CN106424717A - Rare-earth powder high-pressure forming system - Google Patents
Rare-earth powder high-pressure forming system Download PDFInfo
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- CN106424717A CN106424717A CN201610804481.0A CN201610804481A CN106424717A CN 106424717 A CN106424717 A CN 106424717A CN 201610804481 A CN201610804481 A CN 201610804481A CN 106424717 A CN106424717 A CN 106424717A
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- 239000000843 powder Substances 0.000 title claims abstract description 40
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 37
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 37
- 238000006073 displacement reaction Methods 0.000 claims abstract description 57
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000000465 moulding Methods 0.000 claims description 26
- 239000002828 fuel tank Substances 0.000 claims description 13
- 238000009704 powder extrusion Methods 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 20
- 230000033001 locomotion Effects 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000003825 pressing Methods 0.000 abstract description 2
- 230000000630 rising effect Effects 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000009123 feedback regulation Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
Classifications
-
- 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
- B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a rare-earth powder high-pressure forming system, and belongs to the intelligent control field of powder orientating, pressing and forming. An auxiliary hydraulic system which takes a high-sensitivity controllable proportional valve assembly as a core is arranged for product mould-stripping motion control. A modern mechanology, electronics and algorithm integrated technology is combined, and motion displacement information of pistons of upper and lower hydraulic cylinders is acquired throughout the whole process; an industrial programmable controller is taken as a data central processor to judge rising displacement difference of upper and lower pistons, so that a servo motor is controlled in real time in a feed-back mode; and the servo motor drives a precision mechanical device to realize regulation on relative flow at outlets A and B of a proportional valve assembly, so that pistons of the upper and lower cylinders are guaranteed to synchronously rise, and high-density products are smoothly taken out from a concave mould.
Description
Technical field
The present invention relates to powder orientation, compressing field of intelligent control, particularly a kind of rare earth powder high-pressure molding system
System.
Background technology
4.2g/cm3 need to be reached with density of solid after the increase of rare earth permanent-magnetic material demand and orientating products are suppressed
Technological requirement, traditional at present magnetic pole orientation, compressing technique cannot meet the requirement of rare earth permanent-magnetic material.
Traditional magnetic pole orients, the step of compressing technique：
1. manually add powder and enter magnetic pressure machine, sweeping powder makes it smooth；
2. piston motion is compressing, and upper piston rises, and lower piston is motionless；
3. upper piston rises to and goes up most, the shaped article output that lower piston ejection is suppressed first, artificial taking-up；
4. enter into secondary compacting link, static pressure, major part takes oil pressure.
Altogether suppress in two steps, and whole product needed is carried out in the environment of anaerobic, and be full of nitrogen, and work as finished product
When density reaches more than 3.8g/cm3, solid articles can allow deflection little, due to pressure when finished product takes out from upper/lower die
Inequality easily causes damage, and secondary operations could make product density reach the prescription of 4.2g/cm3, its pressing process
Numerous and diverse and finished product density is not enough.
Orient under compressing technique in traditional magnetic pole, when finished product density reaches 3.8g/cm3, depanning qualification rate reaches
The ratio specifying less than enterprise, and the smooth rate of its product design is little, following process reduces it is therefore necessary to enter to the utilization rate of blank
Row secondary operations, nitrogen consumption rate increases, and the process time is greatly improved.
Content of the invention
The goal of the invention of the present invention is, for the problems referred to above, provides a kind of rare earth powder high-pressure molding system, enables to
The hydraulic pressure output control automatically system of the upper and lower hydraulic cylinder piston moving displacement precise synchronization of special magnetic powder material series forcing press
System, obtains one-shot forming, highdensity quality product.
