CN117718437A - Casting forming method of large thin-wall titanium casting - Google Patents
Casting forming method of large thin-wall titanium casting Download PDFInfo
- Publication number
- CN117718437A CN117718437A CN202311671929.2A CN202311671929A CN117718437A CN 117718437 A CN117718437 A CN 117718437A CN 202311671929 A CN202311671929 A CN 202311671929A CN 117718437 A CN117718437 A CN 117718437A
- Authority
- CN
- China
- Prior art keywords
- casting
- pickling
- amount
- large thin
- qualified
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005266 casting Methods 0.000 title claims abstract description 215
- 238000000034 method Methods 0.000 title claims abstract description 63
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 239000010936 titanium Substances 0.000 title claims abstract description 28
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 28
- 238000005554 pickling Methods 0.000 claims abstract description 88
- 230000007547 defect Effects 0.000 claims abstract description 35
- 230000008569 process Effects 0.000 claims abstract description 29
- 238000005495 investment casting Methods 0.000 claims abstract description 21
- 238000013461 design Methods 0.000 claims abstract description 20
- 229910001069 Ti alloy Inorganic materials 0.000 claims abstract description 18
- 238000000465 moulding Methods 0.000 claims abstract description 16
- 239000002253 acid Substances 0.000 claims abstract description 13
- 238000005498 polishing Methods 0.000 claims abstract description 12
- 238000005406 washing Methods 0.000 claims abstract description 12
- 238000000137 annealing Methods 0.000 claims abstract description 6
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 16
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 8
- 229910017604 nitric acid Inorganic materials 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 6
- 239000002519 antifouling agent Substances 0.000 claims description 5
- 238000001513 hot isostatic pressing Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000010422 painting Methods 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 230000008602 contraction Effects 0.000 abstract description 4
- 230000008439 repair process Effects 0.000 description 9
- 238000003466 welding Methods 0.000 description 9
- 238000012937 correction Methods 0.000 description 6
- 238000011282 treatment Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000462 isostatic pressing Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
Abstract
The invention provides a casting molding method of a large thin-wall titanium casting, which comprises the following steps: s1: placing pickling amount when the casting is subjected to process design; s2: modeling according to the casting process design; s3: preparing a casting blank; s4: primary acid washing; s5: removing the quality defect of the titanium alloy investment casting prepared in the step S4; s6: scanning and secondary acid washing; s7: repeating the step S6 until all the sizes of the castings are qualified; s8: polishing the broken difference; s9: and carrying out vacuum annealing on the qualified castings. According to the casting molding method of the large thin-wall titanium casting, the pickling amount is placed during process setting, so that the size of the contracted and deformed casting is still in a qualified range, a plurality of parts are removed through pickling, the pickling rate is controllable, the thinning amount of the casting can be accurately controlled, and the defect of the size of the large thin-wall casting caused by improper placement of the contraction amount and deformation in the production process of the casting is effectively avoided, so that the casting meeting the requirements is obtained.
Description
Technical Field
The invention relates to the technical field of precision investment casting, in particular to a casting forming method of a large thin-wall titanium casting.
Background
At present, aerospace titanium castings gradually develop towards large thin walls, and corresponding casting forming technology has become a bottleneck for restricting the casting development of titanium alloy.
Investment casting is widely applied because the investment casting can cast castings with the wall thickness below 0.5mm, the investment casting is formed by covering a model with high-temperature refractory materials, removing the model to form a cavity after reaching a certain thickness, then pouring molten metal into the cavity for solidification molding, and conforming the surface, the interior and the size of the castings to the requirements through post-treatment, thus obtaining qualified castings. In the production process of the casting, the thin-wall casting is easy to deform due to poor structural rigidity, so that the dimension is poor. The deformation process mainly comprises the following steps: 1. the model is deformed under the action of gravity in the shell making process, 2, the casting is deformed due to uneven shrinkage of molten metal in the cooling process, 3, the repair welding in the post-treatment of the casting can cause the local overheating and rapid cooling defect of the casting to generate deformation.
In addition, due to the effect of thermal expansion and contraction, the metal liquid can shrink in volume when solidified into solid, and when the casting process is designed, the shrinkage can be placed according to the structure and the size of the casting, so that the casting can reach qualified size after shrinkage, but due to the fact that the degree of correlation between the metal liquid shrinkage and the process and the environment is high, the shrinkage rate placed by the process staff through experience is likely to be unsuitable, so that the casting size is out of tolerance, and the cost is increased. After the size is bad, the casting is qualified by adopting the methods of correction, repair welding and polishing, and the correction can cause the change of the molded surface of other qualified parts; repair welding can lead the casting to generate defects such as cracks, air holes and the like; the polishing amount cannot be accurately controlled during polishing, the molded surface is usually changed by the method, the casting size cannot be accurately corrected, and the casting is scrapped due to serious cases.
Disclosure of Invention
In view of the above, the invention aims to provide a casting molding method of a large thin-wall titanium casting, which is characterized in that the pickling amount is placed in the process setting, so that the dimensions of the casting after shrinkage and deformation are still in a qualified range, and the dimensional defect of the large thin-wall casting caused by improper placement of the shrinkage amount and deformation in the production process of the casting can be effectively avoided, thereby obtaining the casting meeting the requirements.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a casting molding method of a large thin-wall titanium casting comprises the following steps:
s1: when the casting is subjected to process design, the pickling amount is placed according to the casting structure except for shrinkage, processing amount and process patch;
s2: modeling according to the casting process design;
s3: performing tree formation, shell making, dewaxing, roasting, casting, hot isostatic pressing and sand blasting on the model to obtain a titanium alloy investment casting blank;
s4: acid washing for the first time to remove a pollution layer on the surface of the casting;
s5: removing the quality defect of the titanium alloy investment casting prepared in the step S4;
s6: scanning, secondary pickling, namely protecting a casting body in a qualified range through scanning comparison, and pickling the rest part;
s7: repeating the step S6 until all the sizes of the castings are qualified;
s8: polishing the broken difference;
s9: and carrying out vacuum annealing on the qualified castings.
Furthermore, the pickling quantity is symmetrically arranged on both sides when the casting is designed, and the value range of the single-side pickling quantity H is 0.5-1.5 mm.
Further, in the step S4, scanning is performed before one-time pickling, the deviation amount of the actual casting and the theoretical casting is obtained by comparing the three-dimensional scanning data cloud with the theoretical three-dimensional model of the casting, and when the deviation amount is compared, part of the casting within the tolerance range is set as qualified, and the rest part is the pickling removal amount.
Further, in the step S4, the removal amount of the primary pickling is 30% -60% of the removal amount of the casting which can be pickled.
Further, in step S4, the pickling solution for primary pickling is prepared from water, hydrofluoric acid and nitric acid, and the ratio of the components by volume is: hydrofluoric acid: nitric acid = 30% -60%: 30% -60%: 5% -30%.
Further, the pickling solution is subjected to pickling rate test through a test block after being proportioned, and the pickling time for removal is determined according to the pickling removal amount in the step S4.
Further, in step S5, removing the quality defects of the titanium alloy investment casting produced in step S4 includes removing internal defects and removing surface defects.
Further, in step S6, the casting body protection in the joining range is protected by taping and painting a protective paint.
Further, in step S6, the pickling removal amount of the casting body outside the qualified range does not exceed the tolerance of the casting at each single side pickling removal amount.
Compared with the prior art, the casting molding method of the large thin-wall titanium casting has the following advantages:
(1) According to the casting molding method of the large thin-wall titanium casting, the placement pickling quantity H is increased, so that special requirements on the structure and the size of the casting are considered in advance in the early design stage, the size and the profile of the casting can be accurately adjusted, the size of the casting can be corrected under the condition of ensuring the profile requirement through repeated pickling, the scrapping and the cost increase of the casting caused by multiple procedures such as correction, polishing and repair welding required by the traditional method are avoided, the production efficiency is improved, the defect of the size of the large thin-wall casting caused by improper placement of the shrinkage of the casting and deformation in the production process is effectively avoided, and the prepared profile and the wall thickness of the large thin-wall titanium casting are ensured to meet the design requirement.
(2) According to the casting molding method of the large thin-wall titanium casting, the pickling amount is placed during process setting, so that the size of the contracted and deformed casting is still in a qualified range, the excessive part is removed through pickling, the pickling rate is controllable, the thinning amount of the casting can be accurately controlled, and the defect of the size of the large thin-wall casting caused by improper placement of the contraction amount and deformation in the production process of the casting can be effectively avoided, so that the casting meeting the requirements is obtained.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic illustration of an undeformed and properly contracted cast and acid-washable part according to an embodiment of the present invention;
FIG. 2 is a schematic view of the structure of the casting and the acid-washable part when the shrinkage placement is not proper;
FIG. 3 is a schematic view of a deformed casting and the amount of acid that can be washed;
reference numerals illustrate:
and the qualified casting range 1 and the pickling part 2 can be performed.
Detailed Description
In order to facilitate understanding of the technical means, objects and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
It is to be noted that all terms used for directional and positional indication in the present invention, such as: "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "top", "low", "lateral", "longitudinal", "center", etc. are merely used to explain the relative positional relationship, connection, etc. between the components in a particular state (as shown in the drawings), and are merely for convenience of description of the present invention, and do not require that the present invention must be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The invention discloses a casting molding method of a large thin-wall titanium casting, which comprises the following steps:
s1: when the casting is subjected to process design, the pickling amount is placed according to the casting structure except for shrinkage, processing amount and process patch;
s2: modeling according to the casting process design;
s3: performing tree formation, shell making, dewaxing, roasting, casting, hot isostatic pressing and sand blasting on the model to obtain a titanium alloy investment casting blank;
s4: acid washing for the first time to remove a pollution layer on the surface of the casting;
s5: removing the quality defect of the titanium alloy investment casting prepared in the step S4;
s6: scanning, secondary pickling, namely protecting a casting body in a qualified range through scanning comparison, and pickling the rest part;
s7: repeating the step S6 until all the sizes of the castings are qualified;
s8: polishing the broken difference;
s9: and carrying out vacuum annealing on the qualified castings.
According to the casting molding method of the large thin-wall titanium casting, when the process design is carried out, except the shrinkage, the processing amount and the process patch which are designed during normal casting, the size of the casting is increased, the pickling amount is placed according to the casting structure, then the titanium alloy investment casting is completed according to the casting process, after the titanium alloy investment casting is completed, the surface pollution layer of the titanium alloy investment casting is removed through primary pickling, then the quality defect of the titanium alloy investment casting prepared in the step S4 is removed through the processes of isostatic pressing treatment, heat treatment, machining and trimming, ultrasonic cleaning, magnetron sputtering coating and the like, the titanium alloy investment casting with the quality defect removed is scanned and subjected to secondary pickling, the casting body in a qualified range is protected through scanning comparison, the pickling speed of the rest part is controllable, the pickling amount in the step S6 does not exceed casting tolerance, the step S7 is repeated until the whole size is qualified, the qualified pickling is gradually polished, the possible problem of broken difference is solved, and finally the vacuum annealing is carried out, so that the performance and the stability of the titanium alloy investment casting are improved. According to the casting molding method of the large thin-wall titanium casting, the pickling amount is increased to increase the gradual size at the beginning of design, then the requirement on the profile of the thin-wall casting is guaranteed through a mode of repeated pickling, the profile and the wall thickness of the thin-wall casting can be more accurately trimmed, the casting with qualified size is obtained, the casting scrapping caused by the traditional method is avoided, the cost is reduced, meanwhile, the problem that the casting size is poor, and the problem that the efficiency is low due to turnover among multiple processes such as correction, polishing and repair welding is solved through the repeated pickling steps is solved.
According to the casting molding method of the large thin-wall titanium casting, the placement acid washing amount H is increased, special requirements on the structure and the size of the casting are considered in advance at the initial stage of design, the size and the profile of the casting can be accurately adjusted, the size of the casting can be corrected under the condition that the profile requirement is guaranteed through repeated acid washing, the scrapping and the cost increase of the casting caused by multiple procedures such as correction, polishing and repair welding required by the traditional method are avoided, the production efficiency is improved, the defect of the casting due to improper placement of the shrinkage and the poor size of the large thin-wall casting caused by deformation in the production process is effectively avoided, and the prepared profile and the wall thickness of the large thin-wall titanium casting are guaranteed to meet the design requirement.
As a preferred example of the method, the pickling quantity is symmetrically arranged on two sides during casting design, and the value range of the single-side pickling quantity H is 0.5-1.5 mm. As an example of the application, the value range of H is 0.5-1.5 mm, namely the unilateral pickling quantity of the casting, and the method is favorable for meeting the requirements of the parts on the size and the surface in a more accurate manner for a large thin-wall structure, particularly for a thin-wall part and a region with higher requirement on the molded surface, and is favorable for keeping the stability of the size and the precision of the shape of the casting in the casting and subsequent processing processes, so that the size and the molded surface quality of the key parts are ensured to meet the design requirement, and the size stability, the shape precision and the overall quality of the casting are improved.
In step S4, scanning is performed before one-time pickling, and the deviation amount of the actual casting and the theoretical casting is obtained by comparing the three-dimensional scanning data cloud with the theoretical three-dimensional model of the casting, and when comparing, part of the casting within the tolerance range is set as qualified, namely, the qualified casting range 1, and the rest part is the pickling removal amount, namely, the pickling part 2. As shown in fig. 1 to 3, three different comparison structures are provided, namely a casting qualification range 1 and a pickling part 2 which are not deformed and have proper shrinkage are shown in fig. 1, and fig. 2 is a schematic structure diagram of a casting and a pickling part when shrinkage placement is improper in pickling; fig. 3 is a schematic view of the structure of the acid-washable part 2 on the deformed casting. According to the device, through three-dimensional scanning and theoretical model comparison, the deviation condition of the sizes of all parts of the casting is accurately identified, the casting is divided into a qualified range and a part which needs to be removed through pickling, the size of the casting is accurately controlled, the casting is ensured to meet the design requirement, and the possibility of scrapping the casting in the manufacturing process is reduced.
As a preferred example of the present application, in step S4, the removal amount of the primary pickling is 30% to 60% of the removal amount of the castings that can be pickled. The method is favorable for accurately removing the surface pollution layer by setting the pickling removal amount in a certain proportion, and simultaneously, the original surface quality and form of the casting are reserved to the greatest extent, namely, the pollution layer is effectively removed, the risk of deformation or damage of the casting caused by excessive treatment is reduced, the surface quality of the casting is improved, and the quality defect of the titanium alloy investment casting to be removed later is reduced.
As a preferred example of the present application, in step S4, the pickling solution for primary pickling is prepared from water, hydrofluoric acid and nitric acid, and the ratio of the components by volume is: hydrofluoric acid: nitric acid = 30% -60%: 30% -60%: 5-30%, wherein the mass percentage concentration of nitric acid is 60-70%, and the mass percentage concentration of hydrofluoric acid is 40-50%. After the pickling solution is proportioned, the pickling rate can be tested through a test block so as to determine the pickling time for removing the pickling removal amount in the casting in one pickling process. The pickling can eliminate deformation and poor size caused by improper shell making, solidification and shrinkage rate placement, and avoid turnover among multiple processes such as correction, polishing, repair welding and the like.
Through accurate cooperation and test, can effectively get rid of pollution layer and bad surface in the foundry goods, help the effect of accurate control pickling and the quality in the handling process, help repairing the defect of foundry goods in the casting process, avoid traditional school type, polish, repair welding etc. the use of multiple processes, improve production efficiency and reduce manufacturing cost.
In step S5, removing the quality defects of the titanium alloy investment casting produced in step S4 includes removing internal defects and removing surface defects.
The internal defects and the surface defects of the casting subjected to primary pickling are eliminated, the internal defects comprise air holes, inclusions and the like, the internal quality of the casting can be improved by eliminating the internal defects, the mechanical performance and the reliability of the casting are improved, and the problems that the casting is not easy to crack or break in the use process are solved; the elimination of surface defects, including defects caused by oxidation, pollution, uneven solidification, and the like, can improve the surface quality and appearance of the casting by eliminating the surface defects, ensure that the surface defects reach the appearance and the finish required by design, and improve the overall quality of the casting.
As a preferred example of the present application, in step S6, the casting body protection in the involution range is protected by taping and painting a protective paint. The casting body in the joining range is protected by sticking adhesive tape or brushing protective paint, so that the part which has reached the specified quality standard is not influenced by subsequent processing treatment, the original state and quality of the qualified part of the casting are maintained, and meanwhile, the damage to the joining part caused by misoperation or accidents (such as scratches, pollution or other adverse effects) in the subsequent processing process can be prevented, the production efficiency is improved, and the stability of the casting quality is ensured.
As a preferred example of the present application, in step S6, the amount of acid-washable removal outside the acceptable range of the cast body does not exceed the tolerance of the cast per single-sided acid-washing removal. For example, if the casting size is 5.+ -. 0.3mm, the portion exceeding 5.3mm needs to be pickled, and the single side pickling amount cannot exceed 0.3mm. The acid washing can eliminate the deformation of the thin-wall casting caused by repair welding of the casting.
And in combination with repeated steps in the step S7, the pickling removal amount of the casting is removed in stages, the dimensional deviation of the casting is corrected gradually, the dimensional deviation or deformation risk caused by excessive one-time treatment is avoided, the quality and stability of the casting are better controlled, the possibility that the casting is rejected due to unqualified judgment caused by dimensional problems is reduced, and the rejection rate is reduced.
Practical examples of the present invention
For example, a large thin-wall titanium casting, the wall thickness of the main body is 2+/-0.37 mm, and the profile contour is required to be 0.6.
1. In the process design, the overall unilateral offset pickling amount H is 1mm after the over-processing amount, the shrinkage amount and the process patch are placed;
2. making a designed model, and obtaining a casting blank after tree assembly, shell making, roasting, casting and hot isostatic pressing;
3. and scanning the casting blank, and setting the tolerance to +/-0.37 mm when the casting blank is compared with a theoretical casting model, wherein the qualified part is green within the casting tolerance range, and the yellow part is the pickling capacity. Carrying out primary pickling according to actual conditions, and if the minimum value exceeding the minimum value of the qualified casting is 0.6MM, the single-side pickling amount can be 0.3MM;
the pickling solution comprises water in volume ratio: hydrofluoric acid: nitric acid=50%: 40%:10% of the mixture is proportioned. The pickling speed is measured to be 0.05mm/min, and the pickling time is 6min;
4. eliminating internal defects and surface defects of castings;
5. scanning, secondary acid washing, namely protecting the casting body in a qualified range through scanning comparison, and carrying out acid washing on the rest part, wherein the protection can be carried out by sticking adhesive tapes and brushing protective paint. The single side of the pickling quantity is not more than 0.37mm;
step 6, repeating the step 5 until all parts of the casting are qualified;
7. polishing the broken difference;
8. and carrying out vacuum annealing on the qualified castings to obtain the qualified castings.
According to the casting molding method of the large thin-wall titanium casting, the pickling amount is placed during process setting, so that the size of the contracted and deformed casting is still in a qualified range, a plurality of parts can be removed through pickling, the pickling rate is controllable, the thinning amount of the casting can be accurately controlled, and the defect of the size of the large thin-wall casting caused by improper placement of the contraction amount and deformation in the production process of the casting can be effectively avoided, so that the casting meeting the requirements is obtained.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. A casting molding method of a large thin-wall titanium casting is characterized by comprising the following steps:
s1: when the casting is subjected to process design, the pickling amount is placed according to the casting structure except for shrinkage, processing amount and process patch;
s2: modeling according to the casting process design;
s3: performing tree formation, shell making, dewaxing, roasting, casting, hot isostatic pressing and sand blasting on the model to obtain a titanium alloy investment casting blank;
s4: acid washing for the first time to remove a pollution layer on the surface of the casting;
s5: removing the quality defect of the titanium alloy investment casting prepared in the step S4;
s6: scanning, secondary pickling, namely protecting a casting body in a qualified range through scanning comparison, and pickling the rest part;
s7: repeating the step S6 until all the sizes of the castings are qualified;
s8: polishing the broken difference;
s9: and carrying out vacuum annealing on the qualified castings.
2. The casting molding method of the large thin-wall titanium casting according to claim 1, wherein the pickling amount is symmetrically arranged on two sides during casting design, and the value range of the single-side pickling amount H is 0.5-1.5 mm.
3. The casting molding method of the large thin-wall titanium casting according to claim 1 or 2, wherein in the step S4, scanning is performed before one pickling, and the deviation amount of the actual casting and the theoretical casting is obtained by comparing a three-dimensional scanning data cloud with a theoretical three-dimensional model of the casting, and when the deviation amount is compared, a part in the casting tolerance range is set as qualified, and the rest is the pickling removal amount.
4. A casting method for a large thin-walled titanium casting according to claim 3, wherein in step S4, the removal amount of one acid washing is 30% to 60% of the removal amount of the casting which can be acid washed.
5. The casting method of large thin-wall titanium castings according to claim 1, 2 or 4, wherein in the step S4, the pickling solution for primary pickling is prepared from water, hydrofluoric acid and nitric acid, and the ratio of the components by volume is: hydrofluoric acid: nitric acid = 30% -60%: 30% -60%: 5% -30%.
6. The casting method of the large thin-wall titanium casting according to claim 5, wherein the pickling solution is subjected to pickling rate test by a test block after being proportioned, and the pickling time for removal is determined according to the pickling removal amount in the step S4.
7. The casting method of large thin-walled titanium castings according to claim 1 or 6, wherein in the step S5, the removal of the quality defects of the titanium alloy investment casting produced in the step S4 includes the removal of internal defects and the removal of surface defects.
8. The casting method of large thin-wall titanium castings according to claim 1 or 6, wherein in step S6, the casting body within the proper range is protected by taping and painting a protective paint.
9. The casting method of large thin-wall titanium castings according to claim 8, wherein in the step S6, the pickling removal amount of the casting body outside the acceptable range is not more than the tolerance of the casting at one side at a time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311671929.2A CN117718437A (en) | 2023-12-07 | 2023-12-07 | Casting forming method of large thin-wall titanium casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311671929.2A CN117718437A (en) | 2023-12-07 | 2023-12-07 | Casting forming method of large thin-wall titanium casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117718437A true CN117718437A (en) | 2024-03-19 |
Family
ID=90199080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311671929.2A Pending CN117718437A (en) | 2023-12-07 | 2023-12-07 | Casting forming method of large thin-wall titanium casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117718437A (en) |
-
2023
- 2023-12-07 CN CN202311671929.2A patent/CN117718437A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9476307B2 (en) | Castings, casting cores, and methods | |
| US7296615B2 (en) | Method and apparatus for determining the location of core-generated features in an investment casting | |
| CN109724556B (en) | Method for evaluating recrystallization tendency in precision casting process of nickel-based single crystal superalloy | |
| CN103192027A (en) | Partial cooling method of cold iron in investment casting | |
| CN109112446A (en) | Large thin-wall high strength alumin ium alloy bipyramid diamond shape entirety cabin shell precision casting molding method | |
| CN106944592A (en) | Water-soluble wax and Water-soluble ceramic core combine the application in aluminium alloy model casting | |
| CN109434029B (en) | 3D printing sand mold and sand core baking method | |
| CN109332998A (en) | A kind of manufacturing method of super long type thin-wall aluminum alloy sandwich grid ribs bilayer covering entirety empennage | |
| CN108817315A (en) | A kind of forming method of split type water-soluble core combined shaping double shrouded wheel | |
| CN110722103A (en) | Precision casting process of high-rotation-speed mixing head | |
| CN105583364A (en) | Casting technology for forming small-size complex cavity of titanium alloy casting | |
| CN101456061B (en) | Auxiliary technique capable of increasing graphite mould titanium alloy casting quality | |
| CN105983658B (en) | A kind of Ti3The preparation method of Al alloys guide vane inner ring model for precision casting and formwork | |
| CN110695317B (en) | Precise casting process of gate plate casting convenient for wax removal and exhaust | |
| CN111097875B (en) | Casting process of inner chill for accelerated solidification and cooling of thick and large investment castings | |
| CN114210926B (en) | Turbine blade investment casting shell and casting process thereof | |
| US5339888A (en) | Method for obtaining near net shape castings by post injection forming of wax patterns | |
| CN105382241A (en) | Casting process of oil separator box body | |
| CN110842145A (en) | 3D printing wax pattern dust-free dewaxing method | |
| CN117718437A (en) | Casting forming method of large thin-wall titanium casting | |
| CN112642992B (en) | Process for improving deformation of circular thin-wall investment casting | |
| CN112916811B (en) | Casting method of hollow turbine blade with air film hole | |
| CN220805415U (en) | Pouring system with ceramic core castings | |
| CN117086261A (en) | Processing technology of metal hollow product | |
| CN111318642B (en) | Wax mold manufacturing method of aluminum alloy fired mold precision casting with embedded structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |