821 results about "Thin wall" patented technology

The invention discloses an injection molding process for a plastic part of an air purifier, and relates to the technical field of injection molding processes. Multi-area dynamic mold temperature adjustment is performed, a plurality of temperature control areas are divided according to the thin wall and curved surface structure characteristics of the plastic part, the temperature is adjusted in real time, stress concentration and deformation are remarkably reduced, and the service life of the plastic part is prolonged. The problem of shrinkage stress of a thin-wall area is solved in a targeted mode, cooling of a thick area is accelerated, meanwhile, real-time temperature control and deformation compensation are controlled in a linkage mode, the temperature and the cooling rate are dynamically adjusted according to deformation data monitored in real time, and the deformation trend is predicted, so that pre-deformation compensation is provided, warping of the thin-wall area and the curved surface area is controlled, and deformation of the thin-wall area and the curved surface area is controlled. The stability of the plastic part in the forming process is kept, and the product precision is improved; in addition, simulation prediction and mold parameter adjustment are carried out, cooling requirements of different areas are adjusted, the temperature difference between the thin wall and the curved surface area is reduced, and the whole cooling process is more efficient.

The invention discloses a deterministic cutting compensation processing method for an infrared thin-wall optical element. The method comprises the following steps: S1, acquiring an initial surface shape of a workpiece; the method comprises the following steps: measuring an initial surface shape of a thin-wall optical element to be machined through an ultra-precision machine tool in-situ measurement technology to obtain a surface shape outline rho (x, y), and calculating a material removal amount deltaz (x, y) at each coordinate position according to a designed surface shape outline z (x, y), deltaz (x, y) = rho (x, y)-z (x, y); s2, elastic deformation prediction of clamping stress; based on a finite element simulation model, three-dimensional space numerical distribution simulation is conducted on clamping force distribution in the machining process, and element elastic deformation epsilon (x, y) caused by clamping stress is predicted; integrating the elastic deformation amount with the initial material removal amount to obtain a new material removal amount z '(x, y); s3, deformation prediction of the machining residual stress element; s4, generating a non-uniform material removal compensation track; and S5, non-uniform cutting compensation machining based on slow cutter servo is carried out.

The invention relates to the technical field of defect detection, and discloses a Babbitt metal coating surfacing thin-wall layer defect detection method and device. The method comprises the following steps: carrying out multi-source detection data acquisition, multi-domain transformation and filtering enhancement on a babbitt metal coating, and obtaining preprocessed multi-source initial coating detection data to carry out interface-tissue-defect mapping, so as to obtain unified representation of an internal tissue structure of the coating; performing progressive fusion of a coating depth structure and extraction of coating defect morphology and structural features on the unified feature representation to obtain preliminary defect semantic features, and performing feature weighting calculation of defect morphology on the preliminary defect semantic features to obtain initial defect semantic features; and carrying out bearing strength and shear strength calculation and fatigue life prediction on the initial defect semantic features to obtain a final detection result. According to the method, the defects of the thin-wall layer coated and surfaced by the babbitt metal can be efficiently and accurately detected.

The invention discloses a large thin-wall complex component deformation field real-time prediction method based on digital twinning, belongs to the technical field of large thin-wall complex component high-precision machining, and relates to the large thin-wall complex component deformation field real-time prediction method based on digital twinning. The method comprises the following steps: firstly, constructing a large spacecraft cabin digital twin system, then constructing a deformation prediction model based on a multi-dimensional data interpolation algorithm, obtaining workpiece key point deformation through a displacement sensor, giving a deformation correction model based on measured data weighted compensation on the basis of data acquisition, and finally obtaining a deformation prediction model based on measured data weighted compensation. And a large number of high-precision prediction data samples are reduced and then are further corrected to improve the prediction precision and efficiency. According to the invention, a data visualization mode is adopted, the deformation of the component at each rotation angle and temperature is dynamically displayed, and the deformation condition of the to-be-processed surface of the large cabin component can be grasped in advance. And a deformation correction model based on measured data weighted compensation is given, so that the production cost of enterprises is reduced, and the machining precision and efficiency are improved.

