CN113145910B - Method for processing blind key groove on workpiece - Google Patents
Method for processing blind key groove on workpiece Download PDFInfo
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- CN113145910B CN113145910B CN202110232667.4A CN202110232667A CN113145910B CN 113145910 B CN113145910 B CN 113145910B CN 202110232667 A CN202110232667 A CN 202110232667A CN 113145910 B CN113145910 B CN 113145910B
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- positioning sleeve
- inner hole
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- 238000012545 processing Methods 0.000 title abstract description 12
- 238000000034 method Methods 0.000 title abstract description 10
- 238000005520 cutting process Methods 0.000 claims abstract description 22
- 238000003825 pressing Methods 0.000 claims description 21
- 238000003754 machining Methods 0.000 claims description 15
- 230000007246 mechanism Effects 0.000 claims description 9
- 238000003672 processing method Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000005304 joining Methods 0.000 claims 3
- 238000009749 continuous casting Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 241000227425 Pieris rapae crucivora Species 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
- B23C3/28—Grooving workpieces
-
- 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
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
- B23Q5/22—Feeding members carrying tools or work
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
- Turning (AREA)
Abstract
The invention discloses a method for processing blind key grooves on a workpiece, which comprises the following steps: s1, installing a workpiece on a guide device; the cutter bar provided with the cutting tool is matched with the cutter bar guide post, and the cutter bar guide post is matched with the guide device; s3, the cutter bar is controlled by the numerical control machine tool to feed the workpiece along the radial direction each time with the dimension D; s4, under the control of the numerical control machine tool, the cutter bar is fed once in the axial direction, the cutter bar is retracted to the initial position of axial feeding, the steps S3 and S4 are repeated to cut the workpiece, and a blind key groove formed by a key groove body and a cutter retracting groove is processed on the workpiece; the method of the invention can form a blind key slot in a novel tool withdrawal mode.
Description
Technical Field
The invention relates to the technical field of key slot machining, in particular to a method for machining blind key slots on a workpiece.
Background
The continuous casting roller is a main part of a continuous casting machine, and the roller sleeve type continuous casting roller assembly assembles 2-4 roller sleeves into a roller assembly through a mandrel and a key. The quality of the dimensional accuracy and the position accuracy of the roller sleeve key groove is a key factor for ensuring the assembly to be assembled smoothly.
The project is a Bao steel No. 2 continuous casting transformation project, the project continuous casting machine is an Olympic steel PT technology, the structural form of the roller is a roller sleeve type, and three sections of roller sleeves are assembled into groups in a small gap mode. The key grooves in the inner holes of the roller sleeves at the two ends are blind key grooves, and the key grooves in the inner holes of the roller sleeves in the middle are through key grooves.
The key groove in the inner hole of the evaluation roll sleeve is processed and formed by adopting a common B5050 slotting machine, adopting linear reciprocating motion and adopting a common white steel blade; the conventional processing mode has the following defects:
1. conventional machining requires multiple machining passes in width due to the influence of the tool;
2. as the key groove size precision of the product is generally Js9, the symmetry requirement is generally within 0.05, and the conventional processing has certain difficulty;
3. due to the equipment factor, the linear reciprocating motion machining is required to design a special annular tool retracting groove 9 at the bottom of the key groove 5. The requirement of a special tool retracting groove 9 (as shown in fig. 10) is met, so that the production cost is high, the processing time is long, and the strength of a product is reduced.
4. Although the cutting tool can be separated and broken by the annular tool retracting groove 9, a part of broken chips remain in the tool retracting groove 9 during processing, and the cutting tool is easily contacted with the broken chips during processing, so that the problem of cutting edge jumping is caused.
Disclosure of Invention
The invention provides a method for processing blind key grooves on a workpiece in a novel tool withdrawal mode.
The processing method of the blind key groove on the workpiece comprises the following steps:
s1, installing a workpiece on a guide device;
s2, matching a cutter bar provided with a cutting tool with a cutter bar guide column, wherein the cutter bar guide column is matched with a guide device;
s3, the cutter bar is controlled by the numerical control machine tool to feed the workpiece along the radial direction each time with the dimension D;
s4, the cutter bar is controlled by the numerical control machine tool to enable the cutter to feed along the axial direction of the workpiece according to the following formula, the cutter bar is retracted to the initial position of axial feeding once in each axial feeding, the steps S3 and S4 are repeated to cut the workpiece, and a blind key groove consisting of a key groove body and a cutter retracting groove is processed on the workpiece;
L0＝L+L1-(n-1)×d
in the above formula, H1 is the machining depth of the key slot body, N is the total cutting times, L0 is the axial feeding dimension of the workpiece at each time, L is the machining length of the key slot body along the axial direction of the workpiece, L1 is the machining length of the relief slot along the axial direction of the workpiece, N is the natural number corresponding to the cutting between the 1 st time and the nth time, and d is the difference value of any two adjacent axial feeding.
