CN101893036A - Multi-row ball type slewing bearing and machining method thereof - Google Patents
Multi-row ball type slewing bearing and machining method thereof Download PDFInfo
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- CN101893036A CN101893036A CN2010102166361A CN201010216636A CN101893036A CN 101893036 A CN101893036 A CN 101893036A CN 2010102166361 A CN2010102166361 A CN 2010102166361A CN 201010216636 A CN201010216636 A CN 201010216636A CN 101893036 A CN101893036 A CN 101893036A
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- raceway
- steel ball
- outer ring
- row
- inner ring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
- F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2300/00—Application independent of particular apparatuses
- F16C2300/10—Application independent of particular apparatuses related to size
- F16C2300/14—Large applications, e.g. bearings having an inner diameter exceeding 500 mm
Abstract
The invention discloses a multi-row ball type slewing bearing and a machining method thereof. The multi-row ball type slewing bearing comprises an outer ring 1, an inner ring 2 and steel balls 3 and is characterized in that the inner annular surface of the outer ring 1 is provided with at least three rows of inner raceways at intervals according to a certain size; the outer annular ring of the inner ring 2 is also provided with at least three rows of raceways which correspond to the inner raceways of the outer ring; the inner raceways and the outer raceways are in the same shape, and corresponding raceways form complete steel ball raceways; and the steel balls 3 are evenly distributed in each row of steel ball raceway and separated by insulating blocks 6 or solid retainers 7. The multi-row ball type slewing bearing has three or over three rows of bearing rollers, thereby having high bearing capacity. Meanwhile, because the slew bearing needs less materials due to compact structure, thereby having good economic performance. The multi-row ball type slewing bearing is suitable for working places requiring the slewing bearing with high bearing capacity and good rigidity and limited in mounting space of the slewing bearing.
Description
Technical field
The present invention relates to pivoting support, relate in particular to a kind of ball-type slewing bearing and processing method thereof.
Background technique
Pivoting support (also claiming turntable bearing) is the mechanical necessary important force transfer element that needs to do to turn round relatively, need to bear simultaneously again axial force, radial force, tilting moment between all two-part as the important foundation element of engineering machinery and building machinery.Except that be excavator, tower crane, mobile crane and all kinds of hoist supporting, also be widely used in light industry and machinery, harbour machinery, metallurgical machinery, medical machinery, industrial robot, rock tunnel(ling) machine, stacker-reclaimer, recreation equipment, missile launcher, radar antenna etc.Pivoting support can be divided into by its structural type: single-row ball type, three organ timbering formulas, decussation roller formula, double eight point contact ball formulas, goalpost combined type etc.Ball-type slewing bearing accounts for more than 90% of market at present.Along with all kinds of main frames are more and more compacter, particularly radially installing space is more and more littler for the installing space of pivoting support, adopt single-row ball type, the decussation roller formula, double eight point contact ball formulas, the goalpost combined type is prone to the not enough situation of bearing capacity, if improve the bearing capacity of this type of pivoting support, need to increase the axial of pivoting support, radial dimension, this and main frame are runed counter to the requirement of pivoting support, though three organ timbering formula pivoting support bearing capacitys are big, 2 meters relatively poor with three interior organ timbering formula pivoting support Economy, can't satisfy the demand of main frame to the pivoting support cost performance.
Summary of the invention
Problem to be solved by this invention provides a kind of multi-row ball type slewing bearing, makes under the less situation of the installing space of pivoting support, has high bearing capacity, better economic.The present invention also provides the processing method of this kind multi-row ball type slewing bearing.
