CN105522351A - Lengthened shaft and manufacturing method thereof - Google Patents
Lengthened shaft and manufacturing method thereof Download PDFInfo
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- CN105522351A CN105522351A CN201610057336.0A CN201610057336A CN105522351A CN 105522351 A CN105522351 A CN 105522351A CN 201610057336 A CN201610057336 A CN 201610057336A CN 105522351 A CN105522351 A CN 105522351A
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- shaft part
- dowel hole
- welding
- hole
- protective sleeve
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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
Abstract
The invention relates to the technical field of part machining and discloses a manufacturing method of a lengthened shaft. The method comprises the steps that two same original shafts to be lengthened are the bases, a shaft section is cut off from each original shaft according to the setting, the lengthening requirement is met after the two shaft sections are connected, and the two shaft sections are connected in an inserted mode and welded and fixed in the butt joint position. In addition, the method comprises the step of machining a protective sleeve, specifically, multiple plug welding holes annularly distributed are formed in the protective sleeve in the circumferential direction, the protective sleeve is arranged on the connected shaft sections in a sleeving mode, the plug welding holes are aligned at the butt joint position of the two shaft sections, and the plug welding holes and the two ends of the protective sleeve are welded. The method improves the coaxiality and strength of the lengthened shaft and prolongs the service life of the lengthened shaft. The invention further discloses the lengthened shaft manufactured through the manufacturing method of the lengthened shaft. The lengthened shaft is good in coaxiality, high in strength and long in service life.
Description
Technical field
The present invention relates to parts machining technical field, particularly relate to a kind of extension shaft and method of manufacturing technology thereof.
Background technology
In the new product development design phase, for reducing development cost and shortening product development cycle, before new product designs data (digital-to-analogue) are freezed, mainly carry out new product concept design.After the concept product design phase completes, for verifying the feasibility of design, usually needing to carry out associated verification and basic data acquisition work to design, now needing to make relevant exemplar to carry out the checking of relevant design scheme.Usual way realizes exemplar by exploitation sample-piece mold to make, but because the mould development one side cycle is longer, design is also in Qualify Phase on the other hand, there is certain risk, if now carry out mould development can increase product development cost and risk, therefore generally do not adopt the mode of mold developing.
Such as, on existing automobile, certain shaft element is long is 600mm, and in order to new product designs exploitation checking needs, now need lengthen 50mm, namely total length reaches 650mm, to meet the test requirements document of concept sample car.For this situation, current technological means is adopt to existing parts the mode directly cut off and pull open lengthening, as shown in Figure 1, existing parts is cut into two sections along center line, then on welding between two sections of parts, the lengthening section of 50mm, eliminates the exploitation lengthening mould.But there is following defect in the extension shaft that this mode obtains:
One is welding region high concentration, causes welding stress effectively to discharge, increases parts risk of breakage, the service life of the parts after the impact transformation of the way;
Two is that the axiality of lengthening section and original parts not easily ensures, makes the axiality of extension shaft poor owing to manufacturing mismachining tolerance.
Summary of the invention
The object of the present invention is to provide a kind of extension shaft and method of manufacturing technology thereof, to improve the quality after adding shaft element lengthening, service life and axiality.
To achieve these goals, the invention provides following technical scheme:
A method of manufacturing technology for extension shaft, is characterized in that, comprises the following steps:
A. choose the original axis that identical two pieces is to be lengthened, label is A axle and B axle respectively, by A axle longitudinally center line cut into isometric A1 shaft part and A2 section; After moving predeterminable range along B axle longitudinal center's alignment side, draw line of cut that is lower and B axle longitudinal center line parallel, along described line of cut, B axle is cut into longer B1 shaft part and shorter B2 shaft part;
B. choose A1 shaft part and B1 shaft part is for subsequent use, and multidiameter is processed in one end of a wherein shaft part, the end face of another shaft part is processed the circular groove coordinated for described multidiameter grafting;
C. the end face cooperatively interacted at A1 shaft part and B1 shaft part respectively carries out bevel process, and welds after A1 shaft part and the grafting of B1 shaft part at joint, forms C axle;
D. process protective sleeve, the size of protective sleeve meets after it is socketed in C axle outside and coordinates with C shaft clearance, and offers multiple plug welding hole on the protective sleeve, and multiple plug welding hole is arranged ringwise along the circumference of protective sleeve;
E. protective sleeve is socketed on C axle, and the joint of plug welding hole place circumference with A1 shaft part and B1 shaft part is alignd, then weld at each plug welding hole place;
F. be welded and fixed in one end of protective sleeve and A1 shaft part, the other end and B1 shaft part are welded and fixed.