The invention belongs to the technical field of solid-liquid phase change heat dissipation, and discloses a memory alloy-based phase change expansion buffer structure, which comprises an elastic structure, a supporting structure, a thin wall, a cavity, a flaring, an electronic device, a heat sink, fins, a connecting structure and a phase change material, the thin wall is made of shape memory alloy and separates the internal cavity and the external phase-change material, the internal cavity is communicated with the external environment through the flaring, and in the flying process of the aerospace vehicle, external airflow flows into the flaring to take away heat stored by the phase-change material continuously. Based on the shape memory function of the memory alloy, additional space expansion buffering can be provided for the phase change material when the temperature changes, and stress damage caused by phase change expansion is avoided. The memory alloy thin wall and the elastic supporting structure are combined, the structure is simple, no moving part exists, circulating work in the high-temperature environment and the low-temperature environment can be achieved, local hot spots caused by internal gap movement of the phase change material in the circulating phase change process are reduced, and heat transfer deterioration is avoided.

A putter-type golf club head comprises a unitary construction metallic frame having a thin wall crown region, and a crown damping member attached to thin wall crown region. The unitary construction metallic frame has a frame mass of 250-370 grams, a frame density of at least 2.5 g / cc, a frame length of 40-130 mm, a frame width of 75-130 mm, a frame height of 17-30 mm, a frame front forming a portion of a striking face, a frame rear, a frame top, and a frame bottom, wherein the frame top includes a thin wall crown region having a TWCR thickness of 0.6-1.2 mm, a TWCR length, a TWCR width, and a TWCR area of at least 600 mm2.

The invention provides a topology and morphology integrated optimization design method for a thin-walled structure. The method comprises the steps that 1, a finite element model is established according to design requirements; 2, extracting a thin-wall structure morphology distribution field # imgabs0 # through two-step partial differential equation filtering and Heavide projection operation; 3, constructing a material attribute rational approximation model in combination with the thin-wall morphology distribution field # imgabs1 # and the topological density field v obtained in the step 2, thereby obtaining an elastic modulus E and mass rho in a design domain; 4, performing finite element analysis in combination with the material interpolation model, and calculating the flexibility of the structure; 5, solving to obtain the sensitivity of the structure flexibility and the quality relative to the design variables; step 6, updating the morphology design variable mu and the topology design variable v of the thin plate by adopting a moving asymptote method; and step 7, when a convergence condition is satisfied, stopping optimization iteration and outputting an optimization result. According to the method, the maximum forming angle of the thin-wall structure is controlled by adjusting the filtering radius of the anisotropic filter, and the stamping forming process is met.

The invention relates to the technical field of honeycomb ceramic materials, in particular to a cordierite honeycomb ceramic material with low heat capacity and high specific surface area and a preparation method thereof. The pug comprises an inorganic solid component, an organic component and water, the inorganic solid component comprises narrow-particle-size-distribution spherical magnesium hydroxide, spherical aluminum hydroxide and spherical fused silicon dioxide; the particle size D50 of the narrow-particle-size-distribution spherical magnesium hydroxide powder is 0.1-2 microns, and the particle size D97 is smaller than or equal to 20 microns; the particle size D50 of the spherical aluminum hydroxide powder is 1-6 [mu] m, and the particle size D97 is less than or equal to 20 [mu] m; the particle size D50 of the spherical fused silica powder is 6-12 [mu] m, the particle size D97 is less than or equal to 20 [mu] m, and the sphericity is greater than or equal to 98%. The method is low in extrusion pressure, the obtained material is high in pore density, meanwhile, high porosity can be achieved without adding a pore-forming agent, and the ultra-thin wall is achieved; the composite material can be applied to various requirements of low heat capacity and high specific surface area.

A putter-type golf club head comprises a unitary construction metallic frame having a thin wall crown region, and a crown damping member attached to thin wall crown region. The unitary construction metallic frame has a frame mass of 250-370 grams, a frame density of at least 2.5 g / cc, a frame length of 40-130 mm, a frame width of 75-130 mm, a frame height of 17-30 mm, a frame front forming a portion of a striking face, a frame rear, a frame top, and a frame bottom, wherein the frame top includes a thin wall crown region having a TWCR thickness of 0.6-1.2 mm, a TWCR length, a TWCR width, and a TWCR area of at least 600 mm2.

