CN101722186A - Self-potential roller-type cross wedge rolling mill - Google Patents
Self-potential roller-type cross wedge rolling mill Download PDFInfo
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- CN101722186A CN101722186A CN200910154946A CN200910154946A CN101722186A CN 101722186 A CN101722186 A CN 101722186A CN 200910154946 A CN200910154946 A CN 200910154946A CN 200910154946 A CN200910154946 A CN 200910154946A CN 101722186 A CN101722186 A CN 101722186A
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Abstract
The invention discloses a self-potential roll-type cross wedge rolling mill, comprising a rack, an upper roll, a lower roll and a driving device used for driving the upper roll to move up and down. Upper bearing blocks are arranged at the two ends of the upper roll and lower bearing blocks are arranged at the two ends of the lower roll. Prestressed supports are fixedly arranged at the upper ends of the lower bearing blocks. Adjusting levers are connected on the prestressed supports by bolts. The cross wedge rolling mill is characterized in that a first self-potential adjusting device is arranged between the lower ends of the lower bearing blocks and the rack; a second self-potential adjusting device is arranged between the adjusting levers and the lower end faces of the upper bearing blocks; a third self-potential adjusting device is arranged between the upper end faces of the upper bearing blocks and the driving device; and axial self-potential adjusting devices with the same structure are arranged between the sides, positioned at the operating sides, of the upper bearing blocks and the rack as well as between the sides, positioned at the operating sides, of the lower bearing blocks and the rack. The invention has the following advantages: the bearing load is uniform when the rolling mill works, the design life of the bearing is ensured, the inner organizations of the rolled pieces are uniform, the rolling precision and the product quality are improved and scale production of the shaft parts by cross wedge rolling is realized.
Description
Technical field
The present invention relates to a kind of plastic forming equipment of axial workpiece, relate in particular to a kind of self-potential roller-type cross wedge rolling mill.
Background technology
Cross wedge rolling is a kind of New Forming Process of axial workpiece, has advantages such as efficient, material-saving, has at home and abroad obtained using more widely.And along with the continuous development of cross wedge rolling technology, but the scope of its rolled products is also more and more big, and can rolling automobile axle shaft and railway vehicle axle etc. as adopting the Multi-wedge Cross Wedge Rolling simultaneous techniques.But because the roll barrel that longaxones parts such as rolling automobile axle shaft need is longer, the roll system strain of cross wedge rolling machine is bigger in the operation of rolling, the bearing load unbalance loading that causes milling train, bearing life is far below projected life, but also can cause rolled piece discontinuity in the operation of rolling, make rolled piece interior tissue and distortion inhomogeneous, thereby produce defectives such as rolled piece is loose.Therefore, present cross wedge rolling machine both domestic and external is difficult to satisfy the axial workpiece that longaxones parts or rolls many and carries out the rolling large-scale production of cross wedge rolling.
Summary of the invention
Technical problem to be solved by this invention provides a kind of when rolling axial workpiece; can guarantee bearing load evenly, the rolled piece interior tissue is even, realizes that longaxones parts or rolls the self-potential roller-type cross wedge rolling mill that many axial workpiece carries out the rolling large-scale production of cross wedge rolling.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of self-potential roller-type cross wedge rolling mill, comprise frame, topping roll, bottom roll and be used to drive the drive unit that described topping roll moves up and down, the two ends of described topping roll are provided with top chock, the two ends of described bottom roll are provided with step, the upper end of described step is set with the prestressing force bearing, be bolted with adjusting rod on the described prestressing force bearing, be provided with the first self-alignment adjusting device between the lower end of described step and the described frame, be provided with the second self-alignment adjusting device between the lower surface of described adjusting rod and described top chock, be provided with the 3rd self-alignment adjusting device between the upper surface of described top chock and the described drive unit, wherein be positioned at the side of the top chock of fore side, the side of step all with between the described frame is provided with the identical axial self-alignment adjusting device of structure.
The described first self-alignment adjusting device comprises first attachment screw and the last convex globoidal piece that superposes and place successively from bottom to up, concave-concave cambered surface piece and following convex globoidal piece, described upward convex globoidal piece and the described cambered surface of convex globoidal piece down match with the cambered surface of described concave-concave cambered surface piece respectively, described convex globoidal piece down is supported on the lower surface of described step, the described convex globoidal piece of going up is placed on the described frame, described first attachment screw passes described convex globoidal piece down successively with the fit system of matched in clearance, concave-concave cambered surface piece and last convex globoidal piece, the described center of circle of convex globoidal piece down and the axle center of described bottom roll coincide.
Described axial self-alignment adjusting device comprises
The axial self-alignment piece of type and the baffle plate that is fixedly installed on the described frame, the both sides of described step are wholely set the straight pin concentric with the axle center of described bottom roll, the plane of structure of described axial self-alignment piece is provided with circular hole, described straight pin and described circular hole matched in clearance, the vertical face of described axial self-alignment piece is plugged between described baffle plate and the described frame.
Be provided with copper shoe between the plane of structure of described axial self-alignment piece and the described frame, described copper shoe is fixedly connected on the described axial self-alignment piece, makes axial self-alignment piece rub resistance, does not need frequent replacing.
The described second self-alignment adjusting device comprises second attachment screw, first time protruding sphere piece, the locating piece of the first concave-concave sphere piece and band convex edge, the upper end of described adjusting rod has been wholely set the first epirelief sphere piece, the described first concave-concave sphere piece is arranged between the described first epirelief sphere piece and the described first time protruding sphere piece, the sphere of the described first epirelief sphere piece and described first time protruding sphere piece matches with the sphere of the described first concave-concave sphere piece respectively, the convex edge of described locating piece is connected on the axle journal between described first epirelief sphere piece and the described adjusting rod, described locating piece is fixedlyed connected by described second attachment screw with described first time protruding sphere piece, the described first epirelief sphere piece, be provided with the gap between described first concave-concave sphere piece and the described locating piece, described first time protruding sphere piece is supported on the lower surface of described top chock.
Described drive unit is arranged on the top of described top chock, described drive unit comprises worm gear, worm screw, screw mandrel and is fixedly installed on drive motors on the described housiung separator, described worm screw is fixedlyed connected with the output shaft of described drive motors, described worm gear is meshed with described worm screw, described screw mandrel is fixedlyed connected with described worm gear is coaxial, be set with transmission nut in the described frame, described screw mandrel and described transmission nut are spirally connected.
Described the 3rd self-alignment adjusting device comprises gland, snap ring and the second epirelief sphere piece that is arranged in the described gland, the second concave-concave sphere piece, described gland is fixedly connected on the upper surface of described top chock, the described second epirelief sphere piece is pressed on the upper surface of described top chock, the lower end of described screw mandrel has been wholely set protruding sphere piece second time, the described second concave-concave sphere piece is arranged between the described second epirelief sphere piece and the described second time protruding sphere piece, the sphere of the described second epirelief sphere piece and described second time protruding sphere piece matches with the sphere of the described second concave-concave sphere piece respectively, described snap ring is connected on the axle journal between described second time protruding sphere piece and the described screw mandrel, described snap ring is fixedly connected on the upper surface of described gland, the described second epirelief sphere piece, the described second concave-concave sphere piece, be provided with the gap between described second time protruding sphere piece and the described gland, the centre of sphere of the described second epirelief sphere piece and the axle center of described topping roll coincide.
Be connected easy disassembly by dovetail groove between the upper end of described prestressing force bearing and described step.
The self-alignment principle of milling train is when upper and lower roll is subjected to the roll-force effect and produces the elastic bending deflection deformation among the present invention, and upper and lower bearing block is followed the inclination of roller curve and wallowing motion; And when upper and lower roll unloads, recover to make roller curve revert to horizontal line by the elasticity of roll, upper and lower bearing block is followed and is set back.
Compared with prior art; advantage of the present invention is to make milling train possess the self-alignment regulatory function by the self-alignment adjusting device is set on milling train; thereby bearing load is even when having guaranteed milling train work; guaranteed the projected life of bearing; and the rolled piece interior tissue that rolls out is even; improve rolling precision and product quality, realized the rolling large-scale production of cross wedge rolling that longaxones parts or rolls many axial workpieces.
