CN103567271A - Inflating thermal-expansion forming method for titanium alloy panel - Google Patents

Abstract

The invention discloses an inflating thermal-expansion forming method for a titanium alloy panel. A forming tool is of a group of upper and lower thermal forming dies with the same-sized notches, a gas inlet, a vent, two titanium alloy panel blank materials needing to be formed, a gas source, a gas source control cabinet, a high-temperature furnace and a detecting container are respectively arranged at the bottom of the forming cavity of the forming dies; the inflating quantization and visualization of an expansion process are realized, and the forming difference of parts is reduced.

Description

A kind of titanium alloy plate inflation heat expansion manufacturing process

Technical field

The present invention relates to titanium alloy plate inflation heat expansion forming technique field, specifically a kind of titanium alloy plate that utilizes is under thermal creep state, and the process that adopts inflation heat expansion to be shaped realizes the method for part forming.

Technical background

Titanium alloy thermal creep manufacturing process adopts the mode of coupling contour forming conventionally at present, but in the process being shaped, material is because pressurized flow loses constraint, when coupling mould does not reach closure state, material surface has been covered with gauffer, the phenomenon that causes part to occur serious dead wrinkle and scrap, is seriously restricting the quality of part.Given this, must find a kind of new manufacturing process, replace coupling mould working method.

Applicant is in the patent ZL200820005892.4 of application in 2008, " a kind of decompressor being shaped for panel beating thermal creep " is provided, this pressurizing device, in the thermal creep forming process of panel beating woollen, support the use with female die for forming, panel beating woollen is placed between female die for forming and pressurizing device, this pressurizing device is withheld at the upper side of panel beating woollen and is kept sealing as cap, cavity conveying high-pressure inert gas by from pressure source to pressurizing device, even to panel beating woollen by inert gas, continu to press, make panel beating woollen progressively creeping deformation and female die for forming subsides tire.The advantage of this patent is: this pressurizing device is simple in structure, can support the use from different female die for formings, can guarantee that panel beating woollen is stressed even in thermal creep forming process, efficiently solves the difficult problem that a large amount of gauffers appear in part in forming process.In actual use, there is following inferior position in this patented technology: 1. source of the gas is uncontrollable, only by simple valve, controls, and can not quantize inflation; 2. inflate each time the forming process part that can only be shaped, production efficiency is low; 3. in inflation forming process, because lacking the checkout gear of reflection part forming degree, wayward to the process being shaped.Above inferior position is produced and is caused adverse effect parts batch, as because gas replenishment process can not quantize, produce and can only by virtue of experience, can not form unified standard each time, can there is wall unevenness, paste the large problem of tire gap difference in the part mass-producing, have a strong impact on part and criticize the quality of production.

Summary of the invention

For overcoming the deficiencies in the prior art, the object of the invention is to disclose a kind of titanium alloy plate inflation heat expansion manufacturing process.

An inflation heat expansion manufacturing process, is characterized in that containing with lower device and step:

1) fixture for forming is one group of thermoforming mould up and down that recess is measure-alike, and the forming cavity of this shaping mould bottom is respectively equipped with air admission hole and steam vent, have two titanium alloy plate woollens that need moulding, have source of the gas and source of the gas switch board, have high temperature furnace and inspection instrument;

2) by two, need the surface of the titanium alloy plate woollen of moulding except its technique periphery, to coat only solder flux, then by two surperficial make-ups that need the titanium alloy plate woollen of moulding, separately have in the interlayer chamber of a titanium alloy breather pipe clamp between this sheet material woollen, one end of titanium alloy breather pipe is led to outside the technique periphery of this sheet material woollen, adopts welding method to realize sealing to the technique periphery of this sheet material woollen;

3) by step 2) titanium alloy plate blank after described sealing technology periphery, clamping connection is between the forming cavity of the measure-alike thermoforming mould up and down of the recess of fixture for forming described in step 1);

4) fixture for forming described in step 3) is placed in high temperature furnace, by breather pipe, by the air admission hole of this thermoforming mould and clamping connection, the titanium alloy breather pipe between titanium alloy plate woollen is communicated with the source of the gas and the source of the gas switch board that are placed in outside high temperature furnace respectively, the steam vent of this thermoforming mould inserts by breather pipe under the liquid level that is positioned at the inspection instrument outside high temperature furnace simultaneously, forms gas flow channel;

5) by source of the gas switch board, in the forming cavity up and down of thermoforming mould, at the uniform velocity inflate, for preventing that blank surface from generating oxide layer because contacting with air;

6) when the thermoforming mould in high temperature furnace is warming up to predetermined temperature, stop the shaping interacvity air-filling to finishing die, interlayer chamber inflation heat expansion by from source of the gas switch board to titanium alloy plate woollen is shaped, the generation speed of observing bubble in inflation inspection instrument judges the speed of blank bulging, when without Bubble formation, show that bulging is complete, after insulation a period of time, take out blank, shear technique periphery formation of parts.

Described inspection instrument is the vessel that fill liquid, and liquid can be the neutral solutions such as water.

Described source of the gas switch board comprises manual, automatic two kinds of patterns, can as required different pressure and aeration speed be set, and parameter can be preserved and operation automatically.The unification that implementation procedure is controlled, reduces the difference between part.

The invention has the beneficial effects as follows: 1) by source of the gas switch board, in the upper and lower forming cavity of thermoforming mould, be at the uniform velocity filled with inert gas, gas source control system is realized the quantification of inflation, and then forming unified technological standards, inert gas can prevent that blank surface from generating oxide layer because contacting with air; 2) by source of the gas switch board, the interlayer chamber inflation heat expansion to blank is shaped, and judges the speed of blank bulging by observing the generation speed of bubble in inspection instrument, realizes the visual of Bulging Process; 3) by adopting double-deck woollen plate surrounding to weld, middle inflation, the process that upper lower impressions is shaped simultaneously, can both be shaped each time two and above part, enhance productivity greatly, saves mass energy and cost of labor; 4) realized the process unification that parts batch is produced, process control unification, part quality is unified, has greatly reduced the difference of part.

Below in conjunction with embodiment accompanying drawing, this application is described in further detail:

Accompanying drawing explanation

Fig. 1 is titanium alloy plate inflation heat expansion manufacturing process schematic diagram of the present invention

Fig. 2 is the structural representation of fixture for forming

Fig. 3 is the structure cutaway view of fixture for forming

Fig. 4 is the schematic diagram of titanium alloy plate shaping blank

Number description: the arrow in 1 source of the gas, 2 switch boards, 3 fixture for formings, 4 inspection instruments, 5 high temperature furnaces, 6 shaping woollens, 7 air admission holes, 8 breather pipes, 9 steam vents, 10 forming cavity, Fig. 3 refers to the flow direction of inert gas.

The specific embodiment

Referring to accompanying drawing, the application's titanium alloy plate inflation heat expansion manufacturing process as shown in the figure, fixture for forming 3 is comprised of one group of recess thermoforming mould measure-alike, make-up sealing up and down, the bottom of the forming cavity 10 of this shaping mould is respectively equipped with air admission hole 7 and steam vent 9, has two titanium alloy plate woollens 6 that need moulding, source of the gas 1 is one group of inert gas bottle, source of the gas switch board 2 is communicated with source of the gas 1 by breather pipe with fixture for forming 3 and inspection instrument 4, fixture for forming 3 is placed in high temperature furnace 5.

1) preparation of sheet material woollen

Only solder flux is coated on the surface of the titanium alloy plate woollen 6 that two needs are shaped except its technique periphery, then by two surperficial make-ups that need the titanium alloy plate woollen of moulding, separately there is a titanium alloy breather pipe 8 to be clipped in the interlayer chamber between this sheet material blank, one end of titanium alloy breather pipe 8 is led to outside the technique periphery of this sheet material blank, adopt welding method to realize sealing to the technique periphery of this sheet material blank, complete the preparation of sheet material woollen.(as Fig. 4)

2) airtight test of sheet material woollen

Sheet material woollen after step 1) welding is put into clear water reserviors, be communicated with the breather pipe 8 of source of the gas switch board 2 and sheet material woollen, to the interlayer chamber of sheet material woollen, be filled with a small amount of gas, by observing blank periphery, whether have Bubble formation to detect air-tightness.

3) inflation heat expansion forming process

By the sheet material woollen clamping connection after airtight inspection between the forming cavity 10 of upper and lower mould of thermoforming frock 3 that reaches uniform temperature, the technique periphery clamping connection of sheet material woollen 6 is at the periphery of upper and lower mould, fixture for forming 3 is placed in high temperature furnace 5, by breather pipe, by the air admission hole of finishing die 7 and clamping connection, the titanium alloy breather pipe 9 between sheet material woollen 6 is communicated with the source of the gas 1 and the source of the gas switch board 2 that are placed in outside high temperature furnace 5 respectively, and the steam vent 9 of this thermoforming mould inserts under the liquid level of the inspection instrument 4 being positioned at outside high temperature furnace 5 by breather pipe simultaneously; By source of the gas switch board 2, in the forming cavity up and down of thermoforming mould, at the uniform velocity inflate; After the thermoforming mould insulation certain hour in high temperature furnace 5, stop forming cavity inflating, by breather pipe 8, the interlayer chamber inflation heat expansion to sheet material woollen 6 is shaped source of the gas switch board 2, by observing the generation speed of bubble in inspection instrument 4, judge the speed of sheet material woollen 6 bulgings, when without Bubble formation, show that bulging is complete, after insulation a period of time, take out the sheet material woollen being shaped, shear technique periphery formation of parts.The forming technology is here the hot formed common process of titanium alloy, at this, does not repeat.

Claims (1)

1. titanium alloy plate is inflated a heat expansion manufacturing process, it is characterized in that containing with lower device and step:

1) fixture for forming is one group of thermoforming mould up and down that recess is measure-alike, and the forming cavity of this shaping mould bottom is respectively equipped with air admission hole and steam vent, have two titanium alloy plate woollens that need moulding, have source of the gas and source of the gas switch board, have high temperature furnace and inspection instrument;

2) by two, need the surface of the titanium alloy plate woollen of moulding except its technique periphery, to coat only solder flux, then by two surperficial make-ups that need the titanium alloy plate woollen of moulding, separately have in the interlayer chamber of a titanium alloy breather pipe clamp between this sheet material woollen, one end of titanium alloy breather pipe is led to outside the technique periphery of this sheet material woollen, adopts welding method to realize sealing to the technique periphery of this sheet material woollen;

3) by step 2) titanium alloy plate blank after described sealing technology periphery, clamping connection is between the forming cavity of the measure-alike thermoforming mould up and down of the recess of fixture for forming described in step 1);

4) fixture for forming described in step 3) is placed in high temperature furnace, by breather pipe, by the air admission hole of this thermoforming mould and clamping connection, the titanium alloy breather pipe between titanium alloy plate woollen is communicated with the source of the gas and the source of the gas switch board that are placed in outside high temperature furnace respectively, the steam vent of this thermoforming mould inserts by breather pipe under the liquid level that is positioned at the inspection instrument outside high temperature furnace simultaneously, forms gas flow channel;

5) by source of the gas switch board, in the forming cavity up and down of thermoforming mould, at the uniform velocity inflate, for preventing that blank surface from generating oxide layer because contacting with air;

6) when the thermoforming mould in high temperature furnace is warming up to predetermined temperature, stop the shaping interacvity air-filling to finishing die, interlayer chamber inflation heat expansion by from source of the gas switch board to titanium alloy plate woollen is shaped, the generation speed of observing bubble in inflation inspection instrument judges the speed of blank bulging, when without Bubble formation, show that bulging is complete, after insulation a period of time, take out blank, shear technique periphery formation of parts.

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