CN103861932B - A kind of building mortion of thermoplastic glass fiber reinforced aramid aluminiumlaminates and method - Google Patents

A kind of building mortion of thermoplastic glass fiber reinforced aramid aluminiumlaminates and method Download PDF

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Publication number
CN103861932B
CN103861932B CN201410128520.0A CN201410128520A CN103861932B CN 103861932 B CN103861932 B CN 103861932B CN 201410128520 A CN201410128520 A CN 201410128520A CN 103861932 B CN103861932 B CN 103861932B
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glass fiber
fiber reinforced
thermoplastic glass
aramid aluminiumlaminates
reinforced aramid
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CN103861932A (en
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孙光永
崔俊佳
李光耀
单业奇
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Hunan University
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Hunan University
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Abstract

The invention discloses a kind of building mortion and method of thermoplastic glass fiber reinforced aramid aluminiumlaminates, wherein this device comprises sealing pressing flange (1), discharge coil (3), coil rack (4), bolt (5, 11), lower platen (6), base (7), resistance wire (9), top board (10), hydraulic cylinder (12), wherein, bolt (5, 11) mode of welding is adopted to be connected with the bottom of top board (10), hydraulic cylinder (12) is fixed on top board (10), the working arm of hydraulic cylinder (12) passes the centre bore of top board (10) to downward-extension, working arm lower end and the sealing pressing flange (1) of hydraulic cylinder (12) are connected, and working arm is welded with stroke limit block (13), the sidewall of sealing pressing flange (1) has steam vent (8), cooldown rate when this device can carry out preheating to laminate and can control laminate cooling, thus release is due to the residual thermal stress of the shrinkage factor difference generation of plate, to prevent the cracking phenomena of interlayer.

Description

A kind of building mortion of thermoplastic glass fiber reinforced aramid aluminiumlaminates and method
Technical field
The invention belongs to metal-base composites machine-shaping field, be specifically related to a kind of manufacturing process of thermoplastic glass fiber reinforced aramid aluminiumlaminates.
Background technology
Fibreglass-reinforced metal laminate (Fibre Reinforced Metal Laminates, FRML) is a kind of special metal-base composites, adopts adhesive bonding technique alternatively laminated to form by metal alloy thin plate and fiber/resin laying.Fibre laminates have excellent combination property, and glass fiber reinforcement aramid aluminiumlaminates uses more one at present.The advantages such as the specific strength that its existing metal material is higher, specific stiffness and good plasticity, fracture property, shock resistance, remain again the fatigue performance that fibre reinforced materials is good, and quality is relatively light, meets following light-weighted developing direction.In addition, fibreglass-reinforced metal laminate also has good sound insulation and the ability of absorption of noise, effectively can reduce noise for auto industry, improves comfortableness.Glass-fiber reinforced thermoplastic (GMT) material is matrix with thermoplastic resin, take glass mat as the composite strengthening skeleton.Generally can produce sheet material semi-finished product, then directly be processed into the product of required shape.Thermoplastic glass fiber's plastics can as the enhancing base of plymetal, and there is better impact characteristics thermoplastic fibreglass-reinforced metal laminate (FML) more heat cured laminate (FML).But because traditional forming technology is as laminating technology, forming process step is more, investment is large, and efficiency is low, is not suitable for batch production.So have scholar stamping technology to be introduced the shaping of composite, but also there are some problems.During room temperature, fiber-reinforced layer plasticity is mostly poor, easily occurs the inefficacies such as brittle break, cause processing difficulties when using the method for punching press to be shaped to it; When improving temperature punching press, the resilience of plate again can be obvious.Therefore the fibreglass-reinforced metal laminate of superior performance is only applied to the high-tech sector such as Aero-Space and military project.
