CN104923733B - The casting method of titanium or titanium alloy casting with irregularly-shaped inner hole - Google Patents
The casting method of titanium or titanium alloy casting with irregularly-shaped inner hole Download PDFInfo
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- CN104923733B CN104923733B CN201510250731.6A CN201510250731A CN104923733B CN 104923733 B CN104923733 B CN 104923733B CN 201510250731 A CN201510250731 A CN 201510250731A CN 104923733 B CN104923733 B CN 104923733B
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Abstract
The invention belongs to casting technology field, is related to the improvement to the titanium with irregularly-shaped inner hole or titanium alloy casting casting method.Characterized in that, it is as follows to carry out the step of casting of titanium or titanium alloy casting, casting using investment casting method：Prepare mosaics；Compacting wax pattern；Shell processed；Cast；Cutting.The invention provides a kind of improved titanium or titanium alloy casting casting method with irregularly-shaped inner hole, the depoling hardly possible occurred when being avoided that using ceramic core method, high cost, the low problem of efficiency；Simultaneously, it is ensured that the performance of foundry goods and the reliability for using.
Description
Technical field
The invention belongs to casting technology field, is related to the titanium of irregularly-shaped inner hole or changing for titanium alloy casting casting method
Enter.
Background technology
With industrial expansion, the body of titanium alloy casting and structure tends to large-scale, entirety and thin-walled direction is developed, to casting
The titanium alloy casting that making technique productions has complicated inner cavity proposes higher requirement.Fig. 1 is a kind of titanium with irregularly-shaped inner hole or titanium
The partial sectional view of alloy-steel casting, has irregularly-shaped inner hole 1a in the inside of foundry goods 1.For molding irregularly-shaped inner hole 1a, generally, titanium alloy
The complicated inner cavity of foundry goods mainly has two kinds of forming modes：The first, ceramic core method, have the preset pottery in the position of inner chamber in foundry goods
Core, removes after casting forming.Which has the disadvantage：Easily there is depoling hardly possible, high cost, the low problem of efficiency in the method.Secondth,
Metallic core method, metal tube is pre-installed in casting mold, makes molten metal and mosaics molten using casting pouring cavity filling process
An entirety is combined into, and the inner chamber of metal tube then becomes the inner chamber of foundry goods, such as Chinese invention patent CN102806311 A applications are public
A kind of titanium investment foundry goods complexity pipeline forming technique that opens.Which has the disadvantage：Although first the method for intracavity diameter≤
The foundry goods of 10mm can be once-forming, but the fusion poor effect between metal tube and foundry goods, deposits between metal tube and foundry goods body
In the bonding gap of≤0.05mm, the performance for directly affecting foundry goods and the reliability for using.Secondth, it is difficult to molding to have in abnormity
The foundry goods in chamber.
Content of the invention
The purpose of the present invention is：A kind of improved titanium or titanium alloy casting casting method with irregularly-shaped inner hole is provided, with
The depoling hardly possible that occurs when just avoiding using ceramic core method, high cost, the low problem of efficiency；Simultaneously, it is ensured that the performance of foundry goods and
The reliability for using.
