CN112756667B - Deep hole machining device capable of being applied to machining center metal piece - Google Patents
Deep hole machining device capable of being applied to machining center metal piece Download PDFInfo
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- CN112756667B CN112756667B CN202011576922.9A CN202011576922A CN112756667B CN 112756667 B CN112756667 B CN 112756667B CN 202011576922 A CN202011576922 A CN 202011576922A CN 112756667 B CN112756667 B CN 112756667B
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- cutter head
- guide cylinder
- roller
- deep hole
- drill rod
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/02—Connections between shanks and removable cutting heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/70—Drills with vibration suppressing means
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- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
Abstract
The invention provides a deep hole processing device applicable to processing a central metal piece, which comprises a drill rod, wherein a guide cylinder is sleeved on the outer side of the drill rod, a group of guide cylinder rolling shafts are arranged in the guide cylinder, the guide cylinder is movably contacted with the drill rod through the guide cylinder rolling shafts, the bottom of the drill rod is connected with a cutter head through threads, the cutter head comprises a cutter handle, a cutter head rolling shaft, a separating ring, a fixing ring and a cutting blade, the cutting blade is fixed on the lower end surface of the cutter handle through a screw assembly, a group of cutter head rolling shafts are sleeved on the side surface of the cutter handle, the cutter head rolling shafts are separated through the separating ring, and the bottom of the cutter head is limited and fixed through the fixing ring. Avoid the deviation of tool bit deformation and tool bit advancing direction, have good development prospect.
Description
Technical Field
The invention relates to the technical field of metal piece machining, in particular to a deep hole machining device applicable to a machining center metal piece.
Background
In the mechanical processing process, a numerical control boring machine or a processing center is generally used for processing holes and hole systems, a drill rod is driven by the rotation of a main shaft to implement processing, the drawing requirements are met, the deep hole processing refers to the processing of holes with the diameter ratio of the length of the hole to the diameter of the hole being more than 5, and the processing difficulty is high due to the fact that inner holes of workpieces are too large and too deep;
the main problem is how to keep the machining precision of the product to meet the design requirement, so that the machining precision of the large-diameter ultra-deep hole needs to be controlled in real time to ensure the machining precision and the operation safety;
however, due to inherent limitations of a deep hole, such as a special closed narrow space and a weak stiffness system, bending deformation of a drilling rod system of a drilling part in a machining process can be caused, and consistency and precision requirements of aperture size, straightness accuracy and roundness are difficult to guarantee in large-scale machining production.
Disclosure of Invention
The invention aims to provide a deep hole processing device which can be applied to processing metal parts in a center and has high consistency and precision of aperture size, straightness and roundness.
In order to achieve the purpose, the invention provides the following technical scheme:
a deep hole processing device applicable to processing a central metal piece comprises a drill rod, wherein a guide cylinder is sleeved on the outer side of the drill rod, a group of guide cylinder rolling shafts are arranged in the guide cylinder, the guide cylinder is movably contacted with the drill rod through the guide cylinder rolling shafts, and the bottom of the drill rod is connected with a tool bit through threads;
the cutter head comprises a cutter handle, cutter head rolling shafts, separating rings, fixing rings and a cutting blade, the cutting blade is fixed on the lower end face of the cutter handle through a screw assembly, a group of cutter head rolling shafts are sleeved on the side surface of the cutter handle, the cutter head rolling shafts are separated through the separating rings, and the bottom of each cutter head rolling shaft is limited and fixed through the fixing rings.
As a further scheme of the invention: the cross section of the guide cylinder is T-shaped, the guide cylinder is embedded in the orifice of the deep hole of the workpiece, a circular through hole is formed in the middle of the guide cylinder, a guide cylinder rolling shaft is arranged on the inner wall of the through hole, and the drill rod penetrates through the guide cylinder through hole.
