CN105107933A - Electroplastic incremental forming device for plate and working method thereof - Google Patents
Electroplastic incremental forming device for plate and working method thereof Download PDFInfo
- Publication number
- CN105107933A CN105107933A CN201510408904.2A CN201510408904A CN105107933A CN 105107933 A CN105107933 A CN 105107933A CN 201510408904 A CN201510408904 A CN 201510408904A CN 105107933 A CN105107933 A CN 105107933A
- Authority
- CN
- China
- Prior art keywords
- plate
- main shaft
- pulse power
- progressive molding
- brush
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention discloses an electroplastic incremental forming device for a plate and a working method thereof, and belongs to the field of metal processing. The device comprises a machine tool and a pulse power supply, wherein a plate clamping device is fixed on a workbench of the machine tool; a clamping block, an electric brush holder and a retainer are arranged on a main shaft of the machine tool; the clamping block is connected with a tool head used for processing the plate; the electric brush holder is L-shaped, one end of the electric brush holder is fixed on the main shaft, and the other end of the electric brush holder is connected with an electric brush used for being abutted against the clamping block; the retainer is U-shaped, one end of the retainer is fixed on the main shaft, and the other end of the retainer stretches to a place below the plate and is connected with a lower press head used for being abutted against the lower surface of the plate; the tool head faces the lower press head; and the two poles of the pulse power supply are connected with the electric brush and the lower press head respectively. The electroplastic incremental forming device for the plate disclosed by the invention is simple in structure, easy to control, and low in processing cost; the forming accuracy of the plate is high; and the forming limit and the forming quality of the plate are increased and improved.
Description
Technical field
The present invention relates to metal processing sectors, refer to a kind of plate Electroplastic progressive molding device and method of work thereof especially.
Background technology
Electro plastic effect be material under the effect (comprising the electro photoluminescence such as electron irradiation, electric field, current impulse) of electricity, resistance of deformation reduce, plasticity increase a kind of phenomenon.Utilize electro plasticity effect, not only can reduce flow stress, improve the plasticity of material, improve the structure property of goods to a certain extent, heating and heat treated many deficiencies can be avoided simultaneously, reduce equipment cost.Electro plastic effect is the coefficient results of several physical such as joule heating effect, magnetic compression effect, kelvin effect and pure electro plasticity effect.The high density moving electron and the material internal atom that flow through flow of metal cross section collide, and add atom kinetic energy, thus increase material dislocation activation energy, promote dynamic recrystallization, suppress the generation of fracture hole, improve material plasticity deformability.
Plate Metal CNC Incremental Forming technology is a kind of Flexible Manufacturing Technology risen in the world soon, relate to the multi-disciplinary advanced intelligent manufacturing technologies such as mechanics, plastic forming technology, Numeric Control Technology, CAD/CAM, it is one of the study frontier in current plastic working field, processing Theory research also has great importance, obtains the concern of plastic working scholar in world wide.Plate progressive molding technology is that the luxuriant husband in Japanese scholars Songyuan City proposed in early 1990s, that a kind of computer numerical control based on " Layered manufacturing " thought is without mould process technology, by workpiece 3D shape discretization, highlight the buildup of increments forming technique of layer as machining cell.This technology eliminates the demand to particular mold, meet low cost Suresh Kumar fast rapid-result sample that is customized or new product and debug production requirement, easily be automated processing, compared with being shaped with traditional once drawing, the profiled member that curved surface is more complicated, percentage elongation is higher can be processed, machining accuracy and surface quality are all better, and development prospect is boundless.
Electro plastic effect combines with plate Metal CNC Incremental Forming technology by people gradually, form plate Electroplastic progressive molding device, as publication number be CN102527830A patent document discloses a kind of sheet material Electroplastic progressive molding device and manufacturing process thereof, in this device, plate is fixed on sheet forming fixture, the upper and lower of plate has upper contour squeeze and lower contour squeeze respectively, upper contour squeeze is arranged on the main shaft end of lathe, lower contour squeeze is arranged on six-joint robot system of processing top and establishes, one pole of power supply connects upper contour squeeze by upper contour squeeze fixed block, another pole connects lower contour squeeze, form loop.
But this device have employed two cover motions (main shaft and six-joint robot system of processing) and controls contour squeeze and lower contour squeeze respectively, complex structure, and restive, employ six-joint robot system of processing, processing cost is higher; Two cover motions easily produce error, contour squeeze and lower contour squeeze position is made to occur skew, can not be always just right, can not ensure that the sense of current is always consistent with sheet metal deformation direction, because electro plastic effect to apply pulse current during in sheet metal deformation direction, electro plasticity effect is the most remarkable, processing resistance is minimum, therefore the processing resistance of this device can not be able to ensure always minimum with error change, causes sheet forming precision low; The upper contour squeeze of this device is directly connected with wire by upper contour squeeze fixed block, can not carry out rotation, and laterally processing resistance is large for upper contour squeeze, and plate is easily torn and surface tear, reduces Sheet Metal Forming Limit and forming quality.
Summary of the invention
The invention provides a kind of plate Electroplastic progressive molding device and method of work thereof, this apparatus structure is simple, and be easy to control, processing cost is lower; Sheet forming precision is high; Improve Sheet Metal Forming Limit and forming quality.
