CN107160189A - A kind of slender shaft turning device and processing method - Google Patents
A kind of slender shaft turning device and processing method Download PDFInfo
- Publication number
- CN107160189A CN107160189A CN201710462965.6A CN201710462965A CN107160189A CN 107160189 A CN107160189 A CN 107160189A CN 201710462965 A CN201710462965 A CN 201710462965A CN 107160189 A CN107160189 A CN 107160189A
- Authority
- CN
- China
- Prior art keywords
- guide pillar
- frock
- tailstock
- bushing
- centering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/72—Auxiliary arrangements; Interconnections between auxiliary tables and movable machine elements
- B23Q1/76—Steadies; Rests
- B23Q1/766—Steadies or rests moving together with the tool support
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B25/00—Accessories or auxiliary equipment for turning-machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q2240/00—Machine tools specially suited for a specific kind of workpiece
- B23Q2240/007—Elongated workpieces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q2703/00—Work clamping
- B23Q2703/02—Work clamping means
- B23Q2703/10—Devices for clamping workpieces of a particular form or made from a particular material
Abstract
The present invention provides a kind of slender shaft turning device and processing method, including follow-rest frock and tailstock frock, follow-rest frock includes horizontal guide pillar, vertical guide pillar, top body, bushing and bottom plate, and horizontal guide pillar and vertical guide pillar are intersecting, and top body is arranged on horizontal guide pillar and vertical guide pillar intersection.Tailstock frock includes self-centering clamping set, sleeve and live centre, and live centre is arranged in sleeve, sleeve and the cylindrical interference fit of live centre, and the external taper of sleeve covers with self-centering clamping to be coordinated.The present invention discloses a kind of slender shaft turning device and processing method, the installation way drawn using a folder one, can eliminate because workpiece bows caused by the temperature rise in working angles and clamping force are deformed, can improve machining accuracy and surface quality.
Description
Technical field
The invention belongs to machining technology field, and in particular to a kind of slender shaft turning device and processing method.
Background technology
In many industries such as machinery, Aero-Space and military project, thin and long shafts part application is more and more extensive, and diameter compared with
The larger slender axles of small, draw ratio are using more and more, such as C919 hatch door rotating shafts, and length is L773mm, a diameter of 11.2mm, long
Footpath ratio about 70, and the linearity and surface roughness requirements of this kind of axle are higher, the linearity of this hatch door rotating shaft is 0.1mm, surface
Roughness Ra is 0.8 μm, and such slender axles bring very big challenge to traditional diamond-making technique.
Conventional processing method has two kinds at present：
Method one：Centre frame supports slender shaft turning
Slender axles are supported using centre frame, segmentation cutting, installation way is generally the top of a folder one.Centre frame is directly supported at workpiece
Half is reduced in centre, so supporting slender axles draw ratio, and workpiece rigidly increases, after complete one section of turning, another section of turning of turning around.
Method two：Follow-rest supports slender shaft turning
Follow-rest is fixed on saddle, and follow-rest follows lathe tool to move, and increases the rigidity of workpiece, Reducing distortion, installation way one
As for one folder one push up.Because workpiece is originally experienced Action of Gravity Field, during turning workpiece support claw can be instantaneously left because of centrifugal action and
Produce vibration.
Above method can play a role in the slender axles that requirement on machining accuracy is not high, draw ratio is little, but
There is problems with when processing big L/D ratio, high-precision slender axles：
1st, method one aids in turning using centre frame, although centre frame can improve the rigidity of workpiece, segmentation cutting, efficiency is low,
And segmentation turning can occur connecing knife mark in workpiece surface, and the installation way on the top of a folder one easily makes workpiece produce flexural deformation,
It can not be used for the higher slender axles of dimension precision requirement.
