CN102366836B - Production method of high-performance titanium alloy blind pipe - Google Patents
Production method of high-performance titanium alloy blind pipe Download PDFInfo
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- CN102366836B CN102366836B CN2011103283564A CN201110328356A CN102366836B CN 102366836 B CN102366836 B CN 102366836B CN 2011103283564 A CN2011103283564 A CN 2011103283564A CN 201110328356 A CN201110328356 A CN 201110328356A CN 102366836 B CN102366836 B CN 102366836B
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Abstract
The invention discloses a production method of a high-performance titanium alloy blind pipe. The production method comprises the following steps of: (a) coating a graphite coating on the surface of a core bar; (b) placing the core bar in a sheath cylinder and clamping the core bar at the centre of the sheath cylinder by using a core bar positioning tool; fixing the bottom end of the core bar on a sheath bottom cover, and welding the sheath bottom cover at the bottom end of the sheath cylinder; and then filling titanium alloy powder into a cavity which is formed by the sheath cylinder and the core bar; (c) welding a sheath top cover at the top of the sheath cylinder, reserving a space for placing a degasification pipeline, and vacuumizing the sheath cylinder; (d) fixing both ends of a sheath in a sheath hot isostatic pressing tool, and carrying out a thermal isostatic pressing process; (e) taking out the sheath, fixing both ends of the sheath on a hydraulic machine, and drawing out the core bar in the sheath; and (f) machining the core bar to obtain the titanium alloy blind pipe. According to the production method provided by the invention, because the core bar can be rapidly removed, the final size of the prepared high-performance thin and long titanium alloy blind pipe can be reached without machining an inner cavity, therefore, the production period is short, the yield is high, and the product performance and the internal quality are stable and reliable.
Description
Technical field
The present invention relates to a kind of manufacture method of titanium alloy slime blind-tube, be specifically related to a kind of method for fast mfg that surpasses 5% metal slime blind-tube for percentage elongation such as titanium alloy, Intermatallic Ti-Al compounds, and the performance of material reaches or near the forging level.
Background technology
The supporting structure size of carrier rocket secondary inter-tank section is big, the locus is strict, and the slime blind-tube that require to constitute supporting structure possesses that quality is light, the characteristics of good rigidity and stable performance.
Titanium alloy is one of aerospace field structural material commonly used, and the titanium alloy blind pipe is the critical component of supporting structure, and its shape is elongated, and length can be at 1～1.5 meter.In order to shorten the production cycle, common titanium alloy blind pipe is to adopt the method for hot investment casting to develop, but titanium alloy casting has defectives such as component segregation and microstructure segregation, brings adverse effect for the quality of product and the reliability aspect of performance.Utilizing forging processing is another kind of blind pipe manufacture method commonly used.The defective of this method is that the production cycle is long, and stock utilization is low, and characteristics such as material cost height, quality instability can't satisfy the needs that model is developed.
Summary of the invention
The object of the present invention is to provide a kind of manufacture method of Ti alloy with high performance blind pipe, the cycle of its manufacturing titanium alloy blind pipe is short, stock utilization is high, and steady quality is reliable, and the performance of pipe fitting reaches the level that is not less than forging.
Realize the technical scheme of the object of the invention: a kind of manufacture method of Ti alloy with high performance blind pipe, it adopts the high temperature insostatic pressing (HIP) near-net-shape method to make the titanium alloy blind pipe, specifically comprises the steps:
(a) apply the graphite-like coating as solder mask at mandrel surface; The diameter d of this plug=D-2 δ, wherein D is titanium alloy blind pipe internal diameter, δ is the thickness of graphite-like coating on the plug;
(b) plug is placed in the jacket tube, plug is stuck in middle position in the jacket tube by the plug positioning tool, and the bottom of plug is fixed on the jacket bottom, and the jacket bottom is welded on jacket tube bottom; Add the dress titanium alloy powder in the cavity that forms to the outer wall by the inwall of jacket tube and plug then;
After treating that titanium alloy powder installs to 1/2～2/3 place that requires height, take out the plug positioning tool, continue with titanium alloy powder the jacket tube to be filled up;
(c) at jacket tube welded top jacket top cover, reserve degasification line, the jacket tube is vacuumized, the vacuum in the jacket tube is higher than 3 * 10
-3During Pa, keep 6～8h, the sealing gas removing pipe;
(d) two ends of step (c) gained being finished the jacket of degasification are fixed in the jacket high temperature insostatic pressing (HIP) frock; Carry out hip treatment then, the technology of high temperature insostatic pressing (HIP) is: 900～960 ℃, and 1～5h, P 〉=120MPa;
(e) take out the jacket of finishing hip treatment in the jacket high temperature insostatic pressing (HIP) frock, the two ends of machining jacket then are to expose plug and titanium alloy blind pipe blank is as the criterion; Process screw one and screw two respectively at the two ends of jacket then, be connected a bolt respectively in screw one and the screw two, be fixed on the hydraulic press with the two ends of bolt with jacket then, by hydraulic press the plug in the jacket is extracted;
(f) the titanium alloy blind pipe blank in the jacket is processed into the titanium alloy blind pipe.
