276results about How to "Avoid machining errors" patented technology

The invention discloses a water-based cutting fluid used in slice machining of a hard brittle crystal material, comprising the following compositions: base oil, organic amine, organic acid, synthetic ester, emulsifier, rust and corrosion inhibitor, dispersion flocculation and hard-water resisting agent, antiseptic bactericide, antifoaming agent, coupling agent, adjuvant and a proper amount of water. Aiming at the machining techniques of inner circle slicing and outer circle slicing, the water-based cutting fluid has good generality, lubricity, strong antirust property and a long service life; when the cutting fluid is used, the machining situation can be observed easily, the cooling property is good, the cleaning and the permeability are strong, cuttings subside easily, and the machining problems of machining error, crack and the like caused by cutter blocking, abrasion and the like are solved; according to the invention, the problems that cuttings are easy to adhere and suspend, a cutter is seriously abraded, a machined product cracks easily, the accuracy is not high, the machining efficiency is low, the later period cleaning is complex and the like existing in the current slice machining of the hard brittle crystal material are solved, and further, a machine bed is protected, and the cost is reduced.

The invention relates to a compensation method of the radius of a tool for a triaxial numerical control machine tool based on curve surface reconstruction, which generates a tool path based on a cutting plane, namely plans the tool path on a group of parallel planes, and then generates numerical control processing program with compensation parameters by post processing; the compensation method comprises the detailed steps: analyzing a G01 code in the numerical control processing program, extracting all tool location points, realizing the fast reconstruction of processing curved surfaces of the tool location points, respectively calculating unit normal vector of each tool location point on the curved surfaces of the tool location points, saving the unit normal vector of each tool location point in the G01 code of the tool location point as tool radius compensation vector, and constructing an extended G01 code; when the tool radius changes, calculating a cutting contact point coordinate by the tool location point and radius compensation vector in the extended G01 code, generating new tool location points according to the changed tool radius, and realizing real-time compensation of the tool radius in the triaxial numerical control processing process; and the compensation method solves the problem that the tool can not be compensated by online due to loss of geometric information of processing curve surfaces.

The invention discloses a transparent broadband metamaterial absorber which comprises multiple periodically arranged unit structures. Each of the unit structures comprises an upper layer transparent resonant structure at the center of the unit structure, a middle layer transparent substrate, and a lower layer transparent reflection layer. The upper layer transparent resonant structure is above the middle transparent substrate, and the lower layer transparent reflection layer is under the middle layer transparent substrate. The upper layer transparent resonant structure is a symmetric figure which comprises a ring and a ring with a branch at the periphery of the ring. Both the upper layer transparent resonant structure and the lower layer transparent reflection layer are transparent conductive materials. According to the transparent broadband metamaterial absorber, the reflection rate of incident electromagnetic wave can be effectively attenuated in an X band, the transparent broadband metamaterial absorber is convenient to manufacture, the technology is mature, the light transmittance performance of the overall structure is excellent and a light transmittance rate is larger than or equal to 80% in a visible light range, and the transparent broadband metamaterial absorber has a good prospect in application.

The invention discloses a fixed frequency beam scanning leaky-wave antenna and a beam scanning method thereof. The antenna comprises a dielectric substrate, a metal strip and a metal floorboard positioned on front and back surfaces of the dielectric substrate, and a plurality of variable capacitance diode positioned on the front surface of the dielectric substrate, wherein the metal strip comprises a set of arc-shaped gradient microstrip structures and an artificial surface plasmon structure positioned between the gradient microstrip structures; the artificial surface plasmon structure comprises transition sections connected with the gradient microstrip structures and a plurality of groove units with periodically changed groove depth positioned between the transition sections; and the metal strip is connected with the metal floorboard via the variable capacitance diode and through holes. According to the antenna and the beam scanning method thereof provided by the invention, modulation on average surface impedance is achieved by adjusting the capacitance value of the variable capacitance diode, and fixed frequency beam scanning can be achieved along with the change of voltage; in addition, the antenna is simple to manufacture, convenient to operate and prone to integrate; and only a photoetching step is needed, so that cost is saved, machining errors caused by a multi-layer structure are avoided.

