CN104028729A - Vacuum low-pressure casting forming device for titanium alloy component - Google Patents
Vacuum low-pressure casting forming device for titanium alloy component Download PDFInfo
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- CN104028729A CN104028729A CN201410202210.9A CN201410202210A CN104028729A CN 104028729 A CN104028729 A CN 104028729A CN 201410202210 A CN201410202210 A CN 201410202210A CN 104028729 A CN104028729 A CN 104028729A
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Abstract
The invention provides a vacuum low-pressure casting forming device for a titanium alloy component. The vacuum low-pressure casting forming device for the titanium alloy component comprises a device body, a vacuum low-pressure casting pneumatic control system and an electronic control system. An upper chamber and lower chamber type structure is adopted by the device body, a water-cooled copper crucible is arranged in a lower chamber, a casting mold is arranged in an upper chamber, an intermediate separation plate is arranged between the upper chamber and the lower chamber, and a liquid lifting pipe is arranged on the intermediate separation plate. The vacuum low-pressure casting pneumatic control system is connected with the device body, a vacuum system and a protective gas source system, and digital combination valves are adopted as flow regulation actuators. The electronic control system is composed of an industrial control computer and a PLC. After the smelting process of titanium alloy is completed in a smelting chamber, the water-cooled copper crucible is lifted to a casting position through a lifting device, an upper chamber and lower chamber intercommunication valve is closed, the flow of protective gas fed into the lower chamber is controlled through the computer, the pressure difference between the upper chamber and the lower chamber is established, the liquid alloy is filled in the casting mold through the liquid lifting pipe under the action of the pressure difference, and the casting process is completed. Compared with traditional centrifugal casting and bottom leakage type suction casting, the mold-filling capacity and solidification feeding capacity of the titanium alloy can be improved, castings with better casting quality and thinner wall thicknesses can be obtained, and a new means is provided for batch production of minitype titanium alloy components.
Description
Technical field
The present invention relates to titanium alloy antigravity casting field, specifically, relate to a kind of titanium alloy member vacuum low-pressure cast form device, belong to casting and Casting Equipment field.
Background technology
Titanium alloy has the excellent combination properties such as density is low, specific strength is high, corrosion-resistant, is a kind of important structural material in aerospace field.Centrifugal casting is the most frequently used method of Ti alloy casting, but in casting process, technological parameter is wayward, and the existence of centrifugal force can cause the inhomogeneities of foundry goods chemical composition, finally causes the inhomogeneities of mechanical castings.In Chinese patent [201010615723.4: the cast moulding method of a kind of little Type Titanium Alloy or titanium-aluminium alloy intricate casting], this invention proposes a kind of method of leakage type suction pouring precision-investment casting method shaping titanium alloy casting, the method makes aluminium alloy fill type along gravity direction by gravity and pull of vacuum, belong to gravitational casting category, cannot alloy flow velocity in cavity filling process and fluidised form control, affect the final inherent quality of foundry goods.In Chinese patent [200810150364.2: a kind of casting method of titanium or titanium alloy], this invention has adopted a kind of method that is similar to suction pouring, by furnace chamber vacuum in quick extraction, pure titanium or titanium alloy liquid are entered in casting mould case against gravity direction along stalk.But the suction of suction pouring casting power is limited, and filling type power and solidifying feeding pressure of aluminium alloy is all less, cannot be used for the production of larger foundry goods.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of titanium alloy member vacuum low-pressure cast form device, can adopt vacuum low-pressure casting method to produce titanium alloy member.This device, after titanium alloy vacuum melting completes, completes low pressure casting preparation by crucible lifting, then in chamber, passes into protective gas downwards, makes aluminium alloy rise and enter casting mold die cavity solidification forming along stalk, completes low pressure casting process.The gas flow that this device enters lower chamber by control is realized the control of alloy liquid filling velocity, have filling velocity controlled, fill the feature that type is steady, casting flaw is few.
A kind of titanium alloy member vacuum low-pressure cast form device provided by the invention, comprises that equipment body, vacuum low-pressure make pneumatic control system, electric-control system.
