CN107937688A - A kind of high intensity punch and tooth root strengthening and processing device - Google Patents
A kind of high intensity punch and tooth root strengthening and processing device Download PDFInfo
- Publication number
- CN107937688A CN107937688A CN201610891653.2A CN201610891653A CN107937688A CN 107937688 A CN107937688 A CN 107937688A CN 201610891653 A CN201610891653 A CN 201610891653A CN 107937688 A CN107937688 A CN 107937688A
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- punch
- gear
- tooth root
- added
- coil
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2221/00—Treating localised areas of an article
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Gears, Cams (AREA)
Abstract
The invention discloses a kind of high intensity punch, surface for the tooth root for impacting gear, the punch (3) includes copper driving piece, intermetallic metal part and punch body, the intermetallic metal part connects the copper driving piece and the punch body, the copper driving piece is made close to the coil (22) for being used to produce the pulsed magnetic field, the punch body of martensitic precipitation.The invention also discloses a kind of tooth root strengthening and processing device.
Description
Technical field
At gear intensive treatment technical field, more particularly to a kind of high intensity punch and a kind of tooth root reinforcing
Manage device.
Background technology
Extend the flexible life of gear to improve the bending fatigue strength of gear, at present, generally use surface
The mode of processing introduces residual compressive stress layer to the tooth root of gear.The residual compressive stress layer for putting on root surface is believed to
Caused tension produces interaction during with working gear, so as to reduce the stress amplitude of root surface, will cause maximum etc.
The position of efficacy is moved to the inside of gear, and the crackle that can finally suppress root surface is produced and extended.
At present, a variety of gear surface reinforcement techniques can realize the introducing of residual compressive stress layer, be carried out according to strengthening mechanism
Classification can be divided into phase transformation strengthening, chemical enhanced and mechanical enhancer.Wherein, phase transformation strengthening with it is chemical enhanced all refer to it is complex
Heat treatment process, heat treatment can bring larger deformation and poor surface accuracy, and phase transformation strengthening with it is chemical enhanced
Processing procedure is complex and effect is limited.
Mechanical enhancer is mainly shot peening strengthening, and shot peening strengthening is the most widely used gear surface reinforcement technique.Shot-peening
Strengthen and impact root surface using High-velocity Projectiles, trigger the plastic deformation of root surface by the impact force of bullet, and then
Introduce residual stress layer.On the basis of shot-peening, the surface shot blasting strengthening skill such as ultrasonic shot peening, laser peening has been developed
Art.Ultrasonic shot peening is to provide mechanical energy by ultrasonic vibration installation for bullet, and a small amount of bullet hits, returns repeatedly in a device
Bullet, by the energy transmission of ultrasonic vibration to root surface, forms plastic deformation and residual stress layer.Laser peening is then in gear
Surface is coated with specific coatings, by the mode partial coating vaporized expanding of induced with laser, produces huge impact force to rush
Root surface is hit, is eventually introduced residual stress layer.
Stress peening process is to carry out shock peening to gear whole tooth (including end face, the flank of tooth, tooth root), due to tooth root
Complex geometry, narrow space, but ultrasonic shot peening is more difficult to implement intensive treatment, therefore, ultrasonic shot peening in above-mentioned environment
Inapplicable and tooth root environment, the specific aim strengthened for tooth root is not strong, and efficiency is relatively low.The unit interval of laser peening can be handled
Work surface limited area, corresponding cost is higher, it is difficult to is applied in industrial production.It is it will be apparent that strong using shot-peening
Change technology to tooth root implement reinforcing there are effect it is poor and less efficient the problem of.
With technological progress, discovery has that a kind of efficiency is higher, effect is relatively stable, cost is more cheap, operation is relatively simple
Single tooth root intensifying device, the surface peening mode of tooth root can be impacted using big quality punch, while make using electromagnetic field
For the driving source of compound punch, punch receives the electromagnetic force produced in pulsed magnetic field, and then can be past under the action of electromagnetic force
Multiple mobile, the reciprocating movement of punch can impact the tooth root of work gear to be added, to trigger the plastic deformation of root surface, and then introduce
Residual stress layer.
But this scheme is during realization, punch is during impact tooth root is strengthened, intensity to punch and tired
Labor performance requirement is higher, how to ensure the intensity and fatigue behaviour of punch, becomes those skilled in the art's technology urgently to be resolved hurrily
Problem.
The content of the invention
First purpose of the present invention is to provide a kind of high intensity punch, to solve how to ensure the intensity and fatigue of punch
The problem of performance.
Second object of the present invention is to provide a kind of tooth root strengthening and processing device with above-mentioned high intensity punch.
In order to realize above-mentioned first purpose, the present invention provides following technical solution：
A kind of high intensity punch, the surface of the tooth root for impacting gear, the punch include copper driving piece, intermetallic metal
Part and punch body, the intermetallic metal part connect the copper driving piece and the punch body, and the copper driving piece is close to use
In the coil for producing the pulsed magnetic field.
Preferably, the copper driving piece, the intermetallic metal part are bolted with the punch body.
High intensity punch provided by the invention is made of martensitic precipitation, since punch body is punch
Main part, and punch hits the part of tooth root, therefore punch body needs have larger intensity, higher fatigability
It can require, and martensitic precipitation has higher intensity (its yield strength is up to more than 2.5Gpa), has excellent
Good thermal fatigue resistance and corrosion resistance, for this reason, present invention can assure that the intensity and fatigue behaviour of punch.
In order to realize above-mentioned second purpose, the present invention provides following technical solution：
A kind of tooth root strengthening and processing device, including charge-discharge control system, punch driver, punch, positioner and
Striking gear；Wherein：
The punch driver includes base and coil；The coil is arranged on the base, and with the charge and discharge
Electric control system is connected, for producing pulsed magnetic field；
The punch is arranged on the base, and can be moved back and forth relative to the base；The punch with it is to be processed
The teeth groove of gear is opposite, and the tooth root of the work gear to be added can be impacted under the action of the pulsed magnetic field；The punch bag
Copper driving piece, intermetallic metal part and punch body are included, the intermetallic metal part connects the copper driving piece and the punch body,
The copper driving piece is close to the coil for being used to produce the pulsed magnetic field, and the punch body is using martensitic precipitation hardening stainless
Steel is made.
The positioner is used to be threaded through in the axis hole of the work gear to be added, is used to support the work gear to be added；
The striking gear is used to engage with the work gear to be added, described to be added for being stirred when the punch is in avoidance state
Work gear is rotated around the positioner.
Preferably, the striking gear is rack drives mechanism or gear driven mechanism, the tooth of the rack drives mechanism
Bar or the gear of the gear driven mechanism are engaged with the work gear to be added.
Preferably, the rack drives mechanism includes rack and track, and the rack is slidably matched with the track, described
Rack can be moved along the track；The track is cross track.
Preferably, the electric wire of the coil is formed by copper wire and carbon nanotubes coiling.
Preferably, the base includes first and second, and described second is articulated with described first, and with it is described
Coil is connected with the punch；Described second can drive circuit oscillation of the punch along the work gear to be added.
Preferably, the limiting device being arranged on described second is further included, the limiting device is used for and the punch
In the spacing cooperation of the afterbody of the punch.
Preferably, elastic component is further included；The elastic component is arranged between the limiting device and the punch.
Preferably, base driving device is further included, the base driving device is used to drive the base to drive the punching
Head switches between its avoidance state and working status.
Tooth root strengthening and processing device provided by the invention during work, charge-discharge control system to coil charges,
So that the powered generation pulsed magnetic field of coil, punch are subject to electromagnetic force under the action of pulsed magnetic field, and then can be past relative to base
Multiple mobile, the reciprocating movement of punch can produce the tooth root for impacting work gear to be added.Punch is deposited in the operating condition can bump
Work gear to be added so to tooth root introduce residual stress layer, play strengthen tooth root purpose.When punch corresponds under a certain state
Teeth groove in tooth root be reinforced after completion, punch retraction and enter avoidance state, at this time punch exited from teeth groove, stir
Device work can cause work gear to be added to rotate, so that next teeth groove is corresponding with punch, punch enters next punching
Enhance process is hit, until the tooth root of work gear to be added is strengthened completing.
Tooth root strengthening and processing device provided by the invention can be seen that by the above-mentioned course of work, in punch driver
Under the action of can bump work gear to be added tooth root, efficiency is higher, while effect is relatively stable.
Brief description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, drawings in the following description are only one described in the present invention
A little embodiments, for those of ordinary skill in the art, can also obtain other attached drawings according to these attached drawings.
Fig. 1 is the structure diagram of tooth root strengthening and processing device provided in an embodiment of the present invention, and Fig. 1 is top view；
Fig. 2 is the structure diagram of coil provided in an embodiment of the present invention；
Fig. 3 is the arrangement schematic diagram of spring on base provided in an embodiment of the present invention.
Embodiment
In order to make those skilled in the art more fully understand technical scheme, below in conjunction with attached drawing to this hair
It is bright to be further detailed.
