CN110076336A - A kind of powder metallurgy high velocity compacted molded test method - Google Patents
A kind of powder metallurgy high velocity compacted molded test method Download PDFInfo
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- CN110076336A CN110076336A CN201910380445.XA CN201910380445A CN110076336A CN 110076336 A CN110076336 A CN 110076336A CN 201910380445 A CN201910380445 A CN 201910380445A CN 110076336 A CN110076336 A CN 110076336A
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- powder
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- magnechuck
- high velocity
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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
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- Mechanical Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention provides a kind of powder metallurgy high velocity compacted molded test method, comprising the following steps: A: preparation, and acquisition needs the installation of the powder metallurgy and high velocity compacted molded test assembly of devices tested to fix；B: the high velocity compacted molded test assembly of devices specific structure includes bracket assembly, is fixed with electric block at the top of the bracket assembly；Wherein the halliard in the electric block is connected and fixed with magnechuck, and magnechuck magnetizing and demagnetizing controller compatible with the magnechuck is additionally provided on the bracket assembly；Wherein the magnechuck is connected and fixed with counterweight component；Wherein the counterweight component is arranged right below powder compacting mould bases component；C；It fills out powder work: pressed powder is filled into former；D: being promoted to certain altitude for block stamp, so that electric permanent-magnet suction disc is magnetized the upper surface that magnechuck drops to block stamp；E: it is tested: adjusting the height of block stamp free-falling respectively, carry out being pressed downward that test data is made.
Description
Technical field
The present invention relates to powder metallurgy forming field more particularly to a kind of powder metallurgy high velocity compacted molded test methods.
Background technique
PM technique is the advanced components an of energy-saving material-saving, environmental protection, high-efficient, at low cost, close (net) forming
Manufacturing technology, product are widely used to the fields such as machinery, power electronics, automation, aerospace, automobile, military affairs.Wherein
Powdered metallurgical material is the most key in practical applications to be to maintain high-performance, and high density is high performance basis, thus close
Degree measures the most important index of powdered metallurgical material, and the comprehensive performance and green compact compactness of material have close relationship, high
Yield strength, ultimate tensile and the fatigue that material can be improved in green compact compactness are strong, obtain at present according to following table
| Technique | Density (g/cm3) | Relative cost |
| Tradition compacting | 7.1 | 100% |
| Multiple pressure/resintering | 7.4 | 150% |
| Temperature and pressure (1500C) | 7.3 | 125% |
| Forging | 7.8 | 200% |
| High velocity compacted | 7.5 | 100% |
| Multiple pressure/the resintering of high velocity compacted- | 7.7 | 150% |
When tradition compacting, the compactness of product can not be significantly improved by carrying out repeatedly compacting to body of powder.
The above equipment of swedish company manufacture using unique hydraulic shock structure, and uses hyperpressure hydraulic oil, matches
The standby hydraulic and pneumatic system improved with top grade, but since hydraulic shock system pipeline is complicated, bulky structure is complicated, whole
Machine involves great expense, also not high enough in pressing speed, the presence of these problems, so that domestic colleges and universities and R&D institution carry out this skill
The research and extension work of art is more difficult.
Summary of the invention
The present invention provides a kind of powder metallurgy high velocity compacted molded test method, is replaced using gravitional force as way of energy storage
In generation, requires harsh hydraulic or other driving method, carries out high shape and tests and carry out in time data acquisition, convenient for research with
Operation.