Equipment body adopts upper and lower cell-type structure, and Ji Xia chamber, upper chamber is respectively with cooling water recirculation system.The lower indoor water jacketed copper crucible that is placed with, introduces point by equipment body electrode and is connected with induction power supply.Water jacketed copper crucible is connected with lowering or hoisting gear, can drive water jacketed copper crucible to pump.Casting mold is placed in chamber, upper indoor have heating and heat-insulating device and formwork fixture.Equipment body is connected with vacuum low-pressure casting pneumatic control system by pipeline.
Vacuum low-pressure casting pneumatic control system comprises the pipeline composition that is connected with the vacuum control pipeline of vacuum system and is connected with protective gas air supply system.Vacuum system is made up of vacuum tank, mechanical pump, diffusion pump and booster pump.Protective gas air supply system is made up of air accumulator and protective gas generating means.Vacuum low-pressure casting pneumatic control system adopts digital combination valve as Flow-rate adjustment executing agency, by the control of computer realization Flow-rate adjustment.
Electric-control system mainly contains industrial computer and PLC composition.Industrial control computer is mainly as parameter setting, data monitoring and data storage; PLC, as field controller, is responsible for spot sampling, data operation, control output.Industrial control computer is connected by RS485 communication port with PLC, realizes data sharing.Casting process adopts closed-loop control, is provided with monitored picture on monitor, and energy real-time monitored is to setting pressure and actual pressure, and the duty of each element.
The present invention combines antigravity casting and titanium alloy water-cooled copper crucible Induction Melting Technology, has realized the vacuum low-pressure casting of titanium alloy member, for titanium alloy member provides a kind of feasible casting technique means.Melting completes under vacuum state, and casting and process of setting complete under inert protective gas.Vacuum low-pressure casting can improve the mold-filling capacity of melts of titanium alloy, is conducive to improve the feeding capacity of member in forming process and suppresses member produce in forming process the tendency of Segregation of Chemical Composition.
Brief description of the drawings
Below in conjunction with drawings and embodiments, a kind of titanium alloy component low pressure of the present invention cast form device is described in further detail.
Fig. 1 is titanium alloy member vacuum low-pressure casting shape apparatus structure schematic diagram of the present invention.
1. descend in 2.Xia chamber, chamber cooling water outlet and inlet 3. copper crucible electrode access point 4. water jacketed copper crucible 5. stalk 6. median septum 7. sealing gasket 8. lock sealing mechanisms 9. on 10. resistance wire 11. electrode interfaces 12. of chamber on chamber cooling water outlet and inlet 13. heat-insulation layer 14. formwork retaining mechanism 15. casting mold formworks 16. chamber intake and exhaust magnetic valve 17. vacuum systems 26. times chamber intake and exhaust electric-control stop valves of chamber intercommunication electric-control stop valve 19. computer control system 20. protective gas air supply system digital combination valve 23. exhaust electric-control stop valve 24. induction power supply 25. cooling water recirculation systems of 21. source of the gas electric-control stop valve 22., 27. electric induction switch 28. position catch 29. crucible lift mechanisms Shang Xia 18.
Detailed description of the invention
The present embodiment is a kind of titanium alloy member vacuum low-pressure cast form device
As shown in Figure 1, a kind of titanium alloy member vacuum low-pressure cast form device is mainly by lower chamber 1, lower chamber cooling water outlet and inlet 2, copper crucible electrode access point 3, water jacketed copper crucible 4, stalk 5, median septum 6, sealing gasket 7, lock sealing mechanism 8, upper chamber 9, resistance 10, electrode interface 11, upper chamber cooling water outlet and inlet 12, heat-insulation layer 13, formwork retaining mechanism 14, casting mold formwork 15, upper chamber intake and exhaust magnetic valve 16, vacuum system 17, upper and lower chamber intercommunication electric-control stop valve 18, computer control system 19, protective gas air supply system 20, source of the gas electric-control stop valve 21, digital combination valve 22, exhaust electric-control stop valve 23, induction power supply 24, cooling water recirculation system 25, lower chamber intake and exhaust electric-control stop valve 26, electric induction switch 27, position catch 28, crucible lift mechanism composition 29 compositions.
Lower chamber 1 and upper chamber 9 adopt Double water-cooled structure, and lower chamber cooling water outlet and inlet 2 and upper chamber cooling water outlet and inlet 12 are connected with cooling water recirculation system 25.Water jacketed copper crucible 4 is placed in lower chamber 1, and is connected with induction power supply 24 by copper crucible electrode access point 3.Crucible lifting structure 29 is positioned at Xia Shi 1 bottom centre, is connected with water jacketed copper crucible 3, can realize the elevating movement of crucible, and can control by position catch 28 and electric induction switch 27 the rise and fall position of crucible.
Median septum 6, between upper chamber 1 and lower chamber 9, plays the upper and lower chamber of isolation and places casting mold effect.Stalk 5 is placed in the hole at median septum 6 centers, be placed with the sealing gasket 7 of refractory material in the upper and lower end face of stalk 5 flanges, casting mold formwork 15 is placed on stalk 6 and sealing gasket 7, and by formwork retaining mechanism 14, casting mold, stalk and sealing gasket is compressed, and realizes sealing.Resistance wire 10, electrode interface 11, heat-insulation layer 13 are positioned at chamber 9, are mainly used in the preheating insulation to casting mold formwork.
Lock sealing mechanism 8 is mainly used in the lock sealing between lower chamber 1 and upper chamber 9, and under the driving of hydraulic jack, lock sealing mechanism 8 is around axial rotation, opening and sealing between chamber, lower chamber in realization.
Upper chamber intake and exhaust magnetic valve 16 is connected with upper chamber 9 by seamless steel pipe with vacuum system 17, and upper and lower chamber intercommunication electric-control stop valve 18 is connected with lower chamber 1 and upper chamber 9 by seamless steel pipe.Source of the gas electric-control stop valve 21, digital combination valve 22, exhaust electric-control stop valve 23 and lower chamber intake and exhaust electric-control stop valve 26 form low pressure casting pneumatic control system, wherein source of the gas electric-control stop valve 21 is connected with source of the gas 20, and lower chamber intake and exhaust electric-control stop valve 26 is connected with lower chamber 1.Wherein vacuum system 20 is made up of vacuum tank, mechanical pump, diffusion pump and booster pump, and air supply system 20 is made up of air accumulator and protective gas generating means.
Computer control system 19 mainly contains industrial computer and PLC composition.Industrial control computer is mainly as parameter setting, data monitoring and data storage; PLC, as field controller, is responsible for spot sampling, data operation, control output.Industrial control computer is connected by RS485 communication port with PLC, realizes data sharing.Casting process adopts closed-loop control, is provided with monitored picture on monitor, and energy real-time monitored is to setting pressure and actual pressure, and the duty of each element.
Workflow:
Before titanium alloy smelting starts, first lock sealing mechanism 8 is opened, remove chamber 9 and median septum 6, in water jacketed copper crucible 4, add titanium alloy material.Median septum 6 is placed into after lock sealing mechanism 8, on median septum 5, places stalk 5, make stalk 5 be in water jacketed copper crucible 4 tops, and place the sealing gasket 7 of refractory material in stalk flange top and bottom.Cast gate and the stalk mouth aligned in position of casting mold being touched to shell 15, be positioned on median septum 6, utilizes formwork retaining mechanism 14 that formwork is fixed, and realizes the sealing between formwork and stalk and upper and lower cavity dividing plate.Upper chamber 9 is placed in lock sealing mechanism 8, and lock sealing, make seal isolation between upper and lower chamber.By electrode interface 11, resistance wire 10 is switched on, realize the preheating insulation to casting mold formwork.
Open vacuum system 17 and open chamber intake and exhaust magnetic valve 16 and upper and lower chamber intercommunication electric-control stop valve, realize synchronous vacuum is set up in upper chamber 9 and lower chamber 1, in the time that vacuum reaches required vacuum, realize water jacketed copper crucible energising by copper crucible electrode access point 3, realize the hot smelting that adds to titanium alloy material.Because stalk 5 is in water jacketed copper crucible 4 tops, by induction melting radiant heat, it is carried out to preheating, can reduce the chill effect of stalk 15 to melts of titanium alloy in low pressure casting process.