The invention discloses a self-adaptive compensation method for detecting the turning error of a large part of a rotary body, comprising the steps of: rough machining the part of the rotary body; measuring the radius of intersection of two adjacent contour line segments on an axial section of an inner hole of the part of the rotary body and en extent of error delta 1 of the radius of the two end points by a probe, performing semifinishing for the rough machined part of the rotary body, performing semifinishing for the semifinishing lathe tool by machining trajectory intersection and two end points with theoretical machining radius which is X1-delta 1 / 2, measuring the actual radiuses of the intersection (A) and two end points (A1) in the step 2) after semifinishing to obtain an extent of error delta1' of semifinishing; performing finish machining, wherein that finish machining lathe tool, the main shaft rotary speed of the tool and the feeding speed are identical to those of semifinishing. In the process of finish machining, a numerical control system of the lathe compensates the extent of error delta 1' of semifinishing. The invention solves the problem that in the machining process the machining error caused by tool wear exists, thereby greatly improving the machining precision of the large part of the rotary body.

The invention discloses a nanofluid minimum quantity lubrication experimental system and method for ultrasonic vibration auxiliary grinding. The system comprises a magnetism worktable, a workpiece clamp, a measuring cell and an ultrasonic vibration device; the ultrasonic vibration device comprises a tangential ultrasonic vibration device, an axial ultrasonic vibration device, a vibrating base and radial piezoelectric ceramic pieces fixed on the vibrating base; the tangential ultrasonic vibration device and the axial ultrasonic vibration device are respectively fixed on the vibrating base and meanwhile, are respectively fixed on the magnetism worktable by supports, the measuring cell is fixed on the vibrating base and the workpiece clamp is fixed on the measuring cell. The nanofluid minimum quantity lubrication experimental system and method for ultrasonic vibration auxiliary grinding have the advantages that simultaneous online detection of a grinding force and a grinding temperature are realized, time is saved, and the machining errors caused by assembling for multiple times are also avoided.

The invention provides a fourth-axis rotary indexing processing device for a special processing center of a valve body. The fourth-axis rotary indexing processing device comprises a rotary motor. An installation base is arranged on the rotary motor. An installation vertical plate is arranged perpendicular to the installation base. A centering component, a clamping component and a first correctingcomponent are arranged on the installation vertical plate. The device further comprises an auxiliary mechanism arranged on the installation vertical plate. The auxiliary support is carried out by utilizing a first support ejector rod and a second support ejector rod. An operator can lift the valve body to the installation vertical plate through a hoisting machine and then pre-lock the valve body by centering the valve body through the centering assembly, and meanwhile in cooperation with the work of the clamping component and the first correcting component, the complete locking of the valve body is automatically realized in the process of correcting the levelness of the valve body, so that the technical problem of automatic installation of the valve body is solved, the manpower is reduced,meanwhile accurate installation and locking of the valve body are realized, and the processing precision is improved.

The invention discloses a clamping device for mold production, which includes a box body, and is characterized in that: a first motor is fixedly connected to the bottom of the inner wall of the box, and a first bevel gear is sheathed on the surface of the output shaft of the first motor , the bottom of the inner wall of the box is rotatably connected to a first rotating rod and a second rotating rod through a support rod, and both ends of the first rotating rod are respectively rotatably connected to the front and back of the inner wall of the box through bearings, and the second Both ends of the rotating rod are respectively connected to the front and back of the inner wall of the box through bearings. The surface of the first rotating rod is sequentially sleeved with a second bevel gear, a first gear and a second gear from back to front. The invention relates to the field of mold technology. The clamping device for mold production achieves the purpose of automatically taking out the workpiece raised by the workbench, avoids the problem that it is difficult to take out the mold after reprocessing, ensures the processing efficiency, and facilitates the processing of the workpiece by the operator.

