CN107937688B - A kind of high intensity formed punch and tooth root strengthening and processing device - Google Patents
A kind of high intensity formed punch and tooth root strengthening and processing device Download PDFInfo
- Publication number
- CN107937688B CN107937688B CN201610891653.2A CN201610891653A CN107937688B CN 107937688 B CN107937688 B CN 107937688B CN 201610891653 A CN201610891653 A CN 201610891653A CN 107937688 B CN107937688 B CN 107937688B
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- formed punch
- gear
- tooth root
- added
- pedestal
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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-intensitive formed punches, for impacting the surface of the tooth root of gear, the formed punch (3) includes copper driving piece, intermetallic metal part and formed punch ontology, the intermetallic metal part connects the copper driving piece and the formed punch ontology, close to the coil (22) for generating the pulsed magnetic field, the formed punch ontology is made the copper driving piece of martensitic precipitation.The invention also discloses a kind of tooth root strengthening and processing devices.
Description
Technical field
The present invention relates at gear intensive treatment technical field more particularly to a kind of high-intensitive formed punch and a kind of tooth root reinforcing
Manage device.
Background technique
Extend the flexible life of gear to improve the bending fatigue strength of gear, currently, generally use surface
The mode of processing introduces residual compressive stress layer to the tooth root of gear.The residual compressive stress layer for being applied to root surface is believed to
Generated tensile stress generates interaction when with working gear, thus reduce the stress amplitude of root surface, it will be so that maximum etc.
The position of efficacy is mobile to the inside of gear, and the crackle for being finally able to suppress root surface generates and extension.
Currently, a variety of gear surface reinforcement techniques can be realized the introducing of residual compressive stress layer, carried out according to strengthening mechanism
Classification can be divided into phase transformation strengthening, chemical strengthening and mechanical enhancer.Wherein, phase transformation strengthening all refers to complex with chemical strengthening
Heat treatment process, heat treatment can bring biggish deformation and poor surface accuracy, and phase transformation strengthening and chemical strengthening
Treatment process 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, causes the plastic deformation of root surface by the impact force of bullet, in turn
Introduce residual stress layer.On the basis of shot-peening, the surface shot blasting strengthenings 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 repeatedly in a device, returns
The energy transmission of ultrasonic vibration to root surface is formed plastic deformation and residual stress layer by bullet.Laser peening is then in gear
Surface is coated with specific coatings, and partial coating vaporized expanding is made by way of induced with laser, generates huge impact force to rush
Root surface is hit, residual stress layer is eventually introduced.
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
Not applicable and tooth root environment, the specific aim strengthened for tooth root is not strong, and efficiency is relatively low.The unit time of laser peening is capable of handling
Work surface limited area, corresponding higher cost, it is difficult to be applied in industrial production.It will be apparent that strong using shot-peening
Change technology is implemented to strengthen to tooth root has that effect is poor and efficiency is lower.
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, can be used big quality formed punch to impact the surface peening mode of tooth root, while making using electromagnetic field
For the driving source of compound punch, formed punch receives the electromagnetic force generated in pulsed magnetic field, under the action of electromagnetic force and then can be past
Multiple mobile, the reciprocating movement of formed punch can impact the tooth root of work gear to be added, the plastic deformation of Lai Yinfa root surface, and then introduce
Residual stress layer.
But this scheme is during realization, formed punch is during impacting tooth root and strengthening, intensity to formed punch and tired
Labor performance requirement is higher, how to ensure the intensity and fatigue behaviour of formed punch, becomes those skilled in the art's technology urgently to be resolved
Problem.
Summary of the invention
The first purpose of the invention is to provide a kind of high-intensitive formed punches, to solve how to ensure the intensity and fatigue of formed punch
The problem of performance.
A second object of the present invention is to provide a kind of tooth root strengthening and processing devices with above-mentioned high-intensitive formed punch.
In order to realize above-mentioned first purpose, the invention provides the following technical scheme:
A kind of high intensity formed punch, the surface of the tooth root for impacting gear, the formed punch include copper driving piece, intermetallic metal
Part and formed punch ontology, the intermetallic metal part connect the copper driving piece and the formed punch ontology, and the copper driving piece is close to use
In the coil for generating the pulsed magnetic field.
Preferably, the copper driving piece, the intermetallic metal part are bolted with the formed punch ontology.
