CN114211310B - Centering processing method for internal spline of rotary hub flying shear synchronous gear - Google Patents
Centering processing method for internal spline of rotary hub flying shear synchronous gear Download PDFInfo
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- CN114211310B CN114211310B CN202111393645.2A CN202111393645A CN114211310B CN 114211310 B CN114211310 B CN 114211310B CN 202111393645 A CN202111393645 A CN 202111393645A CN 114211310 B CN114211310 B CN 114211310B
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 40
- 238000003672 processing method Methods 0.000 title abstract description 5
- 238000010862 gear shaping Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 210000003781 tooth socket Anatomy 0.000 description 3
- 238000003754 machining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
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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
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/22—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23F—MAKING GEARS OR TOOTHED RACKS
- B23F23/00—Accessories or equipment combined with or arranged in, or specially designed to form part of, gear-cutting machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23F—MAKING GEARS OR TOOTHED RACKS
- B23F5/00—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made
- B23F5/12—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made by planing or slotting
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sampling And Sample Adjustment (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention discloses a hub flying shear synchronous gear internal spline centering processing method, which comprises the following steps: placing the synchronous gear on a gear shaper support to clamp the synchronous gear; placing the tool setting template on the synchronous gear, inserting pins into the two first pin holes on the tool setting template, enabling the two pins to be tightly attached to the inner holes of the synchronous gear, and inserting pins into the second pin hole and the third pin hole; s3, connecting the bottom of the side plate with a positioning piece, inserting the notch side of the positioning plate onto the external gear reference tooth, and connecting the top of the side plate with a tool setting template; s4, checking whether the central lines of the two pins in the second pin hole and the third pin hole are aligned with the central line of the external gear reference tooth by using a dial indicator on a tool setting sample plate through a front pull gauge and a rear pull gauge; s5, aligning the cutter teeth of the gear shaping cutter according to the reference tooth slot on the cutter aligning sample plate, so that the center of the cutter teeth of the gear shaping cutter is consistent with the center of the reference tooth slot on the cutter aligning sample plate; and S6, taking down the tool setting template and the positioning plate, and inserting the internal spline. The method is adopted to insert the internal spline, and the error is not more than 0.05mm.
Description
Technical Field
The invention belongs to the technical field of gear machining, and particularly relates to a centering machining method for an internal spline of a synchronous gear of a rotary hub flying shear.
Background
When the hub flying shear synchronous gear is used for processing the internal spline, the center of the reference tooth of the external gear with a certain size section from the end face of the gear is required to be centered with the center of the reference tooth slot of the internal spline, and the error is not more than 0.05mm. The conventional method is that after the external teeth of the synchronous gear are machined, a reference tooth of the external gear is used as a reference, a tool setting line of a reference tooth socket of the internal spline is drawn on the end face of the gear by manual scribing, and the internal spline is inserted according to the tool setting line during the insertion of the internal spline. However, the problem of the operation is that the center of the internal spline reference tooth socket and the center of the external gear reference tooth are larger in centering error due to scribing processing, and the requirement of the overlap accuracy of the shearing blade of the flying shear cannot be met.
Disclosure of Invention
The invention provides a method for centering and processing an internal spline of a rotary hub flying shear synchronous gear, which aims at the central line of a reference tooth of an external gear by using a tool setting template and a positioning piece, and inserts the internal spline according to the tool setting of a reference tooth slot on the tool setting template, so that the problem of large centering error between the center of the reference tooth slot of the internal spline and the center of the reference tooth of the external gear is solved, and the centering error between the reference tooth of the external gear and the reference tooth slot of the internal spline with a certain size on the end surface of the gear is ensured to be not more than 0.05mm.
