CN108480624B - A kind of powder is incremented by pressure setting and drawing method - Google Patents
A kind of powder is incremented by pressure setting and drawing method Download PDFInfo
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- CN108480624B CN108480624B CN201810332265.XA CN201810332265A CN108480624B CN 108480624 B CN108480624 B CN 108480624B CN 201810332265 A CN201810332265 A CN 201810332265A CN 108480624 B CN108480624 B CN 108480624B
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- 239000000843 powder Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 56
- 210000001161 mammalian embryo Anatomy 0.000 claims abstract description 15
- 238000003825 pressing Methods 0.000 claims description 96
- 230000002457 bidirectional effect Effects 0.000 claims description 49
- 230000008569 process Effects 0.000 claims description 45
- 238000005056 compaction Methods 0.000 claims description 19
- 238000000280 densification Methods 0.000 claims description 13
- 238000004080 punching Methods 0.000 claims description 13
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 6
- 230000000875 corresponding effect Effects 0.000 description 36
- 239000002245 particle Substances 0.000 description 5
- 230000001960 triggered effect Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- MFOUDYKPLGXPGO-UHFFFAOYSA-N propachlor Chemical compound ClCC(=O)N(C(C)C)C1=CC=CC=C1 MFOUDYKPLGXPGO-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000005429 filling process Methods 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- RRLHMJHRFMHVNM-BQVXCWBNSA-N [(2s,3r,6r)-6-[5-[5-hydroxy-3-(4-hydroxyphenyl)-4-oxochromen-7-yl]oxypentoxy]-2-methyl-3,6-dihydro-2h-pyran-3-yl] acetate Chemical compound C1=C[C@@H](OC(C)=O)[C@H](C)O[C@H]1OCCCCCOC1=CC(O)=C2C(=O)C(C=3C=CC(O)=CC=3)=COC2=C1 RRLHMJHRFMHVNM-BQVXCWBNSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 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
- B22F3/004—Filling molds with powder
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Fats And Perfumes (AREA)
- Press Drives And Press Lines (AREA)
Abstract
The present invention discloses a kind of powder and is incremented by pressure setting and drawing method, belong to material processing and mechanical equipment technical field, including upper punch, upper punch hydraulic stem, preceding former, former afterwards, former hydraulic stem, bottom punch, stripper plate, stripper plate hydraulic stem, former hydraulic stem servo motor, upper punch hydraulic stem servo motor, stripper plate hydraulic stem servo motor, powder is incremented by compacting compared with primary compacting, in bottom end, consistency is dominant with two aspect performance of average density, so that pressure embryo even density, product final performance improves, the present invention realizes electrical and its automation control, improve production efficiency, reduce production cost, reduce manual work's intensity, improve safety in utilization, in addition to this, by providing high-power mode and low-power mode, reduce energy consumption, it improves efficiency.
Description
Technical Field
The invention relates to a powder incremental pressing device and a pressing method, and belongs to the technical field of material processing and mechanical equipment.
Background
Forming is an essential powder metallurgy process that is second only in importance to sintering, and limits and determines the overall production process of powder metallurgy more than other processes. Whether the forming method is reasonable or not directly determines whether the whole production process can be smoothly carried out or not; influence each subsequent process and the quality of the final product; affecting the automation of production, productivity and production costs.
In the powder pressing process, the porosity of the pressed powder body is reduced, the relative density of the pressed blank is obviously higher than that of the powder body, but along with the application of axial pressure to the powder body, the powder body shows a fluid-like behavior to some extent, acting force is applied to the wall of a female die, so that lateral pressure is generated, friction among powder particles is increased, the pressure transmission is not uniform, so that the densities of different parts in the pressed blank are not uniform, and the final performance of a product is further influenced.
In the prior art, a one-step press forming process is adopted, the problem of uneven blank density of a one-step press formed blank exists, namely the problem of bottom density and average density is particularly prominent, and besides, most of existing equipment has low production efficiency and serious energy consumption.
Disclosure of Invention
The invention provides a powder incremental pressing device which comprises an upper punch 1, an upper punch hydraulic rod 2, a front female die 3, a rear female die 4, a female die hydraulic rod 5, a lower punch 6, a stripper plate 7, a stripper plate hydraulic rod 8, a female die hydraulic rod servo motor 16, an upper punch hydraulic rod servo motor 17 and a stripper plate hydraulic rod servo motor 18, wherein the upper punch 1 and the upper punch hydraulic rod 2 are positioned above the front female die 3 and the rear female die 4, the upper punch 1 is connected with the four upper punch hydraulic rods 2 in a matching manner, the axis of the upper punch 1 is superposed with the central axis of the closed front female die 3 and the closed rear female die 4, the lower punch 6 is arranged below the front female die 3 and the rear female die 4, a stripping opening is formed in the lower punch 6, the stripper plate 7 is arranged on the stripping opening, the four female die hydraulic rods 5 are arranged between the front female die 3 and the rear female die 4, the four female die hydraulic rods 5 are arranged in pairwise symmetry, and the rear female, The lower punch 6 is fixed, the front female die 3 is matched with the four female die hydraulic rods 5 to push the front female die 3 to move, the stripper plate 7 is connected with the stripper plate hydraulic rod 8, and the stripper plate hydraulic rod 8 moves the stripper plate 7; the four upper die hydraulic ram rods 2 are simultaneously driven by an upper die hydraulic ram rod servo motor 17, the four female die hydraulic rams 5 are simultaneously driven by a female die hydraulic ram rod servo motor 16, and the stripper plate hydraulic ram 8 is driven by a stripper plate hydraulic ram rod servo motor 18.
The powder increases progressively suppression device and still includes conveyer belt 9, push pedal 10, push pedal connecting rod 11, guide rail 12, conveyer belt servo motor 14, push pedal connecting rod servo motor 15, conveyer belt 9 sets up 4 next doors at the back bed die, be equipped with guide rail 12 on conveyer belt 9 and the back bed die 4, conveyer belt 9 sets up with push pedal 10 cooperation, push pedal 10 is crossing with conveyer belt 9 at the removal in-process, push pedal 10 is connected with push pedal connecting rod 11, push pedal connecting rod 11 promotes push pedal 10 and removes, push pedal connecting rod 11 sets up 4 sides at the back bed die and with back bed die 4 fixed connection, conveyer belt 9 is driven by conveyer belt servo motor 14, push pedal connecting rod 11 is driven by push pedal connecting rod servo.
The push plate connecting rod 11 is a reciprocating push plate connecting rod.
