back taper reamers, 411- knife bars, 412- cutter hubs, 413- cemented carbide bodies, 414- arc grooves, 415- positioning bar portions, 42- are special
With quick change handle of a knife, 421- assembling canister portions, 422- mounting holes, 423- balls, 424- elastomeric sleeves, 425- resetting springs, 426- limits
Position nut, 427- solution indents, 428- location holes, 429- press pressing spring.
Embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, is further elaborated the utility model.It should be appreciated that specific embodiment described herein is only explaining
The utility model, is not used to limit the utility model.
In the description of the utility model, it is to be understood that term " longitudinal direction ", " transverse direction ", " on ", " under ", " preceding ",
The orientation or position relationship of the instruction such as " rear ", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " be based on
Orientation shown in the drawings or position relationship, are for only for ease of description the utility model, rather than instruction or the dress for implying meaning
Put or element there must be specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to the utility model
Limitation.
Referring to figs. 1 to Fig. 5, spindle back taper hole machined back taper reamer cutter 4, including back taper reamer 41 and special
Quick change handle of a knife 42.
Wherein, back taper reamer 41 includes the knife bar 411 made of high-speed steel, is made of high-speed steel and is fixed on knife bar
Cutter hub 412 on 411 tail ends and the cemented carbide body 413 being set at 412 cutting edge of cutter hub.Back taper hinge provided by the utility model
Knife 41, its main body is using carbide inserts body at common high speed steel material, cutter hub cutting edge, its processing quality and the overall use of tradition
The reamer of hard alloy is suitable, but the cost of charp tool lower than conventional reamers more than 60%, and manufacture cost is low.Meanwhile the knife bar 411
A circular arc groove 414 is offered on the circumferencial direction of head end, 411 head end of knife bar extends outward a positioning rod portion 415.
Wherein, the tail end of the special quick change handle of a knife 42 extends outward a cylindric assembling canister portion 421 being coaxially distributed,
The tail end of the special quick change handle of a knife 42 is inwardly embedded with a location hole 428 being coaxially distributed with assembling canister portion 421, location hole
One is fixed with 428 by pressing spring 429, when 411 head end clearance fit of knife bar is being assembled in 421 inner cavity of canister portion, locating rod 415
Portion's compression is by pressing spring 429 and coordinates in insertion location hole 428.It is additionally provided with the assembling canister portion 421 for making knife bar 411 first
Self-locking centering ground detachable clearance in end is assemblied in the self-locking centering component in 421 inner cavity of assembling canister portion.
Self-locking centering component includes 424, resetting springs 425 of an elastomeric sleeve and three and knife bar 411
The corresponding ball 423 of arc groove 414.The assembling canister portion 421 corresponds to uniformly to be opened on the circumferencial direction at 414 position of knife bar arc groove
Equipped with three 120 ° of angles between the mounting hole 422 for assembling canister portion outboard sidewalls, adjacent mounting hole 422, each mounting hole 422
A ball 423 is placed with, ball 423 can move in mounting hole 422 along inward-outward direction.Particularly, the mounting hole
422 longitudinal section is isosceles trapezoidal structure wide outside and narrow inside, and the mounting hole 422 corresponds to the outer openings of assembling canister portion lateral wall
Width is more than ball diameter, the inner side opening width of corresponding assembling canister portion madial wall is less than ball diameter, and the depth of mounting hole 422
Degree is less than 423 diameter of ball.It is described assembling canister portion 421 outside be socketed with one can linear reciprocation slide elastomeric sleeve 424, it is described
The tail end of 424 madial wall of elastomeric sleeve is inwardly embedded with an annular solution indent 427, the outer cover of assembling 421 head end of canister portion
Both ends equipped with a resetting spring 425 and the resetting spring 425 are respectively fixedly connected with elastomeric sleeve 424 and special quick change handle of a knife
42 tail ends, it is described to assemble the spacing spiral shell that correspondence limitation 424 tail end of elastomeric sleeve is threaded with 421 tail end lateral wall of canister portion
Mother 426.