The invention discloses a full-automatic drilling machine. A multi-axis device is arranged and a plurality of drill bits are mounted on the multi-axis device according to a drilling requirement, so that the simultaneous processing of multiple sets of drilling mechanisms is realized, the working efficiency is increased and the processing production cost is lowered. A workpiece is positioned on a rotatable index plate in a clamped way and two sets of drilling mechanisms are corresponding to two spaced areas on the index plate, so that the workpiece in a relative central position during a processing process is ensured and the stability at the drilling moment is ensured. The index plate is rotatable, and after one side of the workpiece is processed, the index plate is rotated for 90 degrees under the driving of a transmission mechanism and the other side of the workpiece is processed, so that the workpiece is not detached, the processing time is saved, the workload is reduced and the working efficiency is increased. A limiting mechanism is arranged, so that the position of the workpiece is effectively limited, the adjusting precision is higher, the fixed central position of the workpiece is ensured, the processing error is avoided and the product quality is increased.

The invention provides a micro-hole electric discharge and electrolytic combined machining multi-channel symmetrical flushing device and a micro-hole electric discharge and electrolytic combined machining multi-channel symmetrical flushing method, and belongs to the technical field of electromachining. The device comprises a tool electrode, a clamping and guiding device, a diversion device and a solution sealing device; during electric discharge machining, a working solution flows from the inside of the tool electrode into a machining area at a high speed, the electric discharge perforation machining is realized; during electrolytic machining, the working solution flows into the machining area along the outer wall of the tool electrode through the diversion device, and electrolytic reaming machining is realized. Two flushing methods of the working solution are realized, and requirements of electric discharge machining and electrolytic machining on a flow field are respectively met, the two machining methods can be realized under the condition of the same machine tool, the same station and the same tool electrode, errors caused by frequently changing tool clamps can be avoided, the operation is simplified, and the machining efficiency and quality are improved. In addition, the solution sealing device and the diversion device are used for realizing small-gap large-flow flushing, the stability of the flow field is ensured and the hole forming effect is improved.

The invention relates to a positioning method for machining a workpiece and an automatic clamp thereof, wherein the positioning method comprises the following steps: A) selecting a reference surface of the workpiece; B) setting a reference plate, wherein the shape of the surface of the reference plate, which corresponds to the workpiece is in fit with the shape of the reference surface of the workpiece; C) setting a limiting block which is used for limiting the degree of freedom of the workpiece in the corresponding direction; and D) using a movable positioning block to push and press the workpiece to enable the workpiece to abut against the reference plate and form the surface contact. The automatic clamp mainly comprises the reference plate, a limiting part, a supporting part, the movable positioning block and a power system thereof. The automatic clamp for the positioning method can be used for positioning the workpieces in complex shapes or multi-position machining, the clamping is firm and reliable, and the problems of machining errors and the like caused by the deformation of the workpieces can be further avoided.

The invention discloses a laser cladding device and method based on ultrasonic-Lorentz force composite vibration, which solves the problems of insufficient vibration capacity and many bubbles in the cladding layer in the prior art, and achieves effective cladding layer cracks , The effect of suppressing and reducing air bubbles, the scheme is as follows: the clamping chuck is used to support the cladding substrate; the first conductive head is set opposite to the clamping chuck, and is used to apply a current field to the cladding substrate from the end ; The second conductive head is set on the machine bed, and is used to apply a current field to the cladding substrate from below; the laser head is set on the top of the machine bed, and is used to cladding the cladding substrate from above; The coil includes two magnetically conductive cores, which are respectively arranged on both sides of the laser head, and each magnetically conductive core is wound with a helical coil; an angle adjustment mechanism for an ultrasonic generator; the ultrasonic generator is supported by an angle adjustment mechanism for an ultrasonic generator , which is used to apply an ultrasonic field to the cladding substrate at a set angle.

The invention discloses a single-layered broadband random surface. The random surface comprises a dielectric substrate (2), a windmill metal patch 1 basic unit (1) and a metal floor (3), wherein the windmill metal patch 1 basic unit (1) and the metal floor (3) are respectively coated on the upper surface and lower surface of the dielectric substrate (2); the metal floor (3) is used for preventing electromagnetic wave transmission; the basic unit (1) is formed by using a single-layered double-resonance unit with a randomly distributed size, and composed of a regular square ring located in the center of the unit and a branch-containing square ring located at the periphery of the regular square ring. The random surface disclosed by the invention can be used for effectively reducing the RCS (radar cross-section) of a two-dimensional metal target body in an X waveband; the random surface is simple in manufacturing and easy to operate; the random surface has absolute advantages in comparison with previous multilayer modes, so that the random surface has extremely high application prospect in practice.

The invention discloses a method and a device for forming a vertical through hole in a semiconductor, which belong to the field of special machining. Based on a micro electromachining theory, the method uses a micro electrode array as a tool electrode and a semiconductor material (usually silicon, germanium, gallium arsenide, sapphire, silicon carbide and the like in sheet with a resistivity of less than 10 omega.cm) as a workpiece to process the vertical through hole(with a diameter phi of less than 50 mum and a depth to width ratio of less than 10) in the semiconductor by the processes of micro spark discharge, micro electrochemical finishing and side wall passivation sequentially. The device for implementing the method is provided with a device capable of continuously completing the processes of the micro spark discharge, the micro electrochemical finishing and the side wall passivation on one set of equipment for ensuring process integrity and positioning accuracy and is additionally provided with a shock wave generator capable of producing a shock wave effect for facilitating the machining of the through hole with a large depth to width ratio in the semiconductor. The technical method and the device have the characteristics of no relation with material crystal direction, vertical side wall, small heat affected zone, high machining precision, excellent technical flexibility and the like.

The invention relates to a four-ridge horn antenna and a processing method. The four-ridge horn antenna comprises a horn main body, four ridge pieces, a probe and a short-circuit board, wherein the four ridge pieces are sequentially, uniformly and circumferentially arranged on an inner cavity of the horn main body at interval, the four ridge pieces and the horn main body are of an integral forming structure, a tail part of the horn main body is connected with the probe, the probe penetrates through the horn main body in a radial direction, and the tail part of the horn main body is connected with the short-circuit board. In the four-ridge horn antenna proposed by the antenna, the four ridge pieces and the horn main body are of the integral forming structure, the four-ridge horn antenna is simple in structure, is good in quality and high in accuracy, and has favorable antenna electrical property, a processing and assembly error is effectively avoided, and the four-ridge horn antenna is applicable to application development demands of a millimeter-wave horn antenna for high performance and high reliability.

The invention discloses an automatic compensating method of a gear clamping eccentric error of gear grinding of a numerical control (NC) formed grinding wheel. On an X-axis of a numerical control machine, a detection head of a touch sensor is arranged towards one side of a gear, the touch sensor is sequentially connected with an joint plate, an NC system, and a terminal control console at the back side, and the NC system is connected to each operation control part of a machine tool through a servo system. The apparatus is implemented by the following steps of: step 1, carrying out eccentricity detection; and step 2, regulating eccentricity, sending a command to the machine tool through the servo system by the NC system, and horizontally moving the grinding wheel through a Y-axis of the machine tool to enable the symmetric line of the axial section to be overlapped with the symmetric line of a gear groove and enable the grinding wheel to be fed along the radial direction of the gear until the axial section of the grinding wheel shaft is completely coincided with the radial section of the gear groove, and then, finishing the process. The method provided by the invention is simple in steps and high in regulation efficiency.

The invention relates to the technical field of lens processing, and in particular to an optical lens grinding machine. The optical lens grinding machine comprises a machine frame, wherein a transmission frame is mounted on a bottom plate of the machine frame; a supporting column is vertically mounted on the transmission frame; the bottom end of the supporting column is mounted on the bottom plateof the machine frame through a bearing; a sucker is mounted at the top end of the supporting column; the supporting column adopts a hollow structure; an air suction pipe is arranged in an inner cavity of the supporting column; an air suction pump is mounted on the transmission frame; an air guiding pipe is mounted at the air suction end of the air suction pump; the bottom end of the air suction pipe is connected with the air guiding pipe; a driven wheel is mounted on the supporting column; a transmission motor is mounted on the bottom plate of the machine frame; a transmission rotating shaftis mounted at the driving end of the transmission motor; and a transmission wheel is mounted at the top end of the transmission rotating shaft, and is connected with the driven wheel through a transmission belt. According to the optical lens grinding machine disclosed by the application, flank grinding operation and mirror polishing operation are synchronously performed, so that the effect of single-station multi-angle processing is achieved.