Preferably, the method for manufacturing technology of described extension shaft is further comprising the steps of:
A1 shaft part is processed the first dowel hole, B1 shaft part is processed the second dowel hole;
When processing protective sleeve, process the 3rd dowel hole and the 4th dowel hole on the protective sleeve;
When protective sleeve is socketed on C axle, by the 3rd dowel hole and the first dowel hole co-axially align, and by the 4th dowel hole and the second dowel hole co-axially align; Then the first alignment pin is welded and fixed through after the 3rd dowel hole and the first dowel hole, the second alignment pin is welded and fixed through after the 4th dowel hole and the second dowel hole, and the welding process of alignment pin was carried out before the welding of plug welding hole place.
Preferably, the axis of described 3rd dowel hole is mutually vertical with the axis of described 4th dowel hole.
Preferably, when welding at plug welding hole place, along C axle longitudinal centre line direction, with the peak of plug welding hole for welding starting point, the edge then along plug welding hole adds welding fluid once by counter clockwise direction in the position every 90 degree.
Preferably, described plug welding hole is four, and the angle often between adjacent two described plug welding holes is 90 degree, and when welding, first to a pair plug welding hole positioned opposite welding simultaneously, then to another to plug welding hole positioned opposite welding simultaneously.
Preferably, when the first alignment pin and the welding of the second alignment pin, along C axle longitudinal centre line direction, with the peak of the dowel hole of correspondence for welding starting point, the edge then along dowel hole adds welding fluid once by counter clockwise direction in the position every 90 degree.
Preferably, the welding material in all welding operations is J506 welding rod.
A kind of extension shaft, comprise A1 shaft part, B1 shaft part and protective sleeve, the multidiameter end face on described A1 shaft part coordinates with the circular groove grafting on described B1 shaft part end face, and is welded and fixed formation C axle at joint; Described protective sleeve to be socketed on described C axle and to coordinate with described C shaft clearance, and described protective sleeve is provided with and organizes plug welding hole more, and the described plug welding hole of many groups is arranged ringwise along the circumference of described protective sleeve; And described plug welding hole place circumference aligns with the weld seam of described A1 shaft part and described B1 shaft part, and be welded and fixed with described C axle respectively at the two ends of described plug welding hole place and described protective sleeve.
Preferably, described A1 shaft part is provided with the first dowel hole, and described B1 shaft part is provided with the second dowel hole, and described protective sleeve is provided with three dowel hole coaxial with described first dowel hole and four dowel hole coaxial with described second dowel hole; First alignment pin is welded and fixed through after described first dowel hole, the 3rd dowel hole, and the second alignment pin is welded and fixed through after described second dowel hole, the 4th dowel hole.
Preferably, described first alignment pin is vertical with described second alignment pin is arranged.
Beneficial effect of the present invention is:
The method of manufacturing technology of extension shaft provided by the invention, utilize two identical original axis to be lengthened as lengthening basis, in order to meet the extension length demand of axle, the shaft part intercepted from two original axis adopts the mode of grafting to connect, improve the axiality of extension shaft, weld at shaft part joint, and use protective sleeve, the plug welding hole on protective sleeve is utilized to be welded and fixed in the commissure of extension shaft, and the two ends of protective sleeve are welded and fixed with extension shaft simultaneously, protective sleeve improves the intensity of extension shaft, reduce the risk of extension shaft fracture, be beneficial to the service life of improving extension shaft.