For reaching above-mentioned purpose, the technical solution adopted in the present invention is：A kind of rare earth powder high-pressure molding system, including
Punch, die and the die base plate from top to bottom setting gradually, described punch and die base plate are just dilute to being used on die accommodating
The through hole of native powder, and the extrusion molding completing to rare earth powder that can relative with this through hole slide；Described punch connects makes it
The upper hydraulic cylinder moving up and down, die base plate connects the lower hydraulic cylinder making it move up and down；Described upper hydraulic cylinder and lower hydraulic cylinder
Connect main hydraulic system respectively；Also include for auxiliary hydraulic system, grating displacement sensor, servomotor, executor and place
Reason device；Described auxiliary hydraulic system includes proportioning valve throttling controller, solenoid-operated proportional reversal valve, hydraulic pump, fuel tank and overflow valve；
Described fuel tank, hydraulic pump and solenoid-operated proportional reversal valve P interface are sequentially connected, and solenoid-operated proportional reversal valve A interface connects proportioning valve section
Stream controller input, solenoid-operated proportional reversal valve B interface connects hydraulic cylinder rodless cavity and lower hydraulic cylinder rod chamber, ratio respectively
Reversal valve T interface connects fuel tank；Described overflow valve is arranged between hydraulic pump oil-out and fuel tank；Solenoid-operated proportional reversal valve connects
Processor；Described proportioning valve throttling controller includes proportioning valve, adjustable throttling I, adjustable throttling II and check valve, proportioning valve
Throttling controller input connects the P interface of proportioning valve by adjustable throttling I, by adjustable throttling II connection proportioning valve
T interface；Proportioning valve throttling controller input arranges check valve with proportioning valve A interface, proportioning valve B interface respectively, described unidirectional
Valve turns on towards proportioning valve throttling controller input；Described proportioning valve A interface connects upper hydraulic cylinder rod chamber, the B of proportioning valve
Interface connects lower hydraulic cylinder rodless cavity；Described main hydraulic system drives upper hydraulic cylinder and lower hydraulic cylinder to realize rare earth powder is extruded
After molding, main hydraulic system switches to auxiliary hydraulic system；Described grating displacement sensor is separately mounted to punch and die bottom
On plate, and processor is connected by A/D module；Described processor connects servomotor by D/A module, and servomotor passes through to hold
Row device connects control adjustable throttling I and adjustable throttling II respectively；Described executor is reducing gear.
Here, the grating displacement sensor of precision is respectively mounted on die base plate, punch, hydraulic cylinder on Real-time Collection,
Lower hydraulic cylinder piston displacement information；And with die floor shifting as reference, calculate between mold process concave baffle plate and punch
The relative variation of distance.Device is dealt with using industrial programmable controller PLC, is equipped with digital-to-analogue conversion, analog-to-digital conversion module, real
When process grating information；Its result feedback control servomotor starts, and drives precision optical machinery executor.Precision optical machinery is held
Row device is used for connecting servo motor output shaft and adjustable throttling I, adjustable throttling II, is lived according to upper hydraulic cylinder, lower hydraulic cylinder
The interpolation change of plug displacement, on the basis of proportioning valve B interface channel capacity is metastable, quickly, accurately controls proportioning valve A
Interface egress channel capacity, and then realize upper hydraulic cylinder, the operation of lower hydraulic cylinder synchronous during depanning, prevent pressure uneven to one-tenth
Type finished product causes to damage.Meanwhile, the liquid supply rate of hydraulic system can be regulated and controled as needed by solenoid-operated proportional reversal valve；And ratio
Valve throttling controller then by processor real-time monitoring, realize to upper hydraulic cylinder, lower hydraulic cylinder flow precise control so that punch
In the case of ensureing to shaping finished product pressure with die base plate, synchronizing moving, thus ensure shaping finished product not because pressure is uneven
Depanning failure.Comparative example valve A, B interface output control be can ensure that using two adjustable adjustable throttlings I, adjustable throttling II,
The output of proportioning valve A interface can only be controlled simultaneously as needed, only control the output of proportioning valve B interface, control ratio simultaneously
Three kinds of accurate adjustment patterns such as valve A interface and B interface output, realize the power oil of hydraulic system in conjunction with solenoid-operated proportional reversal valve
The flow-control of road and oil return circuit is it is ensured that rare earth powder depanning is smoothed out.
Preferably, described processor is industrial Programmable Logic Controller.
Preferably, described hydraulic pump is unidirectional quantitative plunger pump.
Preferably, described solenoid-operated proportional reversal valve is 3-position 4-way solenoid-operated proportional reversal valve.
Preferably, described upper hydraulic cylinder and lower hydraulic cylinder are band spring reset piston rod cylinder.
Preferably, also include feeding module, described feeding module is oppositely arranged on above die, and connects processor.
A kind of auxiliary mold stripping method of rare earth powder high-pressure molding system, described main hydraulic system drive on hydraulic cylinder and
After lower hydraulic cylinder is realized to rare earth powder extrusion molding, main hydraulic system is switched to auxiliary hydraulic system by described processor；Institute
State the zeros data that grating displacement sensor is conveyed by processor；Described processor controls solenoid-operated proportional reversal valve to switch to A to connect
Mouth output, is arranged on grating displacement sensor action on die base plate and punch, and exports die by A/D module to processor
Floor shifting amount and punch displacement amount；Processor is poor according to the displacement to both of die floor shifting amount and punch displacement amount
It is worth, and Regulate signal is converted into according to displacement difference and described servomotor is exported by D/A module feedback；
The rotating speed startup that Regulate signal sets pressed by described servomotor, slows down through executor and output corner controls scalable
Stream valve I and/or adjustable throttling II, and then adjust the output of proportioning valve A interface, until described displacement difference is zero, processor
Processor controls servomotor to stop；Circulation above-mentioned steps, until the rare earth powder product of molding integrally deviates from die, processor
Solenoid-operated proportional reversal valve A interface and B interface is controlled to switch to final state.
During depanning, punch and die base plate is needed to be synchronized with the movement, and due in existing apparatus, the flow of hydraulic cylinder
Control and inaccurately lead to mold process punch and die base plate usually asynchronous, such as move past fast or excessively slow etc., all on punch
Finished product depanning can be led to damaged.Above-mentioned depanning householder methods are by the pattern displacement sensing being arranged on punch and die base plate
Device, obtains hydraulic cylinder and the displacement of lower hydraulic cylinder indirectly, and grating displacement sensor is by die floor shifting amount and punch displacement
Amount is sent to processor by A/D module, and processor contrasts both displacement differences and can obtain going up hydraulic cylinder in real time
With lower hydraulic cylinder displaced condition.Punch during switching auxiliary hydraulic system and die base plate direct range are set to normal pitch
From that is, rare earth powder is squeezed into the size after finished product；On the basis of die floor shifting amount, according to the positive and negative of displacement difference and
Size is known that hydraulic cylinder and lower hydraulic cylinder displaced condition：When displacement difference is zero, upper hydraulic cylinder and lower hydraulic cylinder
Between distance be gauged distance, or says synchronizing moving operation；Displacement difference be on the occasion of when, upper hydraulic cylinder and lower hydraulic cylinder it
Between distance be more than gauged distance, upper hydraulic cylinder is moved through soon, and both are asynchronous；Displacement difference be negative value when, upper hydraulic cylinder and
Between lower hydraulic cylinder, distance is less than gauged distance, and upper hydraulic cylinder is moved through slowly, and both are asynchronous.Processor is according to displacement difference
It is converted into regulated quantity, when such as displacement difference is zero, be not adjusted；Displacement difference be on the occasion of when, by regulated quantity pass through D/A
Module feedback exports described servomotor, and servomotor starts according to regulated quantity, and servomotor drives precision optical machinery executor,
Slowed down by executor and adjust the operation that adjustable throttling I realizes reduction proportioning valve A interface flow, until the position that processor obtains
Shifting amount difference is zero, and processor stops sending Regulate signal to servomotor.According to different needs can also adjusted in concert can
Flow regulating valve I, adjustable throttling II or solenoid-operated proportional reversal valve, to ensure upper hydraulic cylinder and lower hydraulic cylinder precise synchronization.Above-mentioned
In scheme, the precise control to punch and die base plate movement is achieved it is ensured that going out mold process punch and die by feedback regulation
Base plate applies pressure uniformly to finished product, prevents finished product from damaging due to unbalance stress.
Due to adopting technique scheme, the invention has the advantages that：
1. the present invention ensure that mechanical compaction product obtains the 4.2g/cm of technical requirements3Above density, and product goes out
Mould certified products reach the ratio that enterprise specifies.
