CN103495732B - The densified pressure head of jet deposition metal slabs, device and application - Google Patents
The densified pressure head of jet deposition metal slabs, device and application Download PDFInfo
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Abstract
The invention discloses the densified pressure head of jet deposition porous sheet material, device and application.Disclosed pressure head is provided with installs end face and working end, and working end is provided with the first pressurize district, main nip, precompressed zone and the second pressurize district, and is followed successively by the first pressurize district, main nip, precompressed zone and the second pressurize district along pressure head step direction; Wherein: main nip is horizontal plane, precompressed zone is inclined-plane and independently nip is to installation end face tilt, and Liang Ge pressurize district act as material flowing when preventing densified.There are four regions smoothly transitted in pressure head of the present invention, makes material deformation continuous, can not cause cracking in compaction process.Also disclose the densification device being provided with above-mentioned pressure head.During device machining sheet disclosed in utilization, the pressure surface horizontal force of main nip is on slab, and the reduction in pass of pressure head is greater than the inclined height of pressure head precompressed zone relative to main nip.The uniformity of microscopic structure in blank can be retained in densification process.
Description
Technical field
The invention belongs to the densified processing technique field of metal material, be specifically related to the densified pressure head of a kind of jet deposition porous sheet material, device and application.
Background technology
Compare with preparation method with the material forming such as casting, powder metallurgy, jet deposition not only has the advantage of the one step forming of casting, also has the advantage that rapid solidification cooldown rate is high, is a kind of the metal forming technology between casting with powder metallurgy.Though spray deposition technology has, cooldown rate is high, cost-effective, advantage applied widely, but the relative density of jet deposition state blank is generally 85% ~ 90%, a large amount of micropore is there is in blank, metallurgical binding completely is not all reached between particle, between bed boundary, material mechanical performance can be caused to decline, and particularly mechanical behavior under high temperature declines to a great extent because hole exists; Also can cause the sharply decline of crystallized ability, jet deposition blank is almost not moulding.Therefore its mechanical property and forming property must be improved by follow-up densification technique.
CN1873043 discloses densifying processing method and the device of large jet deposited, and the program is mainly applied and ingot blank, compact, ring base and slab.Disclosed method is that employing one facet and a tapered plane smoothly transit and form or wedge shaped pressure head that inclined-plane forms, common press is adopted to impose certain pressure, local small deformation is carried out for densified jetting deposited square shaped blank in large size in mould, facet part is main deformed area, inclined-plane is predeformation district, progressively advance to bevel direction, successively suppress, mould have employed the mode of combination die, between the passage compressed into, progressively withdraw from the module of wedge pressure stepping front end, discharge a part of space, blank is pushed ahead under the effect of the transverse component on wedge pressure pressure head inclined-plane, realize horizontal shear deformation, densified and the dual distortion of horizontal Shear Flow of comprehensive compacting downwards, finally realize the metallurgical binding under the densified and shear action of the entirety of jet deposition blank.Disclosed device comprises bonding press and press bed, press bed is provided with square combination mould, movable composition module is provided with in square combination mould, bonding press top is provided with step-by-step movement propulsion plant, step-by-step movement propulsion plant is provided with slide plate, slide plate is provided with wedge shaped pressure head, press bed is provided with the stopping means corresponding with bonding press.Described wedge shaped pressure head end face sub-fraction is plane remainder is inclined-plane, and planar section and chamfered portion adopt low-angle excessive.Described square combination mould is provided with electric heating heater.
For jet deposition porous slab, shear flow when method disclosed in CN1873043 or device are extruded by blank, hole is elongated, disperse and even seam, improves plastic deformation ability and the mechanical property of material; Especially by wedge shaped pressure head progressively accumulation small deformation and realize overall densification.Its Problems existing is:
(1) by the restriction of equipment tonnage and the strength of materials, the sheet material of large extrusion ratio and the high aluminium alloy of elevated temperature strength and composite thereof are difficult to be shaped, and formed machining is with high costs;
(2) existing shaped as frame restriction shaping and haydite rolling are when shaped sheet owing to being subject to equipment size impact, are difficult to the slab that forming dimension is large;
(3) due to the impact by deposit preform forming property difference, and common wedge pressure is made as two is shaped to compression, therefore easily there is cracking in jet deposition aluminium alloy and composite slab thereof in pressing process, and pressure head is comparatively obvious at the impression of compacting steel slab surface, and fine and close forming effect is poor.