Present invention also offers a kind of extension shaft; this extension shaft is coordinated by A1 shaft part and the grafting of B1 shaft part, has good axiality, and has protective sleeve to protect at the joint of A1 shaft part and B1 shaft part; optimize the stress distribution of joint weld seam, improve intensity and the service life of extension shaft.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, being briefly described to the accompanying drawing used required in embodiment below, and will being described in further detail specific embodiments of the invention by reference to the accompanying drawings, wherein
Fig. 1 is the structural representation of extension shaft obtained in prior art;
The flow chart of the extension shaft method of manufacturing technology that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 is the front view of A axle in the embodiment of the present invention;
Fig. 4 is the front view of B axle in the embodiment of the present invention;
Fig. 5 is the front view of A1 shaft part in the embodiment of the present invention;
Fig. 6 is the front view of B1 shaft part in the embodiment of the present invention;
Fig. 7 is the front view of C axle in the embodiment of the present invention;
Fig. 8 is the sectional view of protective sleeve in the embodiment of the present invention;
Fig. 9 is the front view of extension shaft in the embodiment of the present invention;
Figure 10 is the explosive view of extension shaft in the embodiment of the present invention.
Label declaration wherein in above-mentioned accompanying drawing is as follows:
1-A axle, 2-B axle, 3-C axle, 4-protective sleeve, 5-extension shaft, 6-first alignment pin, 7-second alignment pin;
11-A1 shaft part, 12-A2 section, 13-circular groove, 14-first dowel hole;
21-B1 shaft part, 22-B2 shaft part, 23-multidiameter, 24-second dowel hole;
41-plug welding hole, 42-the 3rd dowel hole, 43-the 4th dowel hole;
A1-A axle longitudinal centre line, b1-B axle longitudinal centre line, c1-B axle line of cut;
The step of a ~ f-extension shaft method of manufacturing technology.
Detailed description of the invention
In order to make those skilled in the art understand technical scheme of the present invention better, do to introduce in detail further to this programme below in conjunction with specific embodiment.
With reference to figure 2, the method for manufacturing technology of the extension shaft that the embodiment of the present invention provides comprises the following steps:
Step a. chooses identical two pieces original axis to be lengthened, and label is A axle and B axle respectively, as shown in Figure 3 and Figure 4, A axle 1 is cut into isometric A1 shaft part 11 and A2 section 12 along A axle longitudinal centre line a1; For B axle 2, after moving predeterminable range along B axle longitudinal centre line b1 to side, draw the lower B axle line of cut c1 parallel with B axle longitudinal centre line b1, along described B axle line of cut c, B axle 2 is cut into longer B1 shaft part 21 and shorter B2 shaft part 22; Wherein, on B axle 2, the predeterminable range of movement equals B1 shaft part 21 in following steps and inserts distance in A1 shaft part 11 and original axis distance sum to be lengthened.
Step b. chooses A1 shaft part 11 and B1 shaft part 21 is for subsequent use, and multidiameter is processed in one end of a wherein shaft part, and the end face of another shaft part is processed the circular groove coordinated for described multidiameter grafting; In embodiments of the present invention, the end face of described A1 shaft part 11 has been processed into circular groove 13, and multidiameter 23 has been processed in one end of described B1 shaft part, as shown in Figure 5 and Figure 6.
The end face that step c cooperatively interacts at A1 shaft part 11 and B1 shaft part 21 respectively carries out bevel process, and wherein, groove is preferably V-butt, then welds after A1 shaft part and the grafting of B1 shaft part at joint, forms C axle 3, as shown in Figure 7;
Steps d. processing protective sleeve 4, with reference to figure 8, the size of protective sleeve 4 meets it and is socketed in outside rear and C axle 3 matched in clearance of C axle 3, and on protective sleeve 4, offer multiple plug welding hole 41, and multiple plug welding hole 41 is arranged ringwise along the circumference of protective sleeve;
Protective sleeve 4 is socketed on C axle 3 by step e., and is alignd with the joint of A1 shaft part 11 and B1 shaft part 21 by plug welding hole 41 place circumference, then welds at each plug welding hole 41 place;
Step f. is welded and fixed in one end of protective sleeve 4 and A1 shaft part 11, and the other end and B1 shaft part 21 are welded and fixed, and namely obtains extension shaft 5 as shown in Figure 9.
