CN115740494A - TiAl alloy blade and manufacturing method thereof - Google Patents
TiAl alloy blade and manufacturing method thereof Download PDFInfo
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- CN115740494A CN115740494A CN202211360099.7A CN202211360099A CN115740494A CN 115740494 A CN115740494 A CN 115740494A CN 202211360099 A CN202211360099 A CN 202211360099A CN 115740494 A CN115740494 A CN 115740494A
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Abstract
The invention belongs to the technical field of metal additive manufacturing, and discloses a TiAl alloy blade and a manufacturing method thereof, wherein the manufacturing method comprises the steps of performing additive machining design and additive machining process simulation analysis on a blade model; carrying out inverse deformation compensation design on the blade model to obtain a compensation optimization model of the blade; processing the attitude optimization data, the support generation data and the slicing data of the printed piece according to the compensation optimization model and exporting the processed data; setting 3D printing process parameters according to the processed data; wrapping an electromagnetic field environment on the forming surface of the 3D printing piece; 3D printing processing of the TiAl alloy blade is carried out under the 3D printing technological parameters and the electromagnetic field environment, and a blank is obtained; and carrying out post-treatment on the blank to obtain a finished product TiAl alloy blade. According to the invention, the TiAl alloy blade part with the dimensional precision and the surface finish within the allowable range is rapidly prepared by adopting an additive design and an electron beam 3D printing method and matching with an electromagnetic field in-situ auxiliary treatment and post-treatment process.
Description
Technical Field
The invention belongs to the technical field of metal additive manufacturing, and particularly relates to a TiAl alloy blade and a manufacturing method thereof.
Background
The TiAl-based alloy is one of the most potential high-temperature structural materials due to the advantages of high melting point, high specific strength, good high-temperature creep property, good oxidation resistance and the like. Within the temperature range of 700-850 ℃, the specific strength of the TiAl alloy is obviously higher than that of common titanium alloy, nickel-based high-temperature alloy and other materials, and the TiAl alloy is mainly used for manufacturing parts such as air compressor blades, low-pressure turbine blades and the like of aeroengines. At present, the commercial aircraft engines of the Yangtze river series such as CJ1000A, CJ2000 and the like put an urgent need on TiAl alloy low-pressure turbine blades. Compared with the original nickel-based high-temperature alloy blade, the weight of the TiAl blade is reduced by 50 percent, the fuel consumption is reduced by 15 percent, and the performance of the engine is obviously improved. Currently, there are two main production modes for the TiAl alloy blade, namely a precision casting method and an additive manufacturing method. The GEnx engine of the GE company and the LEAP engine of the Famei capital CFM international company in the United states both adopt TiAl alloy blades which are cast by precision casting and finish machining or precision forging, and have the defects of large casting structure, long die manufacturing period and high machining difficulty. The reason is that TiAl alloy has intrinsic brittleness, poor room temperature plasticity and difficult forming.
In order to solve various problems existing in the traditional processing method of the TiAl alloy blade, additive design and additive manufacturing technology are introduced. The additive manufacturing is a new manufacturing technology, parts are prepared in a mode of accumulating materials from bottom to top, the method has the characteristics of high material utilization rate, high processing efficiency, capability of processing complex parts and the like, the 3D printing piece has the advantages of fine grains, uniform structure and excellent mechanical property, and has obvious advantages in manufacturing small-batch complex-structure special-shaped pieces, refractory difficult-to-process pieces, gradient or lattice structure parts, and the method is particularly applied to the field of engine manufacturing more and more. Due to the intrinsic brittleness of the TiAl alloy material, the laser 3D printing technology cannot preheat the printing layer at high temperature, so that the method is not suitable for processing the TiAl alloy material. The Electron beam selective melting (EBM) can realize high-temperature preheating treatment in the processing bin, can inhibit the TiAl alloy from generating cracks, and the prepared TiAl alloy part has the characteristics of fine grains, uniform tissue components and the like, the method can effectively overcome the defects of large crystalline structure, easy formation of looseness inside and composition segregation of the traditional cast TiAl material, and has the advantages of short production flow and high production efficiency, so that the method for manufacturing the TiAl alloy blade by using an Electron beam selective melting technology is needed to be provided.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a TiAl alloy blade and an additive manufacturing method thereof.
In order to achieve the purpose, the invention provides the following technical scheme:
a manufacturing method of a TiAl alloy blade comprises the following steps:
performing additive machining design and additive machining process simulation analysis on the blade model;
carrying out inverse deformation compensation design on the blade model to obtain a blade compensation model, and continuing to carry out material increase machining process simulation on the blade compensation model to obtain a compensation optimization model of the blade;
processing the attitude optimization data, the support generation data and the slicing data of the printed piece according to the compensation optimization model and exporting the processed data;
setting 3D printing process parameters according to the processed data;
wrapping an electromagnetic field environment on the forming surface of the 3D printing piece;
3D printing processing of the TiAl alloy blade is carried out under the 3D printing technological parameters and the electromagnetic field environment, and a blank is obtained;
and carrying out post-treatment on the blank to obtain a finished product TiAl alloy blade.
Further, the additive machining design and additive machining process simulation analysis of the blade model comprises:
the method comprises the steps of calculating and analyzing the overall and local deformation of the TiAl alloy blade and a stress cloud chart after the 3D printing processing process, the heat treatment process, the process of separating the TiAl alloy blade from the substrate and the support of the TiAl alloy blade are removed by designing blade machining allowance, selecting a 3D printer, setting printing parameters, creating a substrate, optimizing the posture of a printed part, supporting generation, slicing, printing, machining and manufacturing and designing the heat treatment process.
Further, the inverse deformation compensation design is carried out on the blade model, and the material increase machining process simulation is continued to obtain a compensation optimization model of the blade, and the compensation optimization model comprises the following steps:
carrying out inverse deformation compensation design on the blade model to obtain a compensation model;
and (3) continuing to perform material increase machining process simulation on the compensation model, calculating and verifying the integral and local deformation and stress distribution of the blade within a preset range, and performing iterative calculation more than twice to obtain a compensation optimization model of the blade.
Further, performing 3D printing processing on the TiAl alloy blade under the 3D printing process parameters and the electromagnetic field environment to obtain a blank, including:
controlling the vacuum degree of the processing bin to be less than or equal to 0.3Pa, setting the slice thickness to be 30-300 mu m, and setting the scanning size of the substrate to be 81-400 cm 2 The preheating temperature is set to be 1000-1300 ℃, the preheating cycle times are set to be 3-9 times, and the focusing current of the electron beam is set to be 15-48 mA.
Further, the 3D printing processing of the TiAl alloy blade is performed under the 3D printing process parameters and the electromagnetic field environment to obtain a blank, and the method further comprises the following steps:
when printing of a layer of material is completed and a powder spreading stage is started, the electron beam is temporarily closed, and current is intermittently loaded to the electromagnetic induction coil;
the parameters of the loading current and voltage are as follows: the voltage is 0.1-60 kV, and the current is 0.1-10 3 And A, the acting time of the current is 0.01-1 s, the current pause time is 0-1 s, when the current pause time is 0s, the current is constant current, and when the pause is not 0s, the current is pulse current.
Further, the 3D printing processing of the TiAl alloy blade is performed under the 3D printing process parameters and the electromagnetic field environment to obtain a blank, and the method further comprises the following steps:
the forming substrate processed by 3D printing is made of martensitic stainless steel, titanium alloy or nickel-based high-temperature alloy.
Further, the blank is post-processed to obtain a finished product TiAl alloy blade, which comprises the following steps:
separating the blank from the substrate and recovering TiAl alloy powder on the surfaces of the blank and the substrate;
and removing part support of the blank, and carrying out heat treatment, machining and surface finishing treatment on the blank to obtain a finished product TiAl alloy blade.
Further, the heat treatment comprises:
carrying out heat treatment on the blank by using a vacuum heat treatment furnace or a hot isostatic pressing furnace, then cooling the blank to room temperature along with the furnace, and taking out the blank;
the technological parameters of the heat treatment comprise: vacuum degree of 5-20X 10 -3 Pa, the heating speed is 15-25 ℃/min, the heat preservation temperature is 1150-1350 ℃, the heat preservation time is 0.5-5 h, and the cycle heat treatment frequency is 0-5.
Further, the surface finishing process includes:
polishing the blank after heat treatment by adopting machining, manual grinding and polishing, a magnetic polishing machine and vibration finishing equipment to reduce the roughness of the blank to be less than or equal to Ra1.6 mu m;
and carrying out fine polishing on the polished blank by using a plasma polishing or abrasive flow process to reduce the roughness of the blank to be less than or equal to Ra0.1 mu m.
On the other hand, the invention also discloses a TiAl alloy blade which is prepared by adopting the method.
The invention has the technical effects and advantages that:
according to the invention, the forming surface of the printed piece can be activated by performing electromagnetic field auxiliary treatment on the forming area in the electron beam 3D printing process, so that a TiAl alloy molten pool is facilitated to obtain an electromagnetic field auxiliary effect, a liquid phase in the molten pool is promoted to flow to fill pores, a compact structure is formed, grains are favorably crushed, anisotropy is reduced, and the comprehensive performance of the material is improved; the method adopts additive design, blade model inverse deformation compensation design and an electron beam 3D printing method to rapidly and efficiently prepare the TiAl alloy blade, and obtains the TiAl alloy blade part with the dimensional precision and the surface finish within the allowable range through a post-treatment process; the TiAl alloy blade prepared by the method has the advantages of high part size precision, good surface roughness, excellent performance, short production period and high material utilization rate.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
FIG. 1 is a flow chart of a manufacturing method of a TiAl alloy blade according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Fig. 1 is a flowchart of a manufacturing method of a TiAl alloy blade of the present invention, and as shown in fig. 1, the present invention provides an additive manufacturing method of a TiAl alloy blade, including:
performing additive machining design and additive machining process simulation analysis on the blade model;
carrying out inverse deformation compensation design on the blade model to obtain a blade compensation model, and continuing to carry out material increase machining process simulation on the blade compensation model to obtain a compensation optimization model of the blade;
processing data before printing and processing by using the compensation optimization model;
setting 3D printing process parameters according to the processed data;
wrapping an electromagnetic field environment on the forming surface of the 3D printing piece;
3D printing processing of the TiAl alloy blade is carried out under the 3D printing technological parameters and the electromagnetic field environment, and a blank is obtained;
and carrying out post-treatment on the blank to obtain a finished product TiAl alloy blade.
Further, the additive machining design and additive machining process simulation analysis of the blade model comprises:
the method comprises the steps of calculating and analyzing the overall and local deformation of the TiAl alloy blade and a stress cloud chart after the 3D printing processing process, the heat treatment process, the separation of the TiAl alloy blade from the substrate and the removal of the support of the TiAl alloy blade are carried out by designing blade machining allowance, selecting a 3D printer, setting printing parameters, creating a substrate, optimizing the posture of a printed part, generating a support, slicing, printing, machining and manufacturing and designing the heat treatment process.
Further, performing inverse deformation compensation design on the blade model to obtain a compensation model;
and continuously carrying out additive machining process simulation on the compensation model, calculating and verifying the integral and local deformation and stress distribution of the blade in a preset range, and carrying out iterative calculation more than two times to obtain a compensation optimization model of the blade.
And further, processing the attitude optimization data, the support generation data and the slicing data of the printed piece according to the compensation optimization model and exporting the processed data.
Further, when 3D printing processing of the TiAl alloy blade is carried out, the vacuum degree of a processing bin is controlled to be less than or equal to 0.3Pa, setting the slice thickness to be 30-300 μm, and setting the scanning size of the substrate to be 81-400 cm 2 The preheating temperature is set to be 1000-1300 ℃, the preheating cycle times are set to be 3-9 times, and the focusing current of the electron beam is set to be 15-48 mA.
Further, when printing of a layer of material is completed and a powder spreading stage is started, the electron beam is temporarily closed, and current is loaded to the induction coil intermittently; the parameters of the loading current and voltage are as follows: the voltage is 0.1-60 kV, and the current is 0.1-10 3 A, the time of current action is 0.01-1 s, the current dwell time is 0-1 s, when the current dwell time is 0s, the current is steady current, when the dwell is not 0s, the current is pulse current, according to the electromagnetic induction principle, the conductive coil can simultaneously generate a magnetic field, the magnetic field has a stirring effect on liquid metal in a molten pool, electromagnetic field auxiliary treatment is carried out on a forming area in the 3D printing process of the electron beam, the forming surface of a printing piece can be activated, the TiAl alloy molten pool can obtain the electromagnetic field auxiliary effect, liquid in the molten pool of a printing area can be promoted to flow at a higher speed to fill pores and form a compact material structure, grain breaking and anisotropy are facilitated, and the comprehensive performance of the material is improved.
