CN102500675B - Hot forming tool of titanium alloy thin-wall part and machining method of hot forming tool - Google Patents
Hot forming tool of titanium alloy thin-wall part and machining method of hot forming tool Download PDFInfo
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- CN102500675B CN102500675B CN2011103089437A CN201110308943A CN102500675B CN 102500675 B CN102500675 B CN 102500675B CN 2011103089437 A CN2011103089437 A CN 2011103089437A CN 201110308943 A CN201110308943 A CN 201110308943A CN 102500675 B CN102500675 B CN 102500675B
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Abstract
The invention provides a hot forming tool of a titanium alloy thin-wall part, comprising five parts, namely stretching equipment, a mould device, a blank, a power supply system and a temperature control system, wherein the mould device is arranged on a central worktable of the stretching equipment; the blank passes through a side wall crack of the mould device; an insulating and heat-insulation cushion layer is used for insulating the blank, a clamp of the stretching equipment, the surface of a mould and a tool of the mould; the power supply system is switched on to electrify an electrode clamping plate and generate a current in the blank; the blank is heated and the temperature of the blank is measured and controlled by the temperature control system; and after the temperature of the blank reaches a target temperature, the part is formed on the surface on the mould by the blank in an adhered manner through carrying out hot forming processes successively including stretching, covering, stretching, heat preservation and creep deformation and the like on the stretching equipment. A machining method of the hot forming tool of the titanium alloy thin-wall part comprises eight steps. According to the invention, the heating efficiency, the process integration, the material formation and the formation precision of the titanium alloy thin-wall part in manufacture are greatly improved, so that the hot forming tool of the titanium alloy thin-wall part and the machining method of the hot forming tool have a practical value and a popularization value.
Description
Technical field
The present invention relates to a kind of titanium alloy thin-wall part hot forming frock and processing method, the hot forming for the difficult moulding material of the normal temperature such as titanium alloy, magnesium alloy, high-strength steel, be particularly useful for the titanium alloy hot forming, belongs to technical field of hot working.
Technical background
The compatible coordination characteristic that titanium alloy material has high specific strength, high limit intensity and has the metallurgy aspect good with composite, galvanic corrosion is little, therefore, the large titanium alloy thin-wall part is the advanced lightweight efficient configuration element that aerospace field is high temperature resistant, the long-life requires preferential employing, but its Accurate Shaping difficulty is large, process is complicated, usually adopts hot forming.If adopt traditional blank heating method, as flame heating, blowtorch heating, heating furnace heating blank etc., the radiating rate of thin-wall part is fast, non-uniform temperature, and forming quality is unstable; Adopt the mold integral heating to be about to mould and put into inside heating furnace heated together with blank, can improve forming quality, still, generally, the mould volume is much larger than the volume of thin-walled blank to be formed, and the heats of the overwhelming majority have been added on mould.According to estimates, in hot forming, the heat exhaustion that surpasses 80% is arranged on the non-molded components such as mould, blank holder, body of heater; For superplastic forming, these data reach 95%, and therefore, in traditional heat forming technology, the effective rate of utilization of heat is very low, has caused great energy waste.And in the heating process of traditional heat forming technology, the mode that mould and blank receive heat is mainly heat radiation and heat conduction, the heat transmission speed is slow, mould being put into together with blank to inside heating furnace as employing is heated, the body of heater heating rate is at 100～150 ℃/h, heat time heating time is long, and according to the technique difference, heat time heating time is generally at 1～n (n ﹥ 1) hour, therefore the thermal efficiency of this heating means is low, production efficiency is also very low, is difficult to adapt to the growth requirement of titanium alloy thin-wall part small lot, fast production.
Summary of the invention
1, purpose: the present invention seeks in order to solve when thin-wall workpiece is carried out to hot forming, as only heated blank, the forming quality of sheet member is poor; As heated together with mould, heat utilization ratio is low, has wasted a large amount of energy; As it is long in the high temperature retention time to heat blank, the problem that oxidation aggravates, and a kind of titanium alloy thin-wall part hot forming frock and processing method are provided.It is hot forming frock and the manufacturing process of a kind of energising from resistance heating stretch forming titanium alloy thin-wall part.