The technical scheme is that：The casting method of titanium or titanium alloy casting with irregularly-shaped inner hole, the casting for being cast
The inside of part 1 carries foundry goods irregularly-shaped inner hole 1a；Characterized in that, carrying out the casting of titanium or titanium alloy casting using investment casting method
Make, as follows the step of casting：
1st, mosaics is prepared：
1.1st, according to the threedimensional model of the three-dimension modeling mosaics 3 of foundry goods, made using machining process and inlayed
Chaeta base, mosaics blank carry mosaics irregularly-shaped inner hole 2, and the shape and size of mosaics irregularly-shaped inner hole 2 are interior with foundry goods abnormity
The shape and size of hole 1a are identical；Mosaics blank is inlayed by through hole with through hole positioning end and solid positioning end, through hole positioning end
Embedding part 3a and through hole position portion 3b composition, through hole are inlayed part 3a and are wrapped in inside foundry goods 1, are to constitute mosaics abnormity
A part for endoporus 2, through hole position portion 3b stretch out the outside on 1 surface of foundry goods, and the length of through hole position portion 3b is in foundry goods 1
Extend t=5mm～20mm on the basis of surface to outside surface, solid positioning end inlays part 3c and solid position portion by solid
3d is constituted, and the solid part 3c that inlays is wrapped in inside foundry goods 1, and solid position portion 3d stretches out the outside on 1 surface of foundry goods, solid
The length of position portion 3d is to extend t on the basis of 1 surface of foundry goods to outside surface；The wall thickness of mosaics blank be 1mm～
5mm；The material of mosaics 3 be titanium or with titanium alloy casting identical material；
1.2nd, wall thickness reduction is carried out to mosaics blank：The step of wall thickness reduction is：
1.2.1, computer simulation cast：Casting process simulation is carried out by the method for Computer Numerical Simulation first, is obtained
Go out the fusion effect of mosaics blank and foundry goods 1；
1.2.2, wall thickness reduction：Fusion rate of the above-mentioned mosaics blank with foundry goods 1 is checked, fusion rate is found out and is not conformed to
The region of lattice, the wall thickness of the mosaics blank in the unqualified region of fusion rate is carried out thinning, thinning amplitude for 0.05mm～
0.1mm；Fusion rate is unqualified to refer to that incomplete fusion or fusion rate are less than 50%；
1.2.3, repeat step 1.2.1～1.2.2, till fusion rate meets requirement；
1.2.4, according to fusion rate meet require when determined by mosaics blank wall thickness, mosaics blank is being led to
After hole position portion 3b and solid position portion 3d are protected, wall thickness reduction, wall thickness are carried out by milling to mosaics blank
Become mosaics 3 after thinning；
2nd, wax pattern is suppressed：According to foundry goods drawing and mosaics drawing making wax molds, using through hole position portion 3b and
Solid position portion 3d is fixed on mosaics 3 in wax molds, suppresses the wax pattern 4 containing mosaics 3, on mosaics 3
Through hole inlays part 3a and the solid part 3c that inlays is coated by wax, and through hole position portion 3b and solid position portion 3d be not by wax bag
Cover；
3rd, shell processed：Shell is manufactured according to normal shell manufacturing process, after dewaxing, mosaics 3 passes through through hole position portion
3b and solid position portion 3d are fixed in investment shell intracavity；Shell firing temperature is 700～950 DEG C；
4th, pour into a mould：Poured into a mould according to normal pouring technology；
5th, cut：The running gate system remained on foundry goods, through hole position portion 3b and solid position portion 3d are cut off and is obtained
Titanium or titanium alloy casting.
It is an advantage of the invention that：A kind of improved titanium or titanium alloy casting casting method with irregularly-shaped inner hole is provided,
The depoling hardly possible that occurs when being avoided that using ceramic core method, high cost, the low problem of efficiency；Simultaneously, it is ensured that the performance of foundry goods
With the reliability for using.
Description of the drawings
Fig. 1 is the partial sectional view of a kind of titanium with irregularly-shaped inner hole or titanium alloy casting.
Fig. 2 is the partial structural diagram of medium casting wax pattern of the present invention.
Fig. 3 is the partial sectional view of the titanium or titanium alloy casting using the inventive method molding.
In figure：1st, foundry goods, 1a, foundry goods irregularly-shaped inner hole, 2, mosaics irregularly-shaped inner hole, 3, mosaics, 3a, through hole inlay
Point, 3b, through hole position portion, 3c, solid inlay part, 3d, solid position portion, 4, wax pattern.
