77results about How to "Achieve high precision machining" patented technology

The invention discloses an automatic robot device for grinding air feeding and discharging edges of a blade. The automatic robot device comprises a base station, a six-freedom-degree robot, a grinding device, a position changing machine, a three-dimensional laser measurement device and a system control host. The six-freedom-degree robot is arranged on the base station. The grinding device is used for grinding the air feeding and discharging edges of the blade. The position changing machine is arranged on the base station. The three-dimensional laser measurement device is arranged on the position changing machine and comprises a triaxial movement platform and a three-dimensional laser measurement device body. The three-dimensional laser measurement device body comprises two three-dimensional laser outline scanners. The system control host is connected with the six-freedom-degree robot and the three-dimensional laser measurement device. The system control host is used for planning the machining path of the grinding device and a moving path of the three-dimensional laser measurement device and sending the paths and commands to the six-freedom-degree robot to be executed. The automatic robot device integrates self-adaptive grinding and measurement functions, and can guarantee the machining precision of the outlines of the air feeding and discharging edges of the blade.

The invention discloses a spiral bevel gear cutting machine tool and a gear cutting method. The gear cutting machine tool comprises a cutting tool system, a workpiece system, a machine tool body and a numerical control system, wherein the cutting tool system comprises an XZ working table, an X-axis lead screw, a Z-axis lead screw, a short shaft, a tool base revolving drum, a tool base, No.1 milling cutters, a milling cutter shaft, No.2 milling cutters, a gear shaft and a correcting wedge. The rotating centre line of the tool base revolving drum and the rotating centre line of the short shaft are collinear; the right end surface of the tool base revolving drum is fixedly connected with an annular flange plate at the left end of the tool base by the correcting wedge; the right end of the tool base is provided with the milling cutter shaft; the rotating centre line of the milling cutter shaft and the rotating centre line of the short shaft are intersectant; and both ends of the milling cutter shaft are provided with the No.1 milling cutters, the No.2 milling cutters or grinding wheels. The left end surface of the tool base is provided with a drive motor; the drive motor is meshed with a bevel gear on the milling cutter shaft by the gear shaft; and the rotating centre line of the output shaft of the drive motor and the rotating centre line of the milling cutter shaft are vertically intersectant. The invention also provides a method for processing helical bevel gears by utilizing the machine tool.

The invention discloses an aircraft part high-precision matching component processing method based on digital measurement. The method comprises the following steps: the surface of a to-be-processed aircraft component is carved with three cross mark lines; the to-be-processed aircraft component is comprehensively measured by the use of a variety of vision-based digital measurement methods to obtain point cloud data of the surface and center point data of the cross mark lines; a CAD model is provided, and the measured point cloud data and the CAD model are optimally aligned to obtain the position of a to-be-processed contour of the CAD model in the point cloud data and the positions of the cross mark lines in a CAD model coordinate system; the to-be-processed aircraft component is placed and clamped on a processing machine tool, and the work piece coordinate system of the to-be-processed aircraft component on the machine tool is established with the use of the center points of the cross mark lines; the relationship between the work piece coordinate system and the CAD model coordinate system is calculated with the use of the center points of the cross mark lines, and numerical control programming on the to-be-processed contour is performed under the work piece coordinate system; and the to-be-processed aircraft component is processed by the use of a numerical control program.

The invention discloses an optical mirror ion beam nano-precision machining method based on combination of material addition and removal, and the method comprises the following steps: firstly obtaining an addition function, then measuring the surface shape error of a workpiece to be machined, and determining addition residence time according to a two-dimensional convolution formula by taking a numerical value obtained by inversing a measuring result as the additive amount of materials; according to the addition residence time, using an ion beam polishing system to perform deterministic addition control on the workpiece to be machined so as to form a protective sacrificial layer; measuring the surface shape error of the workpiece to be machined again, and then determining removal residence time according to the two-dimensional convolution formula by taking the measuring result as the removal amount of the materials; and using the ion beam polishing system to perform deterministic removal control on the workpiece until removing the protective sacrificial layer so as to complete optical mirror nano-precision machining for the workpiece to be machined. The optical mirror ion beam nano-precision machining method has the advantages of simple processing steps, less investment in equipment and high machining efficiency, and can be used for effectively improving the surface roughness of an optical element, correcting the medium-high frequency error, and the like.

