CN102500675A - 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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- CN102500675A CN102500675A CN2011103089437A CN201110308943A CN102500675A CN 102500675 A CN102500675 A CN 102500675A CN 2011103089437 A CN2011103089437 A CN 2011103089437A CN 201110308943 A CN201110308943 A CN 201110308943A CN 102500675 A CN102500675 A CN 102500675A
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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, be used for the hot forming of the difficult moulding material of normal temperature such as titanium alloy, magnesium alloy, high-strength steel, be particularly useful for the titanium alloy hot forming, belong to technical field of hot working.
Technical background
Titanium alloy material has high specific strength, high limit intensity and has the compatible coordination characteristic with the good metallurgy aspect of 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 big, process is complicated, adopts hot forming usually.If adopt traditional blank heating method, like flame heat, blowtorch heating, heating furnace heating blank etc., then 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 together with blank and heat, can improve forming quality, still, generally speaking, the mould volume is much larger than the volume of thin-walled blank to be formed, and most heats have been added on the mould.According to estimates, in hot forming, have to surpass 80% heat exhaustion on non-molded components such as mould, blank holder, body of heater; For superplastic forming, these data then reach 95%, and therefore, in the traditional hot forming technology, the effective rate of utilization of heat is very low, has caused great energy waste.And in the heating process of traditional hot forming technology, the mode that mould and blank receive heat mainly is heat radiation and heat conduction, and the heat transmission speed is slow; Mould and blank are put into inside heating furnace together heat as adopting; Then the body of heater heating rate is at 100～150 ℃/h, and heat time heating time is long, and different according to technology; Heat time heating time is generally at 1～n (n＞1) hour; Therefore the thermal efficiency of this heating means is low, and 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 titanium alloy thin wall spare carried out hot forming, as only heating blank, then the forming quality of sheet member is poor; As heating together with mould, then 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 of oxidation aggravation then, and a kind of titanium alloy thin wall part hot forming frock and processing method are provided.It is that a kind of energising is from the hot forming frock and the manufacturing process that hinder heat drawing shaping titanium alloy thin wall part.
2, technical scheme:
(1) a kind of titanium alloy thin wall part of the present invention hot forming frock; It is made up of stretcher, die device, blank, power-supply system and five parts of temperature control system, and the position annexation between them is: die device is placed on the central workbench of stretcher, blank is passed the sidewall crack of 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, in blank, produce electric current; The heating blank; Rely on that temperature control system is measured, the control blank temperature, treat that blank reaches target temperature after, stretcher makes the blank applying die surface qualified parts that are shaped through stretching-coating-stretching-heat forming technologies such as insulation creep.
1) stretcher as the well-known a kind of former of aircraft industry, generally is divided into stretching machine, stretching former, stretch benders; Said stretcher is vertical structure 100 tonnage control stretching-machines, is made up of the lathe bed left-right symmetric lathe bed, swing arm, clamp and workbench; Workbench is at the lathe bed middle position; Respectively there is the guide rail of pair of parallel the lathe bed both sides, through slide block lathe bed, swing arm are linked together, and swing arm is the main motion of stretching-machine; Motion mode such as can realize that prestretched, bending, benefit are drawn is realized the titanium alloy thin wall part forming.
