CN111468902A - Three-piece combined planetary frame machining method - Google Patents
Three-piece combined planetary frame machining method Download PDFInfo
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- CN111468902A CN111468902A CN202010371979.9A CN202010371979A CN111468902A CN 111468902 A CN111468902 A CN 111468902A CN 202010371979 A CN202010371979 A CN 202010371979A CN 111468902 A CN111468902 A CN 111468902A
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- output shaft
- bearing seat
- planet carrier
- supporting
- machining
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- 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
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
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Abstract
A three-piece combined planetary frame processing method belongs to the field of planetary frame processing. The invention comprises the following steps: 1, after a bearing seat, a planet carrier and an output shaft are coaxially assembled and installed, machining a precision bolt hole, and installing a precision bolt in the precision bolt hole; 2, installing an alloy tip inside the output shaft when the bearing seat, the planet carrier and the output shaft are clamped, and installing the top end of the alloy tip in contact with the inside of the output shaft; 3, finishing the bearing seat supporting excircle and the output shaft supporting excircle; 4, the bearing seat, the planet carrier and the output shaft are arranged on the boring jig; 5 finely boring a planetary wheel axle hole; 6, performing finish machining on the scraping surface of the planet wheel shaft hole by using a scraping surface cutter bar and a scraping surface cutter; 7, marking the mounting positions of the bearing seat, the planet carrier and the output shaft during processing, and fixedly clamping the planet carrier and the output shaft on a boring clamp; 8, processing a clamp spring groove on a planet wheel shaft hole of the planet carrier. The invention reduces the assembly coaxial error, improves the frame manufacturing precision and avoids the influence of the assembly error on the excircle grinding process.
Description
Technical Field
The invention relates to a method for processing a three-piece combined planetary frame, and belongs to the field of planetary frame processing.
Background
The planetary reducer is an important part for large heavy-duty mechanical walking drive, and has the characteristics of compact structure, high bearing capacity, high transmission precision and high efficiency. The main components of the planetary reducer comprise a central wheel, a planetary frame, a planetary wheel shaft, a bearing and the like, the planetary frame is one of important components of planetary transmission, and the processing precision of the planetary frame directly influences the performance of a planetary reduction mechanism. The planet carrier can be divided into five types, namely an integral frame type structure, a welding structure, a casting structure, a cantilever type structure with detachable side plates, an integral structure and a combined structure of a single-side-plate planet wheel shaft cantilever. The design of the planetary gear carrier is selected according to the functional requirements, the manufacturing method and the assembly conditions of the planetary gear reducer.
A three-piece combined planetary frame belongs to a combined planetary wheel frame which is composed of a bearing seat, a planetary carrier and an output shaft in a combined structure. Aiming at a three-piece combined planetary frame, the original processing mode has the following problems:
1. the machining process is complex, the precision of the machined part is low, no proper machining tool is provided, and the machined bearing seat, the machined planet carrier and the output shaft are assembled together, so that a large coaxial assembly error is caused;
2. after the original processing and clamping mode is used for processing, the wall thickness of a center point of a bearing seat of a part is too small, so that the center point is necessarily deformed, and the deformation of the center point seriously influences the grinding precision of an excircle and influences the assembly and use of a planetary frame;
3. two outer circles are combined and then are subjected to top grinding, and the two outer circles are easy to collide in the process of transportation after grinding, so that the two outer circles are staggered to generate a coaxial error;
4. the countersunk hole on the planet carrier of the part can influence the boring precision due to intermittent cutting when the planet wheel shaft hole is combined and finely bored.
Therefore, a need exists to provide a method for processing a three-piece combined planetary frame to solve the above-mentioned technical problems.
Disclosure of Invention
The present invention has been developed in order to solve the problem that the original processing method of a three-piece combined planetary frame has large processing error and is easy to be deformed accidentally, and a brief summary of the present invention is provided below to provide a basic understanding of some aspects of the present invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to determine the key or critical elements of the present invention, nor is it intended to limit the scope of the present invention.