The powder incremental pressing device comprises an automatic control circuit, wherein the automatic control circuit comprises a control chip 19, a reset circuit 20, a process switch key circuit 21, a mode switching key circuit 22, a conveyor belt unidirectional rotation servo motor circuit 23, a push plate connecting rod unidirectional rotation servo motor circuit 24, a female die hydraulic rod bidirectional rotation servo motor circuit 25, an upper die punching hydraulic rod bidirectional rotation servo motor circuit 26, a stripper plate hydraulic rod bidirectional rotation servo motor circuit 27 and a triode switch circuit 28;
the control chip 19 controls and outputs related instructions and signals, and the model version is not lower than AT89C 52; the reset circuit 20 restores the automatic control circuit to the initial state and is connected to the RST pin of the control chip 19; the process switch key circuit 21 controls whether the device starts to work, is composed of a pair of switch networks, and is also connected with a P1.2 pin of the control chip 19; the mode switching key circuit 22 controls the switching between the high power mode and the low power mode, is composed of two pairs of switch networks, and is also respectively connected with pins P1.0 and P1.1 of the control chip 19; the conveyor belt unidirectional rotation servo motor circuit 23 is connected with the conveyor belt servo motor 14, controls the working condition of the conveyor belt servo motor 14 and is connected with the P2.0 and P2.1 pins of the control chip 19; the push plate connecting rod unidirectional rotation servo motor circuit 24 is connected with the push plate connecting rod servo motor 15, controls the working condition of the push plate connecting rod servo motor 15 and is connected with the P2.2 and P2.3 pins of the control chip 19; the female die hydraulic rod bidirectional rotation servo motor circuit 25 is connected with the female die hydraulic rod servo motor 16, controls the working condition of the female die hydraulic rod servo motor 16, and is connected with pins P2.4 and P2.5 of the control chip 19; the upper die hydraulic ram bidirectional rotation servo motor circuit 26 is connected with the upper die hydraulic ram servo motor 17, controls the working condition of the upper die hydraulic ram servo motor 17, and is connected with pins P2.6 and P2.7 of the control chip 19; the stripper plate hydraulic rod bidirectional rotation servo motor circuit 27 is connected with the stripper plate hydraulic rod servo motor 18, controls the working condition of the stripper plate hydraulic rod servo motor 18, and is connected with pins P1.3 and P1.4 of the control chip 19; the triode switch circuit 28 is respectively connected with the female die hydraulic rod bidirectional rotation servo motor circuit 25 and the upper die hydraulic rod bidirectional rotation servo motor circuit 26, controls the power output modes of the female die hydraulic rod servo motor 16 and the upper die hydraulic rod servo motor 17, and is connected with a P1.5 pin of the control chip 19.
The invention also provides a method for incrementally pressing powder, which is characterized in that according to materials used by a female die and a pressing blank, a friction coefficient table is utilized to inquire the friction coefficient mu at the wall of the die, and a common material elastic modulus (E) -Poisson's ratio (v) table and a formula are utilizedCalculating the lateral pressure coefficient ξ of the mould wall, obtaining the blank pressing radius r and the blank pressing length l through measurement, and converting the blank pressing radius r and the blank pressing length l into the maximum axial stress for local powder densification by utilizing a Huangpeyun pressing formula according to the requirements of the maximum density, the minimum density and the average density of the blank pressingLowest axial stressMean axial directionStressDividing the maximum pressing pressure corresponding to the high power mode and the low power mode of the powder progressive pressing device by the sectional area of the pressing blank of 2 pi r2And then converting to obtain the maximum axial stress for local densification of the powder corresponding to the high-power mode and the low-power mode, and converting to obtain the maximum axial stress for local densification of the powder corresponding to the high-power mode and the low-power mode and the maximum axial stress obtained by converting by using a Huangpeyun pressing formulaComparison is made if the highest axial stressSelecting the low power mode if the maximum axial stress is less than that corresponding to the low power mode, and selecting the low power mode if the maximum axial stress is less than that corresponding to the low power modeThe maximum axial stress corresponding to the high-power mode is less than the maximum axial stress corresponding to the low-power mode, the high-power mode is selected, and if the maximum axial stress is greater than the maximum axial stress corresponding to the low-power mode, the high-power mode is selectedIf the axial stress is larger than the maximum axial stress corresponding to the high-power mode, the pressing requirement cannot be met, the high-power powder incremental pressing device needs to be replaced, and according to the established incremental pressing model relationship, the axial stress is measured by using the axial stress of l-n delta l,Wherein l is the length of the pressed blank; Δ l is the length of the new pressurized embryo; n is the number of times of newly increased embryo pressing; i is the pressing frequency of the newly added pressed compact, i is 2,3, a.n;for the ith press, at a distance x from the press punchThe axial stress of local densification of the powder, the subscript a is axial initial and is axial identification, the subscript avg is average identification, x is the distance between a certain point in a pressed blank and a pressing punch, e is the base number of a natural logarithmic function in an exponential function and is about 2.71828, mu is a friction coefficient at a mold wall, ξ is a side pressure coefficient at the mold wall, r is a blank pressing radius, the length delta l of the newly added pressed blank and the number n of the newly added pressed blank are obtained through calculation, the number n of the newly added pressed blank is divided by the number n of the newly added pressed blank according to the total number of the pressed blank, a powder incremental pressing device starts to operate after the number n of the newly added pressed blank is set to a control chip 19, a stripper plate hydraulic rod 8 pushes a newly added stripper plate 7 into a lower die punch 6 to seal a stripping opening, a conveyor belt 9 sends the newly added blank powder 13 into a specified position, a push plate 10 pushes the newly added blank powder 13 into the female die and returns, a female die hydraulic rod 5 drags a front female die 3 to press the newly added blank 4, an upper die punch 2 and pushes the upper die punch rod 1 to push the blank 13 to push the blank 6 to push the blank 13 to push the blank to push the punch 2 to push the blank.
Theoretical analysis of incremental compaction over one compaction:
1. mathematical model building
Since the friction at the die wall inhibits the compaction of the powder, the axial stress for local densification of the powder decreases with increasing distance from the surface of the press punch, the following relationship exists:
and, the blank pressing density is positively correlated with the axial stress, namely:
ρavg(x)∈σa(x)
wherein σa(x) The method comprises the following steps Axial stress at distance x from the compaction punch for local densification of the powder;
average compaction density at a position x away from the compaction punch;
μ: the coefficient of friction at the mold wall, the same as below;
ξ lateral pressure coefficient at the mold wall, the same as below;
r: the blank pressing radius is the same as below.
2. One-time pressing
According to the above, the powder is pressed once, as shown in FIG. 1, for axial stressThe following relationship exists with the distance x:
and,
wherein,axial stress at a distance x from the compaction punch for local densification of the powder at the time of primary compaction;
l: and (5) pressing the embryo length.