Multi-row ball type slewing bearing of the present invention comprises outer ring 1, inner ring 2, steel ball 3, it is characterized in that: a, outer ring 1 and inner ring 2 are ring part, and inner ring 2 is assemblied in the interior annular distance of outer ring 1, and the last lower plane of inner ring 2 all is higher than the last lower plane of outer ring 1; Be higher than at inner ring 2 and have annular groove on the outer ring surface on plane on the outer ring 1 Stamping Steel Ribbon 4 is installed, be lower than in outer ring 1 and have down on the inner ring surface of inner ring 2 lower planes that annular groove is equipped with Stamping Steel Ribbon 4; In the outer ring 1 and the axial plane of inner ring 2 be equipped with mounting hole; On the inner ring surface of b, outer ring 1 according to certain size spaced apart be provided with at least three row in raceway; Also offer at least three exclusive raceways on the outer ring surface of inner ring 2, its position is corresponding with the interior raceway of outer ring; The shape of inside and outside raceway is identical, and corresponding inside and outside raceway has formed complete steel ball rolling channel; The uniform steel ball 3 that is placed with in every row's steel ball rolling channel adopts spacing block 6 or integral cage 7 to isolate between the steel ball 3; C, every row's steel ball rolling channel all communicate with a plugging hole, and the plugging hole aperture is equipped with in the hole and is stopped up 8 greater than the diameter of steel ball 3, stagger mutually in the plugging hole position of adjacent raceway; Every row's steel ball rolling channel all communicates with an oil duct, and oil duct is equipped with lubricating cup 5 away from an end of steel ball rolling channel.
This pivoting support can be divided into external tooth type, internal gear type and no tooth-like three kinds: the external tooth type pivoting support is that the outer ring surface in the outer ring adds external toothings such as work gear, worm gear or sprocket wheel; The internal gear type pivoting support is that the inner ring surface at inner ring adds ring gears such as work gear; The inside and outside circle that does not have tooth-like pivoting support does not all have gear ring.
Wherein the processing method of external tooth type, internal gear type multi-row ball type slewing bearing is:
A, adopt numerically controlled lathe that raceway is carried out semi finishing according to calculating resulting raceway parameter;
B, raceway quench and adopt mid-frequency induction hardening;
C, the pivoting support each several part is carried out fine finishing;
D, employing numerical control tooth working machine tool carry out gear ring processing;
E, employing numerical control drilling machine carry out axial mounting hole processing at inside and outside circle axial plane;
F, application numerical control raceway special purpose grinder or numerical control raceway special purpose lathe form processing to raceway.
The processing method of wherein not having tooth-like multi-row ball type slewing bearing is:
A, adopt numerically controlled lathe that raceway is carried out semi finishing according to calculating resulting raceway parameter;
B, raceway quench and adopt mid-frequency induction hardening;
C, the pivoting support each several part is carried out fine finishing;
D, employing numerical control drilling machine carry out axial mounting hole processing at inside and outside circle axial plane;
E, application numerical control raceway special purpose grinder or numerical control raceway special purpose lathe form processing to raceway.
Multi-row ball type slewing bearing of the present invention is owing to the rolling element of supporting is more than three rows and three arrange, so have high bearing capacity.Simultaneously, because its compact structure, required raw material are few, so better economy.Therefore the present invention is applicable to bearing capacity height, the good rigidly that all require pivoting support, to the conditional workplace of the installing space of pivoting support.
Description of drawings
Fig. 1 is the structural representation of multi-row ball type slewing bearing of the present invention;
Fig. 2 is that A place steel ball rolling channel is the enlarged diagram of peach shape raceway among Fig. 1;
Fig. 3 is that A place steel ball rolling channel is the enlarged diagram of elliptic roller track among Fig. 1;
Fig. 4 is the structural representation that the present invention adopts the multi-row ball type slewing bearing of taper pin locking obstruction;
Fig. 5 is the structural representation that the present invention adopts the multi-row ball type slewing bearing of Cock screw locking obstruction;
Fig. 6 is the schematic representation that adopts spacing block to isolate between the steel ball of multi-row ball type slewing bearing of the present invention;
Fig. 7 is the schematic representation that adopts integral cage to isolate between the steel ball of multi-row ball type slewing bearing of the present invention;
Fig. 8 is the sectional view along B-B line among Fig. 7.