The invention has the following advantages:
1. the form of a conventional radial annular tool retracting groove is changed, and the tool retracting groove with an inclined arc surface is simultaneously processed in the process of processing the key groove body, and the tool retracting groove with the structure is in a novel tool retracting form;
2. the requirement of lathe processing of radial annular cutter withdrawal grooves is eliminated, a novel cutter withdrawal structure is formed by adopting a numerical control approximate broaching processing mode, and meanwhile, a blind key groove formed by a key groove body and the cutter withdrawal grooves is processed, so that the method has the advantages of time saving and high production efficiency;
3. the forming blade is adopted, the cutting amount is small (the conventional feeding is 0.03-0.05 mm each time), the product size precision and the roughness are ensured in a rapid cutting mode, and the phenomenon that the cutting tool jumps to the edge can be avoided;
4. the invention changes the way of aligning the outer circle or the inner hole of the product and the lateral generatrix of the original slotting machine, and ensures the way of the requirements of the straightness and the symmetry of the key slot.
Drawings
FIG. 1 is a cross-sectional view of a guide device in accordance with the present invention;
FIG. 2 is a perspective view of a guide device according to the present invention;
FIG. 3 is a schematic view of an upper spacer sleeve;
FIG. 4 is a schematic view of a lower spacer sleeve;
FIG. 5 is an enlarged view of section I of FIG. 1;
FIG. 6 is a schematic illustration of a first blind keyway formed using the method of the present invention;
fig. 7 is an enlarged view of the portion P in fig. 6;
FIG. 8 is a schematic illustration of a second blind keyway formed using the method of the present invention;
fig. 9 is an enlarged view of the Q part in fig. 8;
FIG. 10 is a schematic illustration of a keyway in a roller sleeve of the prior art;
the reference symbols in the drawings:
work piece a, upper locating sleeve 1, first breach 1a that gives way, first terminal surface joint component 1b, first hole joint portion 1c, first centre bore 1d, lower locating sleeve 2, second breach 2a that gives way, second terminal surface joint component 2b, second hole joint portion 2c, second centre bore 2d, actuating mechanism 3, clamp plate 4, keyway body 5, top cap 6, spacing portion 6a, first pilot hole 6b, second pilot hole 6c, adjustment pad 7, locking screw 8, withdrawal groove 9, cutting tool 10, cutter arbor guide post 11, slip fit groove 11a, cutter arbor 12.
Detailed Description
The invention will be described in detail with reference to fig. 1 to 9.
The workpiece A processed in this embodiment preferably uses a roll sleeve, an inner hole on the roll sleeve is a through hole, that is, a key slot is processed on the hole wall surface of the inner hole of the workpiece A, and the key slot is a blind key slot.
The processing method of the blind key groove on the workpiece comprises the following steps:
s1, installing a workpiece A on a guide device; the guiding device comprises: the device comprises an upper positioning sleeve 1 in clearance fit with one end of an inner hole of a workpiece A, a lower positioning sleeve 2 in clearance fit with the other end of the inner hole of the workpiece A and a compression assembly, wherein a first yielding gap 1a for a cutter bar 12 to move radially along the upper positioning sleeve 1 is arranged on the upper positioning sleeve 1; the lower locating sleeve 2 is provided with a second yielding gap 2a for the cutter bar 12 to move along the radial direction of the lower locating sleeve 2, and the pressing component is matched with the upper locating sleeve 1 to locate the workpiece between the upper locating sleeve 1 and the lower locating sleeve 2.
The upper positioning sleeve 1 comprises a first end face combining part 1b and a first inner hole combining part 1c which are in abutting connection with the axial end face of the workpiece, the first yielding gap 1a is arranged on the first end face combining part 1b, and the first inner hole combining part 1c is connected with one end of the first end face combining part 1 b. The first end surface combining part 1b is provided with a first central hole 1d, the first central hole 1d is used for the cutter bar 12 to pass through, and the first yielding notch 1a is communicated with the first central hole 1 d. The first inner hole joint portion 1c is cylindrical or conical, and in this embodiment, the first inner hole joint portion 1c is cylindrical.
