218 results about "Machining deformation" patented technology

The embodiment of the invention provides a turning and milling combined machining deformation control method and system for a special-shaped part, and is used for the technical field of numerical control machining. The turning and milling combined machining deformation control method for the special-shaped part comprises the steps that structural feature analysis and process association marking are conducted on design data of the special-shaped part to generate a feature association data set, and clamping and process planning are conducted according to a machining constraint database and the feature association data set to generate initial turning and milling combined machining process data; cutting parameter multi-objective optimization solution is carried out on the initial turning-milling combined machining process data to obtain a turning-milling cutting parameter set, and multi-axis linkage analysis and instruction collaborative planning are carried out on the turning-milling cutting parameter set according to the equipment operation feature set to generate a combined machining control instruction set. According to the method, through part key feature recognition and risk marking, combined machining control instructions are generated after layered digital twinning verification in combination with process multi-objective optimization, and the one-time qualified rate of special-shaped part machining and turn-milling combined machining process stability are improved.

The invention discloses a preparation method for ensuring thickness uniformity and form and location tolerance of a coating of a slender shaft, the slender shaft is a slender stepped shaft-shaped part, the preparation method comprises base body processing before plating, hard chromium plating and machining after plating, in the base body processing process stage before plating, a center hole is adopted as a processing reference, finish machining is carried out according to the shape of the part, and the thickness uniformity and the form and location tolerance of the part are guaranteed. It is ensured that the form and position error and dimensional tolerance of the machined part meet the requirements; in the hard chromium plating stage, the non-chromium-plated part is protected, and the chromium-plated part is subjected to hard chromium plating; and in the post-plating machining stage, the center hole is adopted as a machining standard, post-plating rough machining is conducted firstly, then post-plating finish machining is conducted, grinding is conducted to meet the design requirement, and a plated workpiece is obtained. By the adoption of the preparation method, the problem of machining deformation of the slender shaft type structural part is thoroughly solved, the machining performance is stable, the production efficiency is high, special equipment and tools do not need to be configured, and the method is suitable for large-scale production and machining.

The invention relates to a preparation process optimization method of a zirconium alloy material with high fretting wear resistance, which comprises the following steps: setting a chemical component optimization range of a zirconium alloy, including specific proportions of tin, iron, niobium, chromium and oxygen elements; establishing a computer simulation model, and predicting the wear volume, tribological stability and microstructure evolution of the material under the fretting wear condition; then, a complete optimization scheme is output based on the model optimization homogenization treatment temperature interval, the hot working deformation range, the cold working cumulative deformation degree and the annealing system; and finally, a preparation process sequence including smelting, homogenization treatment, hot working deformation, cold working deformation and final heat treatment is implemented, the zirconium alloy material with the equiaxed grain structure is prepared, and the wear resistance of the zirconium alloy material is verified through an experimental fretting wear performance test. Compared with the prior art, the method has the advantages that through systematic component design and process parameter simulation optimization, the material performance is remarkably improved, and the application reliability is enhanced.

According to the thin-wall part machining method and device, the computer storage medium and the terminal, for a first change curve of strain energy and machining deformation in the layer-by-layer cutting process, it is ensured that the machining deformation newly added in the cutting process is smaller than the overall machining deformation by one grade with the strain energy reduced by 0.9 or above relative to the initial value as the criterion, and the machining deformation is reduced by one grade; the interference of newly increased deformation of finish machining on the machining precision is effectively restrained; the second change curve of the machining deformation of the part and the cutting thickness value of the part and the process allowance change curve are only fitted within the initial boundary range, and the curve fitting strength is reduced; the finish machining allowance when the second change curve and the process allowance change curve intersect is determined as the optimal finish machining allowance, and the requirements that the newly-added machining deformation corresponding to the finish machining allowance after cutting of each layer is minimum and the finish machining allowance needs to be larger than the deformation amount of previous machining are met; and data support is provided for improving the distribution quality of the finishing allowance.