2, technical scheme:
(1) a kind of titanium alloy thin-wall part hot forming of the present invention frock, it is by stretcher, die device, blank, five parts of power-supply system and temperature control system form, position annexation between them is: die device is placed on the central workbench of stretcher, sidewall crack by blank through die device, adopt adiabatic insulating blanket to make blank and stretcher clamp, die surface and frock insulation thereof, open power-supply system, give the energising of electrode clamping plate, generation current in blank, the heating blank, the dependence temperature control system is measured, control blank temperature, after blank reaches target temperature, stretcher by stretching-coat-heat forming technologies such as stretch-insulation creep make the blank laminating die surface qualified parts that are shaped.
1) stretcher, as the well-known a kind of former of aircraft industry, generally be divided into stretching machine, stretching former, stretch benders, described stretcher is vertical structure 100 ton numerical control stretching-machines, by lathe bed, swing arm, clamp and workbench, formed, the lathe bed left-right symmetry, workbench is at the lathe bed middle position, respectively there is the guide rail of pair of parallel the lathe bed both sides, by slide block, lathe bed, swing arm are linked together, swing arm is the main movement mechanism of stretching-machine, and the motion mode such as can realize that prestretched, bending, benefit are drawn is realized titanium alloy thin-wall part is shaped.
2) die device, specifically comprise: upper incubator, lower incubator, mould, mould pad block, insulating pad, backing plate, position annexation between them is: mould, mould pad block, insulating pad and backing plate are placed in lower incubator successively from top to bottom, upper incubator and lower incubator are connected and fixed by bolt nut structure, in utilization the carriage of the handle of incubator and lower incubator can open, the close die device; Above incubator adopts the rectangular hollow shell structure, two-layer inside and outside minute, the outer upper incubator shell for the heat-resisting steel sheet and plate making, play the effect of fixed support heat-insulation layer, internal layer is heat-insulation layer, and material is the vacuum fiber, main component is alundum (Al2O3), plays thermal insulation function; Wherein, should comprise by upper incubator: upper incubator shell, upper haybox cooking layer, upper haybox cooking layer fixed head, sliding-rail groove, handle, locator, close therebetween and be: upper haybox cooking layer fixed head stands upright between incubator shell and upper haybox cooking layer, sliding-rail groove is arranged on the incubator surrounding and is connected with upper incubator shell, locator is positioned at both sides, incubator shell middle part, for loosen, tighten the sidewall that can slide in upper incubator in sliding-rail groove; Handle is positioned at incubator shell anteriomedial position; Should upper incubator shell be metal cabinet formula structure; Should upper haybox cooking layer be rectangular solid vacuum fiber, play insulation effect; Should upper haybox cooking layer fixed head be metal L shaped plate material; This sliding-rail groove is the metallic channel steel construction; This handle is the handle that the U-shaped steel plate is made, for incubator on unlatching, closure; This time incubator comprises: lower haybox cooking layer, lower haybox cooking layer fixed head, lower incubator shell, spring, vertical columns, side shield, insulating blanket, mould, mould pad block, insulating pad, backing plate, mold heated hole, peep hole, sliding-rail groove, carriage; Its position annexation is: mould, mould pad block, insulating pad, backing plate are placed in lower incubator shell successively from top to bottom, the mold heated hole is arranged on mould and can inserts electrically heated rod, peep hole is arranged on lower incubator shell, sliding-rail groove is arranged on lower incubator surrounding and is connected with lower incubator shell, spring, vertical columns are between lower incubator shell and side shield and be clipped in the middle of lower haybox cooking layer fixed head and backing plate, and carriage and lower incubator shell are connected; This time haybox cooking layer is rectangular solid vacuum fiber, plays insulation effect; This time haybox cooking layer fixed head is the metal concave plate; This time incubator shell is metal cabinet formula structure; This spring is commercial stage clip; This vertical columns is cylindrical structural; This side shield is the metal rectangular plate; This insulating blanket is the electric insulation of realizing blank and stretcher, die device.This mould is the single-curvature stretching die, and die surface is blank working face used need homemade metal pattern by drawing and technique while being shaped; This mould pad block is rectangular structure, and cast steel, for alleviating construction weight, offers lightening hole, plays the supporting mould effect; This insulating pad is the entity bakelite, makes mould and the insulation of lower incubator; This backing plate is the rectangular solid heat-resisting steel sheet and plate, plays fixing lower incubator, mould element; This sliding-rail groove is the metallic channel steel construction; This carriage is the metal angle structure.Upper and lower incubator is pressed shown in Fig. 4, by bolt nut structure, be connected and fixed, utilize that handle, carriage can be opened, the close die device, see Fig. 3, Fig. 6, realize putting into blank or taking out formation of parts, insulating pad isolation mould and lower incubator, realize electric insulation, electrically heated rod can be inserted in the mold heated hole, according to actual needs, determines whether to switch on heating mould.