When resetting spring 425 descends in the raw, the madial wall of elastomeric sleeve 424 covers mounting hole 422 and squeezes
Nip drum pearl 423 is to mounting hole medial movement so that ball 423 coordinates in 411 arc groove 414 of knife bar；Traversing elastomeric sleeve 424 is pressed
When contracting resetting spring 425 to solution indent 427 is connected with mounting hole 422, ball 423 moves into decompression laterally along mounting hole 422
Groove 427 is interior and releases the cooperation with knife bar arc groove 414.Special quick change handle of a knife 42 is joined with machining center main shaft 1 using Morse's taper
Installation is connect, not only can guarantee that concentricity, but also convenient handling；Special quick change handle of a knife 42 takes small―gap suture to coordinate with back taper reamer 41（H8/
f7）, and realize that the self-locking of knife bar 411 is felt relieved using the cooperation of three balls 423 and arc groove 414, ensure reamer and machining center
1 concentricity of main shaft；At the same time using extruding of traversing 424 position of the elastomeric sleeve realization to ball 423 or releasing extruding, and then it is easy to
Complete the fast assembling-disassembling between knife bar 411 and special quick change handle of a knife 42.
When needing back taper reamer 41 being assembled on special quick change handle of a knife 42, by elastomeric sleeve 424 to special Rapid replacing cutter
The head end direction movement of handle 42, releases covering of 424 madial wall of elastomeric sleeve to mounting hole 422, releases the inner side of elastomeric sleeve 424
Extruding of the wall to ball 423, makes the solution indent 427 of elastomeric sleeve 424 be connected with mounting hole 422, then inserts 411 head end of knife bar
Enter to assemble in 421 inner cavity of canister portion, positioning bar portion 415 is inserted into location hole 428, and three balls 423 are automatically locked at knife bar 411
In arc groove 414, realize that self-locking is felt relieved, then elastomeric sleeve 424 automatically resets under the effect of 425 restoring force of resetting spring and realizes it
Extruding of the madial wall to ball 423, ball 423 are fitted securely within knife bar arc groove 414, meanwhile, stop nut 426 can limit
The path increment of 424 rearward end of elastomeric sleeve movement processed., will when needing to pull down back taper reamer 41 from special quick change handle of a knife 42
Elastomeric sleeve 424 is moved to the head end direction of special quick change handle of a knife 42, releases 424 madial wall of elastomeric sleeve to mounting hole 422
Covering, release extruding of the elastomeric sleeve madial wall to ball 423, and the solution indent 427 and mounting hole 422 for making elastomeric sleeve 424 connect
Logical, then knife bar 411 is displaced outwardly, ball 423 is displaced outwardly along mounting hole 422, and knife bar 41 smoothly detaches assembling canister portion
421, realize the fast quick-detach of back taper reamer 41 and special quick change handle of a knife 42.
Understood referring to figs. 1 to Fig. 5, the processing side of spindle back taper hole machined is carried out using above-mentioned back taper reamer cutter
Method, including following technical step：
（1）A knuckle workpiece 2 is positioned respectively in the left and right sides of clamp for machining 3, and treats 2 times ball pins of knuckle workpiece
The taper hole position of processing and the perpendicular distribution in 1 position of machining center main shaft positioned at the top of clamp for machining 3；Then, back taper is cut with scissors
The special quick change handle of a knife 42 of knife cutter 4 is installed on machining center main shaft 1；
（2）Drill to the taper hole position to be processed of two knuckle workpiece 2 and rough mill out a back taper bottom outlet；
（3）Machining center main shaft 1 is moved into corresponding left side knuckle workpiece taper hole position to be processed, manually by back taper reamer
The back taper reamer 41 of cutter 4 passes through left side knuckle workpiece step（2）Special Rapid replacing cutter is installed on after the back taper bottom outlet rough milled out
On handle 42；Then, left side knuckle workpiece is finish reamed to form reverse taper holes using back taper reamer 41；Shut down, manually by back taper reamer
41 are rapidly separated with special quick change handle of a knife 42；
（4）Machining center main shaft 1 is moved into corresponding right hand steering section workpiece taper hole position to be processed, manually by back taper reamer
41 pass through right hand steering section workpiece step（2）It is installed on after the back taper bottom outlet rough milled out on special quick change handle of a knife 42；Then, utilize
Back taper reamer 41 finish reams to form reverse taper holes to right hand steering section workpiece；
（5）Shut down, be manually rapidly separated back taper reamer 41 and special quick change handle of a knife 42；Then, take out both sides two
Knuckle workpiece 2, carries out the examination and test of products.