Embodiment
Multi-row ball type slewing bearing of the present invention is meant that rolling element is three rows and the above pivoting support of three rows.It comprises outer ring 1, inner ring 2, steel ball 3, it is characterized in that: a, outer ring 1 and inner ring 2 are ring part, and inner ring 2 is assemblied in the interior annular distance of outer ring 1, and the last lower plane of inner ring 2 all is higher than the last lower plane of outer ring 1; Be higher than at inner ring 2 and have annular groove on the outer ring surface on plane on the outer ring 1 Stamping Steel Ribbon 4 is installed, be lower than in outer ring 1 and have down on the inner ring surface of inner ring 2 lower planes that annular groove is equipped with Stamping Steel Ribbon 4; In the outer ring 1 and the axial plane of inner ring 2 be equipped with mounting hole; On the inner ring surface of b, outer ring 1 according to certain size spaced apart be provided with at least three row in raceway; Also offer at least three exclusive raceways on the outer ring surface of inner ring 2, its position is corresponding with the interior raceway of outer ring; The shape of inside and outside raceway is identical, and corresponding inside and outside raceway has formed complete steel ball rolling channel; The uniform steel ball 3 that is placed with in every row's steel ball rolling channel adopts spacing block 6 or integral cage 7 to isolate between the steel ball 3; C, every row's steel ball rolling channel all communicate with a plugging hole, and the plugging hole aperture is equipped with in the hole and is stopped up 8 greater than the diameter of steel ball 3, stagger mutually in the plugging hole position of adjacent raceway; Every row's steel ball rolling channel all communicates with an oil duct, and oil duct is equipped with lubricating cup 5 away from an end of steel ball rolling channel.
Described plugging hole is a through hole, is opened on outer ring 1 anchor ring or inner ring 2 anchor rings along the radial direction that supports.When supporting is assembled, earlier its axial position is determined by steel ball rolling channel in outer ring 1 and inner ring 2, pack into successively from each plugging hole steel ball 3 and spacing block 6 are blocked each plugging hole with stopping up 8 then again, at last axially with taper pin 9 or radially stopping up with Cock screw 10 lockings.Described oil duct is a through hole, is opened on outer ring 1 anchor ring or inner ring 2 anchor rings along the radial direction that supports.Also can adopt integral cage 7 to isolate between the steel ball 3 in every row's steel ball rolling channel.The pattern of the mounting hole of described inside and outside circle axial plane has two kinds of through hole and tapped holes.During use, pivoting support is connected with main frame with bolt by mounting hole.
The structural type of the steel ball rolling channel of this pivoting support has following two kinds:
(1) peach shape raceway: be the two centers of circle of two circular arcs, raceway symmetry up and down, the ratio t of raceway radius of curvature R and steel ball radius of curvature r is 1.02～1.08, wrapping angle β value is 45 °～50 °.
(2) elliptic roller track: the major semi axis of raceway, semi-minor axis parameter calculate according to the radius of curvature and the wrapping angle of steel ball radius of curvature, raceway and steel ball point of contact.The major semi axis of elliptic roller track, semi-minor axis formula are as follows:
In the following formula: a---the major semi axis of elliptic roller track;
The semi-minor axis of b---elliptic roller track;
R---steel ball radius of curvature;
The ratio of the radius of curvature R of t---raceway and steel ball point of contact and steel ball radius of curvature r, R/r;
The wrapping angle of β---steel ball and raceway;
Ratio of curvature t span is: 1.01-1.12, wrapping angle β are 30 °-60 °.
For example: when the raceway parameter value of pivoting support is: in the time of the ratio t=1.0 of the raceway radius of curvature R of steel ball radius of curvature r=9.922mm, raceway and point of contact and steel ball radius of curvature r, wrapping angle β=50 °, can draw major semi axis a=10.412mm, the semi-minor axis b=10.065mm of elliptic roller track according to top formula.
When the steel ball rolling channel form of multi-row ball type slewing bearing is ellipse, the raceway accuracy to shape is more easy to control, and because elliptic roller track is the raceway of variable curvature, when wrapping angle changes, the raceway curvature of point of contact is made corresponding change, therefore can improve the contact stress state of steel ball and raceway, improve the raceway bearing capacity, and then improve the service behaviour and the life-span of pivoting support.After adopting elliptic roller track, under the identical situation of raceway quenching hardness, depth of hardening zone and wrapping angle, the bearing capacity of this kind multi-row ball type slewing bearing can improve 33% with respect to the bearing capacity of the multi-row ball type slewing bearing of peach shape raceway.
This pivoting support can be divided into external tooth type, internal gear type and no tooth-like three kinds: the external tooth type pivoting support is that the outer ring surface in the outer ring adds external toothings such as work gear, worm gear or sprocket wheel; The internal gear type pivoting support is that the inner ring surface at inner ring adds ring gears such as work gear; The inside and outside circle that does not have tooth-like pivoting support does not all have gear ring.
Multi-row ball type slewing bearing of the present invention is being added man-hour,, using numerically controlled lathe and carry out the semi finishing of raceway earlier according to the raceway parameter of calculating.Adding man-hour, the raceway curve form rule of numerical control turning, low, the raceway limit mouth circular arc chamfering radius unanimity of surface roughness, and with the roller surface smooth connection.The raceway curved surface of rule makes depth of hardening zone evenly become possibility, and " sharp angle effect " the when chamfering of smooth connection has been avoided quenching eradicated the defective of raceway limit mouth easy hardening crack.Numerical control turning raceway curved surface removes rough surface and is outside one's consideration, and the raceway curved surface after all the other sizes and the grinding is in full accord, so the grinding allowance of raceway is very little.
Use the method for Frequency Induction Heating more semi-finished raceway is carried out the surface heat processing, quenching hardness is 55～60HRC, and depth of hardening zone is greater than 2.8mm.
Then the each several part to pivoting support carries out fine finishing.
If tooth-like pivoting support also needs to adopt numerical control tooth working machine tool to carry out gear ring processing.
Adopt numerical control drilling machine to carry out axial mounting hole processing then at inside and outside circle axial plane.
At last the raceway after the tempering is formed grinding or turning processing.The most important thing is grinding wheel dressing in the form grinding, the three-coordinate linkage that utilizes numerical control raceway special purpose grinder can reach good effect by the finishing moulding of program control emery wheel.Avoided tool setting and be similar to finishing and the error of generation from principle, raceway shape and original wrapping angle are effectively guaranteed.The position control accuracy of numerical control raceway special purpose grinder can satisfy the microfeed in the grinding, improves the machining accuracy of raceway.The function of mending the cutter of form turning processing and utilization numerical control raceway special purpose lathe realizes the shaping processing of raceway, machining accuracy, efficient height, processing environment cleaning.
Claims (10)
1. multi-row ball type slewing bearing comprises outer ring (1), inner ring (2), steel ball (3), it is characterized in that:
A, outer ring (1) and inner ring (2) are ring part, and inner ring (2) is assemblied in the interior annular distance of outer ring (1), and the last lower plane of inner ring (2) all is higher than the last lower plane of outer ring (1); Be higher than outer ring (1) at inner ring (2) and go up and to have annular groove on the outer ring surface on plane Stamping Steel Ribbon (4) is installed, be lower than in outer ring (1) and have time annular groove on the inner ring surface of inner ring (2) lower plane Stamping Steel Ribbon (4) is installed; The axial plane of (1) and inner ring (2) is equipped with mounting hole in the outer ring;
On the inner ring surface of b, outer ring (1) according to certain size spaced apart be provided with at least three row in raceway; Also offer at least three exclusive raceways on the outer ring surface of inner ring (2), its position is corresponding with the interior raceway of outer ring; The shape of inside and outside raceway is identical, and corresponding inside and outside raceway has formed complete steel ball rolling channel; The uniform steel ball (3) that is placed with in every row's steel ball rolling channel adopts spacing block (6) or integral cage (7) to isolate between the steel ball (3);
C, every row's steel ball rolling channel all communicate with a plugging hole, and obstruction (8) is equipped with greater than the diameter of steel ball (3) in the plugging hole aperture in the hole, stagger mutually in the plugging hole position of adjacent raceway; Every row's steel ball rolling channel all communicates with an oil duct, and oil duct is equipped with lubricating cup (5) away from an end of steel ball rolling channel.
2. multi-row ball type slewing bearing according to claim 1 is characterized in that: the structural type of steel ball rolling channel is a peach shape raceway, is two circular arcs two center of circle, raceway symmetries up and down; The ratio t of raceway radius of curvature R and steel ball radius of curvature r is 1.02～1.08, and wrapping angle β is 45 °～50 °.
3. multi-row ball type slewing bearing according to claim 1 is characterized in that: the structural type of steel ball rolling channel is an elliptic roller track; The major semi axis of elliptic roller track, semi-minor axis formula are as follows:
In the following formula: a---the major semi axis of elliptic roller track;
The semi-minor axis of b---elliptic roller track;
R---steel ball radius of curvature;
The ratio of the radius of curvature R of t---raceway and steel ball point of contact and steel ball radius of curvature r, R/r;
The wrapping angle of β---steel ball and raceway;
Ratio of curvature t span is: 1.01-1.12, wrapping angle β are 30 °-60 °.
4. according to claim 1,2 or 3 described multi-row ball type slewing bearings, it is characterized in that: the outer ring surface of (1) has external toothing in the outer ring.
5. multi-row ball type slewing bearing according to claim 4 is characterized in that: external toothing can be gear, worm gear or sprocket wheel.
6. according to claim 1,2 or 3 described multi-row ball type slewing bearings, it is characterized in that: the inner ring surface at inner ring (2) has ring gear.
7. multi-row ball type slewing bearing according to claim 6 is characterized in that: ring gear can be a gear.
8. according to claim 1,2 or 3 described multi-row ball type slewing bearings, it is characterized in that: outer ring (1) and inner ring (2) all do not have gear ring.
9. the processing method of claim 4 or 6 described multi-row ball type slewing bearings is:
A, adopt numerically controlled lathe that raceway is carried out semi finishing according to calculating resulting raceway parameter;
B, raceway quench and adopt mid-frequency induction hardening;
C, the pivoting support each several part is carried out fine finishing;
D, employing numerical control tooth working machine tool carry out gear ring processing;
E, employing numerical control drilling machine carry out axial mounting hole processing at inside and outside circle axial plane;
F, application numerical control raceway special purpose grinder or numerical control raceway special purpose lathe form processing to raceway.
10. the processing method of the described multi-row ball type slewing bearing of claim 8 is:
A, adopt numerically controlled lathe that raceway is carried out semi finishing according to calculating resulting raceway parameter;
B, raceway quench and adopt mid-frequency induction hardening;
C, the pivoting support each several part is carried out fine finishing;
D, employing numerical control drilling machine carry out axial mounting hole processing at inside and outside circle axial plane;
E, application numerical control raceway special purpose grinder or numerical control raceway special purpose lathe form processing to raceway.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102166361A CN101893036A (en) | 2010-07-02 | 2010-07-02 | Multi-row ball type slewing bearing and machining method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102166361A CN101893036A (en) | 2010-07-02 | 2010-07-02 | Multi-row ball type slewing bearing and machining method thereof |