The invention discloses a method for centering and processing internal splines of a synchronous gear of a rotary hub flying shear, which comprises the following steps:
s1, placing a synchronous gear on a gear shaper support, aligning according to the end face and the addendum circle of the synchronous gear, and clamping the synchronous gear, wherein the error is not more than 0.02 mm;
S2, placing the tool setting template on the upper end face of the synchronous gear, and respectively inserting pins into the two first pin holes on the tool setting template to enable the two pins to be tightly attached to the inner holes of the synchronous gear; the tool setting template is provided with three pin holes which are arranged in an isosceles triangle, a pin hole is further formed in the middle line of the bottom edge of the isosceles triangle, the pin holes at the two bottom corners of the isosceles triangle are marked as first pin holes, the pin holes at the top corners of the isosceles triangle are marked as second pin holes, the pin holes in the middle line of the bottom edge are marked as third pin holes, and pins are inserted into the second pin holes and the third pin holes; a reference tooth slot is formed in the middle of the tool setting sample plate on the center line and on the circumference of the inner hole of the synchronous gear;
S3, connecting and fixing the bottom of the side plate and a positioning piece, wherein the positioning piece comprises a positioning plate, a notch is formed in the positioning plate, the shape of the notch is matched with the shape of an external gear reference tooth of a synchronous gear, and the center line of the notch and the center line of the bottom edge on a tool setting template are on the same vertical plane; inserting the notch side of the positioning plate onto the external gear reference tooth, forcibly pushing to ensure that the positioning plate is tightly close to the external gear reference tooth, and connecting and fixing the top of the side plate with the tool setting template;
s4, checking whether the center lines of the two pins in the second pin hole and the third pin hole are aligned with the center line of the external gear reference tooth by using a dial indicator on the tool setting template by pulling a dial indicator back and forth, and if the difference between the table values is not more than 0.01mm, aligning the center of the reference tooth slot of the tool setting template with the center of the external gear reference tooth at the moment; if the mutual difference of the gauge values is larger than 0.01mm, the workbench of the gear shaper is finely adjusted, so that the central lines of two pins in the second pin hole and the third pin hole on the tool setting template are consistent with the feeding direction of the gear shaper;
S5, aligning the cutter teeth of the gear shaping cutter according to a reference tooth slot on a cutter aligning sample plate, so that the center of the cutter teeth of the gear shaping cutter is consistent with the center of the reference tooth slot on the cutter aligning sample plate; if the tooth positions are inconsistent, continuously adjusting the cutter teeth of the gear shaping cutter until the cutter tooth centers of the gear shaping cutter are consistent with the center of the reference tooth slot on the cutter setting template;
and S6, after the alignment adjustment is completed, the tool setting template and the positioning plate are taken down, and the internal spline can be inserted.
In the above technical solution, preferably, a groove is formed on one side of the bottom surface of the tool setting template, and a magnet is placed in the groove.
In the above technical solution, preferably, the tool setting template has a Y-shaped structure.
In the above technical scheme, preferably, the curb plate is "futilely" font structure, including last horizontal pole, bottom rail and montant, the distance between last horizontal pole and the bottom rail is greater than or equal to the thickness of tool setting template, and the bottom rail both sides are provided with the screw hole that link up from top to bottom, and every screw hole has set up a screw, the tool setting template is provided with the socket in the side of being connected with the curb plate, the width of socket equals the width of montant, curb plate top and tool setting template are pegged graft in socket department to through the screw fastening.
In the above technical scheme, preferably, a through hole is formed in the middle of the bottom of the side plate, and the side plate is connected with one end of the positioning piece in an interference fit manner at the through hole.
In the above technical scheme, preferably, the positioning piece further comprises a positioning column, one end of the positioning column is connected with the side plate, the other end of the positioning column is provided with a slot and a pin hole, and the positioning plate is inserted into the positioning column at the slot and fixed by a positioning pin penetrating through the pin hole.
The invention has the advantages and positive effects that:
according to the invention, the center line of the reference tooth of the external gear is aligned by using the tool setting template and the positioning piece, the tool is set according to the reference tooth groove on the tool setting template, and the internal spline is inserted, so that the problem of large alignment error between the center of the reference tooth groove of the internal spline and the center of the reference tooth of the external gear is solved, and the alignment error between the reference tooth groove of the external gear with a certain size section of the gear end surface and the reference tooth groove of the internal spline is ensured to be not more than 0.05mm. The processing method of the invention has simple and convenient operation, high manufacturing precision and centering precision of 0.05mm; the manufacturing cost of the tool setting template, the side plates and the positioning piece is low.