The processing method that the technical program provides is suitable for the high standard automobile knuckle back taper hole machineds such as SUV, can also fit
For other class knuckle back taper hole machineds.And the taper hole roughness of converted products reaches Ra0.8~1.6, red lead inspection connects
Contacting surface product >=80%；Cone hole machine efficiency is more than 3 times of common process, and taper hole rejection rate is controlled within 0.1%, rejection rate
It is low, remarkable in economical benefits.
With further reference to Fig. 1 and Fig. 2, the clamp for machining 3 in above-mentioned processing method, includes the angle board of a tilt distribution
31st, the two positioning hydraulic support cylinder 34, two of core retainer plate 32, two hydraulic compression cylinders 35 corresponding with 2 axle journal of knuckle workpiece,
Two rotatably compress cylinder 36 with compact heap 361.Wherein, the angle of inclination of angle board 31 treats 2 times ball pins of knuckle workpiece
Process taper hole position and the 4 perpendicular distribution in position of back taper reamer cutter on machining center main shaft 1.
Wherein, two positioning core retainer plates 32 are respectively and fixedly installed to the both sides of angle board 31, and knuckle workpiece 2 passes through collar
Divide the centre bore of insertion respective side positioning core retainer plate 32 to realize to be fixed on positioning core retainer plate 32.It is further opened with and turns on angle board 31
The corresponding mounting hole in ABS holes of workpiece 2 is saved, ABS holes are fixedly connected with reality by knuckle workpiece 2 by rhombus pin 33 with mounting hole
Now it is fixed on angle board 31.A hydraulic support cylinder 34 and a hydraulic pressure are fixed in each 2 times ball pin both sides of knuckle workpiece respectively
Hold-down cylinder 35, each knuckle workpiece 2 are realized under the cooperation pressuring action of corresponding hydraulic support cylinder 34 and hydraulic compression cylinder 35
Position positions.Each knuckle workpiece 2 corresponds to one and rotatably compresses cylinder 36, and compact heap 361 is with the shape with 31 parallel distribution of angle board
State, which is located at the front of knuckle workpiece 2 and is realized in the case where rotatably compressing the driving effect of cylinder 36, compresses knuckle workpiece 2, rotation pressure
When tight cylinder 36 is shunk, compact heap 361 moves closer to knuckle workpiece 2 and realizes compression, when rotatably compressing the extension of cylinder 36, compact heap
361 are gradually distance from knuckle workpiece 2 and realize decompression.Using position core retainer plate 32 and 2 journal engagement of knuckle workpiece, ABS holes with
Rhombus pin 33, which coordinates, realizes that knuckle workpiece 2 positions while on angle board 31, ensures the positioning uniformity per procedure；And profit
Realize that the assisted extrusion positioning to knuckle workpiece 2 makes workpiece more with hydraulic support cylinder 34, hydraulic compression cylinder 35 and compact heap 361
Add firm, workpiece will not produce shake when ensure that cone hole machine, further ensure machining accuracy.
