53 results about "Profilometer" patented technology

The invention provides a calibration process and a calibration block of a contourgraph, and relates to the technical field of contour parameter calibration, in the calibration process of the contourgraph, first scanning data is obtained by scanning a gauge block calibration part of the calibration block, second scanning data is obtained by scanning a standard ball calibration part of the calibration block, and the first scanning data and the second scanning data are obtained based on a physical model among a probe, a rotating shaft and a sensor. The measuring height difference between the first calibration plane and the second calibration plane, the straightness of the inclined plane, the measuring diameter of the fitting circle, the actual height difference of the gauge block calibration part and the actual diameter of the standard ball calibration part are calculated, and the position relation among the probe, the rotating shaft and the sensor is calculated at least with the minimum straightness of the inclined plane as the constraint. The calibration data not only have the height of the gauge block and the diameter of the standard ball, but also introduce the straightness of the inclined plane, and the calibration data is increased, so that the calibration precision is improved, and the nonlinear error caused by the difference between a mechanical structure and a theoretical model can be reduced.

The invention discloses a welding robot welding seam positioning method for shipyard part machining. The problems that an existing method is poor in deformation adaptation, weak in interference resistance and insufficient in positioning precision for shipyard large-size parts are solved. The method comprises the four steps that 1, a to-be-welded part is pre-fixed through a shipyard special tool, and a laser contourgraph, a millimeter wave radar and an industrial camera are combined to collect multi-source features; 2, obtaining a final welding seam positioning coordinate through multi-source feature layered extraction (a global reference feature layer builds a coordinate network, and a local welding seam feature layer improves a groove / gap parameter), global-local correlation matching (a rigid body transforms a mapping coordinate and calculates a deformation deviation) and dynamic deviation compensation (cubic spline interpolation fits a deformation curve and generates a three-dimensional compensation amount); 3, a positioning coordinate calibration robot TCP is imported, and a path is generated according to the welding seam type; and 4, verifying the precision in a no-load manner, and recalculating the compensation amount if the deviation exceeds 0.1 mm. The method is high in positioning precision, strong in interference resistance and suitable for complex working conditions of shipyards.

The application provides a 3D printer and a working method of a laser profiler. The 3D printer is provided with a calibration plate. Before a target object is scanned by the laser profiler, the print head and / or the print bed of the 3D printer can be moved, so that the laser profiler has different distances with the print bed. The camera and the laser emitter of the laser profiler controlled under different distances respectively shoot laser images with laser lines and calibration images without laser lines. Then, based on the calibration images and the laser images under different distances, the laser plane parameters of the laser profiler are calculated, so that the calibration of the laser profiler is realized in the 3D printer. When the calibration parameters of the laser profiler change due to vibration or other reasons, the laser profiler of the 3D printer can be recalibrated, so that the scanning precision of the laser profiler is ensured, and the precision of the 3D printer is ensured.

The invention belongs to the technical field of image processing, and particularly relates to a self-adaptive phased array C scanning imaging method for a surface thread curved surface, which sequentially comprises the following steps of: (1) establishing a curved surface coordinate; step (2), generating propagation prior; step (3), executing a step of cTFM imaging; and step (4), executing a step of RPCA decomposition imaging. According to the method, thread appearance point cloud is synchronously collected through a contourgraph and an encoder, a spiral expansion coordinate domain and a curved surface coordinate index table are established through double quaternion spiral expansion, and geometric continuous modeling of the rotating and feeding process is achieved; in the coordinate domain, a propagation prior lookup table containing refraction time intervals is generated based on a rapid propulsion method, and the refraction propagation path of sound waves between the wedge block and the detected body is accurately described.

The application relates to the field of semiconductor detection equipment and discloses a high-precision wafer profiler, which comprises a frame body mechanism, a wafer loading table mechanism, an optical detection mechanism, a temperature compensation mechanism and a central processing mechanism, wherein the frame body mechanism comprises a base, the wafer loading table mechanism is arranged above the base, the optical detection mechanism is arranged above the wafer loading table mechanism, the optical detection mechanism comprises a thickness detection assembly, a notch detection assembly and an edge detection assembly, the thickness detection assembly, the notch detection assembly and the edge detection assembly are integrated in one device, the device is highly integrated, carrying errors and repeated positioning errors are eliminated, the base is integrally cast from natural marble or high-strength cast iron, the measurement precision is stable, the XYZ theta four-degree-of-freedom motion module is combined with a fine adjustment mechanism of an optical lens, the accurate control and rapid focusing of the wafer position to be detected can be realized, and different specifications of wafers to be detected can be adapted.