As a further scheme of the invention: the guide cylinder roller comprises a guide cylinder roller outer shaft, a guide cylinder roller inner shaft and a guide cylinder roller ball, the guide cylinder roller ball is embedded between the guide cylinder roller outer shaft and the guide cylinder roller inner shaft, a circular through hole with the diameter smaller than that of the guide cylinder roller ball is arranged on the guide cylinder roller inner shaft and at the position of the guide cylinder roller ball, and part of the guide cylinder roller ball structure extends out of the through hole.
As a further scheme of the invention: the knife handle is composed of a handle body and arc rods, the knife head rolling shaft, the separating ring, the fixing ring and the cutting blade are all arranged on the handle body, and the upper end of the handle body is provided with a plurality of arc rods.
As a further scheme of the invention: be the toper between the arc pole and distribute, keep 3 angle settings with vertical direction, the side surface top of arc pole is provided with helicitic texture, and it is fixed that the go-between through threaded connection is restrainted at the arc pole top, forms the thick shuttle type structure in the middle of the both ends are thin, and the outside of go-between is provided with helicitic texture.
As a further scheme of the invention: the drilling rod comprises a rod body, a cutting fluid guide groove and a cutter head connecting groove, the rod body is of a hollow structure, the cutting fluid guide groove is arranged on the inner side of the rod body, a corresponding guide groove structure is arranged in the cutter head, and the cutter head connecting groove is connected to the bottom of the cutting fluid guide groove.
As a further scheme of the invention: the tool bit spread groove includes helicitic texture and cambered surface structure two parts, and the helicitic texture corresponds with go-between outside screw thread, and the cambered surface structure internal diameter is greater than the arc pole part diameter of handle of a knife.
As a further scheme of the invention: the cutter head roller comprises a cutter head roller outer shaft, a cutter head roller inner shaft and cutter head roller balls, a plurality of ball seats are arranged in the cutter head roller inner shaft, the cutter head roller balls are embedded between the ball seats and the cutter head roller outer shaft, a circular through hole with the diameter smaller than that of the cutter head roller balls is arranged on the cutter head roller outer shaft and at the position of the cutter head roller balls, and part of the cutter head roller balls extend out of the through hole.
As a further scheme of the invention: the ball seat is composed of arc wing structures at two sides, the wing structures at two sides are distributed in a V shape and respectively support the rolling balls of the cutter head rolling shaft from two sides, and a movable gap is reserved between the wing structures and the inner shaft of the cutter head rolling shaft.
Advantageous effects
1. According to the invention, the guide cylinder is arranged at the orifice position of the deep hole, the group of guide cylinder rolling shafts are arranged in the guide cylinder, and the rolling shafts play a role in fixing the middle structure of the drill rod passing through the guide cylinder, so that the deviation of transmission precision caused by the fact that the drill rod structure is easy to deform under stress due to the fact that the length of the drill rod is too long is reduced, the processing precision of the deep hole is improved, and the consistency and precision of the aperture size, the straightness and the roundness of the deep hole of the workpiece are ensured.
2. The outer side of the tool bit is provided with the group of tool bit rolling shafts, the tool bit rolling shafts are attached to the inner wall of the deep hole, the tool bit is stabilized, the vibration of the tool bit is reduced, the cutting direction of the tool bit is guided, the machining precision of the deep hole is improved, and the consistency and precision of the aperture size, the straightness and the roundness of the deep hole of the workpiece are guaranteed.
3. The roller seat is arranged in the cutter head roller and used for fixing the roller of the cutter head roller, the fin structures on two sides of the roller seat are used for fixing the roller of the cutter head roller, when the roller of the cutter head roller is stressed, the fin structures on two sides can be pressed down, a certain moving range is provided for the roller of the cutter head roller, the roller of the cutter head roller can conveniently enter the deep hole structure, the roller of the cutter head roller is more attached to the inner wall of the deep hole, the roller of the cutter head roller is elastically attached, and the defect that the roller of the deep hole is easily scratched by the rigid contact roller of the cutter head roller is overcome.