The manufacture method of aforesaid a kind of Ti alloy with high performance blind pipe, its described plug positioning tool for can be placed on the jacket tube in, the cylinder coaxial with the jacket tube, outer, cylinder top is stuck on the jacket tube, the cylinder bottom is stuck in the top of plug; Outer, top at the plug positioning tool has hole, adds the dress titanium alloy powder by these holes in the cavity of jacket tube and plug formation.
The manufacture method of aforesaid a kind of Ti alloy with high performance blind pipe, its described jacket high temperature insostatic pressing (HIP) frock comprises a support tube, jacket then is placed on the middle position of support tube, jacket is fixing with upper end cover and fixing top and the bottom that is separately positioned on support tube with bottom end cover of jacket, guarantee to be wrapped in and keep plumbness in the support tube, jacket is fixing to be connected on the plug by bolt with upper end cover, and jacket is fixing to be connected on the jacket bottom by bolt with bottom end cover.
The manufacture method of aforesaid a kind of Ti alloy with high performance blind pipe, the described screw one of its step (e) is opened on the plug, and screw two is opened on the titanium alloy blind pipe blank.
The manufacture method of aforesaid a kind of Ti alloy with high performance blind pipe, its described plug adopts mild steel to make, and plug is cylindric and front end is conehead.
The manufacture method of aforesaid a kind of Ti alloy with high performance blind pipe, the thickness δ value of its described graphite-like coating is: 2mm≤δ≤10mm.
Effect of the present invention is:
The present invention adopts the high temperature insostatic pressing (HIP) near-net-shape to make the titanium alloy slime blind-tube, be raw material with the titanium alloy pre-alloyed powder, utilize material design, manufacturing shaping jacket and plugs such as low-carbon (LC) steel or stainless steel, between 900～960 ℃, carry out hip treatment, remove jacket and plug then, obtain titanium alloy slime blind-tube blank, according to customer requirements blank is worked into final product appearance size at last.The method has good application prospects aspect the large scale titanium alloy supporting structure.
The plug that utilization of the present invention can be removed fast, the titanium alloy slime blind-tube inner chamber of formation need not machining and can reach the product final size, thereby can shorten the production cycle of product, and improves lumber recovery.The graphite-like coating that mandrel surface applies as the solder mask between plug and titanium alloy blind pipe blank, prevents that plug is connected by diffusion in hot isostatic pressing with titanium alloy powder.In the process of assembling, welding jacket, design and utilize the plug positioning tool that the position of plug is limited.In hot isostatic pressing, design and utilize the fixedly two ends of jacket of jacket high temperature insostatic pressing (HIP) frock, make to be wrapped in to keep vertical position in the hot isostatic pressing, guarantee that the jacket behind the high temperature insostatic pressing (HIP) can not bend.
Utilize the material property of the titanium alloy slime blind-tube of the inventive method preparation to reach the level that is not less than forging.Tensile strength σ
b〉=965MPa, yield strength σ
0.2〉=890MPa, percentage elongation δ
5〉=18%, ψ 〉=43%.The internal soundness of member reaches the A level of GJB 1580A-2004.The material property of product and internal soundness are stable, reliable.
