CN102389900A - High-precision processing method for Ti-3Al-2.5V (TA18) aviation titanium tube - Google Patents
High-precision processing method for Ti-3Al-2.5V (TA18) aviation titanium tube Download PDFInfo
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Abstract
The invention discloses a high-precision processing method for a Ti-3Al-2.5V (TA18) aviation titanium tube, which comprises the following steps: (I) straightening a TA18 tube blank; (II) evenly smearing the inner wall of the tube blank by using chlorcosane-52, and putting a first core rod into the tube blank and rolling into a semi-finished tubular product with required dimensions; (III) taking out the first core rod in the semi-finished tubular product, smearing the semi-finished tubular product by using the chlorcosane-52, and then, putting a second core rod into the semi-finished tubular product and rolling into a tubular product with the required dimensions; and (IV) repeating the step (III) for 1-8 times to obtain the TA18 aviation titanium tube. The high-precision processing method for the TA18 aviation titanium tube is realized through a cold rolling process, and has a simple and feasible technology and lower cost. The roughness Ra of the outer surface of the TA18 aviation titanium tube processed by adopting the method disclosed by the invention is not greater than 0.8mu m, the roughness Ra of the inner surface is not greater than 1.6mu m, the external diameter dimensional tolerance is not greater than 0.05mm, the internal diameter dimensional tolerance is not greater than 0.04mm, and the wall thickness dimensional tolerance is not greater than 5 percent of the wall thickness nominal dimension, thereby, the application requirement of the high-precision processing method for the TA18 aviation titanium tube in the field of aerospace industry is met.
Description
Technical field
The invention belongs to the titanium alloy pipe technical field, be specifically related to a kind of high-precision processing method of TA18 aviation titanium pipe.
Background technology
TA18 (Ti-3Al-2.5V) alloy is the alpha and beta type titan alloy of the nearly α of low alloying.It not only has good room temperature, high-temperature mechanical property and corrosion resisting property, and has excellent hot and cold processing technology plasticity, mouldability and welding performance.Therefore it becomes the preferred material of Aero-Space pipe-line system with the excellent comprehensive performance.In recent years, along with the continuous development of China's aerospace industry, the demand of high-performance TA18 tubing is more and more urgent.
Domestic middle nineteen seventies begins the TA18 alloy to be studied, and at present domestic have ripe production technology to strong tubing among the intensity rank 620MPa.In recent years, along with the development of aircraft industry, the TA18 tubing of middle intensity level can not satisfy the demands, and the performance of TA18 tubing has been proposed more high-intensity requirement, requires tensile strength more than or equal to 862MPa, and yield strength is more than or equal to 724MPa; Then have higher requirement for surface roughness and dimensional accuracy: the roughness of pipe outer surface is Ra≤0.8 μ m, and the roughness of inner surface is Ra≤1.6 μ m; The external diameter of tubing and internal diameter size tolerance are 0.05mm～0.10mm, and wall thickness then requires>=0.95t (t is a nominal wall thickness).This requirement is general industry 2 times with tubing ASTMB 338 standards.
Lean on dimensional accuracy and surface roughness and the YIELD STRENGTH of plastic deformation material processed closely related; When intensity improves; Because the influence of process equipment, mould strain; Die surface will bear bigger contact stress, and lubricating condition worsens more, and the dimensional accuracy of tubing and Roughness Surface on Control have bigger difficulty.Domestic present processing technology to high strength TA18 tubing still is in the research.
Summary of the invention
Technical problem to be solved by this invention is the deficiency to above-mentioned prior art, and a kind of high-precision processing method of TA18 aviation titanium pipe is provided.Adopt the roughness Ra≤0.8 μ m of the TA18 aviation titanium tube outer surface of this method processing; The roughness of inner surface is Ra≤1.6 μ m; The outside dimension tolerance is not more than 0.05mm; The internal diameter size tolerance is not more than 0.04mm, and the wall thickness dimension tolerance is not more than 5% of wall thickness nominal size, satisfies its application requirements in the aerospace industry field.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of high-precision processing method of TA18 aviation titanium pipe is characterized in that this method may further comprise the steps:
Step 3, first plug in the tubing of semi-finished product described in the step 2 is taken out; Then chlorinated paraffin-52 is poured in the semi-finished product tubing; Rotation semi-finished product tubing makes semi-finished product tubing inwall evenly smear chlorinated paraffin-52; Second plug is packed in the semi-finished product tubing, the semi-finished product tubing that second plug will be housed in the 20min after pouring into chlorinated paraffin-52 is sent into the tubing that is rolled into required size in the milling train again; Adopt lubricant that titanium alloy drawing oil extreme pressure agent 129921 and No. 46 machine oil mixes according to 1: 9 volume ratio as the outer wall lubricant in the said operation of rolling, and the flow of controlling the outer wall lubricant is 50L/min～80L/min; The diameter of said second plug is littler by 0.2%～0.5% than the internal diameter of tubing, and the zone of the last distance of the second sizing section L2 of second plug second plug end 20mm～80mm has 0.004～0.008 tapering;
Step 4, repeating step 3 1～8 times obtain the external diameter tolerance and are not more than 0.05mm, and id tolerance is not more than 0.04mm, and wall thickness tolerance is not more than 5% TA18 aviation titanium pipe of wall thickness nominal size.
The high-precision processing method of above-mentioned a kind of TA18 aviation titanium pipe, the wall thickness tolerance of the pipe of TA18 described in the step 1 are not more than 1.5 times of TA18 aviation titanium thickness of pipe wall tolerance.
The high-precision processing method of above-mentioned a kind of TA18 aviation titanium pipe; The dimensional accuracy of first plug described in the step 2 is IT5 level or IT6 level; The form and position tolerance precision of first plug is IT4 level or IT5 level; The surface roughness Ra of first plug≤0.8 μ m, the hardness of first plug is 58HRC～62HRC.
The high-precision processing method of above-mentioned a kind of TA18 aviation titanium pipe; The dimensional accuracy of second plug described in the step 3 is IT5 level or IT6 level; The form and position tolerance precision of second plug is IT4 level or IT5 level; The surface roughness Ra of second plug≤0.8 μ m, the hardness of second plug is 58HRC～62HRC.
The high-precision processing method of above-mentioned a kind of TA18 aviation titanium pipe; The speed of rolling of milling train described in step 2 and the step 3 is 40 times/minute～60 times/minute; The feed of milling train is 2mm/ time～4mm/ time; The slideway sizing section of milling train all has 0.003～0.005 gradient, and the roller opening degree of depth of milling train is along roll short transverse 2mm～4mm.
The high-precision processing method of above-mentioned a kind of TA18 aviation titanium pipe; The dimensional accuracy of said roll is IT5 level or IT6 level; The form and position tolerance precision of roll is IT4 level or IT5 level, the surface roughness Ra of roll≤0.8 μ m, and the hardness of roll is 58HRC～62HRC.
The high-precision processing method of above-mentioned a kind of TA18 aviation titanium pipe, the dimensional accuracy of said slideway is IT5 level or IT6 level, the form and position tolerance precision of slideway is IT4 level or IT5 level, the surface roughness Ra of slideway≤0.8 μ m, the hardness of slideway is 58HRC～62HRC.
The high-precision processing method of above-mentioned a kind of TA18 aviation titanium pipe; The selection principle of milling train described in the step 2 is: when the size of semi-finished product tubing falls in the size range of two kinds of dimension series milling trains, select the milling train of reduced size series in two kinds of dimension serieses for use.
The high-precision processing method of above-mentioned a kind of TA18 aviation titanium pipe, the selection principle of milling train described in the step 3 is: when the size of tubing falls in the size range of two kinds of dimension series milling trains, select the milling train of reduced size series in two kinds of dimension serieses for use.
The present invention compared with prior art has the following advantages:
1, the present invention realizes through cold-rolling process, technological simple possible, and cost is lower.
2, mainly through the technical parameter of control mould, dimensional accuracy, opening size, the surface roughness of promptly controlling mould realize that lower to operating personnel's requirement, operability is higher in the present invention.
3, the wall thickness tolerance of the trade mark flow of the specification stroke of size and the opening parameter of the present invention through the Comprehensive Control mould, milling train, lubricant, pipe and roll dimensional accuracy and the surface roughness that speed, feed reach desired tubing when rolling; The size of pipe and tubing of producing is stable, can make any cross section of tubing all reach requirement.
4, adopt the roughness Ra≤0.8 μ m of the TA18 aviation titanium tube outer surface of the inventive method processing; The roughness of inner surface is Ra≤1.6 μ m; The outside dimension tolerance is not more than 0.05mm; The internal diameter size tolerance is not more than 0.04mm, and the wall thickness dimension tolerance is not more than 5% of wall thickness nominal size, satisfies its application requirements in the aerospace industry field.
5, the present invention is applicable to tensile strength >=862MPa, yield strength >=724MPa, the production of the TA18 aviation titanium pipe of high dimensional accuracy, low surface roughness.
Through embodiment, technical scheme of the present invention is done further detailed description below.
Description of drawings
Fig. 1 is the pipe of the present invention and the first plug assembled construction sketch map.
Fig. 2 is the semi-finished product tubing of the present invention and the second plug assembled construction sketch map.
Description of reference numerals:
The 1-pipe; 2-first plug; 3-semi-finished product tubing;
4-second plug.
The specific embodiment
In the present embodiment, the wall thickness tolerance of said TA18 pipe is not more than 1.5 times of TA18 aviation titanium thickness of pipe wall tolerance;
In the present embodiment, the dimensional accuracy of said first plug 2 is the IT5 level, and the form and position tolerance precision of first plug 2 is the IT4 level, the surface roughness Ra of first plug 2≤0.8 μ m, and the hardness of first plug 2 is 58HRC～62HRC; The speed of rolling of said milling train is 40 times/minute, and the feed of milling train is 2mm/ time, and the slideway sizing section of milling train has 0.005 gradient, and the roller opening degree of depth of milling train is along roll short transverse 2mm; The dimensional accuracy of said roll is the IT5 level, and the form and position tolerance precision of roll is the IT4 level, the surface roughness Ra of roll≤0.8 μ m, and the hardness of roll is 58HRC～62HRC; The dimensional accuracy of said slideway is the IT5 level, and the form and position tolerance precision of slideway is the IT4 level, the surface roughness Ra of slideway≤0.8 μ m, and the hardness of slideway is 58HRC～62HRC; The selection principle of said milling train is: when the size of semi-finished product tubing falls in the size range of two kinds of dimension series milling trains, select the milling train of reduced size series in two kinds of dimension serieses for use;
Step 3, first plug 2 in the tubing of semi-finished product described in the step 23 is taken out; Then chlorinated paraffin-52 is poured in the semi-finished product tubing 3; Rotation semi-finished product tubing 3 makes semi-finished product tubing 3 inwalls evenly smear chlorinated paraffin-52; Second plug 4 is packed in the semi-finished product tubing 3, the semi-finished product tubing 3 that second plug 4 will be housed in the 20min after pouring into chlorinated paraffin-52 is sent into and is rolled into tubing (external diameter 22mm, wall thickness 3mm) in the milling train again; Adopt lubricant that titanium alloy drawing oil extreme pressure agent 129921 (cloud Qinghua, Weihai, Shandong worker develops institute and produces) and No. 46 machine oil mixes according to 1: 9 volume ratio as the outer wall lubricant in the said operation of rolling, and the flow of control outer wall lubricant is 50L/min; The diameter of said second plug 4 (15.92mm) is littler by 0.5% than the internal diameter of tubing, and the zone of the last distance of the second sizing section L2 of second plug 4 second plug 4 end 20mm has 0.008 tapering; (semi-finished product tubing 3 and second plug, 4 assembled construction sketch mapes are as shown in Figure 2);
In the present embodiment, the dimensional accuracy of said second plug 4 is the IT5 level, and the form and position tolerance precision of second plug 4 is the IT4 level, the surface roughness Ra of second plug 4≤0.8 μ m, and the hardness of second plug 4 is 58HRC～62HRC; The speed of rolling of said milling train is 40 times/minute, and the feed of milling train is 2mm/ time, and the slideway sizing section of milling train has 0.005 gradient, and the roller opening degree of depth of milling train is along roll short transverse 2mm; The dimensional accuracy of said roll is the IT5 level, and the form and position tolerance precision of roll is the IT4 level, the surface roughness Ra of roll≤0.8 μ m, and the hardness of roll is 58HRC～62HRC; The dimensional accuracy of said slideway is the IT5 level, and the form and position tolerance precision of slideway is the IT4 level, the surface roughness Ra of slideway≤0.8 μ m, and the hardness of slideway is 58HRC～62HRC; The selection principle of said milling train is: when the size of tubing falls in the size range of two kinds of dimension series milling trains, select the milling train of reduced size series in two kinds of dimension serieses for use;
Step 4, repeating step 38 times obtain the external diameter tolerance and are not more than 0.05mm, and id tolerance is not more than 0.04mm, and wall thickness tolerance is not more than 5% TA18 aviation titanium pipe (external diameter 6mm, wall thickness 1mm) of wall thickness nominal size.
Roughness Ra≤0.8 μ the m of the TA18 aviation titanium tube outer surface of present embodiment processing; The roughness of inner surface is Ra≤1.6 μ m; The outside dimension tolerance is not more than 0.05mm; The internal diameter size tolerance is not more than 0.04mm, and the wall thickness dimension tolerance is not more than 5% of wall thickness nominal size, satisfies the requirement of aerospace industry field to TA18 titanium pipe.
In the present embodiment, the wall thickness tolerance of said TA18 pipe is not more than 1.5 times of TA18 aviation titanium thickness of pipe wall tolerance;
In the present embodiment, the dimensional accuracy of said first plug 2 is the IT5 level, and the form and position tolerance precision of first plug 2 is the IT5 level, the surface roughness Ra of first plug 2≤0.8 μ m, and the hardness of first plug 2 is 58HRC～62HRC; The speed of rolling of said milling train is 60 times/minute, and the feed of milling train is 4mm/ time, and the slideway sizing section of milling train has 0.003 gradient, and the roller opening degree of depth of milling train is along roll short transverse 4mm; The dimensional accuracy of said roll is the IT5 level, and the form and position tolerance precision of roll is the IT5 level, the surface roughness Ra of roll≤0.8 μ m, and the hardness of roll is 58HRC～62HRC; The dimensional accuracy of said slideway is the IT5 level, and the form and position tolerance precision of slideway is the IT5 level, the surface roughness Ra of slideway≤0.8 μ m, and the hardness of slideway is 58HRC～62HRC; The selection principle of said milling train is: when the size of semi-finished product tubing falls in the size range of two kinds of dimension series milling trains, select the milling train of reduced size series in two kinds of dimension serieses for use;
Step 3, first plug 2 in the tubing of semi-finished product described in the step 23 is taken out; Then chlorinated paraffin-52 is poured in the semi-finished product tubing 3; Rotation semi-finished product tubing 3 makes semi-finished product tubing 3 inwalls evenly smear chlorinated paraffin-52; Second plug 4 is packed in the semi-finished product tubing 3, the semi-finished product tubing 3 that second plug 4 will be housed in the 20min after pouring into chlorinated paraffin-52 is sent into the tubing (external diameter 19mm, wall thickness 2mm) that is rolled into required size in the milling train again; Adopt lubricant that titanium alloy drawing oil extreme pressure agent 129921 (cloud Qinghua, Weihai, Shandong worker develops institute and produces) and No. 46 machine oil mixes according to 1: 9 volume ratio as the outer wall lubricant in the said operation of rolling, and the flow of control outer wall lubricant is 80L/min; The diameter of said second plug 4 (14.97mm) is littler by 0.2% than the internal diameter of tubing, and the zone of the last distance of the second sizing section L2 of second plug 4 second plug 4 end 80mm has 0.004 tapering; (semi-finished product tubing 3 and second plug, 4 assembled construction sketch mapes are as shown in Figure 2);
In the present embodiment, the dimensional accuracy of said second plug 4 is the IT5 level, and the form and position tolerance precision of second plug 4 is the IT5 level, the surface roughness Ra of second plug 4≤0.8 μ m, and the hardness of second plug 4 is 58HRC～62HRC; The speed of rolling of said milling train is 60 times/minute, and the feed of milling train is 4mm/ time, and the slideway sizing section of milling train has 0.003 gradient, and the roller opening degree of depth of milling train is along roll short transverse 4mm; The dimensional accuracy of said roll is the IT5 level, and the form and position tolerance precision of roll is the IT5 level, the surface roughness Ra of roll≤0.8 μ m, and the hardness of roll is 58HRC～62HRC; The dimensional accuracy of said slideway is the IT5 level, and the form and position tolerance precision of slideway is the IT5 level, the surface roughness Ra of slideway≤0.8 μ m, and the hardness of slideway is 58HRC～62HRC; The selection principle of said milling train is: when the size of tubing falls in the size range of two kinds of dimension series milling trains, select the milling train of reduced size series in two kinds of dimension serieses for use;
Step 4, repeating step 33 times obtain the external diameter tolerance and are not more than 0.05mm, and id tolerance is not more than 0.04mm, and wall thickness tolerance is not more than 5% TA18 aviation titanium pipe (external diameter 12mm, wall thickness 1mm) of wall thickness nominal size.
Roughness Ra≤0.8 μ the m of the TA18 aviation titanium tube outer surface of present embodiment processing; The roughness of inner surface is Ra≤1.6 μ m; The outside dimension tolerance is not more than 0.05mm; The internal diameter size tolerance is not more than 0.04mm, and the wall thickness dimension tolerance is not more than 5% of wall thickness nominal size, satisfies the requirement of aerospace industry field to TA18 titanium pipe.
Embodiment 3
In the present embodiment, the wall thickness tolerance of said TA18 pipe is not more than 1.5 times of TA18 aviation titanium thickness of pipe wall tolerance;
In the present embodiment, the dimensional accuracy of said first plug 2 is the IT6 level, and the form and position tolerance precision of first plug 2 is the IT5 level, the surface roughness Ra of first plug 2≤0.8 μ m, and the hardness of first plug 2 is 58HRC～62HRC; The speed of rolling of said milling train is 50 times/minute, and the feed of milling train is 3mm/ time, and the slideway sizing section of milling train has 0.004 gradient, and the roller opening degree of depth of milling train is along roll short transverse 3mm; The dimensional accuracy of said roll is the IT6 level, and the form and position tolerance precision of roll is the IT5 level, the surface roughness Ra of roll≤0.8 μ m, and the hardness of roll is 58HRC～62HRC; The dimensional accuracy of said slideway is the IT6 level, and the form and position tolerance precision of slideway is the IT5 level, the surface roughness Ra of slideway≤0.8 μ m, and the hardness of slideway is 58HRC～62HRC; The selection principle of said milling train is: when the size of semi-finished product tubing falls in the size range of two kinds of dimension series milling trains, select the milling train of reduced size series in two kinds of dimension serieses for use;
Step 3, first plug 2 in the tubing of semi-finished product described in the step 23 is taken out; Then chlorinated paraffin-52 is poured in the semi-finished product tubing 3; Rotation semi-finished product tubing 3 makes semi-finished product tubing 3 inwalls evenly smear chlorinated paraffin-52; Second plug 4 is packed in the semi-finished product tubing, the semi-finished product tubing 3 that second plug 4 will be housed in the 20min after pouring into chlorinated paraffin-52 is sent into the tubing (external diameter 22mm, wall thickness 2.5mm) that is rolled into required size in the milling train again; Adopt lubricant that titanium alloy drawing oil extreme pressure agent 129921 (cloud Qinghua, Weihai, Shandong worker develops institute and produces) and No. 46 machine oil mixes according to 1: 9 volume ratio as the outer wall lubricant in the said operation of rolling, and the flow of control outer wall lubricant is 70L/min; The diameter of said second plug 4 (16.93mm) is littler by 0.4% than the internal diameter of tubing, and the zone of the last distance of the second sizing section L2 of second plug 4 second plug 4 end 50mm has 0.006 tapering; (semi-finished product tubing 3 and second plug, 4 assembled construction sketch mapes are as shown in Figure 2);
In the present embodiment, the dimensional accuracy of said second plug 4 is the IT5 level, and the form and position tolerance precision of second plug 4 is the IT5 level, the surface roughness Ra of second plug 4≤0.8 μ m, and the hardness of second plug 4 is 58HRC～62HRC; The speed of rolling of said milling train is 60 times/minute, and the feed of milling train is 4mm/ time, and the slideway sizing section of milling train has 0.003 gradient, and the roller opening degree of depth of milling train is along roll short transverse 4mm; The dimensional accuracy of said roll is the IT5 level, and the form and position tolerance precision of roll is the IT5 level, the surface roughness Ra of roll≤0.8 μ m, and the hardness of roll is 58HRC～62HRC; The dimensional accuracy of said slideway is the IT5 level, and the form and position tolerance precision of slideway is the IT5 level, the surface roughness Ra of slideway≤0.8 μ m, and the hardness of slideway is 58HRC～62HRC; The selection principle of said milling train is: when the size of tubing falls in the size range of two kinds of dimension series milling trains, select the milling train of reduced size series in two kinds of dimension serieses for use;
Step 4, repeating step 31 times obtain the external diameter tolerance and are not more than 0.05mm, and id tolerance is not more than 0.04mm, and wall thickness tolerance is not more than 5% TA18 aviation titanium pipe (external diameter 20mm, wall thickness 1.8mm) of wall thickness nominal size.
Roughness Ra≤0.8 μ the m of the TA18 aviation titanium tube outer surface of present embodiment processing; The roughness of inner surface is Ra≤1.6 μ m; The outside dimension tolerance is not more than 0.05mm; The internal diameter size tolerance is not more than 0.04mm, and the wall thickness dimension tolerance is not more than 5% of wall thickness nominal size, satisfies the requirement of aerospace industry field to TA18 titanium pipe.
Embodiment 4
In the present embodiment, the wall thickness tolerance of said TA18 pipe is not more than 1.5 times of TA18 aviation titanium thickness of pipe wall tolerance;
In the present embodiment, the dimensional accuracy of said first plug 2 is the IT5 level, and the form and position tolerance precision of first plug 2 is the IT4 level, the surface roughness Ra of first plug 2≤0.8 μ m, and the hardness of first plug 2 is 58HRC～62HRC; The speed of rolling of said milling train is 40 times/minute, and the feed of milling train is 4mm/ time, and the slideway sizing section of milling train has 0.005 gradient, and the roller opening degree of depth of milling train is along roll short transverse 2mm; The dimensional accuracy of said roll is the IT5 level, and the form and position tolerance precision of roll is the IT5 level, the surface roughness Ra of roll≤0.8 μ m, and the hardness of roll is 58HRC～62HRC; The dimensional accuracy of said slideway is the IT5 level, and the form and position tolerance precision of slideway is the IT5 level, the surface roughness Ra of slideway≤0.8 μ m, and the hardness of slideway is 58HRC～62HRC; The selection principle of said milling train is: when the size of semi-finished product tubing falls in the size range of two kinds of dimension series milling trains, select the milling train of reduced size series in two kinds of dimension serieses for use;
Step 3, first plug 2 in the tubing of semi-finished product described in the step 23 is taken out; Then chlorinated paraffin-52 is poured in the semi-finished product tubing 3; Rotation semi-finished product tubing 3 makes semi-finished product tubing 3 inwalls evenly smear chlorinated paraffin-52; Second plug 4 is packed in the semi-finished product tubing 3, the semi-finished product tubing 3 that second plug 4 will be housed in the 20min after pouring into chlorinated paraffin-52 is sent into the tubing (external diameter 14mm, wall thickness 1.2mm) that is rolled into required size in the milling train again; Adopt lubricant that titanium alloy drawing oil extreme pressure agent 129921 (cloud Qinghua, Weihai, Shandong worker develops institute and produces) and No. 46 machine oil mixes according to 1: 9 volume ratio as the outer wall lubricant in the said operation of rolling, and the flow of control outer wall lubricant is 50L/min; The diameter of said second plug 4 (11.57mm) is littler by 0.3% than the internal diameter of tubing, and the zone of the last distance of the second sizing section L2 of second plug 4 second plug 4 end 70mm has 0.005 tapering; (semi-finished product tubing 3 and second plug, 4 assembled construction sketch mapes are as shown in Figure 2);
In the present embodiment, the dimensional accuracy of said second plug 4 is the IT6 level, and the form and position tolerance precision of second plug 4 is the IT5 level, the surface roughness Ra of second plug 4≤0.8 μ m, and the hardness of second plug 4 is 58HRC～62HRC; The speed of rolling of said milling train is 60 times/minute, and the feed of milling train is 4mm/ time, and the slideway sizing section of milling train has 0.005 gradient, and the roller opening degree of depth of milling train is along roll short transverse 3mm; The dimensional accuracy of said roll is the IT5 level, and the form and position tolerance precision of roll is the IT5 level, the surface roughness Ra of roll≤0.8 μ m, and the hardness of roll is 58HRC～62HRC; The dimensional accuracy of said slideway is the IT5 level, and the form and position tolerance precision of slideway is the IT5 level, the surface roughness Ra of slideway≤0.8 μ m, and the hardness of slideway is 58HRC～62HRC; The selection principle of said milling train is: when the size of tubing falls in the size range of two kinds of dimension series milling trains, select the milling train of reduced size series in two kinds of dimension serieses for use;
Step 4, repeating step 34 times obtain the external diameter tolerance and are not more than 0.05mm, and id tolerance is not more than 0.04mm, and wall thickness tolerance is not more than 5% TA18 aviation titanium pipe (external diameter 6mm, wall thickness 0.5mm) of wall thickness nominal size.
Roughness Ra≤0.8 μ the m of the TA18 aviation titanium tube outer surface of present embodiment processing; The roughness of inner surface is Ra≤1.6 μ m; The outside dimension tolerance is not more than 0.05mm; The internal diameter size tolerance is not more than 0.04mm, and the wall thickness dimension tolerance is not more than 5% of wall thickness nominal size, satisfies the requirement of aerospace industry field to TA18 titanium pipe.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any restriction, every according to inventing technical spirit to any simple modification, change and equivalent structure variation that above embodiment did, all still belong in the protection domain of technical scheme of the present invention.
Claims (9)
1. the high-precision processing method of a TA18 aviation titanium pipe is characterized in that this method may further comprise the steps:
Step 1, the TA18 pipe is carried out straightening processing, the linearity that makes pipe is 5mm/m～6mm/m;
Step 2, chlorinated paraffin-52 is poured in the step 1 in the pipe after straightening processing (1); Rotation pipe (1) makes pipe (1) inwall evenly smear chlorinated paraffin-52; Then first plug (2) is packed in the pipe (1), the pipe (1) that first plug (2) will be housed in the 20min after pouring into chlorinated paraffin-52 is sent into the semi-finished product tubing (3) that is rolled into required size in the milling train; Adopt lubricant that titanium alloy drawing oil extreme pressure agent 129921 and No. 46 machine oil mixes according to 1: 9 volume ratio as the outer wall lubricant in the said operation of rolling, and the flow of controlling the outer wall lubricant is 50L/min～80L/min; The diameter of said first plug (2) is littler by 0.2%～0.5% than the internal diameter of semi-finished product tubing (3), and the zone of the last distance of the first sizing section L1 of first plug (2) first plug (2) end 20mm～80mm has 0.004～0.008 tapering;
Step 3, first plug (2) in the tubing of semi-finished product described in the step 2 (3) is taken out; Then chlorinated paraffin-52 is poured in the semi-finished product tubing (3); Rotation semi-finished product tubing (3) make semi-finished product tubing (3) inwall evenly smear chlorinated paraffin-52; Second plug (4) is packed in the semi-finished product tubing (3), the semi-finished product tubing (3) that second plug (4) will be housed in the 20min after pouring into chlorinated paraffin-52 is sent into the tubing that is rolled into required size in the milling train again; Adopt lubricant that titanium alloy drawing oil extreme pressure agent 129921 and No. 46 machine oil mixes according to 1: 9 volume ratio as the outer wall lubricant in the said operation of rolling, and the flow of controlling the outer wall lubricant is 50L/min～80L/min; The diameter of said second plug (4) is littler by 0.2%～0.5% than the internal diameter of tubing, and the zone of the last distance of the second sizing section L2 of second plug (4) second plug (4) end 20mm～80mm has 0.004～0.008 tapering;
Step 4, repeating step 3 1～8 times obtain the external diameter tolerance and are not more than 0.05mm, and id tolerance is not more than 0.04mm, and wall thickness tolerance is not more than 5% TA18 aviation titanium pipe of wall thickness nominal size.
2. the high-precision processing method of a kind of TA18 aviation titanium pipe according to claim 1 is characterized in that, the wall thickness tolerance of the pipe of TA18 described in the step 1 is not more than 1.5 times of TA18 aviation titanium thickness of pipe wall tolerance.
3. the high-precision processing method of a kind of TA18 aviation titanium pipe according to claim 1; It is characterized in that; The dimensional accuracy of first plug described in the step 2 (2) is IT5 level or IT6 level; The form and position tolerance precision of first plug (2) is IT4 level or IT5 level, the surface roughness Ra of first plug (2)≤0.8 μ m, and the hardness of first plug (2) is 58HRC～62HRC.
4. the high-precision processing method of a kind of TA18 aviation titanium pipe according to claim 1; It is characterized in that; The dimensional accuracy of second plug described in the step 3 (4) is IT5 level or IT6 level; The form and position tolerance precision of second plug (4) is IT4 level or IT5 level, the surface roughness Ra of second plug (4)≤0.8 μ m, and the hardness of second plug (4) is 58HRC～62HRC.
5. the high-precision processing method of a kind of TA18 aviation titanium pipe according to claim 1; It is characterized in that; The speed of rolling of milling train described in step 2 and the step 3 is 40 times/minute～60 times/minute; The feed of milling train is 2mm/ time～4mm/ time, and the slideway sizing section of milling train all has 0.003～0.005 gradient, and the roller opening degree of depth of milling train is along roll short transverse 2mm～4mm.
6. the high-precision processing method of a kind of TA18 aviation titanium pipe according to claim 5; It is characterized in that; The dimensional accuracy of said roll is IT5 level or IT6 level; The form and position tolerance precision of roll is IT4 level or IT5 level, the surface roughness Ra of roll≤0.8 μ m, and the hardness of roll is 58HRC～62HRC.
7. the high-precision processing method of a kind of TA18 aviation titanium pipe according to claim 5; It is characterized in that; The dimensional accuracy of said slideway is IT5 level or IT6 level; The form and position tolerance precision of slideway is IT4 level or IT5 level, the surface roughness Ra of slideway≤0.8 μ m, and the hardness of slideway is 58HRC～62HRC.
8. the high-precision processing method of a kind of TA18 aviation titanium pipe according to claim 1; It is characterized in that; The selection principle of milling train described in the step 2 is: when the size of semi-finished product tubing falls in the size range of two kinds of dimension series milling trains, select the milling train of reduced size series in two kinds of dimension serieses for use.
9. the high-precision processing method of a kind of TA18 aviation titanium pipe according to claim 1; It is characterized in that; The selection principle of milling train described in the step 3 is: when the size of tubing falls in the size range of two kinds of dimension series milling trains, select the milling train of reduced size series in two kinds of dimension serieses for use.
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