The lower positioning sleeve 2 comprises a second end surface combining part 2b and a second inner hole combining part 2c which are in abutting joint with the axial end surface of the workpiece, and a second abdication notch 2a is arranged on the second end surface combining part 2 b; the second inner hole combining part 2c is connected with one end of the second end surface combining part 2b, a second central hole 2d is arranged on the second end surface combining part 2b, the second central hole 2d is used for the cutter bar 12 to pass through, and the second abdication notch 2a is communicated with the second central hole 2 d. The second inner hole junction 2c is cylindrical or conical, and in this embodiment, the second inner hole junction 2c is cylindrical.
The pressing assembly comprises a driving mechanism 3, a pressing plate 4 and at least three jacking assemblies, the pressing plate 4 is fixed with the driving mechanism 3, one end of each jacking assembly is connected with one end of the pressing plate 4 facing the upper locating sleeve 1, and the other end of each jacking assembly is a free end matched with the upper locating sleeve 1. The driving mechanism 3 consists of an air cylinder and a mounting plate, the power output end of the air cylinder is fixedly connected with the mounting plate, the air cylinder can be replaced by a hydraulic cylinder, the pressing plate 4 is connected with the mounting plate, mounting holes are formed in the pressing plate 4, and screws penetrate through the mounting holes in the pressing plate 4 to be connected with the mounting plate, so that the pressing plate 4 and the mounting plate in the driving mechanism 3 are fixed into a whole. In this embodiment, three tightening assemblies are adopted, and the central connecting lines of the three tightening assemblies form a triangle, so that the stress of the pressing plate 4 is uniform and stable. When the driving mechanism 3 performs feeding, the driving mechanism 3 pushes the pressing plate 4 to feed, so that the propping assembly moves towards the positioning sleeve 1, and finally the propping assembly and the positioning sleeve 1 form propping, so that the positioning sleeve 1 is tightly pressed on the end face of the workpiece A.
The jacking component comprises a top cap 6, one or more adjusting pads 7 and a locking screw 8, wherein an assembly hole is formed in the top cap 6, a limiting part 6a with a through hole is arranged in the assembly hole, and the limiting part 6a divides the assembly hole into a first assembly hole 6b and a second assembly hole 6c; the adjusting pad 7 is used for adjusting the interval between the top cap 6 and the pressing plate 4, one end of the adjusting pad 7 abuts against the limiting part 6a, the other end of the adjusting pad 7 abuts against the pressing plate 4, one end of the locking screw 8 penetrates through the through hole in the limiting part 6a and then is connected with the pressing plate 4, the locking screw 8 is limited by the limiting part 6a, and one part of the locking screw 8 is located in the second assembly hole 6 c. In this embodiment, be equipped with the blind hole on the clamp plate 4, the one end of top cap 6 is located the blind hole, has installed the adjustment pad 7 in first pilot hole 6b after for form the interval between top cap 6 and clamp plate 4, the adjustment pad 7 preferably adopts the dish spring, and quantity is 2 to 3, has the effect of deformation volume through the adjustment pad 7, can solve the uneven phenomenon of atress of 3 top caps 6 that the perpendicular error of the hole of machining process work piece A and axial face terminal surface leads to indirectly.
For the matching of the guide device with the workpiece A and the cutter bar guide post 11, the inner hole of the workpiece A is respectively positioned with the outer circles of the upper positioning sleeve 1 and the lower positioning sleeve 2 in the guide device in a small clearance fit (or taper self-centering) manner, the first central hole 1d and the second central hole 2d are positioned with the outer peripheral surface of the cutter bar group rod in a small clearance manner, so that the positioning based on the dimensional precision and the form and position tolerance of the inner hole is formed, and the requirements of the straightness and symmetry of the key groove are ensured.
By adopting the guiding device with the structure, the cutter bar guiding column 11 can be prevented from being positioned by bolts, the cutter bar guiding column 11 is convenient to guide and position, and the pressing assembly directly presses the upper positioning sleeve 1, so that the workpiece A is clamped between the upper positioning sleeve 1 and the lower positioning sleeve 2, and the workpiece A is convenient to position.
S2, enabling a cutter bar 12 provided with a cutting tool 10 to be matched with a cutter bar guide post 11, and enabling the cutter bar guide post 11 to be matched with a guide device; preferably, a sliding fit groove 11a is provided on the cutter bar guide 11, and the cutter bar 12 is slidably fitted with the sliding fit groove 11a, so that since the cutter bar guide 11 is fixed and the cutter bar 12 is movable, the cutter bar guide 11 is fitted with the upper and lower positioning bushes 1 and 2, and thus, the accuracy of movement of the cutter bar 12 can be ensured during cutting. The cutting tool 10 is fixedly connected with the tool bar 12, and in the cutting process, the tool bar 12 is firstly fed along the radial direction of the first yielding gap 1a and the second yielding gap 2a, and then fed along the axial direction of the workpiece A, so that the workpiece can be cut. The cutting tool 10 is formed by one-step forming in the width direction of the key groove so as to satisfy the dimensional accuracy of the product.
S3, the cutter bar 12 is controlled by a numerical control machine tool to feed the workpiece along the radial direction each time, wherein the value of D is 0.02-0.05mm;
s4, the cutter bar 12 enables the cutter to feed along the axial direction of the workpiece according to the following formula under the control of the numerical control machine tool, the cutter bar returns to the initial position of axial feeding once in every axial feeding, the steps S3 and S4 are repeated to cut the workpiece, and a blind key groove consisting of the key groove body 5 and the cutter withdrawal groove 9 is processed on the workpiece.
L0＝L+L1-(n-1)×d
In the above formula, H1 is the machining depth of the key slot body, N is the total cutting times, L0 is the axial feeding dimension of the workpiece at each time, L is the machining length of the key slot body along the axial direction of the workpiece, L1 is the machining length of the relief slot 9 along the axial direction of the workpiece, N is the natural number corresponding to the cutting between the 1 st time and the nth time, and d is the difference value of any two adjacent axial feeding.
The groove bottom surface 9a of the tool retracting groove 9 processed according to the steps S3 and S4 is an inclined surface or an arc surface, wherein an included angle alpha formed by the inclined surface and the axial direction of the workpiece is 20-30 degrees. The cutting is implemented by a numerical control broaching machine and has a radial feeding dimension of small feeding, namely, the dimension D of each radial feeding is 0.02-0.05mm, so that the requirement of forming an approximate inclined plane or arc-shaped surface relief groove 9 by numerical control approximate broaching is ensured, and the roughness of a product is ensured.
The foregoing description of the exemplary embodiments of the invention is not intended to limit the scope of the invention, and any equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the invention should be considered as falling within the scope of the invention.
Claims (1)
1. The processing method of the blind key groove on the workpiece is characterized by comprising the following steps of:
s1, installing a workpiece on a guide device;
s2, matching a cutter bar provided with a cutting tool with a cutter bar guide column, wherein the cutter bar guide column is matched with a guide device;
s3, the cutter bar is controlled by the numerical control machine tool to feed the workpiece along the radial direction each time with the dimension D;
s4, the cutter bar is controlled by the numerical control machine tool to enable the cutter to feed along the axial direction of the workpiece according to the following formula, the cutter bar is retracted to the initial position of axial feeding once in each axial feeding, the steps S3 and S4 are repeated to cut the workpiece, and a blind key groove consisting of a key groove body and a cutter retracting groove is processed on the workpiece;
L0＝L+L1-(n-1)×d
in the above formula, H1 is the machining depth of the key slot body, N is the total cutting times, L0 is the axial feeding dimension of the workpiece at each time, L is the machining length of the key slot body along the axial direction of the workpiece, L1 is the machining length of the relief slot along the axial direction of the workpiece, N is the natural number corresponding to the cutting between the 1 st time and the nth time, and d is the difference value of any two adjacent axial feeding;
the bottom surface of the tool retracting groove processed according to the steps S3 and S4 is an inclined surface or an arc surface, and an included angle alpha formed by the inclined surface and the axial direction of the workpiece is 20-30 degrees;
the guiding device comprises: the upper positioning sleeve (1) is in clearance fit with one end of the inner hole of the workpiece, and a first abdication notch (1 a) for the cutter bar to move along the radial direction of the upper positioning sleeve (1) is arranged on the upper positioning sleeve (1);
the lower locating sleeve (2) is in clearance fit with the other end of the inner hole of the workpiece, and a second abdication notch (2 a) for radially moving the cutter bar along the lower locating sleeve (2) is arranged on the lower locating sleeve (2);
the upper positioning sleeve (1) comprises: a first end surface bonding part (1 b) which is abutted against the axial end surface of the workpiece, wherein the first yielding gap (1 a) is arranged on the first end surface bonding part (1 b);
a first inner hole joining portion (1 c), the first inner hole joining portion (1 c) being connected to one end of the first end face joining member (1 b);
the lower locating sleeve (2) comprises: a second end surface combining part (2 b) which is abutted against the axial end surface of the workpiece, wherein the second yielding notch (2 a) is arranged on the second end surface combining part (2 b);
