CN102688927A - Forward spinning mechanism for cylindrical member - Google Patents
Forward spinning mechanism for cylindrical member Download PDFInfo
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- CN102688927A CN102688927A CN2012101447511A CN201210144751A CN102688927A CN 102688927 A CN102688927 A CN 102688927A CN 2012101447511 A CN2012101447511 A CN 2012101447511A CN 201210144751 A CN201210144751 A CN 201210144751A CN 102688927 A CN102688927 A CN 102688927A
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Abstract
The invention discloses a forward spinning mechanism for cylindrical member. A spinning wheel seat of the spinning machine is fitted on the spinning wheel seat fitting section of a spinning wheel spindle; a spinning wheel is mounted on the spinning wheel mounting section of the spinning wheel spindle and fixed on the end face of the positioning boss of the spinning wheel spindle; a fixation clamp plate is fitted on a press ring mounting section via a pair of angular contact bearings and a press ring is fitted on the outer circumference of the fixation clamp plate; a set nut is fitted on a set nut mounting section; and the spinning wheel spindle, the spinning wheel and the press ring have coincident axial lines. According to the forward spinning mechanism provided by the invention, the press ring freely rotates relative to the spinning wheel and the spinning wheel spindle to reduce friction between the blank and the press ring and exert inward radial extruding effects on the blank bulging in front of the spinning wheel during the spinning process so as to limit outward radial flow of material in front of the spinning wheel, promote axial flow of the material during processing, inhibit diameter expansion of the blank in the non-spinning region, make deformation of the cylindrical member smooth during the forming process and finally prevent bell mouth generation at the tail end of the blank at the late stage of spinning.
Description
Technical field
The invention belongs to the rotary pressing processing field, specifically is a kind of cylindrical member forward spinning machine that is used for.
Background technology
Cylindrical member forward spinning is to be used to be shaped a kind of continuous local plastic manufacturing process of high accuracy thin-wall tube-shaped element, has characteristics such as spinning force is little, production efficiency is high, labour intensity is little.In cylindrical member forward spinning process, tubular blank one end fixes and makes tubular blank axis and core dead in line through clamping device and core, drives the synchronous rotation of blank and core through the active rotation of core.Spinning roller is axially done straight-line feed to the tubular blank other end along core and is moved, and makes the elongation of tubular sotck thinkness attenuate length form the thin-walled long tubular workpiece.
But in cylindrical member forward spinning latter stage, because the constraint that blank tail end material receives is less, material flowing phase is to freedom, and the tail end material flows and can produce hole enlargement and form similar bell-mouthed defective spinning process can't be proceeded.For above-mentioned situation, common processing method is to strengthen the axial allowance of blank, make spinning roller not be screwed into the tail end of blank, and the horn mouth that after spinning finishes, tail end is produced excises with the method for machining.This obviously can reduce the utilization rate of material, increases cost.Therefore, take measures to suppress bell-mouthed formation, increase the mould pressing segment length,, reduce cost, especially for precious metal, have very important meaning for improving stock utilization.
At present; In the prior art, the bell-mouthed processing method that produces to cylindrical member forward spinning tail end in latter stage except above-described the blank tail end reserve certain allowance and the method excision that behind spinning, adds with machine, also have through after accomplishing at spinning; The horn mouth of workpiece tail end is shunk and eliminated to the reducing spinning operation of additional multi-pass; But this multi-pass reducing operation can extend manufacture cycle greatly, low operating efficiency, and when workpiece tail end horn mouth is carried out reducing; Unstability very easily takes place in the tail end material, can produce wrinkling when serious or breaks.In sum, do not propose as yet in the existing technology and can suppress the bell-mouthed method of cylindrical member forward spinning tail end pointedly effectively.
Summary of the invention
In order to prevent that tail end produces horn mouth in the cylindrical member forward spinning process, increase spinning spare length, improve stock utilization, reduce cost, the present invention proposes a kind of cylindrical member forward spinning machine that is used for.