The technical scheme of the invention is as follows:
a three-piece combined planetary frame processing method comprises the following processing steps:
step a, after a bearing seat, a planet carrier and an output shaft are coaxially assembled, more than two precise bolt holes are processed on the bearing seat, the planet carrier and the output shaft, and precise bolts are arranged in the precise bolt holes;
b, clamping the bearing seat, the planet carrier and the output shaft, wherein an alloy tip is arranged in the output shaft during clamping, a mounting chamfer is processed in the output shaft, and the top end of the alloy tip is installed in contact with the inside of the output shaft;
c, after the bearing seat, the planet carrier and the output shaft are clamped, respectively performing finish machining on the bearing seat supporting excircle and the output shaft supporting excircle;
d, mounting the bearing seat, the planet carrier and the output shaft on a boring fixture after machining;
step e, finely boring a plurality of planetary wheel shaft holes on the bearing seat, the planet carrier and the output shaft;
f, performing scraped surface finish machining on the planet wheel shaft hole by using a scraped surface cutter bar and a scraped surface cutter;
g, respectively marking the combined installation positions of the bearing seat, the planet carrier and the output shaft in the coaxial processing by using codes, and after the bearing seat is disassembled, fixedly clamping the planet carrier and the output shaft on a boring clamp;
and h, processing snap spring grooves on a plurality of planet wheel shaft holes of the planet carrier by using a key groove milling cutter.
Preferably: the boring jig comprises pressing plates, fixing bolts, supporting bolts, a base and positioning bolts, wherein supporting bolt mounting holes and fixing bolt mounting holes are symmetrically formed in the left side and the right side of the upper end face of the base, the lower ends of the two fixing bolts are respectively mounted in the fixing bolt mounting holes, the lower ends of the two supporting bolts are respectively mounted in the supporting bolt mounting holes, the two pressing plates are respectively mounted in a matched mode with the two fixing bolts symmetrically arranged at the left side and the right side, the lower end faces of the two pressing plates are mounted in contact with the upper end face of each supporting bolt, a plurality of limiting holes are formed in the circumferential distribution of the central position of the upper end face of the base, the positioning bolts are mounted in the limiting holes, a frame mounting hole is formed in the center of.
Preferably: and g, when the bearing seat, the planet carrier and the output shaft are installed in a matched mode, installing according to the relative installation position of the bearing seat marked in the step g and the output shaft in the machining process.
Preferably: and e-h, mounting the positioning pin in the precise bolt hole during boring. The invention has the following beneficial effects:
1. the processing method of the three-piece combined planetary frame is simple in processing technology, and the bearing seat, the planetary frame and the output shaft are processed after being assembled and installed, so that large coaxial assembly errors caused by independent processing are greatly reduced;
2. the alloy center mounting position avoids the problems that the wall thickness of the center hole of the bearing seat of the part is too small, deformation is generated during processing, the grinding precision of an excircle is seriously influenced, and the assembly and the use of a planetary frame are influenced;
3. according to the three-piece combined planetary frame processing method, when two outer circles are ground in a butt-against mode after combination, the precise bolts are used for precise positioning, and the situation that the two outer circles are staggered and coaxial error is generated due to the fact that collision is easy to occur in transportation after grinding is avoided;
4. according to the three-piece combined planetary frame machining method, when the boring tool is arranged, the positioning pin is adopted to limit the rotation freedom degree of the workpiece, the problem of hole and cutter centering is solved, the trouble of alignment of each part during machining is avoided, and the machining efficiency is greatly improved;
5. the processing method of the three-piece combined planetary frame is mature in application, simple in operation and ingenious in design, greatly improves the assembly precision of the three-piece combined planetary frame, and is suitable for popularization and application of batch production.
Drawings
FIG. 1 is an assembly schematic of a three piece compound planetary frame;
FIG. 2 is a front view of the bearing housing;
FIG. 3 is a left side sectional view of the bearing housing;
FIG. 4 is a front view of the output shaft;
FIG. 5 is a left side sectional view of the output shaft;
FIG. 6 is a front sectional view of the planet carrier;
FIG. 7 is a left side view of the planet carrier;
FIG. 8 is a diagram of innovative clamping mode for top grinding of an outer circle;
FIG. 9 is a diagram of a conventional clamping manner for top grinding of an outer circle;
FIG. 10 is a top plan view of a precision bolt assembly;
FIG. 11 is a front sectional view of the precision bolt assembly;
FIG. 12 is a schematic top view of the boring tool in use;
FIG. 13 is a schematic front sectional view of the boring tool;
FIG. 14 is a schematic left side sectional view of the boring tool;
FIG. 15 is a schematic front sectional view of the combined shaving process;
in the figure, 1-a bearing seat, 2-a planet carrier, 3-an output shaft, 4-a planet wheel shaft, 5-a planet gear, 6-an alloy tip, 7-a boring clamp, 8-a locating pin, 9-a shaving cutter rod, 10-a shaving cutter, 11-a planet wheel shaft hole, 12-a precision bolt hole, 13-a precision bolt, 1-1-a bearing seat supporting excircle, 3-1-an output shaft supporting excircle, 3-2-a mounting chamfer, 71-a pressing plate, 72-a fixing bolt, 73-a supporting bolt, 74-a base, 741-a limiting hole, 742-a frame mounting hole, 743-a supporting bolt mounting hole and 744-a fixing bolt mounting hole.