Specific embodiment
Below the present invention is described in further details.Referring to Fig. 1 to Fig. 3, the titanium or titanium alloy casting with irregularly-shaped inner hole
The casting method of part, the inside of the foundry goods 1 for being cast carry foundry goods irregularly-shaped inner hole 1a；Characterized in that, adopting model casting side
It is as follows that method carries out the step of casting of titanium or titanium alloy casting, casting：
1st, mosaics is prepared：
1.1st, according to the threedimensional model of the three-dimension modeling mosaics 3 of foundry goods, made using machining process and inlayed
Chaeta base, mosaics blank carry mosaics irregularly-shaped inner hole 2, and the shape and size of mosaics irregularly-shaped inner hole 2 are interior with foundry goods abnormity
The shape and size of hole 1a are identical；Mosaics blank is inlayed by through hole with through hole positioning end and solid positioning end, through hole positioning end
Embedding part 3a and through hole position portion 3b composition, through hole are inlayed part 3a and are wrapped in inside foundry goods 1, are to constitute mosaics abnormity
A part for endoporus 2, through hole position portion 3b stretch out the outside on 1 surface of foundry goods, and the length of through hole position portion 3b is in foundry goods 1
Extend t=5mm～20mm on the basis of surface to outside surface, solid positioning end inlays part 3c and solid position portion by solid
3d is constituted, and the solid part 3c that inlays is wrapped in inside foundry goods 1, and solid position portion 3d stretches out the outside on 1 surface of foundry goods, solid
The length of position portion 3d is to extend t on the basis of 1 surface of foundry goods to outside surface；The wall thickness of mosaics blank be 1mm～
5mm；The material of mosaics 3 be titanium or with titanium alloy casting identical material；
1.2nd, wall thickness reduction is carried out to mosaics blank：The step of wall thickness reduction is：
1.2.1, computer simulation cast：Casting process simulation is carried out by the method for Computer Numerical Simulation first, is obtained
Go out the fusion effect of mosaics blank and foundry goods 1；
1.2.2, wall thickness reduction：Fusion rate of the above-mentioned mosaics blank with foundry goods 1 is checked, fusion rate is found out and is not conformed to
The region of lattice, the wall thickness of the mosaics blank in the unqualified region of fusion rate is carried out thinning, thinning amplitude for 0.05mm～
0.1mm；Fusion rate is unqualified to refer to that incomplete fusion or fusion rate are less than 50%；
1.2.3, repeat step 1.2.1～1.2.2, till fusion rate meets requirement；
1.2.4, according to fusion rate meet require when determined by mosaics blank wall thickness, mosaics blank is being led to
After hole position portion 3b and solid position portion 3d are protected, wall thickness reduction, wall thickness are carried out by milling to mosaics blank
Become mosaics 3 after thinning；
2nd, wax pattern is suppressed：According to foundry goods drawing and mosaics drawing making wax molds, using through hole position portion 3b and
Solid position portion 3d is fixed on mosaics 3 in wax molds, suppresses the wax pattern 4 containing mosaics 3, on mosaics 3
Through hole inlays part 3a and the solid part 3c that inlays is coated by wax, and through hole position portion 3b and solid position portion 3d be not by wax bag
Cover；
3rd, shell processed：Shell is manufactured according to normal shell manufacturing process, after dewaxing, mosaics 3 passes through through hole position portion
3b and solid position portion 3d are fixed in investment shell intracavity；Shell firing temperature is 700～950 DEG C；
4th, pour into a mould：Poured into a mould according to normal pouring technology, wherein centrifugal rotational speed is 150～400 revs/min.
5th, cut：The running gate system remained on foundry goods, through hole position portion 3b and solid position portion 3d are cut off and is obtained
Titanium or titanium alloy casting.
The present invention operation principle be：According to the shape pre-production mosaics of foundry goods irregularly-shaped inner hole, using casting pouring
When molten metal once-forming foundry goods irregularly-shaped inner hole in foundry goods is coated on to mosaics.Meanwhile, by Computer Numerical Simulation
Method determines the wall thickness reduction scheme of mosaics blank, treats the zones of different on mosaics blank with a certain discrimination, to mosaics and casting
The qualified region of part fusion rate carries out localised protection, and to the underproof region of fusion rate by thinning mosaics wall thickness, increasing should
Position casting section thickness and mosaics wall ratio, the fusion of the position molten metal to mosaics, Jin Erti when increasing cast with this
High mosaics and the fusion rate of foundry goods body, make foundry goods that there is higher use reliability, are particularly well-suited to thin-section casting shaping.