Description of drawings
Fig. 1 is the leverage sketch of the present invention under Light Condition;
Fig. 2 is the leverage sketch of the present invention under as-rolled condition;
Fig. 3 is a front view of the present invention;
Fig. 4 is a side view of the present invention;
Fig. 5 is the structural representation of drive unit of the present invention;
Fig. 6 is the front view of the upper and lower roll system of the present invention;
Fig. 7 is the side view of the upper and lower roll system of the present invention;
Fig. 8 is the vertical view of bottom roll of the present invention system;
Fig. 9 is the enlarged diagram at A place among Fig. 7;
Figure 10 is the B-B cutaway view among Fig. 8.
The specific embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
As shown in the figure, a kind of self-potential roller-type cross wedge rolling mill, comprise frame 1, topping roll 3, bottom roll 2 and be used to drive the drive unit that topping roll 3 moves up and down, the two ends of topping roll 3 are provided with top chock 31, the two ends of bottom roll 2 are provided with step 5, be provided with the first self-alignment adjusting device between the lower end of step 5 and the frame 1, the first self-alignment adjusting device comprises first attachment screw 11 and the last convex globoidal piece 12 that superposes and place successively from bottom to up, concave-concave cambered surface piece 13 and following convex globoidal piece 14, the cambered surface of last convex globoidal piece 12 and following convex globoidal piece 14 matches with the cambered surface of concave-concave cambered surface piece 13 respectively, following convex globoidal piece 14 is supported on the lower surface of step 5, last convex globoidal piece 12 is placed on the frame 1, first attachment screw 11 passes down convex globoidal piece 14 successively with the fit system of matched in clearance, concave-concave cambered surface piece 13 and last convex globoidal piece 12, the axle center of the center of circle of following convex globoidal piece 14 and bottom roll 2 coincides, the upper end of step 5 is fixedly connected with prestressing force bearing 6 by dovetail groove, be bolted with adjusting rod 7 on the prestressing force bearing 6, be provided with the second self-alignment adjusting device between adjusting rod 7 and the top chock 31, the second self-alignment adjusting device comprises second attachment screw 15, first time protruding sphere piece 16, the locating piece 18 of the first concave-concave sphere piece 17 and band convex edge, the upper end of adjusting rod 7 has been wholely set the first epirelief sphere piece 71, the first concave-concave sphere piece 17 is arranged between the first epirelief sphere piece 71 and the first time protruding sphere piece 16, the sphere of the first epirelief sphere piece 71 and first time protruding sphere piece 16 matches with the sphere of the first concave-concave sphere piece 17 respectively, the convex edge of locating piece 18 is connected on the axle journal between the first epirelief sphere piece 71 and the adjusting rod 7, locating piece 18 is fixedlyed connected by second attachment screw 15 with first time protruding sphere piece 16, the first epirelief sphere piece 71, be provided with the gap between the first concave-concave sphere piece 17 and the locating piece 18, first time protruding sphere piece 16 is supported on the lower surface of top chock 3, wherein be positioned at the side of the top chock 31 of fore side, the side of step 5 all with between the frame 1 is provided with the identical axial self-alignment adjusting device of structure, and axially the self-alignment adjusting device comprises copper shoe 10;
The axial self-alignment piece 8 of type and the baffle plate 9 that is fixedly installed on the frame 1, the both sides of step 5 are wholely set the straight pin 51 concentric with the axle center of bottom roll 2, axially the plane of structure of self-alignment piece 8 is provided with circular hole 81, straight pin 51 and circular hole 81 matched in clearance, copper shoe 10 is fixedly connected on the axial self-alignment piece 8 and is arranged between the plane of structure and frame 1 of axial self-alignment piece 8, axially the vertical face of self-alignment piece 8 is plugged between baffle plate 9 and the frame 1, drive unit is arranged on the top of top chock 31, drive unit comprises worm gear 23, worm screw 22, screw mandrel 24 and the drive motors 21 that is fixedly installed on the housiung separator 100, worm screw 22 is fixedlyed connected with the output shaft of drive motors 21, worm gear 23 is meshed with worm screw 22, screw mandrel 24 and worm gear 23 coaxial fixedlying connected, be set with transmission nut 25 in the frame 1, screw mandrel 24 is spirally connected with transmission nut 25, be provided with the 3rd self-alignment adjusting device between the upper surface of top chock 31 and the screw mandrel 24, the 3rd self-alignment adjusting device comprises gland 26, snap ring 27 and the second epirelief sphere piece 28 that is arranged in the gland 26, the second concave-concave sphere piece 29, gland 26 is fixedly connected on the upper surface of top chock 31 by screw, the second epirelief sphere piece 28 is pressed on the upper surface of top chock 31, the lower end of screw mandrel 24 has been wholely set protruding sphere piece 241 second time, the second concave-concave sphere piece 29 is arranged between the second epirelief sphere piece 28 and the second time protruding sphere piece 241, the sphere of the second epirelief sphere piece 28 and second time protruding sphere piece 241 matches with the sphere of the second concave-concave sphere piece 29 respectively, snap ring 27 is connected on the axle journal between second time protruding sphere piece 241 and the screw mandrel 24, snap ring 27 is fixedly connected on the upper surface of gland 26 by screw, the second epirelief sphere piece 28, the second concave-concave sphere piece 29, be provided with the gap between second time protruding sphere piece 241 and the gland 26, the centre of sphere of the second epirelief sphere piece 28 and the axle center of topping roll 3 coincide.