Summary of the invention
For prior art Problems existing, an object of the present invention is to provide a kind of densified pressure head of jet deposition metal slabs.
For this reason, the densified pressure head of jet deposition metal slabs provided by the invention is provided with installs end face and working end, described working end is provided with the first pressurize district, main nip, precompressed zone and the second pressurize district, and is followed successively by the first pressurize district, main nip, precompressed zone and the second pressurize district along pressure head step direction; Described main nip is horizontal plane, described precompressed zone be inclined-plane and autonomous nip to installation end face tilt, for smoothly transitting between described main nip and precompressed zone; The material acting as main nip when preventing densified in described first pressurize district flows to the rightabout of pressure head step direction; The material acting as main nip and precompressed zone when preventing densified in described second pressurize district flows to pressure head step direction.
Described first pressurize district be inclined-plane and autonomous nip to installation end face tilt, for smoothly transitting between described first pressurize district and pressure head sidewall, for smoothly transitting between described first pressurize district and zone of positive pressure; Described second pressurize district is horizontal plane, for smoothly transitting between described second pressurize district and pressure head sidewall, for smoothly transitting between described second pressurize district and precompressed zone.
The roughness of described main nip is less than the roughness in the first pressurize district and the second pressurize district, and the roughness of described precompressed zone is less than the roughness in the first pressurize district and the second pressurize district.
Compared with prior art, the advantage of the densified pressure head of jet deposition metal slabs of the present invention is:
(1) there is the higher pressurize district of two surface roughnesses in pressure head of the present invention at two ends, by the flowing of sheet material under the suppression pressurize district of pressurize district of pressure head in pressing process, thus make the slab under main nip and precompressed zone in compaction process, be in three-dimensional compressive stress state and quasi-iso static pressing state, thus there is the phenomenon of cracking in the slab that conventional compacting distortion can be avoided often to cause in pressing process.
(2) there are four continuous print regions in pressure head of the present invention, smoothly transits between each region with fillet, and therefore in compaction process, its distortion continuously, can not cause unexpected large deformation or stress concentrate and crack.
(3) the employing round-corner transition of adjacent nip, is conducive to preventing steel slab surface owing to being out of shape uneven outlet crackle, also can reduce the impression occurring pressure head in pressing process simultaneously.Lower by the rigidity of dense material, mobile performance is better, and the knuckle between adjacent nip can suitably reduce.
(4) pressure surface of main nip and precompressed zone adopts less surface roughness, is conducive to the flowing of blank surface in pressing process, produces better densified effect; Liang Ge pressurize district adopts higher surface roughness to be then for suppressing slab flowing along its length in pressing process, makes the blank in these two regions produce good quasi-iso static pressing effect, prevents blank from ftractureing in pressing process.
(5) inclination angle, pressurize district is less, then pressurize district suppresses the effect that blank flows along slab length to strengthen, but can reduce the pressure of main nip, is unfavorable for the densified distortion of main nip blank.Lower by the rigidity of dense material, mobile performance is better, then inclination angle can reduce.
Another object of the present invention is to provide a kind of jet deposition porous sheet material densification device, this device comprises pressure head, base plate, punching block, electric calorifie installation and stopping means, and described pressure head is above-mentioned pressure head.
Aluminium backing plate is provided with in described punching block.
Compared with prior art, the advantage of jet deposition porous sheet material densification device of the present invention is:
In the densification device of jet deposition metal slabs provided by the invention, compacting pressure head both sides have dwell region, pressurize district adopts higher surface roughness to suppress to be positioned at the flowing of the blank under pressurize district, the blank under the main nip of pressure head and precompressed zone can be effectively made to produce three-dimensional compressive stress in pressing process, improve the plastic deformation ability of blank, suppress the generation of blank crackle in pressing process.And, the main nip of pressure head and precompressed zone pressure surface adopt smooth finish surface, and adopt round-corner transition between main nip and precompressed zone, the resistance of pressing process surface to blank Plastic Flow can be reduced, strengthen the plastic deformation of blank under main nip and precompressed zone, make the hole of porous blank broken and make up by the shearing of blank and Plastic Flow, realize fine and close.In addition, the entirety that device of the present invention can realize big size porous slab under the press device of lower tonnage is fine and close, and good by the sheet material compactness after quasi-iso static pressing densification, relative density reaches more than 99%.