3) blank, the titanium alloy thin wall blank that is shaped used, can be the thin-walled blanks such as titanium alloy plate, section bar, at described fixture system, can switch on from the resistance heating.
4) power-supply system, overall power 36KW comprises: the 380V power supply is connected on transformer, becomes low pressure, then, by wire connection transformer output and electrode clamping plate, by gauge tap, gives blank switching electricity.
5) temperature control system comprises: the thermocouple measurement blank temperature, and according to temperature feedback signal, adopt PLC single-chip microcomputer closed-loop control source current, and then control blank temperature, in whole forming period, temperature control system is that automatic programmed is controlled.
Working procedure of the present invention is as follows: die device is placed on the workbench of stretcher central authorities, sidewall crack by blank through die device, adopt the insulation and thermal insulation bed course to make blank and stretcher clamp, die surface and frock insulation thereof, open power-supply system, give the energising of electrode clamping plate, generation current in blank, the heating blank, rely on temperature control system to measure, control blank temperature, after blank reaches target temperature, stretcher by stretching-coat-heat forming technologies such as stretch-insulation creep make the blank laminating die surface qualified parts that are shaped.
Wherein, when described blank is sheet material, stretcher is the numerical controlled stretch forming machine; When blank is section bar, stretcher is the stretch bending machine.
Wherein, described insulating blanket is the materials such as asbestos cloth, mica sheet, ceramic fiber blanket or asbestos packing sheet;
Wherein, the running parameter of described power-supply system is: voltage is that 3V～36V, electric current are 500A～5000A;
Wherein, the temperature of described temperature control system control blank is 600 ℃～750 ℃;
Wherein, the model specification of described spring is 2 * 20D1 * 160;
Wherein, the material of described mould is Ni7N.
(2) processing method of a kind of titanium alloy thin-wall part hot forming of the present invention frock, the method concrete steps are as follows:
After step 5, prestretched reach prestrain, on the workbench driven mold device of stretcher, move, under 600 ℃～750 ℃ of target temperatures with strain rate 1.0*10
-2～1.0*10
-4/ s coats shaping to blank, until the mould of fitting fully;
After step 6, blank laminating mould, under 600 ℃～750 ℃ of target temperatures with strain rate 1.0*10
-2～1.0*10
-4/ s mends and draws blank, until whole range of strain is 0.1～8%;
Described a kind of titanium alloy thin-wall part hot forming frock, when this blank is sheet material, stretcher is the numerical controlled stretch forming machine; When blank is section bar, stretcher is the stretch bending machine.
3, advantage and effect: the present invention compares with conventional art, advantage is: due to blank is switched on, cause heating effect of current based on blank resistance, directly heat blank and blank temperature is remained in the hot forming temperature range, then draw, be incubated the creep forming blank in stretcher prestretched, coating, benefit, make blank laminating mould, viscoplastic deformations occurs.This frock has not only avoided monoblock type in traditional hot forming, superplasticforming to add the thermal loss of heat loss on other parts such as mould, and make that heating process is very fast, the blank internal temperature is very even, greatly improved utilization rate and the efficiency of heating surface of energy, oxidation reduction.In addition, blank heating forms after target temperature, temperature-resistant, and uniformity of temperature profile, is conducive to the viscoplastic deformations of blank, improves product quality.
The accompanying drawing explanation
Fig. 1 is a kind of titanium alloy thin-wall part hot forming fixture system schematic diagram.
Fig. 2 is frock mould therefor device front view of the present invention.
Fig. 3 is frock mould therefor device closure state side view of the present invention.
Fig. 4 is frock mould therefor device A-A cutaway view of the present invention.
Fig. 5 is frock mould therefor device B-B cutaway view of the present invention.
Fig. 6 is frock mould therefor device opening side view of the present invention.
Fig. 7 is the frock mould therefor device front view of the present invention while finishing that is shaped.
In figure, symbol description is as follows:
1 power-supply system; 2 stretchers; 3 die devices; 4 electrode clamping plate;
5 thermocouples; 6 temperature control systems; 7 clamps; 8 insulating blankets;
9 blanks; 10 moulds; Incubator on 11; 12 backing plates;
13 Die Box sidewall cracks; Incubator shell on 14; Haybox cooking layer on 15; Haybox cooking layer on 16
Fixed head; 17 bolt nut structures; 18 times haybox cooking layers; 19 times haybox cooking layer fixed heads;
20 springs; 21 vertical columns; 22 side shields; 23 mould pad blocks;
24 insulating pads; 25 mold heated holes; 26 peep holes; 27 times incubators;
28 times incubator shells; 29 sliding-rail grooves; 30 swing arms; 31 lathe beds;
32 workbench; 33 handles; 34 carriages; 35 guide rails;
36 slide blocks; 37 formation of parts; 38 wires; 39 locators;
The A-A:A-A cutaway view; The B-B:B-B cutaway view; C: open D: closure
The specific embodiment
Below in conjunction with accompanying drawing 1～Fig. 7, technical scheme of the present invention is described further.
(1) a kind of titanium alloy thin-wall part hot forming of the present invention frock, it is by stretcher 2, die device 3, blank 9, 6 five parts of power-supply system 1 and temperature control system form, position annexation between them is: die device 3 is placed on the central workbench 32 of stretcher 2, sidewall crack 13 by blank 9 through die device 3, adopt insulation and thermal insulation bed course 8 to make the clamp 7 of blank 9 and stretcher 2, mould 10 surfaces and frock insulation thereof, open power-supply system 1, give the electrode clamping plate 4 energisings, at the interior generation current of blank 9, heating blank 9, rely on temperature control system 6 to measure, control the temperature of blank 9, after blank 9 reaches target temperature, stretcher 2 makes blank 9 laminating mould 10 shaping surfaces go out qualified parts by heat forming technologies such as the creeps that stretches-coat-stretch-be incubated.
A kind of titanium alloy thin-wall part hot forming of the present invention frock comprises five parts:
1) stretcher 2, as the well-known a kind of former of aircraft industry, generally be divided into stretching machine, stretching former, stretch benders, described stretcher is vertical structure 100 ton numerical control stretching-machines, by lathe bed 31, swing arm 30, clamp 7 and workbench 32 form, lathe bed 31 left-right symmetry, workbench 32 is at lathe bed 31 middle positions, respectively there is the guide rail 35 of pair of parallel lathe bed 31 both sides, make lathe bed 31 by slide block 36, swing arm 30 links together, swing arm 30 is main movement mechanisms of stretching-machine, can realize prestretched, crooked, benefit such as draws at the motion mode, realization is shaped to titanium alloy thin-wall part.