Embodiment 1
A kind of preparation method of the Ti6Al4V titanium alloy castings for having elongated not isometrical inner through hole, concrete preparation process is such as
Under：
1st, mosaics is prepared：
1.1st, according to the threedimensional model of the three-dimension modeling mosaics of foundry goods, for elongated not isometrical inner through hole can be with
Mosaics blank is made using the method for pressure expansion, mosaics blank carries mosaics irregularly-shaped inner hole, mosaics irregularly-shaped inner hole
Shape and size identical with the shape and size of foundry goods irregularly-shaped inner hole；As mosaics irregularly-shaped inner hole is for through, respectively to
Extend the inner hole structure of both sides outside cast(ing) surface as left through hole position portion and right through hole position portion, left through hole position portion
Length be to extend 10mm on the basis of foundry goods left surface to the left, the length of right through hole position portion is surface right in foundry goods
On the basis of extend to the right 10mm, due to two side through hole position portions, can to meet mosaics positioning firm, without the need for extra in mosaics
Increase solid positioning end on blank.The thickness of mosaics blank is 3mm；The material of mosaics is the pure titaniums of TA2；
The mosaics blank that makes is made annealing treatment, to eliminate residual stress, prevents mosaics blank from deforming.According to
The material of mosaics, annealing temperature are 850 DEG C, and after being incubated 2 hours, furnace cooling is to room temperature；
1.2nd, wall thickness reduction is carried out to mosaics blank：The step of wall thickness reduction is：
1.2.1, computer simulation cast：Casting process simulation is carried out by the method for Computer Numerical Simulation first, is obtained
Go out the fusion effect of mosaics blank and foundry goods；
1.2.2, wall thickness reduction：Fusion rate of the above-mentioned mosaics blank with foundry goods is checked, fusion rate is found out and is not conformed to
The region of lattice, carries out thinning to the wall thickness of the mosaics blank in the unqualified region of fusion rate, and fusion rate is unqualified to refer to cast
The interface incomplete fusion or fusion rate that metal and mosaics are formed is less than 50%；
Simulation and forecast result shows that therefore foundry goods fusion rate carries out overall wall thickness reduction to mosaics blank less than 50%；
Thinning amplitude is 0.05mm；
1.2.3, repeat step 1.2.1～1.2.2, till fusion rate meets requirement；
1.2.4, according to the fusion rate met when requiring, determine mosaics blank wall thickness reduction 1.7mm, left through hole is fixed
Bit position and right through hole position portion are protected so as to can not be thinned wall thickness, and its port is blocked, then to edge
Inlay blank carries out outside wall thickness reduction by milling, becomes mosaics after wall thickness reduction；
The process of milling selects HF and HNO according to the characteristics of pure titanium3Mixed solution as corrosive liquid, wherein HF and HNO3
Mass fraction be respectively 4% and 10%.After mosaics blank two ends are blocked, integrally it is immersed in etchant solution, only to edge
Inlay blank outer wall carries out wall thickness reduction, controls wall thickness reduction speed by control corrosion rate liquid concentration and etching time, for this
Method, etching time are 211min；
Mosaics blank after to milling is cleaned process, is soaked using ethanol or alcohol organic solvent, and with ultrasonic
Cleaning, obtains mosaics.
2nd, wax pattern is suppressed：According to foundry goods drawing and mosaics drawing making wax molds, the left through hole positioning to mosaics
Section ports and right through hole position portion port are blocked, and will be inlayed using left through hole position portion and right through hole position portion
Body is fixed in wax molds, suppresses the wax pattern containing mosaics, left through hole position portion and right through hole position portion not by
Wax is coated；
3rd, shell processed：Shell is manufactured according to normal shell manufacturing process, after shell dewaxing, mosaics is positioned by left through hole
Part and right through hole position portion are fixed in investment shell intracavity；Shell firing temperature is 700 DEG C；
4th, pour into a mould：Poured into a mould according to normal pouring technology；Titanium alloy casting cast is carried out under vacuum conditions, vacuum
Degree is less than 6Pa, and using centrifugal casting mode, wherein centrifugal rotational speed is 150 revs/min.
5th, cut：The running gate system remained on foundry goods, left through hole position portion and right through hole position portion are cut off and is obtained
Ti6Al4V titanium alloy castings containing irregularly-shaped inner hole.
According to this technique, respectively with reduction processing after mosaics and the mosaics of original state prepare the titanium containing irregularly-shaped inner hole
Alloy-steel casting, the fusion rate of foundry goods and mechanical property contrast are shown in Table 1.It can be seen that, by simulating casting pouring process, prediction foundry goods melts
The unqualified region of conjunction rate, it is thinning that mosaics respective regions are carried out with wall thickness selectivity, can effectively reduce foundry goods lack of fusion area
Domain, improves foundry goods integrally fusion rate, and then improves the overall performance of foundry goods and use reliability.
Ti6Al4V foundry goods fusion rate of the table 1 containing irregularly-shaped inner hole and tensile property contrast
Embodiment 2
A kind of preparation method of the Ti6Al4V titanium alloy castings for having Pear-Shaped inner chamber, concrete preparation process are as follows：
1st, mosaics is prepared：
1.1st, according to the threedimensional model of the three-dimension modeling mosaics of foundry goods, due to the calabash that core cavity is unilateral insertion
Inner chamber is divided into two parts by reed shape curved surface cavity, the long axis direction along Pear-Shaped inner chamber, makes edge respectively using the method for punching press
Then two parts are welded together by the abnormal curved surface of inlay blank, make mosaics blank inner chamber interior with Ti6Al4V foundry goods abnormity
The shape and size in chamber are identical.The thickness of mosaics blank is 5mm；The material of mosaics is identical with foundry goods；Extend and inlay chaeta
Used as through hole position portion, length is that exterior surface extends 20mm on the basis of the position cast(ing) surface, is guarantor for base insertion side
Card mosaics positioning is firm, and a solid positioning end is welded on mosaics blank opposite side, do not affect casting mold to prepare position,
Solid positioning end inlays part and solid position portion is constituted, the solid length for inlaying part and the position casting section thickness by solid
Identical, the length of solid position portion is that exterior surface extends 20mm, solid positioning end on the basis of the position cast(ing) surface
With the same material of mosaics blank；
The mosaics blank that makes is made annealing treatment, to eliminate residual stress, prevents mosaics blank from deforming.According to
The material of mosaics, annealing temperature be 700 DEG C, temperature retention time after 4 hours furnace cooling to room temperature；
1.2nd, wall thickness reduction is carried out to mosaics blank：The step of wall thickness reduction is：
1.2.1, computer simulation cast：Casting process simulation is carried out by the method for Computer Numerical Simulation first, is obtained
Go out the fusion effect of mosaics blank and foundry goods；
1.2.2, wall thickness reduction：Fusion rate of the above-mentioned mosaics blank with foundry goods is checked, fusion rate is found out and is not conformed to
The region of lattice, carries out thinning to the wall thickness of the mosaics blank in the unqualified region of fusion rate, and fusion rate is unqualified to refer to cast
The interface incomplete fusion or fusion rate that metal and mosaics are formed is less than 50%；Chaeta is inlayed to the underproof region of fusion rate
Base carries out wall thickness reduction；Thinning amplitude is 0.1mm；
1.2.3, repeat step 1.2.1～1.2.2, till fusion rate meets requirement；
1.2.4, according to the fusion rate met when requiring, the unqualified region of fusion rate occurs in mosaics blank two ends and calabash
Two curved surface junction of reed shape, therefore only carries out wall thickness reduction to mosaics blank two ends and curved surface junction.For two ends and song
The different fusion situation in face junction, sets wall thickness and distinguishes thinning 2.1mm and 2.6mm.Mosaics blank through hole port is carried out
Closure, and after protecting to through hole position portion and solid position portion, carries out wall thickness reduction by milling, wall thickness reduction with
After become mosaics；
The process of milling selects HF and HNO according to the characteristics of titanium alloy3Mixed solution as corrosive liquid, wherein HF and
HNO3Mass fraction be respectively 8% and 15%.After mosaics blank insertion port is blocked, etchant solution is integrally immersed in
In, wall thickness reduction is carried out to mosaics blank outer wall only, wall thickness reduction speed is controlled by control corrosion rate liquid concentration and etching time
Degree.
First the region brushing protective paint to not needing wall thickness reduction carries out localised protection, carries out office to the region for needing thinning
Portion is thinning.Mosaics blank wall thickness 5mm, due to two ends and curved surface junction need thinning thickness differ respectively 2.1mm and
2.6mm, carries out successively thinning and protection on the basis of available minimum wall thickness reduction thickness every time.To connect except two ends and curved surface first
The mosaics blank brush protective paint beyond place is connect, is then placed in corrosive liquid, carrying out corrosion thinning, by control corrosion rate liquid concentration
With etching time control corrosion rate speed, this thickness thinning be 2.1mm, etching time is 166min, will be thinning after mosaics
Blank is taken out, and with clean water, is then only needing the two ends brush protective paint of thinning 2.1mm, mosaics blank is immersed corrosive liquid
In, continue thinning curved surface join domain, this thickness thinning is 0.5mm, and etching time is 40min, will be thinning after mosaics
Removal protective paint in organic solvent is put into after blank cleaning.
Mosaics blank after to milling is cleaned process, is soaked using ethanol or alcohol organic solvent, removes protection
Paint, and with being cleaned by ultrasonic, obtain mosaics.
2nd, wax pattern is suppressed：According to foundry goods drawing and mosaics drawing making wax molds, the through hole location division to mosaics
Point port is blocked, and mosaics is fixed in wax molds using through hole position portion and solid position portion, is suppressed
Wax pattern containing mosaics, wherein through hole position portion and solid position portion are not coated by wax, and solid part of inlaying is by wax bag
Cover；
3rd, shell processed：Shell is manufactured according to normal shell manufacturing process, after shell dewaxing, mosaics passes through through hole location division
Divide and solid position portion is fixed in investment shell intracavity；Shell firing temperature is 950 DEG C；
4th, pour into a mould：Poured into a mould according to normal pouring technology；Titanium alloy casting cast is carried out under vacuum conditions, vacuum
Degree is less than 6Pa, using gravity-assist pouring mode.
5th, cut：The running gate system remained on foundry goods, through hole position portion and solid position portion are cut off and is contained
The titanium alloy casting of irregularly-shaped inner hole.
According to this technique, respectively with reduction processing after mosaics and original state mosaics prepare pure containing irregularly-shaped inner hole
Titanium casting, the fusion rate of foundry goods and mechanical property contrast are shown in Table 2.It can be seen that, wall thickness selectivity is carried out to mosaics respective regions and is subtracted
Thin, foundry goods lack of fusion region can be effectively reduced, foundry goods integrally fusion rate is improved, and then is improved the overall performance of foundry goods and make
Use reliability.