2. the present invention increases mechanical pressure, once-forming in rigid matrix, can obtain through machinery, hydraulic oil static pressure two
Second compression shapes more regular product design, improves the utilization rate to blank for the following process.
3. the present invention cancels the operations such as the necessary packaging of secondary pressure, static pressure, cleaning, product is greatly shortened in production line
On transport distance, reduce the space needing oxygen barrier, effectively reduce nitrogen consumption.
4. present invention saves machinery, all materials of the secondary forming process of static pressure and manpower consumption；Once-forming direct
Enter sintering high temperature stove, process time is greatly shortened.
5. the present invention increases special depanning hydraulic channel, technological transformation on the basis of retaining traditional original technological process of press
Risk reaches minimum, and the depth beneficial to enterprise's existing equipment technological transformation is implemented；Technological process after simplification, is advantageously implemented life
Output bas line and guarantee run stablize.
6. the present invention passes through the auxiliary hydraulic system with high sensitivity proportion-controllable valve module as core for the setting, for product
Depanning motor control.In conjunction with modern mechanical, electrical, calculation integrated technique, by gathering the whole upper and lower hydraulic cylinder piston motion bit of the demoulding
Shifting amount information；Data central processing unit is made by industrial Programmable Logic Controller, judges that upper and lower piston rises displacement difference, in real time
Feedback control servomotor；Servomotor drives precision optical machinery device, realizes the tune that comparative example valve module A, B export relative discharge
Whole it is ensured that upper and lower cylinder piston synchronous rise, high density product is smoothly taken out from die.Intelligence control system actual motion is tied
Fruit shows, the relative error that die base plate, punch synchronously rise displacement is less than ± 0.15mm, reaches technological requirement allowable value.
Brief description
Fig. 1 is die pressure forming technology filler schematic diagram；
Fig. 2 is die pressure forming technology shaping schematic view；
Fig. 3 is die pressure forming technology depanning schematic diagram；
Fig. 4 is product depanning moving displacement control schematic diagram of the present invention；
Fig. 5 is present system illustrative view of functional configuration.
1- die, 2- punch, 3- die base plate, the upper hydraulic cylinder of 4-；Hydraulic cylinder, 6- fuel tank, 7- hydraulic pump, 8- electromagnetism under 5-
Proportional reversing valve, 9- proportioning valve throttling controller, 10- adjustable throttling I, 11- adjustable throttling II, 12- check valve, 13- ratio
Example valve, 14- overflow valve, 15- processor, 16- servomotor, 17- executor.
Specific embodiment
Below in conjunction with accompanying drawing to invention be embodied as further illustrate.
As shown in Figure 1 to Figure 3, be mould pressure forming process schematic diagram in prior art, include successively filler, molding,
Depanning.Feed as shown in Figure 1 and suppress, powder is packed in die 1, with special scraper plate smooth powder surface.As shown in Figure 2
Die 1 both sides electromagnetic poles energising, makees directional process, punch 2 is simultaneously descending to powder magnetic pole, produces high pressure by powder with discharging top board
End is compressing.Finished product depanning as shown in Figure 3, die base plate 3, the synchronous rising of punch 2, overall process keeps equidistantly.Product goes out
Mold process punch 2 remains contact with product it is therefore intended that preventing from causing rib because of die 1 wall and product relative motion resistance
Side is damaged.But due to driving the synchronization control of die base plate 3, two hydraulic cylinder piston ascending motions of punch 2 in prior art
Not, the two-piston relative displacement margin of error is more than the elastic range that high density finished product allows to precision processed, leads to finished product depanning damaged.
As shown in Fig. 4 to Fig. 5, it is a kind of rare earth powder high-pressure molding system disclosed by the invention, specifically has high-precision
The system of degree auxiliary rare earth fine powder product depanning.This system includes punch 2, die 1 and the die bottom from top to bottom setting gradually
Plate 3, punch 2 and die base plate 3 are just used for accommodating the through hole of rare earth powder on die 1, and being capable of slip relative with this through hole
Complete the extrusion molding to rare earth powder.Punch 2 connects the upper hydraulic cylinder 4 making it move up and down, and die base plate 3 connects to be made thereon
The lower hydraulic cylinder 5 of lower movement；Described upper hydraulic cylinder 4 and lower hydraulic cylinder 5 connect main hydraulic system respectively.It is right that main hydraulic system is used for
The extrusion molding that upper hydraulic cylinder 4 and lower hydraulic cylinder 5 feed flow make punch 2 and die base plate 3 completes to rare earth powder, and molding
Product reaches 4.2g/cm3Above density.Main hydraulic system in Fig. 5 has been left out, and its structure setting refers to existing skill
Art.
