170results about How to "Meet the machining accuracy requirements" patented technology

The invention provides an annular thin-wall article clamping device and a using method of the device. The clamping device comprises an annular chassis; the chassis is provided with a radial regulation mechanism of a locating workpiece; the radial regulation mechanism is divided into an inner radial regulation mechanism and an outer radial mechanism; two radial regulation mechanisms position workpiece respectively from the inner side or the outer side of the workpiece; the chassis is respectively provided with track-directed sliding grooves for the two radial adjustment mechanisms; the inner end of the sliding groove of the inner radial regulation mechanism is provided with a stopping block; the outer end of the sliding groove of the outer radial regulation mechanism is provided with the stopping block; the sliding grooves of the two groups of radial regulation mechanisms are disposed at intervals; one of the two groups of radial regulation mechanisms is provided with an axial compacting mechanism for fixing the workpiece; and the axial compacting mechanism is displaced alternatively between the two groups of radial regulation mechanisms when turning the workpiece. The clamping device can realize the processing of two side walls of the workpiece by clamping the workpiece once, and is fit for the clamping of the workpieces with different specifications. The device has the characteristics of high use rate, strong practical applicability, good generality, time saving and labor saving, light labor intensity, high production efficiency and the like.

A scanning method for manufacturing a three-dimensional object layer by layer comprises the following steps: (1), dividing each section layer of a three-dimensional object to be manufactured into a thin-wall area and a non-thin-wall area: setting a threshold of the gap width of the section profile of the three-dimensional object, and according to the gap width of the section profile in x/y direction, dividing a coating area required to be scanned into a thin-wall area and a non-thin-wall area, wherein the thin-wall area is an area of which the gap width of the section profile is smaller than the threshold and the non-thin-wall area is an area of which the gap width of the section profile is greater than or equal to the threshold; (2), according to the thin-wall area and the non-thin-wall area, scanning area by area, wherein the non-thin-wall area is scanned, relatively high photon beam or particle beam power and relatively large light spot diameter are selected, and when the thin-wall area is scanned, relatively low photon beam or particle beam power and relatively large light spot diameter are selected. By the scanning method, constraints of efficiency and precision in the process of manufacturing the three-dimensional object layer by layer are balanced to the maximum extent, so that the efficiency is ensured and the accuracy and the surface quality of a machined part are ensured.

The invention relates to a gantry type rough and finish composite five-axis precision machine tool and a processing method thereof and belongs to the field of precision machine tools. A rack is horizontally arranged; an X-Y feeding component is installed on the rack; a two-axis turntable component is installed on the X-Y feeding component through a Y-direction sliding plate; a sharp knife processing component and a fast removing component are installed on the two sides of a middle cross beam in a gantry shape through a guide rail seat and a vertical plate respectively; and a detector is installed on a sliding plate of the sharp knife processing component. The gantry type rough and finish composite five-axis precision machine tool has the characteristics of high processing efficiency and processing precision and can meet the processing precision requirement for rough milling semi-finish milling; by adopting a five-axis linkage processing method, multi-angle flexible processing can be realized, and the processing process from a blank to a finished product can be completed at one time; as a two-axis turntable is compact in structure, high in rotation precision and good in rapid response characteristic, the gantry type rough and finish composite five-axis precision machine tool has better use reliability; and with three-direction rotation and one sharp knife feeding system moving in a longitudinal feeding direction, multi-dimensional adjustment of a milling cutter processing angle is realized.

The invention discloses a spline curve interpolation algorithm for high quality processing, and the spline curve interpolation algorithm for high quality processing comprises the following steps: quickly pre-interpolating the numerical control machining curve, recording the length of the interpolation path and the maximum/minimum value of the acceleration/deceleration process; calculating the maximum acceleration and most much acceleration of the acceleration/deceleration process, having subsection on the acceleration/deceleration process, calculating quadratic polynomial speed equations of each section; obtaining the speed equation according to the pre-interpolating stage at the real time interpolating stage, adopting the strategy that the theory chord length is close to the practical chord length for building the construction function, estimating the initial value of the interpolation parameter and building the parabolic interpolation polynomial, using the Newton iteration method for exactly calculating the interpolation parameter. The speed plan adopts five-section S curve acceleration/deceleration control algorithm for guaranteeing continuous change of the speed and accelerated speed, the bounded change of the accelerated acceleration speed and the running stability of the machine tool; the calculation of the interpolation parameter adopts the combination of parabolic interpolation method and Newton iteration method for controlling the feeding speed fluctuation of the real time interpolation in the ideal level and satisfying the high quality processing requirement.

