CN114905280B - High-precision intermittent slender blind shaft hole machining device and machining method - Google Patents
High-precision intermittent slender blind shaft hole machining device and machining method Download PDFInfo
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- CN114905280B CN114905280B CN202210124052.4A CN202210124052A CN114905280B CN 114905280 B CN114905280 B CN 114905280B CN 202210124052 A CN202210124052 A CN 202210124052A CN 114905280 B CN114905280 B CN 114905280B
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- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/02—Machine tools for performing different machining operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
The invention belongs to the technical field of machining, and particularly relates to a high-precision intermittent slender blind shaft hole machining device and a machining method. Comprises a guide clamp and a guide cutter; the guide clamp is arranged on the workbench; the guiding cutter is arranged on the cutter library; the guide clamp comprises a guide wall and a clamp bottom plate; the guide wall is positioned on the clamp bottom plate through a guide wall positioning pin and is fixed on the clamp bottom plate through a mounting screw; the guiding cutter comprises a guiding lengthened drill bit, a guiding lengthened reamer and a guiding lengthened reamer. The invention adopts a guiding processing method, firstly adopts a conventional cutter and a conventional method to process the front end hole of the long shaft hole to meet the requirements, and then guides the cutter to process the rear end hole of the long shaft hole by the processed front end hole and the guide hole of the guide wall. Due to the guiding of the guide wall, the cutter can inhibit the traction of the inclined surface of the blank of the long shaft hole at the rear end to ensure the position degree and the coaxiality, and the cutter is stable during guiding to avoid vibration to ensure the diameter and the roughness.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a high-precision intermittent slender blind shaft hole machining device and a machining method.
Background
Because the long shaft hole is a blind hole, the length and diameter ratio is large, the middle part of the hole is a cavity, and the requirements on the diameter, the position, the coaxiality and the roughness of the hole are extremely high, so that the processing difficulty is realized. The existing processing method directly adopts an lengthened cutter to carry out rough processing, semi-finish processing and finish processing, and when the cutter is overlong and encounters the inclined surface of a blank of a long shaft hole at the rear end, the cutter is pulled by the cutter to cause the out-of-tolerance of position and coaxiality, and the cutter has the length-diameter ratio of large and low strength and generates vibration to cause the out-of-tolerance of diameter and roughness.
Disclosure of Invention
The invention provides a high-precision intermittent slender blind shaft hole machining device and a machining method, which can meet the precision requirement after machining by adopting a guiding machining method, and solve the problems existing in the existing blind shaft hole machining.
The technical scheme of the invention is as follows in combination with the accompanying drawings:
a high-precision intermittent slender blind shaft hole machining device comprises a guide clamp and a guide cutter 2; the guide clamp is arranged on the workbench; the guiding cutter is arranged on the cutter library; the guide clamp comprises a guide wall 1 and a clamp bottom plate 3; the guide wall 1 is positioned on the clamp bottom plate 3 through a guide wall positioning pin 12 and is fixed on the clamp bottom plate 3 through a mounting screw 13; the pilot cutter 2 includes a pilot extension drill bit 21, a pilot extension reamer 22, and a pilot extension reamer 23.
The upper end of the guide wall 1 is provided with a guide hole 11, a positioning hole for installing a guide wall positioning pin 12 and a mounting hole for installing a screw 13.
One end of the guide hole 11 is provided with a guide chamfer.
The pilot-extension drill 21, the pilot-extension reamer 22 and the pilot-extension reamer 23 comprise a cutting portion 24, a pilot portion 25 and a clamping portion 26; the pilot extension bit 21, pilot extension reamer 22 and pilot portion 25 of pilot extension reamer 23 are the same diameter.
The final bore allowance of the diameter of the cutting portion 24 of the pilot-extension bit 21 is 1-2mm; the final bore allowance of the diameter of the cutting portion 24 of the pilot elongated reamer 22 is 0.2mm-0.4mm; the diameter of the cutting portion 24 of the guide extension reamer 23 is the final aperture; the diameter of the clamping part 26 is the clamping diameter of a standard tool shank, and the diameter of the guiding part 25 is 0.005-0.01mm smaller than the diameter of the cutting part 24 of the guiding lengthened reamer 23.
The high-precision intermittent slender blind shaft hole machining method is realized by a high-precision intermittent slender blind shaft hole machining device and comprises the following steps of:
firstly, installing a guide wall 1 on a workbench, and inputting a zero point of a part machining coordinate system into numerical control equipment after alignment;
step two, after clamping the guide lengthened drill bit 21, the guide lengthened reamer 22 and the guide lengthened reamer 23 into a cutter handle, measuring lengths respectively, installing the lengths into a cutter warehouse, and inputting cutter length compensation into numerical control equipment;
step three, machining the diameter of the front section 41 of the intermittent slender blind shaft hole;
step four, guiding the lengthened drill bit 21 to enter the guide hole 11 through the front section 41 of the intermittent slender blind shaft hole at a feeding speed of 30r/min F1000, calculating a cutter rotating speed N at a linear speed of Vc=60 m/min before the blank of the rear section 42 of the intermittent slender blind shaft hole, calculating a feeding speed Vf at a feeding amount per rotation of fr=0.1 mm/r, processing the cutter rotating speed N to the bottom of the hole, and retracting the cutter to a safe height at a feeding speed of 30r/min F2000;
step five, guiding the lengthened reamer 22 to enter the guiding hole 11 through the front section 41 of the intermittent slender blind shaft hole at a feeding speed of 30r/min F1000, calculating a cutter rotating speed N at a linear speed of Vc=30m/min before the blank of the rear section 42 of the intermittent slender blind shaft hole, calculating a feeding speed vf=fz×Z×N at a feeding amount per tooth of fz=0.05mm/Z, machining the cutter to the bottom of the hole at a feeding speed Vf of 30r/min F2000, and retracting the cutter to a safe height;
step six, guiding the lengthened reamer 23 to enter the guiding hole 11 through the front section 41 of the intermittent slender blind shaft hole at a feeding speed of 30r/min F1000, calculating a cutter rotating speed N=Vc=318/D at a linear speed of Vc=20m/min before reaching the blank of the rear section 42 of the intermittent slender blind shaft hole, calculating a feeding speed vf=fz=Z×N at a feeding amount per tooth of fz=0.02 mm/Z, machining to the bottom of the hole at a feeding speed Vf of the cutter rotating speed N, retracting the cutter to a safe height at a feeding speed of 30r/min F2000, and finishing the machining of the intermittent slender blind shaft hole with high precision.
The diameter of the machining intermittent elongated blind shaft bore front section 41 is 0.005-0.01mm greater than the diameter of the cutting portion 24 of the pilot elongate reamer 23.
The method for calculating the rotating speed of the cutter in the fourth step comprises the following steps: n=vc×318/D, where Vc is linear velocity and D is tool diameter; the method for calculating the feed speed Vf comprises the following steps: vf=fr×n, where fr is the feed amount per revolution and N is the tool rotation speed.
The method for calculating the rotating speed of the cutter in the fifth step comprises the following steps: n=vc×318/D, where Vc is linear velocity and D is tool diameter; the method for calculating the feed speed Vf comprises the following steps: vf=fz×n, where fz is the feed per tooth, Z is the number of tool edges, and N is the tool rotation speed.
The method for calculating the rotating speed of the cutter in the step six is as follows: n=vc×318/D, where Vc is linear velocity and D is tool diameter; the method for calculating the feed speed Vf comprises the following steps: vf=fz×n, where fz is the feed per tooth, Z is the number of tool edges, and N is the tool rotation speed.
The beneficial effects of the invention are as follows:
1) The high-precision intermittent slender blind shaft hole machining device enables the guiding diameters of rough machining, semi-finishing and finishing guiding cutters to be the same, a guiding wall can be shared, a guiding fixture is designed and manufactured, the guiding wall is designed and installed on a positioning bottom plate, and cutter guiding can be carried out during rough machining, semi-finishing and finishing;
2) The invention adopts a guiding processing method, firstly adopts a conventional cutter and a conventional method to process the front end hole of the long shaft hole to meet the requirements, and then guides the cutter to process the rear end hole of the long shaft hole by the processed front end hole and the guide hole of the guide wall. Due to the guiding of the guide wall, the cutter can inhibit the traction of the inclined surface of the blank of the long shaft hole at the rear end to ensure the position degree and the coaxiality, and the cutter is stable during guiding to avoid vibration to ensure the diameter and the roughness.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural view of a high-precision intermittent elongated blind shaft hole machining device according to the invention;
FIG. 2 is a schematic view of a guiding tool in a high-precision intermittent elongated blind shaft hole machining device according to the present invention;
fig. 3 is a schematic structural view of a guiding tool in a high-precision intermittent elongated blind shaft hole processing device according to the present invention.