a second inner hole joint part (2 c), wherein the second inner hole joint part (2 c) is connected with one end of the second end surface joint part (2 b);
the guiding device is matched with the workpiece (A) and the cutter bar guiding column (11), wherein the inner hole of the workpiece (A) is respectively matched with the outer circles of the upper positioning sleeve (1) and the lower positioning sleeve (2) in the guiding device in a small clearance mode to be positioned, and the first central hole (1 d) and the second central hole (2 d) are positioned with the outer peripheral surface of the cutter bar guiding column (11) in a small clearance mode to form positioning based on the dimensional precision and the form and position tolerance of the inner hole;
the pressing component is matched with the upper locating sleeve (1) to locate the workpiece between the upper locating sleeve (1) and the lower locating sleeve (2);
the compression assembly includes: a driving mechanism (3);
the pressing plate (4), the pressing plate (4) is fixed with the driving mechanism (3);
one end of each jacking component is connected with one end of the upward-facing positioning sleeve (1) of the pressing plate (4), and the other end of the jacking component is a free end matched with the upper positioning sleeve (1);
the tight subassembly in top includes: a top cap (6), wherein the top cap (6) is provided with an assembly hole, a limiting part (6 a) with a through hole is arranged in the assembly hole, and the limiting part (6 a) divides the assembly hole into a first assembly hole (6 b) and a second assembly hole (6 c);
one end of the adjusting pad (7) is propped against the limiting part (6 a), and the other end of the adjusting pad (7) is propped against the pressing plate (4);
the locking screw (8), one end of the locking screw (8) passes through the through hole on the limit part (6 a) and then is connected with the pressing plate (4);
the locking screw (8) is spacing by spacing portion (6 a), and part of locking screw (8) is located second pilot hole (6 c), be equipped with the blind hole on clamp plate (4), the one end of top cap (6) is located the blind hole, has installed in first pilot hole (6 b) after adjusting pad (7) for form the interval between top cap (6) and clamp plate (4), adjusting pad (7) adopt the dish spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110232667.4A CN113145910B (en) | 2021-03-03 | 2021-03-03 | Method for processing blind key groove on workpiece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110232667.4A CN113145910B (en) | 2021-03-03 | 2021-03-03 | Method for processing blind key groove on workpiece |
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| Publication Number | Publication Date |
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| CN113145910A CN113145910A (en) | 2021-07-23 |
| CN113145910B true CN113145910B (en) | 2023-12-22 |
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| CN202110232667.4A Active CN113145910B (en) | 2021-03-03 | 2021-03-03 | Method for processing blind key groove on workpiece |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000024830A (en) * | 1998-07-15 | 2000-01-25 | Toshiba Corp | Key groove machining device |
| CN105479179A (en) * | 2016-01-27 | 2016-04-13 | 湖北铭程精密机械有限责任公司 | Precision blind hole key groove cutting machine |
| CN206614038U (en) * | 2017-04-06 | 2017-11-07 | 南京农业大学 | The easy device of keyway is processed on a kind of lathe |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6942438B1 (en) * | 2001-04-26 | 2005-09-13 | Scott L. Deguise | Keyway cutter tool and method |
| RU2220824C1 (en) * | 2002-05-27 | 2004-01-10 | Закрытое акционерное общество "Корпорация ФЭД" | Method for making dead grooves in opening of part of hydraulic distributor |
| EP2537615B1 (en) * | 2011-06-21 | 2014-11-26 | Klingelnberg AG | Robust method for skiving |
| CN102699442B (en) * | 2012-05-22 | 2013-12-18 | 湖北铭程精密机械有限责任公司 | Precision cutting head for inner-hole keyways |
| KR101588301B1 (en) * | 2014-03-17 | 2016-01-25 | 김선삼 | Injection Mold of Rib Fomation Apparatus |
| CN206925532U (en) * | 2017-07-19 | 2018-01-26 | 黄石联瑞机械科技股份有限公司 | A kind of elastic presser feet |
| CN108145187B (en) * | 2017-11-28 | 2019-08-02 | 中国航发西安动力控制科技有限公司 | For processing the axial cutter and processing technology for being evenly distributed with Internal Spherical Surface slot |
| CN108044547A (en) * | 2018-01-31 | 2018-05-18 | 河南省西峡汽车水泵股份有限公司 | A kind of water pump casing for vehicle cramp for verifying and checking |
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2021
- 2021-03-03 CN CN202110232667.4A patent/CN113145910B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000024830A (en) * | 1998-07-15 | 2000-01-25 | Toshiba Corp | Key groove machining device |
| CN105479179A (en) * | 2016-01-27 | 2016-04-13 | 湖北铭程精密机械有限责任公司 | Precision blind hole key groove cutting machine |
| CN206614038U (en) * | 2017-04-06 | 2017-11-07 | 南京农业大学 | The easy device of keyway is processed on a kind of lathe |
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