By the extension shaft that said method is obtained, because two shaft parts adopt the mode of grafting to connect, ensure that good axiality, and add protective sleeve structure, protection is carried out to two shaft part commissures and strengthens, improve intensity and the service life of reinforced shaft.
Further, the extension shaft method of manufacturing technology provided in the embodiment of the present invention, further comprising the steps of:
As shown in Figure 10, A1 shaft part is processed the first dowel hole 14, B1 shaft part is processed the second dowel hole 24; When processing protective sleeve 4, protective sleeve 4 processes the 3rd dowel hole 42 and the 4th dowel hole 43; When protective sleeve 4 is socketed on C axle 3, by the 3rd dowel hole 42 and the first dowel hole 14 co-axially align, and by the 4th dowel hole 43 and the second dowel hole 24 co-axially align; Then the first alignment pin 6 is welded and fixed through after the 3rd dowel hole 42 and the first dowel hole 14, second alignment pin 7 is welded and fixed through after the 4th dowel hole 43 and the second dowel hole 24, and the welding process of alignment pin was carried out before the welding of plug welding hole 41 place.Further increased the axiality of extension shaft by the positioning action of the first alignment pin 6 and the second alignment pin 7, the quality of the extension shaft provided is provided.
Preferably, the axis of described 3rd dowel hole 42 is mutually vertical with the axis of described 4th dowel hole 43, described first alignment pin 6 and described second alignment pin 7 is arranged vertically mutually, is beneficial to raising locating effect.
Preferably, when welding at plug welding hole 41 place, along the longitudinal centre line direction of C axle 3, with the peak of plug welding hole 41 for welding starting point, then the circumference along plug welding hole 41 adds welding fluid once by counter clockwise direction in the position every 90 degree, plug welding order like this, and the welding fluid at plug welding hole place is more even, the stress of commissure is more even, improves welding quality.
Further, in embodiments of the present invention, described plug welding hole 41 is four, angle often between adjacent two described plug welding holes is 90 degree, and when welding, first to a pair plug welding hole 41 positioned opposite welding simultaneously, then to another to plug welding hole 41 positioned opposite welding simultaneously, be beneficial to the stressed of commissure when optimizing welding.
In addition, when described first alignment pin 6 and described second alignment pin 7 weld, adopt welding manner same as described above, namely along C axle longitudinal centre line direction, with the peak of the dowel hole of correspondence for welding starting point, the edge then along dowel hole adds welding fluid once by counter clockwise direction in the position every 90 degree.
In all welding operations, welding material all adopts J506 welding rod, DC welder welds, answer welding rod to put into baking oven before weldering to heat, heating-up temperature is preferably 350 DEG C, preferably 1 hour heat time, put into incubator after welding rod heating and carry out isothermal holding in order to welding use, adopt DC reverse connection to weld.。
The embodiment of the present invention additionally provides a kind of extension shaft, as shown in Figure 9 and Figure 10, comprise A1 shaft part 11, B1 shaft part 21 and protective sleeve 4, the multidiameter end face on described A1 shaft part 11 coordinates with the circular groove grafting on described B1 shaft part end face, and is welded and fixed formation C axle at joint; Described protective sleeve 4 to be socketed on described C axle and to coordinate with described C shaft clearance; and described protective sleeve 4 is provided with many group plug welding holes 41; multiple described plug welding hole 41 is arranged ringwise along the circumference of described protective sleeve 4; and described plug welding hole 41 place circumference aligns with the weld seam of described A1 shaft part 11 and described B1 shaft part 21, and be welded and fixed with described C axle respectively at the two ends of described plug welding hole 41 place and described protective sleeve 4.This extension shaft axiality is good, and intensity is high, long service life.
Preferably, described plug welding hole 41 is four groups, and the angle described in every two adjacent groups between plug welding hole 41 is 90 degree.