The invention discloses a lathe for processing an external thread of a screw which can avoid that the screw is bent when being processed. The lathe for processing the external thread of the screw provided by the invention comprises a lathe base, a chuck and a tail bed which are arranged on the lathe base as well as an external thread cutting die, wherein the external thread cutting die is clamped onto the chunk and is coaxial with a workpiece, the clamping part of the tail bed is provided with a standstill locking structure, and the workpiece is arranged on the tail bed and can axially move relative to a shaft of the lathe base. The external thread cutting die is used for processing the screw, thus the workpiece only receives torque and no radial force during processing, no bending moment capable of causing the screw to be bent is produced, cutter relieving phenomenon on the workpiece can not be produced, and external thread accuracy of a finished product screw is guaranteed.

The invention provides a suspension arm welding and positioning device and method. The welding and positioning device comprises a tail part positioning unit and a barrel positioning unit, wherein the tail part positioning unit comprises two tail part positioning parts; distance between the two tail part positioning parts is adjustable; a tail positioning and clamping space is formed between the two tail part positioning parts; the barrel positioning unit comprises two clamping plates, wherein distance between the two clamping plates is adjustable; and a barrel positioning and clamping space is formed between the two clamping plates. Because the tail part of the suspension arm is subjected to metal working and the tail part of the suspension arm and the barrel of the suspension arm are both positioned, the whole suspension arm does not need to be ruled after welding is finished. Therefore, a processing error due to ruling is avoided, the processing precision is improved, and potential safety hazards due to rotation during ruling are avoided.

The invention provides automatic drill bit grinding equipment and belongs to the technical field of drill bit machining. The automatic drill bit grinding equipment solves the problems of how to achieve automatic production of micro-drill machining and improve the machining precision and the production efficiency. The automatic drill bit grinding equipment comprises a machine table, wherein a rotary multi-station machining module is positioned in the middle of the machine table; four working heads are rotationally arranged on the rotary multi-station machining module; a feeding and dischargingmodule, a grooving station module, a tip grinding station module and a back grinding station module are sequentially arranged on the machine table in the counter-clockwise direction around the rotarymulti-station machining module; a grooving station adjusting seat is correspondingly arranged on the inner side of the grooving station module; a tip grinding station adjusting seat is correspondinglyarranged on the inner side of the tip grinding station module; and a back grinding station adjusting seat is correspondingly arranged on the inner side of the back grinding station module. Accordingto the automatic drill bit grinding equipment, automatic production of a drill bit is completed through the procedures of feeding, grooving, tip grinding, back grinding and discharging, the proceduresare coherently connected, the production efficiency is greatly improved, the machining precision is high, the operation is stable, the adjustability is high, and the product quality is improved.

The invention relates to the technical field of abrasive and grinding tool equipment, and discloses an abrasive grinding tool convenient to polish. The abrasive grinding tool comprises a supporting plate, a guide groove is formed in one side of the top of the supporting plate, and a guide block is slidably connected with the guide groove, one end of the guide block penetrates through and extends to the outside of the guide groove and is fixedly connected with the bottom of a motor base, the top of the motor base is fixedly provided with a driving motor, one end of the output shaft of the driving motor is connected with a coupler in a clamped mode, a transmission shaft is connected with one end, far away from the driving motor, of the coupler in a clamped mode; and a grinding wheel piece isfixedly connected with one end, far away from the coupler, of the transmission shaft. The abrasive grinding tool convenient to polish is characterized in that the guide block, the driving motor and the grinding wheel piece are cooperated to use, so that mechanical parts can be machined by translation of the driving motor; and the situation that the machining error occurs due to the fact that handshakes during hand-held machining is avoided, the machining quality of the mechanical parts is improved, and the rejection rate is reduced.