Claims (6)
1. spindle back taper hole machined back taper reamer cutter, it is characterised in that：The back taper reamer cutter is cut with scissors including back taper
Knife and special quick change handle of a knife, the back taper reamer include the knife bar made of high-speed steel, are made of high-speed steel and are fixed on knife
Cutter hub on bar tail end and the cemented carbide body being set at cutter hub cutting edge；The tail end of the special quick change handle of a knife extends outward
One cylindrical shape being coaxially distributed assembles canister portion, is additionally provided with the assembling canister portion for making knife bar head end self-locking centering ground detachably
Gap is assemblied in the self-locking centering component in assembling canister portion inner cavity.
2. spindle back taper hole machined according to claim 1 back taper reamer cutter, it is characterised in that：The knife
Offer a circular arc groove on the circumferencial direction of bar head end, the self-locking centering component include an elastomeric sleeve, one it is multiple
Position spring and three and the corresponding ball of arc groove of knife bar, the canister portion of assembling correspond to circumferencial direction at knife bar arc groove location
On be uniformly provided with three mounting holes through assembling canister portion outboard sidewalls, each mounting hole is placed with a ball, and ball can be
Moved in mounting hole along inward-outward direction；Be socketed with outside the assembling canister portion one can linear reciprocation slide elastomeric sleeve, institute
The tail end for stating elastomeric sleeve madial wall is inwardly embedded with an annular solution indent, and the outer cover of the assembling canister portion head end is equipped with one and answers
The both ends of position spring and the resetting spring are respectively fixedly connected with elastomeric sleeve and special quick change handle of a knife tail end；
When resetting spring descends in the raw, the madial wall of elastomeric sleeve covers mounting hole and extrudes ball into mounting hole
Side is mobile so that ball engagement is in knife bar arc groove, and traversing elastomeric sleeve compression reseting spring is connected to indent is solved with mounting hole
When, ball moves into solution indent laterally along mounting hole.
3. spindle back taper hole machined according to claim 2 back taper reamer cutter, it is characterised in that：The peace
The longitudinal section for filling hole is isosceles trapezoidal structure wide outside and narrow inside, and the outer openings that the mounting hole corresponds to assembling canister portion lateral wall are wide
Degree is less than ball diameter more than the inner side opening width of ball diameter, corresponding assembling canister portion madial wall, and the depth of mounting hole is small
In ball diameter.
4. spindle back taper hole machined according to claim 2 back taper reamer cutter, it is characterised in that：The dress
With the stop nut that correspondence limitation elastomeric sleeve tail end is threaded with canister portion tail end lateral wall.
5. spindle back taper hole machined according to claim 1 back taper reamer cutter, it is characterised in that：It is described special
A location hole being coaxially distributed with assembling canister portion is inwardly embedded with the tail end of quick change handle of a knife, the knife bar head end extends outward
One positioning bar portion corresponding with location hole, when assembling in canister portion inner cavity, positioning bar portion coordinates the knife bar head end clearance fit
It is inserted into location hole.
6. spindle back taper hole machined according to claim 5 back taper reamer cutter, it is characterised in that：It is described fixed
One is fixed with the hole of position by pressing spring, when knife bar head end clearance fit is being assembled in canister portion inner cavity, positioning bar portion compression pressing
Spring simultaneously coordinates in insertion location hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721341381.5U CN207289054U (en) | 2017-10-18 | 2017-10-18 | Spindle back taper hole machined back taper reamer cutter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721341381.5U CN207289054U (en) | 2017-10-18 | 2017-10-18 | Spindle back taper hole machined back taper reamer cutter |
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| Publication Number | Publication Date |
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| CN207289054U true CN207289054U (en) | 2018-05-01 |
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ID=62273157
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107639302A (en) * | 2017-10-18 | 2018-01-30 | 安徽安簧机械股份有限公司 | Spindle back taper hole machined back taper reamer cutter |
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2017
- 2017-10-18 CN CN201721341381.5U patent/CN207289054U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107639302A (en) * | 2017-10-18 | 2018-01-30 | 安徽安簧机械股份有限公司 | Spindle back taper hole machined back taper reamer cutter |
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