3. Incremental compaction
Similarly, when incrementally pressed, as shown in FIG. 2, for axial stressesThe following relationship exists with the distance x:
l＝nΔl
and,
wherein,axial stress at distance x from the compaction punch for local densification of the powder at the ith compaction;
n: adding embryo pressing times;
Δ l: increasing the length of the embryo;
l: and (5) pressing the embryo length.
4. Comparative analysis
According to the pressing manner, there is the following relationship:
therefore, the temperature of the molten metal is controlled,
5. conclusion
In conclusion, the performance of the incremental pressing mode is superior to that of the one-time pressing mode in the two aspects of the density of the bottom end and the average density.
It should be noted that:
(1) the above model is built under ideal conditions so that the axial stress for local densification of the powder is not present at each compactionLosses occur due to the presence of lateral pressure, i.e.However, in practice, axial pressure losses still occurAnd increases with increasing x, and therefore, pre-sintering is performed after each pressing completion as necessary, so that the tendency of relative sliding between powder particles in the vicinity of the die wall is reduced, thereby reducing the axial pressure loss.
(2) And when powder is pressed every time, the powder and the pressing blank are formed by combining the interfaces between the powder and the pressing blank, so that a proper amount of binding agent can be added at the corresponding interface, the friction among particles is reduced, the engagement degree among the particles is increased, the axial pressure loss is further reduced, and the pressing process is ensured to be carried out.
(3) Through the establishment of the model, the manufacturing process related to incremental pressing can be optimized, namely the required parameters such as the density and the average density of the bottom end of the sample, the material characteristics and the size of the sample and the like are combined, the optimal pressing times and pressing power are obtained, and meanwhile, the optimal power mode is selected.
The invention has the beneficial effects that:
this device can realize that the powder increases progressively the suppression, sets up automatic control circuit moreover and realizes electric and automated control, improves production efficiency, reduction in production cost, reduces manpower working strength to and improve the safety in utilization, in addition, through providing high power mode and low power mode, reduce the energy consumption, raise the efficiency.
Drawings
FIG. 1 is a schematic diagram of the stress on a single-press powder compact and its coordinate system;
FIG. 2 is a schematic view of the stress on an incrementally pressed powder compact and its coordinate system;
FIG. 3 is a schematic view of a powder incremental compaction apparatus according to the present invention;
FIG. 4 is a schematic bottom view of the powder incremental compaction apparatus of the present invention;
FIG. 5 is a schematic electrical circuit diagram of the powder incremental compaction apparatus of the present invention;
FIG. 6 is a diagram showing the simulation result of the process running program according to the present invention;
FIG. 7 is a diagram illustrating simulation results of a mode-switching program according to the present invention;
in the figure, 1-upper punch, 2-upper punch hydraulic rod, 3-front female die, 4-rear female die, 5-female die hydraulic rod, 6-lower punch, 7-stripper plate, 8-stripper plate hydraulic rod, 9-conveyor belt, 10-push plate, 11-push plate connecting rod, 12-guide rail, 13-new blank pressing powder, 14-conveyor belt servo motor, 15-push plate connecting rod servo motor, 16-female die hydraulic rod servo motor, 17-upper punch hydraulic rod servo motor, 18-stripper plate hydraulic rod servo motor, 19-control chip, 20-reset circuit, 21-progress switch key circuit, 22-mode switching key circuit, 23-conveyor belt unidirectional rotation servo motor circuit, 24-push plate connecting rod unidirectional rotation servo motor circuit, 25-a female die hydraulic rod bidirectional rotation servo motor circuit, 26-an upper die stamping hydraulic rod bidirectional rotation servo motor circuit, 27-a stripper plate hydraulic rod bidirectional rotation servo motor circuit, 28-a triode switch circuit, 29-an output signal of a pin P1.3, 30-an output signal of a pin P1.4, 31-an output signal of a pin P2.0, 32-an output signal of a pin P2.1, 33-an output signal of a pin P2.2, 34-an output signal of a pin P2.3, 35-an output signal of a pin P2.4, 36-an output signal of a pin P2.5, 37-an output signal of a pin P2.6, 38-an output signal of a pin P2.7, 39-a stripper plate hydraulic rod 8 pushing a stripper plate into a lower die stamping 6, 40-a first new blank pressing process, 41-a second new blank pressing process, 42-a third new blank pressing process, 43-a process that the stripper plate is dragged out of the lower punch 6 by the stripper plate hydraulic rod 8, 44-an output signal of the pin P1.5, 45-a key trigger corresponding to the pin P1.1, 46-a key trigger corresponding to the pin P1.0, 47-a key trigger corresponding to the pin P1.1, and 48-a key trigger corresponding to the pin P1.0.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Example 1
A powder incremental pressing device is shown in figures 3, 4 and 5 and comprises an upper punch 1, an upper punch hydraulic rod 2, a front female die 3, a rear female die 4, a female die hydraulic rod 5, a lower punch 6, a stripper plate 7, a stripper plate hydraulic rod 8, a conveyor belt 9, a push plate 10, a push plate connecting rod 11, a guide rail 12, a conveyor belt servo motor 14, a push plate connecting rod servo motor 15, a female die hydraulic rod servo motor 16, an upper punch hydraulic rod servo motor 17, a stripper plate hydraulic rod servo motor 18 and an automatic control circuit, wherein the upper punch 1 and the upper punch hydraulic rod 2 are positioned right above the front female die 3 and the rear female die 4, the upper punch 1 is connected with the four upper punch hydraulic rods 2 in a matching manner to realize the movement along the axial direction of the upper punch 1, the axial line of the upper punch 1 is coincided with the central axis of the closed front female die 3 and the rear female die 4, the lower punch 6 is arranged below the front female die 3 and the rear female die, the lower punch 6 is provided with a stripping opening, the stripping opening is provided with a stripping plate 7, four female die hydraulic rods 5 are arranged between a front female die 3 and a rear female die 4, the four female die hydraulic rods 5 are arranged in pairwise symmetry, the rear female die 4 and the lower punch 6 are fixed, the front female die 3 moves in the horizontal plane direction of the front female die 3 through the four female die hydraulic rods 5 matched with the front female die 3, namely, the front female die 3 and the rear female die 4 are opened and closed, the stripping plate 7 is connected with the stripping plate hydraulic rods 8, the stripping plate 7 is moved by the stripping plate hydraulic rods 8 to realize opening and closing from the stripping opening, a conveying belt 9 is arranged beside the rear female die 4, the conveying belt 9 is matched with a pushing plate 10, the pushing plate 10 is intersected with the upper surface of the tail end of the conveying belt 9 in the moving process, the conveying belt 9 and the rear female die 4 are provided with guide rails 12, the pushing plate 10 is connected with a pushing plate connecting, the reciprocating type push plate connecting rod comprises