The invention relates to a mould-closing mechanism of a plastic injection molding machine. The mould-closing mechanism mainly comprises a fixed mould plate, a moving mould plate, a pull rod, a back mould plate, a toggle mechanism, a mould-closing cylinder, a mould-adjusting device, mould-locking cylinders and a locking device, wherein the number of the mould-locking cylinders is four; each mould-locking cylinder is mainly composed of a mould-locking cylinder barrel, a mould-locking cylinder piston and a mould-locking cylinder piston rod; each mould-locking cylinder piston rod is a part of the pull rod; the mould-locking cylinder barrels are fixed on the fixed mould plate; and the four mould-locking cylinders are connected through channels. By adopting the mould-closing mechanism of the invention, the defects of the existing three-plate toggle type mould-closing mechanism and two-plate direct pressure type mould-closing mechanism can be overcome, the advantages can be fully absorbed when the mould is moved and locked; the mould-closing mechanism has excellent characteristics, simple structure and stable and reliable performance and can meet the demands of various types of injection molding machines; and the mould-closing mechanism is suitable for new products and can be used in the improvement of the existing three-plate toggle type injection molding machine.

The invention discloses a general method for machining the complex curved surface of a non-spherical cutter in the multi-axis-linkage CNC manner. The method comprises the steps of (1) designing the curved-surface generating motion of a cutter relative to a workpiece: firstly, the curved surface of the cutter is described based on a vector function having continuous third-order partial derivatives, and then an envelope surface equation formula for the curved surface of the cutter is obtained with boundary conditions taken into consideration; secondly, a motion optimization functional extremum model formula of the cutter relative to the workpiece and having a minimum machining error, and a motion optimization functional extremum model formula of the cutter relative to the workpiece and having a maximum machining line width are obtained; finally, the above functional extremum model formulas are solved to respectively obtain a motion of the cutter relative to the workpiece at a given machining line width and a minimum curved-surface machining error, and a motion of the cutter relative to the workpiece at a maximum machining line width and a given limit error; (2) realizing the curved-surface generating motion of the cutter relative to the workpiece on a specific machine tool. According to the technical scheme of the invention, the machining accuracy and the machining efficiency of the curved surface are improved through fully developing the machining potential of the multi-axis-linkage CNC.

The invention discloses a floating type two-dimensional double-piston pump which comprises a pump. An oil suction opening and an oil drain opening are formed in the pump, a pump unit is arranged in the pump and comprises two cylinders, the two cylinders are fixed into the pump and are arranged in the left-right directions, and two pistons are arranged in the two cylinders and are in linkage with each other; the central axes of the cylinders coincide with the central axes of the pistons, movement components are arranged at two ends of each piston and are used for driving the piston to axially move to change the volume of a working chamber, and piston movement driving directions of the corresponding movement components at the two ends of each piston are opposite to each other; each cylinder,the corresponding piston and the corresponding movement components on two sides of the piston form a portion of the floating type two-dimensional double-piston pump, an upper portion of the floatingtype two-dimensional double-piston pump is close to a front end cover, and a lower portion of the floating type two-dimensional double-piston pump is close to a rear end cover. The floating type two-dimensional double-piston pump has the advantages that oil distribution disc structures of the traditional peripheral plunger pumps are replaced with rotary and slide double-degree-of-freedom structures of the pistons, and accordingly the floating type two-dimensional double-piston pump has continuous oil suction and drain functions; the floating type two-dimensional double-piston pump is in doublemodes, reciprocating movement is carried out by 4 times whenever each piston rotates by a circle, and oil can be sucked and drained by 16 times and are increased by 4 times as compared with single-piston pumps.