Detailed Description
In order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The connection mentioned in the invention is divided into fixed connection and detachable connection, the fixed connection is non-detachable connection and comprises but is not limited to folding edge connection, rivet connection, bonding connection, welding connection and other conventional fixed connection modes, the detachable connection comprises but is not limited to threaded connection, buckle connection, pin connection, hinge connection and other conventional detachment modes, when the specific connection mode is not clearly defined, at least one connection mode can be found in the existing connection modes by default to realize the function, and the skilled person can select the connection mode according to the needs. For example: the fixed connection selects welding connection, and the detachable connection selects hinge connection.
The first embodiment is as follows: the present embodiment will be described with reference to fig. 1 to 15, and a method for processing a three-piece combined planetary frame according to the present embodiment includes the steps of:
step a, after a bearing seat 1, a planet carrier 2 and an output shaft 3 are coaxially assembled, more than two precise bolt holes 12 are processed on the bearing seat 1, the planet carrier 2 and the output shaft 3, and precise bolts 13 are installed in the precise bolt holes, so that the problems that impact is generated in the transfer, two supporting excircles are dislocated and a coaxial error is generated can be effectively avoided;
b, clamping the bearing seat 1, the planet carrier 2 and the output shaft 3, wherein an alloy tip 6 is arranged inside the output shaft 3 during clamping, a mounting chamfer 3-2 is processed inside the output shaft 3, the top end of the alloy tip 6 is installed in contact with the inside of the output shaft 3, if a traditional clamping mode of top grinding of an excircle is adopted, the wall thickness of the top hole of the bearing seat 1 is too small, the top hole is inevitably deformed after combination, and the deformation of the top hole seriously influences the grinding precision of the supporting excircle of the bearing seat 1;
step c, after the bearing seat 1, the planet carrier 2 and the output shaft 3 are clamped, respectively performing finish machining on a bearing seat supporting excircle 1-1 and an output shaft supporting excircle 3-1, and performing combined machining on the supporting excircle of the bearing seat 1 and the bearing supporting excircle of the output shaft 3, so that the assembly coaxial error is greatly reduced, and the frame manufacturing precision is improved;
d, mounting the bearing seat 1, the planet carrier 2 and the output shaft 3 on a boring clamp 7 after machining;
e, finely boring a plurality of planet axle holes 11 on the bearing seat 1, the planet carrier 2 and the output shaft 3;
f, performing scraping finish machining on the planet wheel shaft hole 11 by using the scraping cutter bar 9 and the scraping cutter 10, arranging a combined scraping procedure in the process in order to ensure the verticality and the parallelism of the installation positions of the two end surfaces of the planet carrier 2 and the planet gear 5, and performing window scraping finish machining by using the special scraping cutter bar 9 and the scraping cutter 10 after boring holes to ensure the size precision and the form and position tolerance;
g, marking the combined installation positions of the bearing seat 1, the planet carrier 2 and the output shaft 3 in the coaxial processing by using codes, and after the bearing seat 1 is disassembled, fixedly clamping the planet carrier 2 and the output shaft 3 on a boring clamp 7; the purpose of marking is that when bearing frame 1, planet carrier 2 and output shaft 3 are disassembled and assembled again, the bearing frame 1, planet carrier 2 and output shaft 3 which are assembled together can be guaranteed to be parts which are coaxially assembled and processed in processing, because the time base number is large in factory production, when the parts are disassembled and processed, the parts with the same name are put together, mixing is easy, and the pairing relation in processing of coaxial assembly is difficult to identify, but only the bearing frame 1, the planet carrier 2 and the output shaft 3 which are coaxially assembled and processed are matched best and the coaxiality is best, so the parts are respectively coded and marked when the bearing frame 1, the planet carrier 2 and the output shaft 3 are assembled, and the marking has the matching meaning. And finding out the parts which are coaxially combined and processed according to the content of the marks when the parts are finally assembled and used.
And h, processing the clamp spring grooves on the plurality of planet wheel shaft holes 11 of the planet carrier 2 by using a key groove milling cutter, and arranging the clamp spring groove milling process after boring to avoid the problem that the boring precision is influenced to a certain extent due to intermittent cutting.