Further, described A1 shaft part 11 is also provided with the first dowel hole 14, described B1 shaft part 21 is provided with the second dowel hole 24, and described protective sleeve 4 is provided with three dowel hole 42 coaxial with described first dowel hole 14 and four dowel hole 43 coaxial with described second dowel hole 24; First alignment pin 6 is welded and fixed through after described first dowel hole 14, the 3rd dowel hole 42, and the second alignment pin 7 is welded and fixed through after described second dowel hole 24, the 4th dowel hole 43.Described first alignment pin 6 and the described second 7 pairs of extension shaft each several parts in location be connected and fixed the effect serving location, further to improve the axiality of extension shaft.
Preferably, described first alignment pin 6 is vertical with described second alignment pin 7 to be arranged, and can improve locating effect.
Structure of the present invention, feature and action effect is described in detail above according to the embodiment shown in diagram; the foregoing is only preferred embodiment of the present invention; but the present invention does not limit practical range with shown in drawing; every change done according to conception of the present invention; or be revised as the Equivalent embodiments of equivalent variations; do not exceed yet description with diagram contain spiritual time, all should in protection scope of the present invention.
Claims (10)
1. a method of manufacturing technology for extension shaft, is characterized in that, comprises the following steps:
A. choose the original axis that identical two pieces is to be lengthened, label is A axle and B axle respectively, by A axle longitudinally center line cut into isometric A1 shaft part and A2 section; After moving predeterminable range along B axle longitudinal center's alignment side, draw line of cut that is lower and B axle longitudinal center line parallel, along described line of cut, B axle is cut into longer B1 shaft part and shorter B2 shaft part;
B. choose A1 shaft part and B1 shaft part is for subsequent use, and multidiameter is processed in one end of one of them shaft part, the end face of another shaft part processes the circular groove coordinated with described multidiameter grafting;
C. the end face cooperatively interacted at A1 shaft part and B1 shaft part respectively carries out bevel process, and welds after A1 shaft part and the grafting of B1 shaft part at joint, forms C axle;
D. process protective sleeve, the size of protective sleeve meets after it is socketed in C axle outside and coordinates with C shaft clearance, and offers multiple plug welding hole on the protective sleeve, and multiple plug welding hole is arranged ringwise along the circumference of protective sleeve;
E. protective sleeve is socketed on C axle, and the joint of the circumference at plug welding hole place with A1 shaft part and B1 shaft part is alignd, then weld at each plug welding hole place;
F. be welded and fixed in one end of protective sleeve and A1 shaft part, the other end and B1 shaft part are welded and fixed.
2. the method for manufacturing technology of extension shaft according to claim 1, is characterized in that, further comprising the steps of:
A1 shaft part is processed the first dowel hole, B1 shaft part is processed the second dowel hole;
When processing protective sleeve, process the 3rd dowel hole and the 4th dowel hole on the protective sleeve
When protective sleeve is socketed on C axle, by the 3rd dowel hole and the first dowel hole co-axially align, and by the 4th dowel hole and the second dowel hole co-axially align; Then the first alignment pin is welded and fixed through after the 3rd dowel hole and the first dowel hole, the second alignment pin is welded and fixed through after the 4th dowel hole and the second dowel hole, and the welding process of alignment pin was carried out before the welding of plug welding hole place.
3. the method for manufacturing technology of extension shaft according to claim 2, is characterized in that, the axis of described 3rd dowel hole is mutually vertical with the axis of described 4th dowel hole.
4. the method for manufacturing technology of extension shaft according to claim 3, it is characterized in that, when welding at plug welding hole place, along C axle longitudinal centre line direction, with the peak of plug welding hole for welding starting point, the edge then along plug welding hole adds welding fluid once by counter clockwise direction in the position every 90 degree.
5. the method for manufacturing technology of extension shaft according to claim 4, it is characterized in that, described plug welding hole is four, angle often between adjacent two described plug welding holes is 90 degree, and when welding, first to a pair plug welding hole positioned opposite welding simultaneously, then to another to plug welding hole positioned opposite welding simultaneously.
6. the method for manufacturing technology of extension shaft according to claim 5, it is characterized in that, when the first alignment pin and the welding of the second alignment pin, along C axle longitudinal centre line direction, with the peak of the dowel hole of correspondence for welding starting point, the edge then along dowel hole adds welding fluid once by counter clockwise direction in the position every 90 degree.