a rotor and two connecting rods, wherein the connecting rod connected with the rotor is shorter, the connecting rod connected with the push plate 10 is longer, the longer connecting rod, the push plate 10 and the shorter connecting rod are fixedly connected with each other through a rotating shaft and realize relative rotation, the shorter connecting rod is fixedly connected with the rotor through a rivet and cannot rotate relatively, the rotor is connected with a push plate servo motor 15 through a transmission mechanism, a connecting line between the center of the rotor and the center of the push plate 10 is superposed with the central axis of a push plate groove, the push plate groove is an area where the push plate 10 retracts after pushing a pressed blank, the push plate connecting rod 11 is arranged on the side surface of a rear female die 4 and is fixedly connected with the rear female die 4, a conveyor belt 9 is driven by a conveyor belt servo motor 14, the push plate connecting rod 11 is driven by the push plate connecting rod servo motor 15, four upper die hydraulic ram rods 2 are simultaneously driven by an upper die, a stripper plate hydraulic rod 8 is driven by a stripper plate hydraulic rod servo motor 18;
the automatic control circuit is shown in fig. 5 and comprises a control chip 19, a reset circuit 20, a progress switch key circuit 21, a mode switching key circuit 22, a conveyor belt unidirectional rotation servo motor circuit 23, a push plate connecting rod unidirectional rotation servo motor circuit 24, a female die hydraulic rod bidirectional rotation servo motor circuit 25, an upper die punching hydraulic rod bidirectional rotation servo motor circuit 26, a stripper plate hydraulic rod bidirectional rotation servo motor circuit 27 and a triode switch circuit 28; the reset circuit 20, the progress switch key circuit 21, the mode switching key circuit 22, the conveyor belt unidirectional rotation servo motor circuit 23, the push plate connecting rod unidirectional rotation servo motor circuit 24, the female die hydraulic rod bidirectional rotation servo motor circuit 25, the upper die hydraulic rod bidirectional rotation servo motor circuit 26, the stripper plate hydraulic rod bidirectional rotation servo motor circuit 27 and the triode switch circuit 28 are respectively connected with the control chip 19;
the model version of the control chip 19 is AT89C52, and if other model versions are applied, the model version is not lower than AT89C 52;
the reset circuit 20 comprises a pull-down resistor, a capacitor, a ground terminal pin GND and an Output terminal pin Output, wherein the Output terminal pin Output is connected in series with the capacitor, the ground terminal pin GND is connected in series with the pull-down resistor, a series body of the Output terminal pin Output and the capacitor and a series body of the ground terminal pin GND and the pull-down resistor are connected in parallel, and the whole reset circuit 20 is connected with the RST pin of the control chip 19;
the process switch key circuit 21 and the mode switching key circuit 22 respectively comprise a key, a pull-down resistor, a ground terminal pin GND and an Input terminal pin Input, the key is connected with the ground terminal pin GND in series, the pull-down resistor is connected with the Input terminal pin Input in series, a series body of the key and the ground terminal pin GND and a series body of the pull-down resistor and the Input terminal pin Input are connected in parallel, the process switch key circuit 21 is connected with a pin P1.2 of the control chip 19, and the mode switching key circuit 22 is connected with pins P1.0 and P1.1 of the control chip 19;
the conveyor belt unidirectional rotation servo motor circuit 23 and the push plate connecting rod unidirectional rotation servo motor circuit 24 respectively comprise a motor, two diodes, an NPN type triode, a PNP type triode, two resistors, a ground terminal pin GND and an Input terminal pin Input, one end of the motor is connected with one diode, one NPN type triode and one resistor, the other end of the motor is connected with one diode, one PNP type triode and one resistor, a collector of the NPN type triode is connected with the Input terminal pin Input, an emitter of the NPN type triode is connected with the resistor, bases of the NPN type triode are respectively connected with the P2.0 pin and the P2.2 pin of the control chip 19, a collector of the PNP type triode is connected with the ground terminal pin GND, an emitter of the PNP type triode is connected with the resistor, bases of the PNP type triode are respectively connected with the P2.1 pin and the P2.3 pin of the control chip 19, the NP, the PNP type triode is connected with the other resistor in series, a series body of the PNP type triode and the other resistor is connected with a diode in parallel, the conveying belt unidirectional rotation servo motor circuit 23 is integrally connected with pins P2.0 and P2.1 of the control chip 19, and the push plate connecting rod unidirectional rotation servo motor circuit 24 is integrally connected with pins P2.2 and P2.3 of the control chip 19;
the female die hydraulic rod bidirectional rotation servo motor circuit 25, the upper die hydraulic rod bidirectional rotation servo motor circuit 26 and the stripper plate hydraulic rod bidirectional rotation servo motor circuit 27 respectively comprise a motor, four diodes, two NPN type triodes, two PNP type triodes, four resistors, a ground terminal pin GND and an Input terminal pin Input, one end of the motor is connected with a hybrid body formed by the two diodes, the NPN type triode, the PNP type triode and the two resistors, the other end of the motor is connected with a hybrid body formed by the two diodes, the NPN type triode, the PNP type triode and the two resistors, the base electrodes of the NPN type triode and the PNP type triode are respectively connected with the P2.4 pin, the P2.6 pin and the P1.3 pin of the control chip 19, the base electrodes of the other NPN type triode and the PNP type triode are respectively connected with the P2.5 pin, the P2.6 pin and the PNP type triode of the control chip, The pin P1.4 is connected, the female die hydraulic rod bidirectional rotation servo motor circuit 25 is integrally connected with the pins P2.4 and P2.5 of the control chip 19, the upper die hydraulic rod bidirectional rotation servo motor circuit 26 is integrally connected with the pins P2.6 and P2.7 of the control chip 19, and the stripper plate hydraulic rod bidirectional rotation servo motor circuit 27 is integrally connected with the pins P1.3 and P1.4 of the control chip 19;
the triode switch circuit 28 comprises an NPN type triode, a capacitor, two resistors, and an Input terminal pin Input, and the triode switch circuit 28 is integrally connected with a P1.5 pin of the control chip 19.
In addition, a conveyor belt unidirectional rotation servo motor circuit 23 is connected with a conveyor belt servo motor 14, a push plate connecting rod unidirectional rotation servo motor circuit 24 is connected with a push plate connecting rod servo motor 15, a female die hydraulic rod bidirectional rotation servo motor circuit 25 is connected with a female die hydraulic rod servo motor 16, an upper die punching hydraulic rod bidirectional rotation servo motor circuit 26 is connected with an upper die punching hydraulic rod servo motor 17, a stripper plate hydraulic rod bidirectional rotation servo motor circuit 27 is connected with a stripper plate hydraulic rod servo motor 18, and a triode switch circuit 28 is respectively connected with the female die hydraulic rod servo motor 16 and the upper die punching hydraulic rod servo motor 17.