The second embodiment is as follows: referring to fig. 1 to 4, the embodiment is described, based on the first embodiment, the boring jig 7 of the embodiment includes a pressing plate 71, fixing bolts 72, supporting bolts 73, a base 74 and positioning bolts 8, support bolt mounting holes 743 and fixing bolt mounting holes 744 are symmetrically formed on the left and right sides of the upper end surface of the base 74, the lower ends of the two fixing bolts 72 are respectively mounted in the fixing bolt mounting holes 744, the lower ends of the two supporting bolts 73 are respectively mounted in the support bolt mounting holes 743, the two pressing plates 71 are respectively mounted in cooperation with the two fixing bolts 72 symmetrically formed on the left and right ends, the lower end surfaces of the two pressing plates 71 are mounted in contact with the upper end surface of the supporting bolts 73, a plurality of limiting holes 741 are circumferentially distributed and processed at the central position of the upper end surface of the base 74, the positioning bolts 8 are mounted in the limiting holes 741, a frame mounting hole 742 is formed in the center of the upper end surface of the base 74, and the bearing seat 71, the carrier 72, and the output shaft 73 are mounted in the frame mounting hole 742.
The third concrete implementation mode: the present embodiment is described with reference to fig. 1 to 4, and based on the first embodiment, the bearing seat 1, the planet carrier 2, and the output shaft 3 are installed according to the relative installation position marked in step g when the bearing seat 1 and the output shaft 3 are installed in a matched manner, so that a matching error caused by different positions during installation is avoided.
The fourth concrete implementation mode: the embodiment is described with reference to fig. 1 to 4, and based on the first embodiment, in the steps e to h, during boring, the positioning pin 8 is installed in the precise bolt hole 12, and the positioning pin 8 is installed in the planetary wheel shaft hole 11 to limit the rotational degree of freedom of the workpiece, so that the problem of centering the hole and the cutter is solved, the trouble of aligning each part during machining is avoided, and the machining efficiency is greatly improved.
The fifth concrete implementation mode: referring to fig. 1 to 4, the embodiment will be described, and based on the first embodiment, the method for processing a three-piece combined planetary frame of the embodiment combines the fine machining bearing seat support outer circle 1-1 and the output shaft support outer circle 3-1 in step c, and the error analysis is as follows:
1. the bearing seat supporting excircle 1-1 and the output shaft supporting excircle 3-1 are processed in a single piece, and the coaxial error analysis after combination is as follows:
the coaxiality tolerance of the spigot of the bearing seat 1 and the excircle is 0.05;
the positioning fit between the bearing seat 1 and the spigot of the planet carrier 2 is phi 138H7/f7, and the maximum clearance is equal to the maximum hole and the minimum shaft is equal to 0.04+0.083 equal to 0.123;
the coaxiality tolerance of the output shaft supporting outer circle 3-1 and the spigot of the output shaft is 0.05;
the positioning fit between the output shaft 3 and the spigot of the planet carrier 2 is phi 138H7/f7, and the maximum clearance is equal to the maximum hole-the minimum shaft is equal to 0.04+0.083 equal to 0.123;
after combination, the maximum coaxiality error of the bearing seat support excircle 1-1 and the output shaft support excircle 3-1 is as follows:
0.05+0.123+0.05 ═ 0.223; the spigot fit is only one, and the minimum is 0.043;
2. c, combining and processing the bearing seat support excircle 1-1 and the output shaft support excircle 3-1, finely boring the planet wheel shaft hole 11, disassembling, recombining the marks of the relative installation positions during processing according to the step c during assembly, and analyzing errors during reassembling as follows:
the tolerance of the four planet axle holes 11 is 0.021;
the deviation of the planet wheel shaft 4 is +0.015+ 0.002;
because the fit clearance between the planet axle hole 11 and the planet axle 4 is less than the minimum clearance of phi 138H7/f7 of spigot positioning fit of 0.043, the maximum fit clearance between the planet axle hole 11 and the planet axle 4 is the maximum coaxial error of the two bearing support circles during frame assembly;
maximum coaxial error is equal to maximum hole-minimum axis is equal to 0.021-0.002 is equal to 0.019;
comparing the two maximum coaxial error values of 0.223 and 0.019, the frame assembly precision can be greatly improved by adopting the combined processing bearing seat to support the excircle 1-1 and the output shaft to support the excircle 3-1.
It should be noted that, in the above embodiments, as long as the technical solutions can be aligned and combined without contradiction, those skilled in the art can exhaust all possibilities according to the mathematical knowledge of the alignment and combination, and therefore, the present invention does not describe the technical solutions after alignment and combination one by one, but it should be understood that the technical solutions after alignment and combination have been disclosed by the present invention.
This embodiment is only illustrative of the patent and does not limit the scope of protection thereof, and those skilled in the art can make modifications to its part without departing from the spirit of the patent.
