CN106271463B - A kind of processing method of index cam - Google Patents
A kind of processing method of index cam Download PDFInfo
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- CN106271463B CN106271463B CN201610865297.7A CN201610865297A CN106271463B CN 106271463 B CN106271463 B CN 106271463B CN 201610865297 A CN201610865297 A CN 201610865297A CN 106271463 B CN106271463 B CN 106271463B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The present invention is supplied to a kind of processing method of index cam, belongs to manufacture field, including the first step：Roughing, 1~2mm of reserved allowance after the completion of roughing；Second step：Semifinishing, half Precision Machining reserve 0.3~0.6mm of allowance after the completion；Third walks：Cylinder cambered surface is determined according to index cam shape and carries out the finishing of the cylinder cambered surface, and process tool as driving curve process outside in or to the sequence under using the equal parameter curves；4th step：The finishing of cam path side, carries out the finishing of lower turn side first, and the finishing except other cam path sides of lower corner is processed and then carried out using T-type knife；5th step：The Precision Machining of index cam both ends of the surface curved surface；6th step：Cam path is finished except other epimere sides of side curved surface；7th step：The finishing of side curved surface.High precision machining of the present invention, the curved surface smooth movements after processing.
Description
Technical field
The invention belongs to field of machining more particularly to a kind of processing methods of index cam.
Background technology
Indexing cam mechanism is mainly used as interrupted division, cam each rotation, and the driven member with roller rotates an angle
And rest a period of time, the size of rotational angle is different with the number of roller, and the ratio of idle hours and rotation time also may be used
Depending on as needed.
Indexing cam mechanism has been widely used in packing, printing, pharmacy, chemical industry, tobacco, electronic apparatus, glass ceramics,
The automatic production lines such as automobile making and various general machinery equipments, their core driven devices as automatic machinery, hair
Waving vital effect has good indexing accuracy height, high speed performance, smooth running, transmission torque big, since structure is tight
It gathers, transmission torque is big, especially suitable for high speed, precision round subsection, because of its dividing movement curve, may be designed to be suitable for various work
The optimal motion curve of occasion, to all have formedness in robust motion, noise reduction, extension mechanism service life etc.
Energy.
Index cam is due to its above feature, and for indexing grooves because of portion's systematicness of curve, processing is always a difficult point, is needed
The flatness and continuity for ensureing all indexing grooves, it is smooth during real-world operation to ensure.
Invention content
The problem to be solved in the present invention is to be to provide a kind of a kind of processing side for the index cam promoting machining accuracy
Method.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of processing method of index cam includes
The first step：Cylinder cambered surface is determined according to index cam shape and carries out the processing of cylinder cambered surface；
Second step：The finishing in turn face under cam path side, the lower turn face be cylinder cambered surface composition side and
It is vertical with the law vector of cylinder cambered surface, it is processed using T-type knife, the cutter head thickness of the T-type knife is equal to the lower turn face
Minimum constructive height, then carry out the finishing of other cam path sides of lower turn face；
Third walks：The Precision Machining of index cam end face curved surface, the end face curved surface are that index cam is adjacent with end face
Curved surface, along the intersection of the curved surface end face adjacent with curved surface, cutter shaft is arranged in parallel point of a knife with end face side curved surface after molding；
4th step：The finishing of cam path upper and lower section side first surface, the second curved surface, third curved surface and the 4th curve,
The first surface and the third curved surface are one group of composition epimere side, and second curved surface is one group with the 4th curved surface
Hypomere side is formed, one end of the third curved surface connects with one end of the first surface, and the other end connects with end face curved surface
Setting is vertically arranged with the cylinder cambered surface, and cutter uses slotting cutter, and point of a knife is along curved surface and corresponding adjacent hypomere curved surface
Intersection, cutter shaft is arranged in parallel with the curved surface after machine-shaping；
5th step：The first N-Side surf of side curved surface, the second N-Side surf, third N-Side surf, the 4th N-Side surf and the 5th lateral curvature
The finishing in face, first N-Side surf, the second N-Side surf, third N-Side surf are the song for connecting two cam path adjacent sides
Face, the 4th N-Side surf and the 5th N-Side surf are the side curved surface opposite with the end face curved surface.
2, the processing method of a kind of index cam according to claim 1, it is characterised in that：In the first step
In, steps are as follows：The first step：Roughing determines cylinder cambered surface according to index cam shape, using five axis of carbide end mill
3+2 orients milling, and according to back engagement of the cutting edge, successively ecto-entad is processed, and each layer of innermost ring cuts workpiece institute with an imaginary plane
The lateral cross section obtained carries out cutting along the profile and completes single layer cutting as profile, cutter, and processing is reserved after the completion of roughing
1~2mm of surplus；
Second step：Semifinishing, specific steps reserve allowance 0.3 after the completion with the first step, half Precision Machining
~0.6mm；
Third walks：Finishing：Determine the equal parameter curves of cylinder cambered surface, in process, process tool equal is joined with described
Number curve is that driving curve processed outside in or to the sequence under.
Further, in the first step, back engagement of the cutting edge 3mm, working engagement of the cutting edge 1mm.
Further, in the 5th step, the first N-Side surf, the second N-Side surf and the third that are changed greatly for corner
N-Side surf uses segmental machining, the curved sections that first processing curve law vector direction is not much different, cutter to use slotting cutter, cutter shaft flat
Row changes the curved sections being not much different in curved surface and with processing law vector, and point of a knife is along by selection curved surface curved surface adjacent thereto
Intersection.
The invention has the advantages and positive effects that：Compared with prior art, 1, the present invention is according to the spy of index cam
Point sets specific degree and is processed, high precision machining, and the surface accuracy machined is high, and transitional good,
It is noiseless during real-world operation, it is ensured that the smoothness of operating；2, at machining cam slot side, using T-type knife, it can be ensured that
T-type knife is not interfered with other turn sides in the case of back chipping, and work efficiency is high, and precision is high, can reach machining accuracy
Six grades；3, the qualification rate of this processing method finished product is high, it is contemplated that up to 99% or more.
Description of the drawings
The attached drawing for constituting the part of the present invention is used to provide further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is the structural schematic diagram of one circular arc cambered surface of case study on implementation of the present invention；
Fig. 2 is the structural schematic diagram that case study on implementation one of the present invention processes that cylinder cambered surface waits parameter curves in the process；
Fig. 3 is the machining path schematic diagram of the first cylinder cambered surface of case study on implementation and the second cylinder cambered surface of the present invention；
Fig. 4 is the machining path schematic diagram of case study on implementation third cylinder cambered surface and the 4th cylinder cambered surface of the present invention；
Fig. 5 is the structural schematic diagram in turn face and lower turn face on case study on implementation one of the present invention；
Fig. 6 is the structural schematic diagram of one T-type knife of case study on implementation of the present invention；
Fig. 7 is the structural schematic diagram of case study on implementation end face curved surface of the present invention；
Fig. 8 is the structural schematic diagram of one upper and lower section of curved surface of case study on implementation of the present invention；
Fig. 9 is the structural schematic diagram of case study on implementation one side curved surface of the present invention.
Reference numeral：
The first cylinder cambered surfaces of 1-；The second cylinder cambered surfaces of 2-；3- third cylinder cambered surfaces；The 4th cylinder cambered surfaces of 4-；It turns round under 5-
Face；It turns round on 6- face；The end faces 7- curved surface；8- first surfaces；The second curved surfaces of 9-；10- third curved surfaces；The 4th curved surfaces of 11-；33-
One N-Side surf；The second N-Side surfs of 34-；35- third N-Side surfs；The 4th N-Side surfs of 36-；The 5th N-Side surfs of 37-.
Specific implementation mode
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as pair
The limitation of the present invention.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply phase
To importance or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can
To express or implicitly include one or more this feature.In the description of the present invention, unless otherwise indicated, " multiple "
It is meant that two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
Specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
The present invention is a kind of processing method of index cam, including the first step：Cylinder cambered surface is determined according to index cam shape
And carry out the processing of cylinder cambered surface；
Second step：The finishing in turn face 5 under cam path side, lower turn face 5 be cylinder cambered surface composition side and with
The law vector of cylinder cambered surface is vertical, is processed using T-type knife, and the cutter head thickness of T-type knife is equal to the minimum height in lower turn face 5
Degree, then carries out the finishing of other cam path sides of lower turn face 5；
Third walks：The Precision Machining of index cam end face curved surface 7, end face curved surface 7 are the index cam song adjacent with end face
Face, along the intersection of the curved surface end face adjacent with curved surface, cutter shaft is arranged in parallel point of a knife with end face side curved surface after molding；
4th step：The upper and lower section side first surface 8 of cam path, the second curved surface 9, third curved surface 10 and the 4th curve 11
Finishing, first surface 8 and third curved surface 10 are one group of composition epimere side, and the second curved surface 9 and the 4th curved surface 11 are one group of group
At hypomere side, one end of third curved surface 10 connects with one end of first surface 8, the other end connect with end face curved surface 7 setting or
It is vertically arranged with cylinder cambered surface, cutter uses slotting cutter, and point of a knife is along the intersection of curved surface and corresponding adjacent hypomere curved surface, cutter shaft
It is arranged in parallel with the curved surface after machine-shaping；
5th step：Side curved surface the first N-Side surf 33, the second N-Side surf 34, third N-Side surf 35,36 and of the 4th N-Side surf
The finishing of 5th N-Side surf 37, the first N-Side surf 33, the second N-Side surf 34, third N-Side surf 35 are two cam path phases of connection
The curved surface of adjacent side, the 4th N-Side surf 36 and the 5th N-Side surf 37 are the side curved surface opposite with end face curved surface 7.
Preferably, in the first step, steps are as follows：The first step：Roughing determines cylinder arc according to index cam shape
Face orients milling using five axis 3+2 of carbide end mill, and according to back engagement of the cutting edge, successively ecto-entad is processed, and each layer most
Inner ring cuts the lateral cross section obtained by workpiece as profile using an imaginary plane, and cutter carries out cutting completion single layer along profile and cuts
It cuts, 1~2mm of reserved allowance after the completion of roughing；
Second step：Semifinishing, the same first step of specific steps, reserved allowance 0.3 after the completion of half Precision Machining~
0.6mm；
Third walks：Finishing：Determine the equal parameter curves of cylinder cambered surface, in process, process tool with etc. parameters it is bent
Line is that driving curve processed outside in or to the sequence under.
Preferably, in the first step, back engagement of the cutting edge 3mm, working engagement of the cutting edge 1mm.
Preferably, in the 5th step, the first N-Side surf 33, the second N-Side surf 34 and the third side that are changed greatly for corner
Curved surface 35 uses segmental machining, the curved sections that first processing curve law vector direction is not much different, cutter to use slotting cutter, cutter shaft flat
Row changes the curved sections being not much different in curved surface and with processing law vector, and point of a knife is along by selection curved surface curved surface adjacent thereto
Intersection.
Case study on implementation 1：It is described in detail by taking five slot index cams as an example below, the material of five slot index cams is
40Cr, the first step, roughing：Roughing orients millings using five axis 3+2, using the carbide end mill of φ 10, one layer one
Layer cutting takes 3mm per layer depth, that is, back engagement of the cutting edge, and each layer of innermost ring is all that an imaginary plane cuts the section obtained by workpiece
Profile, cutter is along the profile, and one encloses processing outward, and circle spacing, that is, working engagement of the cutting edge takes 1mm, until this layer of all excess stock
All it is removed, cutter enters next layer, and until all layers of cutting finish, in this process, most of extra material is removed,
Distance Theory dimensioned surplus is 1mm.
Second step：Semifinishing：Semifinishing orients millings using five axis 3+2, using carbide end mill, one layer one
Layer cutting, per layer depth, that is, back engagement of the cutting edge:0.3~0.8mm, each layer are all the section wheels obtained by an imaginary plane section workpiece
Exterior feature, for cutter on the outside of the profile, Distance Theory dimensioned surplus is 0.3mm, until this layer of all excess stocks are all removed,
Cutter enters next layer, until all layers of cutting finish.
Third walks：The finishing on cylindrical surface, six convex ridges are shared in cam pilum gabarit, and six convex ridges form five cams
Bottom surface cylindrical surface is divided into five cylinder cambered surfaces by slot, five cam paths, and there are four types of different shapes, corresponding bottom surfaces for cam path
Cylinder cambered surface has the first cylinder cambered surface 1, the second cylinder cambered surface 2, third cylinder cambered surface 3,4 four kinds of the 4th cylinder cambered surface, such as Fig. 1 institutes
Show, wherein third cylinder cambered surface 3 there are identical two.Since cam groove shape is more complicated, direction change is more, angle change
It is larger, be not suitable for selecting general streamlined cutter track track.
The first cylinder cambered surface 1, the second cylinder cambered surface are cut with the equidistant parallel face (parallel interplanar distance is 3mm) for being parallel to end face
2, third cylinder cambered surface 3 and the 4th cylinder cambered surface 4 obtain the equal parameter curves of each cambered surface, as shown in Figure 2.
The driving curve of cutter, keeps point of a knife bent along driving when being processed using these equal parameter curves as each cylinder cambered surface
Line moves.In order to make cutter track more normative and reasonable, for the first cylinder cambered surface 1 and the second cylinder cambered surface 2, the driving of each curve is suitable
Sequence is carried out as shown in Fig. 3 arrows, and for third cylinder cambered surface 3 and the 4th cylinder cambered surface 4, the driving sequence of each curve presses Fig. 4 institutes
Show progress.
4th step：Under cam path turn side finish, index cam include five cylinder cambered surfaces, be clipped in respectively five pairs it is convex
On race side, if each cam path side is made of dried noodle, each cam path side is made of plane and curved surface, wherein all
Curved surface is made of upper turn face and lower turn face, wherein lower turn face is vertical with the law vector of cylinder cambered surface, lower turn face 5 and upper
Turn face 6 is a pair, and one shares ten pairs, as shown in figure 5, since the angle between lower turn face 5 and upper turn face 6 is
177.64 °, therefore lower turn face 5 cannot be processed using slotting cutter, can not back chipping, lower turn face 5, T-type knife are processed using T-type knife
As shown in fig. 6, size t, that is, tip size is equal to the minimum constructive height h in lower turn face 5 on T-type knife, to ensure in the case of back chipping
T-type knife is not interfered with upper turn face 6, and T-type cutter track diameter is along the intersection of cylinder cambered surface and turn face under ten pairs, cutter axis orientation
It is arranged in parallel with corresponding lower turn face.
Then carry out the finishing in other lower turn faces of cam path, cutter uses slotting cutter, point of a knife along cylinder cambered surface with
Side intersection movement, cutter axis orientation are arranged in parallel with all lower turn faces except lower turn face 5.
5th step：The finishing of end face curved surface 7, as shown in fig. 7, there are six the index cam curved surfaces adjacent with end face, often
A end face be three, the processing of end face curved surface, cutter use slotting cutter, point of a knife along the curved surface end face adjacent with curved surface friendship
Line, cutter shaft is parallel with three curved surfaces of end face side, and other side overturns the Z-direction of coordinate system, is carried out using same method
Cutter track Trajectory Design and processing.
6th step:Cam path is finished except other epimere sides of side curved surface, and cam path removes the epimere curved surface of side curved surface
20 altogether, as shown in figure 8,20 upper end curved surfaces include that first surface 8, the second curved surface 9, third curved surface 10 and the 4th are bent
Line 11, wherein first surface 8 and third curved surface 10 are one group and end to end, are located at cam parts one end, the second curved surface 9 and the
Four curves 11 are for one group and end to end, are located at the other end of the cam parts far from first surface 8, for the first cylinder cambered surface 1
With the 4th cylinder cambered surface 4, one end of first surface 8 connects with upper turn face 6, and the other end connects with one end of third curved surface 10,
The other end of third curved surface 10 connects setting with end face curved surface 7, for the second cylinder cambered surface 2, one end of first surface 8 with above turn
Bent face 6 connects, and the other end connects with one end of third curved surface 10, and the other end of third curved surface 10 is vertical with third cylinder cambered surface 3
Setting, for third cylindrical surface 3, first surface 8 includes two small curved surfaces, and one end connects setting with third curved surface 10, another
End is vertically arranged with third cylinder cambered surface 3, and 8 third curved surface 10 of the first surface and the variation of 11 corner of the 4th curve are releived, the
One curved surface 8 and the variation of 9 corner of the second curved surface are greatly and anxious, first process first surface 8, and cutter uses slotting cutter, and point of a knife is along first
The intersection of curved surface 8 and corresponding adjacent hypomere curved surface, cutter shaft is parallel with first surface 8, and processing third curved surface 10, cutter is using vertical
Milling cutter, for point of a knife along the intersection of third curved surface 10 and corresponding adjacent hypomere curved surface, cutter shaft is parallel with 10 curved surface of third curved surface, turns over
The Z-direction for turning coordinate system carries out cutter track Trajectory Design using identical method to curved surface the second curved surface 9 and the 4th curve 11 and adds
Work during actual processing, can also first process the second curved surface 9 and the 4th curve 11, post-processing first surface 8 and third curved surface
10。
7th step：The finishing of side curved surface, as shown in figure 9, side curved surface includes two cam path adjacent sides of connection
Curved surface, share three sections, be the first N-Side surf 33, the second N-Side surf 34 and third N-Side surf 35 respectively, each section of N-Side surf is all
It is made of several curved surfaces, each N-Side surf is all tangent relation, and side curved surface further includes the 4th N-Side surf 36 and the 5th lateral curvature
Face 37, the first N-Side surf 33, the second N-Side surf 34 and 35 corner of third N-Side surf change very greatly, by the way of segmental machining,
The curved sections that first processing curve law vector direction is not much different, cutter use slotting cutter, cutter shaft be parallel to the 5th N-Side surf 37 and
Change the song being not much different with 37 law vector of the 5th N-Side surf in first N-Side surf 33, the second N-Side surf 34 and third N-Side surf 35
Face section, point of a knife process other curved sections, finally along by the intersection of selection curved surface curved surface adjacent thereto using identical method
Complete the processing of entire index cam.
One embodiment of the present invention has been described in detail above, but the content be only the present invention preferable implementation
Example should not be construed as limiting the practical range of the present invention.It is all according to all the changes and improvements made by the present patent application range
Deng should all still fall within the scope of the patent of the present invention.
Claims (4)
1. a kind of processing method of index cam, it is characterised in that：
The first step：Cylinder cambered surface is determined according to index cam shape and carries out the processing of cylinder cambered surface；
Second step：The finishing of turn face (5) under cam path side, the lower turn face (5) are the composition side of cylinder cambered surface
And it is vertical with the law vector of cylinder cambered surface, it is processed using T-type knife, the cutter head thickness of the T-type knife is equal to the lower turn
The minimum constructive height in face (5) then carries out the finishing of lower turn face (5) other cam path sides；
Third walks：The Precision Machining of index cam end face curved surface (7), the end face curved surface (7) are that index cam is adjacent with end face
Curved surface, along the intersection of the curved surface end face adjacent with curved surface, cutter shaft is arranged in parallel point of a knife with end face side curved surface after molding；
4th step：The upper and lower section side first surface (8) of cam path, the second curved surface (9), third curved surface (10) and the 4th curve
(11) finishing, the first surface (8) and the third curved surface (10) are one group of composition epimere side, second curved surface
(9) with the 4th curved surface (11) it is one group of composition hypomere side, one end and the first surface of the third curved surface (10)
(8) one end connects, and the other end connects with end face curved surface (7) to be arranged or be vertically arranged with the cylinder cambered surface, and cutter is using vertical
Milling cutter, along the intersection of curved surface and corresponding adjacent hypomere curved surface, cutter shaft is arranged in parallel point of a knife with the curved surface after machine-shaping；
5th step：The first N-Side surf of side curved surface (33), the second N-Side surf (34), third N-Side surf (35), the 4th N-Side surf
(36) and the finishing of the 5th N-Side surf (37), first N-Side surf (33), the second N-Side surf (34), third N-Side surf (35)
To connect the curved surface of two cam path adjacent sides, the 4th N-Side surf (36) and the 5th N-Side surf (37) are and the end face
The opposite side curved surface of curved surface (7).
2. a kind of processing method of index cam according to claim 1, it is characterised in that：In the first step, step
It is rapid as follows：The first step：Roughing determines cylinder cambered surface according to index cam shape, fixed using five axis 3+2 of carbide end mill
To milling, according to back engagement of the cutting edge, successively ecto-entad is processed, and each layer of innermost ring is cut with an imaginary plane obtained by workpiece
Lateral cross section carries out cutting along the profile and completes single layer cutting as profile, cutter, reserved allowance 1 after the completion of roughing
~2mm；
Second step：Semifinishing, specific steps with the first step, reserved allowance 0.3 after the completion of half Precision Machining~
0.6mm；
Third walks：Finishing：Determine the equal parameter curves of cylinder cambered surface, in process, process tool is with the parameters such as described song
Line is that driving curve processed outside in or to the sequence under.
3. a kind of processing method of index cam according to claim 1, it is characterised in that：In the first step, the back of the body
Bite is 3mm, working engagement of the cutting edge 1mm.
4. a kind of processing method of index cam according to claim 1, it is characterised in that：In the 5th step, needle
The first N-Side surf (33), the second N-Side surf (34) and the third N-Side surf (35) changed greatly to corner uses segmental machining, first
The curved sections that processing curve law vector direction is not much different, cutter use slotting cutter, cutter shaft to be parallel to curved surface and engineering method to be added arrow
The curved sections that amount variation is not much different, point of a knife is along by the intersection of selection curved surface curved surface adjacent thereto.
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| CN111659954A (en) * | 2020-05-14 | 2020-09-15 | 南通大学 | Device and method for machining worm-type indexing cam |
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| CN107186434B (en) * | 2017-06-02 | 2019-03-08 | 武汉船用机械有限责任公司 | A kind of main cable saddle of suspension bridge numerical control boring and milling back chipping method |
| CN107127533B (en) * | 2017-06-19 | 2019-04-02 | 济南大学 | A kind of manufacturing process of two-piece type parallel graduated cam |
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| JPH07246508A (en) * | 1994-03-10 | 1995-09-26 | Kobe Steel Ltd | End mill for processing high strength material |
| CN100335818C (en) * | 2003-12-31 | 2007-09-05 | 天津工业大学 | Arc surface calibratkon cam mechanism and its processing method |
| DE102008010252A1 (en) * | 2008-02-20 | 2009-08-27 | Rolls-Royce Deutschland Ltd & Co Kg | Method and tool for annulus machining a gas turbine rotor with integrally molded blades |
| CN103264262B (en) * | 2013-05-24 | 2015-06-24 | 武汉群峰机械有限公司 | Machining technology of cam reinforcement lever mechanism |
| CN104128759A (en) * | 2014-07-24 | 2014-11-05 | 成都亨通兆业精密机械有限公司 | Lathe spindle machining process beneficial to spindle surface hardness |
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| CN111659954A (en) * | 2020-05-14 | 2020-09-15 | 南通大学 | Device and method for machining worm-type indexing cam |
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