7. the method for manufacturing technology of extension shaft according to claim 6, is characterized in that, the welding material in all welding operations is J506 welding rod.
8. an extension shaft, is characterized in that, comprises A1 shaft part, B1 shaft part and protective sleeve, and the multidiameter end face on described A1 shaft part coordinates with the circular groove grafting on described B1 shaft part end face, and is welded and fixed formation C axle at joint; Described protective sleeve to be socketed on described C axle and to coordinate with described C shaft clearance, and described protective sleeve organizes plug welding hole along being provided with more, organizes described plug welding hole more and arranges ringwise along the axis of described protective sleeve; And described plug welding hole place circumference aligns with the weld seam of described A1 shaft part and described B1 shaft part, and be welded and fixed with described C axle respectively at the two ends of described plug welding hole place and described protective sleeve.
9. extension shaft according to claim 8, it is characterized in that, described A1 shaft part is provided with the first dowel hole, described B1 shaft part is provided with the second dowel hole, and described protective sleeve is provided with three dowel hole coaxial with described first dowel hole and four dowel hole coaxial with described second dowel hole; First alignment pin is welded and fixed through after described first dowel hole, described 3rd dowel hole, and the second alignment pin is welded and fixed through after described second dowel hole, described 4th dowel hole.
10. extension shaft according to claim 9, is characterized in that, described first alignment pin is vertical with described second alignment pin to be arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610057336.0A CN105522351B (en) | 2016-01-26 | 2016-01-26 | A kind of extension shaft and its method of manufacturing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610057336.0A CN105522351B (en) | 2016-01-26 | 2016-01-26 | A kind of extension shaft and its method of manufacturing technology |
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| Publication Number | Publication Date |
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| CN105522351A true CN105522351A (en) | 2016-04-27 |
| CN105522351B CN105522351B (en) | 2017-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610057336.0A Active CN105522351B (en) | 2016-01-26 | 2016-01-26 | A kind of extension shaft and its method of manufacturing technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107253513A (en) * | 2017-06-02 | 2017-10-17 | 昆山吉海实业公司 | Container securing extension bar |
| CN107838637A (en) * | 2017-11-02 | 2018-03-27 | 盛瑞传动股份有限公司 | A kind of cam axis processing technique |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108944331B (en) * | 2018-07-12 | 2020-05-29 | 安徽江淮汽车集团股份有限公司 | Shortening and modifying process method for automobile torsion beam |
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| CN201100328Y (en) * | 2007-07-27 | 2008-08-13 | 唐志坤 | Coaxial axis connection structure |
| CN202391790U (en) * | 2011-11-22 | 2012-08-22 | 上海连成（集团）有限公司 | Novel extension shaft structure of extension shaft motor |
| CN103917795A (en) * | 2011-11-08 | 2014-07-09 | Ntn株式会社 | Welding method for outer joint member of constant velocity universal joint, and outer joint member |
| CN105033583A (en) * | 2015-07-28 | 2015-11-11 | 宁波捷成轴业有限公司 | Forming process method of welding shaft |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3791751A (en) * | 1972-01-28 | 1974-02-12 | Buffalo Brake Beam Co | Rod repair splice |
| CN201100328Y (en) * | 2007-07-27 | 2008-08-13 | 唐志坤 | Coaxial axis connection structure |
| CN103917795A (en) * | 2011-11-08 | 2014-07-09 | Ntn株式会社 | Welding method for outer joint member of constant velocity universal joint, and outer joint member |
| CN202391790U (en) * | 2011-11-22 | 2012-08-22 | 上海连成（集团）有限公司 | Novel extension shaft structure of extension shaft motor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107253513A (en) * | 2017-06-02 | 2017-10-17 | 昆山吉海实业公司 | Container securing extension bar |
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| CN107838637B (en) * | 2017-11-02 | 2019-06-11 | 盛瑞传动股份有限公司 | A kind of cam axis processing technique |
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| CN105522351B (en) | 2017-11-03 |
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