The specific functions of each part of the circuit are as follows:
(1) the control chip 19 controls the output of related commands and signals;
(2) reset circuit 20 causes the circuit to revert to the initial state:
the reset circuit 20 is connected to the RST pin of the control chip 19.
(3) The process switch key circuit 21 controls whether the apparatus starts operating:
the process switch key circuit 21 is connected with a pin P1.2 of the control chip 19;
<2> the progress switch key circuit 21 is constituted by a sub switch network.
(4) The mode switch key circuit 22 controls switching between the high power mode and the low power mode:
the mode switching key circuit 22 is respectively connected with pins P1.0 and P1.1 of the control chip 19;
<2> the mode switching key circuit 22 is constituted by two pairs of switch networks.
(5) The conveyor belt unidirectional rotation servo motor circuit 23 controls the working condition of the conveyor belt servo motor 14:
the conveyor belt unidirectional rotation servo motor circuit 23 is connected with pins P2.0 and P2.1 of the control chip 19;
and <2> the conveyor belt servo motor 14 controls the conveyor belt 9 to convey the newly added pressed embryo to a specified position.
(6) The push plate connecting rod unidirectional rotation servo motor circuit 24 controls the working condition of the push plate connecting rod servo motor 15:
the push plate connecting rod unidirectional rotation servo motor circuit 24 is connected with pins P2.2 and P2.3 of the control chip 19;
and 2, controlling a push plate connecting rod servo motor 15 to drive a push plate 10 to push the newly added blank pressing powder 13 into the female die by a push plate connecting rod 11 and returning.
(7) The female die hydraulic rod bidirectional rotation servo motor circuit 25 controls the working condition of the female die hydraulic rod servo motor 16:
a female die hydraulic rod bidirectional rotation servo motor circuit 25 is connected with pins P2.4 and P2.5 of a control chip 19;
if the female die hydraulic rod servo motor 16 rotates in the forward direction, namely the high-level time of the PWM signal output by the pin P2.4 is longer than that of the PWM signal output by the pin P2.5, the female die hydraulic rod 5 is controlled to drive the front female die 3 to be tightly pressed with the rear female die 4;
if the female die hydraulic rod servo motor 16 rotates reversely, that is, the high level time of the PWM signal output by the pin P2.4 is shorter than the high level time of the PWM signal output by the pin P2.5, the female die hydraulic rod 5 is controlled to push the front female die 3 to separate from the rear female die 4.
(8) The upper die hydraulic ram bidirectional rotation servo motor circuit 26 controls the working condition of the upper die hydraulic ram servo motor 17:
the upper die hydraulic punching press rod bidirectional rotation servo motor circuit 26 is connected with pins P2.6 and P2.7 of the control chip 19;
if the servo motor 17 of the upper die stamping hydraulic rod rotates forwards, namely the high level time of the PWM signal output by the pin P2.6 is longer than that of the PWM signal output by the pin P2.7, the upper die stamping hydraulic rod 2 is controlled to drag the upper die stamping 1 to enter the female die so as to tightly press the female die with the newly added blank pressing powder 13;
if the servo motor 17 of the upper die stamping hydraulic rod rotates reversely, namely the high-level time of the PWM signal output by the pin P2.6 is less than the high-level time of the PWM signal output by the pin P2.7, the upper die stamping hydraulic rod 2 is controlled to push the upper die stamping 1 to leave the female die so as to separate the upper die stamping from the female die.
(9) The stripper plate hydraulic rod two-way rotation servomotor circuit 27 controls the operating conditions of the stripper plate hydraulic rod servomotor 18:
the stripper plate hydraulic rod bidirectional rotation servo motor circuit 27 is connected with pins P1.3 and P1.4 of the control chip 19;
if the servo motor 18 of the stripper plate hydraulic rod rotates in the forward direction, namely the high-level time of the PWM signal output by the pin P1.3 is longer than that of the PWM signal output by the pin P1.4, the stripper plate hydraulic rod 8 is controlled to push the stripper plate 7 to enter the lower punch 6 to close the stripping opening;
and if the servo motor 18 of the stripper plate hydraulic rod rotates reversely, namely the high-level time of the PWM signal output by the pin P1.3 is shorter than that of the PWM signal output by the pin P1.4, the stripper plate hydraulic rod 8 is controlled to drag the stripper plate 7 to leave the lower punch 6 to open the stripping opening.
(10) The triode switch circuit 28 controls the power output modes of the female die hydraulic rod servo motor 16 and the upper die hydraulic rod servo motor 17:
the triode switch circuit 28 is connected with a P1.5 pin of the control chip 19;
if the strength of a pressed sample is high, namely a high-power mode is used, the female die hydraulic rod servo motor 16 and the upper die hydraulic punching rod servo motor 17 output enhanced power to ensure the quality of the sample;
if the strength of the pressed sample is low, namely a low-power mode is used, the female die hydraulic rod servo motor 16 and the upper die hydraulic rod servo motor 17 output standard power, so that the energy consumption is reduced and the environmental evaluation standard is improved on the premise of ensuring the sample quality.