For solving the problems of the technologies described above, the invention provides technical scheme as follows:
A kind of plate Electroplastic progressive molding device, comprises lathe and the pulse power, the workbench of described lathe is fixed with plate clamping device, the main shaft of described lathe is provided with grip block, brush carrier and retainer, wherein:
Described grip block is connected with the tool heads for processing described plate;
Described brush carrier is L-type, and upper end is fixed on described main shaft, and lower end is connected with for the brush against described grip block;
Described retainer is U-shaped, one end is fixed on described main shaft, the other end to reach below described plate and is connected with for the push-down head against described plate lower surface, and described tool heads and push-down head are just right, and the two poles of the earth of the described pulse power connect described brush and push-down head respectively.
Further, the transverse sleeves that described brush carrier comprises vertical supports and is connected with described vertical supports, the upper end of described vertical supports connects described main shaft, and described brush is arranged in described transverse sleeves, and the rear portion of the inherent described brush of described transverse sleeves is provided with the first preloading spring.
Further, the surface of described grip block is cylindrical, described brush is processed with the concave arc adapted with the surface of described grip block.
Further, the U-shaped guide pillar that described retainer comprises vertical guide pin bushing and is connected with described vertical guide pin bushing, the upper end of described vertical guide pin bushing is fixed on described main shaft, lower end has guide groove, one end of described U-shaped guide pillar reaches in described guide groove, the other end to reach below described plate and connects described push-down head, is provided with the second preloading spring in described guide groove.
Further, be provided with insulator cap between described main shaft and grip block, described main shaft is provided with insulation sleeve, described brush carrier and retainer are arranged on described insulation sleeve.
Further, the material of described insulator cap and insulation sleeve is polyether-ether-ketone.
Further, described plate clamping device comprises base plate and upper support frame, is provided with column between described base plate and upper support frame, wherein:
The alternate internal of described upper support frame is provided with longitudinal bracing block and cross-brace block;
Described upper support frame is also provided with the briquetting for fixing described plate;
Described upper support frame, longitudinal bracing block, cross-brace block and briquetting have bolt hole.
Further, described plate clamping device is fixed on described workbench by jig, is provided with felt pad between described base plate and workbench and between base plate and jig.
Further, described felt pad material is mica.
Further, described tool heads comprises forming head and nested handle, and described forming head material is YG15 Hardmetal materials, and described nested handle material is Cr12 die steel material.
The method of work of above-mentioned arbitrary plate Electroplastic progressive molding device, described magnesium alloy sheet is by lathe progressive molding, described magnesium alloy sheet is connected with the pulse power, the output voltage of the described pulse power is that narrow point impacts triangular pulse, it is 60-80 μ s that described narrow point impacts triangular pulse width, the output voltage of the described pulse power is more than or equal to 70V, the output frequency of the described pulse power is more than or equal to 200Hz, and the current density virtual value flowing through described magnesium alloy sheet is more than or equal to 95A/mm
2.
Further, the current density virtual value flowing through described plate is 95-115A/mm
2, the output voltage of the described pulse power is 70-90V, and frequency is 200-350Hz, and the density peak value flowing through described plate is 950-1100A/mm
2.
Further, the upper surface of described plate is coated with the molybdenum disulfide powder coating of lubricate, and the thickness of described molybdenum disulfide powder coating is 0.08-0.12mm; The preparation method of described molybdenum disulfide powder coating is: by molybdenum disulfide powder and acetone soln according to 1g:5ml mixing and stirring, form lubricant, by the upper surface of described lubricant uniform application at described plate, described plate is placed in more than 30 minutes, ventilation, acetone soln is evaporated dry, molybdenum disulfide powder coating can be obtained; The order number of described molybdenum disulfide powder is more than or equal to 800 orders, and described acetone soln purity is more than 95%.
The present invention has following beneficial effect:
Compared with prior art, in plate Electroplastic progressive molding device of the present invention, tool heads is by grip block connecting machine tool main shaft, and push-down head passes through retainer connecting machine tool main shaft, when machine tool chief axis moves, tool heads and push-down head synchronizing moving, employing single movement system (i.e. main shaft) like this gets final product control tool head and push-down head, and structure is simple, is easy to control, eliminate six-joint robot system of processing, processing cost is lower.
Tool heads and push-down head are just right, ensure that pulse current flows through plate at vertical direction, consistent with plate cutting deformation direction, and adopt single movement system control facilities head and push-down head, error can not be produced, make sheet metal deformation direction consistent with pulse current direction, electro plasticity effect significantly and can not change, makes sheet forming precision high.
The pulse power is contacted with grip block by brush, instead of wire directly connects grip block, therefore tool heads can add rotation in man-hour, and laterally processing resistance is little to make tool heads, and plate is not easy to tear and surface tear, improves Sheet Metal Forming Limit and forming quality.
Therefore plate Electroplastic progressive molding apparatus structure of the present invention is simple, be easy to control, processing cost is lower; Sheet forming precision is high; Improve Sheet Metal Forming Limit and forming quality.