The invention relates to a variable layer thickness printing method based on SLM (selective laser melting) forming part characteristics, which comprises the following specific steps of: dividing a part into an external surface / thin wall of a quality priority part and an internal filling / entity of an efficiency priority part according to the part characteristics and use performance; respectively slicing the quality priority part and the efficiency priority part obtained by the S I by using slicing software according to the required layer thickness, and setting a proper scanning sequence and an optimized scanning strategy for the sliced model; large-layer-thickness process parameters are given to the efficiency priority part, small-layer-thickness process parameters are given to the quality priority part, and a workpiece or a sample with the good surface metallurgy quality is obtained through SLM printing. A set of complete scheme for improving the printing efficiency through a large and small layer thickness method is formed, the surface metallographic phase of the finished product has no other defects except pores, and the effect is good.

The invention belongs to the technical field of metal additive manufacturing, and relates to a preparation method of a large-size thin-wall structure based on magnetic field regulation and control of laser directional energy deposition. According to the method, the part forming area is filled with the protective gas, the oxygen content of the forming area is 100 ppm or below, and oxidation and inclusion pollution of alloy in the forming process are avoided. By starting the electromagnetic field generator, a stable uniform magnetic field is formed in a part forming area, the metallurgical behavior of a molten pool is regulated and controlled through the thermal damping effect and the thermal electromagnetic convection effect generated by the magnetic field in the molten pool, and optimization of the grain structure is achieved. A laser cladding head is started, powder metal materials are conveyed to the position of a molten pool through powder carrying gas, and the powder metal materials are molten through laser to form a stable molten pool; and a laser cladding head is controlled to scan in a uniform magnetic field area according to a set track to carry out circulating deposition, and light stopping is carried out every time deposition of one layer is completed, so that heat of a deposition layer is released, and heat accumulation is reduced until part forming is completed.

The invention discloses a dynamic fatigue testing machine for a metal material and a testing method, aiming at a thin-wall round tube with a hole, the method comprises the following steps: projecting a speckle pattern in a hole area of a sample by adopting an infrared light source, and respectively collecting sample images containing the speckle pattern and without the speckle pattern through a binocular DIC system; continuously recording load-displacement data and an image sequence containing or not containing speckles in the test process; on the basis of difference analysis between the image sequence containing the speckles and the image sequence not containing the speckles, interference areas caused by the speckles are recognized and eliminated; and carrying out DIC strain calculation based on the corrected image sequence containing the speckles. According to the invention, invisible infrared light of a conventional lens is used as a speckle light source to obtain an image sequence containing speckles, an image sequence without speckles is acquired through imaging of a reflector and is used as a net field to correct a speckle field, the interference phenomenon is eliminated, accurate monitoring of the DIC strain at the notch is realized, and the accuracy of the DIC strain at the notch is improved. The accurate analysis on the fatigue characteristic of the thin-wall round pipe with the hole is improved.

The invention discloses a thin-wall part mirror image milling machining process parameter optimization method and a related device, and relates to the technical field of thin-wall part mirror image milling machining. The multi-objective optimization model takes maximization of the material removal rate and minimization of the surface roughness as optimization objectives, and takes milling force constraint, supporting force constraint, thin-walled workpiece mirror image milling chatter stability domain constraint and machining deformation constraint as constraint conditions, optimization solution is carried out on the multi-objective optimization model, optimal process parameters are obtained, and the optimal process parameters are obtained. Due to the fact that the modal parameter time varying is considered in the thin-wall part mirror image milling chatter stability domain constraint in the multi-objective optimization model, the influence of the modal parameter time varying on the thin-wall part mirror image milling machining process parameters can be considered, the thin-wall part mirror image milling machining process parameters are optimized better, practicability is high, and the method is suitable for large-scale popularization and application. And an actual machining production process of a thin-wall part mirror image milling machining technology can be guided.

The invention belongs to the technical field of structural damage positioning, and particularly relates to a thin-wall structural damage positioning method and device based on curvature modal shape. The method comprises the following steps: S1, obtaining modal shape data of a structure; s2, calculating a curvature modal shape corresponding to the modal shape data by using a Gaussian-Laplacian operator; s3, decomposing the curvature modal shape into a low-rank matrix L and a damage position indication matrix B, and performing spatial continuity constraint on the matrix B by using a Markov random field; and S4, determining a low-rank matrix L by taking the fact that the rank of the low-rank matrix L is smaller than a set value as a target, solving a damage position indication matrix B by using a first-order Markov random field model, and performing damage positioning according to the damage position indication matrix B. According to the method, a reference signal in a healthy state is not needed, the robustness to noise is improved, and the damage feature information in the multi-order modal shape can be fused and processed.

The invention discloses a 3D printing method for a permalloy thin-wall part. The 3D printing method comprises the steps that three-dimensional modeling and model data processing are conducted on the thin-wall part; the processed model is imported into 3D printing equipment for slicing and printing path planning, the placing mode and the machining direction of the parts are set, and a printing program is generated; printing parameters are set, so that the model does not have filling parameters during slicing and only standard contour scanning parameters are reserved, and printing is performed based on a printing program; and after printing is completed, the part is cleaned out of the printing equipment and cut off from the base plate, and the printed thin-wall part is obtained. If the filling parameter is opened, the surrounding powder can be semi-melted by the heat dissipation energy when the internal entity is sintered, and the wall thickness can exceed the required size. The printing parameters are set, so that the model has no filling parameters during slicing, only standard contour scanning parameters are reserved, the wall thickness of the part can be close to the required size only by enabling a laser spot to scan a circle along the contour of the model, and therefore the printing efficiency and the forming quality of the permalloy thin-wall part are improved.

The invention relates to an additive repairing method for a special-shaped curved surface of a large-size thin-wall component, belongs to the technical field of metal additive manufacturing, and solves the problems of low profile precision, poor aerodynamic layout and difficulty in meeting high-speed flight due to local deformation of the special-shaped curved surface of the large-size thin-wall SLM component. The invention discloses a large-size ultrathin component special-shaped curved surface additive repairing method. The method comprises the following steps that S1, a component profile is scanned and compared with a standard model; s2, polishing the surface of a product repair area; s3, repairing path planning; s4, preparing equipment and raw materials; s5, component laser additive repairing is conducted; s6, detecting a cladding layer; s7, heat treatment of the component; and S8, product detection. And on-demand repair and high-precision shape control of the SLM component in the complex geometrical shape are achieved. Local concave low-stress repair of the large-size thin-wall component is achieved, the method is suitable for large-scale engineering repair manufacturing of the component, and the problem of secondary deformation generated in the repair process of surfacing, traditional laser cladding and other technological methods is effectively solved.

The invention discloses a special module for cooling forming of a polyurethane elastomer and a cooling method of the special module. The cooling method comprises the following steps that the polyurethane elastomer is pretreated, a partition heating strategy is adopted to ensure that the temperatures of materials are consistent, the preheated materials are placed into a mold, the temperatures of all areas are dynamically adjusted through a mold temperature control system, and the materials are cooled to be uniform; a three-stage cooling strategy is implemented, the flow and the flow speed of cooling liquid are gradually adjusted in the initial stage, the transition stage and the balance stage so as to balance the temperature inside and outside the mold, the self-adaptive cooling control technology is adopted for complex geometric and thin-wall structures, and the flow of the cooling liquid is dynamically adjusted according to wall thickness and temperature data monitored in real time; and the cooling efficiency is optimized through a cooling liquid circulating and reusing mechanism, and the temperature of the mold is adjusted and residues are cleared away after cooling is completed through an intelligent temperature control system. The invention provides an efficient, energy-saving and accurate cooling forming method which is suitable for production of polyurethane elastomers.

The invention belongs to the technical field of titanium-based thin-wall component machining, and discloses a method for machining a high-temperature-resistant titanium-based thin-wall component through cold spraying additive-hot pressing and the like. A titanium-based layered gradient structure prefabricated blank is prepared mainly through a cold spraying method, and machining of the high-performance and high-temperature-resistant titanium-based thin-wall component is achieved in combination with a subsequent equal material technology. The processing and preparing process comprises the steps that the component content of the titanium-based composite powder is determined; preparing composite powder; carrying out cold spraying additive printing to obtain a layered gradient preformed thin-wall blank; and carrying out reaction hot pressing to form the high-temperature-resistant thin-wall component. By means of the method, high-production-efficiency, low-cost and high-performance manufacturing of the high-temperature-resistant layered gradient titanium-based composite material or the titanium-aluminum intermetallic compound thin-wall component can be achieved; the high-temperature-resistant thin-wall component with the maximum service temperature of 800 DEG C can be machined and prepared according to the target service temperature requirement, and customization of the service performance can be achieved according to the mechanical property requirement of the component.

A moving part of the short flexible cylinder active complex parallel radial harmonic transmission is composed of a thin-wall composite short flexible cylinder and two rolling wave generators with roller pins or ball-retainer assemblies. A flexible bearing low-speed moving ring raceway is integrated on one side of the gear, and a full-cylinder-length gear is arranged on the other side of the gear; the two semi-short shafts are fixedly connected to the two ends of a motor rotor respectively, are integrated with flexible bearing high-speed moving ring raceways and are the same in structure size, and a semi-short shaft at one end needs to be coplanar with a semi-long shaft at the other end, so that the two ends of the semi-short shafts generate time-varying radial antisymmetric deformation; the static part is composed of end covers which are fixedly connected to the two ends of the motor stator and provided with rigid gears. A double-convex-arc raceway of a high-speed moving ring of the flexible needle bearing is designed, a convexity needle roller with the middle concave structure dynamically constraining the axial movement amount of a short flexible cylinder and a retainer and various structures facilitating rolling body assembly are used, and a waveform raceway calculation formula of a wave generator for the needle roller is given; therefore, the radial size and the axial size of the active complex radial harmonic transmission can be reduced on the basis of ensuring the transmission precision and the bearing capacity.

The invention discloses a thin-wall surface deformation measurement method and device based on a Kriging model, and a medium. The method comprises the following steps: S1, generating an initial measurement point; s2, a Kriging model is constructed; s3, dynamically selecting a sampling mode; s4, acquiring a sampling point to be detected; s5, the deformation degree of the thin-wall surface is obtained through actual measurement; and S6, evaluating and iterating. Through prediction and selection of iterative sampling points and in combination with a dynamic adjustment sampling strategy, the number of measurement points is effectively reduced, and the method can overcome the problem of measurement errors caused by coordinate deviation in AACMM handheld measurement. Even if deviation exists between the position of an actual measurement point and the position of a theoretical sampling point, the method still can accurately capture the deformation degree of the thin-wall surface through prediction and iterative optimization of the Kriging model, the reliability of a measurement result is ensured, and the measurement precision, the measurement efficiency, the stability of the method implementation and the applicability and robustness of different workpiece applications are improved.

The invention provides a cavity thin-wall part printing method and system, a storage medium and equipment, and the method comprises the step of adopting a cavity part regional printing processing method with different forming parameters. A thin-wall cavity part of a part is independently split into an integral part through three-dimensional modeling software, a main body structure part and a thin-wall cavity structure part are split into a plurality of parts, and different filling printing parameters are adopted for machining the parts of different structure parts. By means of the printing method, heat accumulation can be effectively shared, distribution of residual stress is reduced, finally, the size structure precision of the thin-wall part is effectively guaranteed, and the printing success rate of the complex cavity part is increased.

The invention discloses a tool for rapid clamping of thin-wall sleeve parts, mainly relates to the technical field of thin-wall sleeve part clamping, and comprises a fixed base, a housing is arranged at the upper end of the fixed base, a rotating cam is rotatably mounted in the fixed base, clamping plates are slidably mounted on the periphery of the rotating cam, and a rotating rod is connected to the rotating cam. A limiting cone sliding plate is arranged in the rotating rod, and an eccentric handle is arranged on the limiting cone sliding plate; rapid clamping of the thin-wall part can be achieved.

The invention relates to a method for forming a GH4169 alloy thin-wall ring piece, which comprises the following steps of: forging two pieces in the height direction in a combined manner, and designing a specific forging drawing, preparing a bar material, manufacturing a blank, rolling, carrying out heat treatment, turning and carrying out flaw detection, for example, designing the small allowance of the outer diameter and the inner diameter of the forging drawing, smelting the bar material in a specific specification by using a triple process, the method has the beneficial effects that the rolling stability is improved, the grain structure is refined, raw materials are saved, the production efficiency is doubled, the flaw detection requirement is met, and the method is suitable for manufacturing related parts in the aerospace field and has wide application prospects and important popularization value.

The invention discloses a special-shaped structure heat-proof layer forming method, and belongs to the technical field of composite material forming. The forming method comprises the following steps: preparing a first prepreg, cutting the first prepreg according to a first angle to obtain an inner-layer prepreg block, and cutting the first prepreg according to a second angle to obtain an outer-layer prepreg block; the inner-layer prepreg blocks are laid on the force bearing body layer by layer in a warp and weft staggered mode, the outer-layer prepreg blocks are laid on the inner-layer prepreg blocks layer by layer in a warp and weft staggered mode, and a large-area heat-proof layer laying layer set is obtained; preparing to obtain an edge heat-proof layer blank body; cutting off a thin-wall area on the edge heat-proof layer blank body; placing the edge heat-proof layer blank body after the thin-wall area is cut off on a mould pressing tool, laying a second prepreg in the area of the mould pressing tool corresponding to the cut-off part, and pre-pressing to obtain an edge heat-proof layer composite blank body; embedding the edge heat-proof layer composite blank body into the prepreg laying layer group to obtain a heat-proof layer blank body with a special-shaped structure; and performing curing treatment on the heat-proof layer blank with the special-shaped structure to obtain the heat-proof layer with the special-shaped structure.

The invention discloses a near-net forming method for a titanium alloy-based composite material powder component, belongs to the technical field of thin-wall complex component manufacturing, and particularly aims at near-net forming of a high-temperature titanium alloy-based composite material thin-wall complex component. Aiming at a complex thin-wall titanium alloy cabin section structural component with the service temperature reaching 700-750 DEG C, the high-temperature titanium alloy-based thin-wall complex component is obtained through a proper TiB2 powder and Ti60 powder matching and uniform powder mixing process and through a sheath design, a hot isostatic pressing process and a sheath removal process. Through a titanium alloy-based composite material hot isostatic pressing near-net forming technology, tissue-performance integrated regulation and control are achieved.

The invention discloses an ultrafast laser partition impact strengthening method and device for a thin-wall covered edge of a composite blade. According to the method, the surface of the thin-wall covered edge is strengthened by utilizing the characteristics of instantaneous high pressure of shock waves induced by ultrafast laser and accurate and controllable propagation depth, and meanwhile, according to the thickness characteristics of different areas of the covered edge, laser with different pulse widths is selected to carry out partitioned strengthening treatment, so that accurate regulation and control of a surface residual stress field are realized on the premise of inhibiting deformation; the problem of cooperative control of surface strengthening deformation and a stress field of the thin-wall edge covering structure is solved. According to the thickness characteristics of different areas of the edge covering structure, based on the principle that the shorter the laser pulse width is, the shallower the shock wave propagation depth is, the shallow the depth of a residual stress field influence layer is and the edge covering structure is not prone to deformation, a femtosecond / picosecond pulse width laser combined shock peening method is provided, and femtosecond laser shock is adopted in a thin-wall area; femtosecond laser or picosecond laser with relatively long pulse width is adopted for impact in a wall thickness area, and precise regulation and control of a surface stress field are achieved on the premise of restraining thin-wall wrapping edge deformation.

The invention provides a semi-aromatic polyamide material easy to process and form and a preparation method thereof. Comprising the following components in parts by weight: 40-78 parts of PA MXD6, 4-15 parts of long carbon chain nylon, 0.3-3 parts of polyethyleneimine, 20-60 parts of a reinforcing material, 0.2-5 parts of other auxiliaries and 0-50 parts of a filling material. The long carbon chain nylon with a specific length and the polyethyleneimine with a specific molecular weight are fully utilized to be matched, so that more shear sensitivity characteristics are obtained, and the problems of poor flowability of the aromatic ring nylon PA MXD6 material, lack of glue in thin-wall multi-cavity processing, tape casting, scorching, appearance fiber floating and the like are solved.

The invention relates to a polyester composition as well as a preparation method and application thereof, and the polyester composition comprises the following components in parts by weight: 40-60 parts of polyester resin, 5-20 parts of a brominated flame retardant, 0.5-5 parts of a synergistic flame retardant, 0.1-15 parts of polysulfone, 0.05-5 parts of talcum powder and 15-40 parts of a reinforcing material, the polyester composition does not contain PFAS substances. On the basis of retaining a brominated flame-retardant system, polysulfone and talcum powder are combined with the brominated flame-retardant system, so that the flame-retardant property of the material under a thin wall is obviously improved under the condition of not using PFAS substances, and the application prospect of the polyester material is expanded.