CN107931963A

CN107931963A - A kind of method that manufacture TC4 titanium alloys bore barrel-shaped sandwich construction

Info

Publication number: CN107931963A
Application number: CN201710382470.2A
Authority: CN
Inventors: 邸伟; 刘纪; 李永兵; 吴锋; 陈东; 张臣
Original assignee: Changzhou Tiantai Material Technology Co Ltd; Advanced Manufacture Technology Center China Academy of Machinery Science and Technology
Current assignee: Changzhou Tiantai Material Technology Co Ltd; Advanced Manufacture Technology Center China Academy of Machinery Science and Technology
Priority date: 2017-05-26
Filing date: 2017-05-26
Publication date: 2018-04-20
Anticipated expiration: 2037-05-26
Also published as: CN107931963B

Abstract

The present invention relates to a kind of method that TC4 titanium alloys bore barrel-shaped sandwich construction, manufactures the method that TC4 titanium alloys sandwich construction bores barrel-shaped component more particularly to superplastic forming/diffusion connection combined forming process, belongs to material processing field.The present invention realizes the superplastic forming/diffusion joint forming for boring barrel-shaped four-layer structure, improves forming quality and technology stability by using improving weldering bag manufacture method, changing the methods of design parameter in mould structure, specification technical process.Superplastic forming/diffusion connecting process of cone bucket class part is realized first, greatly reduces cost and the process-cycle of such part.

Description

A kind of method that manufacture TC4 titanium alloys bore barrel-shaped sandwich construction

Technical field：

The present invention relates to a kind of method that TC4 titanium alloys bore barrel-shaped sandwich construction, more particularly to superplastic forming/diffusion The method that combined forming process manufacture TC4 titanium alloys sandwich construction bores barrel-shaped component is connected, belongs to material processing field.

Background technology：

TC4 titanium alloys are widely used in navigating since it is with the various features such as specific strength is high, intensity is higher at 600 DEG C Empty space industry.TC4 titanium alloys bore the windward side that barrel-shaped sandwich construction is chiefly used in aircraft cowling rear end, its basic structure has It is three layers or four layers, more that riveting, welding manner connection are coordinated using machining, globality poor is built, or using solid construction, it is such Construction weight is larger, it is difficult to meets requirement of the aerospace field to loss of weight.Due to manufacturing a variety of difficulties of such component, how Finding the barrel-shaped Multi-layer structure member of new technology manufacture cone becomes current urgent problem.

The content of the invention：

It is barrel-shaped more to be difficult to shaping TC4 titanium alloy cones present invention aim to address current superplastic forming/diffusion connection method The problem of Rotating fields, there is provided a kind of method that manufacture TC4 titanium alloys bore barrel-shaped sandwich construction.

The step of a kind of method that manufacture TC4 titanium alloys bore barrel-shaped sandwich construction is realized includes：

Step 1：The plate of suitable thickness is chosen, wherein inside and outside plate thickness is slightly thicker than core plate.

Step 2：According to cone bucket Size calculation expansion billet size, and reserve the size of upper and lower air flue and cut portion Surplus.

Step 3：Roll bending is carried out to plate, enables to bend to a cone bucket, and preweld cleaning is carried out at abutment joint, Specific method is that should exceed 50mm using sand paper polishing seam crossing, one side cleaning width.

Step 4：Welding is carried out to cone bucket seam crossing, is carried out to boring the orthopedic taper cone barrel into standard of bucket, and using osmosis Weld seam leak detection.

Step 5：All cone buckets are cleaned, using dirt, the oil stain of the method cleaning panel surface of alkali cleaning+pickling Deng specific alkali wash water is NaHCO₃Solution, alkali cleaning time are 10min, and pickling uses HF acid+HNO₃The solution that acid+water is made into, Pickling time is 10min, then cleans plate 5min using 99.9% acetone soln.

Step 6：Solder resist is coated in core plate surface according to predetermined scheme, the coating position of solder resist is according to superplastic forming Inflatable technique specifically determines.

Step 7：Core plate is fitted together, argon arc welding soldering and sealing, and reserved gas tube orifice are carried out to cone bung hole up and down, afterwards Inside and outside panel and core plate are fitted together, argon arc welding edge sealing weldering is carried out to cone bung hole up and down, tracheae is welded in predeterminated position.

Step 8：Will cone bucket weldering it is packed enter mould in, connect tracheae, be integrally put into heating furnace.

Step 9：Plenum interior is vacuumized, then passes to a certain amount of argon gas.

Step 10：Be heated between 850~870 DEG C, keep the temperature 20min, argon gas is passed through from tracheal strips, make its with 0.05MPa/min counter plates gas chamber carries out continuous voltage rise, until panel air chamber pressure reaches certain pressure, heat-insulation pressure keeping 10min, Continue to being passed through argon gas in gas chamber, until panel air chamber pressure reaches certain pressure, heat-insulation pressure keeping 5min.Then by panel gas chamber It is depressurized to normal pressure.

Step 11：Be heated to 900 DEG C~950 DEG C, keep the temperature 10min, argon gas is passed through from tracheal strips, make its with 0.05MPa/min carries out continuous voltage rise to core plate gas chamber, until core plate air chamber pressure reaches certain pressure, heat-insulation pressure keeping 10min, Continue to being passed through argon gas in gas chamber, until core plate air chamber pressure reaches certain pressure, heat-insulation pressure keeping 5min.Then by core plate gas chamber It is depressurized to normal pressure.

Step 12：Workpiece is taken out at a certain temperature, is cooled to room temperature.