Accompanying drawing explanation
Fig. 1 is plate Electroplastic progressive molding apparatus structure schematic diagram of the present invention;
Fig. 2 is the plate clamping device structural representation in the present invention;
Fig. 3 is the trend graph that the forming property of plate in the method for work of plate Electroplastic progressive molding device of the present invention changes with current density virtual value;
Fig. 4 is that the metallographic structure of plate in the method for work of plate Electroplastic progressive molding device of the present invention develops schematic diagram;
Fig. 5 is tool heads and plate contact area schematic diagram in the method for work of plate Electroplastic progressive molding device of the present invention;
Fig. 6 is the output voltage waveforms schematic diagram of the pulse power in the method for work of plate Electroplastic progressive molding device of the present invention.
Detailed description of the invention
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
On the one hand, the invention provides a kind of plate Electroplastic progressive molding device, as shown in Figure 1, comprise lathe 1 and the pulse power 2, the workbench 11 of lathe 1 is fixed with plate clamping device 3, the main shaft 12 of lathe 1 is provided with grip block 4, brush carrier 5 and retainer 6, wherein:
Grip block 4 is connected with the tool heads 8 (in Fig. 1,18 is handle of a knife, and grip block 4 is fixed on handle of a knife 18) for processing plate 7;
Brush carrier 5 is L-type, and upper end is fixed on main shaft 12, and lower end is connected with for the brush 51 against grip block 4;
Retainer 6 is U-shaped, and one end is fixed on main shaft 12, and the other end to reach below plate 7 and is connected with for the push-down head 9 against plate 7 lower surface, tool heads 8 and push-down head 9 just right, the two poles of the earth of the pulse power 2 connect brush 51 and push-down head 9 respectively.
In plate Electroplastic progressive molding device of the present invention, the pulse power, brush, tool heads, plate, push-down head form galvanic circle, electric current in this loop is pulse current, and electro plastic effect makes that the resistance of deformation of plate reduces, plasticity increases, thus progressive molding is carried out smoothly.
Above-mentioned lathe can be Digit Control Machine Tool, be preferably the vertical four-shaft numerically controlled lathe of band NC rotary table, the pulse power is preferably high energy pulse power supply, small voltage heavy current pulse (electro plastic effect needs to reach certain current density threshold) can be exported, most high impulse peak point current >=5000A, frequency 100-900Hz, voltage 30-140V continuously adjustabe.
The course of work of plate Electroplastic progressive molding device of the present invention is: utilize CAD software to carry out three-dimensional modeling to the workpiece for processing, then its CAM function is utilized threedimensional model to be carried out layering (section) process along machining path direction, produce trail file, finally machining locus source file processed and produce NC code; Plate is fixed on plate clamping device, then plate clamping device is fixed on the workbench of lathe; Select suitable tool heads, and tool heads is fixed to (what show in Fig. 1 is be fixed on handle of a knife 18) on main shaft by grip block; By the NC code reader bed of the workpiece for processing, adjust the original position of tool heads; Set voltage and the frequency of the pulse power; Start lathe, open the pulse power, start processing; After machining, close the pulse power, stop lathe.
Compared with prior art, in plate Electroplastic progressive molding device of the present invention, tool heads is by grip block connecting machine tool main shaft, and push-down head passes through retainer connecting machine tool main shaft, when machine tool chief axis moves, tool heads and push-down head synchronizing moving, employing single movement system (i.e. main shaft) like this gets final product control tool head and push-down head, and structure is simple, is easy to control, eliminate six-joint robot system of processing, processing cost is lower.
Tool heads and push-down head are just right, ensure that pulse current flows through plate at vertical direction, consistent with plate cutting deformation direction, and adopt single movement system control facilities head and push-down head, error can not be produced, make sheet metal deformation direction consistent with pulse current direction, electro plasticity effect significantly and can not change, makes sheet forming precision high.
The pulse power is contacted with grip block by brush, instead of wire directly connects grip block, therefore tool heads can add rotation in man-hour, and laterally processing resistance is little to make tool heads, and plate is not easy to tear and surface tear, improves Sheet Metal Forming Limit and forming quality.
Therefore plate Electroplastic progressive molding apparatus structure of the present invention is simple, be easy to control, processing cost is lower; Sheet forming precision is high; Improve Sheet Metal Forming Limit and forming quality.
As a modification of the present invention, as shown in Figure 1, the transverse sleeves 53 that brush carrier 5 comprises vertical supports 52 and is connected with vertical supports 52, the upper end of vertical supports 52 connects main shaft 12, brush 51 is arranged in transverse sleeves 53, and the rear portion of the inherent described brush of transverse sleeves 53 is provided with the first preloading spring 54.
First preloading spring is thrust spring, makes brush close contact grip block, ensures the unimpeded of galvanic circle.
Preferably, as shown in Figure 1, the surface of grip block 4 is cylindrical, brush 51 is processed with the concave arc adapted with the surface of grip block 4.
The surface of grip block is cylindrical, endoporus fixed clamp tool heads, and drive tool heads motion with machine tool chief axis, brush is processed with concave arc, both close contacts, realizes keeping energising in relative rotation simultaneously, ensures the unimpeded of galvanic circle further.
Improve as another kind of the present invention, as shown in Figure 1, the U-shaped guide pillar 62 that retainer 6 comprises vertical guide pin bushing 61 and is connected with vertical guide pin bushing 61, the upper end of vertical guide pin bushing 61 is fixed on main shaft 12, lower end has guide groove, one end of U-shaped guide pillar 62 reaches in guide groove, and the other end to reach below plate 7 and connects push-down head 9, is provided with the second preloading spring 63 in guide groove.
Second preloading spring is tension spring, makes the lower surface of push-down head close contact plate, ensures the unimpeded of galvanic circle.
Plate Electroplastic progressive molding device of the present invention also should have insulation measures, and as shown in Figure 1, specifically have, be provided with insulator cap 13 between main shaft 12 and grip block, main shaft 12 is provided with insulation sleeve 14, brush carrier 5 and retainer 6 are arranged on insulation sleeve 14.
Insulator cap is by main shaft (being handle of a knife in Fig. 1) and grip block insulation, and insulation sleeve is circular, is enclosed within main shaft, makes brush carrier, retainer and main shaft three mutually insulated.
Insulator cap and insulation sleeve can adopt various insulating materials to obtain, and the material of preferred insulative cap 13 and insulation sleeve 14 is polyether-ether-ketone (PEEK plastics).PEEK plastics are high temperature resistant, corrosion-resistant, wear-resisting, good mechanical property.
Plate clamping device 3 of the present invention comprises base plate 31 and upper support frame 32, is provided with column 33 between base plate 31 and upper support frame 32, as depicted in figs. 1 and 2, wherein:
The alternate internal of upper support frame 32 is provided with longitudinal bracing block 34 and cross-brace block 35, longitudinal bracing block and cross-brace block all at least one;
Upper support frame 32 is also provided with the briquetting 36 for fixing plate;
Upper support frame 32, longitudinal bracing block 34, cross-brace block 35 and briquetting 36 have bolt hole 37, fixes with bolt 38.
Plate gripping apparatus grips is firm, and multiple longitudinal bracing block and cross-brace block can meet the plate demand of different size.
When fixed head material clamping device, as shown in Figure 1, can plate clamping device 3 be fixed on workbench 11 by jig 16, between base plate 31 and workbench 11 and between base plate 32 and jig 16, be provided with felt pad 17.Platen and plate clamping device insulate by felt pad.
Felt pad can adopt various insulating materials to obtain, and preferred felt pad 17 material is mica.Mica insulation, proof voltage, thermal resistance.
Above-mentioned tool heads 8 comprises forming head 81 and nested handle 82, and as shown in Figure 1, forming head 81 material is YG15 Hardmetal materials, and nested handle 82 material is Cr12 die steel material.YG15 carbide alloy intensity and good toughness, anti-wear performance is excellent; Cr12 mould steel intensity is high, and wearability is good.
On the other hand, the invention provides a kind of method of work of above-mentioned arbitrary plate Electroplastic progressive molding device, should for magnesium alloy sheet, following plate is magnesium alloy sheet, this plate is by lathe progressive molding, and plate is connected with the pulse power, and the output voltage of the pulse power is that narrow point impacts triangular pulse, as shown in Figure 6, narrow point impacts triangular pulse width (t
i) be 60-80 μ s (preferably 70 μ s), the output voltage of the pulse power is more than or equal to 70V, and the output frequency of the pulse power is more than or equal to 200Hz, and the current density virtual value flowing through plate is more than or equal to 95A/mm
2.
Method of work comprises:
1, modeling programming: utilize CAD software to set up the three-dimensional digital model of target part, then the model adopting CAM software to be set up by CAD software is discrete along short transverse, produces the machining locus in each contour aspect;
2, lubricant is smeared at the upper surface of plate;
3, arrange lathe and Pulse Electric source condition, the output voltage of the adjustment pulse power is not less than 70V; Frequency is not less than as 200Hz, makes the current density virtual value flowing through plate be more than or equal to 95A/mm
2; The value of voltage and frequency must make current density virtual value be more than or equal to 95A/mm
2, as voltage get 70V time, frequency should be greater than 250Hz, and when voltage gets 90V or more, frequency only need be greater than 200Hz;
Current density virtual value is determined jointly by the contact area of the output voltage of the pulse power, frequency and tool heads and plate, output voltage and frequency determine current effective value, and current effective value is current density virtual value divided by the contact area of tool heads and plate.Progressive molding microsecond delay, small size contact, thus make current density virtual value more easily reach threshold value.
The computational methods of current density virtual value are as follows:
Because electric current is comparatively large, use transformer to measure electric current, I=V X 80/0.1, wherein, I is the current value virtual value flowing through plate, and V is the induced voltage of oscilloscope display, and 80 is the mutual inductance of transformer, and 0.1 is transformer outer meeting resistance.
The contact area of tool heads and plate is estimated as A=π r Δ h, and wherein A is tool heads and plate contact area, and r is tool heads radius, and Δ h is the tool heads interlayer amount of feeding, as shown in Figure 5.
Current density virtual value is estimated as J=I/A, and wherein J is the current density flowing through plate, and I is the current value flowing through plate, and A is the contact area of tool heads and plate.That is, J=I/ π r Δ h.
4, start lathe, starting impulse power supply, start progressive molding; During formed machining, first ensure that tool heads completes first interlayer volume under pressure, after contacting with plate is stable, restart pulse power supply, avoids because loose contact produces electric spark;
5, after shaping terminates, lathe and the pulse power is closed; After process finishing, out of service the while of the pulse power and lathe, too early power-off should be avoided to cause plate to break, slow power-off also will be avoided to cause plate calcination.
Electro plastic effect is the coefficient results of several physical such as joule heating effect, magnetic compression effect, kelvin effect and pure electro plasticity effect, these effects are all relevant with current density, current density is more large more, and electro plastic effect is more remarkable, and the forming property of plate is better.Because power supply uses the pulse power, therefore current density uses current density virtual value (the current density root mean square in one-period, RootMeanSquare, RMS) represent, the forming property (electro plastic effect of plate) of plate uses cracking depth (FractureDepth) and forming limit angle (FormingLimitAngle) to represent in addition, cracking depth and forming limit angle larger, the forming property of plate is better.Fig. 3 gives cracking depth under different current density virtual value and forming limit angle.
By Fig. 3 (J in Fig. 3
prepresent density peak value) known, when current density virtual value is more than or equal to 95A/mm
2time, the forming property of plate increases considerably, therefore can by 95A/mm
2as the threshold value of current density virtual value, after exceeding this threshold value, plate has good forming property.Therefore high, the forming accuracy of Sheet Metal Forming Limit and forming quality good.Present invention reduces the recrystallization temperature (225 DEG C from routine have been reduced to less than 180 DEG C) of plate, the part (part formed after Sheet Metal Processing) of good quality can be obtained at a lower temperature; And the output voltage of the pulse power of the present invention is width is that the narrow point of 60-80 μ s impacts triangular pulse, compared to other power supplys (dc source or the other forms of pulse power, as square-wave pulse power source etc.), the Joule heat that the pulse power of the present invention produces is few, avoid plate temperature too high after oxidation and the growing up of microcosmic crystal grain, further improve sheet forming quality.Therefore method of work of the present invention makes that Sheet Metal Forming Limit is high, forming accuracy and forming quality good, and the part of good quality can be obtained at a lower temperature.
As a modification of the present invention, the current density virtual value flowing through plate is 95-115A/mm
2.When the current density virtual value flowing through plate is more than or equal to 95A/mm
2time, plate has good forming property, but, be limited to the power output of power supply, current density virtual value can not be infinitely great, and after sheet metal formability acquires a certain degree, the requirement of processing can be met, do not need unlimited increase, in order to avoid cause energy waste.Inventor finds, when current density virtual value is 95-115A/mm
2time, can either make that Sheet Metal Forming Limit is high, forming accuracy and forming quality good, turn avoid energy waste.
In the present invention, be 95-115A/mm for making current density virtual value
2, the output voltage can getting the pulse power is 70-90V; Frequency is 200-350Hz.Now, the density peak value flowing through plate (is J in Fig. 3
p) be 950-1100A/mm
2.Table 1 gives the relation of output voltage, frequency, current density virtual value and density peak value.
Table 1
Preferably, output voltage is 90V, and frequency is 200-250Hz.
Inventor finds, under same current density virtual value, high voltage low frequency relative low voltage high-frequency, electro plastic effect is more obvious, and such as output voltage is 90V, and frequency is 200-250Hz and output voltage is 70V, current density virtual value when frequency is 250-350Hz is substantially equal, but the former sheet metal formability is better than the latter, therefore preferably output voltage is 90V, and frequency is 200-250Hz.
At work, the metallographic structure evolution process of plate as shown in Figure 4, with 96A/mm
2under current density virtual value, drip molding carries out cutting and gets a little, sample position as shown in (a) in Fig. 4, can observe that progressive molding process starts to be shaped, starts to power up, centre, Bao district, end zone Microstructure evolution process.
In Fig. 4, (b) is the original metallographic structure of plate, is made up of the equi-axed crystal of size inequality, and mean grain size (averagegrainsize) is at about 13um; As shown in (c) in Fig. 4, for whole plate from be formed into terminate different parts sampling metallographic structure figure, representative be the process that in whole forming process, deformation temperature, strain rate and deformation extent increase gradually.Wherein:
(c1) for test specimen starts the tissue of processing part, this Some tools head starts formed machining, but do not power up, for low temperature progressive molding, work hardening and Recovery Process are greater than dynamic recrystallization and softening process, the crystal grain rotation caused due to local plastic deformation creates a large amount of deformation texture, and the slippage of basal plane and the twin of the conical surface are the main deformation mechanism of alloy cold deformation, therefore produce a large amount of twin;
(c2) tissue of electric machining part is rushed for test specimen starts to promote blood circulation, now temperature is below 180 DEG C, part original grain affects by temperature rise and starts to grow up, simultaneously, first tiny dynamic recrystallization crystal grain start to increase at grain boundaries, the twin, dislocation and the machining stress that are formed due to partial mold distortion and surface mechanical enhancement progressively disappear, but still have part twin and coarse-grain to exist;
(c3) temperature rises to about 250 DEG C, and due to the rising of temperature and the increase of deformation extent, twin disappears substantially, dynamic recrystallization crystal grain showed increased, but dynamic recrystallization is still incomplete, and crystal grain individual size gap is larger;
(c4) temperature rises to about 300 DEG C, shaping Bao district, deformation temperature is higher, deformation extent is very large, sheet forming corner connection proximal pole limit value, sheet metal deformation amount and section Reducing thickness also reach maximum, and dynamic recrystallization more easily carries out, obtain uniform ultrafine-grained (UFG) microstructure, the crystallite dimension of more than 90% is at below 5um;
(c5) temperature remains on about 300 DEG C, and for finally shaping the tissue of part, electric pulse action time is shorter, and sheet metal deformation degree is relatively little, and dynamic recrystallization is incomplete, and therefore, relative Bao district, this part exists comparatively large grain size.(c6) be the non-crushed element of plate near shaping end zone, all the time do not contact with tool heads, microstructure does not have great changes relative to the original metallographic of plate, crystallite dimension change is little, but create a little twin, illustrate that this region affects by contiguous deformed area and there occurs small deformation, illustrate that the heat affected area that electric pulse assists progressive molding process is very little simultaneously, this, surrounding plate rapid heat dissipation little with region, thermal center (-tre) should have relation.
When plate progressive molding, tool heads contacts with plate upper surface, needs to lubricate, usually at plate upper surface coating lubricating oil, lubricating grease and equadag coating etc., but lubricating oil, lubricating grease easily produce barrier film between plate and tool heads, impact conduction; Equadag coating is poor at panel surface adhesive ability, easily causes electric arc, does not have lubrication.The present invention smears molybdenum disulfide powder coating at the upper surface of plate, and the thickness of molybdenum disulfide powder coating is 0.08-0.12mm.Operationally, tool heads presses down contact plate, the molybdenum disulfide powder coating near tool for destroying head, forms molybdenum disulfide powder, is deposited near tool heads, plays lubrication; And after molybdenum disulfide powder coating is destroyed, tool heads contact plate, can conduct electricity.Lubricant of the present invention both can not affect conduction, can play good lubricant effect again.
Molybdenum disulfide powder coating can have multiple method to obtain, preferably, by molybdenum disulfide powder and acetone soln according to 1g:5ml mixing and stirring, form lubricant, by the upper surface of lubricant uniform application at plate, plate is placed in ventilation more than 30 minutes, acetone soln is evaporated and dries, molybdenum disulfide powder coating can be obtained.In order to obtain lubricant effect better, the order number of molybdenum disulfide powder is more than or equal to 800 orders, and acetone soln purity is more than 95%.
Plate is preferably AZ31B plate, and the thickness of plate is 0.8-1.2mm.
In the present invention, the condition of work of lathe is: the speed of mainshaft of lathe is 120-200r/min, and the tool heads diameter of lathe is 7-9mm, and every layer of volume under pressure of tool heads is 0.1-0.2mm, the shaping feed rate of tool heads is 1000-1800mm/min, and single forming limit angle is less than or equal to 65 °; The pulse power is high energy pulse power supply, and its output frequency is at 100-900Hz continuously adjustabe, and output voltage is at 30-140V continuously adjustabe.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a plate Electroplastic progressive molding device, is characterized in that, comprises lathe and the pulse power, the workbench of described lathe is fixed with plate clamping device, the main shaft of described lathe is provided with grip block, brush carrier and retainer, wherein:
Described grip block is connected with the tool heads for processing described plate;
Described brush carrier is L-type, and upper end is fixed on described main shaft, and lower end is connected with for the brush against described grip block;
Described retainer is U-shaped, one end is fixed on described main shaft, the other end to reach below described plate and is connected with for the push-down head against described plate lower surface, and described tool heads and push-down head are just right, and the two poles of the earth of the described pulse power connect described brush and push-down head respectively.
2. plate Electroplastic progressive molding device according to claim 1, it is characterized in that, the transverse sleeves that described brush carrier comprises vertical supports and is connected with described vertical supports, the upper end of described vertical supports connects described main shaft, described brush is arranged in described transverse sleeves, and the rear portion of the inherent described brush of described transverse sleeves is provided with the first preloading spring; The surface of described grip block is cylindrical, described brush is processed with the concave arc adapted with the surface of described grip block.
3. plate Electroplastic progressive molding device according to claim 1, it is characterized in that, the U-shaped guide pillar that described retainer comprises vertical guide pin bushing and is connected with described vertical guide pin bushing, the upper end of described vertical guide pin bushing is fixed on described main shaft, lower end has guide groove, one end of described U-shaped guide pillar reaches in described guide groove, and the other end to reach below described plate and connects described push-down head, is provided with the second preloading spring in described guide groove.
4. according to the arbitrary described plate Electroplastic progressive molding device of claim 1-3, it is characterized in that, insulator cap is provided with between described main shaft and grip block, described main shaft is provided with insulation sleeve, described brush carrier and retainer are arranged on described insulation sleeve, and the material of described insulator cap and insulation sleeve is polyether-ether-ketone.
5. plate Electroplastic progressive molding device according to claim 1, it is characterized in that, described plate clamping device comprises base plate and upper support frame, is provided with column between described base plate and upper support frame, wherein:
The alternate internal of described upper support frame is provided with longitudinal bracing block and cross-brace block;
Described upper support frame is also provided with the briquetting for fixing described plate;
Described upper support frame, longitudinal bracing block, cross-brace block and briquetting have bolt hole.
6. plate Electroplastic progressive molding device according to claim 5, it is characterized in that, described plate clamping device is fixed on described workbench by jig, be provided with felt pad between described base plate and workbench and between base plate and jig, described felt pad material is mica.
7. plate Electroplastic progressive molding device according to claim 1, it is characterized in that, described tool heads comprises forming head and nested handle, and described forming head material is YG15 Hardmetal materials, and described nested handle material is Cr12 die steel material.
8. the method for work of claim 1-7 arbitrary plate Electroplastic progressive molding device, it is characterized in that, described magnesium alloy sheet is by lathe progressive molding, described magnesium alloy sheet is connected with the pulse power, the output voltage of the described pulse power is that narrow point impacts triangular pulse, it is 60-80 μ s that described narrow point impacts triangular pulse width, the output voltage of the described pulse power is more than or equal to 70V, the output frequency of the described pulse power is more than or equal to 200Hz, and the current density virtual value flowing through described magnesium alloy sheet is more than or equal to 95A/mm
2.
9. method of work according to claim 8, is characterized in that, the current density virtual value flowing through described plate is 95-115A/mm
2, the output voltage of the described pulse power is 70-90V, and frequency is 200-350Hz, and the density peak value flowing through described plate is 950-1100A/mm
2.
10. method of work according to claim 8 or claim 9, it is characterized in that, the upper surface of described plate is coated with the molybdenum disulfide powder coating of lubricate, and the thickness of described molybdenum disulfide powder coating is 0.08-0.12mm; The preparation method of described molybdenum disulfide powder coating is: by molybdenum disulfide powder and acetone soln according to 1g:5ml mixing and stirring, form lubricant, by the upper surface of described lubricant uniform application at described plate, described plate is placed in more than 30 minutes, ventilation, acetone soln is evaporated dry, molybdenum disulfide powder coating can be obtained; The order number of described molybdenum disulfide powder is more than or equal to 800 orders, and described acetone soln purity is more than 95%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510408904.2A CN105107933B (en) | 2015-07-13 | 2015-07-13 | Plate Electroplastic progressive molding device and its method of work |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510408904.2A CN105107933B (en) | 2015-07-13 | 2015-07-13 | Plate Electroplastic progressive molding device and its method of work |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105107933A true CN105107933A (en) | 2015-12-02 |
| CN105107933B CN105107933B (en) | 2017-03-01 |
Family
ID=54656167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510408904.2A Active CN105107933B (en) | 2015-07-13 | 2015-07-13 | Plate Electroplastic progressive molding device and its method of work |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105107933B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105710205A (en) * | 2016-04-06 | 2016-06-29 | 北京航空航天大学 | Self-blocked heating incremental forming device for whole plate |
| CN105945137A (en) * | 2016-06-27 | 2016-09-21 | 南京航空航天大学 | Incremental forming device and method based on induction heating |
| CN106311876A (en) * | 2016-11-15 | 2017-01-11 | 山东大学 | Complicated thin-walled workpiece formation system and method based on progressive formation and additive manufacturing |
| CN106311875A (en) * | 2016-11-01 | 2017-01-11 | 山东大学 | Powered-on rotating tool system for board electroplastic incremental forming |
| CN106345897A (en) * | 2016-11-01 | 2017-01-25 | 山东大学 | Electro-plastic incremental forming device for sheets |
| CN106493216A (en) * | 2016-11-01 | 2017-03-15 | 山东大学 | Plate Electroplastic is without the compound progressive molding system of mould |
| CN106563715A (en) * | 2016-11-03 | 2017-04-19 | 山东大学 | Panel veneer electroplastic multifunctional V-shaped bending die and system |
| CN108994102A (en) * | 2018-07-24 | 2018-12-14 | 哈尔滨工业大学 | A kind of hollow shunting microsecond delay mold of pulse current auxiliary blank and method |
| CN109277468A (en) * | 2018-08-21 | 2019-01-29 | 上海交通大学 | A kind of laminated plate synchronized links and progressive Composite forming tool and method |
| CN109622960A (en) * | 2018-12-25 | 2019-04-16 | 上海交通大学 | A kind of compound molding device and method of plate |
| CN114749944A (en) * | 2022-04-14 | 2022-07-15 | 上海理工大学 | Electroplastic shearing processing device and using method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69011895T2 (en) * | 1989-02-20 | 1995-02-02 | Nippon Steel Corp | Device for scoring grain-oriented electrical steel strips. |
| CN201744547U (en) * | 2009-02-11 | 2011-02-16 | 福特全球技术公司 | System for incrementally forming workpiece |
| WO2012030835A2 (en) * | 2010-08-30 | 2012-03-08 | The Penn State Research Foundation | Electrical-assisted double side incremental forming and processes thereof |
| CN102527830A (en) * | 2012-02-09 | 2012-07-04 | 上海交通大学 | Electroplastic incremental forming device and method for plates |
| EP2505279A1 (en) * | 2011-03-29 | 2012-10-03 | Mta Sztaki | Device for two sided incremental sheet forming |
| CN103071726A (en) * | 2013-02-07 | 2013-05-01 | 江西理工大学 | Single-point longitudinal vibration controllable progressive forming system for metal plate |
-
2015
- 2015-07-13 CN CN201510408904.2A patent/CN105107933B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69011895T2 (en) * | 1989-02-20 | 1995-02-02 | Nippon Steel Corp | Device for scoring grain-oriented electrical steel strips. |