4. According to the invention, the arc rod structure is arranged at the tail end of the cutter handle, the top of the arc rod is fixed in a bundling manner through the connecting ring in threaded connection, a shuttle-shaped structure with two thin ends and a thick middle part is formed, the shuttle-shaped structure can deform and expand when the device is started, the cutter head is driven to float and absorb the reaction force of a workpiece on the cutter head, the deviation of the cutter head in the advancing direction caused by the deformation of the cutter head structure is avoided, and the consistency and the precision of the aperture size, the straightness and the roundness of the deep hole of the workpiece are ensured.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Figure 2 is a cross-sectional view of a drill pipe construction of the present invention.
Fig. 3 is a schematic view of a tool tip of the present invention.
FIG. 4 is a cross-sectional view of a tool tip configuration of the present invention.
FIG. 5 is a cross-sectional view of a tool shank configuration of the present invention.
Fig. 6 is a sectional view of a guide roller structure according to the present invention.
Figure 7 is a cross-sectional view of a bit roller construction of the present invention.
In FIGS. 1-7: 1-drill rod, 101-rod body, 102-cutting fluid guide groove, 103-cutter head connecting groove, 2-guide cylinder, 3-guide cylinder roller, 301-guide cylinder roller outer shaft, 302-guide cylinder roller inner shaft, 303-guide cylinder roller ball, 4-cutter head, 5-cutter handle, 501-handle body, 502-arc rod, 6-connecting ring, 7-cutter head roller, 701-cutter head roller outer shaft, 702-cutter head roller inner shaft, 703-roller seat, 704-cutter head roller ball, 8-separating ring, 9-fixing ring, 10-cutting blade and 11-workpiece.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of the word "comprising" or "comprises", and the like, in this disclosure is intended to mean that the elements or items listed before that word, include the elements or items listed after that word, and their equivalents, without excluding other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
Referring to fig. 1 to 7, in an embodiment of the present invention, a deep hole processing apparatus applicable to a processing center metal piece includes a drill rod 1, a rod body 101, a cutting fluid guide groove 102, a tool bit connection groove 103, a guide cylinder 2, a guide cylinder roller 3, a guide cylinder roller outer shaft 301, a guide cylinder roller inner shaft 302, a guide cylinder roller ball 303, a tool bit 4, a tool shank 5, a shank body 501, an arc rod 502, a connection ring 6, a tool bit roller 7, a tool bit roller outer shaft 701, a tool bit roller inner shaft 702, a ball seat 703, a tool bit roller ball 704, a separation ring 8, a fixing ring 9, a cutting blade 10, and a workpiece 11, wherein the guide cylinder 2 is sleeved on an outer side of the drill rod 1, a group of guide cylinder rollers 3 is disposed in the guide cylinder 2, the guide cylinder 2 is in movable contact with the drill rod 1 through the guide cylinder roller 3, and the bottom of the drill rod 1 is connected with the tool bit 4 through a thread;
the cutter head 4 comprises a cutter handle 5, cutter head rolling shafts 7, a separating ring 8, a fixing ring 9 and a cutting blade 10, the cutting blade 10 is fixed on the lower end face of the cutter handle 5 through a screw assembly, a group of cutter head rolling shafts 7 are sleeved on the side surface of the cutter handle 5, the cutter head rolling shafts 7 are separated through the separating ring 8, and the bottom of each cutter head rolling shaft is limited and fixed through the fixing ring 9.
Wherein: the section of the guide cylinder 2 is T-shaped, the guide cylinder 2 is embedded in the orifice of the deep hole of the workpiece 11, a circular through hole is formed in the middle of the guide cylinder 2, a guide cylinder roller 3 is arranged on the inner wall of the through hole, and the drill rod 1 penetrates through the through hole of the guide cylinder 2.