Ti6Al4V foundry goods fusion rate of the table 2 containing irregularly-shaped inner hole and tensile property contrast
Embodiment 3
A kind of preparation method of the ZTA15 titanium alloy castings for having U-shaped inner through hole, concrete preparation process are as follows：
1st, mosaics is prepared：
1.1st, according to the threedimensional model of the three-dimension modeling mosaics of foundry goods, for U-shaped inner through hole can adopt heat
The method of processing makes mosaics blank, and mosaics blank carries mosaics irregularly-shaped inner hole, the shape of mosaics irregularly-shaped inner hole and
Size is identical with the shape and size of foundry goods irregularly-shaped inner hole；As mosaics irregularly-shaped inner hole is through, to cast(ing) surface extension
Used as through hole position portion, length is that exterior surface extends 5mm on the basis of the position cast(ing) surface to long two inner hole structures,
Firm for ensureing mosaics positioning, a solid positioning is welded on mosaics blank opposite side, do not affect casting mold to prepare position
Part is inlayed and solid position portion is constituted, the solid length for inlaying part and the position foundry goods by solid in end, solid positioning end
Wall thickness is identical, and the length of solid position portion is that exterior surface extends 5mm, solid positioning on the basis of the position cast(ing) surface
End and the same material of mosaics blank, the thickness of mosaics blank is 2mm；The material of mosaics is the pure titaniums of TA1；
The mosaics blank that makes is made annealing treatment, to eliminate residual stress, prevents mosaics blank from deforming.According to
The material of mosaics, annealing temperature be 800 DEG C, temperature retention time after 3 hours furnace cooling to room temperature；
1.2nd, wall thickness reduction is carried out to mosaics blank：The step of wall thickness reduction is：
1.2.1, computer simulation cast：Casting process simulation is carried out by the method for Computer Numerical Simulation first, is obtained
Go out the fusion effect of mosaics blank and foundry goods；
1.2.2, wall thickness reduction：Fusion rate of the above-mentioned mosaics blank with foundry goods is checked, fusion rate is found out and is not conformed to
The region of lattice, carries out thinning to the wall thickness of the mosaics blank in the unqualified region of fusion rate, and fusion rate is unqualified to refer to cast
The interface incomplete fusion or fusion rate that metal and mosaics are formed is less than 50%；
Simulation and forecast result shows that therefore foundry goods fusion rate carries out overall wall thickness reduction to mosaics blank less than 50%；
Thinning amplitude is 0.05mm；
1.2.3, repeat step 1.2.1～1.2.2, till fusion rate meets requirement；
1.2.4, according to the fusion rate met when requiring, determine mosaics blank wall thickness reduction to 0.6mm, to mosaics
Blank through hole port is blocked, and after protecting to through hole position portion and solid position portion, is carried out milling wall thickness and subtracted
Thin, become mosaics after wall thickness reduction；
The process of milling selects HF and HNO according to the characteristics of pure titanium3Mixed solution as corrosive liquid, wherein HF and HNO3
Mass fraction be respectively 6% and 12%.After mosaics blank port is blocked, integrally it is immersed in etchant solution, only to edge
Inlay blank outer wall carries out wall thickness reduction, and thickness thinning is 1.4mm, controls wall thickness by control corrosion rate liquid concentration and etching time
Thinning speed, for this method, etching time is 146min；
Mosaics blank after to milling is cleaned process, is soaked using ethanol or alcohol organic solvent, and with ultrasonic
Cleaning, obtains mosaics.
2nd, wax pattern is suppressed：According to foundry goods drawing and mosaics drawing making wax molds, the through hole location division to mosaics
Point port is blocked, and mosaics is fixed in wax molds using through hole position portion and solid position portion, is suppressed
Wax pattern containing mosaics, through hole position portion and solid position portion are not coated by wax；
3rd, shell processed：Shell is manufactured according to normal shell manufacturing process, after shell dewaxing, mosaics is by left position portion
It is fixed in investment shell intracavity with right position portion；Shell firing temperature is 850 DEG C；
4th, pour into a mould：Poured into a mould according to normal pouring technology；Titanium alloy casting cast is carried out under vacuum conditions, vacuum
Degree is less than 6Pa, and using centrifugal casting mode, wherein centrifugal rotational speed is 300 revs/min.
5th, cut：The running gate system remained on foundry goods, through hole position portion and solid position portion are cut off and is contained
The ZTA15 titanium alloy castings of irregularly-shaped inner hole.
According to this technique, respectively with reduction processing after mosaics and the mosaics of original state prepare the titanium containing irregularly-shaped inner hole
Alloy-steel casting, the fusion rate of foundry goods and mechanical property contrast are shown in Table 3.It can be seen that, wall thickness selectivity is carried out to mosaics respective regions
Thinning, can effectively reduce foundry goods lack of fusion region, improve foundry goods integrally fusion rate, and then improve foundry goods overall performance and
Using reliability.