Please refer to Fig.1, a kind of high intensity punch 3 provided by the invention, the surface of the tooth root for impacting gear, the punching
First 3 are arranged on base 21, and can be moved back and forth relative to the base 21；The teeth groove phase of the punch 3 and work gear 5 to be added
It is right, and the tooth root of the work gear to be added 5 can be impacted under the action of pulsed magnetic field；The punch 3 includes copper driving piece, centre
Metalwork and punch body, the intermetallic metal part connect the copper driving piece and the punch body, and the copper driving piece leans on
The nearly coil 22 for being used to produce the pulsed magnetic field.
It can be bolted between above-mentioned three.Since punch body is the main part of punch 3, and punch 3
The part of tooth root is hit, therefore punch body needs have larger intensity, the requirement of higher fatigue behaviour, and martensitic precipitation
Hardening stainless steel has higher intensity (its yield strength is up to more than 2.5Gpa), has excellent thermal fatigue resistance and resistance to
Corrosive nature.For this reason, punch body can be made of martensitic precipitation.
- Fig. 3 is please referred to Fig.1, the embodiment of the present invention provides a kind of device for being used to implement the tooth root of gear reinforcing.Carried
The device of confession includes charge-discharge control system 1, punch driver 2, punch 3, positioner 4 and stirs device.
The effect of punch driver 2 is that driving punch 3 moves, and punch driver 2 includes base 21 and coil 22, line
Circle 22 is arranged on base 21.As shown in Fig. 2, coil 22 is usually spiral coil.In the application, coil 22 is in charged state
Lower generation pulsed magnetic field, charge-discharge control system 1 are connected with coil 22, for realizing charge and discharge by circuit control, protect
It is about 10T that size is constantly produced in card coil 22, the pulsed magnetic field that pulse length is about 20ms.
Punch 3 is usually made of the material of high intensity, and punch 3 is arranged on base 21, and can be past relative to base 21
It is multiple mobile, i.e., prismatic pair is formed between the two.Punch 3 is opposite with the teeth groove of work gear 5 to be added, and can be in the work of pulsed magnetic field
With the tooth root of lower impact gear 5 to be processed.
Positioner is used to be threaded through in the axis hole of work gear 5 to be added, is used to support work gear 5 to be added.Striking gear is used
In stirring work gear 5 to be added, work gear 5 to be added can be stirred when punch 3 is in avoidance state and is rotated around positioner.The application
In, positioner is usually locating shaft, and striking gear can be rack drives mechanism 6 or gear driven mechanism, rack drives machine
The gear of the rack and pinion driving mechanism of structure 6 is engaged with work gear 5 to be added, passes through the movement of rack or gear driven mechanism
Gear is rotated to drive work gear 5 to be added to rotate, and opposite shape is in from the different teeth groove of work gear 5 to be added so as to fulfill punch 3
State, and then prepare for the subsequent impacts of punch 3.
During work, charge-discharge control system 1 charges device provided in an embodiment of the present invention to coil 22 so that
The powered generation pulsed magnetic field of coil 22, punch 3 are subject to electromagnetic force under the action of pulsed magnetic field and can be reciprocal relative to base 21
Mobile, the reciprocating movement of punch 3 can impact the tooth root of work gear 5 to be added.In the application, there are avoidance state and work for punch 3
State, bump work gear 5 to be added and then can introduce residual stress layer to tooth root under working status, play the mesh for strengthening tooth root
's.After tooth root of the punch 3 under a certain state in corresponding teeth groove is reinforced completion, punch 3 bounces back and enters and avoid shape
State, at this time punch 3 exited from teeth groove, striking gear can cause work gear 5 to be added to rotate so that next teeth groove with punching
First 3 is corresponding, and punch 3 enters next impact enhance process, until the tooth root of work gear 5 to be added is strengthened completing, is strengthening
During work, if necessary, work gear 5 to be added can be loaded positioner by operator from another side, so as to close
The tooth root in the face is implemented to strengthen.
It can be seen that what the root implementation provided in an embodiment of the present invention being used for gear was strengthened by the above-mentioned course of work
Device, the tooth root of energy bump work gear 5 to be added under the action of punch driver 2, efficiency is higher, while effect is more
Stablize.Device in the application will not be limited by tooth root complex geometry, narrow space, it is seen then that the embodiment of the present invention carries
The device of confession can solve to use blasting technology poor to less efficient and effect existing for tooth root implementation intensive treatment at present
Problem.