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| CN2010102166361A Pending CN101893036A (en) | 2010-07-02 | 2010-07-02 | Multi-row ball type slewing bearing and machining method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102562793A (en) * | 2011-12-15 | 2012-07-11 | 河南科技大学 | Crossed roller and four-point sphere combined high-accuracy heavy-load slewing bearing |
| CN102606626A (en) * | 2012-03-06 | 2012-07-25 | 马鞍山方圆回转支承股份有限公司 | Crowned teeth slewing bearing |
| CN102619880A (en) * | 2012-03-30 | 2012-08-01 | 亨利安管理咨询（青岛）有限公司 | Rotary support sealing type plug and sealing method |
| CN103291758A (en) * | 2013-05-21 | 2013-09-11 | 徐州罗特艾德回转支承有限公司 | Slewing bearing with oil drainage holes |
| CN103486422A (en) * | 2013-08-29 | 2014-01-01 | 蚌埠市国恒机械设备有限公司 | Automatic three-hole-type oiling device |
| CN105299061A (en) * | 2015-11-16 | 2016-02-03 | 耒阳新达微科技有限公司 | Bearing capable of sucking grease |
| CN105822661A (en) * | 2016-06-01 | 2016-08-03 | 河南科技大学 | Design method and device of structural parameters of major and minor semi axes of elliptical race ball bearing |
| CN106670734A (en) * | 2016-07-27 | 2017-05-17 | 马鞍山市安耐特回转支承有限公司 | Machining method of worm gear type pivoting support |
| CN107199438A (en) * | 2016-03-18 | 2017-09-26 | 徐州万达回转支承有限公司 | The processing technology of WEA12 revolution driving pivoting supports |
| CN111347178A (en) * | 2020-05-13 | 2020-06-30 | 常州奥旋重型轴承有限公司 | Integral bearing with bottom plate for laser cutting equipment |
| CN114135576A (en) * | 2021-12-13 | 2022-03-04 | 中国铁建重工集团股份有限公司 | Main bearing of heading machine and machining method of main bearing outer ring assembly |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102562793A (en) * | 2011-12-15 | 2012-07-11 | 河南科技大学 | Crossed roller and four-point sphere combined high-accuracy heavy-load slewing bearing |
| CN102606626A (en) * | 2012-03-06 | 2012-07-25 | 马鞍山方圆回转支承股份有限公司 | Crowned teeth slewing bearing |
| CN102619880A (en) * | 2012-03-30 | 2012-08-01 | 亨利安管理咨询（青岛）有限公司 | Rotary support sealing type plug and sealing method |
| CN102619880B (en) * | 2012-03-30 | 2014-04-02 | 亨利安（青岛）自动化技术有限公司 | Rotary support sealing type plug and sealing method |
| CN103291758A (en) * | 2013-05-21 | 2013-09-11 | 徐州罗特艾德回转支承有限公司 | Slewing bearing with oil drainage holes |
| CN103486422A (en) * | 2013-08-29 | 2014-01-01 | 蚌埠市国恒机械设备有限公司 | Automatic three-hole-type oiling device |
| CN105299061A (en) * | 2015-11-16 | 2016-02-03 | 耒阳新达微科技有限公司 | Bearing capable of sucking grease |
| CN107199438A (en) * | 2016-03-18 | 2017-09-26 | 徐州万达回转支承有限公司 | The processing technology of WEA12 revolution driving pivoting supports |
| CN105822661A (en) * | 2016-06-01 | 2016-08-03 | 河南科技大学 | Design method and device of structural parameters of major and minor semi axes of elliptical race ball bearing |
| CN106670734A (en) * | 2016-07-27 | 2017-05-17 | 马鞍山市安耐特回转支承有限公司 | Machining method of worm gear type pivoting support |
| CN106670734B (en) * | 2016-07-27 | 2018-12-04 | 马鞍山市安耐特回转支承有限公司 | A kind of processing method of worm-gear type pivoting support |
| CN111347178A (en) * | 2020-05-13 | 2020-06-30 | 常州奥旋重型轴承有限公司 | Integral bearing with bottom plate for laser cutting equipment |
| CN114135576A (en) * | 2021-12-13 | 2022-03-04 | 中国铁建重工集团股份有限公司 | Main bearing of heading machine and machining method of main bearing outer ring assembly |
| CN114135576B (en) * | 2021-12-13 | 2023-10-31 | 中国铁建重工集团股份有限公司 | Main bearing of heading machine and processing method of main bearing outer ring assembly |
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Open date: 20101124 |