32results about How to "Reduce repetitive positioning errors" patented technology

The invention discloses a method and device for achieving full-profile grinding of blades with tenons through a cylindrical coordinate three-axis linkage machine tool. The device is characterized in that the blades are mounted on a rotating shaft of a numerical control machine tool in a manner that the tenons are arranged upwards, and the three-axis linkage machine tool is formed by other two linear shafts of the numerical control machine tool and the rotating shaft; the three-axis linkage machine tool is used for driving a disc grinding wheel to carry out full-profile grinding machining on the blades; a rotating shaft of the grinding wheel is not parallel to or perpendicular to a rotating working table of the machine tool or the axis of the rotating shaft, the phenomenon that the length of the grinding wheel is shortened is avoided, and the long blades are machined; according to the method, only through three motion axes, the tenons and profiles of the blades can be comprehensively machined; the machine tool manufactured through the method has the coat far below a five-axis linkage numerical control machine tool, and a square matrix structure is formed through a plurality of spindles and the rotating shaft, so that multiple blade parts can be machined on the same machine tool, and the production efficiency of the machine tool can be obviously improved.

The invention discloses a numerical control processing machine tool and processing method special for a double-power unit propeller of a large ship. The machine tool comprises an upper and a lower power unit system; the upper power unit system comprises an upper base, a mobile column, a lead screw nut mechanism, a motor, a guiding rail and an A / C direct-drive double pendulum power unit; the lower power unit system comprises a lower base, a lead screw nut mechanism, a motor, a guiding rail, a B2 axle assembly and a second A / C direct-drive double pendulum power milling unit. The processing method comprises the following steps that the upper surface of the propeller is cut and processed firstly, and then the lower surface is cut and processed, the operation is repeated until all impellers are processed; alternatively, the upper surface of the propeller can be cut and processed until the upper surfaces of all impellers are processed, and then the lower surface is cut and processed until the lower surfaces of all impellers are processed; the processing of the whole propeller curved surfaces such as impeller pressure surface, impeller suction surface, and propeller hub and the like is completed in one time of assembly, so that the troubles of turning over and reassembling of the large propeller can be saved, thus processing efficiency is improved and repositioning error is reduced.

The invention relates to the technical field of mechanical processing technology equipment, in particular to a double-sided finishing fixture for a large thin-walled flange and a flange processing technology, including an upper permanent magnetic disk, a lower permanent magnetic disk, a non-magnetically conductive intermediate connecting disk, and several guides. Rotary positioning claws made of magnetic materials, the upper permanent disk and the lower permanent disk are fixed into one body through the intermediate connection disk, and are located between the lower end surface of the upper permanent disk, the upper end surface of the lower permanent disk, and the outer circle of the intermediate connection disk. A space for an annular groove is formed; the rotary positioning claw is provided with a rotating shaft, an upper positioning claw, and a lower positioning claw, and the rotary positioning claw is installed on the upper permanent magnetic disk and the lower positioning claw of the space part of the annular groove through the rotating shaft. Between the permanent disks, the upper positioning claw and the lower positioning claw are arranged in opposite directions around the center of the rotating shaft. Adopting the present invention can realize fast switching between the positioning of the lower end face of the flange and the positioning of the upper end face of the flange without hoisting and turning over the flange, and has high processing efficiency and good processing precision.

A vacuum chamber optical element lifting and positioning device is characterized in that the vacuum chamber optical element lifting and positioning device comprises a frame body, a motor, a tray, a lead screw and a guide mechanism; the frame body comprises at least two stand plates and a top plate arranged on the stand plates; the power output end of the motor is connected with a worm; the tray comprises at least two longitudinal beams and a beam arranged between the longitudinal beams; each longitudinal beam is provided with a first positioning ball with the upward end face; the beam is provided with a second positioning ball with the upward end face as well; in addition, the two first positioning balls and the second positioning ball are not located on a straight line and can repeatedly position optical elements; the lead screw is vertically arranged on the beam of the tray; a rotating nut in rotation fit with the lead screw is arranged at the upper end of the lead screw; and worm teeth in rotation fit with the worm are arranged on the outer wall of the rotating nut. Compared with the prior art, the vacuum chamber optical element lifting and positioning device has the beneficial effects that the overall structure is simple, use is convenient, control is accurate, and the lifting distance can be easily regulated; and an accurate three-point positioning mechanism is arranged so that the repeated positioning error can be small.

The invention discloses a bogie frame pedestal seat assembling device, which is used for positioning and assembling the bogie frame, including a tooling carcass, a pedestal seat positioning device and a positioning beam device; One, the geometric center A of the projection of the figure formed by the connection lines of a plurality of pedestal seat positioning devices on the plane where the tooling carcass is located, the geometric center B of the projection of the positioning beam device on the plane where the tooling carcass is located, and The geometric centers C of the projections of the tooling carcass on the plane where the tooling carcass is located are coincident. The pairing device of the present invention can reduce repeated positioning errors and ensure overall assembling dimensional accuracy.

Disclosed are a machining method of ultra-depth vertical turning, and a hinged tool rest special for the same. The method includes: setting a machining program, pulling a tool bar until the axis of the tool bar is perpendicular to the axis of a spindle, moving the spindle, pulling off stop pins after moving the spindle, inserting a positioning insert bar after the axis of the tool bar is superposed with that of the spindle, tightening positioning bolts, and machining a workpiece; after machining, loosening the positioning bolts, pulling off the positioning insert bar to allow the axis of the tool bar to be perpendicular to that of the spindle, re-inserting the stop pins, and taking out the workpiece. The special hinged tool rest comprises a spindle connecting block, a tool bar, a positioning insert bar, stop pins and positioning bolts. The upper end of the spindle connecting block is fixed to a lathe spindle. The lower end of the spindle connecting block is provided with an elongated tool bar mounting groove. The tool bar comprises a tool shank and a tool mounting rack for mounting a tool. The upper end of the tool shank is hinged to a connecting shaft inside the tool bar mounting groove. The machining method and the special hinged tool rest have the advantages that the structure is simple, safety factor is high, repeated positioning has small errors, mounting is quick, and the workpiece is convenient to take and place.

The invention discloses a fully-automatic wireless die change cart and a fully-automatic wireless die change system for a press machine. The fully-automatic wireless die change cart comprises an upper-layer workbench and a lower-layer workbench which are connected together in an up-and-down direction through a drive device, wherein the lower-layer workbench is driven to move in a front-and-rear direction by a drive device I, and the upper-layer workbench moves in a left-and-right direction under the driving of a drive device II; mutually parallel baffles, die lifting arms and guide rails are sequentially arranged at the two opposite ends of the upper-layer workbench from outside to inside, push-pull devices, baffles and fixed support plate assemblies are sequentially arranged at other two ends vertical to the two ends from outside to inside, and the baffles, the die lifting arms, the guide rails, the push-pull devices and the fixed support plate assemblies at the two opposite ends are symmetrical in pairs relative to the central line of the upper-layer workbench; and the baffles, the die lifting arms, the push-pull devices, the guide rails and the fixed support plate assemblies are capable of moving up and down respectively under the driving of a drive device III.

The invention discloses a multi-coating turning blade, and relates to a coating turning tool for use in metal cutting machining. The multi-coating turning blade consists of a blade substrate and a coating which coats the blade substrate, wherein the blade substrate comprises a blade body of which the transverse section is square; the upper end face of the blade body is provided with a chip breaker groove; the chip breaker groove is defined by four groove edges of which the longitudinal sections are trapezoidal; the widths of the top surfaces of the groove edges are smaller than those of the bottom surfaces; the outer side faces of two adjacent groove edges are in transition connection through cambered surfaces; the inner side faces of the groove edges are inclined from the top surfaces of the groove edges to the inside of the chip breaker groove; the outer side faces of the groove edges are inclined from the top surfaces of the groove edges to the outside of the chip breaker groove; the bottom ends of the outer side faces of the groove edges are connected with the side face of the blade body; the coating is of a multilayer structure; the coating comprises a Ti connection layer, a TiN gradient transition layer, an AlZrTiN gradient transition layer and an AlZrTiN outer wear-resistant layer in sequence from the surface of the blade substrate to the outside. Good coiling and breaking effects are achieved on large-sized chips generated in a cutting process, the combination strength between the coating and the blade substrate is high, and the multi-coating turning blade is wear-resistant.

The invention provides an X-ray pulsar navigation sensor online adjusting device and method. the device comprises an X-ray pulsar navigation sensor, a collimator, an optical aligning mechanism, a charge coupling probe, a focal plane receiving screen, a two-axis rotating turntable, a sensor support and a computer. The method includes: preparing, adjusting an optical lens, mounting a preamplifier component, measuring light spots, adjusting the preamplifier component and fastening the preamplifier component. By the device and the method, adjusting accuracy, adjusting speed and adjusting yield ofthe X-ray pulsar navigation sensor can be improved, and performance of the X-ray pulsar navigation sensor can be improved; the device has the advantages of being easy to realize and high in universality, adjusting accuracy and adjusting efficiency.

The invention discloses a non-standard three-tool-bit shank structure for aluminum shell machine base machining. The structure comprises a three-tool-station shank and aluminum shell machining tool blades, wherein three blade installing grooves are milled in the head part of the three-tool-station shank, the shape of the blade installing grooves is matched with the shape of the corresponding aluminum shell machining tool blades, the aluminum shell machining tool blades are fixedly connected with the three-tool-station shank through blade installing screws, and the installing screws are screwedinto installing screw holes in the blade installing grooves. The structure has the advantages that the operation is simple, the problem that the aluminum shell machine base requires tool replacementfor multiple times during machining in the prior art is solved, one shank is provided with the three blades, the machining efficiency of the aluminum shell machine base is improved, and the problems that the aluminum shell machine base is long in production period, high in operating labor intensity, high in production cost and large in machining tool model specification are solved. All machining surfaces of the machine base are machined through the promoted process of one-time clamping and one-tool machining, so that the repeated positioning errors are reduced, the concentricity of machining of the machine base is improved, and the machining quality of the machine base is improved.