Electro-magnetic forming is the two-forty forming technique utilizing magnetic field force that metal stock is out of shape.Because the high energy density characteristic of electromagnetic forming technique, make the superplasticity showing explosive forming during workpiece deformation.Therefore, it can significantly improve the forming limit of metal, and shaped portion metal uniform force, and the forming defects such as not easily break.High strain-rate characteristic can make metal paste mould fast, and the springback capacity of metal is general all smaller even without resilience.So use electromagnetic forming technique and form and suitable preheating thermoplastic fiberglass reinforced metal laminate, effectively can improve fibreglass-reinforced metal laminate forming property, solve the problem of brittle break in existing forming technique, and effectively can avoid resilience, improve the dimensional accuracy of sheet material forming.This manufacturing process can also easily complete the operation such as circular cross-esction and special-shaped hole flanging, effectively raises the assembly performance of material.Although the manufacturing process being a kind of titanium alloy thin wall housing of 201310355871.0 as application for a patent for invention number solves resilience problem when thin plate plate is shaped but does not have heater can not carry out to plate the processing that preheating is not suitable for thermoplastic glass fiber reinforced aramid aluminiumlaminates; As the application for a patent for invention number magnesium alloy plate mild hot formation method that is 200910062979.4 can improve the formability of material but the efficiency of heating surface low and not evenly can not controlled cooling model time speed, so the cracking of manufacturing deficiency and interlayer can be caused when processing thermoplastic glass fiber reinforcement aramid aluminiumlaminates.
Summary of the invention
The object of the invention is, for the deficiency that prior art exists, the shaping for thermoplastic glass fiber reinforced aramid aluminiumlaminates provides a kind of building mortion and method of thermoplastic glass fiber reinforced aramid aluminiumlaminates.
Technical scheme of the present invention is to provide a kind of building mortion of thermoplastic glass fiber reinforced aramid aluminiumlaminates, it is characterized in that: comprise sealing pressing flange, discharge coil, coil rack, bolt, lower platen, base, resistance wire, top board, hydraulic cylinder, wherein, bolt adopts the mode of welding to be connected with the bottom of top board, hydraulic cylinder uses bolt to be connected and fixed on top board, the working arm of hydraulic cylinder passes the centre bore of top board to downward-extension, and working arm lower end and the sealing pressing flange of hydraulic cylinder are connected, and working arm are welded with stroke limit block; The sidewall of sealing pressing flange has steam vent;
Base is fixed in the circular groove of lower platen, for ensureing that bonding strength can be coated with one deck adhesive in groove, is also convenient to later dismounting; The depth of groove of described sealing pressing flange is greater than the distortion thickness of thermoplastic glass fiber reinforced aramid aluminiumlaminates, thus plays the double action of heated sealed and flanging;
After thermoplastic glass fiber reinforced aramid aluminiumlaminates location, opening power, utilizes resistance wire to heat thermoplastic glass fiber reinforced aramid aluminiumlaminates, until temperature stabilization is at preset temperature;
Charge to the storage capacitor of building mortion, after the voltage of storage capacitor reaches shaping voltage, discharge to discharge coil, thermoplastic glass fiber reinforced aramid aluminiumlaminates deforms under discharge coil produces the effect of electromagnetic force.
Further, present invention also offers a kind of method utilizing the building mortion of thermoplastic glass fiber reinforced aramid aluminiumlaminates to carry out material forming, it is characterized in that:
Step 1, thermoplastic glass fiber reinforced aramid aluminiumlaminates is fixed on base, then sealing pressing flange is placed in the groove of base, and with hydraulic cylinder, suitable pressure is applied to sealing pressing flange, to produce suitable pressure-pad-force to thermoplastic glass fiber reinforced aramid aluminiumlaminates;
Step 2, by sealing pressing flange resistance wire energising, homogeneous heating is carried out to thermoplastic glass fiber reinforced aramid aluminiumlaminates;
Step 3, thermoplastic glass fiber reinforced aramid aluminiumlaminates is carried out to the insulation of Preset Time and temperature, after being heated to preset temperature, thermoplastic glass fiber reinforced aramid aluminiumlaminates is carried out to the insulation of certain hour, to make each several part homogeneous heating;
Step 4, the storage capacitor of electro-magnetic forming equipment to be charged, after charging voltage reaches the shaping voltage 2-15Kv of setting, disconnect charge circuit;
Step 5, closed electromagnetic shaping discharge loop, storage capacitor discharges to electro-magnetic forming coil, and thermoplastic glass fiber reinforced aramid aluminiumlaminates deforms rapidly under the effect of electromagnetic force;
Step 6, after thermoplastic glass fiber reinforced aramid aluminiumlaminates completes distortion, controlled cooling model speed to eliminate in cooling procedure, the residual thermal stress produced because layers of material shrinkage factor is different;
Step 7, after cooling procedure completes, carry out local heat, cool at high enough pressure subsequently free margins place, opening between preventing layer is sticky.