2) die device; Specifically comprise: go up incubator, following incubator, mould, mould cushion block, insulating pad, backing plate; Position annexation between them is: mould, mould cushion block, insulating pad and backing plate are placed on down in the incubator successively from top to bottom; Last incubator and following incubator are connected fixing through bolt nut structure, in the utilization carriage of the handle of incubator and following incubator can open, the close die device; Should go up incubator and adopt the rectangular hollow shell structure, two-layer inside and outside the branch, outer last incubator shell for the heat-resisting steel sheet and plate making; Play the effect of fixed support heat-insulation layer, internal layer is a heat-insulation layer, and material is the vacuum fiber; Main component is an alundum (Al, plays the heat-insulation and heat-preservation effect; Wherein, Should go up incubator comprises: go up the incubator shell, go up the haybox cooking layer, go up haybox cooking layer fixed head, sliding-rail groove, handle, locator; Relation is therebetween: go up haybox cooking layer fixed head and stand upright between incubator shell and the last haybox cooking layer; Sliding-rail groove is arranged on around the incubator and with last incubator shell and is connected, and locator is positioned at both sides, incubator shell middle part, is used to loosen, tighten the sidewall that can in sliding-rail groove, slide in the incubator; Handle is positioned at incubator shell anteriomedial position; Should go up the incubator shell is metal cabinet formula structure; Should go up the haybox cooking layer is rectangular solid vacuum fiber, plays insulation effect; Should go up haybox cooking layer fixed head is 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, and is used for incubator on unlatching, the closure; This time incubator comprises: following haybox cooking layer, following haybox cooking layer fixed head, following incubator shell, spring, vertical columns, side shield, insulating blanket, mould, mould cushion block, insulating pad, backing plate, mold heated hole, peep hole, sliding-rail groove, carriage; Its position annexation is: mould, mould cushion block, insulating pad, backing plate are placed on down in the incubator shell successively from top to bottom; The mold heated hole is arranged on the mould and can inserts electrically heated rod; Peep hole is arranged on down on the incubator shell; Sliding-rail groove is arranged on down around the incubator and with following incubator shell and is connected, and spring, vertical columns are in the middle of playing between incubator shell and the side shield and being clipped in following haybox cooking layer fixed head and backing plate, and carriage is connected with following incubator shell; This time haybox cooking layer is a rectangular solid vacuum fiber, plays insulation effect; This time haybox cooking layer fixed head is the metal concave plate; This time incubator shell is a metal cabinet formula structure; This spring is commercial stage clip; This vertical columns is a cylindrical structural; This side shield is the metal rectangular plate; This insulating blanket is an electric insulation of realizing blank and stretcher, die device.This mould is the single-curvature stretching die, and die surface is blank used working face and by drawing and the homemade metal pattern of arts demand when being shaped; This mould cushion block is a 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 following incubator insulation; This backing plate is the rectangular solid heat-resisting steel sheet and plate, plays fixing incubator, mould element down; This sliding-rail groove is the metallic channel steel construction; This carriage is the metal angle structure.Upper and lower incubator is by shown in Figure 4, connects fixingly through bolt nut structure, utilizes 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 that insulating pad is isolated mould and following 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 used titanium alloy thin wall blank that is shaped can be thin-walled blanks such as titanium alloy plate, section bar, at said fixture system, can switch on from the resistance heating.
4) power-supply system, overall power 36KW comprises: the 380V power supply is connected on the transformer, becomes low pressure, connects transformer output and electrode clamping plate by lead again, through gauge tap, gives the blank switching.
5) temperature control system comprises: the thermocouple measurement blank temperature, according to temperature feedback signal, adopt PLC single-chip microcomputer closed-loop control source current, and then the control blank temperature, temperature control system is automatic programmed control in whole forming period.
Working procedure of the present invention is following: die device is placed on the workbench of stretcher central authorities; Blank is passed the sidewall crack of die device, adopt the insulation and thermal insulation bed course that blank and stretcher clamp, die surface and frock thereof are insulated, open power-supply system; Give the energising of electrode clamping plate; In blank, produce electric current, the heating blank relies on temperature control system to measure, control blank temperature; After treating that blank reaches target temperature, stretcher makes the blank applying die surface qualified parts that are shaped through stretching-coating-stretching-heat forming technologies such as insulation creep.
Wherein, when described blank was sheet material, stretcher was the numerical control stretching machine, stretching former; When blank was section bar, stretcher was the numerical control stretch benders.
Wherein, said insulating blanket is materials such as asbestos cloth, mica sheet, ceramic fiber blanket or asbestos packing sheet;
Wherein, the running parameter of said power-supply system is: voltage is that 3V～36V, electric current are 500A～5000A;
Wherein, the temperature of said temperature control system control blank is 600 ℃～750 ℃;
Wherein, the model specification of said spring is 2 * 20D1 * 160;
Wherein, the material of said mould is NI7N.