Referring again to Fig. 1, a kind of specific rack drives mechanism 6, including rack 61 and track 62, rack 61 and track
62 are slidably matched, and rack 61 can be moved along track 62, so as to fulfill the adjusting of 61 position of rack, finally so that rack 61 be in
The purpose that work gear 5 to be added engages, the collective effect of rack 61 and positioner so that work gear 5 to be added is in fixed position
Put, finally implement impact for follow-up punch 3 and get ready.Specifically, track 62 can be cross track, easily facilitate pair
The adjusting of 61 position of rack.
Coil 22 produces pulsed magnetic field in charge-discharge control system 1, and coil 22 can use different conductive metal materials
Coiling forms.Preferably, coil 22 is formed using copper wire and carbon nanotubes bifilar-wound.Forming the process of pulsed magnetic field
In, larger electric current can be produced among coil 22, the quantity of heat production of coil 22 is larger, and the repulsive force between coil 22 is larger.Carbon is received
Mitron has good electric conductivity and intensity, and quantity of heat production is smaller, therefore can reduce the quantity of heat production of coil 22, while intensity
Repulsive force that is higher, can preferably producing between absorbing coil 22.But since the material of carbon nanotubes prepares difficulty, because
This price costly, for this reason, above-mentioned coil 22 uses copper wire and carbon nanotubes bifilar-wound, can not only improve whole coil
22 heat dissipation performance and integral strength, while will not also make it that the manufacturing cost of whole coil 22 is too high, it is seen then that above-mentioned coil 22
Good cost performance.
In the application, punch 3 is usually compound punch, and punch 3 can produce vortex, vortex when coil 22 is loaded and changed
So that punch 3 is subject to great electromagnetic force in pulsed magnetic field, electromagnetic force can drive punch 3 to move, and reach impact tooth to be processed
The mesh of the tooth root of wheel 5, finally realizes that intensive treatment works.
In the embodiment of the present invention, base 21 can include first 211 and second 212, and second 212 is articulated with first
Portion 211, and be connected with coil 22 and the punch 3, second 212 can drive circumferential direction of the punch 3 along the work gear 5 to be added
Swing, so that punch 3 can impact in a region of tooth root, implement impact as much as possible in larger region and strengthen
Processing.
Preferably, limiting device 23 is provided with second 212, limiting device 23 is used for the afterbody in punch 3 with punch 3
Spacing cooperation, can absorb movement when punch 3 is in backhaul, meanwhile, coil 22 can be arranged on limiting device 23.More
Preferably, device provided in an embodiment of the present invention can also include elastic component, elastic component be arranged on limiting device 23 and punch 3 it
Between, cushioning effect can be preferably played, avoids punch 3 from being in the greater impact produced under backhaul state to limiting device 23.
Elastic component can be spring 24 or caoutchouc elasticity block.
Device provided in an embodiment of the present invention can also include base driving device 7, and base driving device 7 is used to drive bottom
Seat 21 drives punch 3 to switch between its avoidance state and working status.Base driving device 7 can be screw drive mechanism.
Base driving device 7 usually adjusts punch 3 in avoidance state and working status indirectly by adjusting the position of whole base 21
Between switch.
Some one exemplary embodiments that only the invention has been described by way of explanation above, undoubtedly, for ability
The those of ordinary skill in domain, without departing from the spirit and scope of the present invention, can be with a variety of modes to institute
The embodiment of description is modified.Therefore, above-mentioned attached drawing and description are regarded as illustrative in nature, and should not be construed as to the present invention
The limitation of claims.
Claims (9)
1. a kind of high intensity punch, the surface of the tooth root for impacting gear, it is characterised in that the punch (3) is driven including copper
Movable plate, intermetallic metal part and punch body, the intermetallic metal part connect the copper driving piece and the punch body, the copper
Driving piece uses martensitic precipitation close to the coil (22) for being used to produce the pulsed magnetic field, the punch body
It is made.
2. punch according to claim 1, it is characterised in that copper driving piece, the intermetallic metal part and the punching
Head body is bolted.
A kind of 3. tooth root strengthening and processing device, it is characterised in that including charge-discharge control system (1), punch driver (2),
Punch (3), positioner (4) and striking gear；Wherein：
The punch driver (2) includes base (21) and coil (22)；The coil (22) is arranged on the base (21)
On, and be connected with the charge-discharge control system (1), for producing pulsed magnetic field；
The punch (3) is arranged on the base (21), and can be moved back and forth relative to the base (21)；The punch
(3) it is opposite with the teeth groove of work gear to be added (5), and the work gear to be added (5) can be impacted under the action of the pulsed magnetic field
Tooth root；The punch (3) includes copper driving piece, intermetallic metal part and punch body, the intermetallic metal part and connects the copper
Piece and the punch body are driven, the copper driving piece is close to the coil (22) for being used to produce the pulsed magnetic field, the punch
Body is made of martensitic precipitation；
The positioner is used to be threaded through in the axis hole of the work gear to be added (5), is used to support the work gear to be added
(5)；The striking gear is used to engage with the work gear (5) to be added, for being dialled when the punch (3) is in avoidance state
The work gear (5) to be added is moved to rotate around the positioner.