Further, in step 1, by the effect of upper lower platen, thermoplastic glass fiber reinforced aramid aluminiumlaminates to be formed is pressed against on electro-magnetic forming coil, and ensure that discharge coil and coil rack thereof are fixed well.
Further, in step 2, described sealing pressing flange side is provided with two steam vents, to guarantee that the gas in sealing pressing flange can be discharged, and in cooling procedure with the heat exchange in the external world.
Further, in step 2, the warming temperature of the thermoplastic glass fiber reinforced aramid aluminiumlaminates described in use thermocouple detects, and make temperature stabilization in preset range.
Further, in steps of 5, described electro-magnetic forming coil and coil rack are solidified togather through insulating resin, and have good insulating properties with thermoplastic glass fiber reinforced aramid aluminiumlaminates.
Further, the thickness of thermoplastic glass fiber reinforced aramid aluminiumlaminates is 0.7 ~ 4mm.
This technology has following advantage compared with existing thermoplastic glass fiber reinforced aramid aluminiumlaminates forming technique:
1. electro-magnetic forming two-forty forming characteristic, the shearing force of interlayer in forming process can be reduced, thus cracking between reducing layer and the lateral stiffness of laminate can be improved.
2. when the two-forty forming characteristic of electro-magnetic forming can solve pre-drop stamping, the problem that springback capacity is large and have the higher accuracy of form and position than stamping.
3. need heat laminate and apply electromagnetic pressure in the process be shaped, belonging to secondary hot pressing can the dipping of reinforcing glass compo layer glass fiber bundle and the bonding of interlayer, thus strengthen the cutting performance of laminate, the mechanical performance of laminate is improved.
4. in electro-magnetic forming process, do not comprise curing exotherm reaction, greatly can shorten the cycle of shaping, production efficiency is improved greatly, be more applicable to producing in enormous quantities.
5. sealing pressing flange is except carrying out preheating to laminate, can also control cooldown rate during laminate cooling, thus fully discharge the residual thermal stress produced because plate interlayer shrinkage factor is different, to prevent the cracking of interlayer.
6. electro-hydraulic forming effectively can improve the forming limit of laminate, thus the plate that the shape that is shaped is more complicated, precision is higher, make laminate have the scope of application more widely.
Accompanying drawing explanation
Figure 1 shows that the overall schematic of electromagnetic forming device
Figure 2 shows that front view and the top view of top board;
Figure 3 shows that front view and the top view of lower platen;
Figure 4 shows that front view and the top view of sealing pressing flange;
Figure 5 shows that front view and the top view of base;
Figure 6 shows that front view and the top view of outer course groove;
Figure 7 shows that front view and the top view of thermoplastic glass fiber reinforced aramid aluminiumlaminates in embodiment 1;
Figure 8 shows that front view and the top view of thermoplastic glass fiber reinforced aramid aluminiumlaminates in embodiment 2;
Figure 9 shows that the overall schematic of the flanging forming device of embodiment 2;
Figure 10 shows that the flanging die of embodiment 2;
Figure 11 shows that the sectional view after embodiment 2 thermoplastic glass fiber reinforced aramid aluminiumlaminates flange.
Wherein:
Accompanying drawing 1 description of symbols:
1--sealing pressing flange; 2--thermoplastic glass fiber reinforced aramid aluminiumlaminates; 3--discharge coil;
4--coil rack; 5,11--bolt; 6--lower platen; 7--base; 8--steam vent; 9 resistance wires;
10--top board; 12 hydraulic cylinders; 13 stroke limit blocks;
Accompanying drawing 9 description of symbols:
1--sealing pressing flange; 2--thermoplastic glass fiber reinforced aramid aluminiumlaminates; 3--discharge coil;
4--coil rack; 5,11--bolt; 6--lower platen; 7--base; 8--steam vent; 9 resistance wires;
10--top board; 12 hydraulic cylinders; 13 stroke limit blocks; 14 flanging dies.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is elaborated.Obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the protection domain of this invention.
Research finds, compared with traditional electromagnetic forming technique, has special requirement when processing thermoplastic glass fiber reinforcement aramid aluminiumlaminates to technological parameter.Such as, add the time of insulation in man-hour, the temperature of insulation, cooling velocity, if the parameter of mould etc. select incorrect will cause wrinkling, the interlayer of laminate cracking and the defect such as fiber bending, affect the serviceability of laminate.So, a lot of influence factor to be considered when the selection of mold materials.First be the thermal coefficient of expansion of mould, if the thermal coefficient of expansion of mould is excessive will produce larger compression stress thus the stress distribution affected on laminate thickness direction at the contact surface with laminate; Next is the thermal conductivity of mould, and thermal conductivity is less can cause the thermograde on laminate thickness direction to differ greatly when heating and cooling, cause large residual thermal stress; Finally, also to consider the impact of the coefficient of friction of mould, if the resistance be subject to during the excessive laminate expanded by heating of the coefficient of friction of mould will be forced to more greatly shrink, thus produce larger residual stress.Select thermal coefficient of expansion less so final, thermal conductivity better and have the graphite jig of better lubrication.For cooldown rate, cooldown rate is too fast and the thickness of laminate is larger time can cause that the thermograde on thickness direction is excessive causes the defect such as delamination and distortion; The too little efficiency that can affect again production of temperature.And also to control temperature retention time and holding temperature when heating.So this device has good temperature control energy, the needs that different temperatures controls can be met.
As shown in Figure 1, the building mortion of a kind of thermoplastic glass fiber reinforced aramid aluminiumlaminates of the present invention, comprise rectifier, electric capacity, current-limiting resistance, discharge coil, switch, sealing pressing flange and sealing pressing flange fixture etc., wherein the resistance wire of resistance heated case is fixed on directly over thermoplastic glass fiber reinforced aramid aluminiumlaminates, improves the efficiency of heating surface and makes heating more even.This device and maximum not being both of other devices can control heating-up temperature and chilling temperature accurately.Because thermoplastic glass fiber reinforced aramid aluminiumlaminates must carry out preheating before shaping and for the cracking between preventing layer must controlled cooling model time speed.
The diameter of thermoplastic glass fiber reinforced aramid aluminiumlaminates used in the embodiment of the present invention is 30cm, and thickness is 2mm.Aluminium alloy layer plate material is wherein 2024-T3, and thickness is about 0.5mm; The matrix of fiberglass reinforced plastics is thermoplastic resin polypropylene, and the thickness of adhesive layer and fiberglass reinforced plastics layer is about 0.2mm.
As shown in Figure 1, in a first embodiment, the building mortion of thermoplastic glass fiber reinforced aramid aluminiumlaminates, comprises graphite grazing blank holder 1, discharge coil 3, coil rack 4, bolt 5,11, lower platen 6, graphite base 7, resistance wire 9, top board 10, hydraulic cylinder 12 etc.Wherein, bolt 5,11 adopts the mode of welding to be connected with the bottom of top board 10, hydraulic cylinder 12 is fixed on top board 10, the working arm of hydraulic cylinder 12 passes the centre bore of top board 10, the working arm lower end of hydraulic cylinder 12 adopts with sealing pressing flange 1 and is threaded, and working arm is welded with stroke limit block 13, to ensure the relative position of sealing pressing flange 1 and top board 10, when acting on effectively on sealing pressing flange, the reaction force of generation is born by four bolts fixing upper lower platen;
Graphite base 7 is fixed in the circular groove of lower platen 6, for ensureing that bonding strength can be coated with one deck adhesive in groove, is also convenient to later dismounting.The depth of groove of described sealing pressing flange 1 much larger than the possible distortion thickness of thermoplastic glass fiber reinforced aramid aluminiumlaminates 2, thus plays the double action of heated sealed and flanging.
In addition, the sidewall of sealing pressing flange 1 has steam vent 8, this steam vent 8, to prevent the air pressure in the process of Quick-forming in die cavity too high, produces inhibition to shaping; Can come to carry out heat exchange with controlled cooling model temperature with the external world by it when lowering the temperature.
As shown in Figure 1, base 7 is positioned in the circular groove on lower platen 6, be that the thermoplastic glass fiber reinforced aramid aluminiumlaminates 2 of 2mm is positioned in the detent of base 7 by thickness, then sealing pressing flange 1 is placed on thermoplastic glass fiber reinforced aramid aluminiumlaminates 2, and use hydraulic cylinder 12 pairs of sealing pressing flanges 1 to apply suitable pressure, with the pressure-pad-force making sealing pressing flange 1 pair of thermoplastic glass fiber reinforced aramid aluminiumlaminates 2 produce 3MPa.
After completing the fixing of thermoplastic glass fiber reinforced aramid aluminiumlaminates 2 and locating, opening power, resistance wire 9 pairs of thermoplastic glass fiber reinforced aramid aluminiumlaminates 2 are utilized to heat, until temperature stabilization is at about 160 DEG C, there are some researches show Fiberglass-reinforcepolypropylene polypropylene plastic at this temperature laminate have reasonable bating effect, shearing strength between layers can be obviously less, greatly improves formability.After being heated to 160 DEG C, also to be incubated 10min at this temperature to make thermoplastic glass fiber reinforced aramid aluminiumlaminates homogeneous heating.Meanwhile, the storage capacitor of electro-magnetic forming equipment is charged, after charging voltage reaches shaping voltage 2KV, discharge coil 3 is discharged, deform fast under the effect of the electromagnetic force that thermoplastic glass fiber reinforced aramid aluminiumlaminates 2 produces at discharge coil 3.
Sealing pressing flange 1 is not removed immediately after distortion, use resistance wire suitably to heat and make temperature in sealing pressing flange at the uniform velocity cool to room temperature in 5min by steam vent and extraneous method of carrying out heat exchange, to discharge the residual thermal stress in cooling procedure, prevent the cracking of thermoplastic glass fiber reinforced aramid aluminiumlaminates interlayer.The bulging to thermoplastic glass fiber reinforced aramid aluminiumlaminates is just completed when the temperature in sealing pressing flange 1 is reduced to room temperature.Subsequently thermoplastic glass fiber reinforced aramid aluminiumlaminates 2 is carried out to the process of localized heat.Concrete grammar is: be locally heated to 160 degrees Celsius to the free margins place of thermoplastic glass fiber reinforced aramid aluminiumlaminates 2, cool subsequently under the pressure of 3Mpa, and cool time is 2min, to prevent opening of interlayer sticky.
The second embodiment of the present invention carries out flanging forming to thermoplastic glass fiber reinforced aramid aluminiumlaminates.
In the present embodiment, thermoplastic glass fiber reinforced aramid aluminiumlaminates used, aluminium alloy layer plate material is 2024-T3, diameter is 30cm, thickness is 2mm, have diameter at the center of laminate be the matrix of its fiberglass plastic of circular hole of 8cm is thermoplastic polypropylene, and the thickness of aluminium alloy layer is about 0.5mm, and adhesive layer and glass fiber reinforced layer thickness are about 0.2mm.
As shown in Figure 9, electromagnetic forming device used in the present embodiment by sealing pressing flange 1, discharge coil 3, coil rack 4, bolt 5,11, lower platen 6, base 7, resistance wire 9, top board 10, hydraulic cylinder 12, stroke limit block 13, flanging die 14 etc.
In addition, in the present embodiment, the shape of thermoplastic glass fiber reinforced aramid aluminiumlaminates used as shown in Figure 8, base 7 is positioned in the circular groove on lower platen 6, for ensureing that bonding strength can be coated with one deck adhesive, be that the thermoplastic glass fiber reinforced aramid aluminiumlaminates 2 of 2mm is positioned in the detent of base 7 by thickness, then sealing pressing flange 1 is placed on thermoplastic glass fiber reinforced aramid aluminiumlaminates 2, and use hydraulic cylinder 12 pairs of sealing pressing flanges 1 to apply suitable pressure to make sealing pressing flange 1 pair of thermoplastic glass fiber reinforced aramid aluminiumlaminates 2 produce the pressure-pad-force of 3MPa.After completing the fixing of thermoplastic glass fiber reinforced aramid aluminiumlaminates 2 and locating, opening power, resistance wire 9 is utilized to carry out local heat through the medium pore turned over all over mould 13 to thermoplastic glass fiber reinforced aramid aluminiumlaminates 2, until the temperature stabilization in annular seal space is at about 160 DEG C, there are some researches show Fiberglass-reinforcepolypropylene polypropylene plastic at this temperature laminate have reasonable bating effect, shearing strength between layers can be obviously less, greatly improves formability.After being heated to 160 DEG C, also to be incubated 10min at this temperature to make thermoplastic glass fiber reinforced aramid aluminiumlaminates homogeneous heating.Wherein the central circular hole of flanging die has fillet, so that the shaping of thermoplastic glass fiber reinforced aramid aluminiumlaminates.Meanwhile, the storage capacitor of electro-magnetic forming equipment is charged, after charging voltage reaches shaping voltage 2KV, discharge coil 3 is discharged, material is made to paste mould rapidly under the effect of the electromagnetic force that thermoplastic glass fiber reinforced aramid aluminiumlaminates 2 produces at discharge coil 3, sealing pressing flange is not removed immediately after distortion, use resistance wire suitably to heat and make temperature in sealing pressing flange at the uniform velocity cool to room temperature in 5min by steam vent and outside method of carrying out heat exchange, to discharge the residual thermal stress in cooling procedure, the cracking between preventing layer flaggy.The shaping to thermoplastic glass fiber reinforced aramid aluminiumlaminates is just completed when the temperature in sealing pressing flange is reduced to room temperature.Shape after thermoplastic glass fiber reinforced aramid aluminiumlaminates is shaped as shown in figure 11.Free margins place carries out being locally heated to 160 degrees Celsius, cools subsequently under the pressure of 3Mpa, and cool time is 2min, to prevent opening of interlayer sticky.
In sum, the electromagnetic forming method of thermoplastic glass fiber reinforced aramid aluminiumlaminates of the present invention, specifically comprises the following steps:
Step 1, thermoplastic glass fiber reinforced aramid aluminiumlaminates is fixed on base 7, then sealing pressing flange 1 is placed in the groove of base, and apply suitable pressure, to produce suitable pressure-pad-force to thermoplastic glass fiber reinforced aramid aluminiumlaminates 2 with hydraulic cylinder 12 pairs of sealing pressing flanges 1.
Wherein, hydraulic cylinder 12 is fixed by bolts on top board 10, and the reaction force produced when acting on effectively on sealing pressing flange 1 is born by the bolt fixing top board;
In this step, the effect of described upper lower platen is to be pressed against on electro-magnetic forming coil 3 by thermoplastic glass fiber reinforced aramid aluminiumlaminates 2 to be formed, and ensures that discharge coil 3 and coil rack 4 thereof are fixed well;
In this step, described sealing pressing flange and base are provided with bead to provide enough pressure-pad-forces.
Step 2, to be energized to the resistance wire 9 in sealing pressing flange 1, to make the temperature in mould be elevated to softening temperature, homogeneous heating is carried out to thermoplastic glass fiber reinforced aramid aluminiumlaminates 2, to reach the object improving its plastic deformation performance.In thermoplastic glass fiber reinforced plymetal, this is a vital step, otherwise be shaped can unusual difference.
In this step, described sealing pressing flange side is provided with steam vent 8, to guarantee that the gas in sealing pressing flange can be discharged, in order to avoid play inhibition to the shaping of thermoplastic glass fiber reinforced aramid aluminiumlaminates.
In this step, the warming temperature of described thermoplastic glass fiber reinforced aramid aluminiumlaminates uses thermocouple to detect, and makes temperature stabilization in preset range.
In this step, described resistance wire, its overall shape is circular and is placed in directly over thermoplastic glass fiber reinforced aramid aluminiumlaminates, to improve the efficiency of heating surface and to make heating more even.
Step 3, thermoplastic glass fiber reinforced aramid aluminiumlaminates is carried out to the insulation of Preset Time and temperature.Being heated to after 160 DEG C, to be incubated laminate, heating all to make each several part.
Step 4, the storage capacitor of electro-magnetic forming equipment to be charged, after charging voltage reaches the shaping voltage 2-15Kv of setting, disconnect charge circuit;
In this step, described discharge voltage estimates according to the thickness of thermoplastic glass fiber reinforced aramid aluminiumlaminates, and test accordingly and determine be shaped time optimum discharge voltage.
Step 5, closed electromagnetic shaping discharge loop, storage capacitor discharges to electro-magnetic forming coil, and thermoplastic glass fiber reinforced aramid aluminiumlaminates, under the effect of electromagnetic force, high-speed deformation occurs.
In this step, described electro-magnetic forming process is: by closed circuit switch, make capacitor discharge, the heavy current that electric discharge produces produces induced field by coil around it, in workpiece, produce induced-current simultaneously, induced-current produces induced field at thermoplastic glass fiber reinforced aluminium alloy layer panel area again, the magnetic field force of the induced field that thermoplastic glass fiber reinforced aramid aluminiumlaminates produces and the induced field that coil produces repels mutually, and thermoplastic glass fiber reinforced aramid aluminiumlaminates, under the effect of powerful electromagnetic force, plastic deformation occurs.
In addition, in described electro-magnetic forming process, aramid aluminiumlaminates plays the effect of driving chip, and the glass fibre laminate poor to electric conductivity applies motive force, makes laminate overall generation plastic deformation under the effect of electromagnetic force.
In this step, described electro-magnetic forming coil 3 and winding wire ring framework 4 are through has insulating properties well with thermoplastic glass fiber reinforced aramid aluminiumlaminates together with high-strength insulating resin solidification.
Step 6, after thermoplastic glass fiber reinforced aramid aluminiumlaminates completes distortion, controlled cooling model speed to eliminate in cooling procedure, due to layers of material shrinkage factor difference produce residual thermal stress.
Concrete grammar uses thermocouple induction temperature, then by the firing rate of temperature controller controlling resistance silk and the flow of air, to reach the object of controlled cooling model speed.In the forming process of laminate, the control of temperature has vital impact to the quality of laminate and serviceability, so temperature controls to be quite crucial.
Step 7, after electro-magnetic forming completes, local heat is carried out to free margins place, cools at high enough pressure subsequently, to prevent opening of interlayer sticky.
The effect of free edge refers to the free boundary place at composite-material laminates, due to the Poisson coefficient of coup or stretching-shearing coefficient of coup difference of each lamina, there is the phenomenon that very large inter-laminar stress is concentrated
Because there is free edge effect on the formula that the sections side of thermoplastic glass fiber reinforced aramid aluminiumlaminates laminate, thus need cooling procedure in carry out the heating of local, thus improve the serviceability of thermoplastic glass fiber reinforced aramid aluminiumlaminates.
In the present invention, the thickness of thermoplastic glass fiber reinforced aramid aluminiumlaminates is 0.7 ~ 4mm.

Claims (9)

1. the building mortion of a thermoplastic glass fiber reinforced aramid aluminiumlaminates, it is characterized in that: comprise sealing pressing flange (1), discharge coil (3), coil rack (4), bolt (5, 11), lower platen (6), base (7), resistance wire (9), top board (10), hydraulic cylinder (12), wherein, bolt (5, 11) mode of welding is adopted to be connected with the bottom of top board (10), hydraulic cylinder (12) is fixed on top board (10), the working arm of hydraulic cylinder (12) passes the centre bore of top board (10) to downward-extension, working arm lower end and the sealing pressing flange (1) of hydraulic cylinder (12) are connected, and working arm is welded with stroke limit block (13), the sidewall of sealing pressing flange (1) has steam vent (8),
Base (7) is fixed on lower platen (6); Described sealing pressing flange (1) has groove;
After thermoplastic glass fiber reinforced aramid aluminiumlaminates (2) location, opening power, utilizes resistance wire (9) to heat, until temperature stabilization is at preset temperature thermoplastic glass fiber reinforced aramid aluminiumlaminates (2);
The storage capacitor of building mortion is charged, after storage capacitor voltage reaches shaping voltage, discharge to discharge coil (3), thermoplastic glass fiber reinforced aramid aluminiumlaminates (2) deforms under discharge coil (3) produces the effect of electromagnetic force;
Sealing pressing flange (1) is not removed after thermoplastic glass fiber reinforced aramid aluminiumlaminates (2) distortion, use resistance wire suitably to heat and carry out the method for heat exchange by steam vent (8) and the external world, making temperature in sealing pressing flange at the uniform velocity cool to room temperature in 5min.
2. the building mortion of thermoplastic glass fiber reinforced aramid aluminiumlaminates according to claim 1, it is characterized in that: be positioned in the detent of base (7) by thermoplastic glass fiber reinforced aramid aluminiumlaminates (2), sealing pressing flange (1) is placed on thermoplastic glass fiber reinforced aramid aluminiumlaminates (2).
3. the building mortion of thermoplastic glass fiber reinforced aramid aluminiumlaminates according to claim 1, it is characterized in that: when masterpiece is on sealing pressing flange, the reaction force produced is born by the bolt (5,11) fixing top board (10).
4. utilize the building mortion of thermoplastic glass fiber reinforced aramid aluminiumlaminates described in claim 1 to carry out the method for material forming, it is characterized in that:
Step 1, thermoplastic glass fiber reinforced aramid aluminiumlaminates is fixed on base (7), then sealing pressing flange (1) is placed in the groove of base, and with hydraulic cylinder (12), suitable pressure is applied to sealing pressing flange (1), to produce suitable pressure-pad-force to thermoplastic glass fiber reinforced aramid aluminiumlaminates (2);
Step 2, by sealing pressing flange (1) resistance wire (9) energising, homogeneous heating is carried out to thermoplastic glass fiber reinforced aramid aluminiumlaminates (2);
Step 3, thermoplastic glass fiber reinforced aramid aluminiumlaminates (2) is carried out to the insulation of Preset Time and temperature, after being heated to preset temperature, thermoplastic glass fiber reinforced aramid aluminiumlaminates (2) is incubated, to make each several part homogeneous heating;
Step 4, the storage capacitor of electro-magnetic forming equipment to be charged, after charging voltage reaches the shaping voltage 2-15Kv of setting, disconnect charge circuit;
Step 5, closed electromagnetic shaping discharge loop, storage capacitor discharges to discharge coil (3), and thermoplastic glass fiber reinforced aramid aluminiumlaminates (2), under the effect of electromagnetic force, high-speed deformation occurs;
Step 6, after thermoplastic glass fiber reinforced aramid aluminiumlaminates (2) completes distortion, controlled cooling model speed with eliminate in cooling procedure due to layers of material shrinkage factor difference produce residual thermal stress;
Step 7, after electro-magnetic forming completes, carry out local heat, cool at high enough pressure subsequently free margins place, opening between preventing layer is sticky.
5. method according to claim 4, it is characterized in that: in step 1, by the effect of upper lower platen, thermoplastic glass fiber reinforced aramid aluminiumlaminates (2) to be formed is pressed against on discharge coil (3), and ensures that discharge coil (3) and coil rack (4) thereof are fixed well.
6. method according to claim 4, is characterized in that: in step 2, and described sealing pressing flange (1) side is provided with steam vent (8), to guarantee that the gas in sealing pressing flange can be discharged in time.
7. method according to claim 4, is characterized in that: in step 2, the warming temperature of the thermoplastic glass fiber reinforced aramid aluminiumlaminates (2) described in use thermocouple detects, and makes temperature stabilization in preset range.
8. method according to claim 4, it is characterized in that: in steps of 5, described discharge coil (3) and coil rack (4) are solidified togather through insulating resin, and have good insulating properties with thermoplastic glass fiber reinforced aramid aluminiumlaminates.
9. method according to claim 4, is characterized in that: in step 1, and the thickness of thermoplastic glass fiber reinforced aramid aluminiumlaminates (2) is 0.7 ~ 4mm.
CN201410128520.0A 2014-04-01 2014-04-01 A kind of building mortion of thermoplastic glass fiber reinforced aramid aluminiumlaminates and method Expired - Fee Related CN103861932B (en)

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CN106893955B (en) * 2017-03-20 2019-01-22 武汉理工大学 A kind of electromagnetic forming device and the method for preparing fiber-reinforced metal matrix composite using the device
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