The present invention includes spinning roller mandrel, spinning roller, trim ring, fixed cover, sleeve, a pair of angular contact bearing and bearing (ball) cover;
Wherein:
Described spinning roller mandrel is the Pyatyi multidiameter, has formed rotary wheel base respectively and has cooperated section, positioning boss, spinning roller construction section, trim ring construction section and mark closely the nut construction section; Mark closely the end that the nut construction section is positioned at the spinning roller mandrel, rotary wheel base cooperates section to be positioned at the other end of spinning roller mandrel; The trim ring construction section is positioned at marks closely nut construction section inboard; The spinning roller construction section is between trim ring construction section and the rotary wheel base section of cooperation, and this spinning roller construction section has the radially positioning boss of protrusion with the rotary wheel base section of cooperation adjoiner;
The rotary wheel base that the rotary wheel base of spinning machine is sleeved on the spinning roller mandrel cooperates on the section; Spinning roller is installed on the spinning roller construction section of spinning roller mandrel, and is fixed on the end face of positioning boss of spinning roller mandrel; Fixed cover is sleeved on the trim ring construction section through a pair of angular contact bearing, and trim ring is sleeved on the excircle of fixed cover; Marking closely nut sleeve loads on the female construction section of oncomelania; The dead in line of spinning roller mandrel, spinning roller and trim ring;
Spinning roller is the double tapered roller that power spinning of tube workpiece is used;
The length of trim ring is 10～20 times of blank wall thickness, and the external diameter of trim ring is confirmed through formula (1):
d
p=d
r-2Δt-(0.2～0.4)t
0（1）
Wherein, d
pBe trim ring external diameter, d
rBe the spinning roller diameter, Δ t is a passage attenuate amount, t
0Initial wall thickness for the tubular blank.
There is stepped through hole at the end plate center of said fixed cover one end, and the aperture of fixed cover aperture cooperates with the diameter of the spinning roller construction section of spinning roller mandrel, lays felt collar in the fixed cover macropore; The external peripheral surface of the fixed cover other end has the radially flange of protrusion.
Assembling process of the present invention is following:
The first step: spinning roller is enclosed within on the spinning roller construction section of spinning roller mandrel, and the positioning boss of its end face that links to each other with the positioning boss of spinning roller mandrel and spinning roller mandrel is fitted, with bolt the positioning boss of spinning roller with the spinning roller mandrel connected then.
Second step: trim ring is enclosed within on the trim ring construction section of spinning roller mandrel, the fixed cover that will have felt collar then is embedded within the trim ring, on the spinning roller construction section of spinning roller mandrel, and the corresponding end face of trim ring end face with threaded hole and fixed cover is fitted felt sleeve.
The 3rd step a: angular contact bearing is enclosed within on the trim ring construction section of spinning roller mandrel and the shaft shoulder of the inner ring end face that makes it and third and fourth grade axle formation of spinning roller mandrel fits, its cycle surface is fitted with the corresponding end face of fixed cover.And then successively sleeve and another angular contact bearing are enclosed within on the trim ring construction section of spinning roller mandrel sleeve is placed between the inner ring end face of a pair of angular contact bearing.
The 4th step: two locknuts are screwed on the screw thread of level V axle of spinning roller mandrel, and make it fasten the inner ring of angular contact bearing.
The 5th step: bearing (ball) cover is installed, the cycle surface of its vertical wall section end face and bearing is fitted, the end face of flange section and the outer face of fixed cover fit.
The 6th step: the three is tightened together with the screwed hole of hex bolts through bearing (ball) cover, fixed cover and trim ring.
Trim ring in the device proposed by the invention can produce inside radial compression effect to the blank that heave in spinning roller the place ahead in spinning process; Thereby the outside Radial Flow of restriction spinning roller the place ahead material; Promote that material flows vertically in the process; Suppress the not hole enlargement of spinning district blank, make in the cylindrical member forming process distortion steadily, finally reach the effect that prevents that blank tail end horn mouth from producing latter stage at spinning.Because this trim ring is to be installed on the spinning roller mandrel through bearing,, so just help reducing the friction between blank and the trim ring under the drive of blank in addition, optimize contact condition so trim ring can rotate with respect to spinning roller and spinning roller mandrel independence and freedom.And, adopt the present invention only to need to guarantee the primary clearance between trim ring and the blank outer surface and make primary clearance to be (0.1～0.2) t through the trim ring of changing various outer diameter for different wall thickness reduction amounts
0, t
0Be the initial wall thickness of tubular blank, this primary clearance can prevent in spinning starting stage trim ring and blank outer surface unnecessary contact and the friction that produces.Final through the test discovery; When under certain identical process conditions, carrying out single pass spinning; Common cylindrical member forward spinning can make effective shaped segment length of spinning spare reach 1.5 times of blank original axial direction length; And adopt device proposed by the invention to carry out the effective shaped segment length of spinning spare that cylindrical member forward spinning can reach is 2 times of blank original axial direction length; Prove that thus device proposed by the invention finally can reach the inhibition horn mouth and produce, increase effective shaped segment of spinning spare, improve the purpose of stock utilization.