The present invention is achieved by the following technical solutions: a kind of powder metallurgy high velocity compacted molded test method, including
Following steps: A: the installation of preparation, powder metallurgy and high velocity compacted molded test assembly of devices that acquisition needs to test is solid
It is fixed, wherein the high velocity compacted molded test device mounting apparatus includes bracket assembly, counterweight component, permanent magnetic chuck and impact mould
Have assembly, wherein bracket is always high: 450cm, block stamp hoisting depth 300cm, block stamp quality 50*2kg, electric block 0.9KW,
Lifting weight is more than or equal to 250kg,；
B: the high velocity compacted molded test assembly of devices specific structure includes bracket assembly, and the top of the bracket assembly is fixed
Equipped with electric block；Wherein the halliard in the electric block is connected and fixed with magnechuck, is also set on the bracket assembly
There is magnechuck magnetizing and demagnetizing controller compatible with the magnechuck；Wherein the magnechuck connect solid with counterweight component
It is fixed；Wherein the counterweight component is arranged right below powder compacting mould bases component；
The powder compacting mould bases component includes the mould bases backing plate, mould bases cushion block, lower template, cope plate set gradually from top to bottom
It is oriented to upper punch；Wherein the lower template is arranged right below spoke type sensor；Wherein sensor cushion block insertion setting exists
In the lower template；The left and right ends of the lower template are equipped with mould bases cushion block；Wherein the cope plate is fixed on the mould bases pad
The top of block；Wherein the cope plate passes through the fixed former of former pressing plate；Wherein upper punch is located at top and the cunning of the former
Dynamic setting is in upper punch guiding；Wherein one end of bottom punch is located in the former and the other end is fixed at activity
Cushion block；Wherein the upper punch and bottom punch lower part are equipped with pressure sensor；
C；It fills out powder work: carrying out filling out powder work after mold is installed, pressed powder is filled into former first, is wanted at this time
Pay attention to ensuring that powder is uniformly freely fallen in negative impression, is struck off powder along the upper surface of former with smooth scraping blade；It takes
Powder cushion block is filled out under bottom punch out, upper punch is inserted into the empty negative impression formed because the decline of powder gasket powder is filled out in taking-up；
Remove the extra powder in former upper surface；
D: being promoted to certain altitude for block stamp, presses the declines button of electric block, and magnechuck is dropped to the upper table of block stamp
Face, then pin the magnetizing button of magnechuck and do not put, so that electric permanent-magnet suction disc is magnetized；After magnechuck is attracted block stamp, press
The rising button of electric block promotes block stamp and puts safe shelf well to the top of safe shelf, then the decline of electric block is pressed
Block stamp is stably placed on safe shelf by button；All of above work complete and check it is errorless after press the upper of electric block
Button is risen, block stamp is promoted to the height needed, spreads back safe shelf, guarantee that block stamp is unobstructed during decline；It is inhaled by electromagnetism
The demagnetization button of disk is not put, and block stamp, which falls, after magnechuck demagnetization carries out high velocity compacted movement；
E: it is tested: adjusting the height of block stamp free-falling respectively, carry out being pressed downward that test data is made.
Further: the magnechuck is electric permanent-magnet structure, and by forward and reverse to electricity, completion is magnetized with demagnetization to reach
Suction design standard to actuation and release, electric permanent-magnet suction disc to block stamp is >=500kg.
Further: being 12m/min in the promotion speed of high velocity compacted molded test device block stamp.
Further: the draw ratio l/d1 of the stamping is greater than 6；Block stamp and upper punch diameter ratio d2/d1 are smaller,
The stress concentration of upper punch upper surface also will be smaller, and when block stamp is equal with upper punch diameter, it is 1 that stress concentration, which is minimized,
The service life of stamping is by longest at this time.
Further: the bottom plate of the bracket assembly is equipped with damping stabilising arrangement, and the damping stabilising arrangement includes subtracting
Shake backing plate and reinforcing rod；One end of the reinforcing rod and the shock-absorption backing plate are connected and fixed and the other end passes through bottom plate and the branch
The side of frame assembly is connected and fixed.
Impact energy is transferred on powder by work of the present invention by pressing mold from press, in the moment of high velocity compacted, due to weight
It hammers quality and impact velocity into shape and impact energy and material densityization is closely related.And different compacting energy can then pass through tune
Different weight combinations are saved to obtain；Different impact velocitys can adjust the acquisition of block stamp height of drop by magnechuck；Two
Sensor acquires the specific data of upper punch and bottom punch respectively, to obtain more accurate pressure peak in the moment of compacting,
Simultaneously in order to detect pressure head and mold stresses situation, needs to paste foil gauge on mold, collect accurate experimental data, from
And obtain the former inner wall pressure regularity of distribution in surge and pressing process.
Powder high-speed pressing and forming equipment is to ensure that the weight free-falling of connection quilt, so weight is just when falling
The weight being connected with wirerope generally cannot be promoted using motor is promoted by excessive frictional force, common hoisting way,
Such that the tractive force due to wirerope by weight drop acts in weight freely falling body, reverse motor by force,
This will generate biggish frictional force, it is possible to damage promotes motor, and there are errors with true freely falling body situation.