(2) processing method of a kind of titanium alloy thin wall part of the present invention hot forming frock, these method concrete steps are following:
After step 5, prestretched reached prestrain, the workbench of stretcher drove on the die device and moves, 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;
Behind step 6, the blank applying mould, under 600 ℃～750 ℃ of target temperatures with strain rate 1.0*10
-2～1.0*10
-4/ s mends blank and draws, and is 0.1～8% until whole range of strain;
Described a kind of titanium alloy thin wall part hot forming frock, when this blank was sheet material, stretcher was the numerical control stretching machine, stretching former; When blank was section bar, stretcher was the numerical control stretch benders.
3, advantage and effect: the present invention compares with conventional art; Advantage is: because 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, draw, be incubated the creep forming blank in stretcher prestretched, coating, benefit then; Make blank applying mould, the visco-plasticity distortion takes place.This frock has avoided not only that monoblock type adds the thermal loss of heat loss on other parts such as mould in traditional hot shaping, the superplasticforming; And make that heating process is very fast, the blank internal temperature is very even; Greatly improved the energy utilization ratio and the efficiency of heating surface, oxidation reduction.In addition, blank heating forms behind target temperature, and is temperature-resistant, and uniformity of temperature profile, helps the visco-plasticity distortion of blank, improves product quality.
Description of drawings
Fig. 1 is a kind of titanium alloy thin wall part hot forming fixture system sketch map.
Fig. 2 is a frock mould therefor device front view of the present invention.
Fig. 3 is a frock mould therefor device closure state side view of the present invention.
Fig. 4 is a frock mould therefor device A-A cutaway view of the present invention.
Fig. 5 is a frock mould therefor device B-B cutaway view of the present invention.
Fig. 6 is a 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 when finishing that is shaped.
Symbol description is following among the figure:
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 cushion 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 leads; 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 done further explanation.
(1) a kind of titanium alloy thin wall part of the present invention hot forming frock; It is made up of stretcher 2, die device 3, blank 9, power- supply system 1 and 6 five parts of temperature control system, and the position annexation between them is: die device 3 is placed on the central workbench 32 of stretcher 2, blank 9 is passed the sidewall crack 13 of die device 3; Adopt insulation and thermal insulation bed course 8 to make clamp 7, mould 10 surfaces and the frock insulation thereof of blank 9 and stretcher 2; Open power-supply system 1, give the electrode clamping plate 4 energisings, in blank 9, produce electric current; Heating blank 9; Rely on that temperature control system 6 is measured, the temperature of control blank 9, treat that blank 9 reaches target temperature after, stretcher 2 makes blank 9 applying moulds 10 shaping surfaces go out qualified parts through stretching-coating-stretching-heat forming technologies such as insulation creep.
The present invention's a kind of titanium alloy thin wall part hot forming frock comprises five parts:
1) stretcher 2, as the well-known a kind of former of aircraft industry, generally are divided into stretching machine, stretching former, stretch benders; Said stretcher is vertical structure 100 tonnage control stretching-machines, is made up of lathe bed 31 left-right symmetric lathe bed 31, swing arm 30, clamp 7 and workbench 32; 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, through slide block 36 lathe bed 31, swing arm 30 are linked together, and swing arm 30 is main motions of stretching-machine; Motion mode such as can realize that prestretched, bending, benefit are drawn is realized the titanium alloy thin wall part forming.
2) die device 3; Specifically comprise: go up incubator 11, following incubator 27, mould 10 and mould cushion block 23 thereof, insulating pad 24, backing plate 12; Position annexation between them is: mould 10, mould cushion block 23, insulating pad 24 and backing plate 12 are placed on down in the incubator 27 successively from top to bottom; Last incubator 11 and following incubator 27 are connected fixing through bolt nut structure 17, in the utilization carriage 34 of the handle 33 of incubator and following incubator can open, close die device 3; Should go up incubator 11 and adopt the rectangular hollow shell structure, two-layer inside and outside the branch, skin is last incubator shell 14; Play 15 effects of fixed support heat-insulation layer, internal layer is to go up haybox cooking layer 15, and material is the vacuum fiber; Main component is an alundum (Al, plays the heat-insulation and heat-preservation effect; This time incubator 27 adopts the rectangular hollow shell structures, and is two-layer inside and outside the branch, and outer is following incubator shell 28; Play the effect of fixed support heat-insulation layer, internal layer is following haybox cooking layer 18, and material is the vacuum fiber; Main component is an alundum (Al; Play the heat-insulation and heat-preservation effect,, be shaped used mould element insulating blanket 8, mould 10, mould cushion block 23, insulating pad 24 are housed in following incubator 27 inside; This insulating blanket 8 is asbestos cloths; This mould 10 is single-curvature drawing dies, and material is NI7N, and die surface is blank used working face when being shaped; These mould cushion 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 following incubator 27 insulation; This backing plate 12 is rectangular solid heat-resisting steel sheet and plates, plays fixing incubator and mould element down.Wherein, Last incubator 11 comprises: go up incubator shell 14, go up haybox cooking layer 15, go up haybox cooking layer fixed head 16, sliding-rail groove 29, handle 33, locator 39; Relation is therebetween: go up haybox cooking layer fixed head 16 and stand upright between incubator shell 14 and the last haybox cooking layer 15; Sliding-rail groove 29 is arranged on around the incubator 11 and with last incubator shell 14 and is connected; Locator 39 is positioned at both sides, incubator shell 14 middle part, and being used to loosen, tighten can be at the sidewall of 29 li slips of sliding-rail groove in the incubator; Handle 33 is positioned at incubator shell 14 anteriomedial positions; Should go up incubator shell 14 is metal cabinet formula structures; Should go up haybox cooking layer 15 is rectangular solid vacuum fibers, plays insulation effect; Should go up haybox cooking layer fixed head 16 is 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, and is used for incubator on unlatching, the closure; Following incubator 27 comprises: following haybox cooking layer 18, haybox cooking layer fixed head 19, incubator shell 28, spring 20, vertical columns 21, side shield 22, insulating blanket 8, mould 10, mould cushion block 23, insulating pad 24, backing plate 12, mold heated hole 25, peep hole 26, sliding-rail groove 29, carriage 34 down down; Its position annexation is: mould 10, mould cushion block 23, insulating pad 24, backing plate 12 are placed on down in the incubator shell 28 successively from top to bottom; Mold heated hole 25 is arranged on the mould 10; Peep hole 26 is arranged on down on the incubator shell 28; Sliding-rail groove 29 is arranged on down around the incubator 27 and with following incubator shell 28 and is connected; Spring 20, vertical columns 21 are playing between incubator shell 28 and the side shield 22 and are being clipped in haybox cooking layer fixed head 19 and backing plate 12 centres down, and carriage 34 is connected with following 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 a stage clip, model specification: 2 * 20D1 * 160 GB2089-80; 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 by drawing and the homemade metal pattern of arts demand; This mould cushion 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 following incubator insulation; This backing plate 12 is rectangular solid heat-resisting steel sheet and plates, plays fixing incubator, mould element down; This sliding-rail groove 29 is metallic channel steel constructions; This carriage 34 is metal angle structures.Upper and lower incubator is by shown in Figure 4, and is fixing through bolt nut structure 17 connections, utilizes 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 that insulating pad 24 is isolated mould and following incubator; 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 used titanium alloy thin wall blank that is shaped can be thin-walled blanks such as titanium alloy plate, section bar, at said 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, connects transformer output and electrode clamping plate by lead 38 again, through gauge tap, gives blank 9 switchings.
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 control blank 9 temperature, and temperature control system 6 is automatic programmed control in whole forming period.
Working procedure of the present invention is following: die device 3 is placed on the workbench 32 of stretcher 2 central authorities; Blank 9 is passed the sidewall crack 13 of die device, adopt insulation and thermal insulation bed course 8 to make clamp 7, mould 10 surfaces and die device 3 insulation thereof of blank 9 and stretcher 2, open power-supply system 1; Give the electrode clamping plate 4 energisings; In blank 9, produce electric current, heating blank 9 relies on the temperature that thermocouple 5 is measured, temperature control system 6 is controlled blanks 9; After treating that blank 9 reaches target temperature, stretcher 2 makes blank applying mould 10 shaping surfaces go out part 37 through stretching-coating-stretching-heat forming technologies such as insulation creep.
(2) processing method of a kind of titanium alloy thin wall part of the present invention hot forming frock, these method concrete steps are following:
After step 5, prestretched reached prestrain, the workbench of stretcher 2 32 drove on the die devices 3 and moves, 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;
Behind step 6, the blank 9 applying moulds 10, under 600 ℃～750 ℃ of target temperatures with strain rate 1.0*10
-2～1.0*10
-4/ s mends blank 9 and draws, and is 0.1～8% until whole range of strain;
Described a kind of titanium alloy thin wall part hot forming frock is characterized in that when described blank 9 was sheet material, stretcher 2 was numerical control stretching machine, stretching formers; When blank 9 was section bar, stretcher 2 was numerical control stretch benders.
Claims (8)
1. titanium alloy thin wall part hot forming frock; It is characterized in that: it is made up of stretcher, die device, blank, power-supply system and five parts of temperature control system, and die device is placed on the central workbench of stretcher, and blank passes 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, in blank, produce electric current; The heating blank; Rely on that temperature control system is measured, the control blank temperature, treat that blank reaches target temperature after, stretcher makes the blank applying die surface qualified parts that are shaped through stretching-coating-stretching-insulation creep heat forming technology;
Said stretcher is vertical structure 100 tonnage control stretching-machines, and it can realize prestretched, bending, benefit roping flowing mode, realizes the titanium alloy thin wall part forming;
Said die device; Specifically comprise: go up incubator, following incubator, mould, mould cushion block, insulating pad and backing plate; Mould, mould cushion block, insulating pad and backing plate are placed on down in the incubator successively from top to bottom; Last incubator and following incubator are connected fixing through bolt nut structure, in the utilization carriage of the handle of incubator and following incubator can open, the close die device; Should go up incubator and adopt the rectangular hollow shell structure, two-layer inside and outside the branch, outer last incubator shell for the heat-resisting steel sheet and plate making plays the effect of fixed support heat-insulation layer, and internal layer is a heat-insulation layer, and material is the vacuum fiber, and composition is an alundum (Al, plays the heat-insulation and heat-preservation effect; Should go up incubator comprises: go up the incubator shell, go up the haybox cooking layer, go up haybox cooking layer fixed head, sliding-rail groove, handle and locator; Last haybox cooking layer fixed head stands upright between incubator shell and the last haybox cooking layer; Sliding-rail groove is arranged on around the incubator and with last incubator shell and is connected; Locator is positioned at both sides, incubator shell middle part, is used to loosen, tighten the sidewall that can in sliding-rail groove, slide in the incubator; Handle is positioned at incubator shell anteriomedial position; Should go up the incubator shell is metal cabinet formula structure; Should go up the haybox cooking layer is rectangular solid vacuum fiber, plays insulation effect; Should go up haybox cooking layer fixed head is 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, and is used for incubator on unlatching, the closure; This time incubator adopts the rectangular hollow shell structure, and is two-layer inside and outside the branch, and outer following incubator shell for the heat-resisting steel sheet and plate making plays the effect of fixed support heat-insulation layer, and internal layer is a heat-insulation layer, and material is the vacuum fiber, and composition is an alundum (Al, plays the heat-insulation and heat-preservation effect; This time incubator comprises: following haybox cooking layer, following haybox cooking layer fixed head, following incubator shell, spring, vertical columns, side shield, insulating blanket, mould, mould cushion block, insulating pad, backing plate, mold heated