The invention discloses a cylindrical workpiece end flat-milling and clamping device which comprises a bottom plate, a V-shaped groove sizing block, a V-shaped groove pressure head, a driving threaded rod and a positioning block. A first vertical plate and a second vertical plate are fixedly arranged on the upper side of the bottom plate. The V-shaped groove sizing block is fixedly arranged on one side of the first vertical plate. The driving threaded rod is arranged on the second vertical plate. The V-shaped groove pressure head is hinged to one end of the driving threaded rod. A circular handle is fixedly mounted at the other end of the driving threaded rod. The positioning block and a support are fixedly arranged on the upper side of the bottom plate and located between the V-shaped groove sizing block and the V-shaped groove pressure head. A pressing shaft used for rapidly and tightly pressing a workpiece is mounted in an unthreaded hole in the middle of the support in a sliding mode. An elastic element is arranged between the end of the pressing shaft and the support. The cylindrical workpiece end flat-milling and clamping device has the following characteristics of quick positioning, good positioning accuracy, high machining precision, reasonable design, simple structure and convenient clamping.

The invention relates to a processing technique for a honing pipe in the fields of aerospace and pressure machinery and the like, in particular to the processing technique for the honing pipe with the tensile strength of not less than 1,140 MPa, the yield strength of not less than 1,030 MPa, the tensile stretch of not less than 16 percent and the specific elongation of not less than 38 percent, and higher requirement on the processing precision. The adopted process is to select a TC4 titanium alloy bar material with proper dimension to finish the processing of the honing pipe with the stated dimension and requirements through the steps of straightening, boring deep holes, honing, turning, polishing and the like according to the processes of roughing, open die forging and heat treatment. The processing technique is simple and efficient with low cost, and satisfies the use requirements on high-performance honing pipes in the fields of aerospace and pressure machinery and the like in China.

The invention discloses a CNC processing smooth transition method and device. The method is used for outputting pulses capable of controlling a servo controller, and the pulses drive the servo controller to control a servo motor to achieve track processing of the servo motor. The method includes the steps that smooth transition parameters are obtained; the radius of a target transition arc segment is obtained, wherein a transition arc segment is obtained according to the smooth transition parameters and a preset arc radius, and the transition arc segment is subjected to error inspection to obtain the target transition arc segment and the corresponding radius; interpolation instruction parameters are obtained, wherein track planning is carried out again according to two line segments and the target transition arc segment, and the interpolation instruction parameters are obtained; the pulses are obtained, wherein interpolation calculation is carried out according to the interpolation instruction parameters, and the pulses are obtained. Smoothness of CNC processed parts is achieved, certain processing precision requirements are met, and the method and device are easy to achieve, short in development period and stable in function.

The invention discloses a method and a device for forming plates through gradual approximation bending on a three-dimensional numerical control plate bending machine (1). The method comprises the following steps of: performing targeted iteration gradual approximation bending by utilizing a resilience rule of a plate (5), comparing a shape of an actually formed curved surface B of the plate (5) subjected to pressing resilience with a shape of a theoretical target curved surface S through online measurement, and setting an approximation bending pressing curved surface C for limited approximation pressing according to an error offset value h after resilience. By the device, an online laser three-dimensional coordinate measuring instrument (4) connected with a computer is arranged on the three-dimensional numerical control plate bending machine (1). Complex mechanical calculation is not needed, the problem of bending resilience of a ship plate can be rapidly solved on line in real time, as long as the approximation bending pressing is performed for 1 to 3 times generally, the requirement on machining accuracy can be met, the problem of resilience of a numerically controlled bent plate is rapidly and effectively solved, the forming accuracy of a three-dimensional curved surface ship plate is guaranteed, and the method and the device have simple and rapid effects.

The invention discloses a pipe blind hole-based drilling and milling machine tool capable of realizing multi-station machining, and belongs to the field of machining. The pipe blind hole-based drilling and milling machine tool capable of realizing multi-station machining comprises a spindle box, a No.1 drilling and milling head, a fixing chuck, a machine tool base, horizontal adjusting seats, a No.2 drilling and milling head, linear sliding way guiding rails, a linear ball screw, a spiral chip removal machine, a chip removal trolley, a dragging servo motor, a nut and a leftward-and-rightward adjustment mechanism. According to the pipe blind hole-based drilling and milling machine tool capable of realizing multi-station machining, power is provided by the servo motor for the linear motion and the rotation motion, the linear positioning accuracy is controlled to be 0.005 mm, the rotation positioning accuracy is 5 arc minutes, and the pipe machining accuracy requirements can be met completely. According to the machine tool, participation of operators is reduced, the labor intensity is reduced, the working efficiency is improved, and the machine tool has the advantages of easiness in operation, low labor intensity, capability of saving time and labor and the like.