After melting finishes, start vacuum low-pressure casting.First in computer control software, input corresponding low-pressure casting process parameter according to process requirements, after parameter input, industrial computer is by the memory reaching under parameter in PLC.Then close and close chamber intake and exhaust magnetic valve 16 and upper and lower chamber intercommunication electric-control stop valve 18, water jacketed copper crucible 4 is fast rise under the drive of elevating mechanism 29, and stalk 5 is immersed among melts of titanium alloy.Open source of the gas electric-control stop valve, lower chamber intake and exhaust electric-control stop valve; under computer control system regulation and control; the charge flow rate of real-time adjusting combination of numbers valve 22 is set according to parameter; protective gas is filled with in lower chamber 1 with certain speed; like this, between upper and lower chamber, form pressure reduction, titanium alloy melting liquid rises and enters in casting mold die cavity along stalk under differential pressure action; solidification forming under certain differential pressure action, realizes titanium alloy vacuum low pressure casting process.
After titanium alloy casting solidifies, close source of the gas electric-control stop valve 21, open upper and lower chamber intercommunication electric-control stop valve 18, pressure reduction between the upper and lower chamber of removal, be in stalk not solidified superalloy liquid flow back in crucible, start crucible lift mechanism 29, position while driving water jacketed copper crucible to be moved down into melting and to start.Open exhaust electric-control stop valve 23, make upper and lower chamber abolish vacuum, and return to atmospheric pressure state.Unclamp formwork retaining mechanism 14, open lock sealing mechanism, hang and go on chamber 9, take out foundry goods, complete casting process.
Claims (5)
1. a titanium alloy member vacuum low-pressure cast form device, is characterized in that being made up of equipment body, vacuum low-pressure casting pneumatic control system, electric-control system.
2. a kind of titanium alloy member vacuum low-pressure cast form device according to claim 1, is characterized in that adopting upper and lower cell structure.Between upper chamber, lower chamber, be placed with median septum, play the upper chamber of isolation, lower chamber and place casting mold, stalk effect; Between upper chamber, lower chamber, lock and open by lock sealing mechanism; Between upper and lower chamber, be connected with intercommunication electric-control stop valve.The indoor water jacketed copper crucible that is placed with, and water jacketed copper crucible is down connected with crucible lift mechanism, can move up and down; Upper be indoorly placed with casting mold formwork, and have heating and heat-insulating device and formwork fixture, can realize heat preheating and fixation to formwork.
3. according to a kind of titanium alloy member vacuum low-pressure cast form device described in claim 1 and 2, it is characterized in that vacuum low-pressure casting pneumatic control system is connected with equipment body intake and exhaust stop valve, and be connected with protective gas air supply system with vacuum system.Vacuum low-pressure casting pneumatic control system adopts digital combination valve as Flow-rate adjustment executing agency, by the control of computer realization Flow-rate adjustment.
4. the small-sized titanium alloy member of one according to claim 1 vacuum low-pressure cast form device, it is characterized in that electric-control system is mainly made up of industrial control computer and PLC, industrial control computer is mainly as parameter setting, data monitoring and data storage; PLC, as field controller, is responsible for spot sampling, data operation, control output.Industrial control computer is connected by RS485 communication port with PLC, realizes data sharing.
5. a kind of titanium alloy member vacuum low-pressure cast form device according to claim 1, it is characterized in that titanium alloy is in the smelting in suspension of lower indoor employing water jacketed copper crucible, before melting starts, open upper and lower chamber communicating valve synchronous vacuum is set up in upper chamber, lower chamber, start to add hot smelting; Melting finishes rear crucible lift mechanism and drives water jacketed copper crucible to rise, and stalk immerses after aluminium alloy, closes upper and lower chamber communicating valve; By the adjustment state of computer program control figure formula combination valve, by passing into protective gas in the downward chamber of certain speed, between upper and lower chamber, set up pressure reduction; Aluminium alloy rises and enters in casting mold die cavity along stalk under differential pressure action, and solidification forming, obtains required foundry goods.
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| CN104690249A (en) * | 2015-03-16 | 2015-06-10 | 河南科技大学 | Copper alloy vacuum counter-pressure casting machine |
| CN106392039A (en) * | 2016-11-12 | 2017-02-15 | 山西江淮重工有限责任公司 | Overflow-preventing system for counter-pressure casting machine |
| CN106994506A (en) * | 2017-05-18 | 2017-08-01 | 滨州戴森车轮科技有限公司 | A kind of low pressure casting stove with recycling-guard atmosphere |
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Application publication date: 20140910 |