The utility model discloses a handheld contourgraph measurement auxiliary tool which comprises a contourgraph body, a laser measurement assembly used for emitting laser and measuring the surface of an object is installed on the contourgraph body, and an installation rod is movably installed on the top of the contourgraph body. The mounting rod and the contourgraph body are rotationally arranged, a connecting rod is rotationally mounted at the top of the mounting rod, a handheld rod is rotationally mounted at the end, away from the mounting rod, of the connecting rod, the mounting rod, the connecting rod and the handheld rod form an auxiliary frame, and the auxiliary frame and the contourgraph body are disassembled and assembled. The contourgraph is used for improving the convenience of the contourgraph body, all-directional rotation of the contourgraph body is achieved by driving the contourgraph body to rotate on the X and Y faces, the Z and Y faces and the Z and X faces, and all-directional measurement and use of the auxiliary frame and the contourgraph body on the surface of an object can be facilitated.

The invention discloses an LBM model simulation system and method for monitoring and calibrating a denudation area based on in-situ surface topography, and belongs to the field of metal additive manufacturing. The system comprises a transparent box body and metal additive manufacturing equipment, wherein a movable line laser contourgraph is arranged in the box body. Based on the system, every time a layer is formed, the line laser contourgraph enters equipment to collect surface point cloud data and then exits, and the operation is repeated until printing is completed; after preprocessing the point cloud data, carrying out statistical analysis to obtain the length and width of a first layer denudation area and the maximum depth when the first layer denudation area is stable; and constructing and updating the denudation area in the LBM model based on the parameters, and completing calibration. According to the method, the problem that an existing LBM model lacks denudation area coupling capacity is solved, and simulation accuracy and forming quality are improved.

The application discloses a kind of ceramic material microstructure full field of view high flux cross-scale in-situ characterization method, comprising: ceramic and ceramic matrix composite sampling and cutting;Ceramic and ceramic matrix composite mechanical grinding and surface polishing;Ceramic sample test area positioning mark;Ceramic and ceramic matrix composite sample to be measured region surface three-dimensional topography height information high flux high-precision acquisition;Surface three-dimensional topography height information acquisition result post-processing and analysis, obtain a kind of ceramic and ceramic matrix composite microstructure full field of view high flux cross-scale in-situ characterization method.The application is based on ceramic material surface metallographic polishing, combined with white light interferometer test surface three-dimensional topography height information and acquisition information result filtering analysis and other post-processing, realize based on ceramic and ceramic matrix composite composition phase three-dimensional surface information difference analysis microstructure full field of view high flux cross-scale in-situ characterization.

The utility model provides an automatic optical film thickness scanning surveying instrument, and belongs to the technical field of optical spectrum instruments. The automatic optical film thickness scanning surveying instrument comprises a shell; the test platform is arranged above the shell, and the test platform is used for placing an object to be tested; the horizontal slide rail assembly is arranged in the shell and is used for driving the test platform to move horizontally; the supporting rod is arranged on the shell, a longitudinal sliding rail assembly is arranged on the supporting rod, a collimating lens barrel is arranged on the longitudinal sliding rail assembly, an optical fiber is installed in the collimating lens barrel, and the longitudinal sliding rail assembly is used for driving the collimating lens barrel to move longitudinally; wherein the horizontal slide rail assembly and the longitudinal slide rail assembly are used for adjusting the relative position between the test platform and the collimating lens barrel, so as to adjust the placing space of an object to be tested. According to the automatic optical film thickness scanning surveying instrument, the height of the collimating lens cone is adjusted according to the size of an object to be measured, and the optical film thickness scanning surveying instrument is convenient to use.

The invention belongs to the field of engineering application, and provides a water-proof scyphistoma adhesion-resistant wave-dissipating submerged dike which comprises a submerged dike adhesion-resistant optimization system, and the system comprises an adhesion extraction module which obtains the surface roughness, the effective adsorption area and the water flow speed through a contourgraph, a covering method and a buoy tracking method, constructs a model to calculate an initial adhesion value, and obtains the initial adhesion value; the correlation between the sub-parameters and the attachment density is analyzed when the risk is high; the structure optimization module determines an optimal inclination angle and a hollowing rate based on the negative correlation parameters, and calculates an attachment optimization value after adjustment to judge whether continuous optimization is needed or not; the coating laying module is used for identifying a high-adhesion-rate area according to the continuous optimization signal, determining an optimal coating laying area through an adhesion strength coefficient and verifying an effect; and the stability analysis module monitors for 30 days, calculates a structural stability coefficient and a final initial adhesion value, evaluates long-term stability through a comprehensive optimization value, and ensures that the submerged dike has wave dissipation and waterproof scyphistoma adhesion effects.

The application discloses a two-dimensional white light microscopic splicing interferometer measuring device and method, and belongs to the technical field of precise optical detection. The device comprises a base platform, vertical motion tables arranged on both sides of the base platform, a non-Schlieren interferometer and a white light profiler respectively carried by the vertical motion tables, an X-direction linear guide rail, and a large-scale rotary table assembly and a small-scale rotary table assembly arranged on the X-direction linear guide rail. The method uses the white light profiler and the non-Schlieren interferometer in cooperation, acquires the relative angle difference between sub-apertures in real time, adopts a dynamic angle compensation mechanism, and combines a specific splicing algorithm to realize high-precision fusion of surface shape data. The application effectively solves the angle error accumulation problem in sub-aperture splicing measurement of a small curvature radius curved mirror, realizes sub-nanometer level surface shape measurement precision, and is particularly suitable for high-precision detection of an X-ray curved mirror.

The present application relates to a kind of method and device for determining the matching relationship of gear macroscopic vibration and tooth surface micro-roughness.The method is as follows:(1) using three-dimensional profilometer, the profile height data of gear tooth surface is measured, with space frequency and power spectral density as horizontal and vertical coordinates, height data is plotted in double logarithmic graph, linear regression method is used for fitting, and the fractal parameter of tooth surface is calculated according to the slope and intercept of fitting function;(2) the vibration acceleration signal of gear transmission system and the signal of given speed and load are collected;Then, the collected signal is filtered and analyzed in time-frequency domain, and the acceleration amplitude corresponding to meshing frequency is extracted;(3) replace the gear with different micro-morphology, change the speed and load conditions, repeat the above operation, and obtain the quantitative matching relationship of tooth surface micro-morphology and macroscopic vibration response under different conditions.The present application realizes the quantitative matching of tooth surface micro-morphology characteristics and gear macroscopic vibration response.

1. Name of the product in this design: Laser profilometer test stand (desktop). 2. Purpose of this design: To measure the contour data of an object. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

The invention relates to the technical field of testing fixtures, and discloses a testing fixture for an arc-shaped automobile part, the testing fixture comprises a bottom plate, an arc-shaped part body, a contourgraph body and a mounting rack fixedly mounted on two sides of the top of the bottom plate, one side of the front surface of a vertical plate is provided with a detection assembly, and one side of the front surface of the mounting rack is provided with an auxiliary assembly. The detection assembly comprises a linear guide rail fixedly installed on the inner top face of the installation frame, the output end of the linear guide rail is fixedly connected with a moving seat, a moving plate is installed at the bottom of the moving seat in a liftable mode, an upper rotating rod is installed at the bottom of the moving plate in a transverse rotating mode, one end of the upper rotating rod is fixedly connected with a contact plate, and the outer side of the upper rotating rod is sleeved with a first torsional spring. Through the arrangement of the detection assembly, the unit block can rotate in a manner of adapting to the radian of the arc-shaped piece body, the contact plate adapts to the radian deflection of the unit block, and the constant distance detection between the measuring head and the arc-shaped piece body is maintained all the time, thereby facilitating the contour detection of arc-shaped piece bodies with different radians in a certain range, and improving the detection precision of the arc-shaped piece body.

The utility model relates to an auxiliary device for contourgraph measurement. The auxiliary device for contourgraph measurement comprises a base; the bearing assembly is rotationally connected to the base and used for containing products. The adjusting assembly is connected to the base; one end of the rotating part is rotatably connected to the side, close to the base, of the bearing assembly, the other end of the rotating part is movably connected to the adjusting assembly, and the rotating part rotates under the adjusting effect of the adjusting assembly and drives the bearing assembly to rotate so as to adjust the angle between the bearing assembly and the base. According to the auxiliary device for contourgraph measurement, the position of the rotating piece relative to the base is adjusted through the adjusting assembly, so that the angle between the base and the bearing assembly is adjusted, the position relation between a product placed on the bearing assembly and the contourgraph can be adjusted, and the contourgraph can obtain a larger measurement view angle during measurement; therefore, different measurement requirements are met, and the measurement effect and the measurement precision are improved.

A computer-implemented method for measuring the geometry of a guitar component is disclosed. A reference three-dimensional model representing a target geometry of the component is provided. The component is placed on a measurement station and scanned using a non-contact optical profilometer to obtain a point cloud. Points not corresponding to the component are filtered. Deviation values are computed by comparing the filtered point cloud with the reference model and are displayed in graphical form including colour-coded visualisation. Deviations affecting sound quality, playability or ergonomic characteristics are identified, and corrective operations are performed on the component based on the identified deviations. The method supports precise geometric evaluation and iterative correction during guitar manufacturing and setup.

The invention provides a gear honing machining process monitoring method and system.The method comprises the steps that the tooth surface roughness of a gear, the meshing torque of a honing wheel and the surface abrasion texture data of the honing wheel are collected through a line laser contourgraph, a dynamic torque sensor and an industrial camera respectively, and dimension reduction is conducted through time synchronization and principal component analysis; generating a fusion feature vector of the processing state; training a preset convolutional neural network by taking the fusion feature vector as an input and combining multi-machine-tool historical data and digital twin virtual trial cut data so as to output a corresponding anomaly level and an anomaly reason; the corresponding machining information is associated through the RDID of the gear, and the corresponding abnormal workpiece is positioned by combining the abnormal timestamp, so that the corresponding target honing wheel is locked; and corresponding adjustment machining parameters are matched in the process knowledge base according to the abnormal levels and the abnormal reasons, and the actual working state of the target honing wheel is correspondingly adjusted through the adjustment machining parameters. The production efficiency of the gear can be effectively improved.

The invention belongs to the technical field of spaceflight part surface quality detection, and particularly discloses a spaceflight scratch / tool mark depth rapid measuring device which comprises at least one comparison test block used for conducting visual comparison with the surface of a detected metal part, and the base material of the comparison test block is the same as the metal material of the detected metal part; a plurality of standard depth defects are sequentially processed on the comparison test block along the length direction, and identifiers for indicating the depth values of the standard depth defects are also arranged on the comparison test block. According to the method, standard scratches or steps with different depths are machined in advance, the defect depth can be judged only through visual comparison under the unified illumination and observation conditions during detection, and compared with a traditional optical microscopy, laser measurement or contact pin type contourgraph method, the detection efficiency is remarkably improved; the invention further discloses a measuring method, the reliability of judgment is improved, and the method has good adaptability to scratches and tool marks of different materials, different roughness and different types.

The application discloses a kind of motion vector calibration method and device, comprising: according to laser stripe image and profile data, the feature intersection set formed by laser intersection is obtained;According to the feature intersection set, the sequence pose relationship of line laser profilometer and auxiliary camera is obtained;According to the sequence pose relationship, the optimization objective function containing the to-be-calibrated parameter of mobile module is constructed, and the optimization objective function is minimized by nonlinear optimization algorithm, and the motion vector along the mobile module under line laser profilometer is obtained.Feature intersection set of laser is carried out by high-precision calibration plate and auxiliary camera, and the sequence pose relationship between measuring line laser profilometer and auxiliary camera is obtained according to the feature intersection set, and the motion vector of line laser profilometer is indirectly obtained by the obtained sequence pose relationship, the precision of the calibration method is high, the speed is fast, meets the accuracy requirement of actual industrial production, and is suitable for real-time detection in production process.

The utility model belongs to the profile gauge technical field, and disclose a kind of profile gauge for powder metallurgy mould detection, including workbench, the workbench top is fixed with lifting mechanism, the lifting mechanism bottom is equipped with profile gauge test body, the workbench top is equipped with locating plate, the locating plate top is detachably equipped with stop block, the locating plate top is slidably equipped with fixed plate.The utility model is cooperated through locating plate, fixed plate, clamping block and threaded rod, can realize the firm clamping of different size mould, avoid the displacement of mould in detection process, guarantee the accuracy of detection data, simultaneously, through the setting of L-shaped plate A, L-shaped plate B, inner slide and restraint band, can effectively support to inclined mould, expand the adaptation range of equipment to different state mould, further improve the reliability of detection, realize the effect of self-adapting positioning and fixing to different size mould.

This invention discloses a target relative pose measurement method based on a structural target. The steps include: 1) constructing a target pose measurement device based on a structural target; 2) docking and assembling the main module (7) and the sub-module (2); 3) using a 2D profilometer (3) to scan the structural target (8) and obtain the distance of each sequence point of segment A, segment B, and segment C on the structural target (8) relative to the 2D profilometer (3) and the width of each segment, and sending them to the calculation module (12); 4) obtaining the pose of the non-cooperative target area according to the pose relationship of the measured area, and realizing the docking assembly of the docking pin and the docking hole. This invention introduces fewer error sources and has a simple and efficient measurement method, reducing the complexity of pose calculation, shortening the assembly docking time, and improving the target's measured pose accuracy.

The invention provides a double-needle contourgraph probe calibration tool and calibration method, and the tool comprises a mounting seat which is provided with a second through hole in the front-back direction; the adjusting seat is arranged at the front end of the mounting seat in a sliding fit mode in the Z-axis direction, and a first through hole facing the second through hole penetrates through the adjusting seat; the micrometer caliper is vertically fixed on the mounting seat and can drive the adjusting seat to move up and down along the Z axis; the jacking ball assembly comprises two jacking bolts which are in threaded connection to the two sides of the adjusting base along the X axis and are coaxially arranged, and a jacking area is formed between the ends of the two jacking bolts; the ring gauge is vertically mounted on the mounting seat, a circular hole penetrates through the center of the ring gauge, a first reference part is formed, and the ring gauge can be detected by an imager; and the sphere is positioned in the jacking area, is used as a second reference part and can be detected by the imager. According to the double-needle contourgraph probe calibration tool and calibration method, the reliability of a detection result is improved, and reliable support is provided for high-precision and high-efficiency calibration of the double-needle contourgraph probe.

The invention discloses an indentation testing method and system suitable for a complex curved surface part, and relates to the technical field of material mechanical property tests.The method comprises the steps that an initial space coordinate system is confirmed; scanning the surface of the to-be-measured part through a three-dimensional contourgraph to obtain three-dimensional shape data and a curved surface equation, and calculating a tangent plane equation at a target measuring point on the to-be-measured part; determining an included angle between a plane intersection line between a tangent plane and the initial space coordinate system and a horizontal plane, and calculating and controlling the two telescopic rods to move according to the included angle and a preset interval between the telescopic rods; and calculating a central point coordinate of the spherical hinge moving assembly and a projection point coordinate of vertical projection on the plane where the positioning table is located so as to calculate a coordinate of the center of the positioning table, and calculating a coordinate difference between the projection point coordinate and the central coordinate so as to carry out indentation testing on the target measuring point. According to the invention, the indentation test can be rapidly, accurately and non-destructively carried out on the complex curved surface part.

The invention relates to the technical field of control, and discloses a CNC cutting control method and system.The method comprises the steps that a contourgraph is adopted for fixing a tool and conducting three-dimensional calibration on the tool, whether the tool is polished or not is judged, and a cutting tool is determined; and according to the material attribute of the to-be-cut lens cone and the rotating speed prediction model, determining a cutting prediction rotating speed, and according to the cutting friction coefficient, determining a rotating speed control strategy of the cutting prediction rotating speed. When the cutting friction coefficient is greater than a cutting friction coefficient threshold value, constructing a cutting environment influence chain based on the cutting area, and when a historical rotating speed control factor consistent with the rotating speed control factor does not exist in the historical data, determining a rotating speed control set based on the historical data, and determining a target rotating speed control factor according to the rotating speed control factor and the rotating speed adjustment coefficient. Good dynamic control is achieved, and the machining quality and stability of the integrated lens cone are guaranteed.