| CN201744547U (en) * | 2009-02-11 | 2011-02-16 | 福特全球技术公司 | System for incrementally forming workpiece |
| WO2012030835A2 (en) * | 2010-08-30 | 2012-03-08 | The Penn State Research Foundation | Electrical-assisted double side incremental forming and processes thereof |
| EP2505279A1 (en) * | 2011-03-29 | 2012-10-03 | Mta Sztaki | Device for two sided incremental sheet forming |
| CN102527830A (en) * | 2012-02-09 | 2012-07-04 | 上海交通大学 | Electroplastic incremental forming device and method for plates |
| CN103071726A (en) * | 2013-02-07 | 2013-05-01 | 江西理工大学 | Single-point longitudinal vibration controllable progressive forming system for metal plate |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105710205A (en) * | 2016-04-06 | 2016-06-29 | 北京航空航天大学 | Self-blocked heating incremental forming device for whole plate |
| CN105945137A (en) * | 2016-06-27 | 2016-09-21 | 南京航空航天大学 | Incremental forming device and method based on induction heating |
| CN106493216B (en) * | 2016-11-01 | 2018-01-23 | 山东大学 | Plate Electroplastic is without the compound progressive molding system of mould |
| CN106311875A (en) * | 2016-11-01 | 2017-01-11 | 山东大学 | Powered-on rotating tool system for board electroplastic incremental forming |
| CN106345897A (en) * | 2016-11-01 | 2017-01-25 | 山东大学 | Electro-plastic incremental forming device for sheets |
| CN106493216A (en) * | 2016-11-01 | 2017-03-15 | 山东大学 | Plate Electroplastic is without the compound progressive molding system of mould |
| CN106345897B (en) * | 2016-11-01 | 2018-01-23 | 山东大学 | Plate Electroplastic progressive molding device |
| CN106563715A (en) * | 2016-11-03 | 2017-04-19 | 山东大学 | Panel veneer electroplastic multifunctional V-shaped bending die and system |
| CN106311876A (en) * | 2016-11-15 | 2017-01-11 | 山东大学 | Complicated thin-walled workpiece formation system and method based on progressive formation and additive manufacturing |
| CN108994102A (en) * | 2018-07-24 | 2018-12-14 | 哈尔滨工业大学 | A kind of hollow shunting microsecond delay mold of pulse current auxiliary blank and method |
| CN108994102B (en) * | 2018-07-24 | 2019-09-13 | 哈尔滨工业大学 | A kind of hollow shunting microsecond delay mold of pulse current auxiliary blank and method |
| CN109277468A (en) * | 2018-08-21 | 2019-01-29 | 上海交通大学 | A kind of laminated plate synchronized links and progressive Composite forming tool and method |
| CN109277468B (en) * | 2018-08-21 | 2019-09-27 | 上海交通大学 | A kind of laminated plate synchronized links and progressive Composite forming tool and method |
| CN109622960A (en) * | 2018-12-25 | 2019-04-16 | 上海交通大学 | A kind of compound molding device and method of plate |
| CN114749944A (en) * | 2022-04-14 | 2022-07-15 | 上海理工大学 | Electroplastic shearing processing device and using method thereof |
| CN114749944B (en) * | 2022-04-14 | 2023-04-25 | 上海理工大学 | Electroplastic shearing processing device and application method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105107933B (en) | 2017-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105107933A (en) | Electroplastic incremental forming device for plate and working method thereof | |
| CN102527830B (en) | Electroplastic incremental forming device and method for plates | |
| CN105710205B (en) | Plate is overall from resistance heating progressive molding device | |
| Haron et al. | Investigation on the influence of machining parameters when machining tool steel using EDM | |
| US10105744B2 (en) | Press die for electrically assisted manufacturing | |
| CN101934337B (en) | Ring-shaped electro-plastic self-piercing riveting system | |
| CN204524463U (en) | A kind of electric spark assists milling device | |
| CN105081700A (en) | Cylindrical accessory machining method and system for metal mold | |
| CN109482690B (en) | Current-assisted roll forming method for special-shaped section pipe fitting made of difficultly-deformed material | |
| CN206200585U (en) | The axial perforating device of camshaft VCT hole punchers | |
| CN104384310A (en) | Incremental forming method with auxiliary base for plates | |
| CN102861944A (en) | Electrified heating auxiliary device used for milling | |
| CN108715926B (en) | Ultrasonic impact device | |
| CN107552701A (en) | A kind of rollforming equipment of powered plastic device | |
| CN105033016A (en) | Magnesium alloy sheet electroplastic incremental forming method | |
| CN107177722B (en) | A kind of preparation facilities of high-strength high hard metal material surface gradient nano structure | |
| CN203351289U (en) | Seven-station numerical control busbar processing machine | |
| CN202479427U (en) | Numerical control riveting machine | |
| CN106493216B (en) | Plate Electroplastic is without the compound progressive molding system of mould | |
| CN103433595A (en) | Electrode cap overlay welding device with automation function | |
| CN101327533A (en) | Method for machining carbide alloy screwed hole by electric spark | |
| CN203621508U (en) | Single-point supersonic vibration incremental forming main shaft device | |
| CN106624595B (en) | A kind of measurable flexible electric spark deposition rolling tool of rolling power | |
| CN201702391U (en) | Bending vibration ultrasonic cutting device of gang tool type numerically controlled lathe | |
| CN203401197U (en) | Electrode cap overlaying device having automation function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |