30 results about "Diamond turning" patented technology

The invention provides a collaborative tool servo diamond turning method and system based on track pre-filtering, and the method comprises the steps: S1, integrating a fast tool shaft to a machine tool shaft in the cutting depth direction, and constructing a master-slave collaborative tool servo system; wherein the machine tool shaft serves as a main servo shaft of the master-slave cooperative tool servo system, and a low-frequency tool path obtained after reference tool path pre-filtering is executed; the fast cutter shaft is used as a slave servo shaft of the master-slave collaborative cutter servo system, and the deviation between the actual displacement of the master servo shaft and the reference cutter path is compensated in real time; s2, implementing a collaborative tool servo machining process based on a master-slave collaborative tool servo system; and S3, after machining is completed, surface contour data are obtained, and quantitative evaluation is conducted on a machining result through surface shape errors and surface roughness indexes.

The invention relates to the field of ultra-precision polishing, in particular to an in-situ laser polishing system for a diamond turning metal surface. Comprising a turning tool servo shaft, a laser polishing assembly and a controller, a laser emitting part is arranged on the turning tool servo shaft, and the controller is used for controlling polishing laser emitted by the laser emitting part to move and scan on the surface of a turned workpiece in the direction perpendicular to the turning path. The distance between two adjacent scanning paths is smaller than the diameter of the Gaussian beam. According to the invention, the laser polishing system is integrated on the ultra-precision machine tool, so that the turning and polishing processes of the workpiece can be completed under the same clamping, and secondary clamping and repositioning, introduced scratches and clamping errors are avoided. And meanwhile, the surface of the workpiece is heated through the out-of-focus light spots, so that the material in the area is in a flowable state after being heated, and under the action of gravity or self-tension, the material at the high position moves to the low position, so that the self-leveling effect is achieved, and the surface roughness is reduced.

The invention discloses a polycrystalline tungsten cutting surface performance regulation and control method which comprises the following steps: selecting high-purity tungsten powder, carrying out heat treatment after high-temperature sintering, removing an oxidation film and a rough layer to obtain a polycrystalline tungsten blank, selecting the polycrystalline tungsten blank with qualified density, carrying out high-temperature heating, carrying out forging, refining the average grain size of polycrystalline tungsten, and after the forging is finished, carrying out heat treatment on the polycrystalline tungsten powder to obtain the polycrystalline tungsten cutting surface performance. And the fine-grain tungsten sample is subjected to annealing treatment, the fine-grain tungsten sample is polished, and the fine-grain tungsten sample obtained after treatment is subjected to single-point diamond turning. According to the fine-grain tungsten treated through the high-temperature forging process, microcrack propagation can be effectively restrained, surface defects are reduced, then the surface integrity of a turned sample is improved, a continuous ultra-fine grain surface layer can be generated on the surface, and the irradiation resistance and corrosion resistance of the fine-grain tungsten are improved.

The invention discloses a precise rotary table motion error measuring device based on a three-point method error separation technology, and the device comprises a marble table surface which is used for supporting and installing a precise rotary table to be measured; the leveling tool is connected to the table top of the precise rotary table; the standard flat plate cushion block is mounted on the leveling tool; the standard flat plate is arranged on the standard flat plate cushion block; the mounting frame is connected to the marble table top, and axial error measurement or inclination error cross validation measurement of the precise rotary table is achieved by mounting different numbers of displacement sensors. According to the method, the detection mode that machining cannot be conducted in China and only depends on imported high-precision detection rods is abandoned, and a standard flat plate obtained through surface grinding machine grinding or single-point diamond turning machining is replaced to serve as a standard workpiece. And the standard flat plate can be accurately leveled by matching with a leveling tool, so that the mounting inclination of the standard workpiece is reduced. The device has the advantages of being high in measurement accuracy, flexible to operate, easy to adjust, good in adaptability and low in cost.

1. Name of the designed product: plate (crystal flower plate). 2. Use of the designed product: used for containing food. 3. Design points of the designed product: in the pattern. 4. Picture or photo that best shows the design points: design 1 perspective view. 5. Design 1 is designated as the basic design.

The application relates to the technical field of single-point diamond turning, in particular to a method for estimating the influence of a single-point diamond turning tool mark diffraction on image quality, which comprises the following steps: designing an optical system and modeling a tool mark diffraction surface as a phase diffraction annular grating in the optical system; calculating an amplitude spread function of light rays after the light rays pass through the optical system and reach an image plane; respectively calculating diffraction efficiencies of different diffraction orders under the amplitude spread function of the same wavelength, and superimposing the amplitude spread functions after the amplitude spread functions are normalized to the corresponding diffraction efficiencies; calculating a complex color intensity spread function based on the amplitude spread functions of different wavelengths; and obtaining a modulation transfer function after image quality is reduced based on the complex color intensity spread function, so that a design index can be effectively comprehensively evaluated, processing test cost is reduced, and a production cycle is shortened.

The utility model relates to the technical field of grinding devices, in particular to an automatic grinding device for a curved-edge diamond turning tool, which comprises a rack and a grinding mechanism arranged on the rack, the grinding mechanism comprises a tool setting mechanism, a main shaft mechanism, a CCD (Charge Coupled Device) detection mechanism and a powder coating mechanism, the turning tool is driven to move in the Y-axis direction through the Y-axis moving assembly; the main shaft mechanism is used for driving a grinding wheel on the main shaft mechanism to grind a turning tool, the grinding wheel is moved through X-axis and Z-axis coordinates, and then it is guaranteed that curve machining can be conducted on the turning tool in combination with Y-axis coordinates of the tool setting mechanism. The CCD detection mechanism and the tool setting mechanism move synchronously and are used for shooting and detecting the tool setting and machining process of the turning tool. The powder coating mechanism is used for coating the grinding wheel with powder, and normal operation of grinding work is guaranteed.

The invention relates to a tool holder device, a method and a tool for operating an object, in particular for single point diamond turning (SPDT). A tool holder apparatus generally includes: a tool holder including: a base; a tool support extending from the base; a seat for a tool, the seat being provided on the tool support wherein the tool is positionable in the seat in use; a sensor device configured, in use, to generate an electrical measurement signal representing at least or associated with at least a force applied to the tool; and a piezoelectric actuator arrangement comprising at least one piezoelectric actuator, the at least one piezoelectric actuator being operably connected to the tool support, the at least one piezoelectric actuator is configured to, in use, displace the tool support, or at least a portion thereof, in response to receiving a suitable electrical control signal, thereby maintaining, in use, a desired force applied to the tool.

The invention discloses a fused quartz lens manufacturing method based on a partially degreased silicon nano composite material. The fused quartz lens manufacturing method mainly comprises three steps of preparation of the partially degreased silicon nano composite material, single-point diamond turning and high-temperature degreasing and sintering. The preparation method comprises the following steps: firstly, dispersing nano silicon dioxide powder into an organic solvent to prepare silicon dioxide slurry, obtaining a partially degreased silicon nano composite material through photocuring and partial degreasing, then forming a high-precision complex structure by using single-point diamond turning, and finally performing high-temperature degreasing and sintering in a muffle furnace to obtain the transparent and compact fused quartz lens. According to the method, through partial degreasing, stress existing in the material during light curing is released, deformation in the high-temperature degreasing and sintering process is greatly reduced, meanwhile, the excellent cutting machining performance of the material is reserved, and high-precision manufacturing of the complex fused quartz optical element is achieved.

The invention discloses a method for determining a path of a diamond turning tool with a large-gradient rotational symmetry surface shape. The method comprises the following steps of: firstly, dividing a curvilinear equation of a processing object into a series of discrete data points according to an equal arc length method or an equal interval method and the like; then, calculating unit normal vectors corresponding to the discrete points according to a curvilinear equation; and then, mapping the measured surface shape error to a curvilinear equation of a processed object according to a unit normal vector of a corresponding point, and finally, adding cutter radius compensation on a cutter path according to the unit normal vector of the corresponding point, and outputting a processing program according to a machine tool numerical control program format. According to the method for determining the path of the diamond turning tool, the number of times of surface shape compensation of single-point diamond turning can be reduced, the convergence speed is increased, particularly for a large-gradient surface shape, the surface shape convergence speed is higher than that of a conventional diamond turning tool, and the machining precision and the machining efficiency of the whole process are improved on the whole.

The application discloses a kind of diamond turning device of large aperture chalcogenide glass aspherical lens and its use method, including pedestal assembly, along diamond processing flow direction, the pedestal assembly is sequentially equipped with feeding unit, turning unit, conveying unit, discharging unit;The feeding unit is used to transport and pick up and transfer to turning unit, including first conveyor belt, stock bin and the gripper material taking assembly that can be translated and lifted, first conveyor belt is transported to stock bin after blank, gripper material taking assembly takes material and moves to turning unit.Such as an integrated pedestal assembly integrates feeding, turning, conveying, discharging four units, orderly arrangement along workpiece processing flow, work position is closely linked, realize blank feeding, precision turning, material conveying, finished product storage Full-automatic closed-loop operation, greatly reduce manual intervention, improve processing efficiency and production stability.

The invention relates to the technical field of millimeter wave communication, in particular to a V / W wave band low-loss metal waveguide and a preparation method thereof. According to the preparation method provided by the invention, metal additive manufacturing, inner wall conductive metal deposition, ultra-smooth inner surface polishing and external single-point diamond turning technologies are combined, so that the waveguide manufactured by a composite process chain is high in yield; comprising an aluminum-magnesium (zirconium) alloy waveguide structure manufactured through laser beam melting additive manufacturing, a copper (silver) inner wall coating deposited through a chemical reduction plating technology, an inner wall surface with the roughness lower than 50 nm Ra through abrasive flow machining, and a self-alignment flange with the flatness lower than 0.1 micron and the butt joint surface roughness lower than 20 nm Ra through ultra-precision machining. And the electrical performance, the thermal interface consistency and the assembly precision are improved. According to the preparation method, the problems of high price-mode coupling, uncontrollable inner wall roughness and the like caused by high insertion loss and large structure assembly error of the existing waveguide structure in high-frequency application are solved.

The invention discloses a method for rapidly manufacturing a small-caliber silicon carbide reflector substrate, which comprises the following steps of: determining an optical surface type of a target reflector according to a design drawing of the target reflector, processing a concave surface type consistent with the surface type of the reflector on the surface of a die by adopting a single-point diamond turning technology, and forming the small-caliber silicon carbide reflector substrate by utilizing a glass die forming technology. Carrying out hot press molding on a thermoplastic resin material in the mold to obtain a convex surface type polishing head complementary to the surface type of the reflecting mirror, attaching the polishing head to a silicon carbide reflecting mirror blank, injecting a polishing solution, keeping the reflecting mirror blank fixed, driving the polishing head to rotate at a high speed, and carrying out surface contact type polishing on the surface of the reflecting mirror blank to obtain the silicon carbide reflecting mirror. And the surface quality of the polished reflector blank is detected, if the surface quality does not reach the standard, the mold is reprocessed according to the measured surface type, the method is repeated until the processing requirement is met, the special polishing heads complementary with the reflector surface type are prepared in batches through die forming, and the problem that the efficiency is low due to the fact that the sizes of the polishing heads are limited for the small-caliber reflectors is solved.

The invention discloses a Fresnel lens photoetching processing method which comprises the following steps: step A, designing a three-dimensional model of a Fresnel lens according to design requirements of the Fresnel lens; b, plane projection is carried out according to the three-dimensional model of the Fresnel lens, and a projection mapping relation is obtained; the projection mapping relation comprises coordinate positions in a projection plane and height values corresponding to the coordinate positions; step C, according to the height value corresponding to each coordinate position, determining the depth of the structure needing to be photoetched at each coordinate position; step D, converting to form a photoetching parameter file according to the depth of the structure needing to be photoetched at each coordinate position; and step E, carrying out photoetching according to the photoetching file information, and developing the photoetching offset plate subjected to photoetching to obtain the photoetching offset plate with a Fresnel lens pattern. According to the method, the three-dimensional image of the Fresnel lens can be obtained in a photoetching mode, and an original precision diamond turning micromachining means can be replaced.

A method for turning free-form surfaces based on B-axis control of uniform tool wear includes: (1) preparation stage: setting tool parameters, surface quality requirements and effective cutting edge discretization model; (2) offline path planning stage: generating tool contact points based on Archimedes spiral, combining surface normal angle and virtual wear accumulation array, dynamically selecting the cutting edge with the least wear, calculating the corresponding B-axis rotation angle and updating the wear state; (3) online machining stage: performing tool center coordinate compensation, generating X, Z, C, B four-axis linkage NC code, driving the machine tool to complete the machining; This invention actively controls the B-axis posture, transforming tool wear from local concentration to uniform distribution across the entire cutting edge, significantly extending tool life, improving the machining accuracy and consistency of free-form surfaces, and is particularly suitable for single-point diamond turning of optical components such as off-axis parabolic surfaces.

The invention discloses an ultrasonic vibration assisted five-axis ultra-precise single-point diamond turning face gear method, which comprises the following steps of: 1, planning an initial cutter contact point path of an enveloping face gear tooth surface: carrying out inversion on tooth surface discrete points through an NURBS (Non-Uniform Rational B-Spline) algorithm, and determining node vectors in combination with a centripetal parameterization method, the Archimedes spiral is projected to an NURBS parameter space, and an initial cutter contact of an enveloping tooth surface is generated; step 2, determining a machining condition of the minimum residual height: calculating elliptical trajectories of a cutter in a cutting direction and a cutting depth direction according to ultrasonic vibration parameters, analyzing a coincidence condition of the cutter and an initial contact point of a workpiece, and optimizing a G code running speed of a machine tool to enable the number of spiral trajectories between adjacent cutter contacts to meet a time synchronization relationship; and thirdly, cutter contact point distribution is adjusted and controlled to achieve normal separation of the cutter and the workpiece, the initial cutter contact point path is adjusted through a golden section method, it is ensured that the cutting speed is smaller than the vibration speed of the cutter in the cutting direction, and periodic separation of the cutter and the workpiece is achieved.

According to the back thinning and polishing preparation method for the infrared focal plane array chip assembly, indium columns are evenly distributed between the lower surface of an indium antimonide chip and the upper surface of a circuit, and filling glue is poured between the lower surface of the indium antimonide chip and the upper surface of the circuit in a vacuum mode; the back thinning and polishing preparation method comprises the steps of inverted interconnection, epoxy glue filling and curing, quartz substrate bonding, single-point diamond turning, chemical mechanical polishing, cleaning and corrosion. According to the method, a single-point turning machining mode is adopted, so that damage and crack are not generated, pit-shaped point stress damage is not generated, the PV value is smaller than 1 micron, the machining process is controllable, a traditional downward pressurization grinding mode is changed, the difficulties of pressurization cracking and non-uniform thickness faced by module surface type warping are overcome, and the method can be widely applied to infrared focal plane array chips.

This invention discloses an ion beam processing method for visible light aluminum mirrors based on an improved shaping strategy, comprising the following steps: 1) correcting the surface shape error of the aluminum mirror using a single-point diamond turning process; 2) correcting the surface shape error of the aluminum mirror corrected by the single-point diamond turning process using a magnetorheological process; 3) obtaining the surface shape error matrix R of the aluminum mirror corrected by the magnetorheological process. mrf and the amount of material removed r during magnetorheological processing m Based on the amount of material removed r m Calculate the contamination layer removal residence time matrix T in the residence time matrix of ion beam processing. c According to the surface error matrix R mrf Calculate the matrix removal residence time matrix T in the residence time matrix of ion beam processing. s The aluminum reflector, after being corrected using magnetorheological technology, is processed using an ion beam process using the aforementioned residence time matrix. This invention improves the ion beam shaping strategy to further enhance surface accuracy.

The invention belongs to the technical field of ultra-high-temperature compression molding of quartz glass optical elements, and particularly provides an ultra-precise cutting machining method for the ultra-smooth surface of a glassy carbon compression mold and a position control-force control cooperative control ultra-high-temperature compression molding method. The ultra-smooth surface of the mold is obtained by machining high-elasticity and high-brittleness glassy carbon by utilizing an ultra-precision single-point diamond lathe in combination with a PCD (Polycrystalline Diamond) turning tool and a single crystal diamond turning tool, and the mold has nanoscale roughness, submicron surface shape precision and complex curved surface shapes such as an aspheric surface, a spherical surface or a micro-nano structure. When the glassy carbon ultra-smooth surface mold is used for conducting ultra-high-temperature compression molding on quartz glass, when the mold pressure increasing rate of the lower mold exceeds a preset threshold value, the mold pressing assembly controls the upper mold to reduce the moving rate, and when the mold pressure increasing rate of the lower mold is smaller than a set value, the mold pressing assembly controls the upper mold to increase the moving rate; and finally, ultrahigh-temperature compression molding of position control-force control cooperative control is achieved.

This invention relates to the field of advanced laser manufacturing and optical inspection, specifically to a method and system for monitoring the temperature field of a single-point diamond cutting region using laser in situ assistance. The method includes the following steps: S1, inducing plasma generation in the processing area using a pulsed laser and acquiring a spatiotemporal resolved image of the plasma luminescence region; S2, extracting morphological feature parameters and corresponding spectral intensity data from the spatiotemporal resolved image of the plasma luminescence region in S1; S3, inputting the morphological feature parameters from S2 into a pre-calibrated temperature mapping model to calculate the two-dimensional temperature distribution of the processing area; S4, confirming the location and temperature rise rate of abnormal temperature distribution areas based on the two-dimensional temperature distribution in S3, and generating real-time optimization commands for laser power and scanning path to achieve monitoring of the temperature field in the diamond cutting region.

A versatile space telescope for quantum key distribution and adapted for interfacing with a spacecraft and an instrument module. The telescope includes diamond turned aluminum mirrors at its entrance and exit, adjacent the spacecraft and instrument module, respectively.

The present application relates to a kind of large size optical mold fast low-cost manufacturing method, comprising the following steps: obtaining the machining number module of mold, grinding and polishing.The large size optical mold fast low-cost manufacturing method of the present application, by mechanical arm small grinding head, the optical mold with mold steel as base material is directly processed to the required surface shape precision and surface roughness, without surface nickel-phosphorus modification, single-point diamond turning, artificial grinding and polishing and other process links, simplify manufacturing process flow and improve manufacturing efficiency.Compared with the optical surface after nickel-phosphorus modification, the optical surface of mold steel base is more capable of resisting wear and tear and scratch, prolongs the service life of mold, and reduces manufacturing cost.

The application relates to a method for designing machining parameters and tool parameters of ultrasonic vibration assisted cutting of a single crystal silicon optical element, and belongs to the technical field of optical manufacturing. Single crystal silicon is a typical hard and brittle difficult-to-machine material, and it is difficult to machine a high-precision crack-free smooth complex curved surface on the single crystal silicon by using conventional ultraprecision manufacturing technology. Moreover, it is difficult to machine a large-aperture optical element due to the rapid wear of a diamond tool. In the application, the numerical values of crack projection length and maximum tolerance length at the critical undeformed chip thickness or the maximum undeformed chip thickness of the single crystal silicon material in ultrasonic vibration assisted diamond turning of the single crystal silicon are calculated and compared, whether a smooth crack-free surface can be obtained is evaluated, and the machining parameters and tool parameters suitable for being adopted when the smooth crack-free surface can be obtained are calculated and analyzed. The application has important value in improving the surface quality and machining efficiency of the single crystal silicon in ultrasonic vibration assisted diamond turning.

Systems and methods for a cost-effective, high-performance optical lens for head mounted displays (HMDs) or other applications. The lens assembly combines a thin lens with microfeatures on at least one transmission surface, and a thicker lens with a curved surface, allowing for plano-convex or bi-convex configurations. Both lenses have mounting areas with complementary microfeatures on their peripheries, facilitating their coupling and self-alignment within low tolerances. These microfeatures, including the mounting ones, can be generated using a high-precision process like diamond turning, thereby ensuring precision in alignment and function.

This invention relates to a method for confirming the virtual center position of an ultra-precision machine tool based on straight groove cutting. The workpiece and a diamond turning tool are fixed on the C-axis and B-axis of the ultra-precision machine tool, respectively. The workpiece is turned to eliminate Z-axis tool setting errors. After tool setting is completed using a tool setter, the initial virtual center position is recorded, and the diamond turning tool is controlled to plan the first straight groove. The virtual center function is activated, and the B-axis is rotated by an angle α, controlling the diamond turning tool to plan the second straight groove. Then, the B-axis rotation angle is adjusted to -2α, controlling the diamond turning tool to plan the third straight groove. The depth of the three straight grooves is measured along the Z-axis and recorded. The angle θ between the initial virtual center, the actual virtual center, and the B-axis rotation center, as well as the distance L' from the actual virtual center to the B-axis rotation center, are calculated to confirm the position of the actual virtual center. When machining complex feature structures, this invention can greatly improve the efficiency of toolpath programming, effectively reduce machining path deviations, and improve the surface quality of ultra-precision machining.

The present invention relates to the field of ultra-precision polishing, and particularly to an in-situ laser polishing system for diamond turning of metal surfaces. It includes a turning tool servo axis, a laser polishing component and a controller. The laser emitting part is arranged on the turning tool servo axis. The controller is used to control the polishing laser emitted by the laser emitting part to move and scan on the surface of the turned workpiece in a direction perpendicular to the turning path. The spacing between two adjacent scanning paths is less than the diameter of the Gaussian beam. In the present invention, by integrating the laser polishing system into an ultra-precision machine tool, the workpiece can complete the turning and polishing processes under the same clamping, avoiding secondary clamping and repositioning, as well as the introduced scratches and clamping errors. At the same time, the defocused light spot is used to heat the surface of the workpiece, so that the material in this area is in a flowable state after being heated. Under the action of gravity or its own tension, the material at the high place moves to the low place, realizing a self-leveling effect to reduce the surface roughness.

The single-point diamond turning device comprises a bottom plate, a circumferential sealing component installed on the bottom plate and the lens arranged on the circumferential sealing component, a plurality of countersunk threaded holes are formed in the bottom plate in an array mode, a vacuum connector is formed in the center position of the bottom plate, and the vacuum connector is connected with the circumferential sealing component. A piston support is slidably connected into a countersunk threaded hole in the circumferential sealing component, the top of the piston support abuts against the lower surface of the lens, and the upper surface of a piston of the piston support, the lower surface of the lens, the inner wall of the circumferential sealing component and the upper surface of the bottom plate jointly define a closed cavity. The device is suitable for supporting the large-diameter-thickness-ratio curved surface contour lens, it can be guaranteed that all positions of the lower surface of the lens are effectively supported in the machining process on the premise that an active adjusting device and operation are not needed, the mirror surface deformation area is small and the deformation amplitude is small when the lens is machined, and the surface shape precision of the machined mirror surface is further guaranteed.

The invention relates to the technical field of on-line measurement, in particular to an on-line measurement method for a microstructure feature part, which comprises the following steps: mounting a microscope lens on a tool table of a machine tool, controlling the X-axis and Z-axis movement of the machine tool, observing and positioning the microscopic features of the part, and recording the initial values of the X-axis and Z-axis coordinates of the machine tool; disassembling the microscope lens, then installing a spectrum confocal measuring head, and determining adjustment values of the X-axis and Z-axis coordinates of the machine tool according to the initial values of the X-axis and Z-axis coordinates of the machine tool and a predetermined offset value; the adjustment values of the X-axis and Z-axis coordinates of the machine tool are input into a numerical control system of the machine tool, and the spectrum confocal measuring head is positioned at the microscopic characteristics of the part. According to the method, online measurement of the microstructure features after the ultraprecise single-point diamond lathe machines the microstructure feature parts can be realized, the practicability of the lathe is improved, and the measurement investment cost is saved.

The utility model discloses a diamond turning tool for turning a long inner hole, which belongs to the field of metal processing and comprises a tool rest sleeve, the top of the tool rest sleeve extends upwards to form a plurality of skirts, a gap is reserved between every two adjacent skirts, threads are arranged on the outer walls of the skirts, and an adjusting groove is arranged at the top of the tool rest sleeve. The nut locking rings are arranged on the outer walls of the skirt edges in a sleeving manner; every two adjacent connecting pieces can be connected in a spliced mode, and one end of one connecting piece is inserted into the corresponding adjusting groove. According to the diamond turning tool for turning the long inner hole, through the design that the connecting pieces can be spliced at will and the relative positions of the connecting pieces and the tool rest sleeve can be adjusted, the length of the turning tool can be adjusted before turning, the applicability of the turning tool is improved, various turning tools with different lengths do not need to be prefabricated, cost is saved, and the machining efficiency is improved. Meanwhile, due to the replaceable design of the tool bit, when the tool bit is abraded or has different turning requirements, only the whole tool bit can be replaced, so that the use cost is increased, and the machining efficiency is reduced.