Brief description of the drawings

Fig. 1 is cone bucket four-layer structure (gabarit) and cone cylinder four-layer structure (inside) schematic diagram

Fig. 2 is expansion blank schematic diagram

Fig. 3 is solder resist coating position view

Fig. 4 is that titanium alloy bores barrel-shaped sandwich construction mould schematic diagram

Specific embodiment

Specific embodiment one：The present embodiment bores the manufacture method of bucket four-layer structure for TC4 titanium alloys.Bore four layers of knot of bucket Structure is as shown in Figure 1.

Step 1：Choose the core plate of 0.8mm, the panel of 1.5mm.

Step 2：According to cone bucket Size calculation expansion billet size, upper and lower air flue and cut portion stay 50mm surpluses altogether, Schematic diagram is as shown in Figure 2.

Step 3：Roll bending is carried out to plate, enables to bend to a cone bucket, and preweld cleaning is carried out at abutment joint, Specific method is that one side cleaning width is 50mm using sand paper polishing seam crossing.

Step 6：Solder resist is coated in core plate surface according to predetermined scheme, solder resist coating position is as shown in Figure 3.

Step 7：Four-layer structure has two layers of core plate, it is therefore desirable to fits together core plate, argon is carried out to cone bung hole up and down Arc-welding soldering and sealing, and reserved gas tube orifice, afterwards fit together inside and outside panel and core plate, and argon arc sealing is carried out to cone bung hole up and down Side is welded, and tracheae is welded in predeterminated position.

Step 9：Counter plate and core plate gas chamber vacuumize at the same time, then pass to a certain amount of argon gas, make plenum interior pressure Reach normal pressure.

Step 10：Be heated between 850~870 DEG C, keep the temperature 20min, argon gas is passed through from tracheal strips, make its with 0.05MPa/min counter plates gas chamber carries out continuous voltage rise, until panel air chamber pressure reaches 0.8MPa, heat-insulation pressure keeping 10min, after Continue to being passed through argon gas in gas chamber, until panel air chamber pressure reaches 3.5MPa, heat-insulation pressure keeping 5min.Then panel gas chamber is depressured To normal pressure.

Step 11：Be heated to 900 DEG C~950 DEG C, keep the temperature 10min, argon gas is passed through from tracheal strips, make its with 0.05MPa/min carries out continuous voltage rise to core plate gas chamber, until core plate air chamber pressure reaches 1MPa, heat-insulation pressure keeping 10min, continues To being passed through argon gas in gas chamber, until core plate air chamber pressure reaches 4MPa, heat-insulation pressure keeping 5min.Then core plate gas chamber is depressurized to often Pressure.

Mould in step 8 bores barrel-shaped sandwich construction mould for TC4 titanium alloys, its structure is as shown in figure 4, TC4 titaniums close Gold is bored barrel-shaped sandwich construction mould and is mainly made of external mold, internal model, flanging ring three parts.Mould is innovative using circumferential whole Body, axial segmentation structure, a series of such as inner faces caused by eliminating conventional barrel-shaped valving die are formed with step, each swollen valve The problem of discontinuity.

First step diffusion bonding strength in step 10 be 300MPa~350MPa, the second step diffusion company in step 11 It is 200~230MPa to connect intensity.

Claims

1. a kind of method that manufacture TC4 titanium alloys bore barrel-shaped sandwich construction, its feature include：

Step 2：According to cone bucket Size calculation expansion billet size, and more than the size of reserved upper and lower air flue and cut portion Amount.

Step 3：Roll bending is carried out to plate, enables to bend to a cone bucket, and preweld cleaning is carried out at abutment joint, specifically Method is that should exceed 50mm using sand paper polishing seam crossing, one side cleaning width.

Step 4：Welding is carried out to cone bucket seam crossing, weld seam is carried out to boring the orthopedic taper cone barrel into standard of bucket, and using osmosis Leak detection.

Step 5：All cone buckets are cleaned, using the dirt of the method cleaning panel surface of alkali cleaning+pickling, oil stain etc., tool The alkali wash water of body is NaHCO3 solution, and the alkali cleaning time is 10min, and pickling uses the solution that HF acid+HNO3 acid+water is made into, pickling Time is 10min, then cleans plate 5min using 99.9% acetone soln.

Step 7：Core plate is fitted together, argon arc welding soldering and sealing, and reserved gas tube orifice are carried out to cone bung hole up and down, afterwards by Outer panels and core plate fit together, and carry out argon arc welding edge sealing weldering to cone bung hole up and down, tracheae is welded in predeterminated position.

Step 10：It is heated between 850~870 DEG C, keeps the temperature 20min, argon gas is passed through from tracheal strips, makes it with 0.05MPa/ Min counter plates gas chamber carries out continuous voltage rise, until panel air chamber pressure reaches certain pressure, heat-insulation pressure keeping 10min, continues to gas Interior is passed through argon gas, until panel air chamber pressure reaches certain pressure, heat-insulation pressure keeping 5min.Then panel gas chamber is depressurized to often Pressure.

Step 11：900 DEG C~950 DEG C are heated to, 10min is kept the temperature, argon gas is passed through from tracheal strips, makes it with 0.05MPa/ Min carries out continuous voltage rise to core plate gas chamber, until core plate air chamber pressure reaches certain pressure, heat-insulation pressure keeping 10min, continues to gas Interior is passed through argon gas, until core plate air chamber pressure reaches certain pressure, heat-insulation pressure keeping 5min.Then core plate gas chamber is depressurized to often Pressure.

2. the mould in step 8 according to claim 1 bores barrel-shaped sandwich construction mould for TC4 titanium alloys, mainly by outer Mould, internal model, flanging ring three parts composition, mould is using circumferential overall, axial segmentation structure.