The invention discloses a supersonic-vibration-assisted micro-milling system, comprising a horizontally arranged base, as well as an X-direction sliding way, a Y-direction slide way and a Z-direction slide way which are arranged on the base. Each of the X-direction sliding way, the Y-direction slide way and the Z-direction slide way is provided with a guide rail, a sliding block, a motor and a screw driven by the motor, wherein the sliding block and the motor are arranged on the guide rail, the screw is supported by the guide rail, the sliding block is in threaded connected with the screw. A cushion block is arranged under the guide rail of the X-direction sliding way and is fixed on the base; the sliding block of the X-direction slide way is provided with an electric main shaft arranged along the X direction and the output end of the electric main shaft is provided with a micro milling cutter. The guide rail of the Y-direction slide way is fixed on the base. The guide rail of the Z-direction slide way is fixedly connected with a stand column and the guide rail of the Z-direction slide way and the stand column are both fixedly connected with the sliding block of the Y-direction slide way; and a supersonic vibration platform is mounted on the sliding block of the Z-direction slide way. The supersonic-vibration-assisted micro-milling system can be used for precisely processing a complicated part under a high rotation speed condition and milling a crisp and hard material.

The invention discloses a machining process-oriented mobile robot system calibration method and system. The method comprises steps of constructing different coordinate systems based on a laser tracker; constructing an omni-directional moving platform coordinate system, a robot base coordinate system, a robot tail end flange coordinate system and a to-be-machined workpiece coordinate system througha laser tracker; performing robot kinematics parameter identification based on the laser tracker; measuring target points of a robot under different poses through the laser tracker, establishing a kinematics parameter model, and identifying kinematics parameters; calibrating the motion pose of the robot; correcting the operation parameters of the robot by adopting the calibrated motion parametersso as to calibrate the motion pose of the robot; moving the robot to different stations; performing coordinate system conversion relation calibration based on the laser tracker; measuring a space point target point through the laser tracker, and adopting an improved weighted singular value decomposition algorithm to realize calibration of the coordinate system conversion relationship; performinga machining program, and guaranteeing the correct mobile robot machining process.

The invention relates to a machining load control system based on instruction sequence optimization, which has a structure as follows: a parameter setting module is used for setting machining parameters, a machining constraint condition, a CAD (computer-aided design) data of machining parts and machining codes, providing a geometrical model of the parts and a machining instruction sequence code data, and generating a corresponding parameter file; a learning module is used for learning the cutting load, vibration and machining precision corresponding to the machining instruction sequence of the parts, generating a data file containing the parameter setting information and learning result of the learning module, and providing the cutting load, vibration and machining precision to an analysis module; the analysis module is used for confirming a to-be-optimized position and the machining instruction sequence code and graphically displaying the to-be-optimized position and the machining instruction sequence code; and an optimizing module is used for optimizing the machining instruction sequence, generating the machining instruction sequence code, performing statistic analysis, and generating an optimized machining instruction sequence code file. By using the machining load control system based on instruction sequence optimization, the high-precision machining is realized under the existing condition.

The invention provides a manufacturing method for a high precision pentagonal prism, which delicately utilizes the pentagonal prism angle relation through copying the high precision angle of the square brick and adopts a regular optical cement to realize the pentagonal prism high accuracy processing. The manufacture method comprises steps of using an optical cement supporting body with accuracy being 90 degree+ / -2' to guarantee the perpendicularity between the four working faces of the pentagonal prism and the side to be within 5'and guarantee a second parallel error, using a comparison angle measurement instrument to monitor the upper plate of the angle optical cement, respectively guaranteeing the processing accuracy of a 90-degree angle and a 22.5 degree angle, and guaranteeing a first parallel difference of the part. The invention avoids the process of single-piece angle modification by adopting the high accuracy angle of coping the square brick, produces the batch plates, performs find grinding and controls the parallel. The invention solves the problem that the reworking rate is high and the rate of finished goods is low.

A polishing-force-controlled flexible polishing tool comprises a flexible tool, a chuck base, a connecting plate, a speed reducer, a servo motor, a rack, a force sensor, a force control system and thelike; and the flexible tool is composed of a clamp, an elastic layer and polishing leather. The polishing force in the machining process is tested through the force sensor, the constant machining force is achieved through the force control system, and the high surface quality of an optical element is guaranteed through cooperation of the flexible layer and a polishing pad; intermediate frequencyerrors are prevented from being generated in the machining process; and the removal function can be adjusted in the machining process, the edge effect is reduced, and high-precision machining of the optical element is achieved.

The invention discloses a grinding fixture for diamond drilling tools. The grinding fixture comprises a spring chuck, a stepper motor, a connecting rod, an arc-shaped slide rail, a slider cylinder, a feed screw and a slide platform. The spring chuck for clamping a diamond drilling tool to be ground is fixed to one end of the stepper motor of a driving device, the stepper motor is connected to the lower side of the arc-shaped slide rail by the connecting rod in such a manner that the head end of the spring chuck is downwardly and obliquely arranged, the arc-shaped slide rail is mounted on the lower surface of an extending end of a cantilever of the slider cylinder, the feed screw is mounted on the upper side of the slider cylinder, the feed screw and the slider cylinder are matched with each other and can adjust the height of the diamond drilling tool to be ground, and the slider cylinder is fixed onto the slide platform. The grinding fixture for the diamond drilling tools has the advantages that the concentricity of four blades of the diamond drilling tool is greatly improved, the quality of a product is improved, and the grinding fixture is simple in operation and high in machining production efficiency.

The invention discloses a computer numerical control grinding machine dedicated to the grinding machining of an outer-ring excircle and an inner-ring outer raceway of a bearing. The computer numericalcontrol grinding machine is characterized in that a head frame seat and an abrasive wheel frame backing plate device are mounted on a machine body; an electromagnetic chuck used for clamping a ring blank is arranged at the front end of the head frame seat; an abrasive wheel seat and a two-coordinate trimmer are arranged on the abrasive wheel frame backing plate device; a hydrodynamic-hydrostaticelectric spindle is arranged in the abrasive wheel seat; an abrasive grinding wheel is arranged at the front end of the hydrodynamic-hydrostatic electric spindle; a hydrodynamic-hydrostatic oil tank is connected with the tail end of the hydrodynamic-hydrostatic electric spindle; the abrasive grinding wheel is positioned on one side edge of the electromagnetic chuck; a trimming head used for trimming the abrasive grinding wheel is arranged on the two-coordinate trimmer; a rotatable diamond wheel and a trimming blade are arranged on the trimming head; a feeding device used for automatically conveying the ring blank is arranged on the machine body and positioned on the other side of the electromagnetic chuck; a truss-type manipulator with a visual sensor is arranged between the feeding deviceand the electromagnetic chuck; and a cooling liquid spray pipe is arranged above the abrasive grinding wheel. By adoption of the computer numerical control grinding machine, the full-automatic high-precision grinding of the outer-ring excircle and the inner-ring outer raceway of the bearing can be achieved; the operation is simple and convenient; and the machining efficiency is high.

The invention discloses a modular translational electric door driving device based on a linear motor and a driving control method thereof. The device comprises a stator module, a track module and a mover module; the stator module comprises a housing, a linear motor stator core, a winding, a driving control panel and a position detector; the mover module comprises a mover support and a mover core;and the driving control algorithm comprises an operating parameter self-detection algorithm and a running track optimization algorithm. The driving device and the driving control algorithm thereof adopt a modularized and drive control integrated structure, the mechanical and electrical structure is simple, the installation is convenient, the mechanical friction is small, the operation noise is lowand the system reliability and the service life are high, the non-smooth control algorithm is employed to achieve stable transition of each operation stage, the singular perturbation control method is employed to achieve accurate determination of obstacles, and the control algorithm is employed so that the precision is high and the adaptability is high.

The invention relates to a precise grinding processing method for an aspheric array structure. A machine tool which is in linkage with an X-axis, a Y-axis, a Z-axis and a C-axis fourth axis are used for processing, the workpiece is installed on a C axis of the machine tool main shaft for controllable rotary motion, simple harmonic motion of phase difference Pi / 2 in X-axis and Y-axis directions along with rotation of C-axis under control of machine tool, meanwhile, an X-direction or a Y-direction superposition motion is superimposed on the X-direction or the Y-direction, and the Z-axis is usedfor carrying out corresponding movement according to the surface shape of the subunit. The processing method breaks through the limitation that an existing array processing method can only process a spherical array on a hard brittle material, and a non-spherical array structure can be precisely machined on the hard brittle material.

The invention discloses an ultrahigh-precision gear wheel which comprises a wheel skeleton, a bearing and a cylindrical roller. A fixing hole is arranged in the wheel skeleton, the bearing is fixed in a fixing hole; and the cylindrical roller is assembled in the bearing. The invention also discloses an ultrahigh precision complex curve rack matched with the gear wheel, wherein a sawtooth in accordance with the parabolic movement path of the ultrahigh-precision gear cylindrical roller is arranged on the upper surface of the rack. The invention further discloses a processing method for the rack. The ultrahigh-precision gear wheel and the processing method have the following advantages: 1. stress of the gear wheel can be adjusted automatically, the transmission precision of the gear wheel is improved, and the noise during the transmission process of the gear wheel is lowered; 2. the tooth surfaces of the rack conform to the movement locus of the gear cylindrical roller so as to realize gapless precision transmission with ultralow transmission; and 3. a repeatedly progressive type processing method is adopted for the rack so as to realize high precision processing.

The invention discloses a machining device for a full-surface micro-pit structure of a thin-wall spherical shell type micro-component, and relates to the technical field of micro-component surface machining devices. The problems that under the constraint of the micro-space scale, the thin-wall spherical shell type micro-component has special structural characteristics, is non-uniform in material, asymmetric in surface and has tiny surface defects, and fluid mechanics is not stable in the machining process are solved. According to the machining device, a base is made of granite materials, and therefore vibration can be well absorbed; a high-precision linear unit and a high-precision rotating unit are adopted as main moving parts of the device, and a workpiece clamping system, a high-resolution CCD monitoring system, a zero point positioning system and a turning secondary clamping quick-change system are installed on the base in a centralized mode; the structural design is compact, and the technical problems of clamping, turning, tool setting, capturing and recognizing of the micro-pit structure and the like of the thin-wall spherical shell type micro-component can be effectively solved; and an air static pressure workpiece shaft is adopted for rotational motion of a workpiece, a milling shaft is obliquely arranged, and therefore the high machining speed and the high machining precision can be achieved.

The invention belongs to the field of electromachining and provides a combined electromachining method for a bamboo-like micro-structure of a rotating body inner surface. The method includes the following steps that 1, a hollow aluminum rotating body, a hollow copper rotating body and an aluminum core model (3) are manufactured; 2, aluminum ring slices (1) and copper ring slices (2) are machined; 3, the proper aluminum ring slices (1) and the copper ring slices (2) are selected according to the bamboo-like structural morphology, required to be manufactured, of the rotating body inner surface to be embedded into the aluminum core model (3) according to the aluminum-ring-copper ring multi-layer interval sequence; 4, electric copper casting machining is carried on the aluminum core model (3) where the aluminum ring slices (1) and the copper ring slices (2) are embedded, and an electric casting (4) is obtained; and 5, the electrically-cast rotating body is cleaned, aluminum materials are removed through an alkaline solution, and the bamboo-like micro-structure (5) of the rotating body inner surface made of copper is obtained. By means of the combined electromachining method, high-precision machining of the bamboo-like micro-structure of the rotating body inner surface is achieved.

The invention discloses a flat-cup non-slip bolt bar knurling and thread rolling device. The flat-cup non-slip bolt bar knurling and thread rolling device is characterized in that a moving-die knurling plate is oppositely arranged with a fixed-die knurling plate, the moving-die knurling plate is fixed right above a moving-die thread rolling plate, the fixed-die knurling plate is fixed right above a fixed-die thread rolling plate, thread rolling lines are respectively formed in opposite side walls of the moving-die thread rolling plate and the fixed-die thread rolling plate, knurling lines are respectively formed in opposite side walls of the moving-die knurling plate and the fixed-die knurling plate, the moving-die thread rolling plate and the moving-die knurling plate can reciprocatingly slide dies along the extension direction of the thread rolling lines and relative to the fixed-die thread rolling plate and the fixed-die knurling plate, a first avoidance notch with a set length is formed in the side wall of one side of the fixed-die knurling plate and facing to the moving-die knurling plate and is located in one end of the bolt feeding direction, and a second avoidance notch with a set length is formed in the side wall of one side of the moving-die knurling plate and facing to the fixed-die knurling plate and is located in one end of the bolt discharging direction. By the arrangement, knurling and thread rolling of a flat cup bolt can be completed simultaneously, and the flat-cup non-slip bolt bar knurling and thread rolling device is high in machining efficiency, low in machining cost and high in precision of knurling and thread rolling.

The invention discloses a femtosecond laser preparation system and method for a silicon photonic crystal waveguide device. The femtosecond laser preparation system for the silicon photonic crystal waveguide device comprises a femtosecond laser, a multistage half-wave plate, a polarization splitting prism, a first reflecting mirror, a spatial light modulator, a first lens, a second reflecting mirror, a third reflecting mirror, a second lens, an electric flip mirror, a fourth reflecting mirror, a high-power objective lens, a three-dimensional processing platform, a third lens, a CCD camera and acomputer. Lasers output by the femtosecond laser pass through the multistage half-wave plate and the polarization splitting prism and pass through the reflecting mirrors to shoot into the spatial light modulator. A processing scheme is generated to a hologram by the computer, and the hologram is loaded to the spatial light modulator. After modulation is completed, light beams pass through the first lens, the second reflecting mirror, the third reflecting mirror, the second lens and the fourth reflecting mirror, and then are focused on a silicon substrate through the high-power objective lens,the movement of the three-dimensional processing platform is controlled by a program input into the computer to complete the processing task. The femtosecond laser preparation system and method for the silicon photonic crystal waveguide device has simple processing steps, high processing accuracy, high processing speed and low processing cost.

The present invention provides a numerical control machine tool thermal coupling error modeling and compensation method considering machining parameters. The method comprises: establishing a numericalcontrol machine tool spindle thermal error model and a numerical control machine tool spindle unit milling force and temperature field model under the load milling condition; combining the numericalcontrol machine tool spindle thermal error model and the numerical control machine tool spindle unit milling force and temperature field model, and establishing a numerical control machine tool spindle unit thermal coupling error model; establishing a numerical control machine tool spindle unit three-way force prediction model considering process parameters; and constructing a thermal coupling error model considering milling process parameters. According to the method provided by the present invention, the thermal error of the spindle and the error caused by the milling force under the load milling condition of the numerical control machine tool are considered, high-precision machining of the numerical control machine tool spindle under different milling conditions is implemented, a machine tool spindle unit thermal coupling error model with strong robustness and adaptability is constructed, and certain guiding significance is provided for the follow-up research on the numerical control machine thermal coupling error modeling.

The invention discloses a processing device used for an inner wall of a barrel body. The processing device comprises a power motor (1), a base plate (2), a connecting rod (3), a blade (4) and a driving mechanism that is used for driving the connecting rod (3), wherein one end of the connecting rod (3) is connected with a piston of an air cylinder, the blade (4) is arranged on the other end of the connecting rod (3), one end of the connecting rod (3), which is arranged near the driving mechanism, is articulated with the base plate (2), and an output shaft of the power motor (1) is connected with the blade (4). The processing device also comprises a flexible shaft (6), wherein one end of the flexible shaft (6) is connected with the output shaft of the power motor (1), and the other end of the flexible shaft (6) is connected with the blade (4). The processing device can be used for processing the inner wall of the barrel body through the regulation for the processing height and the processing angle, thereby not only improving the production efficiency but also reducing the processing difficulty; moreover, the processing device can effectively process the curved surface of the inner wall of the barrel body and can transmit torque of the motor from a great distance without the affection of curvature.

The invention provides a semi-conical wave-transparent radome machining device and method, and particularly relates to a high-precision and high-efficiency machining device and method for a ceramic matrix composite material complex structure semi-conical wave-transparent radome. According to the structural characteristics of the wave-transparent radome, a machining process route is formulated and optimized, and a whole radome turning machining scheme, a whole radome subdivision machining scheme and a half radome matching surface milling machining scheme are formed; a special machining device is designed, so that the machining efficiency is remarkably improved while the machining precision is guaranteed; and for a complex structure of a tenon-and-mortise groove in a radome body, a feeding path of linear driving multi-tool-path parallel processing is adopted, and the five-axis machining technology is used for machining on a three-axis machine tool. By means of the process method, the problems that in the workpiece machining process, the positioning difficulty is large, the machining efficiency is low, and a complex mortise and tenon joint structure is difficult to machine are solved, high-precision machining of the meter-scale large-size wave-transparent half radome is broken through, and important guarantee is provided for development and production of workpieces of series models.

The invention discloses a processing method for polycrystalline diamond. The processing method comprises the following steps: (1) preparing a die; (2) filling a graphite pipe or a metal cup with diamond micropowder with the particle size of 1-30 mu m and the die according to the shape of a finished product, and carrying out sinter molding under the conditions of high temperature and high pressureto prepare a semi-finished product; and (3) removing the die on the semi-finished product by using sand blasting or a corrosive liquid to obtain the polycrystalline diamond with the required configuration or structure, wherein the corrosive liquid contains hydrofluoric acid and nitric acid. By using the processing method disclosed by the invention, the configuration or structure of the polycrystalline diamond can be processed into the required specific shape, the high-precision processing of the complex surface and spatial shape of the polycrystalline diamond can be realized, and therefore, special-shaped polycrystalline diamond is obtained; and compared with a traditional method, the processing method disclosed by the invention is cheaper, more convenient and rapider, free of special equipment and relatively high in operability.

The invention discloses a belt wheel type pad printing machine. The pad printing machine comprises a machine frame, a printing plate table, a profiling jig and a printing mechanism, wherein the printing plate table, the profiling jig and the printing mechanism are located on the machine frame; the printing plate table is detachably installed on the machine frame and provided with a concave pit used for storing printing ink; the profiling jig is used for fixing a to-be-printed workpiece; the printing mechanism comprises a printing part which is used for sucking the printing ink from the printing plate table and printing the printing ink onto the workpiece, and a first driving assembly which is used for driving the printing part to move between the printing plate table and the profiling jigback and forth; and the printing part comprises a plurality of rotatable roll shafts, and a pad printing belt arranged on the multiple roll shafts in a sleeving mode. The invention further discloses aprinting method of the belt wheel type pad printing machine. Through the belt wheel type pad printing machine and the printing method thereof, high-precision machining is conducted on full size, single-curved surface and multi-curved surface products, the precision is high, and the performance is stable.

The invention provides an error sensing compensation method for precision machining. The error sensing compensation method comprises the following steps that S1, a control unit receives a machining instruction and outputs a first control command to control an execution part to perform a first action; S2, the execution part automatically outputs a sensing variable in the action process and feeds back the sensing variable to the control unit; S3, the control unit outputs a second control command to control the execution part to perform a second action so as to correct the sensing variable to a set range; S4, if machining is continued, a system returns to S2; and if machining is completed, the control unit controls the execution part to stop acting. According to the method, force and / or displacement adjustment of a tool nose and a workpiece is finally realized through self-sensing and self-driving of a tool according to various complex factors influencing the machining precision, so that accurate error compensation is realized, the final machining precision is further realized, the complex problem is simplified, and the machining precision is greatly improved.

The mobile phone glass detection equipment comprises a first material supplementing conveying line, the first material supplementing conveying line is sequentially provided with an unstacking area, a feeding area and a stacking area in the conveying direction, and an unstacking jacking mechanism and a stacking jacking mechanism are arranged at the positions, corresponding to the unstacking area and the stacking area, of the bottom of the first material supplementing conveying line correspondingly; the station turntable mechanism comprises a rotary table, and jigs for fixing glass sheets are arranged on the corresponding stations of the rotary table; the manipulator is used for transferring the glass sheets in the feeding area to the jig and transferring the glass sheets on the jig to the feeding area; the positioning mechanism is arranged at the lower end of the rotary worktable and is used for adjusting the position of the glass sheet on the jig before detection; the first detection mechanism is arranged at the next rotating station of the positioning mechanism and is used for carrying out defect detection on the glass sheet on the jig; the invention provides mobile phone glass detection equipment, and aims to improve the production efficiency and realize the automation of mobile phone glass processing.

The invention discloses a method for reducing the flatness error of a double-sided grinding workpiece, and belongs to the field of mechanical grinding and polishing machining. In the machining process of a double-sided grinding machine, a workpiece still rotates in a wandering star wheel; and in order to ensure the movement uniformity of the workpiece surface in the double-sided grinding process, a certain distance exists between the center of the wandering star wheel and the center of the workpiece. The method is used for calculating planetary motion with eccentricity and autorotation, and comprises the following steps: firstly, calculating the material removal difference of an upper disc and a lower disc by measuring the rotating speed in the machining process; secondly, obtaining turn-over time by calculating surface shape changes of the upper surface and the lower surface; and finally, realizing the convergence of the double-sided flatness by turning over for multiple times. According to the method, the planeness of the upper surface and the lower surface of the workpiece can be greatly reduced on the basis of double-face grinding, and high-precision machining can be achieved on a grinding disc with poor precision.

The invention discloses an upsetting-extruding forming method for a conical check ring. The upsetting-extruding forming method is used for punch forming of a check ring with a tapered end face on oneside, and comprises the following steps:1, taper angle forming of the check ring is realized by using an angle upsetting die; and 2, leveling of the horizontal end face and the taper angle end face ofthe check ring is achieved through a separating and leveling die, and the check ring is separated from the waste materials. According to the upsetting-extruding forming method, high-precision machining of the check ring is achieved by conducting the angle upsetting procedure and the separating and leveling procedure on the check ring, and meanwhile the machining efficiency is effectively improved.