4. tooth root strengthening and processing device as claimed in claim 3, it is characterised in that the striking gear is rack drives mechanism
(6) or gear driven mechanism, the rack of the rack drives mechanism (6) or the gear of the gear driven mechanism with it is described to be added
Work gear (5) engages.
5. tooth root strengthening and processing device as claimed in claim 4, it is characterised in that the rack drives mechanism (6) includes tooth
Bar (61) and track (62), the rack (61) are slidably matched with the track (62), and the rack (61) can be along the track
(62) it is mobile；The track (62) is cross track.
6. tooth root strengthening and processing device as claimed in claim 3, it is characterised in that the base (21) includes first
(211) be articulated with first (211) with second (212), second (212), and with the coil (22) and institute
Punch (3) is stated to be connected；Second (212) can drive the punch (3) to be put along the circumferential direction of the work gear (5) to be added
It is dynamic.
7. tooth root strengthening and processing device as claimed in claim 6, it is characterised in that further include and be arranged at described second
(212) limiting device (23) on, the limiting device (23) are used to limit with afterbody of the punch (3) in the punch (3)
Position coordinates.
8. tooth root strengthening and processing device as claimed in claim 7, it is characterised in that further include elastic component；The elastic component is set
Put between the limiting device (23) and the punch (3).
9. the tooth root strengthening and processing device as described in any in claim 3-8, it is characterised in that further include base driving device
(7), the base driving device (7) is used to drive the base (21) to drive the punch (3) to avoid state and work at it
Switch between state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610891653.2A CN107937688B (en) | 2016-10-12 | 2016-10-12 | A kind of high intensity formed punch and tooth root strengthening and processing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610891653.2A CN107937688B (en) | 2016-10-12 | 2016-10-12 | A kind of high intensity formed punch and tooth root strengthening and processing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107937688A true CN107937688A (en) | 2018-04-20 |
| CN107937688B CN107937688B (en) | 2019-08-02 |
Family
ID=61928819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610891653.2A Active CN107937688B (en) | 2016-10-12 | 2016-10-12 | A kind of high intensity formed punch and tooth root strengthening and processing device |
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| Country | Link |
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| CN (1) | CN107937688B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107937702A (en) * | 2016-10-12 | 2018-04-20 | 清华大学 | A kind of device for being used to implement the tooth root of gear intensive treatment |
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| CN101817056A (en) * | 2010-04-28 | 2010-09-01 | 哈尔滨工业大学 | Device and method for self-piercing riveting of half-hole rivet loaded by pulse magnet field force |
| CN102967511A (en) * | 2012-11-29 | 2013-03-13 | 哈尔滨工业大学 | Device and method for testing impact toughness of material |
| CN107937702A (en) * | 2016-10-12 | 2018-04-20 | 清华大学 | A kind of device for being used to implement the tooth root of gear intensive treatment |
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| EP0293257A2 (en) * | 1987-05-27 | 1988-11-30 | Peter B. Zieve | An electromagnetic pulse actuator |
| JPH0873930A (en) * | 1994-09-12 | 1996-03-19 | Honda Motor Co Ltd | Method for highly strengthening metallic member |
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| JP2006105352A (en) * | 2004-10-08 | 2006-04-20 | Nippon Steel Corp | Gear having superior fatigue characteristics and its fatigue characteristics improving method |
| CN101817056A (en) * | 2010-04-28 | 2010-09-01 | 哈尔滨工业大学 | Device and method for self-piercing riveting of half-hole rivet loaded by pulse magnet field force |
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| CN107937702A (en) * | 2016-10-12 | 2018-04-20 | 清华大学 | A kind of device for being used to implement the tooth root of gear intensive treatment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107937702A (en) * | 2016-10-12 | 2018-04-20 | 清华大学 | A kind of device for being used to implement the tooth root of gear intensive treatment |
| CN107937702B (en) * | 2016-10-12 | 2019-08-02 | 清华大学 | A kind of tooth root for gear implements the device of intensive treatment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107937688B (en) | 2019-08-02 |
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