Description of drawings
Fig. 1 uses schematic diagram for the plug positioning tool;
Fig. 2 uses schematic diagram for jacket with the high temperature insostatic pressing (HIP) frock;
Fig. 3 is plug removing method schematic diagram;
1. plug positioning tools among the figure; 2. plug; 3. jacket tube; 4. titanium alloy powder; 5. jacket bottom; 6. jacket is fixed and is used upper end cover; 7. support tube; 8. jacket is fixed and is used bottom end cover; 9. screw one; 10. titanium alloy blind pipe blank; 11. screw two.
The specific embodiment
Be further described below in conjunction with the manufacture method of the drawings and specific embodiments to a kind of Ti alloy with high performance blind pipe of the present invention.
The concrete manufacturing step of a kind of TC4 titanium alloy blind pipe manufacture method of the present invention is as follows:
(a) in plug 2 surface-coated graphite-like coatings as solder mask, the thickness δ value of graphite-like coating is 4mm.
This plug 2 adopts the low-carbon (LC) steel or stainless steel to make, and plug 2 is conehead for cylindric and front end.The diameter d of plug 2=D-2 δ, wherein D is titanium alloy blind pipe internal diameter, δ is the thickness of graphite-like coating on the plug 2.
(b) as shown in Figure 1, plug 2 is placed in the jacket tube 3, plug 2 is stuck in middle position in the jacket tube 3 by plug positioning tool 1, and the bottom of plug 2 is fixed on the jacket bottom 5, and jacket bottom 5 is welded on jacket tube 3 bottoms.Described plug positioning tool 1 for can be placed in the jacket tube 3, the cylinder coaxial with the jacket tube, outer, cylinder top is stuck in jacket tube 3 upper ends, the cylinder bottom is stuck in the top of plug 2; Outer, top at plug positioning tool 1 has hole, adds dress titanium alloy powder 4 by these holes in the cavity that forms to the outer wall by the inwall of jacket tube 3 and plug 2.
After treating that titanium alloy powder 4 installs to 2/3 place that requires height, take out plug positioning tool 1, continue with titanium alloy powder 4 jacket tube 3 to be filled up.
(c) at jacket tube 3 welded top jacket top covers, reserve degasification line, the jacket tube is vacuumized, the vacuum in the jacket tube is higher than 3 * 10
-3During Pa, keep 7h, the sealing gas removing pipe;
(d) as shown in Figure 2, the two ends of step c gained being finished the jacket of degasification are fixed in the jacket high temperature insostatic pressing (HIP) frock.Described jacket high temperature insostatic pressing (HIP) frock comprises a support tube 7, jacket then is placed on the middle position of support tube 7, jacket is fixing with upper end cover 6 and fixing top and the bottom that is separately positioned on support tube 7 with bottom end cover 8 of jacket, guarantee to be wrapped in and keep plumbness in the support tube 7, jacket is fixing to be connected on the plug 2 by bolt with upper end cover 6, and jacket is fixing to be connected on the jacket bottom 5 by bolt with bottom end cover 8.
Carry out hip treatment then, the technology of high temperature insostatic pressing (HIP) is: 930 ℃, and 3h, P 〉=120MPa;
(e) take out the jacket of finishing hip treatment in the jacket high temperature insostatic pressing (HIP) frock, the two ends of machining jacket then are to expose plug 2 and titanium alloy blind pipe blank 10 is as the criterion.As shown in Figure 3, process screw 1 and screw 2 11 respectively at the two ends of jacket then, screw 1 is opened on the plug 2, and screw 2 11 is opened on the titanium alloy blind pipe blank 10.Be connected a bolt respectively in screw 1 and the screw 21, be fixed on the hydraulic press with the two ends of bolt with jacket then, by hydraulic press the plug 2 in the jacket is extracted.
(f) the titanium alloy blind pipe blank 10 in the jacket is processed into the titanium alloy blind pipe.
The present invention is based on a kind of titanium alloy slime blind-tube Rapid Manufacturing Technology on the PM technique, namely apply the graphite-like coating as solder mask at the plug that is used for near-net-shape slime blind-tube inner chamber, in the cavity of plug and jacket formation, add titanium alloy powder then, and utilize hot isostatic pressing technique shaping titanium alloy slime blind-tube blank.After finishing hip treatment, utilize the method for mechanical drawing to remove the plug of titanium alloy slime blind-tube inside, utilize machining to remove the surplus of titanium alloy slime blind-tube outside then, obtain the satisfactory titanium alloy slime blind-tube of size outward appearance.
The concrete manufacturing step of a kind of TC4 titanium alloy blind pipe manufacture method of the present invention is as follows:
(a) in plug 2 surface-coated graphite-like coatings as solder mask, the thickness δ value of graphite-like coating is 2mm.
This plug 2 adopts the low-carbon (LC) steel or stainless steel to make, and plug 2 is conehead for cylindric and front end.The diameter d of plug 2=D-2 δ, wherein D is titanium alloy blind pipe internal diameter, δ is the thickness of graphite-like coating on the plug 2.
(b) as shown in Figure 1, plug 2 is placed in the jacket tube 3, plug 2 is stuck in middle position in the jacket tube 3 by plug positioning tool 1, and the bottom of plug 2 is fixed on the jacket bottom 5, and jacket bottom 5 is welded on jacket tube 3 bottoms.Described plug positioning tool 1 is for being placed on the cylinder in the jacket tube 3, and outer, cylinder top is stuck in jacket tube 3 upper ends, and the cylinder bottom is stuck in the top of plug 2; Outer, top at plug positioning tool 1 has hole, adds dress titanium alloy powder 4 by these holes in the cavity that forms to the outer wall by the inwall of jacket tube 3 and plug 2.
After treating that titanium alloy powder 4 installs to 1/2 place that requires height, take out plug positioning tool 1, continue with titanium alloy powder 4 jacket tube 3 to be filled up.
(c) at jacket tube 3 welded top jacket top covers, reserve degasification line, the jacket tube is vacuumized, the vacuum in the jacket tube is higher than 3 * 10
-3During Pa, keep 6h, the sealing gas removing pipe;
(d) as shown in Figure 2, the two ends of step c gained being finished the jacket of degasification are fixed in the jacket high temperature insostatic pressing (HIP) frock.Described jacket high temperature insostatic pressing (HIP) frock comprises a support tube 7, jacket then is placed on the middle position of support tube 7, jacket is fixing with upper end cover 6 and fixing top and the bottom that is separately positioned on support tube 7 with bottom end cover 8 of jacket, guarantee to be wrapped in and keep plumbness in the support tube 7, jacket is fixing to be connected on the plug 2 by bolt with upper end cover 6, and jacket is fixing to be connected on the jacket bottom 5 by bolt with bottom end cover 8.
Carry out hip treatment then, the technology of high temperature insostatic pressing (HIP) is: 900 ℃, and 5h, P 〉=120MPa;
(e) take out the jacket of finishing hip treatment in the jacket high temperature insostatic pressing (HIP) frock, the two ends of machining jacket then are to expose plug 2 and titanium alloy blind pipe blank 10 is as the criterion.As shown in Figure 3, process screw 1 and screw 2 11 respectively at the two ends of jacket then, screw 1 is opened on the plug 2, and screw 2 11 is opened on the titanium alloy blind pipe blank 10.Be connected a bolt respectively in screw 1 and the screw 21, be fixed on the hydraulic press with the two ends of bolt with jacket then, by hydraulic press the plug 2 in the jacket is extracted.
(f) the titanium alloy blind pipe blank 10 in the jacket is processed into the titanium alloy blind pipe.
The concrete manufacturing step of a kind of TC4 titanium alloy blind pipe manufacture method of the present invention is as follows:
(a) in plug 2 surface-coated graphite-like coatings as solder mask, the thickness δ value of graphite-like coating is 10mm.
This plug 2 adopts the low-carbon (LC) steel or stainless steel to make, and plug 2 is conehead for cylindric and front end.The diameter d of plug 2=D-2 δ, wherein D is titanium alloy blind pipe internal diameter, δ is the thickness of graphite-like coating on the plug 2.
(b) as shown in Figure 1, plug 2 is placed in the jacket tube 3, plug 2 is stuck in middle position in the jacket tube 3 by plug positioning tool 1, and the bottom of plug 2 is fixed on the jacket bottom 5, and jacket bottom 5 is welded on jacket tube 3 bottoms.Described plug positioning tool 1 is for being placed on the cylinder in the jacket tube 3, and outer, cylinder top is stuck in jacket tube 3 upper ends, and the cylinder bottom is stuck in the top of plug 2; Outer, top at plug positioning tool 1 has hole, adds dress titanium alloy powder 4 by these holes in the cavity that forms to the outer wall by the inwall of jacket tube 3 and plug 2.
After treating that titanium alloy powder 4 installs to 2/3 place that requires height, take out plug positioning tool 1, continue with titanium alloy powder 4 jacket tube 3 to be filled up.
(c) at jacket tube 3 welded top jacket top covers, reserve degasification line, the jacket tube is vacuumized, the vacuum in the jacket tube is higher than 3 * 10
-3During Pa, keep 8h, the sealing gas removing pipe;
(d) as shown in Figure 2, the two ends of step c gained being finished the jacket of degasification are fixed in the jacket high temperature insostatic pressing (HIP) frock.Described jacket high temperature insostatic pressing (HIP) frock comprises a support tube 7, jacket then is placed on the middle position of support tube 7, jacket is fixing with upper end cover 6 and fixing top and the bottom that is separately positioned on support tube 7 with bottom end cover 8 of jacket, guarantee to be wrapped in and keep plumbness in the support tube 7, jacket is fixing to be connected on the plug 2 by bolt with upper end cover 6, and jacket is fixing to be connected on the jacket bottom 5 by bolt with bottom end cover 8.
Carry out hip treatment then, the technology of high temperature insostatic pressing (HIP) is: 960 ℃, and 1h, P 〉=120MPa;
(e) take out the jacket of finishing hip treatment in the jacket high temperature insostatic pressing (HIP) frock, the two ends of machining jacket then are to expose plug 2 and titanium alloy blind pipe blank 10 is as the criterion.As shown in Figure 3, process screw 1 and screw 2 11 respectively at the two ends of jacket then, screw 1 is opened on the plug 2, and screw 2 11 is opened on the titanium alloy blind pipe blank 10.Be connected a bolt respectively in screw 1 and the screw 21, be fixed on the hydraulic press with the two ends of bolt with jacket then, by hydraulic press the plug 2 in the jacket is extracted.
(f) the titanium alloy blind pipe blank 10 in the jacket is processed into the titanium alloy blind pipe.
Claims (4)
1. the manufacture method of a Ti alloy with high performance blind pipe is characterized in that: adopt the high temperature insostatic pressing (HIP) near-net-shape method to make the titanium alloy blind pipe, specifically comprise the steps:
(a) in plug (2) surface-coated graphite-like coating as solder mask; The diameter d of this plug (2)=D-2 δ, wherein D is titanium alloy blind pipe internal diameter, δ is the thickness that plug (2) is gone up the graphite-like coating;
(b) plug (2) is placed in the jacket tube (3), plug (2) is stuck in the interior middle position of jacket tube (3) by plug positioning tool (1), the bottom of plug (2) is fixed on the jacket bottom (5), and jacket bottom (5) is welded on jacket tube (3) bottom; Add dress titanium alloy powder (4) in the cavity that forms to the outer wall by the inwall of jacket tube (3) and plug (2) then;
After treating that titanium alloy powder (4) installs to 1/2～2/3 place that requires height, take out plug positioning tool (1), continue with titanium alloy powder (4) jacket tube (3) to be filled up;
(c) at jacket tube (3) welded top jacket top cover, reserve degasification line, the jacket tube is vacuumized, the vacuum in the jacket tube is higher than 3 * 10
-3During Pa, keep 6～8h, the sealing gas removing pipe;
(d) two ends of step (c) gained being finished the jacket of degasification are fixed in the jacket high temperature insostatic pressing (HIP) frock; Carry out hip treatment then, the technology of high temperature insostatic pressing (HIP) is: 900～960 ℃, and 1～5h, P 〉=120MPa;
(e) take out the jacket of finishing hip treatment in the jacket high temperature insostatic pressing (HIP) frock, the two ends of machining jacket then are to expose plug (2) and titanium alloy blind pipe blank (10) is as the criterion; Process screw one (9) and screw two (11) then respectively at the two ends of jacket, be connected a bolt respectively in screw one (9) and the screw two (11), be fixed on the hydraulic press with the two ends of bolt with jacket then, by hydraulic press the plug in the jacket (2) extracted;
(f) the titanium alloy blind pipe blank (10) in the jacket is processed into the titanium alloy blind pipe;
Described plug positioning tool (1) for can be placed on jacket tube (3) in, the cylinder coaxial with the jacket tube, outer, cylinder top is stuck on the jacket tube (3), the cylinder bottom is stuck in the top of plug (2); Outer, top at plug positioning tool (1) has hole, adds dress titanium alloy powder (4) by these holes in the cavity of jacket tube (3) and plug (2) formation;
Described jacket high temperature insostatic pressing (HIP) frock comprises a support tube (7), jacket then is placed on the middle position of support tube (7), jacket is fixing with upper end cover (6) and fixing top and the bottom that is separately positioned on support tube (7) with bottom end cover (8) of jacket, guarantee to be wrapped in and keep plumbness in the support tube (7), jacket is fixing to be connected on the plug (2) by bolt with upper end cover (6), and jacket is fixing to be connected on the jacket bottom (5) by bolt with bottom end cover (8).