hole, peep hole, sliding-rail groove and carriage; Mould, mould cushion block, insulating pad, backing plate are placed on down in the incubator shell successively from top to bottom; The mold heated hole is arranged on the mould and can inserts electrically heated rod; Peep hole is arranged on down on the incubator shell; Sliding-rail groove is arranged on down around the incubator and with following incubator shell and is connected, and spring, vertical columns are in the middle of playing between incubator shell and the side shield and being clipped in following haybox cooking layer fixed head and backing plate, and carriage is connected with following incubator shell; This time haybox cooking layer is a rectangular solid vacuum fiber, plays insulation effect; This time haybox cooking layer fixed head is the metal concave plate; This time incubator shell is a metal cabinet formula structure; This spring is commercial stage clip; This vertical columns is a cylindrical structural; This side shield is the metal rectangular plate; This insulating blanket is an electric insulation of realizing blank and stretcher, die device; This mould is the single-curvature stretching die, and it is by drawing and the homemade metal pattern of arts demand, and die surface is blank used working face when being shaped; This mould cushion block is a 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 following incubator insulation; This backing plate is the rectangular solid heat-resisting steel sheet and plate, plays fixing incubator, mould element down; This sliding-rail groove is the metallic channel steel construction; This carriage is the metal angle structure;
Said blank, the used titanium alloy thin wall blank that is shaped, it is titanium alloy plate, section bar thin-walled blank, energising is from the resistance heating in this shaping frock;
Said power-supply system, overall power 36KW comprises: the 380V power supply is connected on the transformer, becomes low pressure, connects transformer output and electrode clamping plate by lead again, through gauge tap, gives the blank switching;
Said temperature control system comprises: the thermocouple measurement blank temperature, according to temperature feedback signal, adopt PLC single-chip microcomputer closed-loop control source current, and then the control blank temperature, temperature control system is automatic programmed control in whole forming period.
2. the processing method of a titanium alloy thin wall part hot forming frock, it is characterized in that: these method concrete steps are following:
Step 1, die device is positioned on the workbench of stretch forming apparatus, insulating blanket is placed on isolated insulation blank in the clamp of stretcher;
Step 2, the tight blank of electrode holder plate holder, the energized system gives the energising of electrode clamping plate, produces electric current, makes blank heating;
Step 3, measure the temperature of blank in real time through thermocouple; And adjust the output voltage of power-supply system in real time; Make the rate of heat addition of blank reach 5～25 ℃/s, at this moment, 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, clamp blank at the clamp of this temperature stretched equipment, with strain rate 1.0*10
-2～1.0*10
-4/ s carries out prestretched, is 0.1～4% until the prestrain scope;
After step 5, prestretched reached prestrain, the workbench of stretcher drove on the die device and moves, 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;
Behind step 6, the blank applying mould, under 600 ℃～750 ℃ of target temperatures with strain rate 1.0*10
-2～1.0*10
-4/ s mends blank and draws, and is 0.1～8% until whole range of strain;
Step 7, blank are pasting mould, are keeping under target temperature, the whole strained condition, and insulation 5～100Min makes the inner stress relaxation that takes place of blank, realizes creep forming;
Step 8, the system that cuts off the electricity supply stop the blank power supply is taken off formation of parts, process finishing after cooling.
3. a kind of titanium alloy thin wall part hot forming frock according to claim 1, it is characterized in that: when described blank was sheet material, stretcher was the numerical control stretching machine, stretching former; When blank was section bar, stretcher was the numerical control stretch benders.
4. a kind of titanium alloy thin wall part hot forming frock according to claim 1, it is characterized in that: said insulating blanket is asbestos cloth, mica sheet, ceramic fiber blanket, asbestos packing sheet 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 said 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 of said temperature control system control 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 said 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 said 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 |
Applications Claiming Priority (1)
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