First pressurize district and the acting in conjunction of the second pressurize district suppress material in densification process to flow along slab length direction, be applied to the compression on slab length direction by the aluminium backing plate of slab termination simultaneously, and in pressing process, pressure head is applied to compression on slab thickness direction and punching block and is applied to compression on width of plate slab direction, jointly realizes main nip and precompressed zone material in densification process and is in quasi-iso static pressing state.And the suitable size in pressurize district can make blank that blank in pressing process can be suppressed under the effect in pressurize district along the flowing of slab length direction, to improve the isostatic pressed effect of main nip and precompressed zone blank.
The densification device that another object of the present invention is to provide above-mentioned jet deposition metal slabs is for the application of processing metal alloy and composite board thereof, and the feature of this application is:
The pressure surface horizontal force of main nip is on the slab suppressed by pressure;
The reduction in pass of pressure head is greater than the inclined height of pressure head precompressed zone relative to main nip.
The feature of the densification device processing metal sheet alloy of jet deposition metal slabs of the present invention is utilized to be:
(1) uniformity of microscopic structure in jet deposition blank can be retained in densification process, the phenomenon that the densification that the densification techniques such as extruding or hot pressing can be avoided to cause is uneven, obtain uniform fine and close, particularly for particulate reinforced composite, the phenomenon that enhancing distribution of particles that other method for densifying cause is uneven can be kept away, thus ensure the uniformity of mechanical property;
(2) this fine and close method can make the blank of deformed area be out of shape under the accurate static pressure state of three-dimensional compressive stress, is conducive to the deformability improving blank, avoids the phenomenon of the blank cracking occurred in common wedge shape pressing process;
(3) pure aluminum plate is placed between blank end and mould side wall in this fine and close method compaction process, can ensure that length direction has certain compression in compaction process, plastic deformation along its length in slab process can be made again simultaneously, make fine and close better effects if;
(4) this fine and close method adopts the small deformation successively fine and close entirety densification realizing deposit preform, and institute's energy requirement is little, the fine and close equipment of large-tonnage required when other injection deposition blanks can be avoided fine and close;
(5) this method temperature rise effect in compaction process is little, keeps lower deformation temperature, can retain the feature that injection deposition blank microscopic structure is tiny, avoids temperature rise to cause the alligatoring of microscopic structure.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and detailed description of the invention, the present invention is described in further detail.
Fig. 1 is the structural representation of densification device of the present invention, each coded representation in figure: 1-pressure head, 2-slab, 3-punching block, 4-electric calorifie installation, 5-base plate;
Fig. 2 is the sectional view of Fig. 1 shown device pressure head;
Fig. 3 is jet deposition SiCP/Al-8.5Fe-1.3V-1.7Si composite slab quasi-iso static pressing compacting front and back metallographic microstructure in embodiment 2, and wherein Fig. 3 (a) is deposited, and Fig. 3 (b) is compacting state;
Fig. 4 is the transmission electron microscope photo in embodiment 2 after jet deposition SiCP/Al-8.5Fe-1.3V-1.7Si composite slab quasi-iso static pressing compacting densification.
Detailed description of the invention
The installation end face of the densified pressure head of jet deposition metal slabs of the present invention refers to end face pressure head is installed on drive unit.
The operative end surface of the densified pressure head of jet deposition metal slabs of the present invention refers to the end face contacted with metal slabs in pressing process.
Pressure head step direction of the present invention refers to the progressively moving direction of pressure head in pressing process.The step distance that after completing single compacting, pressure head is pushed ahead should be less than or equal to the size of main nip in charge length direction.
Before reduction in pass of the present invention is referred to and adjusted by this height depressed of pressure head and stopping means after adjustment stopping means, pressure head depresses the difference of height, no longer adjusts after stopping means adjustment before pressure head completes the densification of a whole slab thickness.
