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317 results about "Tool marks" patented technology

Method and apparatus for alignment, comparison and identification of characteristic tool marks, including ballistic signatures

Systematic use of infrared imaging characterizes marks made on items and identifies the particular marking tool with better accuracy than use of visual imaging. Infrared imaging performed in total darkness eliminates shadows, glint, and other lighting variations and artifacts associated with visible imaging. Although normally used to obtain temperature measurements, details in IR imagery result from emissivity variations as well as thermal variations. Disturbing an item's surface texture creates an emissivity difference producing local changes in the infrared image. Identification is most accurate when IR images of unknown marks are compared to IR images of marks made by known tools. However, infrared analysis offers improvements even when only visual reference images are available. Comparing simultaneous infrared and visual images of an unknown item, such as bullet or shell casing, can detect illumination-induced artifacts in the visual image prior to searching the visual database, thereby reducing potential erroneous matches. Computer numerically controlled positioning of the toolmark relative to imaging sensors which use fixed focus optics with shallow depth of focus, varying focus distance and orientation systematically to construct a sequence of images, maximizes reliability of resulting images and their comparisons.
Owner:PROKOSKI FRANCINE J

Rough machining method of helical surface of hourglass worm

ActiveCN101700576ASolve the homogenization problem of grinding allowanceTurning machinesWhole bodyRadius of gyration
The invention discloses a rough machining method suitable for helical surfaces of various hourglass worms, belonging to a method for machining hourglass worms. The invention adopts the technical scheme that a hourglass worm 1, a turning tool 2, a turning tool marking line 3, a worm axial line 4, a turning tool revolving axial line 5 and a common perpendicular thereof 6 are comprised, wherein the worm axial line and the turning tool revolving axial line are vertically interlaced, perpendicular foots are respectively O and O', the turning tool marking line 3 passing through the point O', a leftcutter point N and a right cutter point M are arranged in a plane determined by the worm axial line 4 and the common perpendicular 6, wherein the revolving radius of the left cutter point N and the revolving radius of the right cutter point M are Rd. According to a principle of hourglass worm forming, an annular surface with the radius of Rd and a series of corresponding points on a left helical surface and a right helical surface at different axial section parts when the corresponding center distance of the same helical groove of the hourglass worm 1 is OO' are obtained. A cutter point between the cutter points N and the cutter point M is used for turning the part on the current annular surface of the same helical groove of the hourglass worm 1 between an engaging-in end and an engaging-out end, and turning whole body of the same helical groove along with the continuous reduction of the center distance OO'. The invention solves the problem of hourglass worm grinding allowance homogenization.
Owner:CHINA AGRI UNIV

Machining technology of turbine blade with water corrosion prevention achieved by means of laser cladding

ActiveCN103659201AGuarantee the requirements of machining dimensional accuracyGuarantee cladding qualityStellite alloyDistressing
The invention provides a machining technology of a turbine blade with water corrosion prevention achieved by means of laser cladding. According to the machining technology of the turbine blade, the machining precision of the blade can be guaranteed, the fusion cladding amount is small, and tool loss is reasonable. The machining technology of the turbine blade with the water corrosion prevention achieved by means of laser cladding comprises the steps of (1) blank manufacturing; (2) forming through die forging; (3) heat treatment; (4) rough milling of the molded surface of a blank and milling of a laser cladding groove, wherein a certain redundant amount of a forge piece is removed through milling, and the laser cladding groove is machined until the laser cladding groove is within a certain tolerance range; (5) laser cladding of stellite in the laser cladding groove; (6) correction of a blade by means of a pressing machine after laser cladding; (7) radiographic and penetration inspection of a laser cladding area; (8) repairing welding of an unqualified portion, in the laser cladding area, of the blade through argon arc welding; (9) distressing and heat treatment; (10) comprehensive milling, wherein the blade is machined until the blade is within the tolerance range; (11) polishing, wherein machining tool marks on the surface of the blade are removed through polishing; (12) shot blasting of the surface of the blade.
Owner:WUXI TURBINE BLADE

Full-screen browsing method and device for picture in web page

The invention discloses a full-screen browsing method and device for a picture in a web page. The method comprises the following steps of: opening a tag of a current web page in a sub-process of the web page, and obtaining position and picture information on picture elements in the web page; when a selection inputting event for the current picture elements is monitored in the sub-process of the current web page, sending the position and picture information on the current picture elements to a host process of a browser; according to the position information on the current picture elements, creating and displaying a picture full-screen display tool mark at a specified position by the host process of the browser; and receiving a trigger on the picture full-screen display tool mark from a user, creating a full-screen display window in the host process, and loading the picture information on the current picture elements into the full-screen display window. According to the method and the device, a mechanism for the full-screen browsing of picture elements in one or more webpage tags is established in the host process of the browser, so that the problem of browser failure caused when picture full-screen browsing is executed in the browser is solved.
Owner:BEIJING QIHOO TECH CO LTD

Surface treatment method of 3C product aluminum alloy outer parts and application

The invention provides a surface treatment method of 3C product aluminum alloy outer parts. The method comprises following steps in sequence: an aluminum alloy outer part is subjected to surface mechanical pretreatment, machining tool marks and burrs are removed, and a flat surface is obtained; degreasing is performed to remove greasy dirt on the surface; alkali washing is performed to remove a natural oxidation film on the surface, and an activated aluminum matrix is exposed; acid washing is performed to remove dirty ash on the surface; chemical polishing is performed, and a bright and smoothsurface is obtained; anodic oxidation is performed, and an oxidation film with micropores is formed on the surface; colorizing is performed, and a dyeing agent is deposited to enter the micropores inthe oxidation film; and finally, hole sealing is performed, and the micropores in the oxidation film are sealed. With the adoption of the method for surface treatment, the oxidation film is transparent and bright, the pores in the film are small and dense, the film thickness is uniform, various gorgeous colors can be obtained after coloring and hole sealing, and the aluminum alloy outer part hasexcellent attractive decorative effect and excellent wear resistance and corrosion resistance. The invention further provides an application of the surface treatment method to the 3C product aluminumalloy outer parts such as a smartphone and a tablet computer.
Owner:GUANGDONG INST OF MATERIALS & PROCESSING

Processing method of carved wood

The invention provides a processing method of carved wood, which belongs to the technical field of wood carving. According to the technical scheme, the processing method comprises the following steps: drawing a creative draft, and drawing and amplifying an outline onto a timber by utilizing an inked line; chiseling a rough blank: gradually chiseling the rough blank layer by layer from top to bottom, front to rear, surface to inside and shallow to deep, and gradually forming an outer profile and an inner profile of a piece of work; eliminating tool marks and chiseling residues in the rough blank by utilizing a fine carving and thin knife method; polishing the carved wood firstly by utilizing a piece of rough abrasive paper and then utilizing a piece of fine abrasive paper along the fiber direction of the wood; and coloring the carved wood by utilizing pigments and water in a ratio of 30:1, and scrubbing the carved wood after 12 hours later until the uniform gloss and smooth hand feeling are achieved. An ideal personal cutting way can be achieved only by mastering the skill and continuously accumulating the experience, and the artistic language reflected by wood grains-carving marks, smoothness-roughness, concave surfaces-convex surfaces, arrangement by circular knives, cutting by flat cutters, and the like can be achieved and cannot be shown by carving other materials.
Owner:吴晓琴

Cutting and forming device for battery pole piece with multiple coating tapes

The invention provides a cutting and forming device for a battery pole piece with multiple coating tapes. The cutting and forming device for the battery pole piece with the multiple coating tapes comprises an emptying mechanism, a cutting mechanism, a roll-forming mechanism and a receiving mechanism arranged sequentially, wherein the cutting mechanism comprises a first laser die cutting assembly,a second laser die cutting assembly, a feed roller assembly and a discharge roller assembly; the first laser die cutting assembly is located on one side, close to the emptying mechanism, of the secondlaser die cutting assembly; the output end of the first laser die cutting module directly faces the feed roller assembly; the output end of the second laser die cutting module directly faces the discharge roller assembly; and the roll-forming mechanism comprises two press rollers arranged oppositely. According to the cutting and forming device for the battery pole piece with the multiple coatingtapes provided by the invention, excessive tension release occurred on the coating tapes can be avoided, so that the density of the coating tapes is effectively improved; all slitting actions are omitted, and cutting and roll-forming are integrated into a whole, so that the production efficiency can be effectively improved, and the input cost can be reduced; and through the two groups of laser diecutting assemblies, the distance between die cutting tool marks can be effectively shortened, so that the materials can be effectively saved.
Owner:广东海中新能源设备股份有限公司

Mechanical finishing non-allowance process for removing tool marks of molded surface of blade body

Provided is a mechanical finishing non-allowance process for removing tool marks of the molded surface of a blade body. The finishing process, equipment, a clamp and machining parameters are optimized so that a finishing machining target can be achieved. The finishing process comprises the steps that coarse finishing machining and fine finishing machining are respectively conducted on the molded surface of the blade body, so that the tool marks on the molded surface and the radius R position of the front edge and the rear edge are removed respectively, and requirements for roughness are met. The selection of the equipment comprises the step that a spiral-flow type finishing machining device is selected. The design of the clamp comprises the step that the angle between a blade and the grinding material movement is 30 degrees through the clamp. The machining parameters include the rotating speed of a main shaft being 10-120rpm and the rotating speed of a roller being 10-50rpm. The mechanical finishing non-allowance process for removing the tool marks of the molded surface of the blade body has the advantage that machining quality is improved. The profile tolerance of the molded surface meets the requirement for the toughness degree of Ra0.4. The switch-over R of the front edge and the rear edge achieves the aim that the radius R of the front edge and the rear edge of the blade on which finishing machining is conducted keeps the circular degree state after numerical control milling is carried out. Distribution of pressure stress on the surface is more even than that of a manual finishing process.
Owner:SHENYANG LIMING AERO-ENGINE GROUP CORPORATION

Numerical control spherical lathe

The invention discloses a numerical control spherical lathe, which comprises a base. A servo motor is arranged in the base, a spindle assembly is arranged on the base and connected with the servo motor through a speed reducing transmission device, and a workpiece clamping unit is installed at the front end of the spindle assembly. A Z-axle circle center locating unit is arranged on the base, a Y-axle rotating unit is installed on the Z-axle circle center locating unit, an X-axle radius feeding unit is installed on the Y-axle rotating unit, and the upper portion of the radius feeding unit is provided with a knife rest and a knife rest converting unit. The numerical control spherical lathe adopts a multiple-axle lathe system with a single coordinate system controlled by five shafts and the normal cutting principle. A cutting tool always aligns at the circle center like the fact that a compass describes a circle around a point, and accordingly the roundness is very high. When the numerical control spherical lathe performs processing, a cutting edge cutting error and an interpolation error which are caused by quadrant left-and-right cutting when an ordinary numerical control lathe cuts a round sphere do not occur, wherein the errors include tool marks of program translation and pause in quadrant passing process.
Owner:南京肯迈得机床制造有限公司
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