The method for progressively pressing powder includes such steps as providing female mould made of copper material and pressed blank made of aluminium, using friction coefficient table to inquire the friction coefficient mu of mould wall, and using elastic modulus (E) -Poisson's ratio (v) table and formulaCalculating lateral pressure coefficient ξ at the wall of the mold, measuring to obtain required blank pressing radius r and required blank pressing length l, and converting to obtain the maximum axial stress for local densification of powder according to the requirements of the required blank pressing on maximum density, minimum density and average density by using a Huangpeyun pressing formulaLowest axial stressMean axial stressDividing the maximum pressing pressure corresponding to the high power mode and the low power mode of the powder progressive pressing device by the sectional area of the pressing blank of 2 pi r2Converting to obtain the maximum axial stress for local densification of the powder corresponding to the high-power mode and the low-power mode of the device; compared with the once pressing method, the incremental pressing method has the advantages of both the density of the bottom end and the average density, the consideration of reducing the energy consumption on the premise of ensuring the quality of the pressed blank and the consideration of adding related codes in the process running program to ensure the realization of corresponding functional requirements due to the change of the number n of times of newly added pressed blanks is reduced as much as possible, when the high-power mode and the low-power mode can realize corresponding requirements through the incremental pressing method, the priority is given to realizing the pressing process through the incremental pressing method in the low-power mode, and the maximum axial stress for local powder densification corresponding to the high-power mode and the low-power mode of the device obtained through conversion and the maximum axial stress obtained through conversion by the Huangpeyun pressing formula are comparedComparison is made if the highest axial stressLess than maximum axis for low power modeSelecting low power mode if the axial stress is highestThe maximum axial stress corresponding to the high-power mode is less than the maximum axial stress corresponding to the low-power mode, the high-power mode is selected, and if the maximum axial stress is greater than the maximum axial stress corresponding to the low-power mode, the high-power mode is selectedIf the axial stress is larger than the maximum axial stress corresponding to the high-power mode, the pressing requirement cannot be met, and a device with larger power needs to be adjusted or replaced; according to the established incremental pressing model relation, l ═ n delta l,Calculating to obtain the newly added embryo pressing length delta l and the newly added embryo pressing times n, and dividing the pressed embryo pressing quality by the pressing times to obtain the once increased powder quality; and after the number n of the newly added blank pressing times is set to the control chip 19, the powder incremental pressing device starts to operate, and the method specifically comprises the following steps:
(1) the control chip 19 controls the stripper plate hydraulic rod to rotate bidirectionally and the servo motor circuit 27 operates, and the stripper plate hydraulic rod servo motor 18 drives the stripper plate hydraulic rod 8 to push the stripper plate 7 into the lower punch 6 to seal the stripping opening;
(2) the control chip 19 controls the conveyor belt one-way rotation servo motor circuit 23 to operate, the conveyor belt servo motor 14 controls the conveyor belt 9 to operate, and the conveyor belt 9 sends the newly added embryo pressing powder 13 to a specified position, namely the tail end of the conveyor belt 9;
(3) the control chip 19 controls the push plate connecting rod to rotate the servo motor circuit 24 in one way, the push plate connecting rod servo motor 15 controls the push plate connecting rod 11 to drive the push plate 10 to push the newly added blank pressing powder 13 at the tail end of the conveyor belt 9 into the female die and return;
(4) the control chip 19 controls the female die hydraulic rod to rotate the servo motor circuit 25 in two directions to operate, and the female die hydraulic rod servo motor 16 controls the female die hydraulic rod 5 to drag the front female die 3 to tightly press the rear female die 4;
(5) the control chip 19 controls the upper die hydraulic punching rod bidirectional rotation servo motor circuit 26 to operate, and the upper die hydraulic punching rod servo motor 17 controls the upper die hydraulic punching rod 2 to drag the upper die 1 to enter the female die so as to tightly press the upper die 1 with the newly added blank pressing powder 13;
(6) the pressing process is started, namely the upper punch 1 presses the newly added blank pressing powder 13 until the pressing process is finished;
(7) the control chip 19 controls the female die hydraulic rod bidirectional rotation servo motor circuit 25 to operate, the female die hydraulic rod servo motor 16 controls the female die hydraulic rod 5 to push the front female die 3 to be separated from the rear female die 4, the control chip 19 controls the upper die hydraulic rod bidirectional rotation servo motor circuit 26 to operate, and the upper die hydraulic rod servo motor 17 controls the upper die hydraulic rod 2 to push the upper die 1 to be separated from the female die;
(8) repeating the steps (2) to (7) and filling a new pressurizing blank again until the pressing is finished;
(9) after pressing, the control chip 19 controls the stripper plate hydraulic rod to rotate the servo motor circuit 27 in two directions, and the stripper plate hydraulic rod servo motor 18 controls the stripper plate hydraulic rod 8 to pull the stripper plate 7 out of the lower punch 6, press the blank and demold.
It should be noted that:
(1) powder incremental compaction processes are commonly used to form larger size parts, thus side stripping is used to ensure smooth stripping;
(2) when the powder is pressed in an increasing mode, the ratio of the once-increased length of the pressing blank to the equivalent diameter of the section is moderate, the ratio of the length to the diameter of the section is 1: 3-4: 1 usually, so that the filling process is smooth, and if the ratio is too small, the newly-added pressing blank is easy to topple in the filling process; if the ratio is too large, the tendency for relative sliding between powder particles near the die wall increases, affecting the compaction process.
The process runs the program requirement: the PWM signal output is realized through T0/T1 of a control chip 19(12 MHz); the pin P1.2 controls whether the process running program starts to run or not through the process switch key circuit 21 key, and the following steps are sequentially carried out:
(1) a pin P1.3 outputs a PWM signal, a high level is 8ms, a low level is 2ms, a pin P1.4 outputs a reverse PWM signal of the pin P1.3, and the duration of the above processes is 10s, so that the stripper plate hydraulic rod servo motor 18 rotates forward, and the function that the stripper plate hydraulic rod 8 separates the stripper plate 7 from the lower punch 6 is realized, that is, as shown in fig. 6 by an output signal 29 of the pin P1.3 and an output signal 30 of the pin P1.4;
(2) a pin P2.0 outputs a PWM signal, a high level is 8ms, a low level is 2ms, a pin P2.1 outputs a reverse PWM signal of the pin P2.0, and the duration of the above processes is 10s, so that the conveyor belt servo motor 14 rotates to realize the function of conveying the newly added embryo pressing powder 13 to a specified position by the conveyor belt 9, namely as shown by an output signal 31 of the pin P2.0 and an output signal 32 of the pin P2.1 in FIG. 6;