In the figure:
1. a guide wall;
11. a guide hole is formed;
12. installing a guide wall locating pin;
13. a screw;
2. guiding the cutter;
21. guiding the lengthened drill bit;
22. guiding the lengthened reamer;
23. guiding the lengthened reamer;
24. a cutting portion;
25. a guide portion;
26. a clamping portion;
3. a clamp base plate;
4. machining parts;
41. a discontinuous elongated blind shaft bore anterior segment;
42. the rear section of the elongated blind shaft hole is interrupted.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
Example 1
Referring to fig. 1 and 3, a high-precision intermittent slender blind shaft hole machining device comprises a guide clamp and a guide cutter 2; the guide clamp is arranged on the workbench; the guide tools are mounted on a tool magazine.
The guide clamp comprises a guide wall 1 and a clamp bottom plate 3; the guide wall 1 is positioned on the clamp bottom plate 3 through a guide wall positioning pin 12 and is fixed on the clamp bottom plate 3 through a mounting screw 13;
the upper end of the guide wall 1 is provided with a guide hole 11, a positioning hole for installing a guide wall positioning pin 12 and a mounting hole for installing a screw 13.
The clamp bottom plate 3 is provided with a part positioning hole and a guide wall positioning hole; the part positioning hole is used for positioning and processing the part 4; the guide wall positioning holes are used for positioning the guide wall 1.
One end of the guide hole 11 is provided with a guide chamfer.
Referring to fig. 2, the pilot cutter 2 includes a pilot extension bit 21, a pilot extension reamer 22, and a pilot extension reamer 23.
The pilot extension bit 21 is used to roughen intermittent elongated blind shaft holes.
The pilot elongated reamer 22 is used for semi-finishing intermittent elongated blind shaft bores.
The guide elongated reamer 23 is used to precision the intermittent elongated blind shaft bore.
The pilot extension bit 21, pilot extension reamer 22 and pilot extension reamer 23 include a cutting portion 24, a pilot portion 25 and a clamping portion 26.
The diameters of the guide lengthened drill bit 21, the guide lengthened reamer 22 and the guide part 25 of the guide lengthened reamer 23 are the same as phi 18.005, so that the three cutters can be machined by using the same guide fixture, and rough machining, semi-finishing machining and finishing machining can be finished by one-time clamping.
The diameter of the cutting part of the guide lengthened drill bit 21 is phi 16.5mm, the diameter of the cutting part of the guide lengthened reamer 22 is phi 17.8mm, the diameter of the cutting part 24 of the guide lengthened reamer 23 is phi 18.005mm, and the diameter of the clamping part 26 of the guide cutter 2 is the standard cutter handle clamping diameter.
The final bore allowance of the diameter of the cutting portion 24 of the pilot-extension bit 21 is 1-2mm; the final bore allowance of the diameter of the cutting portion 24 of the pilot elongated reamer 22 is 0.2mm-0.4mm; the diameter of the cutting portion 24 of the guide extension reamer 23 is the final aperture; the diameter of the clamping part 26 is the clamping diameter of a standard tool shank, and the diameter of the guiding part 25 is 0.005-0.01mm smaller than the diameter of the cutting part 24 of the guiding lengthened reamer 23.
Example two
The high-precision intermittent slender blind shaft hole machining method is realized by a high-precision intermittent slender blind shaft hole machining device and comprises the following steps of:
firstly, installing a guide wall 1 on a workbench, and inputting a zero point of a part machining coordinate system into numerical control equipment after alignment;
step two, after clamping the guide lengthened drill bit 21, the guide lengthened reamer 22 and the guide lengthened reamer 23 into a cutter handle, measuring lengths respectively, installing the lengths into a cutter warehouse, and inputting cutter length compensation into numerical control equipment;
step three, machining the diameter of the front section 41 of the intermittent slender blind shaft hole; the diameter of the machining intermittent elongated blind shaft bore front section 41 is 0.005-0.01mm greater than the diameter of the cutting portion 24 of the pilot elongate reamer 23.
Step four, guiding the lengthened drill bit 21 to enter the guide hole 11 through the front section 41 of the intermittent slender blind shaft hole at a feeding speed of 30r/min F1000, calculating a cutter rotating speed N at a linear speed of Vc=60 m/min before the blank of the rear section 42 of the intermittent slender blind shaft hole, calculating a feeding speed Vf at a feeding amount per rotation of fr=0.1 mm/r, processing the cutter rotating speed N to the bottom of the hole, and retracting the cutter to a safe height at a feeding speed of 30r/min F2000;
the calculation method of the cutter rotating speed comprises the following steps: n=vc×318/D, where Vc is linear velocity and D is tool diameter; the method for calculating the feed speed Vf comprises the following steps: vf=fr×n, where fr is the feed amount per revolution and N is the tool rotation speed.
Step five, guiding the lengthened reamer 22 to enter the guiding hole 11 through the front section 41 of the intermittent slender blind shaft hole at a feeding speed of 30r/min F1000, calculating a cutter rotating speed N at a linear speed of Vc=30m/min before the blank of the rear section 42 of the intermittent slender blind shaft hole, calculating a feeding speed vf=fz×Z×N at a feeding amount per tooth of fz=0.05mm/Z, machining the cutter to the bottom of the hole at a feeding speed Vf of 30r/min F2000, and retracting the cutter to a safe height;
the calculation method of the cutter rotating speed comprises the following steps: n=vc×318/D, where Vc is linear velocity and D is tool diameter; the method for calculating the feed speed Vf comprises the following steps: vf=fz×n, where fz is the feed per tooth, Z is the number of tool edges, and N is the tool rotation speed.
The lengthened reamer 23 is guided at a feed speed of 30r/min F1000, the cutter guide portion 25 is led into the guide hole 11 through the front section 41 of the intermittent long blind shaft hole until the blank of the rear section 42 of the intermittent long blind shaft hole, the cutter rotational speed n=vc=318/D is calculated at a linear speed of vc=20m/min, the feed speed vf=fz×z×n is calculated at a feed rate per tooth of fz=0.02 mm/Z, the cutter is machined to the bottom of the hole at the cutter rotational speed N feed speed Vf, and the cutter is retracted to a safe height at a feed speed of 30r/min F2000, so that the high-precision intermittent long blind shaft hole machining is completed.
The calculation method of the cutter rotating speed comprises the following steps: n=vc×318/D, where Vc is linear velocity and D is tool diameter; the method for calculating the feed speed Vf comprises the following steps: vf=fz×n, where fz is the feed per tooth, Z is the number of tool edges, and N is the tool rotation speed.
The invention firstly adopts the conventional cutter and the conventional method to process the front end hole of the long shaft hole to meet the requirements, then guides the cutter to process the rear end hole of the long shaft hole by the processed hole at the front end and the guide hole of the guide wall, and the cutter can inhibit the traction assurance position and coaxiality of the inclined surface of the blank of the long shaft hole at the rear end due to the guide of the guide wall, so that the cutter is stable during the guide to avoid vibration assurance of the diameter and roughness.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The high-precision intermittent slender blind shaft hole machining method is realized by a high-precision intermittent slender blind shaft hole machining device, and the high-precision intermittent slender blind shaft hole machining device comprises a guide clamp and a guide cutter (2); the guide clamp is arranged on the workbench; the guiding cutter is arranged on the cutter library; the guide clamp comprises a guide wall (1) and a clamp bottom plate (3); the guide wall (1) is positioned on the clamp bottom plate (3) through a guide wall positioning pin (12), and is fixed on the clamp bottom plate (3) through a mounting screw (13); the guiding cutter (2) comprises a guiding lengthened drill bit (21), a guiding lengthened reamer (22) and a guiding lengthened reamer (23); the upper end of the guide wall (1) is provided with a guide hole (11), a positioning hole for installing a guide wall positioning pin (12) and a mounting hole for installing a screw (13); the method is characterized by comprising the following steps of:
firstly, installing a guide wall (1) on a workbench, and inputting a zero point of a part machining coordinate system into numerical control equipment after alignment;
step two, after clamping the guiding lengthened drill bit (21), the guiding lengthened reamer (22) and the guiding lengthened reamer (23) into the cutter handle, measuring the lengths respectively, installing the lengths into a cutter library, and inputting cutter length compensation into numerical control equipment;
step three, machining the diameter of the front section (41) of the intermittent slender blind shaft hole;
step four, guiding the lengthened drill bit (21) to enter a guiding hole (11) through a front section (41) of a discontinuous slender blind shaft hole at a feeding speed of 30r/min rotating speed F1000, calculating a cutter rotating speed N at a linear speed of Vc=60 m/min before a blank at a rear section (42) of the discontinuous slender blind shaft hole, calculating a feeding speed Vf at a feeding amount per revolution of fr=0.1 mm/r, processing the cutter to the bottom of the hole at the feeding speed Vf of 30r/min rotating speed F2000, and retracting the cutter to a safe height;
step five, guiding the lengthened reamer (22) to enter a guiding hole (11) through a front section (41) of a discontinuous slender blind shaft hole at a feeding speed of 30r/min F1000, calculating a cutter rotating speed N at a linear speed of Vc=30m/min before a blank at a rear section (42) of the discontinuous slender blind shaft hole, calculating a feeding speed vf=fz=zz×N at a feeding amount per tooth of fz=0.05mm/Z, machining the cutter to the bottom of the hole at a feeding speed Vf of 30r/min F2000, and retracting the cutter to a safe height;
step six, guiding the lengthened reamer (23) to enter the guiding hole (11) through the front section (41) of the intermittent slender blind shaft hole at the feeding speed of the rotating speed F1000 of 30r/min until the cutter guiding part (25) reaches the blank of the rear section (42) of the intermittent slender blind shaft hole, calculating the cutter rotating speed N=Vc by 318/D at the linear speed of Vc=20m/min, calculating the feeding speed vf=fz by Z by N at the feeding quantity of each tooth of fz=0.02 mm/Z, processing the cutter to the bottom of the hole at the feeding speed Vf of the cutter rotating speed N, and retracting the cutter to the safe height at the feeding speed of the rotating speed F2000 of 30r/min, thereby finishing the processing of the intermittent slender blind shaft hole with high precision.
2. A method of machining a high precision intermittent elongated blind shaft bore according to claim 1, characterized in that one end of the pilot bore (11) is provided with a pilot chamfer.
3. The high-precision intermittent elongated blind shaft hole machining method according to claim 1, wherein the pilot elongated drill (21), pilot elongated reamer (22) and pilot elongated reamer (23) comprise a cutting portion (24), a guiding portion (25) and a clamping portion (26); the diameters of the guide lengthened drill bit (21), the guide lengthened reamer (22) and the guide part (25) of the guide lengthened reamer (23) are the same.
4. A method of machining a high precision intermittent elongated blind shaft bore according to claim 3, characterized in that the final bore allowance of the diameter of the cutting portion (24) of the pilot-elongated drill (21) is 1-2mm; the final aperture margin of the diameter of the cutting part (24) of the guiding lengthened reamer (22) is 0.2mm-0.4mm; the diameter of the cutting part (24) of the guide lengthened reamer (23) is the final aperture; the diameter of the clamping part (26) is the clamping diameter of a standard tool shank, and the diameter of the guiding part (25) is 0.005-0.01mm smaller than the diameter of the cutting part (24) of the guiding lengthened reamer (23).
5. A method of machining a high precision intermittent elongated blind shaft bore according to claim 1, wherein the diameter of the machining intermittent elongated blind shaft bore front section (41) is 0.005-0.01mm larger than the diameter of the cutting portion (24) of the pilot-elongated reamer (23).
6. The method for machining the high-precision intermittent slender blind shaft hole according to claim 1, wherein the method for calculating the rotating speed of the cutter in the fourth step is as follows: n=vc×318/D, where Vc is linear velocity and D is tool diameter; the method for calculating the feed speed Vf comprises the following steps: vf=fr×n, where fr is the feed amount per revolution and N is the tool rotation speed.
7. The method for machining the high-precision intermittent slender blind shaft hole according to claim 1, wherein the method for calculating the rotating speed of the cutter in the fifth step is as follows: n=vc×318/D, where Vc is linear velocity and D is tool diameter; the method for calculating the feed speed Vf comprises the following steps: vf=fz×n, where fz is the feed per tooth, Z is the number of tool edges, and N is the tool rotation speed.
8. The method for machining the high-precision intermittent slender blind shaft hole according to claim 1, wherein the method for calculating the rotating speed of the cutter in the step six is as follows: n=vc×318/D, where Vc is linear velocity and D is tool diameter; the method for calculating the feed speed Vf comprises the following steps: vf=fz×n, where fz is the feed per tooth, Z is the number of tool edges, and N is the tool rotation speed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210124052.4A CN114905280B (en) | 2022-02-10 | 2022-02-10 | High-precision intermittent slender blind shaft hole machining device and machining method |
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| CN202210124052.4A CN114905280B (en) | 2022-02-10 | 2022-02-10 | High-precision intermittent slender blind shaft hole machining device and machining method |
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| CN114905280B true CN114905280B (en) | 2023-06-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1079308C (en) * | 1999-03-24 | 2002-02-20 | 叶小宁 | Processing method of superlong precision deep bore and its equipment |
| CN108176896B (en) * | 2018-02-01 | 2023-10-17 | 苏州阿诺精密切削技术有限公司 | Burnishing reamer for high-precision deep hole machining |
| CN112008101A (en) * | 2020-07-16 | 2020-12-01 | 上海航天精密机械研究所 | Drilling method for ultra-deep long hole |
| CN213729547U (en) * | 2020-10-21 | 2021-07-20 | 常州法蒙精密机械有限公司 | Deep hole processing drilling reamer |
| CN113333805A (en) * | 2021-06-24 | 2021-09-03 | 中国航发中传机械有限公司 | Variable-section multi-layer intermittent deep hole machining method |
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