2) die device 3, specifically comprise: upper incubator 11, lower incubator 27, mould 10 and mould pad block 23 thereof, insulating pad 24, backing plate 12, position annexation between them is: mould 10, mould pad block 23, insulating pad 24 and backing plate 12 are placed in lower incubator 27 successively from top to bottom, upper incubator 11 and lower incubator 27 are connected and fixed by bolt nut structure 17, in utilization the carriage 34 of the handle 33 of incubator and lower incubator can open, close die device 3; Should adopt the rectangular hollow shell structure by upper incubator 11, two-layer inside and outside minute, skin is upper incubator shell 14, play 15 effects of fixed support heat-insulation layer, internal layer is upper haybox cooking layer 15, and material is the vacuum fiber, main component is alundum (Al2O3), plays thermal insulation function; This time incubator 27 adopts the rectangular hollow shell structure, two-layer inside and outside minute, skin is lower incubator shell 28, play the effect of fixed support heat-insulation layer, internal layer is lower haybox cooking layer 18, and material is the vacuum fiber, main component is alundum (Al2O3), play thermal insulation function, in lower incubator 27 inside, be shaped mould element insulating blanket 8, mould 10, mould pad block 23, insulating pad 24 used are housed; This insulating blanket 8 is asbestos cloths; This mould 10 is single-curvature drawing dies, and material is Ni7N, and die surface is blank working face used while being shaped; These mould pad block 23 materials are cast steel, for alleviating construction weight, offer lightening hole, play supporting mould 10 effects; This insulating pad 24 is entity bakelites, makes mould 10 and 27 insulation of lower incubator; This backing plate 12 is rectangular solid heat-resisting steel sheet and plates, plays fixing lower incubator and mould element.Wherein, upper incubator 11 comprises: upper incubator shell 14, upper haybox cooking layer 15, upper haybox cooking layer fixed head 16, sliding-rail groove 29, handle 33, locator 39, close therebetween and be: upper haybox cooking layer fixed head 16 stands upright between incubator shell 14 and upper haybox cooking layer 15, sliding-rail groove 29 is arranged on incubator 11 surroundings and is connected with upper incubator shell 14, locator 39 is positioned at incubator shell 14 both sides, middle part, can be at the sidewall of 29 li slips of sliding-rail groove in upper incubator for loosening, tighten; Handle 33 is positioned at incubator shell 14 anteriomedial positions; Should upper incubator shell 14 be metal cabinet formula structures; Should upper haybox cooking layer 15 be rectangular solid vacuum fibers, play insulation effect; Should upper haybox cooking layer fixed head 16 be metal L shaped plate material; This sliding-rail groove 29 is metallic channel steel constructions; This handle 33 is handles that the U-shaped steel plate is made, for incubator on unlatching, closure; Lower incubator 27 comprises: lower haybox cooking layer 18, lower haybox cooking layer fixed head 19, lower incubator shell 28, spring 20, vertical columns 21, side shield 22, insulating blanket 8, mould 10, mould pad block 23, insulating pad 24, backing plate 12, mold heated hole 25, peep hole 26, sliding-rail groove 29, carriage 34; Its position annexation is: mould 10, mould pad block 23, insulating pad 24, backing plate 12 are placed in lower incubator shell 28 successively from top to bottom, mold heated hole 25 is arranged on mould 10, peep hole 26 is arranged on lower incubator shell 28, sliding-rail groove 29 is arranged on lower incubator 27 surroundings and is connected with lower incubator shell 28, spring 20, vertical columns 21 are between lower incubator shell 28 and side shield 22 and be clipped in lower haybox cooking layer fixed head 19 and backing plate 12 centres, and carriage 34 is connected with lower incubator shell 28; This time haybox cooking layer 18 is rectangular solid vacuum fibers, plays insulation effect; This time haybox cooking layer fixed head 19 is metal concave plates; This time incubator shell 28 is metal cabinet formula structures; This spring 20 is stage clip, model specification: 2 * 20D1 * 160GB2089-80; This vertical columns 21 is cylindrical structurals; This side shield 22 is metal rectangular plates; This insulating blanket 8 is electric insulations of realizing blank 9 and stretcher 2, die device 3; This mould 10 is to need homemade metal pattern by drawing and technique; This mould pad block 23 is cast steel materials, for alleviating construction weight, offers lightening hole, plays the supporting mould effect; This insulating pad 24 is entity bakelites, makes mould and the insulation of lower incubator; This backing plate 12 is rectangular solid heat-resisting steel sheet and plates, plays fixing lower incubator, mould element; This sliding-rail groove 29 is metallic channel steel constructions; This carriage 34 is metal angle structures.Upper and lower incubator is pressed shown in Fig. 4, by bolt nut structure 17, be connected and fixed, utilize handle 33, carriage 34 can open C, closed D die device 3, see Fig. 3, Fig. 6, realize putting into blank 9 or taking out formation of parts 37, insulating pad 24 isolation mould and lower incubators, realize electric insulation, the electrically heated rod (not shown) can be inserted in mold heated hole 25, according to actual needs, determines whether to switch on heating mould 10.