Claims (4)
1. A three-piece combined planetary frame processing method comprises the following processing steps:
step a, after a bearing seat (1), a planet carrier (2) and an output shaft (3) are coaxially assembled, more than two precise bolt holes (12) are processed on the bearing seat (1), the planet carrier (2) and the output shaft (3), and precise bolts (13) are installed in the precise bolt holes;
b, clamping the bearing seat (1), the planet carrier (2) and the output shaft (3), installing an alloy tip (6) inside the output shaft (3) during clamping, processing an installation chamfer (3-2) inside the output shaft (3), and installing the top end of the alloy tip (6) in contact with the inside of the output shaft (3);
c, clamping the bearing seat (1), the planet carrier (2) and the output shaft (3), and then respectively finishing the bearing seat supporting excircle (1-1) and the output shaft supporting excircle (3-1);
d, mounting the bearing seat (1), the planet carrier (2) and the output shaft (3) on a boring clamp (7) after machining;
e, finely boring a plurality of planet wheel shaft holes (11) on the bearing seat (1), the planet carrier (2) and the output shaft (3);
f, performing scraped surface finish machining on the planet wheel shaft hole (11) by using a scraped surface cutter bar (9) and a scraped surface cutter (10);
g, marking the combined installation positions of the bearing seat (1), the planet carrier (2) and the output shaft (3) in the coaxial processing by using codes, and fixing and clamping the planet carrier (2) and the output shaft (3) on a boring clamp (7) after the bearing seat (1) is disassembled;
and h, processing snap spring grooves on a plurality of planet wheel shaft holes (11) of the planet carrier (2) by using a key groove milling cutter.
2. The method for machining the three-piece combined planetary frame as claimed in claim 1, wherein the method comprises the following steps: the boring clamp (7) comprises a pressing plate (71), fixing bolts (72), supporting bolts (73), a base (74) and a positioning bolt (8), wherein supporting bolt mounting holes (743) and fixing bolt mounting holes (744) are symmetrically processed on the left side and the right side of the upper end face of the base (74), the lower ends of the two fixing bolts (72) are respectively installed in the fixing bolt mounting holes (744), the lower ends of the two supporting bolts (73) are respectively installed in the supporting bolt mounting holes (743), the two pressing plates (71) are respectively installed in a matching manner with the two fixing bolts (72) which are symmetrical on the left side and the right side, the lower end faces of the two pressing plates (71) are installed in contact with the upper end face of the supporting bolt (73), a plurality of limiting holes (741) are circumferentially distributed and processed in the center of the upper end face of the base (74), the positioning bolt (8) is installed in the limiting holes (741), a frame mounting hole (742) is processed in the center, the bearing holder (71), the planet carrier (72), and the output shaft (73) are mounted in the frame mounting hole (742).
3. The method for machining the three-piece combined planetary frame as claimed in claim 1, wherein the method comprises the following steps: and when the bearing seat (1), the planet carrier (2) and the output shaft (3) are installed in a matched mode, the bearing seat (1) and the output shaft (3) marked in the step g are installed according to the relative installation positions in the machining process.
4. The method for machining the three-piece combined planetary frame as claimed in claim 1, wherein the method comprises the following steps: steps e-h are to install the locating pin (8) in the precision bolt hole (12) during boring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010371979.9A CN111468902A (en) | 2020-05-06 | 2020-05-06 | Three-piece combined planetary frame machining method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010371979.9A CN111468902A (en) | 2020-05-06 | 2020-05-06 | Three-piece combined planetary frame machining method |
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| CN111468902A true CN111468902A (en) | 2020-07-31 |
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| CN202010371979.9A Pending CN111468902A (en) | 2020-05-06 | 2020-05-06 | Three-piece combined planetary frame machining method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115229442A (en) * | 2022-07-28 | 2022-10-25 | 大连日牵电机有限公司 | Combined machining method for frame and planet carrier of mining dump truck |
| CN115740975A (en) * | 2022-11-22 | 2023-03-07 | 北京北方车辆集团有限公司 | High-precision integral planetary frame machining method |
-
2020
- 2020-05-06 CN CN202010371979.9A patent/CN111468902A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115229442A (en) * | 2022-07-28 | 2022-10-25 | 大连日牵电机有限公司 | Combined machining method for frame and planet carrier of mining dump truck |
| CN115740975A (en) * | 2022-11-22 | 2023-03-07 | 北京北方车辆集团有限公司 | High-precision integral planetary frame machining method |
| CN115740975B (en) * | 2022-11-22 | 2024-06-11 | 北京北方车辆集团有限公司 | High-precision integral type planet frame processing method |
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