ZTA15 foundry goods fusion rate of the table 3 containing irregularly-shaped inner hole and tensile property contrast
Claims (1)
1. the casting method of the titanium or titanium alloy casting of irregularly-shaped inner hole is carried, and the inside of the foundry goods for being cast (1) is different with foundry goods
Shape endoporus (1a)；Characterized in that, carrying out the step of casting of titanium or titanium alloy casting, casting using investment casting method such as
Under：
1.1st, mosaics is prepared：
1.1.1, according to the threedimensional model of the three-dimension modeling mosaics (3) of foundry goods, made using machining process and inlayed
Chaeta base, mosaics blank carry mosaics irregularly-shaped inner hole (2), and the shape and size of mosaics irregularly-shaped inner hole (2) are different with foundry goods
The shape and size of shape endoporus (1a) are identical；Mosaics blank with through hole positioning end and solid positioning end, through hole positioning end by
Through hole inlays part (3a) and through hole position portion (3b) composition, and through hole is inlayed part (3a) and is wrapped in foundry goods (1) inside, is
A part for mosaics irregularly-shaped inner hole (2) is constituted, through hole position portion (3b) stretches out the outside on foundry goods (1) surface, and through hole is positioned
Partly the length of (3b) is on the basis of foundry goods (1) surface to extend t=5mm～20mm to outside surface, and solid positioning end is by reality
The heart inlays part (3c) and solid position portion (3d) composition, and solid part (3c) of inlaying is wrapped in foundry goods (1) inside, solid
Position portion (3d) stretches out the outside on foundry goods (1) surface, and the length of solid position portion (3d) is the basis on foundry goods (1) surface
On to outside surface extend t；The wall thickness of mosaics blank is 1mm～5mm；The material of mosaics (3) is titanium or and titanium alloy casting
Identical material；
1.1.2 wall thickness reduction is carried out to mosaics blank,：The step of wall thickness reduction is：
1.1.2.1, computer simulation cast：Casting process simulation is carried out by the method for Computer Numerical Simulation first, is drawn
Mosaics blank and the fusion effect of foundry goods (1)；
1.1.2.2, wall thickness reduction：Fusion rate of the above-mentioned mosaics blank with foundry goods (1) is checked, fusion rate is found out and is not conformed to
The region of lattice, the wall thickness of the mosaics blank in the unqualified region of fusion rate is carried out thinning, thinning amplitude for 0.05mm～
0.1mm；Fusion rate is unqualified to refer to that incomplete fusion or fusion rate are less than 50%；
1.1.2.3, repeat step 1.1.2.1～1.1.2.2, till fusion rate meets requirement；
1.1.2.4, according to fusion rate meet require when determined by mosaics blank wall thickness, in the through hole to mosaics blank
After the qualified region of position portion (3b) and solid position portion (3d) and fusion rate is protected, mosaics blank is passed through
Milling carries out wall thickness reduction, becomes mosaics (3) after wall thickness reduction；
1.2nd, wax pattern is suppressed：According to foundry goods drawing and mosaics drawing making wax molds, using through hole position portion (3b) and
Solid position portion (3d) is fixed on mosaics (3) in wax molds, suppresses the wax pattern containing mosaics (3) (4), inlays
Through hole on body (3) inlays part (3a) and solid inlay partly (3c) is coated by wax, through hole position portion (3b) and solid fixed
Bit position (3d) is not coated by wax；
1.3rd, shell processed：Shell is manufactured according to normal shell manufacturing process, after dewaxing, mosaics (3) passes through through hole position portion
(3b) it is fixed in investment shell intracavity with solid position portion (3d)；Shell firing temperature is 700～950 DEG C；
1.4th, pour into a mould：Poured into a mould according to normal pouring technology；
1.5th, cut：The running gate system remained on foundry goods, through hole position portion (3b) and solid position portion (3d) are cut off and is obtained
Obtain titanium or titanium alloy casting.
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| CN110479961B (en) * | 2019-09-24 | 2020-11-06 | 龙南新晶钛业有限公司 | Titanium alloy combined casting process |
| CN111451446B (en) * | 2020-05-13 | 2021-09-14 | 中国航发北京航空材料研究院 | Method for manufacturing TiAl series intermetallic compound precision casting shell observation hole |
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