If Fig. 4 is product depanning moving displacement control schematic diagram of the present invention, for avoiding hydraulic cylinder during depanning can not be synchronous, lead
Cause finished product depanning damaged, be respectively mounted grating displacement sensor on punch 2, die base plate 3 here, for reacting upper hydraulic cylinder
4 and the misalignment of lower hydraulic cylinder 5.Here the punch 2 during rare earth powder molding and die base plate 3 direct range are set to mark
Quasi- distance, that is, rare earth powder be squeezed into the size after finished product；During moving on punch 2 and die base plate 3, both distances can not
Deviate gauged distance.
As shown in figure 5, be present system illustrative view of functional configuration, including for punch 2, die 1, die base plate 3,
Hydraulic cylinder 4, lower hydraulic cylinder 5, auxiliary hydraulic system, grating displacement sensor, servomotor 16, executor 17 and processor 15.
Auxiliary hydraulic system includes proportioning valve throttling controller 9, solenoid-operated proportional reversal valve 8, hydraulic pump 7, fuel tank 6 and overflow valve 14；This
In fuel tank 6, hydraulic pump 7 and solenoid-operated proportional reversal valve 8P interface be sequentially connected, solenoid-operated proportional reversal valve 8A interface connects proportioning valve
Throttling controller 9 input, solenoid-operated proportional reversal valve 8B interface connects hydraulic cylinder 4 rodless cavity respectively and lower hydraulic cylinder 5 has bar
Chamber, proportional reversing valve T interface connects fuel tank 6.Described overflow valve 14 is arranged between hydraulic pump 7 oil-out and fuel tank 6；Electromagnetism ratio
Example reversal valve 8 is also connected with processor 15.Proportioning valve throttling controller 9 includes proportioning valve 13, adjustable throttling I 10, adjustable throttling
Valve II 11 and check valve 12, proportioning valve throttling controller 9 input by adjustable throttling I 10 connect proportioning valve 13 P interface,
Connect the T interface of proportioning valve 13 by adjustable throttling II 11；Proportioning valve throttling controller 9 input respectively with proportioning valve 13A
Interface, proportioning valve 13B interface setting check valve 12, described check valve 12 is led towards proportioning valve throttling controller 9 input.Ratio
Valve 13A interface connects upper hydraulic cylinder 4 rod chamber, and the B interface of proportioning valve 13 connects lower hydraulic cylinder 5 rodless cavity.
Here grating displacement sensor is separately mounted on punch 2 and die base plate 3, and is processed by A/D module connection
Device 15；Described processor 15 connects servomotor 16 by D/A module, and servomotor 16 connects control respectively by executor 17
Adjustable throttling I 10 and adjustable throttling II 11；Described executor 17 is reducing gear.Wherein, main hydraulic system drives upper liquid
After cylinder pressure 4 and lower hydraulic cylinder 5 are realized to rare earth powder extrusion molding, main hydraulic system switches to auxiliary hydraulic system.
In above-mentioned, hydraulic pump 7 is unidirectional quantitative plunger pump；Solenoid-operated proportional reversal valve 8 commutates for 3-position 4-way solenoid-operated proportional
Valve 8；Upper hydraulic cylinder 4 and lower hydraulic cylinder 5 are band spring reset piston rod cylinder.