Wherein: the guide cylinder roller 3 comprises a guide cylinder roller outer shaft 301, a guide cylinder roller inner shaft 302 and a guide cylinder roller ball 303, the guide cylinder roller ball 303 is embedded between the guide cylinder roller outer shaft 301 and the guide cylinder roller inner shaft 302, a circular through hole with the diameter smaller than that of the guide cylinder roller ball 303 is arranged on the guide cylinder roller inner shaft 302 and the guide cylinder roller ball 303, part of the structure of the guide cylinder roller ball 303 extends out of the through hole, the guide cylinder roller 3 plays a role in fixing the middle structure of the drill rod 1 penetrating through the guide cylinder 2, and the deviation of the machining precision caused by the stress deformation of the structure of the drill rod 1 due to the fact that the length of the drill rod 1 is too long is reduced.
Wherein: the knife handle 5 is composed of a handle body 501 and arc rods 502, the knife head rolling shaft 7, the separating ring 8, the fixing ring 9 and the cutting blade 10 are all arranged on the handle body 501, and the upper end of the handle body 501 is provided with a plurality of arc rods 502.
Wherein: be the toper between the arc pole 502 and distribute, keep 3 angle settings with vertical direction, the side surface top of arc pole 502 is provided with the helicitic texture, it is fixed that the go-between 6 bunches up of threaded connection is passed through at arc pole 502 top, form thick shuttle type structure in the middle of the both ends are thin, the outside of go-between 6 is provided with the helicitic texture, the shuttle type structure can produce deformation and expand when the device starts, it floats and absorbs the reaction force of work piece to tool bit 4 to drive tool bit 4, avoid tool bit 4 structural deformation and tool bit 4 advancing direction's deviation.
Wherein: the drill rod 1 comprises a rod body 101, a cutting fluid guide groove 102 and a cutter head connecting groove 103, wherein the rod body 101 is of a hollow structure, the cutting fluid guide groove 102 is arranged on the inner side of the rod body, a corresponding guide groove structure is arranged in the cutter head 4, and the cutter head connecting groove 103 is connected to the bottom of the cutting fluid guide groove 102.
Wherein: the tool bit connecting groove 103 comprises a thread structure and an arc-shaped structure, the thread structure corresponds to the outer thread of the connecting ring, the inner diameter of the arc-shaped structure is larger than the diameter of the arc rod 502 part of the tool holder 5, and a deformation space is reserved for the shuttle-shaped structure formed by the arc rod 502 through the arc-shaped structure of the tool bit connecting groove 103.
Wherein: the bit roller 7 comprises a bit roller outer shaft 701, a bit roller inner shaft 702 and a bit roller ball 704, wherein a plurality of ball seats 703 are arranged in the bit roller inner shaft 702, the bit roller ball 704 is embedded between the ball seats 703 and the bit roller outer shaft 701, a circular through hole with the diameter smaller than that of the bit roller ball 704 is arranged on the bit roller outer shaft 701 and at the position of the bit roller ball 704, and part of the bit roller ball 704 protrudes out of the through hole.
Wherein: the ball seat 703 is composed of two side arc wing structures, the two side wing structures are distributed in a V shape, and respectively support the cutter head roller ball 704 from two sides, a movable gap is left between the wing structures and the inner shaft 702 of the cutter head roller, when the cutter head roller ball 704 is stressed, the wing structures on two sides can be pressed down, a certain movable range is provided for the cutter head roller ball 704, the cutter head roller 7 is convenient to enter a deep hole structure, the cutter head roller ball 704 structure is more attached to the inner wall of the deep hole, and the deep hole roller ball 704 is elastically attached, and the deep hole inner wall structure is prevented from being scratched by the rigid contact cutter head roller ball 704 structure.
The fins are made of die steel sheets with strong toughness after heat treatment.
When the device is used, a shallow hole is formed in a workpiece 11 in advance, the device is connected to a machining center, a guide cylinder 2 is embedded at the orifice position of the shallow hole, a tool bit 4 and a drill rod 1 extend into the shallow hole of the workpiece 11, the drill rod 1 is driven to rotate by controlling the machining center, a shuttle-shaped structure formed by an arc rod 502 is deformed and expanded by the middle position of the reaction force of the workpiece 11 to the tool bit 4 when the device is started, the tool bit 4 is driven to float and absorb the reaction force of the workpiece 11 to the tool bit 4, the deviation of the structure deformation of the tool bit 4 and the advancing direction of the tool bit 4 is avoided, a guide cylinder roller 3 arranged in the guide cylinder 2 can play a role in fixing the middle structure of the drill rod 1 penetrating through the guide cylinder 4, the deviation of the transmission precision caused by the easy stress deformation of the structure of the drill rod 1 due to the overlong length of the drill rod 1 is reduced, and simultaneously, a tool bit roller ball 704 of a tool bit roller 7 at the position of the tool bit 4 is elastically attached to the inner wall of a deep hole, the tool bit 4 is stabilized, the vibration of the tool bit 4 is reduced, and the cutting direction of the tool bit 4 is guided, so that the processing precision of the deep hole is improved, and the consistency and precision of the aperture size, the straightness and the roundness of the deep hole of the workpiece 11 are ensured.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make several variations and modifications without departing from the concept of the present invention, and these should be considered as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (7)
1. A deep hole machining device applicable to a machining center metal piece is characterized by comprising a drill rod (1), wherein a guide cylinder (2) is sleeved on the outer side of the drill rod (1), a group of guide cylinder rolling shafts (3) are arranged in the guide cylinder (2), the guide cylinder (2) is movably contacted with the drill rod (1) through the guide cylinder rolling shafts (3), and the bottom of the drill rod (1) is connected with a tool bit (4) through threads;
the cutter head (4) comprises a cutter handle (5), cutter head rollers (7), a separating ring (8), a fixing ring (9) and a cutting blade (10), the cutting blade (10) is fixed on the lower end face of the cutter handle (5) through a screw assembly, a group of cutter head rollers (7) are sleeved on the side surface of the cutter handle (5), the cutter head rollers (7) are arranged in a separating mode through the separating ring (8), and the bottom of the cutter head rollers is fixed in a limiting mode through the fixing ring (9);
the knife handle (5) consists of a handle body (501) and arc rods (502), the knife head rolling shaft (7), the separating ring (8), the fixing ring (9) and the cutting blade (10) are all arranged on the handle body (501), and the upper end of the handle body (501) is provided with a plurality of arc rods (502);
be the toper between arc pole (502) and distribute, keep 3 angle settings with vertical direction, the side surface top of arc pole (502) is provided with helicitic texture, and arc pole (502) top is fixed through the go-between (6) of threaded connection is restrainted, forms the thick shuttle type structure in the middle of the both ends are thin, and the outside of go-between (6) is provided with helicitic texture.
2. A deep hole processing apparatus applicable to a processing center metal member according to claim 1, wherein: the section of the guide cylinder (2) is T-shaped, the guide cylinder is embedded in the orifice of the deep hole of the workpiece (11), a circular through hole is formed in the middle of the guide cylinder (2), a guide cylinder roller (3) is arranged on the inner wall of the through hole, and the drill rod (1) penetrates through the through hole of the guide cylinder (2).
3. A deep hole processing apparatus applicable to a processing center metal member according to claim 1, wherein: the guide cylinder roller (3) comprises a guide cylinder roller outer shaft (301), a guide cylinder roller inner shaft (302) and guide cylinder roller balls (303), the guide cylinder roller balls (303) are embedded between the guide cylinder roller outer shaft (301) and the guide cylinder roller inner shaft (302), a circular through hole with the diameter smaller than that of the guide cylinder roller balls (303) is formed in the position of the guide cylinder roller inner shaft (302) and the guide cylinder roller balls (303), and part of the structure of the guide cylinder roller balls (303) extends out of the through hole.
4. A deep hole processing apparatus applicable to a processing center metal member according to claim 1, wherein: the drill rod (1) comprises a rod body (101), a cutting fluid guide groove (102) and a cutter head connecting groove (103), wherein the rod body (101) is of a hollow structure, the cutting fluid guide groove (102) is arranged on the inner side of the rod body, a corresponding guide groove structure is arranged in the cutter head (4), and the cutter head connecting groove (103) is connected to the bottom of the cutting fluid guide groove (102).
5. A deep hole machining device applicable to a machining center metal piece according to claim 4, wherein: the tool bit connecting groove (103) comprises a thread structure and an arc-shaped surface structure, the thread structure corresponds to the thread on the outer side of the connecting ring, and the inner diameter of the arc-shaped surface structure is larger than the diameter of the arc rod (502) of the tool handle (5).
6. A deep hole processing apparatus applicable to a processing center metal member according to claim 1, wherein: the cutter head roller (7) comprises a cutter head roller outer shaft (701), a cutter head roller inner shaft (702) and cutter head roller balls (704), a plurality of ball seats (703) are arranged in the cutter head roller inner shaft (702), the cutter head roller balls (704) are embedded between the ball seats (703) and the cutter head roller outer shaft (701), a circular through hole with the diameter smaller than that of the cutter head roller balls (704) is formed in the position, located on the cutter head roller outer shaft (701), of the cutter head roller balls (704), and part of the structure of the cutter head roller balls (704) extends out of the through hole.
7. A deep hole machining apparatus applicable to a machining center metal member according to claim 6, wherein: the ball seat (703) is composed of arc-shaped wing structures at two sides, the wing structures at two sides are distributed in a V shape and respectively support the cutter head roller balls (704) from two sides, and a movable gap is reserved between the wing structures and the inner shaft (702) of the cutter head roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011576922.9A CN112756667B (en) | 2020-12-28 | 2020-12-28 | Deep hole machining device capable of being applied to machining center metal piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011576922.9A CN112756667B (en) | 2020-12-28 | 2020-12-28 | Deep hole machining device capable of being applied to machining center metal piece |
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| Publication Number | Publication Date |
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| CN112756667A CN112756667A (en) | 2021-05-07 |
| CN112756667B true CN112756667B (en) | 2022-04-05 |
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| CN202011576922.9A Active CN112756667B (en) | 2020-12-28 | 2020-12-28 | Deep hole machining device capable of being applied to machining center metal piece |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113441759B (en) * | 2021-07-20 | 2022-04-29 | 陕西理工大学 | Hydraulic adjusting type deep hole boring cutter and adjusting method thereof |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1047617A1 (en) * | 1980-12-05 | 1983-10-15 | Предприятие П/Я Р-6760 | Guiding device for tool for working deep bores |
| SU975239A1 (en) * | 1981-05-06 | 1982-11-23 | за вители .,. --}-...,{ .,. I - --/::/ Я / I ПД Jri-ft-.. I В. П. Астахов / -tj --f u/- х/гЯ Т---,, --5 I --. - i | Tool for working deep holes |
| SU1502227A1 (en) * | 1987-07-06 | 1989-08-23 | Ленинградский механический институт им.Маршала Советского Союза Устинова Д.Ф. | Guiding device for the toll to machine deep holes |
| JP4733435B2 (en) * | 2005-06-06 | 2011-07-27 | ユニタック株式会社 | Deep hole drill head |
| CN205057122U (en) * | 2015-09-01 | 2016-03-02 | 天津金盛自动化科技有限公司 | Automatic BTA reaming rig |
| CN208083514U (en) * | 2018-03-21 | 2018-11-13 | 保定兴安风电设备有限公司 | High-effective deep hole drilling equipment |
| CN211540117U (en) * | 2019-09-24 | 2020-09-22 | 高束能(山东)纳米科技有限公司 | Rolling cutter and machine tool |
| CN110814393B (en) * | 2019-11-22 | 2020-10-23 | 中北大学 | Floating type multifunctional BTA deep hole cutter system based on self-guiding |
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2020
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