3) blank 9, and the titanium alloy thin wall blank that is shaped used can be the thin-walled blanks such as titanium alloy plate, section bar, at described fixture system, can switch on from the resistance heating.
4) power-supply system 1, and overall power 36KW comprises: the 380V power supply is connected on the transformer (not shown), becomes low pressure, then, by wire 38 connection transformer outputs and electrode clamping plate, by gauge tap, gives blank 9 switching electricity.
5) temperature control system 6, comprising: thermocouple 5 is measured blank 9 temperature, according to temperature feedback signal, adopts PLC single-chip microcomputer closed-loop control power supply 1 electric current, and then controls blank 9 temperature, and in whole forming period, temperature control system 6 is that automatic programmed is controlled.
Working procedure of the present invention is as follows: die device 3 is placed on the workbench 32 of stretcher 2 central authorities, sidewall crack 13 by blank 9 through die device, adopt insulation and thermal insulation bed course 8 to make the clamp 7 of blank 9 and stretcher 2, mould 10 surfaces and die device 3 insulation thereof, open power-supply system 1, give the electrode clamping plate 4 energisings, at the interior generation current of blank 9, heating blank 9, rely on thermocouple 5 to measure, temperature control system 6 is controlled the temperature of blank 9, after blank 9 reaches target temperature, stretcher 2 makes blank laminating mould 10 shaping surfaces go out part 37 by heat forming technologies such as the creeps that stretches-coat-stretch-be incubated.
(2) processing method of a kind of titanium alloy thin-wall part hot forming of the present invention frock, the method concrete steps are as follows:
After step 5, prestretched reach prestrain, on the workbench 32 driven mold devices 3 of stretcher 2, move, under 600 ℃～750 ℃ of target temperatures with strain rate 1.0*10
-2～1.0*10
-4/ s coats shaping to blank 9, until the mould 10 of fitting fully;
After step 6, blank 9 laminating moulds 10, under 600 ℃～750 ℃ of target temperatures with strain rate 1.0*10
-2～1.0*10
-4/ s mends and draws blank 9, until whole range of strain is 0.1～8%;
Described a kind of titanium alloy thin-wall part hot forming frock is characterized in that, when described blank 9 is sheet material, stretcher 2 is numerical controlled stretch forming machines; When blank 9 is section bar, stretcher 2 is stretch bending machines.