The conducting wire of the characteristic and energization that combine ferromagnetic material absorption iron as a result, has magnetic electromagnetic principles, this experimental provision is matched
For widely used magnechuck.The advantages that electric-controlled permanent magnetic chuck is due to safe and reliable, practical and efficient, energy conservation and environmental protection, can be with
By being powered or powering off, so that magnechuck has magnetic or loses magnetism in moment.It is hung so being processed when designing weight
Hole, for connecting the wirerope for promoting motor, to promote or decline magnechuck and weight.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is powder compacting mould bases component drawings of the present invention；
Fig. 3 is the structural schematic diagram of counterweight component of the present invention；
Wherein 1- bracket assembly, 2- electric block, 3- magnechuck, 4- magnechuck magnetizing and demagnetizing controller, 5- counterweight component, 6-
Mould bases backing plate, 7- mould bases cushion block, 8- lower template, 9- cope plate, 10- upper punch guiding, 11- sensor cushion block, 12- mould bases pad
Block, 13- cavity plate pressing plate, 14- former, 15- upper punch, 16- bottom punch, 17- movable cushion block, 21- spoke type sensor, 22- pressure
Force snesor, 23- shock-absorption backing plate, 24- reinforcing rod, 25- elastic rod.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings:
It is as shown in Figs. 1-3: a kind of powder metallurgy high velocity compacted molded test method of the present embodiment, comprising the following steps: A: quasi-
Standby work, acquisition needs the installation of the powder metallurgy and high velocity compacted molded test assembly of devices tested to fix, wherein the height
Fast compression moulding experimental rig installation equipment includes bracket assembly, counterweight component, permanent magnetic chuck and Impact mould assembly, wherein propping up
Frame is always high: 450cm, block stamp hoisting depth 300cm, block stamp quality 50*2kg, electric block 0.9KW, lifting weight are greater than etc.
In 250kg,；
B: the high velocity compacted molded test assembly of devices specific structure includes bracket assembly 1, and the top of the bracket assembly 1 is solid
Surely it is equipped with electric block 2；Wherein the halliard in the electric block 2 is connected and fixed with magnechuck 3, the bracket assembly 1
On be additionally provided with magnechuck magnetizing and demagnetizing controller 4 compatible with the magnechuck 3；The wherein magnechuck 3 and weight
Component 5 is connected and fixed；Wherein the counterweight component 5 is arranged right below powder compacting mould bases component；
The powder compacting mould bases component include the mould bases backing plate 6 set gradually from top to bottom, mould bases cushion block 7, lower template 8, on
Template 9 and upper punch guiding 10；Wherein the lower template 8 is arranged right below spoke type sensor 21；Wherein sensor cushion block
11 insertions are arranged in the lower template 8；The left and right ends of the lower template 8 are equipped with mould bases cushion block 12；The wherein cope plate 9
It is fixed on the top of the mould bases cushion block 12；Wherein the cope plate 9 passes through the fixed former 14 of former pressing plate 13；Wherein upper punch
15 are located at the top of the former 14 and are slidably arranged in the upper punch guiding 10；Wherein one end of bottom punch 16 is located at institute
It states in former 14 and the other end is fixed at movable cushion block 17；Wherein the upper punch 15 and 16 lower part of bottom punch are equipped with pressure
Force snesor 22；The bottom plate of the bracket assembly 1 is equipped with damping stabilising arrangement, and the damping stabilising arrangement includes shock-absorption backing plate
23 and reinforcing rod 24；One end of the reinforcing rod 24 be connected and fixed with the shock-absorption backing plate 23 and the other end pass through bottom plate with it is described
The side of bracket assembly 1 is connected and fixed.
C；It fills out powder work: carrying out filling out powder work after mold is installed, pressed powder is filled into former first, this
When it is noted that ensure that powder is uniformly freely fallen in negative impression, powder is scraped along the upper surface of former with smooth scraping blade
It is flat；It takes out and fills out powder cushion block under bottom punch, upper punch is inserted into the empty former formed because the decline of powder gasket powder is filled out in taking-up
It is intracavitary；Remove the extra powder in former upper surface；
D: being promoted to certain altitude for block stamp, presses the declines button of electric block, and magnechuck is dropped to the upper table of block stamp
Face, then pin the magnetizing button of magnechuck and do not put, so that electric permanent-magnet suction disc is magnetized；After magnechuck is attracted block stamp, press
The rising button of electric block promotes block stamp and puts safe shelf well to the top of safe shelf, then the decline of electric block is pressed
Block stamp is stably placed on safe shelf by button；All of above work complete and check it is errorless after press the upper of electric block
Button is risen, block stamp is promoted to the height needed, spreads back safe shelf, guarantee that block stamp is unobstructed during decline；It is inhaled by electromagnetism
The demagnetization button of disk is not put, and block stamp, which falls, after magnechuck demagnetization carries out high velocity compacted movement；
E: it is tested: adjusting the height of block stamp free-falling respectively, carry out being pressed downward that test data is made；In high velocity compacted
The promotion speed of molded test device block stamp is 12m/min.