Description of drawings
Fig. 1 is the horn mouth defective sketch map of cylindrical member spinning generation in latter stage;
Fig. 2 is a structural representation of the present invention;
Fig. 3 is the structural representation of spinning roller mandrel, and wherein, Fig. 3 a is a front view, and Fig. 3 b is a left view;
Fig. 4 is the structural representation of spinning roller, and wherein, Fig. 4 a is a front view, and Fig. 4 b is a left view;
Fig. 5 is the structural representation of trim ring, and wherein, Fig. 5 a is a front view, and Fig. 5 b is a left view;
Fig. 6 is the structural representation of bearing (ball) cover, and wherein, Fig. 6 a is a front view, and Fig. 6 b is a left view;
Fig. 7 is the structural representation of fixed cover, and wherein, Fig. 7 a is a front view, and Fig. 7 b is a left view.Among the figure:
1. bearing (ball) cover 2. locknuts 3. hex screws 4. fixed covers 5. trim rings 6. angular contact bearings
7. sleeve 8. spinning roller mandrels 9. spinning rollers 10. felt collars 11. rotary wheel bases cooperate section
12. positioning boss 13. spinning roller construction sections 14. trim ring construction sections 15. locknut construction sections
The specific embodiment
Present embodiment is a kind of cylindrical member forward spinning machine that is used for.The blank of this cylindrical member is the LF21M aluminium alloy pipe, and its external diameter is 106mm, and internal diameter is 100mm, and tube wall thickness is 3mm, and its axial length is 500mm.In the spinning process of this case study on implementation, the wall thickness reduction amount of blank is 1.2mm.
The bell-mouthed mechanism of the used inhibition aluminium alloy of present embodiment cylindrical member forward spinning tail end comprises spinning roller mandrel 8, spinning roller 9, trim ring 5, fixed cover 4, sleeve 7, a pair of angular contact bearing 6 and bearing (ball) cover 1.
Spinning roller mandrel 8 is the Pyatyi multidiameter.One end of this spinning roller mandrel 8 is for marking closely nut construction section 15, and this marks closely nut construction section 15 has external screw thread.The other end of this spinning roller mandrel 8 is that the rotary wheel base that is connected with the rotary wheel base of spinning machine of this spinning roller mandrel 2 cooperates section 11, and the internal diameter of installing hole is identical on the external diameter that this rotary wheel base cooperates section 11 and the rotary wheel base.Marking closely nut construction section 15 inboards are trim ring construction sections 14.Between trim ring construction section 14 and the rotary wheel base section of cooperation 11 is spinning roller construction section 13, and this spinning roller construction section 13 has the radially positioning boss 12 of protrusion with the rotary wheel base section of cooperation 11 adjoiners.Spinning roller 9 is sleeved on the spinning roller construction section 13 of spinning roller mandrel 8, and is fixed on the end face of positioning boss 12 through screw.A pair of angular contact bearing 6 is sleeved on the trim ring construction section 14; Fixed cover 4 is sleeved on the excircle of said a pair of angular contact bearing 6; Trim ring 5 is sleeved on the excircle of fixed cover 4.Marking closely nut 2 suits marks closely on the nut construction section 15.Bearing (ball) cover 1 is positioned at spinning roller mandrel 8 has the end of marking closely nut 2 one ends, and is connected through screw 3 and fixed cover 4 and trim ring 5.