Claims (8)
1. a titanium alloy thin-wall part hot forming frock, it is characterized in that: it is by stretcher, die device, blank, five parts of power-supply system and temperature control system form, die device is placed on the central workbench of stretcher, blank is through the sidewall crack of die device, adopt the insulation and thermal insulation bed course to make blank and stretcher clamp, die surface and frock insulation thereof, open power-supply system, give the energising of electrode clamping plate, generation current in blank, the heating blank, the dependence temperature control system is measured, control blank temperature, after blank reaches target temperature, stretcher by stretching-coat-stretch-insulation creep heat forming technology makes the blank laminating die surface qualified parts that are shaped,
Described stretcher is vertical structure 100 ton numerical control stretching-machines, and it can realize prestretched, bending, benefit roping flowing mode, realizes titanium alloy thin-wall part is shaped;
Described die device, specifically comprise: upper incubator, lower incubator, mould, mould pad block, insulating pad and backing plate, mould, mould pad block, insulating pad and backing plate are placed in lower incubator successively from top to bottom, upper incubator and lower incubator are connected and fixed by bolt nut structure, in utilization the carriage of the handle of incubator and lower incubator can open, the close die device; Above incubator adopts the rectangular hollow shell structure, two-layer inside and outside minute, and the outer upper incubator shell for the heat-resisting steel sheet and plate making, play the effect of fixed support heat-insulation layer, and internal layer is heat-insulation layer, and material is the vacuum fiber, and composition is alundum (Al2O3), plays thermal insulation function; Should comprise by upper incubator: upper incubator shell, upper haybox cooking layer, upper haybox cooking layer fixed head, sliding-rail groove, handle and locator, upper haybox cooking layer fixed head stands upright between incubator shell and upper haybox cooking layer, sliding-rail groove is arranged on the incubator surrounding and is connected with upper incubator shell, locator is positioned at both sides, incubator shell middle part, for loosen, tighten the sidewall that can slide in upper incubator in sliding-rail groove; Handle is positioned at incubator shell anteriomedial position; Should upper incubator shell be metal cabinet formula structure; Should upper haybox cooking layer be rectangular solid vacuum fiber, play insulation effect; Should upper haybox cooking layer fixed head be metal L shaped plate material; This sliding-rail groove is the metallic channel steel construction; This handle is the handle that the U-shaped steel plate is made, for incubator on unlatching, closure; This time incubator adopts the rectangular hollow shell structure, two-layer inside and outside minute, and the outer lower incubator shell for the heat-resisting steel sheet and plate making, play the effect of fixed support heat-insulation layer, and internal layer is heat-insulation layer, and material is the vacuum fiber, and composition is alundum (Al2O3), plays thermal insulation function; This time incubator comprises: lower haybox cooking layer, lower haybox cooking layer fixed head, lower incubator shell, spring, vertical columns, side shield, insulating blanket, mould, mould pad block, insulating pad, backing plate, mold heated hole, peep hole, sliding-rail groove and carriage; Mould, mould pad block, insulating pad, backing plate are placed in lower incubator shell successively from top to bottom, the mold heated hole is arranged on mould and can inserts electrically heated rod, peep hole is arranged on lower incubator shell, sliding-rail groove is arranged on lower incubator surrounding and is connected with lower incubator shell, spring, vertical columns are between lower incubator shell and side shield and be clipped in the middle of lower haybox cooking layer fixed head and backing plate, and carriage and lower incubator shell are connected; This time haybox cooking layer is rectangular solid vacuum fiber, plays insulation effect; This time haybox cooking layer fixed head is the metal concave plate; This time incubator shell is metal cabinet formula structure; This spring is commercial stage clip; This vertical columns is cylindrical structural; This side shield is the metal rectangular plate; This insulating blanket is the electric insulation of realizing blank and stretcher, die device; This mould is the single-curvature stretching die, and it is to need homemade metal pattern by drawing and technique, and die surface is blank working face used while being shaped; This mould pad block is rectangular structure, and cast steel, for alleviating construction weight, offers lightening hole, plays the supporting mould effect; This insulating pad is the entity bakelite, makes mould and the insulation of lower incubator; This backing plate is the rectangular solid heat-resisting steel sheet and plate, plays fixing lower incubator, mould element; This sliding-rail groove is the metallic channel steel construction; This carriage is the metal angle structure;
Described blank, the titanium alloy thin wall blank that is shaped used, it is titanium alloy plate, section bar thin-walled blank, in this fixture for forming, energising is from the resistance heating;
Described power-supply system, overall power 36KW comprises: the 380V power supply is connected on transformer, becomes low pressure, then, by wire connection transformer output and electrode clamping plate, by gauge tap, gives blank switching electricity;
Described temperature control system comprises: the thermocouple measurement blank temperature, and according to temperature feedback signal, adopt PLC single-chip microcomputer closed-loop control source current, and then control blank temperature, in whole forming period, temperature control system is that automatic programmed is controlled.
2. the processing method of a titanium alloy thin-wall part hot forming frock, it is characterized in that: the method concrete steps are as follows:
Step 1, die device is positioned on the workbench of stretch forming apparatus, insulating blanket is placed on to isolated insulation blank in the clamp of stretcher;
Step 2, electrode holder board clamping blank, the system that switches on power, give the energising of electrode clamping plate, and generation current, make blank heating;
Step 3, measure in real time the temperature of blank by thermocouple, and adjust in real time the output voltage of power-supply system, make the rate of heat addition of blank reach 5～25 ℃/s, now, the voltage and current parameter of power-supply system output is respectively: voltage is that 3V～36V, electric current are 500A～5000A;
Step 4, when the temperature of blank reaches 600 ℃～750 ℃ of target temperatures, at this temperature, the clamp of stretcher clamps blank, with strain rate 1.0*10
-2～1.0*10
-4/ s carries out prestretched, until the prestrain scope is 0.1～4%;
After step 5, prestretched reach prestrain, on the workbench driven mold device of stretcher, move, under 600 ℃～750 ℃ of target temperatures with strain rate 1.0*10
-2～1.0*10
-4/ s coats shaping to blank, until the mould of fitting fully;
After step 6, blank laminating mould, under 600 ℃～750 ℃ of target temperatures with strain rate 1.0*10
-2～1.0*10
-4/ s mends and draws blank, until whole range of strain is 0.1～8%;
Step 7, blank are pasting mould, are keeping, under target temperature, whole strained condition, being incubated 5～100Min, make the inner stress relaxation that occurs of blank, realize creep forming;
Step 8, the system of cutting off the electricity supply, stop, to the blank power supply, taking off after cooling formation of parts, process finishing.
3. a kind of titanium alloy thin-wall part hot forming frock according to claim 1, it is characterized in that: when described blank is sheet material, stretcher is the numerical controlled stretch forming machine; When blank is section bar, stretcher is the stretch bending machine.
4. a kind of titanium alloy thin-wall part hot forming frock according to claim 1, it is characterized in that: described insulating blanket is asbestos cloth, mica sheet, ceramic fiber blanket, asbestos rubber plate material.
5. a kind of titanium alloy thin-wall part hot forming frock according to claim 1, it is characterized in that: the running parameter of described power-supply system is: voltage is that 3V～36V, electric current are 500A～5000A.
6. a kind of titanium alloy thin-wall part hot forming frock according to claim 1 is characterized in that: the temperature that described temperature control system is controlled blank is 600 ℃～750 ℃.
7. a kind of titanium alloy thin-wall part hot forming frock according to claim 1, it is characterized in that: the model specification of described spring is 2 * 20D1 * 160.
8. a kind of titanium alloy thin-wall part hot forming frock according to claim 1, it is characterized in that: the material of described mould is Ni7N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103089437A CN102500675B (en) | 2011-10-13 | 2011-10-13 | Hot forming tool of titanium alloy thin-wall part and machining method of hot forming tool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103089437A CN102500675B (en) | 2011-10-13 | 2011-10-13 | Hot forming tool of titanium alloy thin-wall part and machining method of hot forming tool |
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| Publication Number | Publication Date |
|---|---|
| CN102500675A CN102500675A (en) | 2012-06-20 |
| CN102500675B true CN102500675B (en) | 2013-12-04 |
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| CN2011103089437A Active CN102500675B (en) | 2011-10-13 | 2011-10-13 | Hot forming tool of titanium alloy thin-wall part and machining method of hot forming tool |
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