2. the manufacture method of a kind of Ti alloy with high performance blind pipe according to claim 1, it is characterized in that: the described screw one (9) of step (e) is opened on the plug (2), and screw two (11) is opened on the titanium alloy blind pipe blank (10).
3. the manufacture method of a kind of Ti alloy with high performance blind pipe according to claim 1 is characterized in that: described plug (2) adopts the low-carbon (LC) steel or stainless steel to make, and plug (2) is conehead for cylindric and front end.
4. the manufacture method of a kind of Ti alloy with high performance blind pipe according to claim 1, it is characterized in that: the thickness δ value of described graphite-like coating is: 2mm≤δ≤10mm.
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| CN103071791B (en) * | 2013-01-18 | 2015-02-11 | 航天材料及工艺研究所 | Forming method of TiAl pipe target material in large length-diameter ratio |
| CN103212912B (en) * | 2013-04-22 | 2015-03-04 | 安泰科技股份有限公司 | Method for manufacturing nuclear-power-used thrust disc by means of hot isostatic pressing diffusion bonding |
| CN104889398A (en) * | 2015-05-15 | 2015-09-09 | 安泰科技股份有限公司 | Anti-abrasion anti-etching alloy rod production method through powder metallurgy process |
| CN104889399B (en) * | 2015-05-15 | 2017-10-10 | 安泰科技股份有限公司 | The method that powder metallurgical technique prepares antifriction anticorrosion alloy pipe fitting |
| CN105436505B (en) * | 2015-11-14 | 2017-10-13 | 华中科技大学 | A kind of high temperature insostatic pressing (HIP) manufacturing process for being used to improve surface quality of workpieces |
| CN106111992B (en) * | 2016-06-23 | 2018-09-18 | 航天材料及工艺研究所 | A kind of the evenness of wall thickness control tooling and method of hot isostatic pressing powder metallurgy thin wall component |
| CN109128155B (en) * | 2018-08-02 | 2024-02-06 | 重庆材料研究院有限公司 | Method for manufacturing blind pipe by powder metallurgy isostatic pressing |
| CN109158605B (en) * | 2018-08-24 | 2021-05-25 | 中国航空工业集团公司沈阳飞机设计研究所 | Method for manufacturing integrated structure of outer cylinder and diagonal brace of aircraft landing gear |
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| JPS58171505A (en) * | 1982-04-01 | 1983-10-08 | Toshiba Corp | Production of metallic tube having high melting point |
| JPS60255904A (en) * | 1984-06-01 | 1985-12-17 | Hitachi Metals Ltd | Manufacture of shape memory alloy pipe |
| CN1239284C (en) * | 2001-12-03 | 2006-02-01 | 北京有色金属研究总院 | Method for directly preparing TiNi shape memory alloy pipe joint from element powders |
| GB0805242D0 (en) * | 2008-03-20 | 2008-04-30 | Advanced Interactive Materials | Net-shape or near net-shape powder isostatic pressing process |
| CN101579741B (en) * | 2009-06-04 | 2011-03-02 | 航天材料及工艺研究所 | Manufacturing method of large size thin-walled titanium alloy cylindrical part and cylindrical mould |
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