(3) a pin P2.2 outputs a PWM signal, a high level is 8ms, a low level is 2ms, and a pin P2.3 outputs a reverse PWM signal of the pin P2.2, and the duration of the above processes is 10s, so that the push plate connecting rod servo motor 15 rotates to realize the function that the push plate connecting rod 11 drives the push plate 10 to send the newly added green pressing powder 13 into the separated front female die 3 and rear female die 4 and return, that is, as shown in fig. 6, an output signal 33 of the pin P2.2 and an output signal 34 of the pin P2.3;
(4) a pin P2.4 outputs a PWM signal, a high level is 8ms, a low level is 2ms, a pin P2.5 outputs a reverse PWM signal of the pin P2.4, and the duration of the above processes is 20s, so that the female die hydraulic rod servo motor 16 rotates forward, and a function that the female die hydraulic rod 5 drags the front female die 3 and the rear female die 4 to compress tightly is realized, that is, as shown by an output signal 35 of the pin P2.4 and an output signal 36 of the pin P2.5 in fig. 6;
(5) a pin P2.6 outputs a PWM signal, a high level is 8ms, a low level is 2ms, and a pin P2.7 outputs a reverse PWM signal of the pin P2.6, and the duration of the above processes is 20s, so that the servo motor 17 of the upper die stamping hydraulic rod rotates forward, and the function of the upper die stamping hydraulic rod 2 dragging the upper die stamping 1 to press the newly added green compact powder 13 is realized, that is, as shown in fig. 6 by an output signal 37 of the pin P2.6 and an output signal 38 of the pin P2.7;
(6) a pin P2.4 outputs a PWM signal, a low level is 8ms, a high level is 2ms, a pin P2.5 outputs a reverse PWM signal of the pin P2.4, and the duration of the above processes is 20s, so that the female die hydraulic rod servo motor 16 rotates in reverse direction, and a function that the female die hydraulic rod 5 pushes the front female die 3 to separate from the rear female die 4 is realized, that is, as shown in fig. 6, an output signal 35 of the pin P2.4 and an output signal 36 of the pin P2.5 are shown;
(7) a pin P2.6 outputs a PWM signal, a low level is 8ms, a high level is 2ms, and a pin P2.7 outputs a reverse PWM signal of the pin P2.6, and the duration of the above processes is 20s, so that the upper die hydraulic ram servo motor 17 rotates in reverse direction, and the function of the upper die hydraulic ram 2 pushing the upper die 1 to leave the separated front female die 3 and the separated rear female die 4 is realized, that is, as shown by an output signal 37 of the pin P2.6 and an output signal 38 of the pin P2.7 in fig. 6;
(8) pin P1.3 outputs a PWM signal, low level 8ms, high level 2ms, pin P1.4 outputs a reverse PWM signal of pin P1.3, and the above process; the duration time is 10s, so that the servo motor 18 of the stripper plate hydraulic rod rotates reversely, and the function that the stripper plate hydraulic rod 8 pushes the stripper plate 7 into the lower punch 6 is realized, namely as shown by an output signal 29 of a pin P1.3 and an output signal 30 of a pin P1.4 in fig. 6;
(9) first, the process (1) is performed, i.e., the stripper plate is pushed into the lower punch 6 by the stripper plate hydraulic rod 8 in fig. 6, then the processes (2) - (7) are performed and circulated (3 times in this embodiment, the duration of the signal output is totally 320s) times, i.e., the first new blank pressing process 40, the second new blank pressing process 41, and the third new blank pressing process 42 in fig. 6, and finally the process (8) is performed, i.e., the stripper plate is pulled out of the lower punch 6 by the stripper plate hydraulic rod 8 in fig. 6, 43.
The data setting is an example of a process running program, the other data uses the program framework similarly, and it should be noted that the initial setting of the device is as follows:
(1) pins P1.3, P1.4, P1.5, P2.0, P2.1, P2.2, P2.3, P2.4, P2.5, P2.6, and P2.7 of the control chip 19 all output low level signals initially;
(2) the stripper plate 7 is initially positioned in the opening of the lower punch 6 by the stripper hydraulic ram 8;
(3) the push plate link 11 causes the push plate 10 to be initially located at the return stroke top end position;
(4) the upper punch hydraulic rod 2 causes the upper punch 1 to be initially positioned directly above the separated front female die 3 and rear female die 4;
(5) the female die hydraulic ram 5 causes the front female die 3 to be initially located at a position separated from the rear female die 4;
(6) pin P1.3 outputs PWM signals of high level 8ms and low level 2ms, pin P1.4 outputs reverse PWM signal of pin P1.3, so that the stripper plate hydraulic rod servo motor 18 rotates forward, pin P1.3 outputs PWM signal of low level 8ms and high level 2ms, pin P1.4 outputs reverse PWM signal of pin P1.3, so that the stripper plate hydraulic rod servo motor 18 rotates reversely;
(7) pin P2.4 outputs PWM signals of high level 8ms and low level 2ms, pin P2.5 outputs PWM signals of reverse direction of pin P2.4, so that the female die hydraulic rod servo motor 16 rotates in forward direction, pin P2.4 outputs PWM signals of low level 8ms and high level 2ms, and pin P2.5 outputs PWM signals of reverse direction of pin P2.4, so that the female die hydraulic rod servo motor 16 rotates in reverse direction;
(8) the pin P2.6 outputs PWM signals of high level 8ms and low level 2ms, the pin P2.7 outputs a reverse PWM signal of the pin P2.6, so that the upper die hydraulic ram servo motor 17 rotates in the forward direction, the pin P2.6 outputs PWM signals of low level 8ms and high level 2ms, and the pin P2.7 outputs a reverse PWM signal of the pin P2.6, so that the upper die hydraulic ram servo motor 17 rotates in the reverse direction.
The mode switching procedure requires: the PWM signal output is realized through T0/T1 of a control chip 19(12 MHz); if the key corresponding to the pin P1.0 is triggered, the pin P1.5 continuously outputs the high level until the key corresponding to the pin P1.1 is triggered, and the pin P1.5 continuously outputs the low level, and if the key corresponding to the pin P1.1 is triggered, the pin P1.5 continuously outputs the low level until the key corresponding to the pin P1.0 is triggered, and the pin P1.5 continuously outputs the high level, which are shown as an output signal 44 of the pin P1.5, a key trigger 45 corresponding to the pin P1.1, a key trigger 46 corresponding to the pin P1.0, a key trigger 47 corresponding to the pin P1.1, and a key trigger 48 corresponding to the pin P1.0 in fig. 7; the key corresponding to the pin P1.0 and the key corresponding to the pin P1.1 are not allowed to be triggered simultaneously.
(1) A key trigger corresponding to the pin P1.0, that is, as shown in fig. 7, a key trigger 46 corresponding to the pin P1.0 and a key trigger 48 corresponding to the pin P1.0, the pin P1.5 outputs a high level signal, a base of an NPN type triode in the triode switch circuit 28 is in a conducting state, and an enhanced current source inputs an extra current into the female die hydraulic rod bidirectional rotation servo motor circuit 25 and the upper die hydraulic rod bidirectional rotation servo motor circuit 26 through collector-emitter directions of the NPN type triode, drives the female die hydraulic rod servo motor 16 and the upper die hydraulic rod servo motor 17 to be in a high power mode, and outputs enhanced power for pressing a sample with higher strength, thereby ensuring the quality of the sample;
(2) as shown in fig. 7, the pin P1.1 outputs a low level signal, the base of the NPN type transistor in the transistor switching circuit 28 is in a non-conducting state, and the enhancement current source cannot input extra current into the female die hydraulic ram bidirectional rotation servo motor circuit 25 and the upper die hydraulic ram bidirectional rotation servo motor circuit 26 through the collector-emitter directions of the NPN type transistor, so that the female die hydraulic ram servo motor 16 and the upper die hydraulic ram servo motor 17 are in a low power mode and output standard power for pressing a sample with high strength, thereby reducing energy consumption and improving the standard of the loop evaluation on the premise of ensuring the quality of the sample.