The operation principle of such scheme is：The grating displacement sensor of precision is respectively mounted on die base plate 3, punch 2,
Hydraulic cylinder 4, lower hydraulic cylinder 5 piston displacement information on Real-time Collection；And with die base plate 3 displacement as reference, calculate mold process
The relative variation of distance between concave baffle plate 3 and punch 2.Device 15 is dealt with using industrial programmable controller PLC, is equipped with
Digital-to-analogue conversion, analog-to-digital conversion module, real-time processing grating information；Its result feedback control servomotor 16 starts, and drives
Dynamic precision optical machinery executor 17.Precision optical machinery executor 17 be used for connecting servomotor 16 output shaft and adjustable throttling I 10, can
Flow regulating valve II 11, according to the interpolation change of upper hydraulic cylinder 4, lower hydraulic cylinder 5 amount of piston displacement, in proportioning valve 13B interface channel
On the basis of flow is metastable, quickly, accurately control proportioning valve 13A interface egress channel capacity, and then realize out mold process
In upper hydraulic cylinder 4, lower hydraulic cylinder 5 run simultaneously, prevent that pressure is uneven to be caused to shaping finished product to damage.
Here a kind of auxiliary mold stripping method of rare earth powder high-pressure molding system is disclosed based on such scheme, walk including following
Suddenly：
(1), after on main hydraulic system drives, hydraulic cylinder 4 and lower hydraulic cylinder 5 are realized to rare earth powder extrusion molding, process
Main hydraulic system is switched to auxiliary hydraulic system by device 15；The zeros data that grating displacement sensor is conveyed by processor 15.
(2) processor 15 controls solenoid-operated proportional reversal valve 8 to switch to A interface to export, and is arranged on die base plate 3 and punch 2
Upper grating displacement sensor action, and die base plate 3 displacement and punch 2 displacement are exported to processor 15 by A/D module；
Processor 15 according to the displacement difference to both of die base plate 3 displacement and punch 2 displacement, and according to displacement difference
It is converted into Regulate signal and described servomotor 16 is exported by D/A module feedback.
(3) servomotor 16 is started by the rotating speed that Regulate signal sets, and slows down through executor 17 and output corner control can
Flow regulating valve I 10 and/or adjustable throttling II 11, and then adjust the output of proportioning valve 13A interface, until described displacement difference is
Zero, processor 15 processor 15 controls servomotor 16 to stop.
(4) circulation above-mentioned steps (2), (3), until the rare earth powder product of molding integrally deviates from die 1, processor 15 is controlled
Solenoid-operated proportional reversal valve 8A interface processed and B interface switch to final state.
In above-mentioned steps (2), (3), product depanning campaign is initial, and lower cylinder rises from rodless cavity oil-feed, piston；Upper cylinder half is from having
Rod cavity oil-feed, piston rises；Because oil suction chamber volume difference necessarily leads to punch 2 rate of climb fast, die base plate 3, punch 2 spacing
Increase, more than the standard value setting.Servomotor 16 obtains control signal, positive startup, and adjustable throttling II 11 is constant, simultaneously
By adjusting adjustable throttling I 10 timely reduction A mouth flow；Now punch 2 rate of climb declines, between die base plate 3, punch 2
Away from reducing and tend to gauged distance.When die base plate 3, punch 2 spacing are reduced to gauged distance, servomotor 16 is controlled to stop；
Due to the impact of flow inertia, of short duration reverse starting made by servomotor 16, and suppression die base plate 3, punch 2 spacing subtract further
Little, keep gauged distance.The rest may be inferred, and servomotor 16 starts positive, carries out next and controls circulation；Until product integrally takes off
Go out die 1, system sends termination signal.
Described above is the detailed description for the preferable possible embodiments of the present invention, but embodiment is not limited to this
Bright patent claim, the equal change being completed under the technical spirit suggested by all present invention or modification change, all should belong to
In the covered the scope of the claims of the present invention.
Claims (7)
1. a kind of rare earth powder high-pressure molding system, including the punch from top to bottom setting gradually, die and die base plate, described
Punch and die base plate are just to being used on die accommodating the through hole of rare earth powder, and can slip relative with this through hole complete to dilute
The extrusion molding of native powder；Described punch connects the upper hydraulic cylinder making it move up and down, and die base plate connects makes it move up and down
Lower hydraulic cylinder；Described upper hydraulic cylinder and lower hydraulic cylinder connect main hydraulic system respectively；It is characterized in that：Also include for assisting
Hydraulic system, grating displacement sensor, servomotor, executor and processor；
Described auxiliary hydraulic system includes proportioning valve throttling controller, solenoid-operated proportional reversal valve, hydraulic pump, fuel tank and overflow valve；
Described fuel tank, hydraulic pump and solenoid-operated proportional reversal valve P interface are sequentially connected, and solenoid-operated proportional reversal valve A interface connects proportioning valve section
Stream controller input, solenoid-operated proportional reversal valve B interface connects hydraulic cylinder rodless cavity and lower hydraulic cylinder rod chamber, ratio respectively
Reversal valve T interface connects fuel tank；Described overflow valve is arranged between hydraulic pump oil-out and fuel tank；Solenoid-operated proportional reversal valve connects
Processor；
Described proportioning valve throttling controller includes proportioning valve, adjustable throttling I, adjustable throttling II and check valve, proportioning valve section
Stream controller input is connected the P interface of proportioning valve, is connected the T of proportioning valve by adjustable throttling II by adjustable throttling I
Interface；Proportioning valve throttling controller input arranges check valve, described check valve with proportioning valve A interface, proportioning valve B interface respectively
Towards the conducting of proportioning valve throttling controller input；Described proportioning valve A interface connects upper hydraulic cylinder rod chamber, and the B of proportioning valve connects
Mouth connects lower hydraulic cylinder rodless cavity；
After described main hydraulic system drives upper hydraulic cylinder and lower hydraulic cylinder realizes to rare earth powder extrusion molding, main hydraulic system is cut
It is changed to auxiliary hydraulic system；
Described grating displacement sensor is separately mounted on punch and die base plate, and connects processor by A/D module；
Described processor connects servomotor by D/A module, and servomotor passes through executor and connects the adjustable throttling of control respectively
Valve I and adjustable throttling II；Described executor is reducing gear.
2. a kind of rare earth powder high-pressure molding system according to claim 1 it is characterised in that：Described processor is industry
Programmable Logic Controller.
3. a kind of rare earth powder high-pressure molding system according to claim 1 it is characterised in that：Described hydraulic pump is unidirectional
Quantitative plunger pump.
4. a kind of rare earth powder high-pressure molding system according to claim 1 it is characterised in that：Described solenoid-operated proportional commutation
Valve is 3-position 4-way solenoid-operated proportional reversal valve.
5. a kind of rare earth powder high-pressure molding system according to claim 1 it is characterised in that：Described upper hydraulic cylinder and under
Hydraulic cylinder is band spring reset piston rod cylinder.
6. a kind of rare earth powder high-pressure molding system according to claim 1 it is characterised in that：Also include feeding module,
Described feeding module is oppositely arranged on above die, and connects processor.
7. a kind of rare earth powder high-pressure molding system according to claim 1 auxiliary mold stripping method it is characterised in that：?
After described main hydraulic system drives upper hydraulic cylinder and lower hydraulic cylinder realizes to rare earth powder extrusion molding, described processor is by main liquid
Pressure system switches to auxiliary hydraulic system；The zeros data that grating displacement sensor is conveyed by described processor；Described processor
Control solenoid-operated proportional reversal valve to switch to A interface to export, be arranged on grating displacement sensor action on die base plate and punch, and
Die floor shifting amount and punch displacement amount are exported to processor by A/D module；Processor according to die floor shifting amount and
The displacement difference to both of punch displacement amount, and Regulate signal is converted into by D/A module feedback according to displacement difference
Export described servomotor；
The rotating speed startup that Regulate signal sets pressed by described servomotor, slows down through executor and output corner controls adjustable throttling
I and/or adjustable throttling II, and then adjust the output of proportioning valve A interface, until described displacement difference is zero, processor is processed
Device controls servomotor to stop；Circulation above-mentioned steps, until the rare earth powder product of molding integrally deviates from die, processor controls
Solenoid-operated proportional reversal valve A interface and B interface switch to final state.
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| CN114986971A (en) * | 2022-05-07 | 2022-09-02 | 昆明理工大学 | Powder pressing mechanism, controllable pressing device and high-flux powder pressing machine |
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| CN106424717B (en) | 2018-10-30 |
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