Spinning roller mandrel 8, spinning roller 9 and trim ring 5 are the hollow revolving body, and the dead in line of spinning roller mandrel 8, spinning roller 9 and trim ring 5.Said spinning roller mandrel 8, spinning roller 9 and trim ring 5 are together axially done feed motion along core under the effect of rotary wheel base feed mechanism.Wherein spinning roller mandrel 8 synchronously rotates with spinning roller 9, and trim ring 5 is done independently and freely rotated.
The rotary wheel base of spinning roller mandrel cooperates section 11 to match with the rotary wheel base installing hole of spinning machine.Spinning roller 9 is installed on the spinning roller construction section 13 of spinning roller mandrel, and fits with the end face of the positioning boss 12 of spinning roller mandrel.Trim ring 5 is assembled on the trim ring construction section 14 of spinning roller mandrel through fixed cover 4, angular contact bearing 6 and sleeve 7.Described spinning roller mandrel 8 is the Pyatyi multidiameter, has formed rotary wheel base respectively and has cooperated section 11, positioning boss 12, spinning roller construction section 13, trim ring construction section 14 and mark closely nut construction section 15.Wherein, rotary wheel base cooperates the diameter of section 11 to match with the rotary wheel base installing hole of spinning machine, and is installed on the rotary wheel base through self-aligning roller bearing.The axial length of positioning boss 12 is 21mm; Diameter is 72mm; Fit with the shaft shoulder of spinning roller construction section 13 formation and an end face of spinning roller 9; Form spinning roller 9 along the axial installing and locating face of mandrel, and on the end face of this positioning boss 12, have 6 and be the countersunk head screwed hole of 10mm deeply, be used for spinning roller 9 and this positioning boss 12 affixed.The diameter of the spinning roller construction section 13 of spinning roller mandrel is identical with the diameter of spinning roller 9 centre bores; Be used for cooperating with the installing hole of spinning roller 9; The length of spinning roller construction section 13 is 33.5mm; Be slightly larger than the axial width of spinning roller 9, and spinning roller construction section 13 near an end of trim ring construction section 14 on cover be useful on the felt collar 10 of sealed rolling bearing 6.The diameter of the trim ring construction section 14 of spinning roller mandrel is slightly less than the diameter of spinning roller construction section 13; And it is that the ladder of 2～2.5mm is poor that the outer round surface of the outer round surface of described trim ring construction section 14 and spinning roller construction section 13 forms height, and the end face of this ladder has formed the location shaft shoulder of orientation angle contact bearing 6.The diameter of trim ring construction section 14 also should identically with the internal diameter of angular contact bearing 6 be used for matching with the inner surface of angular contact bearing 6, and the axial length of trim ring construction section 14 is identical with the axial length of fixed cover 4 direct tube sections.The diameter of marking closely nut construction section 15 of spinning roller mandrel is the diameter that 35mm is slightly less than trim ring construction section 14; The length of marking closely nut construction section 15 is 18mm, is slightly larger than the twice of locknut 2 axial lengths; Said nut construction section 15 surfaces of marking closely have external screw thread.
The double tapered roller that spinning roller 9 is used for power spinning of tube workpiece, its diameter are 103mm, and forming angle α is 25 °, and radius of corner is 3mm, and axial width is 25mm.
Spinning roller 9 is sleeved on the spinning roller construction section 13 through the installing hole at its center.On the circumference of said spinning roller 9 end faces, evenly the distribute countersunk head screwed hole of six perforations is used for spinning roller 9 is fixed on the positioning boss 12 of spinning roller mandrel.
Angular contact bearing 6 is used to realize the independent rotation of spinning roller mandrel 8 and trim ring 5, and can bear certain radial load and axial load.The internal diameter of a pair of angular contact bearing 6 is 40mm, and its inner surface cooperates with the trim ring construction section 14 of spinning roller mandrel.The external diameter of a pair of angular contact bearing 6 is 68mm, and its outer surface cooperates with the internal diameter of fixed cover 4.The axial width of single angular contact bearing 6 is 15mm.The inner ring end face of said a pair of angular contact bearing 6 is realized the axial restraint of angular contact bearing 6 inner rings through fitting with the end face of sleeve 7, the location shaft shoulder and locknut 2.End face through fixed cover 4 and bearing (ball) cover 1 is connected the axial restraint of realizing bearing (ball) cover 1, fixed cover 4, trim ring 5 and angular contact bearing outer ring with the applying of the cycle surface of angular contact bearing 6 and the bolt of bearing (ball) cover 1, fixed cover 4 and 5 of trim rings.
