786results about How to "Reduce machining errors" patented technology

The invention provides a vertical five axle interlocked gantry digital control milling machining center, comprising a planer body, a portal frame, a rotary workbench stand, an electrical appliance control cabinet, a cutter, a main spindle box, an operation panel, a rotary workbench, X, Y and Z shaft driving screws and rotary tool changers, wherein the rotary workbench is formed by a large rotary workbench and a small rotary workbench which respectively rotate around an A shaft and a B shaft; the portal frame is arranged on the planer boxy and can move back and forth via the X shaft driving screws arranged at the two sides of the planer body, a Y-Z shaft connection block moves left and right via the Y shaft driving screw in the portal frame, and a main spindle in the main spindle box moves up and down via the Z shaft driving screw on the Y-Z connection block so as to form five axle interlocking; and the rotary tool changers arranged at the two sides of the portal frame are internally provided with 32 grinding cutters and milling cutters, and tool changing is realized by a tool changing manipulator. The invention has the positive effects of realizing multiply functions of one machine, and can process as many as five interfaces by primary clamping, thus reducing clamping times, saving labor, time and space, and having convenient equipment maintenance.

The invention discloses a five-coordination numerical control machine tool motion controller with an interpolation function, and relates to a numerical control machine tool motion controller. The purpose of the invention is to solve the problems that the functions of the controller can not be easy to be expanded and modified, which is caused by the poor openness and flexibility of the existing numerical control machine tool motion controller, and the requirements of a configurable motion controller can not be met, and NC program size is seriously limited, which is caused by the multiplication of information amount in the controller by adopting a type value point direct interpolation method. The motion controller comprises a man-machine interface module, a task coordination module, a task generation module, an axis group module, an axis module, a reverse motion transformation module, a control rule module and a discrete logic control module. When the NURBS interpolation method of the invention is adopted to carry out NC machining, the NC program is reduced substantially; meanwhile, the machining error is more greatly reduced than the linear interpolation error. By adopting a modularized systematic structure, the requirements of the configurable motion controller can be met, the openness of the numerical control system can be enhanced, and the function expansion and modification of the controller can be carried out on the specific modules.

The invention discloses a closed cycloid precision gear reducer. The closed cycloid precision gear reducer comprises an input part, a pin wheel housing, an output part and a small-tooth-difference inside-gear reducing mechanism. Wheel pins used for being meshed with a cycloidal gear of the small-tooth-difference inside-gear reducing mechanism are arranged on the inner ring of the pin wheel housing in the circumferential direction. The inner ring of the pin wheel housing is provided with containing grooves which correspond to the wheel pins in a one-to-one mode and are used for containing the wheel pins. The wheel pins make double-line contact with the inner walls of the corresponding containing grooves. According to the closed cycloid precision gear reducer, the double-line contact characteristic exists between the wheel pins and the containing grooves in the pin wheel housing; as the wheel pins make double-line contact with the corresponding containing grooves in the tooth width direction, the bending strength is enhanced, and carrying capacity is improved; meanwhile, due to the increase of the number of contact lines, the achievement of the error leveling effect is facilitated, transmission accuracy can be improved, and then the requirements for machining errors and assembly errors can be lowered. Compared with an existing RV gear reducer, the return difference of the closed cycloid precision gear reducer is smaller; besides, the closed cycloid precision gear reducer is compact in structure, long in service life, simple in machining process and low in manufacturing cost.

The invention discloses a multi-station combination machine tool, which is characterized in that the machine tool comprises a rotatable worktable shaped like a circle or a regular polygon-shaped on which a plurality of stations are annularly arranged; one or a plurality of machine tools are arranged in the location of each station corresponding to at least part of the stations; a tool equipment of a positioning workpiece is arranged on the corresponding station in a processing location of the corresponding machine tool. The multi-station combination machine tool of the invention has high processing efficiency and high precision.

The invention relates to a constant-force grinding and polishing tool system and belongs to grinding and polishing tools. The constant-force grinding and polishing tool system comprises a power device, a gear change grinding tool, a damping device, a guide device, a force compensation and detection device and a counter weight device to realize constant-force grinding. A grinding tool head guarantees the gear change grinding tool to move vertically by the aid of the guide device to form a blade normal grinding and polishing force through total weight resultant force of the tool system and a low-friction countercylinder. A tool head normal force is measured and compared with a set value by an S-type sensor, a final value is fed back to a computer, and the low-friction countercylinder is regulated and controlled for force compensation by an electrical appliance proportional valve. The power device insulates vibration influences of a motor vibration source on the tool system by the aid of the damping device, and high-precision force control is realized through feedback of the S-type sensor. The constant-force grinding and polishing tool system has the advantages that the system is novel in structure, constant-force polishing of blade surfaces with different curvatures is realized, surface uniformity is realized, residual stress is diminished, and polishing efficiency is improved.

The invention relates to an profile hole assemble boring machine, which comprises a machine tool base, a principal axis motor, a gyrus worktable and a chucking mechanism which are arranged on the machine tool base. A clamp spring groove and an inner-outer chamfer angle and outside chamfer angle boring feed mechanism are arranged one side of the machine tool base. The rotor of the principal axis motor is directly connected with the principal axis. The invention adopts the direct connection transmission of the motor rotor and the principal axis to improve the processing precision. Because of without the belt unloading system, the vibration of the machine tool due to belt chattering is avoided, thereby reducing breakdown and avoiding the boring head heating-up phenomenon due to bearing heating. Because the clamp spring groove and the inner-outer rotating angle boring feed mechanism are arranged on the machine tool base, the precise processing of a piston profile hole, the clamp spring groove, the inner chamfer angle and outer chamfer angle are realized, thereby reducing the processing sequence, decreasing the processing error and improving the processing precision.

The invention relates to a large thin-walled component complex curved surface mirroring processing method, and belongs to the technical field of large thin-walled component processing, and especiallyrelates to a large thin-walled component complex curved surface mirroring processing method. An employed processing device is laid in a bilaterally symmetrical structure, the specially-produced processing device is employed to carry out measuring and mirroring processing, a line laser sensor is employed to measure a workpiece, a current vortex sensor is employed to measure displacement with respect to the workpiece surface, and a piezoelectric transducer is employed to measure the value of a support force. Noise removal, data compaction, data splicing are carried out on measured data, and a target curved surface is generated. Processing path planning and support path planning are carried out, a local normal vector and a dynamic support force are measured, and mirroring milling is carried out. According to the invention, after once clamping installation, measuring and mirroring processing can be carried out on the thin-walled component, and the large thin-walled component complex curvedsurface mirroring processing method is good in measuring real-time performance, high in accuracy and convenient to use. Accurate milling of thin-walled components can be achieved, the processing precision is high, and the surface quality is high after processing.

The invention belongs to the technical field of high-quality and high-efficiency milling of complex curved surface parts, and relates to a global optimization method for a cutter-axis vector based onthe minimum angular acceleration of a machine tool rotating shaft. The method comprises the steps of generating a cutter track by using an equal residual height method according to the curved surfaceand cutter characteristics; establishing an inverse kinematics relation of a five-axis machine tool; converting the cutter-axis vector under the workpiece coordinate system into a rotation angle valueof rotary feeding shaft of the machine tool, calculating the angular speed and the angular acceleration of the rotary feeding shaft of the machine tool by using a finite difference method; calculating a feasible space of the cutter axis at the position of a cutter contact point by means of a C space method according to an interference judgment criterion, judging the concavity and convexity of a cutter path curve, and determining a key cutter-axis vector on the cutter path curve; and optimizing the cutter-axis vector by taking the minimum angular acceleration in each interval as an objective.The method can effectively reduce the angular acceleration of the rotary feeding shaft of the machine tool in the machining process, realize the stability of the machining process, improve the surfacemachining quality and reduce the machining contour error.

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 displacement-adjustable precision locating platform. The displacement-adjustable precision locating platform comprises a base, a manual adjustable frame sliding table platform, a platform cushion block, a compliant hinge precision locating platform body, four electromagnetic armatures, two Z-axis right-angle junction plates and electromagnetic drivers. The manual adjustable frame sliding table platform can achieve three-freedom-degree precision locating adjustment through a cross rotating guide rail. The platform cushion block is arranged on a sliding table through four evenly-distributed threaded holes. The middle of the compliant hinge precision locating platform body is fixed to the platform cushion block through two threaded holes, and therefore the platform can achieve displacement in the X-axis direction and Y-axis direction along with the manual adjustable frame sliding table platform. The four electromagnetic armatures are fixed in the four directions of the compliant hinge precision locating platform body in a threaded connection manner. The two Z-axis right-angle junction plates are in threaded connection with the base of the platform. The electromagnetic drivers serve as drive equipment of the platform and are in threaded connection with the Z-axis right-angle junction plates to be connected with the base of the platform. The displacement-adjustable precision locating platform is simple in structure, small in overall size, low in cost and convenient to operate, and the high-precision locating requirement can be met.

The invention provides a thermal deformation error compensation method for a dry-cutting numerically-controlled gear hobbing machine tool and workpieces. According to the invention, while thermal deformation error compensation is carried out on the dry-cutting numerically-controlled gear hobbing machine tool by virtue of a thermal deformation error compensation system for the numerically-controlled machine tool, the thermal deformation errors of workpieces machined by the dry-cutting numerically-controlled gear hobbing machine tool are compensated by virtue of the same compensation system. The thermal deformation error compensation method comprises the following steps: firstly, establishing a thermal deformation error model for the workpieces and a thermal deformation error model for the dry-cutting numerically-controlled gear hobbing machine tool, integrating said error models in an online compensator, and during machining of the dry-cutting numerically-controlled gear hobbing machine tool, processing the temperature data obtained through measurement of temperature sensors by virtue of the online compensator to obtain error compensation values; secondly, conveying the compensation values to a machine tool numerically-controlled system; and finally, carrying out coordinate offset by virtue of the numerically-controlled system, thus realizing thermal deformation error compensation for the dry-cutting gear hobbing machine tool and the workpieces.

The invention provides a bionic cobweb for capturing in orbit and its holding method. The bionic cobweb for capturing in orbit takes a hollow rope as a radial line; multiple holding cabins for holding side contour lines or inner contour lines are arranged in the bionic cobweb. Thus the holding of the bionic cobweb can be realized under the condition of not increasing other structures.

The invention provides a tooth received-force testing device which comprises at least one tooth crown simulating part and a sensor connected with the tooth crown simulating parts. The tooth crown simulating parts are combined to form a dentition model, and the sensor is used for measuring force received by teeth in the dentition model. During correcting force testing, a to-be-tested tooth corrector is worn on the dentition model, and correcting force applied on the teeth on the dentition model by the tooth corrector is transmitted to the sensor, so that six-dimensional parameters of the correcting force can be measured. The invention further provides a method utilizing the tooth received-force testing device to test the force received by the teeth.

The invention provides a door and window tool table, which is connected with a control system; the door and window tool table comprises a support plate (1) for placing a door and window (6), two movable clamp seats (2) arranged at the one short edge side of the support plate, two fixing clamping seats (3) fixed at the other short edge side of the support plate, and a pressing device (5), wherein the pressing device (5) is movably connected with the support plate (1) by sliding devices (4) fixed at two long edge sides of the support plate (1) and is used for pressing the door and window (6). The door and window tool table can be used for positioning and pressing the door and the window effectively, so the machining error of the door and the window can be reduced, the machining precision is improved, the structure is simple, the machining is easy, and the production efficiency is effectively improved.

The invention relates to a special numerical control machine tool for milling an end face, drilling a center hole and lathing an outer circle of a thin and long piston rod part of a special device in the filed of petroleum, in particular to a special numerical control machine tool for milling an end face, drilling a center hole and lathing an outer circle of a thin and long shaft part. The machine tool comprises a main shaft box, a main shaft box base, a clamping and guiding device, a clamping and feeding device, material supporting frames and a machine tool body. The main shaft box comprises three main shafts, namely the milling main shaft, the drilling main shaft and the lathing main shaft, and the main shaft box is supported on the main shaft box base which is connected with the machine tool body below. The clamping and feeding device is connected with the clamping and guiding device, wherein the clamping and feeding device and the clamping and guiding device clamp a workpiece together and perform workpiece feeding, and the material frames only play a role in supporting parts. According to the numerical control machine tool, three processes, namely milling the end face, drilling the center hole and lathing the outer circle of a thin and long shaft are finished through one-time clamping, the working efficiency is high, clamping, positioning, the feeding amount and the feeding speed are numerically controlled, the machining precision is high, and the rejection rate is low.

The invention discloses an AI-based automatic weld path identification method. Three-dimensional model data of a workpiece needing to be welded is imported into a welding robot controller, and the imported three-dimensional model data of the workpiece comprises the overall structure of the workpiece needing to be welded and position information of a weld in the workpiece. Compared with a traditional automatic welding technology, the method has the advantages that a large amount of programming demonstration time can be shortened, and the production efficiency is improved; welding paths can be rapidly generated for different workpieces, and the link of designing complex tools is reduced; the problem of machining errors or position deviation existing in discharging of the workpiece can be well solved by using the method; and different welding modes such as fillet welding, vertical welding and lap welding can be automatically adjusted by applying the method for different welding types.

The invention discloses a thermal deformation suppression middle type high-speed crown block gantry five-axis machining center. A workbench is directly cast on a base; a left bridge and a right bridge are installed on the two sides of the base; linear guide rails are installed on the left bridge and the right bridge correspondingly; a cross beam is installed on the left bridge and the right bridge through X-axis sliding blocks on the two sides; the middle of the cross beam is hollowed-out; four guide rails are arranged on the upper side and the lower side of the cross beam; and a left sliding base and a right sliding base are installed in the middle of the cross beam through the sliding blocks. A left ram and a right ram are connected into a whole through a Y-axis sliding block and a connection board, four linear guide rails are arranged on the rams, and the rams are installed in the middle of the left sliding base and the right sliding base through Z-axis sliding blocks. The middle type design of the movement components in the thermal deformation suppression middle type high-speed crown block gantry five-axis machining center effectively conduct temperature rise generated by movement, so that structural deformation is uniform and influence of thermal deformation on the precision machining of products is reduced. The thermal deformation suppression middle type high-speed crown block gantry five-axis machining center is stable in operation and performance and suitable for precision machining in the automotive die field.

The invention discloses a finish machining method for large parts difficult to cut, which comprises the following steps of: (1) generating a part profile finish machining track; (2) selecting a machining tool to perform finish machining on the part profile according to the part profile finish machining track; (3) measuring the part profile subjected to finish machining to obtain a machining errorcompared with a theoretical value of the part profile; (4) generating a new part machining track according to the machining error, wherein the new part machining track and the part profile subjected to finish machining are in mirror image relationship relative to the theoretical part profile; and (5) adopting another machining tool same as the machining tool, and performing finish machining on the part subjected to primary finish machining by adopting machining parameters same as those in the primary finish machining according to the new part machining track. In the method, tool wear adaptivecompensation is adopted, part errors generated due to tool wear are effectively reduced, and the part machining accuracy and production efficiency are improved.

The invention discloses a real-time online detection and compensation device for thermal elongation deformation error of boring spindles of a numerical control machine tool and aims at mainly solving the problems that the machining precision of an existing numerical control machine tool is poor caused by thermal elongation deformation of the boring spindle. The real-time online detection and compensation device is characterized by comprising detection shaft sleeves made of materials with a low thermal expansion coefficient, a positioning disc, detection rings, transfer screws, displacement sensors, sensor mounting bases, a PLC (Programmable Logic Controller) simulation input module, a temperature compensation functional module of a numerical control system and a ball screw pair, wherein each detection shaft sleeve is arranged inside the corresponding boring spindle and outside a broach rod; the front end of each detection shaft sleeve is rigidly coupled with the corresponding boring spindle through the positioning disc; the rear end of each detection shaft sleeve and the corresponding detection ring can freely move relative to the corresponding boring spindle in the axial direction; the thermal elongation deformation error is detected by the displacement sensors and is fed back to the numeric control system; the real-time online detection and compensation of the thermal elongation deformation error of the boring spindles are realized by the temperature compensation function of the numeric control system. After the device and the detection and compensation method are applied, the machining error of the numeric control machine tool caused by the thermal elongation deformation error of the boring spindles can be greatly reduced, the preset control precision of the machine tool is guaranteed, and better economic and social benefits are achieved.

The invention discloses a small multi-axis linkage ultrasonic vibration---an electromagnetic auxiliary increasing and decreasing material processing device. The device comprises a steering movable workbench, an ultrasonic vibration---electromagnetic auxiliary device, a mill---milling composite processing device and a laser cladding device, wherein a machine tool base is arranged below the mill---milling composite processing device, the ultrasonic vibration---electromagnetic auxiliary device is fixedly installed on the steering movable workbench, the steering movable workbench is installed on the machine tool base, and the laser cladding device is fixedly arranged on the right side of the upper surface of the machine tool base. According the device, through the steering movable workbench, the process switching of the mill---milling composite processing and the laser cladding processing can be achieved under the condition that workpieces need not to be loaded and unloaded, the processingerror is reduced, and the processing efficiency and the processing precision are improved; in addition, the ultrasonic vibration---electromagnetic auxiliary device can generate a composite field in the laser cladding stage to achieve the convection of molten metal in the cladding process, the metal composition is refined, and the pores and cracks in the cladding layer are reduced, thus improvingthe performance of workpiece products; finally, the device has the advantages of being simple in structure, low in control difficulty and easy to operation.

The invention discloses a device and a method capable of quickly and accurately laser cutting three-dimensional cambered-surface glass. The device comprises a support, a placing platform, a movable locating mechanism, a high-speed laser system and a control system, wherein the high-speed laser system comprises a contactor and a focusing lens; the focusing lens can receive laser and focus a focus point of the laser inside and outside the whole thickness of the three-dimensional cambered-surface glass, the opposite positions of the focusing lens and the contactor can be always kept fixed, and the contactor can always keep 90-degree perpendicularity to the surface of the three-dimensional cambered-surface glass; when the placing platform moves, the contactor can move up and down along the surface outline of the three-dimensional cambered-surface glass under the gravity action, and a peak of the contactor can be always in contact with the surface of the three-dimensional cambered-surface glass. The device disclosed by the invention has the advantages that the focus point of the laser can be always ensured to be inside and outside the whole thickness of the glass by following 3D irregular cambered surface, manual edge breaking is replaced, and energy conservation and environmental friendliness are achieved.

The invention relates to the field of machining, in particular to a side milling error compensation device based on a non-extended straight-line surface and a cutter spacing planning method of the side milling error compensation device. The side milling error compensation device comprises a clamping disc, a workpiece and a milling cutter arranged above the workpiece and used for side milling, and the workpiece is arranged on the clamping disc. The side milling error compensation device is characterized by further comprising a three-dimensional scanner, a microcomputer, a stand column and a cutter spacing compensation mechanism; the cutter spacing compensation mechanism is arranged below the clamping disc; a non-extended straight-line surface five-axis side milling cutter path is planned by adopting a four-point offset manner, whether interference exists or not is judged in real time in an online manner, online adjustment is performed according to the judging result, collision in the machining process is avoided while the machining error is reduced, and the purpose of rapid and efficient machining is achieved; and the generated cutter spacing is further optimized and completed in cooperation with the error compensation device, and the error is further lowered.

The invention discloses a mechanical cutter grinding method of a high-precision diamond Vickers pressing head, and belongs to the technical field of nano hardness measuring. From the diamond crystal obvious anisotropy and extremely high wear resistance characteristics, the mechanical cutter grinding method is adopted to machine a rectangular pyramid diamond Vickers pressing head. Through the grinding process experiment of the rectangular pyramid diamond Vickers pressing head, the rule of the influence of the diamond abrasive grain, the grinding pressure, the grinding disc rotating speed, the reciprocated motion stroke, the reciprocated motion frequency and other process parameters on the tip-end finely rounded radius, the edge finely rounded radius and the tip end transverse blade can be analyzed in detail, and the optimal diamond Vickers pressing head grinding process is built. In order to break through the abroad technical barrier and improve the manufacturing process level of the national diamond Vickers pressing head, the exploratory advance is achieved.

The invention discloses a processing technology of a robot RV speed reducer needle gear shell, and belongs to the technical field of robot RV speed reducer processing. The processing technology includes the steps that precise casting or forging is carried out on a needle gear shell blank; the needle gear shell blank is clamped after the surface of the needle gear shell blank is machined, and the rotation center of the needle gear shell blank is taken as a positioning reference; the end face of the needle gear shell blank, a bearing position of a roller pin bearing and bearing positions of two main bearings are machined; finish machining is carried out on the inner surface of the roller pin bearing according to the positioning reference; finish machining is carried out on a roller pin groove in line contact with a roller pin of the roller pin bearing according to the positioning reference; inner grooves are simultaneously machined in the bearing positions of the two main bearings in a finish machining mode according to the positioning reference; finish machining is carried out on the outer surface of the needle gear blank. The needle gear shell machined according to the steps improves machining precision and the parallelism degree of the bearing positions of the main bearings, guarantees coaxiality, the position degree and cylindricity of the main bearings after installation, achieves one-time clamping, can meet requirements of multiple process parameters, improves machining precision and installation precision of the needle gear shell, reduces accumulated errors, meets the high-precision requirements, and prolongs service life.

The invention discloses a spring energy storage hydraulic operation mechanism and an energy storage spring unit. The energy storage spring unit comprises an upper press plate, a lower press plate, and an energy storage spring installed between the upper press plate and the lower press plate in an abutting mode, wherein the upper press plate and the lower press plate are arranged on a cylinder block of a working cylinder in a sleeved mode, the energy storage spring is formed by spiral compression springs which are arranged into an array between the upper press plate and the lower press plate in an abutting mode, and the center line of the spiral compression spring array coincides with the axis of the cylinder block of the working cylinder. On one hand, the machining error of a single spiral compression spring is small, a linear relationship is formed between output force and displacement, performance is stable, the influence of environment temperature is avoided in normal use, and therefore the energy storage spring unit is an ideal energy storage element; on the other hand, the multiple spiral compression springs are arranged in parallel, the slope of the characteristic curve of a single spiral compression spring can be reduced exponentially, ideal output characteristics can be obtained through reasonable design, the effect that large output force is obtained through small displacement is achieved, and the more the springs are, the smaller the length error of the spring assembly is and the higher the output precision is.