Embodiment one:
After the mechanical part of whole device and software systems installation and debugging, carried out in this powder high-speed pressing and forming device
Experimental implementation, low diffusivity alloy steel powder (1300WB) is used in experimentation, and specific targets are shown in Table 3.2- table 3.4.
The compacting of table 3.2 uses low diffusivity alloy steel powder main component
Tab 3.2 Main components of under-dispersion steel alloy powder for
suppress use
| Ingredient | C | Si | Mn | P | S | Ni | Mo | Cu | O | Fe |
| Content (weight percent) | 0.004 | 0.027 | 0.096 | 0.012 | 0.010 | 1.773 | 0.441 | 1.545 | 0.11 | Remaining |
The distribution of 3.3 powder size of table
Table 3.3 Powder particle size distribution
| Granular size | -180−+150 | -150−+106 | -106−+75 | -75−+45 | -45 |
| Weight % | 4.2 | 20.4 | 21.3 | 29.5 | 24.6 |
3.4 powder technology performance of table
Tab 3.4 The properties of powder technology
Experimentation
Testing impact hammer head and quality can be selected is 50-100kg；Jump bit can be set to maximum height: 3.5,
Therefore maximum speed is reachable, and: 8.283m/s tests filling amount are as follows: 8-10g, sample structure are the cylinder that diameter is 16mm
Body.
Impact energy is obtained by formula E=mgh, and jump bit speed is by formulaIt obtains, whereinm For impact
Hammer quality into shape,g For acceleration of gravity,h For jump bit height.
The weight of jump bit is 50kg, and the charge weight of powder is each 8g in mold, is computed, can obtain:
3.5 jump bit setting height of table and relevant parameter
Tab 3.5 The set height of the driven hammer and corresponding parameters
| Jump bit height (m) | Speed (m/s) | Impact energy (J) | Active force (KN) | Active force (Kg) |
| 0.5 | 3.130 | 245 | 40.820 | 4165.306 |
| 1.0 | 4.427 | 490 | 81.659 | 8332.551 |
| 1.5 | 5.422 | 735 | 122.492 | 12499.184 |
| 2.0 | 6.260 | 980 | 163.281 | 16661.327 |
| 2.5 | 7.000 | 1225 | 204.166 | 20833.265 |
| 3.0 | 7.668 | 1470 | 244.992 | 24999.183 |
| 3.5 | 8.283 | 1715 | 285.867 | 29170.102 |
Experimental result
It is 50kg that the weight of jump bit is selected in this experiment, and filling amount is low diffusivity alloy steel powder (1300WB) powder of 8g
End is fitted into mold, and Fig. 3 .20 is that the sample of experimentation high speed compacting is in kind.
The specific height of experiment and experimental result are shown in Table 3.6.
3.6 sample density test result of table
Tab 3.6 Density test results of sample
It is suppressed on powder high-speed pressing and forming device using low diffusivity alloy steel powder, to further investigate this
The actual effect of device, to experimental result progress, analysis shows, relevant experimental data meets needs of expected design.
Selection is produced using Jinan Sigmar Technology Co., Ltd. in the test macro of powder high-speed pressing and forming device
SLM-4 type intelligent load tester.The Specifications of tester are respectively as follows: 4, load test channel；Precision is 0.5%；
ADC resolution ratio is 16；Dynamic range is 100dB；Channel sample frequency: 5-12000 Hz meets design requirement.
Claims (5)
1. a kind of powder metallurgy high velocity compacted molded test method, it is characterised in that: the following steps are included: A: preparation is adopted
Collection needs the installation of the powder metallurgy and high velocity compacted molded test assembly of devices tested to fix, wherein the high velocity compacted forms
It includes bracket assembly, counterweight component, permanent magnetic chuck and Impact mould assembly that experimental rig, which installs equipment, and wherein bracket is always high:
450cm, block stamp hoisting depth 300cm, block stamp quality 50*2kg, electric block 0.9KW, lifting weight are more than or equal to
250kg,；
B: the high velocity compacted molded test assembly of devices specific structure includes bracket assembly (1), the top of the bracket assembly (1)
Portion is fixed with electric block (2)；Wherein the halliard in the electric block (2) is connected and fixed with magnechuck (3), described
The compatible magnechuck magnetizing and demagnetizing controller (4) with the magnechuck (3) is additionally provided on bracket assembly (1)；It is wherein described
Magnechuck (3) is connected and fixed with counterweight component (5)；Wherein the counterweight component (5) is arranged right below powder compacting mould bases
Component；
The powder compacting mould bases component includes the mould bases backing plate (6) set gradually from top to bottom, mould bases cushion block (7), lower template
(8), cope plate (9) and upper punch guiding (10)；Wherein the lower template (8) is arranged right below spoke type sensor (21)；
Wherein sensor cushion block (11) insertion setting is in the lower template (8)；The left and right ends of the lower template (8) are equipped with mould bases pad
Block (12)；Wherein the cope plate (9) is fixed on the top of the mould bases cushion block (12)；Wherein the cope plate (9) passes through yin
Moulded board (13) is fixed former (14)；Wherein upper punch (15) is located at the top of the former (14) and is slidably arranged on described
Stamping is oriented in (10)；Wherein one end of bottom punch (16) is located in the former (14) and the other end is fixed at activity mat
Block (17)；Wherein the upper punch (15) and bottom punch (16) lower part are equipped with pressure sensor (22)；
C；It fills out powder work: carrying out filling out powder work after mold is installed, pressed powder is filled into former first, is wanted at this time
Pay attention to ensuring that powder is uniformly freely fallen in negative impression, is struck off powder along the upper surface of former with smooth scraping blade；It takes
Powder cushion block is filled out under bottom punch out, upper punch is inserted into the empty negative impression formed because the decline of powder gasket powder is filled out in taking-up；
Remove the extra powder in former upper surface；
D: being promoted to certain altitude for block stamp, presses the declines button of electric block, and magnechuck is dropped to the upper table of block stamp
Face, then pin the magnetizing button of magnechuck and do not put, so that electric permanent-magnet suction disc is magnetized；After magnechuck is attracted block stamp, press
The rising button of electric block promotes block stamp and puts safe shelf well to the top of safe shelf, then the decline of electric block is pressed
Block stamp is stably placed on safe shelf by button；All of above work complete and check it is errorless after press the upper of electric block
Button is risen, block stamp is promoted to the height needed, spreads back safe shelf, guarantee that block stamp is unobstructed during decline；It is inhaled by electromagnetism
The demagnetization button of disk is not put, and block stamp, which falls, after magnechuck demagnetization carries out high velocity compacted movement；
E: it is tested: adjusting the height of block stamp free-falling respectively, carry out being pressed downward that test data is made.
2. a kind of powder metallurgy high velocity compacted molded test method according to claim 1, it is characterised in that: the electromagnetism
Sucker is electric permanent-magnet structure, by forward and reverse to electricity, is completed to magnetize with demagnetization to reach actuation to block stamp and release, electricity forever
The suction design standard of magnetic-disc is >=500kg.
3. a kind of powder metallurgy high velocity compacted molded test method according to claim 1, it is characterised in that: in high ram compression
The promotion speed that type experimental rig block stamp is made is 12m/min.
4. a kind of powder metallurgy high velocity compacted molded test method according to claim 1, it is characterised in that: the stamping
Draw ratio l/d1 be greater than 6；Block stamp and upper punch diameter ratio d2/d1 are smaller, and the stress of upper punch upper surface, which is concentrated, also will
Smaller, when block stamp is equal with upper punch diameter, to be minimized be 1 to stress concentration, and the service life of stamping is by longest at this time.
5. a kind of powder metallurgy high velocity compacted molding machine according to claim 1, it is characterised in that: the bracket assembly
(1) bottom plate is equipped with damping stabilising arrangement, and the damping stabilising arrangement includes shock-absorption backing plate (23) and reinforcing rod (24)；It is described
One end and the shock-absorption backing plate (23) of reinforcing rod (24) are connected and fixed and the other end passes through bottom plate and the bracket assembly (1)
Side is connected and fixed.
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| CN201910380445.XA CN110076336A (en) | 2019-05-08 | 2019-05-08 | A kind of powder metallurgy high velocity compacted molded test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113218788A (en) * | 2021-04-29 | 2021-08-06 | 安徽理工大学 | Multi-particle impact crushing experiment platform |
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Application publication date: 20190802 |