With reference to figure 1, metal slabs densification device of the present invention comprises pressure head 1, base plate 5, punching block 3, electric calorifie installation 4 and stopping means, described punching block is placed on base plate, described pressure head is placed in above punching block, described electric calorifie installation is located in the sidewall of punching block, with reference to figure 2, the working face of pressure head 1 is divided into the first pressurize district, main nip, precompressed zone, region, four, the second pressurize district respectively from side to opposite side.In addition, it should be noted that, the ram shaft that Fig. 2 provides is T-shaped to cross sectional shape, the part that on this T-shaped pressure head, radial dimension is larger is force transmission region, the effect of force transmission region is acted on by fine and close slab to pressure head by the dynamic changes process of forcing press, and run-off the straight under the asymmetric reaction force preventing pressure head from giving at slab.
Densification device of the present invention and the device gross discrimination disclosed in CN1873043 there are provided the pressure head in You Liangge pressurize district, one end of this external blank add one piece with the aluminium backing plate of blank uniform thickness, suppress slab in the flowing of length direction, to the compression be pressed on slab applying length direction, realize the densification of blank under accurate equal pressure, be conducive to avoiding the cracking of blank in pressing process and reducing the impression of steel slab surface.
Aluminium backing plate of the present invention is for limiting slab flowing along its length, aluminium backing plate contacts slab one end all the time in compaction process, all the time compression is applied in one end of slab, play the flowing along its length of restriction slab and distortion, and fine aluminium is than soft by dense material, therefore also permission slab has the distortion on certain length direction in compaction process, improves densified effect.
The densification device of jet deposition metal slabs of the present invention is adopted to carry out densification to slab, the force transmission region of pressure head is horizontally fixed on forcing press top shoe, to make the pressure surface horizontal force of the main nip of pressure head on the slab suppressed by pressure, for the metal slabs of thickness at 10 ~ 30mm, the firing equipment of densification device is incubated 30min after being heated to the temperature needed for material plasticity distortion before compaction, even to make by the heating of plate blank of densification.
Device of the present invention is adopted to carry out densifiedly adding man-hour, when disclosed in its method or relevant parameter and CN1873043, the difference of processing method is to adopt the quasi-iso static pressing device designed by the present invention fine and close, reduction in pass need slightly larger than the inclined height of pressure head precompressed zone relative to main nip, to ensure that pressure head second pressurize district can touch steel slab surface and play the effect suppressing slab length to flowing when suppressing.
Embodiment 1:
Follow technical scheme of the present invention, with reference to figure 1 and Fig. 2, the concrete structure size of the densification device of the jet deposition metal slabs of this enforcement is as follows:
Punching block is the square frame-shaped without base plate, inner wall size length × wide × height is 500mm × 110mm × 180mm, and punching block thickness is 60mm, adopts 45 steels to do, on punching block sidewall, vertical direction is evenly arranged the stainless steel electrical bar that 16 single power are 1kW, and electrical bar external diameter is 20mm.
Base plate size is long × wide × thick is 700mm × 300mm × 180mm, and punching block thickness is 60mm, and adopt 45 steels to do, on punching block sidewall, vertical direction is evenly arranged the stainless steel electrical bar that 16 single power are 1kW, and electrical bar external diameter is 20mm.
The pressure head of the present embodiment adopts 45 steels to do, and the length of pressure head × wide × thick is 110mm × 90mm × 300mm, and fall head meets on the downside of pressure head main pressure surface to force transmission region and is highly greater than shaped as frame punching block height about 60mm.Pressure head force transmission region is of a size of 200mm × 110mm × 80mm, Liang Ge pressurize district is size 110mm × 30mm, precompressed zone is of a size of 110mm × 20mm, main nip is of a size of 110mm × 10mm, that is, the first pressurize district is of a size of 30mm in charge length direction, and the second pressurize district is of a size of 30mm in charge length direction, main nip is of a size of 10mm in charge length direction, and precompressed zone is of a size of 20mm in charge length direction.Other are of a size of:
First pressurize district with respect to the horizontal plane angle of inclination be 1 ° ~ 2 °; Precompressed zone angle of inclination is with respect to the horizontal plane 5 ° ~ 6 °;
Between the first pressurize district and pressure head sidewall, the radius of transition arc is 10mm;
Between the first pressurize district and main nip, the radius of transition arc is 20mm;
Between main nip and precompressed zone, the radius of transition arc is 20mm;
The radius of precompressed zone and the interval transition arc of the second pressurize is 20mm;
Between the second pressurize district and pressure head sidewall, the radius of transition arc is 10mm;
The roughness of precompressed zone and main nip is 0.8 μm, and the roughness in the first pressurize district and the second pressurize district is 12.5 μm.
Embodiment 2:
The device in embodiment 1 and the portable spray co deposition device of crucible is utilized to prepare SiC
p/ Al-8.5Fe-1.3V-1.7Si composite slab.
Be chosen as the β-SiC of Mechanical Crushing in this embodiment as enhancing particle, average grain diameter is about 10 μm,
It is 460mm × 120mm × 30mm that jet deposition slab is first sawn into long × wide × thick, then planing operation grow up × wide × thick be the slab of 450mm × 110mm × (20 ~ 25) mm.6300kN forcing press platform is placed the base plate of device for compactly, makes base plate be positioned at the central area of pressing machine table-board, then punching block symmetry is positioned on base plate.Slab is flat in compacting punching block, puts into long × wide × thick fine aluminium slab for 50mm × 110mm × 15mm in one end of slab.The pressure head of obsession is installed on the T-slot of the top shoe of forcing press, the direction of T-slot is consistent in the length direction of punching block, can along the length direction translation of punching block inwall when compacting pressure head is slided along T-slot.The electric calorifie installation of device for compactly connects, and set temperature covers densification device with asbestos cloth, and temperature is incubated 30min after rising to design temperature.
Before concrete compacting, measure the distance on edge on face to punching block, slab top, be that distance that pressure head enters punching block to be greater than on slab upper surface to punching block along distance 1.0 ~ 2.0mm when compacting pressure head is depressed first, make the drafts depressed first be 1.0 ~ 2.0mm.
By compacting tool set electrified regulation before compacting, for aluminum alloy slab, heating-up temperature is 450 DEG C ~ 480 DEG C, cover punching block upper surface with asbestos in heating process and ensure homogeneous temperature, temperature is incubated 30min after being elevated to preset temperature, and during heating, pressure head enters compacting punching block, higher than steel slab surface, compacting distortion should be produced to avoid slab at low-temperature condition and causes slab to ftracture.
Steel slab surface is through planing operation, and downtrodden metal slabs original thickness is 30mm, and the fine aluminium plate thickness of slab one end equals the original thickness being pressed slab.
Depress pressure head first to suppress from one end away from fine aluminium backing plate of slab, the reduction in pass depressed first is 5% ~ 10%.The drafts of pressure head is controlled by stop.After single pressure, blank produces distortion, pressure head is depressed after lifting backward precompressed zone direction translation 8 ~ 10mm again, in translation motion, the drafts of pressure head remains unchanged, and suppresses after pressure head translation like this, and repeatedly circulation is rear until pressure head main nip contact fine aluminium backing plate, whole slab completes the compacting of a time, and drafts is 5% ~ 10%.
After whole order of classes or grades at school completes the pressure of a time 5% ~ 10%, insulation 20min, pressure head is moved to slab one end away from fine aluminium backing plate again, simultaneously by regulating the height of stop, the pressure of compacting pressure head is highly lowered 1.0 ~ 2.0mm, start the first time pressure of second compacting, after compacting, suppress identical with first, pressure head is again depressed after precompressed zone direction translation 8 ~ 10mm, until before pressure head main nip contact fine aluminium backing plate completes the together compacting of whole slab, the drafts of pressure head remains unchanged.The multiple tracks compacting of realization like this to slab is fine and close, and the drafts of per pass compacting densification is 1.0 ~ 2.0mm, when overall reduction is 12 ~ 15mm, completes the compacting to monoblock slab, realizes the entirety of slab fine and close.
Eventually through the local plastic deformation that pressure head produces for deposit preform compacting, make the fragmentation of the hole of plastic deformation area, make up, thus realize the densified of plastic deformation area.Due to the entirety densification being realized whole deposit preform by the accumulation of local deformation of precompressed zone.
In the present embodiment punching block sidewall graphite machine oil should be adopted before putting into blank to lubricate, after convenient compacting, blank deviating from.
During plant running, keep the main pressure surface horizontal force of pressure head in blank surface, avoid suppressing rear pressure head and leave impression in blank surface.
Single translation distance during pressure head translation should be less than or equal to the width of main pressure surface, and namely single translational movement is less than and equals 10mm, gets 8 ~ 10mm.
SiC in the present embodiment
pin/Al-8.5Fe-1.3V-1.7Si composite board, as shown in Fig. 3 (a), jet deposition blank owing to being involved in a large amount of gas in deposition process, and therefore in deposit preform, the border of deposited particles and the junction of SiC particle and matrix exist a large amount of hole, and its relative density is about 80%.After quasi-iso static pressing is densified, slab obtains effective densification, as shown in Fig. 3 (b), when overall reduction reaches 50%, slab is through the plastic deformation of aximal deformation value, between deposited particles, hole makes up and achieves metallurgical binding, and SiC particle is also combined well between matrix.In addition, SiC particle is uniformly distributed in the base.As can be seen from Figure 4, aluminum matrix alloy average grain size be 500 ~ 800nm, the Al in matrix
12(Fe, V)
3si dispersed granules is 60 ~ 100nm.
The SiC particle reinforce Al matrix composite pipes prepared by the inventive method has SiC even particle distribution, little in deformation process temperature rise, the disperse of matrix microscopic structure is tiny, and SiC particle is combined with matrix alloy well, the advantages such as the close property of composite is good, surface is little without micro-flaw, impression.
Claims (4)
1. the densified pressure head of jet deposition metal slabs, this pressure head is provided with installs end face and working end, it is characterized in that, described working end is provided with the first pressurize district, main nip, precompressed zone and the second pressurize district, and is followed successively by the first pressurize district, main nip, precompressed zone and the second pressurize district along pressure head step direction;
Described main nip is horizontal plane, described precompressed zone be inclined-plane and autonomous nip to installation end face tilt, for smoothly transitting between described main nip and precompressed zone;
The material acting as main nip when preventing densified in described first pressurize district flows to the rightabout of pressure head step direction;
The material acting as main nip and precompressed zone when preventing densified in described second pressurize district flows to pressure head step direction;
Described first pressurize district be inclined-plane and autonomous nip to installation end face tilt, for smoothly transitting between described first pressurize district and pressure head sidewall, for smoothly transitting between described first pressurize district and main nip; Described second pressurize district is horizontal plane, for smoothly transitting between described second pressurize district and pressure head sidewall, for smoothly transitting between described second pressurize district and precompressed zone;
The roughness of described main nip is less than the roughness in the first pressurize district and the second pressurize district, and the roughness of described precompressed zone is less than the roughness in the first pressurize district and the second pressurize district.
2. a densification device for jet deposition metal slabs, this device comprises pressure head, base plate, punching block, electric calorifie installation and stopping means, it is characterized in that, described pressure head is the densified pressure head of jet deposition metal slabs according to claim 1.
3. the densification device of jet deposition metal slabs as claimed in claim 2, is characterized in that, be provided with aluminium backing plate in described punching block.
4. the densification device of the jet deposition metal slabs described in Claims 2 or 3 is used for the application of processing metal alloy and composite board thereof, and it is characterized in that, this application comprises:
The pressure surface horizontal force of main nip is on downtrodden slab;
The reduction in pass of pressure head is greater than the inclined height of pressure head precompressed zone relative to main nip.
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| WO2022121211A1 (en) * | 2020-12-07 | 2022-06-16 | 佛山市恒力泰机械有限公司 | Intermittent continuous forming method and device for ceramic plate production |
| CN112757449A (en) * | 2020-12-07 | 2021-05-07 | 佛山市恒力泰机械有限公司 | Intermittent continuous forming method for ceramic plate production |
| CN116252035B (en) * | 2023-05-15 | 2023-09-26 | 杭州沈氏节能科技股份有限公司 | Step-by-step continuous diffusion welding equipment and diffusion welding method |
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| CN100378244C (en) * | 2006-04-27 | 2008-04-02 | 湖南大学 | Fabricating method for densifying jetting deposited square shaped blank in large size, and equipment |
| CN101168177A (en) * | 2007-11-07 | 2008-04-30 | 湖南大学 | Deformation method and device for gradient temperature wedge pressure for injecting and depositing porous material |
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