The invention provides a timber discharging machine with a tailing dragging function and belongs to the technical field of machines. The technical problem that a last section of tailing material is seriously wasted when an existing discharging sawing machine is used for cutting a batten is solved. The timber discharging machine comprises a rack. A horizontal worktable is arranged on the rack. An electric saw is arranged on the rack. A first horizontal guide rail is further fixed to the rack. A first sliding block is connected to the first horizontal guide rail in a sliding manner. The rack is provided with a first driving source used for driving the first sliding block to move along the first horizontal guide rail. A first clamping claw is fixed to the first sliding block. A second horizontal guide rail is further fixed to the rack. A second sliding block is connected to the second horizontal guide rail in a sliding manner. The rack is provided with a second driving source used for driving the second sliding block to move along the second horizontal guide rail. A second clamping claw is fixed to the second sliding block. The first clamping claw and the second clamping claw are located on the two sides of the electric saw correspondingly and can clamp the same piece of timber at the same time. According to the timber discharging machine with the tailing material dragging function, the waste of the tailing material of the timber can be reduced, and the utilization rate of the last section of tailing material of the timber is increased when the batten is cut.

The invention discloses an auxiliary supporting device, system and method for thin-walled barrel piece machining. Machining deformation of a thin-walled barrel piece is reduced, vibration during machining is reduced, machining errors are decreased, and the machining precision is improved; and the problem that a common single-layer airbag is not suitable for supporting a thin-walled barrel piece ofwhich the surface is uneven is solved. The structure is simple, disassembling and assembling are convenient, and the auxiliary supporting device can be closely attached to the surface of the thin-walled barrel piece in a supporting mode. According to the technical scheme, an inner layer airbag and an outer layer airbag which are sleeved together are included, a plurality of air inlet valves and air outlet valves are installed between the inner layer airbag and the outer layer airbag, and under control of the air inlet valves, the inner layer airbag and the outer layer airbag expand in sequence so that the to-be-machined thin-walled barrel piece can be supported.

The invention belongs to the technical field of the processing of the bearing ring and provides a method for grinding and positioning the inner ring of a third-generation wheel hub bearing. An electromagnetic centerless clamping tool is used as a tool for processing the inner ring (2) of the wheel hub bearing, which needs to be processed; the length of the inner cavity of an magnetic pole (1) of the electromagnetic centerless clamping tool is made to be greater than the distance from the end surface A of an step-shaped entity shaft of the inner ring (2) of the bearing to the inner end surface F of a flange plate on one end of the inner ring (2) of the bearing; the step-shaped entity shaft of the inner ring (2) of the bearing is arranged in the inner cavity of the magnetic pole (1), the inner end surface F of the flange plate on one end of the inner ring (2) of the bearing is adsorbed and clung to the end surface of an opening end of the magnetic pole (1), and the inner ring (2) of the bearing is positioned; the inner end surface F of the flange plate on one end of the inner ring (2) of the bearing is used as a processing datum surface; and the external diameter and the end surface of the inner ring (2) of the bearing are processed. The method for grinding and positioning the inner ring of the third-generation wheel hub bearing has small processing errors due to the short distance between the processed part and the magnetic pole and ensures the higher processing precision of the external diameter and the other end surface of the inner ring of the bearing.

The invention provides a machining control method for a glass engraving and milling machine. The machining control method comprises the steps of detecting boundary dimension data of cutters located in the detection area through an optical detection system, then obtaining the abrasion loss X of the cutters and controlling a main shaft to move for feed compensation according to the abrasion loss X of the cutters; controlling and enabling the main shaft to rotate, detecting the deflection values of the cutters at different rotation speeds and judging whether to carry out machining or grab the cutters again. According to the invention, the cutters for glass engraving and milling can be automatically detected, the main shaft can be controlled to move for feed compensation according to the actual abrasion loss, the machining errors can be reduced, and the machining quality can be improved; deflection of the cutters at different rotation speeds can be automatically detected for judging whether to carry out machining, and therefore the yield of product machining can be improved, and the loss can be lowered.