High intensity formed punch provided by the invention is made of martensitic precipitation, since formed punch ontology is formed punch
Main part and formed punch hit the part of tooth root, therefore formed punch ontology needs to have biggish intensity, higher fatigability
It can require, and (its yield strength has excellent martensitic precipitation intensity with higher up to 2.5Gpa or more)
Good thermal fatigue resistance and corrosion resistance, for this purpose, present invention can assure that the intensity and fatigue behaviour of formed punch.
In order to realize above-mentioned second purpose, the invention provides the following technical scheme:
A kind of tooth root strengthening and processing device, including charge-discharge control system, punch driver, formed punch, positioning device and
Striking gear；Wherein:
The punch driver includes pedestal and coil；Coil setting on the base, and with the charge and discharge
Electric control system is connected, for generating pulsed magnetic field；
The formed punch setting on the base, and can be moved back and forth relative to the pedestal；The formed punch with it is to be processed
The tooth socket 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 formed punch packet
Copper driving piece, intermetallic metal part and formed punch ontology are included, the intermetallic metal part connects the copper driving piece and the formed punch ontology,
The copper driving piece is close to the coil for generating the pulsed magnetic field, and the formed punch ontology is using martensitic precipitation hardening stainless
Steel is made.
The positioning device is used to support the work gear to be added for being threaded through in the axis hole of the work gear to be added；
The striking gear is described to be added for stirring when the formed punch is in evacuation state for engaging with the work gear to be added
Work gear is rotated around the positioning device.
Preferably, the striking gear is rack drives mechanism or gear driven mechanism, the tooth of the rack drives mechanism
Item or the gear of the gear driven mechanism are engaged with the work gear to be added.
Preferably, the rack drives mechanism includes rack gear and track, and the rack gear is slidably matched with the track, described
Rack gear 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 nanotube coiling.
Preferably, the pedestal includes first and second, and described second is articulated with described first, and with it is described
Coil is connected with the formed punch；Described second can drive the formed punch along the circuit oscillation of the work gear to be added.
It preferably, further include the limiting device being set on described second, the limiting device is used for and the formed punch
Cooperation is limited in the tail portion of the formed punch.
It preferably, further include elastic component；The elastic component is arranged between the limiting device and the formed punch.
It preferably, further include pedestal driving device, the pedestal driving device is for driving the pedestal to drive the punching
Head switches between its evacuation state and working condition.
Tooth root strengthening and processing device provided by the invention in the process of work, charge-discharge control system to coil charges,
So that coil electrification generates pulsed magnetic field, formed punch under the action of pulsed magnetic field by electromagnetic force, and then can be past relative to pedestal
Multiple mobile, the reciprocating movement of formed punch can generate the tooth root for impacting work gear to be added.Formed punch is deposited in the operating condition can bump
Work gear to be added introduces residual stress layer to tooth root in turn, plays the purpose for reinforcing tooth root.When formed punch is corresponding under a certain state
Tooth socket in tooth root be reinforced after completion, formed punch retraction and enter evacuation state, formed punch is exited from tooth socket at this time, is stirred
Device works meeting so that work gear to be added rotates, so that next tooth socket is corresponding with formed punch, formed punch enters next punching
Enhance process is hit, until the tooth root of work gear to be added is reinforced completing.
It can be seen that tooth root strengthening and processing device provided by the invention 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.
Detailed description of the invention
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, the accompanying drawings in the following description is only one recorded in the present invention
A little embodiments are also possible to obtain other drawings based on these drawings for those of ordinary skill in the art.
Fig. 1 is the structural schematic 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 structural schematic diagram of coil provided in an embodiment of the present invention；
Fig. 3 is the arrangement schematic diagram of pedestal upper spring provided in an embodiment of the present invention.
Specific embodiment
In order to make those skilled in the art more fully understand technical solution of the present invention, below in conjunction with attached drawing to this hair
It is bright to be further detailed.
Referring to FIG. 1, a kind of high-intensitive formed punch 3 provided by the invention, the surface of the tooth root for impacting gear, the punching
First 3 are arranged on pedestal 21, and can move back and forth relative to the pedestal 21；The tooth socket phase of the formed 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 formed punch 3 includes that copper drives piece, centre
Metalwork and formed punch ontology, the intermetallic metal part connect the copper driving piece and the formed punch ontology, and the copper driving piece leans on
The nearly coil 22 for being used to generate the pulsed magnetic field.
It can be bolted between above-mentioned three.Since formed punch ontology is the main part and formed punch 3 of formed punch 3
The part of tooth root is hit, therefore formed punch ontology needs to have biggish intensity, higher fatigue behaviour requirement, and martensitic precipitation
Hardening stainless steel intensity with higher is (its yield strength up to 2.5Gpa or more), with excellent thermal fatigue resistance and resistance to
Corrosive nature.For this purpose, formed punch ontology can be made of martensitic precipitation.
Fig. 1-Fig. 3 is please referred to, the embodiment of the present invention provides a kind of device that the tooth root implementation for gear is strengthened.It is mentioned
The device of confession includes charge-discharge control system 1, punch driver 2, formed punch 3, positioning device 4 and stirs device.
The effect of punch driver 2 is that driving formed punch 3 moves, and punch driver 2 includes pedestal 21 and coil 22, line
Circle 22 is arranged on pedestal 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
Constantly generating size in card coil 22 is about 10T, the pulsed magnetic field that pulse length is about 20ms.
Formed punch 3 is usually made of high-intensitive material, and formed punch 3 is arranged on pedestal 21, and can be past relative to pedestal 21
It is multiple mobile, i.e., prismatic pair is formed between the two.Formed punch 3 is opposite with the tooth socket 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.
Positioning device is used to support work gear 5 to be added for being threaded through in the axis hole of 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 formed punch 3 is in evacuation state and is rotated around positioning device.The application
In, positioning device 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 gear or gear driven mechanism
Gear rotates that work gear 5 to be added is driven to rotate, to realize that formed punch 3 is in opposite shape from the different tooth sockets of work gear 5 to be added
State, and then prepare for the subsequent impacts of formed punch 3.
In the process of work, charge-discharge control system 1 charges device provided in an embodiment of the present invention to coil 22, so that
The electrification of coil 22 generates pulsed magnetic field, and formed punch 3 can be reciprocal relative to pedestal 21 by electromagnetic force under the action of pulsed magnetic field
Mobile, the reciprocating movement of formed punch 3 can impact the tooth root of work gear 5 to be added.In the application, there are evacuation states and work for formed punch 3
State bump work gear 5 to be added and then can introduce residual stress layer to tooth root under working condition, play the mesh for reinforcing tooth root
's.After tooth root of the formed punch 3 under a certain state in corresponding tooth socket is reinforced completion, formed punch 3 bounces back and enters evacuation shape
State, formed punch 3 is exited from tooth socket at this time, and striking gear can make work gear 5 to be added rotate, so that next tooth socket and punching
First 3 is corresponding, and formed punch 3 enters next impact enhance process, until the tooth root of work gear 5 to be added is reinforced completing, is reinforcing
During work, when necessary, work gear 5 to be added can be packed into positioning device from another side by operator, thus to close
The tooth root in the face is implemented to reinforce.
It can be seen that the root provided in an embodiment of the present invention for gear by the above-mentioned course of work and implement reinforcing
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 mentions
The device of confession is able to solve that implement efficiency existing for intensive treatment to tooth root using blasting technology at present lower and effect is poor
Problem.
Referring again to Fig. 1, a kind of specific rack drives mechanism 6, including rack gear 61 and track 62, rack gear 61 and track
62 are slidably matched, and rack gear 61 can be moved along track 62, to realize the adjusting of 61 position of rack gear, finally make rack gear 61 be in
The purpose that work gear 5 to be added engages, the collective effect of rack gear 61 and positioning device, so that work gear to be added 5 is in fixed position
It sets, finally implements impact for subsequent formed punch 3 and get ready.Specifically, track 62 can be cross track, easily facilitate pair
The adjusting of 61 position of rack gear.
Coil 22 generates 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 nanotube bifilar-wound.In the process for forming pulsed magnetic field
In, biggish electric current can be generated 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 generating between absorbing coil 22.But since the material of carbon nanotube prepares difficulty, because
This price costly, for this purpose, above-mentioned coil 22 uses copper wire and carbon nanotube bifilar-wound, can not only improve entire coil
22 heat dissipation performance and integral strength, while will not also make the preparation cost of entire coil 22 too high, it is seen then that above-mentioned coil 22
Good cost performance.
In the application, formed punch 3 is usually compound punch, and formed punch 3 can generate vortex, vortex when coil 22 loads and changes
So that formed punch 3 in pulsed magnetic field by great electromagnetic force, electromagnetic force can drive formed punch 3 to move, and reach impact tooth to be processed
The mesh of the tooth root of wheel 5, it is final to realize intensive treatment work.
In the embodiment of the present invention, pedestal 21 may include first 211 and second 212, and second 212 is articulated with first
Portion 211, and be connected with coil 22 and the formed punch 3, second 212 can drive formed punch 3 along the circumferential direction of the work gear 5 to be added
It swings, so that formed punch 3 can impact in a region of tooth root, implements impact as much as possible in biggish region and reinforce
Processing.
Preferably, limiting device 23 is provided on second 212, limiting device 23 is used for formed punch 3 in the tail portion of formed punch 3
Limit cooperation, can absorb movement when formed 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 setting limiting device 23 and formed punch 3 it
Between, buffer function can be preferably played, formed punch 3 is avoided to be in the greater impact generated under backhaul state to limiting device 23.
Elastic component can be spring 24, be also possible to caoutchouc elasticity block.
Device provided in an embodiment of the present invention can also include pedestal driving device 7, and pedestal driving device 7 is for driving bottom
Seat 21 drives formed punch 3 to switch between its evacuation state and working condition.Pedestal driving device 7 can be screw drive mechanism.
Pedestal driving device 7 usually adjusts formed punch 3 in evacuation state and working condition indirectly by adjusting the position of entire pedestal 21
Between switch.
It is above that certain exemplary embodiments of the invention are only described by way of explanation, 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 different 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 (6)
1. a kind of tooth root strengthening and processing device, which is characterized in that including charge-discharge control system (1), punch driver (2),
Formed punch (3), positioning device (4) and striking gear；Wherein:
The punch driver (2) includes pedestal (21) and coil (22)；The coil (22) is arranged in the pedestal (21)
On, and be connected with the charge-discharge control system (1), for generating pulsed magnetic field；The pedestal (21) includes first (211)
With second (212), second (212) are articulated with first (211), and with the coil (22) and the formed punch
(3) it is connected；Described second (212) drive the formed punch (3) along the circuit oscillation of work gear to be added (5)；
The formed punch (3) is arranged on the pedestal (21), and can move back and forth relative to the pedestal (21)；The formed punch
(3) opposite with the tooth socket of the work gear (5) to be added, and the work gear to be added can be impacted under the action of the pulsed magnetic field
(5) tooth root；The formed punch (3) includes copper driving piece, intermetallic metal part and formed punch ontology, described in the intermetallic metal part connection
Copper drives piece and the formed punch ontology, and the copper driving piece is close to the coil (22) for generating the pulsed magnetic field, the punching
Head ontology is made of martensitic precipitation；
The positioning device (4) is used to support the work gear to be added for being threaded through in the axis hole of the work gear to be added (5)
(5)；The striking gear with the work gear (5) to be added for engaging, for dialling when the formed punch (3) is in evacuation state
The work gear to be added (5) is moved to rotate around the positioning device (4).
2. tooth root strengthening and processing device as described in claim 1, which is characterized in that the striking gear is rack drives mechanism
(6) or gear driven mechanism, the rack gear of the rack drives mechanism (6) or the gear of the gear driven mechanism with it is described to be added
Work gear (5) engagement.
3. tooth root strengthening and processing device as claimed in claim 2, which is characterized in that the rack drives mechanism (6) includes tooth
Item (61) and track (62), the rack gear (61) are slidably matched with the track (62), and the rack gear (61) can be along the track
(62) mobile；The track (62) is cross track.
4. tooth root strengthening and processing device as described in claim 1, which is characterized in that further include being set to described second
(212) limiting device (23) on, the limiting device (23) are used to limit with the formed punch (3) in the tail portion of the formed punch (3)
Position cooperation.
5. tooth root strengthening and processing device as claimed in claim 4, which is characterized in that further include elastic component；The elastic component is set
It sets between the limiting device (23) and the formed punch (3).
6. such as tooth root strengthening and processing device as claimed in any one of claims 1 to 5, which is characterized in that further include pedestal driving device
(7), the pedestal driving device (7) is for driving the pedestal (21) that the formed punch (3) is driven 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 |
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| Publication Number | Publication Date |
|---|---|
| CN107937688A CN107937688A (en) | 2018-04-20 |
| CN107937688B true CN107937688B (en) | 2019-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| 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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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| 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 |
| 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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2016
- 2016-10-12 CN CN201610891653.2A patent/CN107937688B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN2625070Y (en) * | 2003-05-23 | 2004-07-14 | 西安保中科工贸有限公司 | Variable magnetic force extrusion press |
| 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 |
| 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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