Fixed cover 4 is used for the axial restraint of 5 one directions of trim ring, also is used for sealed rolling bearing 6 simultaneously.Said fixed cover 4 is a cylindrical member.There is the stepped through hole of perforation at the end plate center of these fixed cover 4 one ends.The inner surface of this installing hole is stepped.The small-bore of said stepped through hole is 44.5mm, cooperates with the diameter of the spinning roller construction section 13 of spinning roller mandrel.The place, large aperture of said stepped through hole is used to lay felt collar 10.The other end of this fixed cover 4 is an opening end, at the external peripheral surface of this opening end the radially flange of protrusion is arranged, and is distributed with the tapped through hole that is connected with trim ring 5 with the flange of bearing (ball) cover 1 on the flange.
The external diameter of fixed cover 4 is 78mm, fits with the inner surface of trim ring 5.The internal diameter of fixed cover 4 is 68mm, matches with the outer surface of angular contact bearing 6.The direct tube section length of fixed cover 4 is 51mm, is about the length of trim ring 5.The bottom shaft section of fixed cover 4 is three grades of stairsteppings.Bottom installing hole through fixed cover 4 is sleeved on fixed cover 4 on the spinning roller construction section 13 of spinning roller mandrel; And at the intermediate step place of fixed cover 4 cover is useful on the felt collar 10 of sealed rolling bearing 6; The interior base frame rank end face of fixed cover 4 and the end face of angular contact bearing 6 outer rings are fitted, and are used for the axial location of angular contact bearing 6 one ends.
d
p=d
r-2Δt-(0.2～0.4)t
0（1）
Wherein, d
pBe trim ring external diameter, d
rBe the spinning roller diameter, Δ t is a passage attenuate amount, t
0Initial wall thickness for the tubular blank.
In the present embodiment, d
p=99.7mm.
Bearing (ball) cover 1 is band bottomless drum shape spare, and at its barrel middle part one flange is arranged.On this flange, be evenly equipped with the through hole that is connected with trim ring 5 with fixed cover 4.The axial restraint that bearing (ball) cover 1 is used for trim ring 5 also is used for sealed rolling bearing 6 simultaneously.The end face of the end face of bearing (ball) cover 1 and angular contact bearing 6 outer rings fits.The height of bearing (ball) cover 1 is 23mm, and the length of marking closely nut construction section 15 greater than the spinning roller mandrel makes it will mark closely nut construction section 15 and is closed in the mechanism.
The assembling process of present embodiment is following:
The first step: spinning roller 9 is enclosed within on the spinning roller construction section 13 of spinning roller mandrel, and the positioning boss 12 of its end face that links to each other with the positioning boss 12 of spinning roller mandrel and spinning roller mandrel is fitted, with bolt spinning roller 9 is connected with the positioning boss 12 of spinning roller mandrel then.
Second step: trim ring 5 is enclosed within on the trim ring construction section 14 of spinning roller mandrel; The fixed cover 4 that will have felt collar 10 then is embedded within the trim ring 5; On the spinning roller construction section 13 of spinning roller mandrel, and trim ring 5 end face with threaded hole and the corresponding end face of fixed cover 4 are fitted felt sleeve.
The 3rd step: an angular contact bearing 6 is enclosed within on the trim ring construction section 14 of spinning roller mandrel and the inner ring end face that makes it and spinning roller mandrel the 3 13, the shaft shoulder of level Four axle 14 formation fits, and its cycle surface is fitted with the corresponding end face of fixed cover 4.And then successively sleeve 7 and another angular contact bearing 6 are enclosed within on the trim ring construction section 14 of spinning roller mandrel sleeve 7 is placed between the inner ring end face of a pair of angular contact bearing 6.
The 4th step: two locknuts 2 are screwed on the screw thread of marking closely nut construction section 15 of spinning roller mandrel, and make it fasten the inner ring of angular contact bearing 6.
The 5th step: bearing (ball) cover 1 is installed, the cycle surface of its vertical wall section end face and bearing 6 is fitted, the outer face of the end face of flange section and fixed cover 4 fits.
The 6th step: the three is tightened together with the screwed hole of hex bolts 3 through bearing (ball) cover 1, fixed cover 4 and trim ring 5.
Claims (2)
1. a mechanism that is used for cylindrical member forward spinning is characterized in that, comprises spinning roller mandrel, spinning roller, trim ring, fixed cover, sleeve, a pair of angular contact bearing and bearing (ball) cover; Wherein:
A. described spinning roller mandrel is the Pyatyi multidiameter, has formed rotary wheel base respectively and has cooperated section, positioning boss, spinning roller construction section, trim ring construction section and mark closely the nut construction section; Mark closely the end that the nut construction section is positioned at the spinning roller mandrel, rotary wheel base cooperates section to be positioned at the other end of spinning roller mandrel; The trim ring construction section is positioned at marks closely nut construction section inboard; The spinning roller construction section is between trim ring construction section and the rotary wheel base section of cooperation, and this spinning roller construction section has the radially positioning boss of protrusion with the rotary wheel base section of cooperation adjoiner;
B. the rotary wheel base of spinning machine is sleeved on the rotary wheel base cooperation section of spinning roller mandrel; Spinning roller is installed on the spinning roller construction section of spinning roller mandrel, and is fixed on the end face of positioning boss of spinning roller mandrel; Fixed cover is sleeved on the trim ring construction section through a pair of angular contact bearing, and trim ring is sleeved on the excircle of fixed cover; Marking closely nut sleeve loads on the female construction section of oncomelania; The dead in line of spinning roller mandrel, spinning roller and trim ring;
C. the length of trim ring is 10～20 times of blank wall thickness, and the external diameter of trim ring is confirmed through formula (1):
d
p=d
r-2Δt-(0.2～0.4)t
0（1）
Wherein, d
pBe trim ring external diameter, d
rBe the spinning roller diameter, Δ t is a passage attenuate amount, t
0Initial wall thickness for the tubular blank.
2. a kind of according to claim 1 mechanism that is used for cylindrical member forward spinning; It is characterized in that; There is stepped through hole at the end plate center of fixed cover one end, and the aperture of fixed cover aperture cooperates with the diameter of the spinning roller construction section of spinning roller mandrel, lays felt collar in the fixed cover macropore; The external peripheral surface of the fixed cover other end has the radially flange of protrusion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210144751.1A CN102688927B (en) | 2012-05-11 | 2012-05-11 | Forward spinning mechanism for cylindrical member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210144751.1A CN102688927B (en) | 2012-05-11 | 2012-05-11 | Forward spinning mechanism for cylindrical member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102688927A true CN102688927A (en) | 2012-09-26 |
| CN102688927B CN102688927B (en) | 2014-06-18 |
Family
ID=46854757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210144751.1A Active CN102688927B (en) | 2012-05-11 | 2012-05-11 | Forward spinning mechanism for cylindrical member |
Country Status (1)
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|---|---|
| CN (1) | CN102688927B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103157716A (en) * | 2013-04-07 | 2013-06-19 | 吉林大学 | Spinning and forming device of cylindrical part with inner strengthening and outer thinning |
| CN103331369A (en) * | 2013-06-13 | 2013-10-02 | 成都中电锦江信息产业有限公司 | Shell-type knurl wheel for channelling machine |
| CN112733250A (en) * | 2020-12-20 | 2021-04-30 | 西安航天动力机械有限公司 | Method for determining thinning amount of inner and outer spinning wheels in spinning of cylindrical part |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103157716A (en) * | 2013-04-07 | 2013-06-19 | 吉林大学 | Spinning and forming device of cylindrical part with inner strengthening and outer thinning |
| CN103331369A (en) * | 2013-06-13 | 2013-10-02 | 成都中电锦江信息产业有限公司 | Shell-type knurl wheel for channelling machine |
| CN103331369B (en) * | 2013-06-13 | 2015-04-29 | 成都中电锦江信息产业有限公司 | Shell-type knurl wheel for channelling machine |
| CN112733250A (en) * | 2020-12-20 | 2021-04-30 | 西安航天动力机械有限公司 | Method for determining thinning amount of inner and outer spinning wheels in spinning of cylindrical part |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102688927B (en) | 2014-06-18 |
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