Design considerations of the present invention is: upper and lower roll system of the present invention is reduced to leverage mechanism shown in Figure 1, the leverage mechanism of upper and lower roll system constitutes by last self-alignment rod member I, following self-alignment rod member II and axial restraint self-alignment rod member III three parts, it is six bars, eight hinges, one sliding secondary mechanisms, under no-load condition, its free degree is: F=3 * 6-2 * 9=0, therefore, this leverage mechanism is that static determinacy is stable.And under as-rolled condition,, obtain roll system leverage mechanism shown in Figure 2 according to heavy mechanism leverage characteristic and elastic theory, it is seven bars, nine hinges, one sliding secondary mechanisms, its free degree is: F=3 * 7-2 * 10=1, have one degree of freedom, and can realize from bit motion.
In the foregoing description, last convex globoidal piece 12, the self-alignment rod member II that concave-concave cambered surface piece 13 and following convex globoidal piece 14 constitute in the leverage mechanism of bottom roll system, realize from bit function by cambered surface, first time protruding sphere piece 16, the self-alignment rod member I that the first epirelief sphere piece 71 on the first concave-concave sphere piece 17 and the adjusting rod 7 constitutes in the leverage mechanism of bottom roll system, realize from bit function by sphere, and the self-alignment rod member III that axial self-alignment piece 8 and step 5 constitute in the leverage mechanisms of bottom roll system, by realizing cooperating of the circular hole 81 in straight pin on the step 5 51 and the axial self-alignment piece 8 axially from bit function; The second epirelief sphere piece 28, the self-alignment rod member II that the protruding sphere piece 241 of the second concave-concave sphere piece 29 and second time constitutes in the leverage mechanisms of topping roll system, realize from bit function by sphere, first time protruding sphere piece 16, the self-alignment rod member I that the first epirelief sphere piece 71 on the first concave-concave sphere piece 17 and the adjusting rod 7 constitutes in the leverage mechanism of topping roll system, realize from bit function by sphere, the structure of self-alignment rod member III in the structure of self-alignment rod member III in the leverage mechanism of topping roll system and the leverage mechanism of bottom roll system is identical, therefore, milling train of the present invention has the self-alignment regulatory function.
Claims (8)
1. self-potential roller-type cross wedge rolling mill, comprise frame, topping roll, bottom roll and be used to drive the drive unit that described topping roll moves up and down, the two ends of described topping roll are provided with top chock, the two ends of described bottom roll are provided with step, the upper end of described step is set with the prestressing force bearing, be bolted with adjusting rod on the described prestressing force bearing, it is characterized in that being provided with the first self-alignment adjusting device between the lower end of described step and the described frame, be provided with the second self-alignment adjusting device between the lower surface of described adjusting rod and described top chock, be provided with the 3rd self-alignment adjusting device between the upper surface of described top chock and the described drive unit, wherein be positioned at the side of the top chock of fore side, the side of step all with between the described frame is provided with the identical axial self-alignment adjusting device of structure.
2. a kind of self-potential roller-type cross wedge rolling mill as claimed in claim 1, it is characterized in that the described first self-alignment adjusting device comprises first attachment screw and the last convex globoidal piece that superposes and place successively from bottom to up, concave-concave cambered surface piece and following convex globoidal piece, described upward convex globoidal piece and the described cambered surface of convex globoidal piece down match with the cambered surface of described concave-concave cambered surface piece respectively, described convex globoidal piece down is supported on the lower surface of described step, the described convex globoidal piece of going up is placed on the described frame, described first attachment screw passes described convex globoidal piece down successively with the fit system of matched in clearance, concave-concave cambered surface piece and last convex globoidal piece, the described center of circle of convex globoidal piece down and the axle center of described bottom roll coincide.
3. a kind of self-potential roller-type cross wedge rolling mill as claimed in claim 2, levy be described axial self-alignment adjusting device comprise "
" type axial self-alignment piece and be fixedly installed on baffle plate on the described frame; the both sides of described step are wholely set the straight pin concentric with the axle center of described bottom roll; the plane of structure of described axial self-alignment piece is provided with circular hole; described straight pin and described circular hole matched in clearance, the vertical face of described axial self-alignment piece is plugged between described baffle plate and the described frame.
4. a kind of self-potential roller-type cross wedge rolling mill as claimed in claim 3 is characterized in that being provided with copper shoe between the plane of structure of described axial self-alignment piece and the described frame, and described copper shoe is fixedly connected on the described axial self-alignment piece.
5. a kind of self-potential roller-type cross wedge rolling mill as claimed in claim 1, it is characterized in that the described second self-alignment adjusting device comprises second attachment screw, first time protruding sphere piece, the locating piece of the first concave-concave sphere piece and band convex edge, the upper end of described adjusting rod has been wholely set the first epirelief sphere piece, the described first concave-concave sphere piece is arranged between the described first epirelief sphere piece and the described first time protruding sphere piece, the sphere of the described first epirelief sphere piece and described first time protruding sphere piece matches with the sphere of the described first concave-concave sphere piece respectively, the convex edge of described locating piece is connected on the axle journal between described first epirelief sphere piece and the described adjusting rod, described locating piece is fixedlyed connected by described second attachment screw with described first time protruding sphere piece, the described first epirelief sphere piece, be provided with the gap between described first concave-concave sphere piece and the described locating piece, described first time protruding sphere piece is supported on the lower surface of described top chock.
6. a kind of self-potential roller-type cross wedge rolling mill as claimed in claim 1, it is characterized in that described drive unit is arranged on the top of described top chock, described drive unit comprises worm gear, worm screw, screw mandrel and is fixedly installed on drive motors on the described housiung separator, described worm screw is fixedlyed connected with the output shaft of described drive motors, described worm gear is meshed with described worm screw, described screw mandrel is fixedlyed connected with described worm gear is coaxial, be set with transmission nut in the described frame, described screw mandrel and described transmission nut are spirally connected.
7. a kind of self-potential roller-type cross wedge rolling mill as claimed in claim 6, it is characterized in that described the 3rd self-alignment adjusting device comprises gland, snap ring and the second epirelief sphere piece that is arranged in the described gland, the second concave-concave sphere piece, described gland is fixedly connected on the upper surface of described top chock, the described second epirelief sphere piece is pressed on the upper surface of described top chock, the lower end of described screw mandrel has been wholely set protruding sphere piece second time, the described second concave-concave sphere piece is arranged between the described second epirelief sphere piece and the described second time protruding sphere piece, the sphere of the described second epirelief sphere piece and described second time protruding sphere piece matches with the sphere of the described second concave-concave sphere piece respectively, described snap ring is connected on the axle journal between described second time protruding sphere piece and the described screw mandrel, described snap ring is fixedly connected on the upper surface of described gland, the described second epirelief sphere piece, the described second concave-concave sphere piece, be provided with the gap between described second time protruding sphere piece and the described gland, the centre of sphere of the described second epirelief sphere piece and the axle center of described topping roll coincide.
8. a kind of self-potential roller-type cross wedge rolling mill as claimed in claim 1 is characterized in that being connected by dovetail groove between the upper end of described prestressing force bearing and described step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101549462A CN101722186B (en) | 2009-11-25 | 2009-11-25 | Self-potential roller-type cross wedge rolling mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101549462A CN101722186B (en) | 2009-11-25 | 2009-11-25 | Self-potential roller-type cross wedge rolling mill |
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| Publication Number | Publication Date |
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| CN101722186A true CN101722186A (en) | 2010-06-09 |
| CN101722186B CN101722186B (en) | 2012-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101549462A Expired - Fee Related CN101722186B (en) | 2009-11-25 | 2009-11-25 | Self-potential roller-type cross wedge rolling mill |
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| CN (1) | CN101722186B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494227A (en) * | 2011-12-14 | 2012-06-13 | 重庆大学 | Large-tonnage combined type adjustable prestress framework |
| CN102553927A (en) * | 2012-01-09 | 2012-07-11 | 宁波大学 | Roll-type cross wedge rolling mill with replaceable roll systems for railway axles |
| CN102601122A (en) * | 2012-03-13 | 2012-07-25 | 西安交通大学 | Alternating-current direct-drive servo device for main transmission and two-roller radial spacing adjustment |
| CN105014159A (en) * | 2015-07-15 | 2015-11-04 | 宁波大学 | Planetary gear train-plane screw type bar end hot molding mechanism |
| CN107089091A (en) * | 2017-04-24 | 2017-08-25 | 天津创新晶彩科技有限公司 | One kind can freely change stamp roller arrangement |
| CN107138659A (en) * | 2017-04-28 | 2017-09-08 | 燕山大学 | A kind of cross wedge rolling machine for being used to shape small shaft forgings |
| CN110744078A (en) * | 2019-09-29 | 2020-02-04 | 山西晋城无烟煤矿业集团有限责任公司 | Top thread reciprocating motion mechanism |
| CN112974541A (en) * | 2021-02-08 | 2021-06-18 | 太原科技大学 | Axial movement device of large axle wedge cross rolling mill for rail transit |
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2009
- 2009-11-25 CN CN2009101549462A patent/CN101722186B/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494227A (en) * | 2011-12-14 | 2012-06-13 | 重庆大学 | Large-tonnage combined type adjustable prestress framework |
| CN102553927A (en) * | 2012-01-09 | 2012-07-11 | 宁波大学 | Roll-type cross wedge rolling mill with replaceable roll systems for railway axles |
| CN102553927B (en) * | 2012-01-09 | 2014-11-05 | 宁波大学 | Roll-type cross wedge rolling mill with replaceable roll systems for railway axles |
| CN102601122A (en) * | 2012-03-13 | 2012-07-25 | 西安交通大学 | Alternating-current direct-drive servo device for main transmission and two-roller radial spacing adjustment |
| CN102601122B (en) * | 2012-03-13 | 2014-10-15 | 西安交通大学 | Alternating-current direct-drive servo device for main transmission and two-roller radial spacing adjustment |
| CN105014159A (en) * | 2015-07-15 | 2015-11-04 | 宁波大学 | Planetary gear train-plane screw type bar end hot molding mechanism |
| CN107089091A (en) * | 2017-04-24 | 2017-08-25 | 天津创新晶彩科技有限公司 | One kind can freely change stamp roller arrangement |
| CN107138659A (en) * | 2017-04-28 | 2017-09-08 | 燕山大学 | A kind of cross wedge rolling machine for being used to shape small shaft forgings |
| CN107138659B (en) * | 2017-04-28 | 2019-03-22 | 燕山大学 | It is a kind of for shaping the cross wedge rolling machine of small shaft forgings |
| CN110744078A (en) * | 2019-09-29 | 2020-02-04 | 山西晋城无烟煤矿业集团有限责任公司 | Top thread reciprocating motion mechanism |
| CN112974541A (en) * | 2021-02-08 | 2021-06-18 | 太原科技大学 | Axial movement device of large axle wedge cross rolling mill for rail transit |
| CN112974541B (en) * | 2021-02-08 | 2022-07-12 | 太原科技大学 | Axial movement device of large axle wedge cross rolling mill for rail transit |
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| CN101722186B (en) | 2012-01-25 |
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