The invention discloses a rotary-table center positioning method for a spindle-driving-five-shafts machining center, aiming to solve the technical problem that an existing rotary-table center positioning method for the spindle-driving-five-shafts is poor in implementation. The technical scheme is that center coordinates of a ring gauge under different rotary angles of a rotary table are acquired multiple times and are matched into a circular curve to acquire the circular center and determine the table center. By the method, the problem about positioning of the table center of the spindle-driving-five-shafts machining center under the end milling condition can be effectively solved, the positioning accuracy can reach 0.001mm through detection, and requirements of a machine for machining accuracy can be met.

The invention provides a high-precision tensioning device. The high-precision tensioning device is composed of a stepping motor (2-6), an encoder (2-5), a harmonic reducer (2-7), a rotating disc (2-2), a connecting rod (2-3), a contact (2-4), a force sensor (2-12), a rotating disc connecting piece (2-8), a spacer (2-10), a nut (2-9), a bolt (2-14), a fastening screw (2-13), a shell (2-1) and an end cover (2-11). The tensioning device disclosed by the invention can realize closed-loop control of tensioning force and is used for improving the tensioning precision. If the processing and assembling error meets the design requirement, three contacts can be stably and synchronously tensioned, and the wheel hub positioning precision is improved. According to the invention, synchronous movement of the three contacts is realized by adopting a simple crank block mechanism, the closed-loop control of tensioning force is realized by adopting universal components and parts, the adjustment precision can reach extremely high degree, and the machining precision requirement of the existing wheel hub is met.

A thin-walled casing part non-chatter processing method and a processing fixture thereof, the processing method of the present invention includes the steps of monitoring the condition of a casing during processing by a sensor and determining whether the current processing state of the casing satisfies processing accuracy requirements, if the processing accuracy requirements are not satisfied in result of chatter, adjusting the pressing force of a pressing device in real time by a computer control system to increase the rigidity and dynamic damping of the thin-walled casing part. The fixture includes a work piece outboard clamping device and a work piece inboard clamping device mounted on a base, and the casing is arranged between the work piece outboard clamping device and the work piece inboard clamping device during processing. The work piece outboard clamping device includes an upper compression cylinder and a lower compression cylinder, the work piece inboard clamping device includes an airbag base having an upper airbag and a lower airbag mounted thereon. The top of the airbag base is also provided with an empty pressure corner cylinder. The processing method of the present invention is simple to operate and can ensure the processing accuracy.

The invention relates to a robot milling double-shaft compound cutter device and a method, and belongs to the field of cold and hot compound working in machining. The device consists of a robot driving unit, a connecting bracket, a compound cutter device and a machined workpiece. The compound cutter device comprises a robot connecting shaft, an upper cover, a bearing, a gear set, a shank, a springchuck, milling cutters and a shank cap. The robot driving unit drives the milling cutters in the compound cutter device to rotate to machine the machined workpiece. The robot driving unit is fixedlyconnected with the robot connecting shaft of the compound cutter device to drive a driving gear. The driving gear drives two driven gears to oppositely rotate, so that the two milling cutters are driven to oppositely rotate to realize synchronous milling of double shafts by double side surfaces of the machined workpiece. The device is simple in structure, convenient to install and lower in cost, and replaces the milling cutters to change the side surface sizes of the machined workpiece, namely the thickness of a wall, so as to achieve the machining precision and the surface quality requirements.

The invention discloses a high-precision radiating grinding wheel, and relates to the field of industrial machinery. The high-precision radiating grinding wheel comprises a circular disc body which is divided into three layers, namely, a base layer, a heat transfer layer and a grinding layer which are sequentially arranged, wherein the base layer is prepared from aluminum alloy; the heat transfer layer is prepared from graphite; the grinding layer is prepared from microcrystalline fused alumina; a threaded hole is formed in the center of the circular disc body. The high-precision radiating grinding wheel has the advantage that the problems of the requirement on the processing precision of the grinding wheel, the radiating during processing, and the safety of connection of the grinding wheel and a grinding wheel can be solved.

