CN107790714B - A kind of assisting demolding device in powder pressing technique - Google Patents
A kind of assisting demolding device in powder pressing technique Download PDFInfo
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- CN107790714B CN107790714B CN201710944277.3A CN201710944277A CN107790714B CN 107790714 B CN107790714 B CN 107790714B CN 201710944277 A CN201710944277 A CN 201710944277A CN 107790714 B CN107790714 B CN 107790714B
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- former
- end cap
- magnetic conduction
- punch
- cantilever
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/093—Compacting only using vibrations or friction
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
Abstract
The invention discloses the assisting demolding devices in a kind of powder pressing technique.Including bottom punch, upper punch and former, bottom punch is fixedly mounted on pedestal, upper punch is arranged above bottom punch, powder material is filled in the space that upper punch, bottom punch and former are constituted, it further include cantilever, vibrating spring and ultra-magnetic telescopic vibration excitor, two sides above former have additional cantilever, former oscilaltion campaign synchronous with cantilever, two cantilevers are respectively provided with vibrating spring and vibrator between bottom surface and former top surface, vibrator upper end is connected to cantilever bottom surface by vibrating spring, and vibrator lower end touches former top surface.The present invention can reduce the frictional force between outer coating powder and die wall, and the generation of defect, keeps the internal density of green compact more uniform, reduce internal stress, to reduce green compact strain cracking phenomenon when reducing demoulding.
Description
Technical field
The present invention relates to the assisting demolding devices in a kind of powder-pressing process using vibration excitor.Precisely, it is related to
A kind of reduce defect assisting demolding device in powder pressing technique.
Technical background
Powder metallurgy is that a kind of stock utilization, product design freedom are all very high, can produce many other preparation sides
Method is difficult to a kind of technology with property material and part produced.As the most important application of powder metallurgy and powder
One of the important procedure of metallurgy component manufacture, powder metallurgy formation are a kind of to make loose powder raw material by specific method
Form the technique with certain size, shape and intensity briquet.There are mainly two types of the methods wherein shaped, press molding and nothing
Pressing formation.Press molding is essential step for most of powder metallurgy products, is wherein used in press molding
Most common is exactly die forming, is referred to as suppressed.Compacting is put into a certain amount of powder in the pressing die of one precise measure,
The formed punch that powder is moved later is pressed into the process of green compact with high pressure.Powder can be generated perpendicular to pressing mold wall in pressing process
Lateral pressure, wherein the outer coating powder close to die wall can produce frictional force and metal between die wall under the action of lateral pressure
When by pressing formation, flowing or plastic deformation can be generated, and then has amount of powder and enters between the former of mold and stamping
In fit clearance.Gap in compression mold device currently used in the market is substantially all in 0.008mm or more, this interstice coverage
It is relatively to be also easy to produce defect.This filing effect of frictional force and powder between outer coating powder and side wall is lacked when causing demoulding
Sunken major reason.Generating for defect can generate significant impact to the mechanical precision of institute's product.In addition to this, outer coating powder and mould
Frictional force between wall can make green compact generate pressure drop in short transverse.Pressure is unevenly distributed so that green compact internal density is distributed
Unevenly, and then on the performance of green compact or even product there is highly important influence.And powder particle produces during compacting
Different degrees of elasticity and plastic deformation are given birth to, so that very big internal stress is produced in green compact, so that green compact is in abjection pressing mold
After can expand, which is known as elastic after effect, is one of the main reason of green compact deformation, cracking.
Be mainly to the research of defect at present how to remove or reduce after the reason of defect occurs and defect occur, and
It is fewer and fewer on how to the research and the method that effectively reduce defect during production of articles, therefore powder compacting and de-
The problem of how reducing defect in mold process is urgently to be resolved.
Summary of the invention
In order to solve the problems, such as background technique, the invention proposes the auxiliary in a kind of powder pressing technique
Stripper apparatus is provided specific frequency low amplitude vibrations in powder-pressing process using vibration excitor and carries out assisted demoulding, improves product
Quality.
In order to meet the above requirements, the present invention adopts the following technical scheme that:
The present invention includes bottom punch, upper punch and former, and bottom punch is fixedly mounted on pedestal, above bottom punch in arrangement
Stamping, powder material are filled in the space that upper punch, bottom punch and former are constituted, and further include cantilever, vibrating spring and super magnetic
Flexible vibration excitor is caused, the two sides above former have additional cantilever, and former oscilaltion campaign synchronous with cantilever, two cantilevers are respectively
Vibrating spring and vibrator are provided between bottom surface and former top surface, vibrator upper end is connected to cantilever bottom by vibrating spring
Face, vibrator lower end touch former top surface.
The present invention makes former generate vibration in pressing process by setting vibrator and cantilever, so that it is de- to carry out auxiliary
Mould considerably increases the Forming Quality of compacting product, and the defect for reducing compacting product generates.
The vibrator uses ultra-magnetic telescopic vibration excitor or piezoelectric vibration exciter.
The ultra-magnetic telescopic vibration excitor include output rod, end cap, screw, shell, bias coil, driving coil, on
Magnetic conduction end cap, upper magnetizer, GMM rod, lower magnetic conduction end cap, lower magnetizer and support spring, shell lower ending opening and connection end cap,
Shell upper end is provided with the port passed through for cable, and shell upper surface is connected to cantilever bottom surface through vibrating spring；Shell it is hollow
Be equipped with magnetic conduction end cap and lower magnetic conduction end cap in inner cavity, upper magnetic conduction end cap abutting is connected to shell inner top surface, upper magnetic conduction end cap and
Mounting arrangements have centrally located GMM rod and are wound on bias coil and the driving of GMM rod outside between lower magnetic conduction end cap
Coil, GMM rod upper end are connected to upper magnetic conduction end cap through upper magnetizer, and GMM rod lower end is connected to output rod through lower magnetizer, defeated
Rod is outer across extension end lid after the central through hole of lower magnetic conduction end cap and end cap and is connected to former top surface；It is equipped in the middle part of output rod
Flange, for flange between lower magnetic conduction end cap and end cap, flange is connected to the central through hole hole end surface of lower magnetic conduction end cap, flange and
It is set with support spring outside output rod between end cap, support spring both ends are connected respectively to flange and end cap.
The length of the bottom punch is greater than former thickness.
The input control signal of two ultra-magnetic telescopic vibration excitors is identical.
When non-compacted, the vibrating spring is initially at pre-compressed state, the branch of the ultra-magnetic telescopic vibration excitor
Support spring is also at pre-compressed state.
The vibrating spring selects disc spring.
The output rod of the ultra-magnetic telescopic vibration excitor is that low amplitude vibrations up and down are done along pressing direction.
All it is deburring after the completion of compacting in the prior art, comes treatment articles surface and carry out assisted demoulding.The present invention is
It is vibrated in pressing process and carrys out assisted demoulding, so that the products surface quality directly obtained is more smooth, reduce what defect occurred
Probability.
Basic principle of the invention is to make former using ultra-magnetic telescopic vibration excitor during powder is suppressed and is demoulded
Generate along pressing direction low frequency low amplitude vibrations so that the frictional force between powder outer layer and former wall substantially reduces and former and
The powder partial exfoliation of upper and lower stamping gap filling, to efficiently reduce the generation of defect.
Selected ultra-magnetic telescopic vibration excitor working principle is as follows: alternating current is passed through to the friendship of ultra-magnetic telescopic vibration excitor
To generate driving magnetic field in stream driving coil, DC current is passed through bias coil and generates bias magnetic field, is driven by adjusting
The value of electric current adjusts the size of driving magnetic field and then changes the length of GMM rod, and the active force of the flexible and spring of GMM rod makes
It obtains mandril generation to stretch or contract, so that power output and displacement, realize the conversion of electromagnetic energy to mechanical energy.
In powder compacting and knockout course, apply certain signal to ultra-magnetic telescopic vibration excitor, produces its output rod
The raw low amplitude vibrations along pressing direction specific frequency.Output rod is in contact with former, and former is made also to keep the small size of the same direction
Vibration.Compared with traditional compacting stripping means, keep the former of low amplitude vibrations that can greatly reduce between outer coating powder and die wall
Frictional force, the powder filled in former and stamping gap can also be fallen by part vibration, and quantity is reduced, and can thus reduce demoulding
When defect generation.And the low amplitude vibrations of former reduce green compact in the pressure drop of short transverse, make the internal density of green compact
More uniformly, internal stress is reduced, to reduce green compact strain cracking phenomenon.
The beneficial effects of the present invention are:
(1) so that former is kept the low amplitude vibrations of specific frequency using ultra-magnetic telescopic vibration excitor, substantially reduce outer layer powder
Frictional force and the powder filled in former and stamping gap between end and die wall can also be fallen by part vibration, so that when demoulding
Defect greatly reduces.
(2) so that former is kept the low amplitude vibrations of specific frequency using ultra-magnetic telescopic vibration excitor, reduce green compact in height
The pressure drop in direction keeps the internal density of green compact more uniform, reduces internal stress, so that it is existing to reduce green compact strain cracking
As.
(3) assisting demolding device is designed based on powder compacting stripper apparatus is widely used now, convenient to carry out
Installation and the repacking to existing equipment.
(4) amplitude of ultra-magnetic telescopic vibration excitor and frequency can adjust according to the actual situation, and adaptability is good.
Detailed description of the invention
Fig. 1 is the structure principle chart of assisting demolding device of the present invention.
Fig. 2 is the structure principle chart of ultra-magnetic telescopic vibration excitor in the present invention.
In figure: 1. cantilevers, 2. vibrating springs, 3. ultra-magnetic telescopic vibration excitors, 4. formers, 5. bottom punches, 6. pedestals, 7. powder
End, 8. upper punch, 9. output rods, 10. end caps, 11. screws, 12. shells, 13. bias coils, 14. driving coils are led on 15.
Magnetic end cap, magnetizer on 16., 17.GMM stick, 18. lower magnetic conduction end caps, 19. lower magnetizers, 20. support springs.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in Figure 1, present invention specific implementation includes press, bottom punch 5, upper punch 8, former 4, cantilever 1, vibration bullet
Spring 2 and ultra-magnetic telescopic vibration excitor 3, press have first hydraulic cylinder and second hydraulic cylinder, and press two sides are equipped with vertically
Guide post, bottom punch 5 is fixedly mounted on pedestal 6, upper punch 8 is arranged above bottom punch 5, former 4 is horizontally disposed, powder material
It is filled in the space that upper punch 8, bottom punch 5 and former 4 are constituted, upper punch 8 is connect with the first hydraulic cylinder of press, upper mold
Punching 8 is carried out pressing operation to powder by the driving of first hydraulic cylinder.
Former 4 opens the hole slot placed for powder material, bottom punch 5 and upper punch 8 respectively in hole slot upper and lower, former 4
The two sides of top have additional cantilever 1, the oscilaltion campaign synchronous with cantilever 1 of former 4, and two respective bottom surfaces of cantilever 1 and former 4 push up
Vibrating spring 2 and vibrator are provided between face, vibrator upper end is connected to 1 bottom surface of cantilever, vibrator by vibrating spring 2
Lower end touches 4 top surface of former.
In specific implementation, the horizontal both ends of former 4 are sleeved on two guide posts of press two sides, and two guide posts are also set with
There is cantilever 1, cantilever 1 and former 4 are fixedly connected with the second hydraulic cylinder of press, are driven by second hydraulic cylinder and drive 4 He of former
Cantilever 1 synchronizes oscilaltion campaign.
Vibrator uses ultra-magnetic telescopic vibration excitor, and ultra-magnetic telescopic vibration excitor 3 includes output rod 9, end cap 10, screw
11, shell 12, bias coil 13, driving coil 14, upper magnetic conduction end cap 15, upper magnetizer 16, GMM rod 17, lower magnetic conduction end cap 18,
Lower magnetizer 19 and support spring 20,12 lower ending opening of shell and connection end cap 10, end cap are connect with shell by four screws
Together, 12 upper end of shell is provided with the port passed through for cable, and 12 upper surface of shell is connected to 1 bottom of cantilever through vibrating spring 2
Face；Magnetic conduction end cap 15 and lower magnetic conduction end cap 18 are equipped in the hollow cavity of shell 12, the upper abutting of magnetic conduction end cap 15 is connected to shell
12 inner top surface of body, mounting arrangements have centrally located GMM rod 17 and coiling between upper magnetic conduction end cap 15 and lower magnetic conduction end cap 18
Bias coil 13 and driving coil 14 in 17 outside of GMM rod, 17 upper end of GMM rod are connected to upper magnetic conduction through upper magnetizer 16
End cap 15,17 lower end of GMM rod are connected to output rod 9 through lower magnetizer 19, and output rod 9 passes through lower magnetic conduction end cap 18 and end cap 10
Extension end lid 10 is outer after central through hole and is connected to 4 top surface of former；Flange is equipped in the middle part of output rod 9, flange is located at lower magnetic conduction end
Lid 18 and end cap 10, flange are connected to the central through hole hole end surface of lower magnetic conduction end cap 18, the output rod 9 between flange and end cap 10
It is set with support spring 20 outside, 20 both ends of support spring are connected respectively to flange and end cap 10.
Coil uses the independent connection of twin coil, two groups of coils is wound on bobbin, the number of turns of coiling is identical, wherein one
Coil generates excitation field as driving coil, and an other coil connects regulated power supply as bias coil, generates dynamic
Adjustable bias magnetic field, bias magnetic field can improve electromechanical coupling factor to avoid frequency multiplication phenomenon.
When non-compacted, vibrating spring 2 is initially at pre-compressed state, and the support spring 20 of ultra-magnetic telescopic vibration excitor is also located
In pre-compressed state.Specific implementation passes through the output rod 9 that the identical control signal of sending controls two ultra-magnetic telescopic vibration excitors
Same low amplitude vibrations up and down are done along pressing direction, so that in pressing process and former is allowed to be vibrated in knockout course.
The course of work of the invention is as follows:
As shown in Figure 1, powder 7 is filled out in the cavity space that bottom punch 5 and former 4 are constituted according to aequum, starting
It does not indicate that display pushes upper punch 8 in first hydraulic cylinder figure, powder is suppressed.
Start to open ultra-magnetic telescopic vibration excitor 3 while compacting, since magnetostriction vibration excitor 3 is mounted on 4 He of former
Between cantilever, and then former 4 is driven to keep low frequency low amplitude vibrations.
After compacting, ultra-magnetic telescopic vibration excitor 3 is kept it turning on, and start first hydraulic cylinder, so that upper punch 8 is upward
It exits, closes first hydraulic cylinder, remain stationary upper punch 8；
Then, it keeps it turning on ultra-magnetic telescopic vibration excitor 3, starts second hydraulic cylinder, make former 4 and cantilever 1 to moving down
It is dynamic until downtrodden powder 7 all exposes, 4 top surface of former drop to bottom punch top surface and hereinafter, close second hydraulic cylinder with
And ultra-magnetic telescopic vibration excitor 3, the rolled-up stock of powder 7 is taken out, demoulding is completed.
Restart second hydraulic cylinder, when former 4 and cantilever 1 being made to be returned to the position most started, close second hydraulic cylinder,
Repeating above step can be realized continuous compacting demoulding.
As shown in Fig. 2, certain signal is applied to ultra-magnetic telescopic vibration excitor by the opening of the bottom center of shell 12,
Its output rod is set to generate the low amplitude vibrations of specific frequency.
Technical solution of the present invention is not limited to the limitation of above-mentioned specific example, all to make according to the technique and scheme of the present invention
Technology deformation, fall within the scope of protection of the present invention.
Claims (5)
1. the assisting demolding device in a kind of powder pressing technique, including bottom punch (5), upper punch (8) and former (4),
Bottom punch (5) is fixedly mounted on pedestal (6), arranges upper punch (8) above bottom punch (5), powder material is filled in upper punch
(8), in the space that bottom punch (5) and former (4) are constituted, it is characterised in that: further include cantilever (1), vibrating spring (2) and vibration
Device, the two sides above former (4) have additional cantilever (1), former (4) oscilaltion campaign synchronous with cantilever (1), two cantilevers
(1) vibrating spring (2) and vibrator are respectively provided between bottom surface and former (4) top surface, vibrator upper end passes through vibration bullet
Spring (2) is connected to cantilever (1) bottom surface, and vibrator lower end touches former (4) top surface；
Former (4) are made to generate the vibration along pressing direction using vibrator.
2. the assisting demolding device in a kind of powder pressing technique according to claim 1, it is characterised in that: described
Vibrator use ultra-magnetic telescopic vibration excitor or piezoelectric vibration exciter.
3. the assisting demolding device in a kind of powder pressing technique according to claim 2, it is characterised in that: described
Ultra-magnetic telescopic vibration excitor (3) include output rod (9), end cap (10), screw (11), shell (12), bias coil (13), drive
Moving winding (14), upper magnetic conduction end cap (15), upper magnetizer (16), GMM rod (17), lower magnetic conduction end cap (18), lower magnetizer (19)
With support spring (20), shell (12) lower ending opening and connection end cap (10), shell (12) upper end is provided with to be passed through for cable
Port, shell (12) upper surface are connected to cantilever (1) bottom surface through vibrating spring (2)；It is equipped in the hollow cavity of shell (12)
Magnetic conduction end cap (15) and lower magnetic conduction end cap (18), upper magnetic conduction end cap (15) are close to be connected to shell (12) inner top surface, upper magnetic conduction end
Mounting arrangements have centrally located GMM rod (17) and are wound on GMM rod (17) outside between lid (15) and lower magnetic conduction end cap (18)
The bias coil (13) and driving coil (14), GMM rod (17) upper end of surrounding are connected to upper magnetic conduction end cap through upper magnetizer (16)
(15), GMM rod (17) lower end is connected to output rod (9) through lower magnetizer (19), output rod (9) pass through lower magnetic conduction end cap (18) and
Extension end lid (10) outside and is connected to former (4) top surface after the central through hole of end cap (10)；Flange is equipped in the middle part of output rod (9),
For flange between lower magnetic conduction end cap (18) and end cap (10), flange is connected to the central through hole nose end of lower magnetic conduction end cap (18)
It is set with support spring (20) outside output rod (9) between face, flange and end cap (10), support spring (20) both ends are separately connected
To flange and end cap (10).
4. the assisting demolding device in a kind of powder pressing technique according to claim 3, it is characterised in that: non-depressed
When processed, the vibrating spring (2) is initially at pre-compressed state, the support spring (20) of the ultra-magnetic telescopic vibration excitor
It is also at pre-compressed state.
5. the assisting demolding device in a kind of powder pressing technique according to claim 3, it is characterised in that: described
Ultra-magnetic telescopic vibration excitor output rod (9) be done along pressing direction up and down low amplitude vibrations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710944277.3A CN107790714B (en) | 2017-10-12 | 2017-10-12 | A kind of assisting demolding device in powder pressing technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710944277.3A CN107790714B (en) | 2017-10-12 | 2017-10-12 | A kind of assisting demolding device in powder pressing technique |
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| Publication Number | Publication Date |
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| CN107790714A CN107790714A (en) | 2018-03-13 |
| CN107790714B true CN107790714B (en) | 2019-05-14 |
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| CN201710944277.3A Active CN107790714B (en) | 2017-10-12 | 2017-10-12 | A kind of assisting demolding device in powder pressing technique |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111136262A (en) * | 2020-01-16 | 2020-05-12 | 宁波臻鼎机电科技有限公司 | Forming die for magnetic material and pressing method thereof |
| CN113691159A (en) * | 2021-09-03 | 2021-11-23 | 山东大学 | Linear driving mechanism based on giant magnetostriction and shield tunneling machine |
| CN114619029B (en) * | 2022-01-31 | 2022-11-29 | 江苏海曼特电气有限公司 | Compacting die for powder metallurgy production |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55117596A (en) * | 1979-03-05 | 1980-09-09 | Yoshitsuka Seiki:Kk | Powder molding device |
| CN100548511C (en) * | 2006-04-18 | 2009-10-14 | 浙江大学 | A kind of exciting device |
| CN101073832A (en) * | 2007-06-21 | 2007-11-21 | 汪太平 | Method for densifying powdery pressed ingot by vibration |
| CN201618681U (en) * | 2010-04-02 | 2010-11-03 | 宁波大学 | Vibration exciter |
| CN106955998B (en) * | 2017-04-27 | 2020-01-17 | 沈阳远大装备科技有限公司 | Powder blank forming method |
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