2nd, method two is using conventional follow-rest auxiliary turning, during actual processing, by cutting force and centrifugation masterpiece
With, easily cause follow-rest support claw and instantaneously depart from excircle of workpiece, and the installation way on the top of a folder one easily produces workpiece
Flexural deformation, it is difficult to ensure dimensional accuracy and surface quality.
The content of the invention
To be solved by this invention is that existing machining precision of long and thin Shafts is not high, it is impossible to meet the technical problem of quality requirement,
A kind of slender shaft turning device and processing method are provided, in order to eliminate because of the workpiece bows deformation that clamping is improper and produces, used
One folder one draws installation way, and one end of follow-rest frock uses clamping with three-jaw chuck, and tailstock tenses workpiece using special tooling, real
Referring now to stabilization, the highly-efficient processing of the slender axles part that draw ratio is big, required precision is high.
In order to solve the technical problem of the present invention, the present invention is achieved by the following technical solutions：A kind of slender axles add
Frock is put, including follow-rest frock 1 and tailstock frock 2, and the follow-rest frock 1 includes horizontal guide pillar 11, vertical guide pillar 12, top
Head body 13, bushing 14 and bottom plate 15, the horizontal guide pillar 11 and vertical guide pillar 12 intersect, and top body 13 interference fit is installed
In horizontal guide pillar 11 and the intersection of vertical guide pillar 12；Described one end of horizontal guide pillar 11 is provided with adjusting screw I 16, and the other end is provided with fixed
Position screw I 17, described vertical one end of guide pillar 12 is provided with adjusting screw II 18, and the other end is provided with positioning screw II 19, and rotation is described
Adjusting screw I 16, adjusting screw II 18, make horizontal guide pillar 11 and vertical guide pillar 12 compress the top body 13, perpendicular to top
Attacked on the center line of the axial hole of body 13 in holes drilled through, the through hole of the elastic conjunction of bushing 14 to the top body 13, it is described fixed
Position screw I 17, positioning screw II 19 are used to compress the bushing 14；The tailstock frock 2 includes self-centering clamping set 21, set
Cylinder 22 and live centre 23, the live centre 23 are arranged in sleeve 22, and the sleeve 22 and the live centre 23 are cylindrical
Interference fit, external taper and the self-centering clamping set 21 of the sleeve 22 coordinate.
A kind of processing method of slender shaft turning device, comprises the following steps：
The first step：Tailstock frock 2 is installed and centering：Tailstock frock 2 is arranged on tail stock, using Morse taper shank structure, will
Tailstock center is unloaded on lathe, changes tailstock frock 2 and centering.
Second step：Machine tool chief axis is adjusted with tailstock axiality：Concentricity school rod is installed, tailstock and master are corrected using amesdial
Axle axiality, is adjusted to the acceptable bounce of processing.
3rd step：Follow-rest frock is installed and centering：Using horizontal guide pillar 11, follow-rest frock 1 is arranged on lathe, peace
The position of bushing 14 is adjusted after dress, it is ensured that bushing 14 and lathe spindle are coaxial；Positioning screw I 17 adjusts bushing 14 with horizontal guide pillar 11
Position in the horizontal direction, vertical guide pillar 12 adjusts bushing 14 in the position of vertical direction with adjusting screw II 18.
4th step：Clamping workpiece：The installation way that clamping workpiece is drawn using a folder one, utilizes lathe chuck clamping parts one
Self-centering clamping covers the 21 clamping parts other ends in end, tailstock frock 2, and rotation centering gripping sleeve 21 makes 2 pair zero of tailstock frock
Part applies horizontal direction pulling force, fixes part.
5th step：Work pieces process：Beated after table correction parts fixation is beaten before processing part, zero is processed using turnery processing
Part.
Compared with prior art, the beneficial effect that obtains of the present invention is：
A kind of slender shaft turning device disclosed by the invention and processing method, using one folder one draw installation way, eliminate due to
Workpiece bows caused by temperature rise and clamping force in working angles are deformed, and greatly improve machining accuracy and surface quality.
A kind of slender shaft turning device disclosed by the invention and processing method, the folder to workpiece is realized using tailstock frock
Draw, energy self-centering, positioning precision is high, high in machining efficiency, suitable for batch production.
A kind of slender shaft turning device disclosed by the invention and processing method, using follow-rest frock, enhancing slender axles are firm
Property, workpiece bounce is limited by coming directly towards body and positioning screw, can effectively suppress workpiece cutting vibration.
A kind of slender shaft turning device disclosed by the invention and processing method, a whole set of tool structure are simple, are skillfully constructed, just
In manufacture, cost is low, is more than 70 applied to processing draw ratio, diameter is between 10-15mm, and straightness error 0.1mm, surface is thick
Rugosity Ra is less than 0.8 μm of slender axles.
Brief description of the drawings
Fig. 1 is follow-rest tool structure schematic diagram.
Fig. 2 is tailstock tool structure schematic diagram.
Reference：1st, follow-rest frock；11st, horizontal guide pillar；12nd, vertical guide pillar；13rd, body is come directly towards；14th, bushing；15th, bottom
Plate；16th, adjusting screw I；17th, positioning screw I；18th, adjusting screw II；19th, positioning screw II；2nd, tailstock frock；21st, it is automatic fixed
Heart gripping sleeve；22nd, sleeve；23rd, live centre.
Embodiment
Below in conjunction with the accompanying drawings, embodiment is described in detail.
Referring to accompanying drawing 1 and accompanying drawing 2, a kind of slender shaft turning device, including follow-rest frock 1 and tailstock frock 2, it is described with
Knife rest frock 1 includes horizontal guide pillar 11, vertical guide pillar 12, top body 13, bushing 14 and bottom plate 15, the horizontal guide pillar 11 and hangs down
Straight guide pillar 12 intersects, and top body 13 interference fit is arranged on horizontal guide pillar 11 and the intersection of vertical guide pillar 12；The level
The one end of guide pillar 11 is provided with adjusting screw I 16, and the other end is provided with positioning screw I 17, and described vertical one end of guide pillar 12 is provided with adjustment spiral shell
II 18 are followed closely, the other end is provided with positioning screw II 19, rotate the adjusting screw I 16, adjusting screw II 18, make the horizontal He of guide pillar 11
Vertical guide pillar 12 compresses the top body 13, and holes drilled through, the bushing 14 are attacked on the center line of the top axial hole of body 13
Elastic conjunction is into the through hole of the top body 13, and the positioning screw I 17, positioning screw II 19 are used to compress the bushing
14；The tailstock frock 2 includes self-centering clamping set 21, sleeve 22 and live centre 23, and the live centre 23 is arranged on
In sleeve 22, the sleeve 22 and the cylindrical interference fit of the live centre 23, the external taper of the sleeve 22 with it is described automatically
Centering gripping sleeve 21 coordinates.
A kind of processing method of slender shaft turning device, comprises the following steps：
The first step：Tailstock frock 2 is installed and centering：As shown in accompanying drawing Fig. 2, tailstock frock 2 is arranged on tail stock, using not
Family name's taper shank structure, tailstock center on lathe is unloaded, and is changed tailstock frock 2 and centering, is realized using tailstock frock to workpiece
Folder draw, can self-centering, positioning precision is high, high in machining efficiency, suitable for batch production.
Second step：Machine tool chief axis is adjusted with tailstock axiality：Concentricity school rod is installed, tailstock and master are corrected using amesdial
Axle axiality, is adjusted to the acceptable bounce of processing.
3rd step：Follow-rest frock is installed and centering：As shown in Figure 1, using horizontal guide pillar 11, follow-rest frock 1 is pacified
On lathe, the position of bushing 14 is adjusted after installation, it is ensured that bushing 14 and lathe spindle are coaxial；Positioning screw I 17 is led with level
The position of the adjustment of post 11 bushing 14 in the horizontal direction, vertical guide pillar 12 adjusts bushing 14 in vertical direction with adjusting screw II 18
Position；Using follow-rest frock, enhancing slender axles rigidity limits workpiece bounce by coming directly towards body and positioning screw, can be effectively
Suppress workpiece cutting vibration.
4th step：Clamping workpiece：The installation way that clamping workpiece is drawn using a folder one, utilizes lathe chuck clamping parts one
Self-centering clamping covers the 21 clamping parts other ends in end, tailstock frock 2, and rotation centering gripping sleeve 21 makes 2 pair zero of tailstock frock
Part applies horizontal direction pulling force, fixes part；The installation way drawn using a folder one, is eliminated due to the temperature rise in working angles
And workpiece bows caused by clamping force are deformed, and greatly improve machining accuracy and surface quality.
5th step：Work pieces process：Beated after table correction parts fixation is beaten before processing part, zero is processed using turnery processing
Part.
Listed above is only one of specific embodiment of the present invention.It is clear that the invention is not restricted to which above example, may be used also
To there is many similar reshapings.What one of ordinary skill in the art directly can export or associate from present disclosure
All deformations, are considered as invention which is intended to be protected.
Claims (2)
1. a kind of slender shaft turning device, it is characterised in that：Including follow-rest frock（1）With tailstock frock（2）, the follow-rest
Frock（1）Including horizontal guide pillar（11）, vertical guide pillar（12）, top body（13）, bushing（14）And bottom plate（15）, the level leads
Post（11）With vertical guide pillar（12）It is intersecting, the top body（13）Interference fit is arranged on horizontal guide pillar（11）With vertical guide pillar
（12）Intersection；The horizontal guide pillar（11）One end is provided with adjusting screw I（16）, the other end is provided with positioning screw I（17）, it is described
Vertical guide pillar（12）One end is provided with adjusting screw II（18）, the other end is provided with positioning screw II（19）, rotate the adjusting screw I
（16）, adjusting screw II（18）, make horizontal guide pillar（11）With vertical guide pillar（12）Compress the top body（13）, perpendicular to top
Body（13）Holes drilled through, the bushing are attacked on the center line of axial hole（14）Elastic conjunction is to the top body（13）Through hole in,
The positioning screw I（17）, positioning screw II（19）For compressing the bushing（14）；The tailstock frock（2）Including automatic
Centering gripping sleeve（21）, sleeve（22）And live centre（23）, the live centre（23）Installed in sleeve（22）In, the set
Cylinder（22）With the live centre（23）Cylindrical interference fit, the sleeve（22）External taper and the self-centering clamping set
（21）Coordinate.
2. a kind of processing method of slender shaft turning device as claimed in claim 1, it is characterised in that：Comprise the following steps：
The first step：Tailstock frock（2）Install and centering：Tailstock frock（2）On tail stock, using Morse taper shank knot
Structure, tailstock center on lathe is unloaded, and changes tailstock frock（2）And centering；
Second step：Machine tool chief axis is adjusted with tailstock axiality：Concentricity school rod is installed, tailstock is corrected using amesdial and main shaft is same
Axle degree；
3rd step：Follow-rest frock is installed and centering：Utilize horizontal guide pillar（11）, follow-rest frock（1）On lathe, peace
Bushing is adjusted after dress（14）Position, it is ensured that bushing（14）It is coaxial with lathe spindle；Positioning screw I（17）With horizontal guide pillar（11）Adjust
Whole bushing（14）Position in the horizontal direction, vertical guide pillar（12）With adjusting screw II（18）Adjust bushing（14）In vertical direction
Position；
4th step：Clamping workpiece：The installation way that clamping workpiece is drawn using a folder one, using lathe chuck clamping parts one end,
Tailstock frock（2）Middle self-centering clamping set（21）The clamping parts other end, rotation centering gripping sleeve（21）, make tailstock frock
（2）Horizontal direction pulling force is applied to part, part is fixed；
5th step：Work pieces process：Beated after table correction parts fixation is beaten before processing part, part is processed using turnery processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710462965.6A CN107160189A (en) | 2017-06-19 | 2017-06-19 | A kind of slender shaft turning device and processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710462965.6A CN107160189A (en) | 2017-06-19 | 2017-06-19 | A kind of slender shaft turning device and processing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107160189A true CN107160189A (en) | 2017-09-15 |
Family
ID=59819788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710462965.6A Pending CN107160189A (en) | 2017-06-19 | 2017-06-19 | A kind of slender shaft turning device and processing method |
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| CN (1) | CN107160189A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107855812A (en) * | 2017-11-08 | 2018-03-30 | 信利光电股份有限公司 | A kind of processing tool and processing method of thin and long shafts part turning |
| CN107855924A (en) * | 2017-11-24 | 2018-03-30 | 四川凌峰航空液压机械有限公司 | The outer frosted wheel track elastic support of grinding machine |
| CN108581578A (en) * | 2018-02-02 | 2018-09-28 | 中国电子科技集团公司第三十八研究所 | A kind of axially position device for turning shaft-like workpiece |
| CN109848495A (en) * | 2019-03-13 | 2019-06-07 | 大连工业大学 | Elongated shaft Working piece positioning device applied to electrical-chemistry method |
| CN114083361A (en) * | 2021-11-25 | 2022-02-25 | 航天科工哈尔滨风华有限公司 | Special concentric positioning device and method for grinding nonstandard ultra-long hard alloy cutter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4631995A (en) * | 1985-11-18 | 1986-12-30 | Vroenen John J | Tooling apparatus |
| CN2055755U (en) * | 1989-07-19 | 1990-04-11 | 时建国 | Special device for turning precise and super thin and long threaded rod |
| CN201324947Y (en) * | 2008-12-04 | 2009-10-14 | 上海海事大学 | Long shaft processing special tooling |
| CN205111292U (en) * | 2015-11-24 | 2016-03-30 | 浙江震环数控机床有限公司 | A follow -rest for processing slender axles |
-
2017
- 2017-06-19 CN CN201710462965.6A patent/CN107160189A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4631995A (en) * | 1985-11-18 | 1986-12-30 | Vroenen John J | Tooling apparatus |
| CN2055755U (en) * | 1989-07-19 | 1990-04-11 | 时建国 | Special device for turning precise and super thin and long threaded rod |
| CN201324947Y (en) * | 2008-12-04 | 2009-10-14 | 上海海事大学 | Long shaft processing special tooling |
| CN205111292U (en) * | 2015-11-24 | 2016-03-30 | 浙江震环数控机床有限公司 | A follow -rest for processing slender axles |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107855812A (en) * | 2017-11-08 | 2018-03-30 | 信利光电股份有限公司 | A kind of processing tool and processing method of thin and long shafts part turning |
| CN107855924A (en) * | 2017-11-24 | 2018-03-30 | 四川凌峰航空液压机械有限公司 | The outer frosted wheel track elastic support of grinding machine |
| CN108581578A (en) * | 2018-02-02 | 2018-09-28 | 中国电子科技集团公司第三十八研究所 | A kind of axially position device for turning shaft-like workpiece |
| CN108581578B (en) * | 2018-02-02 | 2023-08-11 | 中国电子科技集团公司第三十八研究所 | Axial positioner for turning shaft workpiece |
| CN109848495A (en) * | 2019-03-13 | 2019-06-07 | 大连工业大学 | Elongated shaft Working piece positioning device applied to electrical-chemistry method |
| CN114083361A (en) * | 2021-11-25 | 2022-02-25 | 航天科工哈尔滨风华有限公司 | Special concentric positioning device and method for grinding nonstandard ultra-long hard alloy cutter |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
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Application publication date: 20170915 |