The invention relates to a speed connection method for a numerical control system, which comprises the following steps: performing dynamic pre-read processing on a workpiece program of the numerical control system to obtain the speed change length and the corner connection error between adjacent workpiece program segments; calculating the initial connection speed between the adjacent workpiece program segments according to the corner connection error, the programming feed speed of the workpiece program, and the processing precision required by a user; and automatically adjusting the connection speed between the adjacent workpiece program segments according to the preset maximum acceleration of each servo shaft of the numerical control system, the speed change length between the adjacent workpiece program segments and the initial connection speed between the adjacent workpiece program segments. The method greatly improves the execution efficiency of a numerical control machine tool, ensures that the connection error generated at a corner between any workpiece program segments in the moving process of the numerical control machine tool satisfies the working accuracy requirements of users, improves the control precision of the system, achieves the speed smooth transition, and can be matched with various acceleration and deceleration algorithms.

The invention discloses an adjustable knife rest. The adjustable knife rest comprises an 80-degree tapered sleeve 6, a machine tool fixing sleeve 7, a 6136 small-planker dial plate 5 and a knife rest fixing block 1, wherein a rectangular groove is formed on the knife rest fixing block 1; two pressing plates 21 and 22 cover on the two sides of the rectangular groove; a knife clamping block 3 and a sliding block 4 are positioned in the rectangular groove and can slide in the rectangular groove; the two ends of the sliding blocks are connected with the knife clamping block 3 and the 6136 small-planker dial plate 5 respectively; the knife rest fixing block 1 is fixedly connected with the 80-degree tapered sleeve 6 and the machine tool fixing sleeve 7; and the machine tool fixing sleeve 7 is connected with a main shaft of the machine tool. In the knife rest, when pipe fittings are machined, the machining cutters of pipe fitting machines with different pipe diameters can be positioned through the 6136 small-planker dial plate 5 and a fine adjustment mechanism without disassembling the knife rest, installing or debugging the cutters, so the adjustable knife rest has the advantages of time saving, high efficiency, accurate positioning, high machining precision and capacity of meeting the requirements of the pipe fitting machines with different pipe diameters on the machining precision.

The invention relates to a central connected periodic structure-based textile product and preparation and application methods there. According to the central connected periodic structure-based textileproduct, conductive areas and non-conductive areas form a central connected periodic structure, wherein the non-conductive areas are not communicated with one another and are in a cross or Y-shaped central connected non-conductive structure, and every non-conductive area, together with a corresponding conductive structure, forms a cross periodic structure unit or a Y-shaped periodic structure unit. The central connecting periodic structure-based textile product can be applied to preparing light and soft textile products, which can shield electromagnetic wave hazards without affecting mobile communication 2G (second-generation, 3G (third-generation) or 4G (fourth-generation networks; compared with conventional electromagnetic shieling textile products which are integrally coated with metalor achieve certain conductive properties, the central connecting periodic structure-based textile product is only locally conductive, thereby achieving frequency selectively transmitting properties as well as good breathable, wearable and comfortable properties.

The invention relates to a revolving table of a large-scale gear hobbing machine, comprising a revolving worktable. The revolving table is characterized in that the revolving worktable, an inner upper ring and an outer ring are respectively connected by bolts; a large worm wheel is connected with the revolving worktable by a bolt; a radial roller and a large roller are installed among the inner upper ring, an inner lower ring and the outer ring; the outer ring is connected with a base of the worktable by a bolt; a worm is installed on a worm support through a first rolling bearing, a second rolling bearing, a third rolling bearing and a fourth rolling bearing which is positioned by a gland bush; a baffle is installed on the worm support and used for installing and positioning the first rolling bearing; and a connection shaft is connected with the worm through a spiale. The invention has the advantages of simple, compact and reasonable structure, convenient manufacture, lower cost, flexible and convenient clearance adjustment, and full satisfaction of requirement for processing precision of gears with large modulus and diameter, thereby being suitable for manufacturers for specially producing mass gears with large modulus and diameter.

The invention discloses an engine crankcase coarse positioning fixture and a positioning method thereof. The fixture comprises a frame, a bottom plate and a plurality of expansion pin components. The bottom plate is mounted on the frame in an up-down movable manner through a driving device. Sliding rails and positioning members are arranged on the bottom plate. The engine crankcase coarse positioning fixture and the positioning method have the advantages of capability of positioning a crankcase reliably so as to meet processing accuracy requirements of technological standards.