The invention discloses a multi-angle adjusting device for a contourgraph to detect ceramic products, which comprises a measuring platform, the height of one end of the measuring platform is fixed, and the height of the other end of the measuring platform is adjustable; the upper surface of the measuring platform is provided with at least two positioning blocks, and the rotation angles of the positioning blocks and the positions of the positioning blocks on the upper surface of the measuring platform are continuously adjustable. The invention further discloses a using method of the device. The beneficial effects of the scheme are that the inclination of the measuring platform can be continuously adjusted to adapt to any inclination angle of a to-be-measured workpiece; the platform mounting hole is a long hole and is adaptive to workpieces of any size; the platform mounting holes, the positioning block mounting round holes and the positioning block mounting long holes form infinite position and angle matching, and the special-shaped outer contours of the workpieces can be matched at will; disassembly, assembly and adjustment are convenient, the measurement efficiency is greatly improved, and the measurement precision is ensured.

The application discloses a non-contact pavement friction coefficient detection method, which comprises the following steps: obtaining a plurality of pavement point clouds by performing three-dimensional texture scanning on a pavement through a laser profilometer and a visible light camera; performing three-dimensional texture reconstruction on the pavement point clouds to obtain a space curve; extracting an index set of apparent texture features from the space curve; collecting friction data through a pavement friction test vehicle; and establishing a mapping relationship between the index set and the friction coefficient. The detection method realizes three-dimensional reconstruction of pavement micro-texture and macro-texture through two non-contact detection methods of a laser profilometer and a visible light camera, and then establishes a mapping relationship between a friction coefficient value collected by a traditional pavement friction test vehicle and the index set. The index set and the mapping relationship obtained through the method can be used to directly obtain the friction coefficient of the pavement.

This invention discloses a visual inspection device for the end face of a tablet pressing mold, comprising a cabinet and a workpiece. The cabinet houses a worktable with a clamping mechanism for limiting and clamping the workpiece. A first visual inspection mechanism is mounted on the worktable, and a second visual inspection mechanism is located on the upper part of the worktable near the clamping mechanism. Compared to existing technologies, this device, with its adjustable clamping mechanism and two visual inspection mechanisms, effectively improves inspection efficiency through their combined operation. The clamping mechanism rotates the workpiece under the drive of a stepper motor. The first visual inspection mechanism integrates an end face inspection camera and a laser profilometer, simultaneously measuring end face parameters and scanning surface defects. The second visual inspection mechanism is equipped with multiple axial inspection cameras, enabling precise modeling of the overall contour of the workpiece, thus avoiding efficiency losses caused by multiple clamping operations.

Embodiments of the present application provide a detection system, an opening and closing clamp, and a reverse arch detection method of a folding screen. The detection system is used to detect a folding screen of a folding electronic device, the folding electronic device being foldable along a folding axis, and the folding screen having an axis region corresponding to the position of the folding axis. The detection system comprises an opening and closing clamp and a profilometer. The opening and closing clamp comprises a base, a fixing assembly and a turnover mechanism arranged on the base. The fixing assembly is used to fix the folding electronic device on the turnover mechanism. The turnover mechanism has a rotating shaft and a bearing surface for bearing the folding electronic device, so that the turnover mechanism can drive the folding electronic device to fold or flatten along the folding axis, thereby adjusting the opening and closing angle of the folding electronic device. The profilometer is arranged towards the bearing surface of the turnover mechanism, and is used to obtain line profile data of the axis region of the folding screen, thereby dynamically detecting the state of the folding screen during folding or flattening of the folding electronic device.

The present application relates to the technical field of micro-lens array, and particularly relates to a kind of micro-lens array sag measurement methods.The micro-lens array includes a main lens and a plurality of micro-lens groups, and the plurality of micro-lens groups are uniformly distributed on the surface of the main lens from inside to outside, and the micro-lens group includes a plurality of micro-lenses arranged in a circumferential array;The present application measures the highest point of the micro-lens to be measured and the specific coordinates of the points where the two ends of the micro-lens to be measured intersect with the main lens by an optical profilometer, and measures a theoretical third intersection point on the design drawing;By combining theory with practice, the sag of the micro-lens is measured.The present application solves the problem that the existing detection method is difficult to achieve batch detection of micro-lens array.

1. Name of the product in this design: Integrated Roughness Profilometer. 2. Purpose of this design: To measure the surface roughness and surface profile shape parameters of a workpiece. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.