The invention discloses a residual stress analysis method and device, a computer storage medium and a terminal.The method comprises the steps that a preset number of initial residual stress distribution data of a thin-walled workpiece blank is generated, and each initial residual stress distribution data is simulated through a finite element model; rough machining deformation field data caused by redistribution of the residual stress after the blank material is removed of each initial residual stress distribution data are obtained; in order to solve the problem that complexity in the manufacturing process needs to be considered when initial residual stress field data is obtained from rough machining deformation field data inversion, a deep neural network model used for determining the mapping relation between initial residual stress data and rough machining deformation data is established according to mapping relation data; rough machining deformation field data of actual machining is input into the deep neural network model, complex theoretical analysis and derivation are bypassed, and on the basis of not damaging the structure of the blank, the initial residual stress field prediction of the thin-walled workpiece blank is achieved.

The embodiment of the invention discloses a multi-sensor monitoring and compensating method for machining deformation of a large annular part. According to the embodiment of the invention, the feed-forward compensation amount can be generated on the basis of the predicted radial deformation amount of the stress abrupt change area in the surface radial deformation appearing time when the large annular part is machined, and then the feedback compensation amount is generated according to the deviation between the expected machining contour and the actual radial position data of the large annular part; and generating a total compensation amount according to the feedback compensation amount and the feed-forward compensation amount, and adjusting the motion trail of a cutter on the machine tool according to the total compensation amount, and the expected machining contour, the shape tolerance and the position tolerance of the large annular piece. Therefore, according to the embodiment of the invention, deformation caused by stress release can be compensated in real time in the machining process of the large annular part, and the compensation efficiency is improved.

The invention belongs to the technical field related to robot machining, and discloses a machining deformation prediction method and device for a large complex curved surface part, and the method comprises the steps: (1) extracting time domain features, frequency domain features and time-frequency domain features from a cutting force signal, a vibration signal and an acoustic emission signal collected in the machining process of the large complex curved surface part; (2) carrying out linear dimensionality reduction on the extracted features by adopting a PCA (Principal Component Analysis) algorithm; (3) inputting the features obtained by dimensionality reduction through the PCA algorithm into a double-layer LSTM neural network model, wherein the double-layer LSTM neural network model outputs a preliminary prediction value of processing deformation; and (4) inputting the features obtained through dimensionality reduction by the PCA algorithm into an XGBoost prediction model, outputting a prediction residual error by the XGBoost prediction model, and adding the initial prediction value of the machining deformation and the prediction residual error to obtain a machining deformation prediction value. According to the invention, adaptability and prediction accuracy are improved.

The application discloses a device for reducing welding and machining deformation of the end of a large-size cathode roller, which comprises a base, a pushing mechanism, a lifting mechanism, a support seat and a bearing plate, the side wall of the support seat is provided with the bearing plate, the side wall of the support seat is provided with a motor, the end of the bearing plate away from the support seat is provided with a support ring, the support ring is provided with detection welding mechanisms, the detection welding mechanisms are symmetrically arranged in two groups, after the cathode roller is clamped, the pushing mechanism and the lifting mechanism drive the support ring to be located at the center directly above the cathode roller, the distance sensor detects the distance change process of the suspension end of the swing rod, at this time, the lifting mechanism stops working, the electric wheel rotates to drive the support ring to rotate along the sliding plate, so that the welding gun welds the end of the cathode roller, when the two groups of detection welding mechanisms are arranged to weld the weld of the cathode roller, the welding efficiency of the weld of the cathode roller can be improved, and the welding deformation can be reduced.

The application discloses a machining deformation field numerical analysis method considering intermediate geometric states and application, belongs to the machining deformation control and statics simulation technical field, and comprises the following steps: calculating the workpiece displacement field generated by the residual stress rebalancing caused by the current material removal based on numerical analysis; calculating the boundary corresponding to the material boundary removed in the initial configuration according to the displacement field; removing the material in the initial configuration according to the boundary, and then performing numerical analysis again to obtain the displacement field; and finally calculating the part deformation according to the displacement field. By using the method, the geometric and stress evolution in the machining process is dynamically simulated, the limitation of the traditional numerical analysis on the simulation of the intermediate state in the machining is broken through, the machining deformation prediction precision of the aerospace complex part is improved, and reliable numerical basis is provided for process optimization.

The application discloses a bending machine deformation detection mechanism and method, which comprises a deformation sensor and a control system; the bending machine comprises a lower side plate and a slider located directly above the lower side plate, and the height of the slider can be lowered; a deformation proportionality coefficient K is built in the control system; wherein the deformation proportionality coefficient K is the ratio of the elastic deformation A of the slider to the elastic deformation B of the lower side plate; the deformation sensor is arranged on the lower side plate or the slider and can be used for detecting the elastic deformation of the lower side plate or the slider. The application can realize real-time detection of bending deformation while saving cost. Especially when bending a large-format thick plate, the bending precision of the plate can be improved, and the waste of the plate can be reduced. Especially when the application is equipped with the function of an intelligent bending production line, closed-loop real-time intelligent automatic control can be realized. Further, the application can calculate and compensate the initial deviation of the upper and lower dies, so that the installation and debugging are more convenient.

The invention relates to the technical field of machine tools, and discloses a machine tool structural part analysis method and a machine tool structural part analysis device.The machine tool structural part analysis method comprises the steps that an initial model of a machine tool is established; performing finite element analysis on the initial model under a cutting condition to obtain model deformation quantity, and determining the model deformation quantity of the initial model as complete machine deformation quantity; structural parts in the initial model are removed, and a deformation model is obtained; performing finite element analysis on the deformation model under the cutting condition to obtain model deformation quantity, and determining the model deformation quantity of the deformation model as part deformation quantity; and determining a deformation influence value of the structural member based on the component deformation quantity and the complete machine deformation quantity. According to the method, an initial model and a deformation model are established, calculation is carried out by removing boundary changing conditions of the structural parts, the influence of the related structural parts on overall deformation of the machine tool can be determined, and the deformation contribution rate and equivalent deformation of the structural parts are completely quantified.

The internal combustion engine camshaft machining deformation control method comprises the following steps that (1) a workpiece is corrected before finish machining, specifically, after workpiece rough machining and surface strengthening are completed, the workpiece is subjected to aging treatment, and center holes in the two ends of a camshaft are corrected through a numerical control lathe; (2) machine tool state adjustment: arranging a center frame according to the length of a workpiece, adjusting the position of a tailstock, and adjusting the center frame through a mandrel with a proper length; (3) machining the workpiece: mounting the workpiece on a numerical control camshaft grinding machine, and machining according to the technological process of pre-grinding a central frame clamping journal, pre-grinding other working journals, pre-grinding a cam profile, loosening all central frames, correcting and grinding the central frame clamping journal, accurately grinding the cam and accurately grinding the journal; according to the internal combustion engine camshaft machining deformation control method, the form and position precision of the working journal of the camshaft and the cam can be improved, the workpiece machining deformation degree is reduced, and the form and position precision and consistency of the working journal and the cam are guaranteed.

The present invention discloses a method for controlling deformation during the machining of large, complex ellipsoidal parts based on dynamic cutting planning: First, the blank is clamped in an initial position, a machining coordinate system is set up, and the non-contact measurement and adjustment of the reference surfaces for the internal and external shapes of the blank are completed. Subsequently, the cutting surfaces are subdivided. Based on the feature decomposition of the product, the theoretical cross-sections are compared with the measured cross-sections in the same coordinate system, and a machining area assessment is performed based on the cutting surfaces to guide the overall machining route planning and the local machining route planning.Based on the machining path planning and the available clearances, a dynamic workpiece adjustment is achieved using an adaptable support system to ensure stable machining under variable cutting depths and to solve the problem of overall deformation in complex ellipsoidal parts. In conjunction with the adaptable support, the system detects deformation of highly reinforced features in areas with large rib heights. Based on the relationship between circular displacement and remaining wall thickness, toolpath compensation is implemented to achieve precise machining compensation for local distortion.The invention solves the major difficulties in the CNC machining of large, complex, thin-walled ellipsoidal parts with regard to accurately ensuring the remaining wall thickness, compensating for local deformations, and controlling the overall deformation, which further improves the reliability of the overall production of such parts.

The utility model discloses a kind of processing devices for preventing magnesium alloy steering cast pipe center hole processing deformation, belong to magnesium alloy steering cast pipe processing technical field, including four-axis machining rotary table, the movable end of four-axis machining rotary table is fixedly connected with base plate;The upper end of base plate is installed with double-station processing clamping mechanism;The magnesium alloy steering cast pipe body is constituted by first processing surface, second processing surface and center hole processing surface;The double-station processing clamping mechanism includes first placement limiting component and second placement limiting component.By the above-mentioned mode, the compacting force of the device to the magnesium alloy steering cast pipe body can be flexibly adjusted;Avoid the center hole processing surface of the magnesium alloy steering cast pipe body during rough and fine machining, the problem that the diameter of the center hole processing surface appears out-of-tolerance, roundness out-of-tolerance and the magnesium alloy steering cast pipe body appears deformation caused by continuous compacting force.

This invention relates to a method for preparing high-performance aluminum alloy radiator plates. The method involves controlling the iron-silicon ratio of the main impurity component in the melt to be no less than 1.9 to reduce internal cracks in the cast billet and decrease the machining deformation rate of the finished product. This is achieved by adding aluminum-titanium alloy and a grain refiner in the furnace and online runner, while ensuring that the titanium content in the aluminum alloy ingot is maintained within a reasonable range, resulting in an ingot grain size ≤1. This improves the mechanical properties, uniform microstructure, and refined grains of the aluminum alloy radiator plate. Simultaneously, a small amount of copper is added, and the final rolling temperature is controlled at 330-360℃, resulting in fully recrystallized grains within the aluminum alloy plate. This improves the strength of the aluminum alloy radiator plate while eliminating anisotropy in its internal mechanical properties and reducing internal stress, ultimately yielding a high-performance aluminum alloy radiator plate.

The application discloses a kind of coaxial hole finishing methods of multilayer ear piece, comprising the following steps: 1) inject liquid wax between ear piece, after solidification, find the right part clamped and fixed on the workbench of machine tool;2) select short drill bit, process the target hole of first end two layers of ear piece of part;3) replace long drill bit, the target hole of all ear piece of part first end is drilled through;4) the target hole on each layer ear piece of part first end is milled and is expanded;5) the target hole on each layer ear piece of part first end is roughly reamed;6) remove the wax between each layer ear piece of part first end, the target hole on each layer ear piece of part first end is precisely reamed;7) repeat step 2)-6) to the target hole on each layer ear piece of part second end is finished.The processing method of the application adopts the mode of machining, no remelt layer is left in the orifice, and the machining precision is high.

The invention discloses a primary and secondary mirror support machining device and a primary and secondary mirror support machining method, and the primary and secondary mirror support machining device comprises a bottom plate, a supporting cylinder, a plurality of arc-shaped fixing seats, a sensor mounting seat and a display device. On one hand, the outer side surface of the arc-shaped elastic sheet is fixedly connected with the metal induction block, and the metal induction block fills a pit formed by the outer side surface of the arc-shaped elastic sheet and the radial through hole, so that when the inner side surface of the arc-shaped elastic sheet is machined by a cutter, a second bolt on the sensor mounting seat can apply an abutting force to the metal induction block; the arc-shaped elastic piece can be prevented from being elastically bent and deformed in the radial direction under the acting force of a cutter, and therefore the inner side face of the arc-shaped elastic piece can be precisely subjected to finish machining. And on the other hand, in the finish machining process of the arc-shaped elastic piece, an operator can adjust machining parameters in real time according to the machining deformation amount of the arc-shaped elastic piece, and therefore the machining deformation of the arc-shaped elastic piece is within a proper range.

The application belongs to a kind of shell processing method, aiming at the technical problems of low machining precision and easy deformation during the processing of hemispherical shell, provides a kind of hemispherical shell and its processing method, by optimizing the structure shape of raw material blank, the material blank consumption is reduced by about 10%, in the processing process, the clamping position is close to the processing position by optimizing the process clamping step, so that the machining process can increase the rough machining cutting amount, and the clamping positioning can be repeated, the positioning accuracy is improved, the production process is easy to operate, according to the material and cutting performance of the hemispherical part, by using the processing technology and tooling, the machining deformation of the hemispherical part is greatly reduced, and the qualified rate of batch production is effectively improved.

The invention provides a high-conductivity free-cutting copper alloy material and a preparation method thereof, and belongs to the technical field of alloy smelting. The preparation method of the high-conductivity free-cutting copper alloy material comprises the following steps: (1) smelting: heating and melting cathode copper, and covering with crystalline flake graphite in the melting process; and boron-copper alloy deoxidation, high-purity tellurium and high-purity iron powder are added. A graphite bell jar is used for adding. The temperature is increased to 1200-1250 DEG C, and heat preservation is conducted for 15-30 min so that alloy elements can be homogenized; adjusting the furnace temperature to 1170-1190 DEG C, and casting into an ingot through a high-purity graphite mold; (2) hot extrusion forming; (3) pickling and hydraulic drawing; and (4) straightening and sizing to obtain the required copper alloy material. According to the copper alloy material, at the room temperature (25 DEG C), the conductivity is larger than or equal to 90% IACS, the machinability is 80% or above higher than that of an HPb63-3 material in the same state, and the tensile strength is larger than or equal to 350 MPa when the cold machining deformation is 50%.

The application discloses a 1000MPa-grade extra-thick hydroelectric steel with low strain aging sensitivity, and chemical components and mass percentages of the steel include the following: C: 0.05%-0.13%, Si: 0.15%-0.35%, Mn: 0.8%-1.2%, Ni: 1.8%-2.2%, Cr: 0.3%-0.6%, Mo: 0.3%-0.6%, V: 0.03%-0.07%, Ti: 0.01%-0.03%, Nb: 0.02%-0.05%, Alt: 0.02-0.05%, S≤0.002%, P≤0.008%, N≤0.008%, and the rest is Fe and inevitable impurity elements. The application has the advantages that the steel plate can still maintain extremely low strain aging sensitivity after cold working deformation, and a stable dislocation network and nanometer precipitated phase are introduced by using a specific thermal mechanical treatment process.

The invention provides an ultra-precision machining machine tool of a double-tool-rest oppositely-arranged roller mold and a machining method of the ultra-precision machining machine tool. The ultra-precision machining machine tool comprises a main shaft system, a double-tool-rest system, an intelligent quick-change platform and a control system. The two tool rest systems are located on the two sides of a workpiece and oppositely arranged at 180 degrees, self-balance of radial cutting force is achieved, and machining deformation of the roller with the large length-diameter ratio is effectively restrained. The intelligent quick change platform adopts zero point positioning, RFID identification and medium quick docking technologies to realize quick change and automatic parameter reconstruction of functional modules such as turning, fly cutting and measurement. Self-adaptive control over the posture of the cutter is achieved. The machining precision and efficiency of the large-size roller mold are effectively improved, and turning, milling and measuring integrated manufacturing of a complex microstructure is achieved.

The invention discloses a method and a system for regulating and controlling residual stress of a high-strength aluminum alloy thin-wall ribbed member. The invention relates to the field of material processing, and aims to solve the problems that in the prior art, macro-micro coupling residual stress of a high-strength aluminum alloy thin-wall ribbed component is difficult to systematically and cooperatively regulate and control, and processing deformation, size out-of-tolerance and stress corrosion cracking are easily caused. The method comprises the steps that tensile preload is applied to the component, 0.2%-0.8% of global inelastic strain is generated, and unloading is carried out after load holding; high-frequency ultrasonic vibration is applied to the surface of the component, and the local alternating stress amplitude is not lower than 10% of the local residual stress value of a corresponding area; the lowest temperature is less than or equal to-150 DEG C, and the heating and cooling rate is controlled between 0.5 DEG C / min and 5 DEG C / min. After being treated by the method, the residual stress peak value of the component is obviously reduced, the dimensional stability is greatly improved, the microstructure is optimized, and the service performance is enhanced.

The application discloses a hard state GH5605 high-temperature alloy cold-rolled strip, which is cold-rolled by adopting a deformation rate of 30%-45%, and is heat-treated in a temperature range of 1165-1230 DEG C in a continuous heat treatment furnace in a protective atmosphere so as to continue cold-rolling; and then is annealed in a temperature range of 950-980 DEG C in a continuous heat treatment furnace in a protective atmosphere, so that the ability of bearing bending plastic deformation is improved under the premise that the strength and hardness are basically unchanged. The application has the following advantages: the process design is reasonable, including cold-rolling deformation process, intermediate softening annealing process and recovery heat treatment process; in particular, the recovery temperature is 950-980 DEG C, and the heat treatment at this temperature can improve the ability of bearing bending plastic deformation under the premise that the strength and hardness are basically unchanged, which cannot be achieved by the existing theoretical recovery temperature (0.25-0.3)T melting point (T melting point is the absolute temperature of the melting point of the metal).

The application discloses a kind of milling equipment for profile processing, belong to profile milling technical field, including frame body mechanism;Frame body mechanism is provided with the milling mechanism for being milled to profile and the clamping mechanism for being clamped and conveying to the profile to be processed;The present application can realize the continuous, automatic processing of long profile, significantly improve production efficiency, reduce manual intervention;The present application adopts the switchable tool holder structure controlled by electromagnet, combined with switching motor drive, can be quickly, accurately converted between milling cutter and drill bit, without manual tool changing, meet complex processing needs, improve processing flexibility;The clamping mechanism of the present application is designed with bidirectional clamping of inner electric cylinder drive, cooperates with the linkage structure of slope block and jacking roller, can firmly fix long profile, prevent processing deformation, can also realize automatic lifting and conveying, ensure that processing position is accurately adjusted, improve processing precision.

The invention relates to a thin-wall component machining deformation control method which comprises the following steps that a tool is used for cutting a blank, a core shell is manufactured, the core shell is provided with a main shell body and an auxiliary shell body, the outer diameter of the main shell body is larger than that of the auxiliary shell body, a main end hole is further formed in the main shell body, an auxiliary end hole is further formed in the auxiliary shell body, and a process block is further arranged in the auxiliary end hole; a protective belt is wound on the surface of the main shell, so that the core shell and the protective belt form a core shell assembly; partial materials of the main shell and the protective belt are cut off through a cutter, feature holes are formed in the surface of the core shell assembly, and then the cutter is used for cutting off the process blocks; and after the core shell assembly, the positioning plate and the machine tool spindle are separated from one another, machining is finished. By adopting the technical scheme provided by the invention, after the residual thermal stress in the core shell is greatly released by changing the process sequence, the protection belt is wound, and then the characteristic hole is formed by cutting, so that the shrinkage deformation difference between the protection belt and the core shell is reduced, and the machining precision and the appearance quality of the core shell assembly are improved.

The invention discloses a processing quality control system and method adaptive to stainless steel hot working, relates to the technical field of processing quality control, and solves the technical problems that in the prior art, each link of stainless steel cannot be monitored in a targeted manner in each flow of a hot working process, and data needing to be monitored cannot be obtained by combining an intelligent algorithm. The heating stage control unit is used for analyzing and controlling a heating stage in a stainless steel hot working process; after heating stage control is completed, stainless steel processing enters a deformation stage; the deformation stage control unit is used for analyzing and controlling the stainless steel machining deformation stage; and the cooling stage control unit is used for analyzing and controlling the cooling stage of the stainless steel processing technology.

The application discloses a high-strength alpha+beta titanium alloy suitable for 500 DEG C and a preparation method thereof, which comprises Ti, Al, V, Mo, Nb, Zr and other impurity elements, and the mass percentage (wt.%) of alloy components is as follows: Al is 6.2-7.2, V is 1.5-2.5, Mo is 1.5-2.5, Nb is 0.5-1.5, Zr is 13.5-14.5, Mn is less than or equal to 0.02, C is less than or equal to 0.02, Ni is less than or equal to 0.01, Si is less than or equal to 0.20, Sn is less than or equal to 0.20, Cr is less than or equal to 0.04, O is less than or equal to 0.02, P is less than or equal to 0.01, S is less than or equal to 0.01, N is less than or equal to 0.006, and Ti is the balance. p The application realizes that the alloy has a specific microstructure of a bimodal structure composed of primary alpha phase and transformed beta phase by alloy design, the primary equiaxial alpha s The content of the secondary alpha s The width of the secondary alpha s The alpha T / beta The application forms an alpha The application has excellent thermal stability and thermal strength, and no harmful phase is generated after aging at 550 DEG C. Meanwhile, the alloy has good mechanical properties and excellent processing deformation capacity, the yield strength at room temperature is more than 1250 MPa, the tensile strength at room temperature is more than 1300 MPa, the plasticity at room temperature is more than 7%, and the tensile strength at 500 DEG C is more than 600 MPa, so the application discloses a new high-strength titanium alloy suitable for 500 DEG C.

The application discloses an online residual stress prediction method considering geometry-process-physical quantity, adopts a method combining experiments and finite element simulation models to create a multi-channel one-dimensional vector data set of a pre-machining residual stress field, cutting force, a cutting layer and a post-machining stress field, establishes a deep learning network model, uses the multi-channel one-dimensional vector data set to train the deep learning network model, and obtains a stress field prediction model; cutting force data in a machining process is collected online and input into the stress field prediction model, and the stress field prediction model outputs a post-machining residual stress field prediction result. The application can online predict a three-dimensional residual stress field state in a part, is expected to become a replacement scheme of traditional finite element simulation technology, further realizes digital twinning of geometry-physical quantity in a machining process, and provides a basis for a model for predicting machining deformation based on residual stress.

This invention relates to a method for controlling deformation during the processing of thin-walled components, comprising the following steps: machining a blank using a cutting tool to form a core shell, the core shell having a main shell and a secondary shell, the outer diameter of the main shell being larger than that of the secondary shell; the main shell also having a main end hole, and the secondary shell also having a secondary end hole, with a process block inside the secondary end hole; wrapping a protective strip around the surface of the main shell, forming a core shell assembly with the core shell and the protective strip; removing a portion of the material from the main shell and the protective strip using a cutting tool to form a feature hole on the surface of the core shell assembly; then removing the process block using another cutting tool; and finally separating the core shell assembly, the positioning plate, and the machine tool spindle to complete the processing. By changing the process sequence, the residual thermal stress inside the core shell is significantly released before wrapping the protective strip and then machining to form the feature hole, reducing the difference in shrinkage deformation between the protective strip and the core shell, thus improving processing accuracy and the appearance quality of the core shell assembly.

The present application belongs to the field of aero-engine part clamping, and particularly relates to a combined clamping method for ceramic matrix composite segmented cylindrical structure. First, clamping of a workpiece is performed, and two sets of positioning pins are used to connect the workpiece lower rib plate and the fixture positioning reference surface; then, a bolt is used to clamp and fix the lower pressing plate, the workpiece lower rib plate and the fixture positioning reference surface, the pointers of two micrometers are placed on the inner wall surface of the workpiece between the upper rib plate and the lower rib plate, and the initial reading of the micrometer is zero; two sets of combined positioning pins are used to penetrate the pin hole I on the upper pressing plate and the workpiece upper rib plate and the upper support plate for clamping and fixing, in the process, the bolt connecting the support seat and the upper pressing plate is repeatedly adjusted to ensure that the micrometer reading does not change more than the limit value in the clamped state of the workpiece, indicating that the clamping of a workpiece is completed; the above steps are repeated to complete the clamping of the entire cylindrical structure; through the above method, the machining deformation of the cylindrical structure is effectively alleviated, and the machining precision is significantly improved.