Claims (5)
1. A powder progressive-increase pressing device is characterized by comprising an upper punch (1), an upper punch hydraulic rod (2), a front female die (3), a rear female die (4), a female die hydraulic rod (5), a lower punch (6), a stripper plate (7), a stripper plate hydraulic rod (8), a female die hydraulic rod servo motor (16), an upper punch hydraulic rod servo motor (17) and a stripper plate hydraulic rod servo motor (18), wherein the upper punch (1) and the upper punch hydraulic rod (2) are positioned above the front female die (3) and the rear female die (4), the upper punch (1) is connected with the four upper punch hydraulic rods (2), the axis of the upper punch (1) is superposed with the axis of the closed front female die (3) and rear female die (4), the lower punch (6) is arranged below the front female die (3) and the rear female die (4), a stripping die opening is formed in the lower punch (6), and the stripper plate (7) is arranged on the stripping die opening, four female die hydraulic rods (5) are arranged between the front female die (3) and the rear female die (4), the four female die hydraulic rods (5) are arranged in a pairwise symmetrical mode, the rear female die (4) and the lower die punch (6) are fixed, the front female die (3) and the four female die hydraulic rods (5) are matched to push the front female die (3) to move, and the stripper plate (7) is connected with the stripper plate hydraulic rod (8); the four upper die hydraulic punching rods (2) are simultaneously driven by an upper die hydraulic punching rod servo motor (17), the four female die hydraulic rods (5) are simultaneously driven by a female die hydraulic rod servo motor (16), and the stripper plate hydraulic rod (8) is driven by a stripper plate hydraulic rod servo motor (18).
2. The incremental powder pressing device according to claim 1, further comprising a conveyor belt (9), a push plate (10), a push plate connecting rod (11), a guide rail (12), a conveyor belt servo motor (14) and a push plate connecting rod servo motor (15), wherein the conveyor belt (9) is arranged beside the rear female die (4), the guide rail (12) is arranged on the conveyor belt (9) and the rear female die (4), the conveyor belt (9) and the push plate (10) are arranged in a matched mode, the push plate (10) intersects with the conveyor belt (9) in the moving process, the push plate (10) is connected with the push plate connecting rod (11), the push plate connecting rod (11) is arranged on the side face of the rear female die (4), the conveyor belt (9) is driven by the conveyor belt servo motor (14), and the push plate connecting rod (11) is driven by.
3. The incremental powder compaction device of claim 2 wherein the push plate link (11) is a reciprocating push plate link.
4. The incremental powder pressing device according to claim 3, further comprising an automatic control circuit, wherein the automatic control circuit comprises a control chip (19), a reset circuit (20), a progress switch key circuit (21), a mode switching key circuit (22), a conveyor belt unidirectional rotation servo motor circuit (23), a push plate connecting rod unidirectional rotation servo motor circuit (24), a female mold hydraulic rod bidirectional rotation servo motor circuit (25), an upper mold hydraulic rod bidirectional rotation servo motor circuit (26), a stripper plate hydraulic rod bidirectional rotation servo motor circuit (27) and a triode switch circuit (28); the control chip (19) is respectively connected with a reset circuit (20), a process switch key circuit (21), a mode switching key circuit (22), a conveyor belt unidirectional rotation servo motor circuit (23), a push plate connecting rod unidirectional rotation servo motor circuit (24), a female die hydraulic rod bidirectional rotation servo motor circuit (25), an upper die punching hydraulic rod bidirectional rotation servo motor circuit (26), a stripper plate hydraulic rod bidirectional rotation servo motor circuit (27) and a triode switch circuit (28); the process switch key circuit (21) is composed of a pair of switch networks, the mode switching key circuit (22) is composed of two pairs of switch networks, a conveyor belt unidirectional rotation servo motor circuit (23) is connected with a conveyor belt servo motor (14), a push plate connecting rod unidirectional rotation servo motor circuit (24) is connected with a push plate connecting rod servo motor (15), a female die hydraulic rod bidirectional rotation servo motor circuit (25) is connected with a female die hydraulic rod servo motor (16), an upper die hydraulic rod bidirectional rotation servo motor circuit (26) is connected with an upper die hydraulic rod servo motor (17), a stripper plate hydraulic rod bidirectional rotation servo motor circuit (27) is connected with a stripper plate hydraulic rod servo motor (18), the triode switch circuit (28) is respectively connected with the female die hydraulic rod bidirectional rotation servo motor circuit (25) and the upper die stamping hydraulic rod bidirectional rotation servo motor circuit (26).
5. A method for incrementally compacting powder, characterized in that l ═ n Δ l, and,Wherein l is the length of the pressed blank; Δ l is the length of the new pressurized embryo; n is the number of times of newly increased embryo pressing; i is the pressing frequency of the newly added pressed compact, i is 2,3, a.n;axial stress at x distance from the compaction punch for local densification of the powder at the ith compaction; subscript a is the initial of axial, and is an axial mark; subscript avg is an average value identification; x is the distance between a certain point in the compact and the pressing punchThe method comprises the steps of calculating the length delta l of a newly added pressed blank and the number n of newly added pressed blanks according to the base number of a natural logarithmic function in an exponential function, wherein the value of the base number is about 2.71828, the friction coefficient at the position of a mold wall is mu, the side pressure coefficient at the position of the mold wall is ξ, the radius of a pressed blank is r, the newly added pressed blank length delta l and the number n of newly added pressed blanks are obtained through calculation, the mass of powder which is increased once is obtained by dividing the total mass of the pressed blanks by the number n of newly added pressed blanks, the newly added pressed blank number n is set to a control chip (19), the powder incremental pressing device according to any one of claims 1-4 starts to operate, a stripper plate hydraulic rod (8) pushes a stripper plate (7) into a lower die punch (6) to seal a demolding opening, a conveyor belt (9) sends the newly added pressed blank powder (13) to a designated position, a push plate (10) into the female die and returns, a female die hydraulic rod (5) drags a front female die (3) to tightly press the rear female die (4), an upper die hydraulic rod (2) drags the newly added pressed blank (13) into the lower die (6) to tightly, the upper die (6), and drags the upper die (2) from the upper die (6) to push the stripper plate (6) to push the upper die hydraulic rod to separate the upper die (6) from the upper die (2) to push the stripper plate (6) to push the punch hydraulic rod to push the blank (6) again.
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| CN116890112B (en) * | 2023-09-08 | 2023-12-01 | 湖南三创切削工具有限公司 | Forming die and forming process for molding hard alloy bar by metal powder compression molding |
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| CN1480543A (en) * | 2002-04-17 | 2004-03-10 | �����ɷ� | Carbide alloy structural member with gradient structure |
| CN104645408A (en) * | 2015-03-09 | 2015-05-27 | 吉林大学 | Method for preparing gradient beta phase tricalcium phosphate bone substitute material |
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