Furthermore, the material of the forming substrate processed by 3D printing is martensitic stainless steel, titanium alloy or nickel-based high-temperature alloy.
Further, when the blank is subjected to post-treatment, separating the blank from the substrate and recovering TiAl alloy powder on the surfaces of the blank and the substrate; and removing part support of the blank, and carrying out heat treatment, machining and surface finishing treatment on the blank to obtain a finished product TiAl alloy blade.
Further, when the blank is subjected to heat treatment, the blank is subjected to heat treatment by using a vacuum heat treatment furnace or a hot isostatic pressing furnace, then the blank is cooled to room temperature along with the furnace, and the blank is taken out; the technological parameters of the heat treatment comprise: vacuum degree of 5-20X 10 - 3 Pa, the heating speed is 15-25 ℃/min, the heat preservation temperature is 1150-1350 ℃, the heat preservation time is 0.5-5 h, and the cycle heat treatment frequency is 0-5; the blank is subjected to heat treatment to play a role in adjusting the structure and the appearance of the TiAl alloy.
Further, when the surface of the blank after the heat treatment is finished, the blank is polished by adopting machining, manual grinding and polishing, a magnetic polishing machine and vibration finishing equipment, so that the roughness of the blank can be reduced to be less than or equal to Ra1.6 mu m; and (3) carrying out fine polishing on the polished blank by using a plasma polishing or abrasive flow process, reducing the roughness of the blank to be less than or equal to Ra0.1 mu m, and selecting the processing and polishing precision according to the requirements of the size precision and the surface smoothness of the product.
On the other hand, the invention also discloses a TiAl alloy blade which is manufactured by adopting the method, and the material of the TiAl alloy blade comprises Ti45Al8Nb, ti48Al2Nb2Cr and Ti48Al4Nb2Cr.
Examples
S1: and (3) designing a blade model by UG NX12 three-dimensional model design software, wherein the size of the blade model is 19.5 multiplied by 30 multiplied by 55mm. The method comprises the steps of adopting additive manufacturing simulation software 3D EXPERIENCE software to conduct additive manufacturing design and process simulation analysis on a blade model, calculating and analyzing the whole and local deformation amount and a stress cloud picture of a TiAl alloy blade after the 3D printing process, the heat treatment process, the separation of the TiAl alloy blade from a substrate and the removal of the support of the TiAl alloy blade are conducted through designing a blade machining allowance of 0.5-2.5 mm, selecting a 3D printer, setting printing parameters, creating a substrate of 150 x 10mm, optimizing the posture of a printing piece, supporting generation, slicing, printing, machining and designing a heat treatment process.
And S2, carrying out inverse deformation compensation design on the blade model to obtain a compensation model, importing the compensation model into simulation software, continuing to carry out additive machining process simulation, and calculating and verifying that the overall and local deformation and stress distribution of the compensation model are within an allowable range. And through not less than twice iterative calculations, finally obtaining a compensation optimization model, and determining parameters required by additive machining, wherein the method comprises the steps of setting the placing position of a three-dimensional model to be vertically placed on a blade body, adding a contour support structure, and determining the parameters of the electron beam 3D printing machining process: the powder is Ti45Al8Nb alloy spherical powder, the preheating temperature is 1000-1300 ℃, the beam spot current is 10-48 mA, the beam spot diameter is 10-150 mA, the beam spot scanning speed is 1000-7000 m/s, and a compensation optimization model file in stl format is derived.
And S3, inputting the stl file of the blade compensation optimization model into 3D printer control software Build Assembler, processing the printed part attitude optimization data, the support generation data and the slicing data, and exporting the processed data, wherein the export data is in a format of abf.
And S4, inputting the derived abf data into 3D printer Control software EBM Control, and implementing 3D printing process parameter setting.
S5, filling 30-100 kg of Ti45Al8Nb alloy powder into a powder storage bin of the 3D printer, wherein the particle size distribution of the Ti45Al8Nb alloy powder is as follows: 45-150 mu m and the fluidity of 30s/50g, completing the preparation state of the electron beam 3D printer.
S6, starting 3D printing processing of the TiAl alloy blade, and meanwhile, starting electromagnetic induction coil current around a forming plane, wherein the parameters are as follows: the voltage is 300V, the current is 100A, the time of current action is 0.5s, the current dwell time is 0.25s, an electromagnetic field environment for wrapping a printing forming surface is created, when the printer finishes printing of a layer of material and enters a powder spreading stage, the electron beam is temporarily closed, the current can be intermittently loaded to the induction coil, the powder spreading and the electron beam printing are alternately carried out until the whole printing task is finished, and the current loading to the induction coil is stopped.
And S7, after the blank is subjected to 3D printing and forming, taking out the substrate, the powder and the blank assembly from the printer, putting the substrate, the powder and the blank assembly into a special powder recovery system together, and purging and recovering Ti45Al8Nb alloy powder to separate the blank from the substrate and the powder.
S8, removing the support, and putting the blank into a hot isostatic pressing furnace and a high vacuum heat treatment furnace for treatment, wherein the vacuum degree of the heat treatment process is 5 multiplied by 10 -3 Pa, the heating rate is 15 ℃/min, the heat preservation temperature is 1150 ℃, the heat preservation time is 1h, the circulating heat treatment times are 2 times, then the blank is cooled to the room temperature along with the furnace, and the blank is taken out. And milling the blank subjected to heat treatment by adopting a machining method, wherein the surface roughness of the processed blade can reach Ra1.6 mu m, and the TiAl alloy blade part with dimensional precision and surface smoothness within an allowable range is obtained.
Through detection, a test bar prepared by the same process as the TiAl alloy blade has room temperature fracture strength of 670-770 MPa and elongation of 2.5-3.5% according to the GB/T228.1-2010 detection standard; the breaking strength of the test bar reaches 740-840 MPa at 750 ℃, and the elongation reaches 16-18%; the breaking strength of the test bar at 800 ℃ reaches 810-910 MPa, and the elongation reaches 44-46%; therefore, the performance of the TiAl alloy blade prepared by the method is greatly improved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. A method of manufacturing a TiAl alloy blade, characterized by comprising the steps of:
performing additive machining design and additive machining process simulation analysis on the blade model;
carrying out inverse deformation compensation design on the blade model to obtain a blade compensation model, and continuing to carry out material increase machining process simulation on the blade compensation model to obtain a compensation optimization model of the blade;
processing the attitude optimization data, the support generation data and the slicing data of the printed piece according to the compensation optimization model and exporting the processed data;
setting 3D printing process parameters according to the processed data;
wrapping an electromagnetic field environment on the forming surface of the 3D printing piece;
3D printing processing of the TiAl alloy blade is carried out under the 3D printing technological parameters and the electromagnetic field environment, and a blank is obtained;
and carrying out post-treatment on the blank to obtain a finished product TiAl alloy blade.
2. The method for manufacturing the TiAl alloy blade as claimed in claim 1, wherein the performing additive machining design and additive machining process simulation analysis on the blade model comprises:
the method comprises the steps of calculating and analyzing the overall and local deformation of the TiAl alloy blade and a stress cloud chart after the 3D printing processing process, the heat treatment process, the process of separating the TiAl alloy blade from the substrate and the support of the TiAl alloy blade are removed by designing blade machining allowance, selecting a 3D printer, setting printing parameters, creating a substrate, optimizing the posture of a printed part, supporting generation, slicing, printing, machining and manufacturing and designing the heat treatment process.
3. The method for manufacturing the TiAl alloy blade according to claim 1, wherein the step of performing inverse deformation compensation design on the blade model and continuing to perform additive machining process simulation to obtain a compensation optimization model of the blade comprises the following steps:
carrying out inverse deformation compensation design on the blade model to obtain a compensation model;
and continuously carrying out additive machining process simulation on the compensation model, calculating and verifying the integral and local deformation and stress distribution of the blade in a preset range, and carrying out iterative calculation more than two times to obtain a compensation optimization model of the blade.
4. The method for manufacturing the TiAl alloy blade according to claim 1, wherein the 3D printing processing of the TiAl alloy blade is performed under the 3D printing process parameters and the electromagnetic field environment to obtain a blank, and the method comprises the following steps:
controlling the vacuum degree of the processing bin to be less than or equal to 0.3Pa, setting the slice thickness to be 30-300 mu m, and setting the scanning size of the substrate to be 81-400 cm 2 The preheating temperature is set to be 1000-1300 ℃, the preheating cycle times are set to be 3-9 times, and the focusing current of the electron beam is set to be 15-48 mA.
5. The method for manufacturing the TiAl alloy blade according to claim 4, wherein the 3D printing processing of the TiAl alloy blade is performed under the 3D printing process parameters and the electromagnetic field environment to obtain a blank, and further comprising:
when printing of a layer of material is completed and a powder spreading stage is started, the electron beam is temporarily closed, and current is intermittently loaded to the electromagnetic induction coil;
the parameters of the loading current and voltage are as follows: the voltage is 0.1-60 kV, the current is 0.1-10 3 And A, the acting time of the current is 0.01-1 s, the current pause time is 0-1 s, when the current pause time is 0s, the current is constant current, and when the pause is not 0s, the current is pulse current.
6. The method for manufacturing the TiAl alloy blade according to any one of claims 4 or 5, wherein the 3D printing processing of the TiAl alloy blade is performed under the 3D printing process parameters and the electromagnetic field environment to obtain a blank, and further comprising:
the forming substrate processed by 3D printing is made of martensitic stainless steel, titanium alloy or nickel-based high-temperature alloy.
7. The method for manufacturing the TiAl alloy blade as claimed in claim 1, wherein the post-processing of the blank to obtain the finished TiAl alloy blade comprises:
separating the blank from the substrate and recovering TiAl alloy powder on the surfaces of the blank and the substrate;
and removing part support of the blank, and carrying out heat treatment, machining and surface finishing treatment on the blank to obtain a finished product TiAl alloy blade.
8. The method of claim 7, wherein the heat treating comprises:
carrying out heat treatment on the blank by using a vacuum heat treatment furnace or a hot isostatic pressing furnace, then cooling the blank to room temperature along with the furnace, and taking out the blank;
the technological parameters of the heat treatment comprise: vacuum degree of 5-20X 10 -3 Pa, the heating speed is 15-25 ℃/min, the heat preservation temperature is 1150-1350 ℃, the heat preservation time is 0.5-5 h, and the cycle heat treatment frequency is 0-5.
9. The method for manufacturing a TiAl alloy blade according to claim 7, wherein the surface finishing treatment comprises:
polishing the blank after heat treatment by adopting machining, manual grinding and polishing, a magnetic polishing machine and vibration finishing equipment to reduce the roughness of the blank to be less than or equal to Ra1.6 mu m;
and carrying out fine polishing on the polished blank by using a plasma polishing or abrasive flow process to reduce the roughness of the blank to be less than or equal to Ra0.1 mu m.
10. A TiAl alloy blade, characterized in that it is produced by a method according to any one of claims 1 to 9.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116900808A (en) * | 2023-09-14 | 2023-10-20 | 成都航空职业技术学院 | Error compensation method and system for numerical control milling deformation of aero-engine blade |
| CN116921699A (en) * | 2023-07-31 | 2023-10-24 | 连云港华鼎车轮有限公司 | Manufacturing process of lock ring for wheel type engineering machinery wheel |
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2022
- 2022-11-02 CN CN202211360099.7A patent/CN115740494A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116921699A (en) * | 2023-07-31 | 2023-10-24 | 连云港华鼎车轮有限公司 | Manufacturing process of lock ring for wheel type engineering machinery wheel |
| CN116900808A (en) * | 2023-09-14 | 2023-10-20 | 成都航空职业技术学院 | Error compensation method and system for numerical control milling deformation of aero-engine blade |
| CN116900808B (en) * | 2023-09-14 | 2023-12-26 | 成都航空职业技术学院 | Error compensation method and system for numerical control milling deformation of aero-engine blade |
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