Drawings
FIG. 1 is a front view of a tool setting template and positioning member mounted on a synchronizing gear provided by an embodiment of the present invention;
FIG. 2 is a top view of a setting template and positioning member mounted on a synchronizing gear according to an embodiment of the present invention;
FIG. 3 is a side view of a setting template and positioning member mounted on a synchronizing gear provided by an embodiment of the present invention;
FIG. 4 is a front view of a positioning member provided by an embodiment of the present invention;
FIG. 5 is a half cross-sectional view of a positioning member provided by an embodiment of the present invention;
Fig. 6 is a side view of a positioning member provided by an embodiment of the present invention.
In the figure: 1. a synchronizing gear; 1-1, addendum circle; 1-2, inner holes; 2. setting a tool template; 2-1, a first pin hole; 2-2, a second pin hole; 2-3, a third pin hole; 2-4, a reference tooth socket; 2-5 parts of grooves; 2-6, a socket; 3. a pin; 4. a magnet; 5. a side plate; 5-1, a top cross bar; 5-2, a lower cross bar; 5-3, a vertical rod; 5-4, through holes; 6. a screw; 7. a positioning piece; 7-1, positioning columns; 7-1-1, a slot; 7-1-2, pin holes; 7-2, positioning plates; 7-2-1, notch; 8. and (5) positioning pins.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Examples
Referring to fig. 1 to 6, the present embodiment provides a method for centering internal splines of a synchronous gear of a rotary hub flying shear, which includes the following steps:
S1, placing the synchronous gear 1 on a gear shaper support, aligning the end face of the synchronous gear 1 with the addendum circle 1-1, and clamping the synchronous gear 1, wherein the error is not more than 0.02 mm.
S2, placing the tool setting template 2 on the upper end face of the synchronous gear 1, wherein a groove 2-5 is formed in one side of the bottom face of the tool setting template 2, and a magnet 4 is placed in the groove 2-5 so as to fix the tool setting template 2 on the synchronous gear 1; three pin holes which are arranged in an isosceles triangle are formed in the tool setting sample plate 2, a pin hole is further formed in the middle line of the bottom edge of the isosceles triangle, the pin holes at the two bottom corners of the isosceles triangle are marked as first pin holes 2-1, the pin holes at the top corners of the isosceles triangle are marked as second pin holes 2-2, the pin holes in the middle line of the bottom edge are marked as third pin holes 2-3, and a reference tooth slot 2-4 is formed in the middle of the tool setting sample plate 2 on the middle line and located on the circumference of the inner hole 1-2 of the synchronous gear 1. Respectively inserting pins 3 into two first pin holes 2-1 on the tool setting template 2, so that the two pins 3 are tightly attached to the inner holes 1-2 of the synchronous gear 1; the second pin hole 2-2 and the third pin hole 2-3 are also inserted with the pin 3.
S3, the side plates 5 are of a 'dry' structure and comprise an upper cross rod 5-1, a lower cross rod 5-2 and a vertical rod 5-3, the distance between the upper cross rod 5-1 and the lower cross rod 5-2 is larger than or equal to the thickness of the tool setting template 2, threaded holes penetrating up and down are formed in two sides of the lower cross rod 5-2, a screw 6 is arranged in each threaded hole, the tool setting template 2 is provided with a socket 2-6 on the side connected with the side plates 5, the width of the socket 2-6 is equal to the width of the vertical rod 5-3, the top of the side plates 5 is spliced with the tool setting template 2 at the socket 2-6, and the side plates 5 and the tool setting template 2 are fastened through the screws 6, so that the connection and the disassembly of the side plates 5 and the tool setting template 2 are convenient.
The positioning piece 7 comprises a positioning column 7-1 and a positioning plate 7-2, a through hole 5-4 is formed in the middle of the bottom of the side plate 5, the side plate 5 is in interference fit connection with one end of the positioning column 7-1 at the position of the through hole 5-4, a slot 7-1-1 and a pin hole 7-1-2 are formed in the other end of the positioning column 7-1, and the positioning plate 7-2 and the positioning column 7-1 are inserted in the slot 7-1-1 and fixed through a positioning pin 8 penetrating through the pin hole 7-1-2; the positioning plate 7-2 is provided with a notch 7-2-1, the shape of the notch 7-2-1 is matched with the shape of the external gear reference tooth of the synchronous gear 1, and the center line of the notch 7-2-1 and the center line of the bottom edge on the tool setting template 2 are on the same vertical plane.
The bottom of the side plate 5 is fixedly connected with the positioning piece 7, the notch 7-2-1 side of the positioning plate 7-2 is inserted onto the external gear reference tooth, the positioning plate 7-2 is tightly pressed against the external gear reference tooth by force, and the top of the side plate 5 is fixedly connected with the tool setting template 2; the tool setting template 2 and the positioning piece 7 can be well connected into a whole through the side plate 5, so that centering and alignment are convenient.
S4, checking whether the central lines of the two pins 3 in the second pin hole 2-2 and the third pin hole 2-3 are aligned with the central line of the external gear reference tooth by using a dial indicator on the tool setting template 2 by pulling a dial indicator back and forth, and if the difference between the table values is not more than 0.01mm, aligning the centers of the reference tooth grooves 2-4 of the tool setting template 2 with the centers of the external gear reference tooth at the moment; if the mutual difference of the table values is larger than 0.01mm, the workbench of the gear shaper is finely adjusted, so that the central lines of two pins 3 in the second pin hole 2-2 and the third pin hole 2-3 on the tool setting template 2 are consistent with the feeding direction of the gear shaper;
S5, aligning the cutter teeth of the gear shaping cutter according to the reference tooth grooves 2-4 on the cutter setting template 2, so that the centers of the cutter teeth of the gear shaping cutter are consistent with the centers of the reference tooth grooves 2-4 on the cutter setting template 2 (namely, the cutter teeth of the gear shaping cutter are uniformly contacted with two sides of the reference tooth grooves 2-4 of the cutter setting template 2); if the tooth positions are inconsistent, continuously adjusting the cutter teeth of the gear shaping cutter until the center of the cutter teeth of the gear shaping cutter is consistent with the center of the reference tooth grooves 2-4 on the cutter setting template 2;
For a common gear shaper, if the gear shaper is inconsistent (or uneven), the gear dividing change gear C and the gear D are separated, then the gear shaper cutter is independently adjusted, so that the cutter teeth of the gear shaper cutter are uniformly contacted with the two sides of the reference tooth grooves 2-4 of the tool setting template 2, and then the gear dividing change gear is hung again. For the intelligent gear shaping machine, if the deviation is inconsistent (or nonuniform), the deviation is recorded and transmitted to a control program, so that the automatic adjustment of the deviation is realized to ensure that the cutter teeth of the gear shaping cutter are uniformly contacted with the two sides of the reference tooth grooves 2-4 of the cutter setting template 2.
And S6, after the alignment adjustment is completed, the tool setting template 2 and the positioning plate 7-2 are taken down, and the internal spline can be inserted, so that the requirement on alignment precision can be met.
Specifically, the tool setting template 2 is of a Y-shaped structure, and is more convenient to install and adjust.
In summary, the center line of the external gear reference tooth is aligned by using the tool setting template 2 and the positioning piece 7, the tool is set according to the reference tooth groove 2-4 on the tool setting template 2, and the internal spline is inserted, so that the problem of large centering error between the center of the reference tooth groove 2-4 of the internal spline and the center of the external gear reference tooth is solved, and the centering error between the reference tooth of the external gear with a certain size section of the gear end surface and the reference tooth groove 2-4 of the internal spline is ensured to be not more than 0.05mm. The processing method of the invention has simple and convenient operation, high manufacturing precision and centering precision of 0.05mm; the tool setting template 2, the side plates 5 and the positioning piece 7 are low in manufacturing cost.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the invention in any way, but any simple modification, equivalent variation and modification of the above embodiments according to the technical principles of the present invention are within the scope of the technical solutions of the present invention.
Claims (5)
1. The method for centering the internal spline of the rotary hub flying shear synchronous gear is characterized by comprising the following steps of:
s1, placing a synchronous gear on a gear shaper support, aligning according to the end face and the addendum circle of the synchronous gear, and clamping the synchronous gear, wherein the error is not more than 0.02 mm;
S2, placing the tool setting template on the upper end face of the synchronous gear, and respectively inserting pins into the two first pin holes on the tool setting template to enable the two pins to be tightly attached to the inner holes of the synchronous gear; the tool setting template is provided with three pin holes which are arranged in an isosceles triangle, a pin hole is further formed in the middle line of the bottom edge of the isosceles triangle, the pin holes at the two bottom corners of the isosceles triangle are marked as first pin holes, the pin holes at the top corners of the isosceles triangle are marked as second pin holes, the pin holes in the middle line of the bottom edge are marked as third pin holes, and pins are inserted into the second pin holes and the third pin holes; a reference tooth slot is formed in the middle of the tool setting sample plate on the center line and on the circumference of the inner hole of the synchronous gear;
S3, connecting and fixing the bottom of the side plate and a positioning piece, wherein the positioning piece comprises a positioning plate, a notch is formed in the positioning plate, the shape of the notch is matched with the shape of an external gear reference tooth of a synchronous gear, and the center line of the notch and the center line of the bottom edge on a tool setting template are on the same vertical plane; inserting the notch side of the positioning plate onto the external gear reference tooth, forcibly pushing to ensure that the positioning plate is tightly close to the external gear reference tooth, and connecting and fixing the top of the side plate with the tool setting template; the side plates are of a 'dry' structure and comprise an upper cross rod, a lower cross rod and a vertical rod, the distance between the upper cross rod and the lower cross rod is larger than or equal to the thickness of the tool setting sample plate, threaded holes which are vertically penetrated are formed in two sides of the lower cross rod, a screw is arranged in each threaded hole, the tool setting sample plate is provided with a socket on the side connected with the side plates, the width of the socket is equal to that of the vertical rod, and the top of the side plate is spliced with the tool setting sample plate at the socket and fastened through the screw;
s4, checking whether the center lines of the two pins in the second pin hole and the third pin hole are aligned with the center line of the external gear reference tooth by using a dial indicator on the tool setting template by pulling a dial indicator back and forth, and if the difference between the table values is not more than 0.01mm, aligning the center of the reference tooth slot of the tool setting template with the center of the external gear reference tooth at the moment; if the mutual difference of the gauge values is larger than 0.01mm, the workbench of the gear shaper is finely adjusted, so that the central lines of two pins in the second pin hole and the third pin hole on the tool setting template are consistent with the feeding direction of the gear shaper;
S5, aligning the cutter teeth of the gear shaping cutter according to a reference tooth slot on a cutter aligning sample plate, so that the center of the cutter teeth of the gear shaping cutter is consistent with the center of the reference tooth slot on the cutter aligning sample plate; if the tooth positions are inconsistent, continuously adjusting the cutter teeth of the gear shaping cutter until the cutter tooth centers of the gear shaping cutter are consistent with the center of the reference tooth slot on the cutter setting template;
and S6, after the alignment adjustment is completed, the tool setting template and the positioning plate are taken down, and the internal spline can be inserted.
2. The method for centering the internal spline of the synchronous gear of the rotary hub flying shear according to claim 1, wherein a groove is formed in one side of the bottom surface of the tool setting template, and a magnet is placed in the groove.
3. The method for centering the internal spline of the synchronous gear of the rotary hub flying shear according to claim 1, wherein the tool setting template is of a Y-shaped structure.
4. The method for centering the internal spline of the rotary hub flying shear synchronous gear according to claim 1, wherein a through hole is formed in the middle of the bottom of the side plate, and the side plate is in interference fit connection with one end of the positioning piece at the through hole.
5. The method for centering the internal spline of the rotary hub flying shear synchronous gear according to claim 1, wherein the positioning piece further comprises a positioning column, one end of the positioning column is connected with the side plate, the other end of the positioning column is provided with a slot and a pin hole, and the positioning plate and the positioning column are inserted in the slot and fixed through a positioning pin penetrating through the pin hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111393645.2A CN114211310B (en) | 2021-11-23 | 2021-11-23 | Centering processing method for internal spline of rotary hub flying shear synchronous gear |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111393645.2A CN114211310B (en) | 2021-11-23 | 2021-11-23 | Centering processing method for internal spline of rotary hub flying shear synchronous gear |
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| CN114211310A CN114211310A (en) | 2022-03-22 |
| CN114211310B true CN114211310B (en) | 2024-05-07 |
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| US20080102966A1 (en) * | 2006-10-27 | 2008-05-01 | Torvec, Inc. | Spherical Universal Coupling |
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| CN203316849U (en) * | 2013-07-11 | 2013-12-04 | 重庆神箭汽车传动件有限责任公司 | Multi-gear gear-shaping fast locating tool |
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| CN114211310A (en) | 2022-03-22 |
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