The invention provides a threading clamp for producing nonstandard bolts and threaded rods. The clamp comprises a clamp installation handle used for connecting to a machine tool thimble, a sleeve fixed at the end part of the clamp installation handle, a telescopic sleeve connected with the sleeve axially and slidably, a tap fixing sleeve connected to the telescopic sleeve, and a tap connected with the tap fixing sleeve, wherein the clamp installation handle, the sleeve, the telescopic sleeve, the tap fixing sleeve and the tap are coaxial. The clamp has an automatic telescopic position adjustment structure, is more convenient for processing threads, has more reliable processing precision, reduces programming time of a lather, avoids processing errors caused by artificial factors and machine tool precision of manual (automatic) processing of ordinary lathes, and saves more processing time.

The invention relates to a batch-type grinding method of a hard coating material, comprising the following steps: carrying out alternate batch-type grinding by adopting a grinding wheel feeding way and a grinding wheel no-feeding way in the grinding process; when the grinding wheel feeding way is adopted, carrying out high-speed or ultra high-speed grinding; when the grinding wheel no-feeding wayis adopted, carrying out no-load reciprocatory grinding; and after every time of feed grinding of a grinding wheel, carrying out the no-load reciprocatory grinding for 2-20 times according to the actual condition; wherein the high-speed or ultra high-speed grinding comprises that the primary feed grinding depth is 10-15mu m, the feeding speed of an operating platform is 6000-30000mm / min, and the linear speed of the grinding wheel is 80-200m / s. In the invention, variation of the actual grinding depth caused by elastic deformation and heat deformation of the grinding wheel and workpieces can beeliminated to the utmost extent, the heat produced at high-speed grinding can be timely released, and the grinding wheel can maintain to be sharp, thus the material removing rate is improved, the grinding surface burning is effectively reduced, the grinding wheel loss and production cost are greatly reduced, and the good processing quality is obtained.

The invention provides a fixture for machining annular parts and a method for machining the parts through the fixture. The fixture comprises a supporting base provided with a boss on the top. The boss is provided with three supporting columns, and the lengths of the three supporting columns are sequentially reduced. A pressing plate is installed on the top of the supporting column II. The pressing plate is pressed on the top of the supporting column II through a pressing block installed on the supporting column I. The bottom of one end of the pressing plate and the top of the supporting column III are matched to clamp the parts to be machined. The position of the pressing plate is adjusted through cooperation of the three supporting columns, and the pressing plate and the supporting column III are matched to press the parts to be machined, so multiple fixtures can be matched to clamp some annular parts inconvenient to fix, the fixture can be adjusted to adapt to parts in different sizes, machining errors caused by elastic deformation generated due to clamping and radial fixing when the annular parts are fixed are avoided, and machining precision of the annular parts is improved.

The invention discloses a bearing capable of detecting motion. The bearing comprise a bearing body, a magnetic sensor and a magnetic ring with multiple poles, wherein the bearing body comprises an inner ring, an outer ring and a rolling element; the magnetic ring is fixedly arranged at the upper end surface of the inner ring; the magnetic sensor is fixed on the outer ring through a pressing cover; a step hole of which the upper end is big and the lower end is small penetrates through the end surface of the pressing cover; a through hole is radially formed in the side wall of the pressing cover; the through hole penetrates through a small hole part of the lower end of the step hole and extends to the inner wall of the pressing cover; the magnetic sensor is arranged on the step surface of the step hole in an inverted manner and the sensing surface of the magnetic sensor is arranged opposite to the magnetized surface of the magnetic ring at an interval through the through hole; an insulating material is filled above the magnetic sensor, so that the magnetic sensor is firmly bonded in the step hole; the pressing cover is detachably arranged at the upper end surface of the outer ring. The bearing capable of detecting motion disclosed by the invention is small in assembly error, long in service life and capable of outputting two-channel rectangular wave which has a duty factor of 50% and a phase difference of 90 DEG, so that the detecting accuracy is improved.

This invention is a small compression impellor manufacturing method. First, big excircle, big end face and hole are processed through small end excircle is clamped and is relied on advection road plane. Secondly, big excircle is clamped by three claws and big end face is done to plane to process meridian plane and small end face, all procedures are finished. The consistency of small end excircle and passage is fully used in the first processing to make position reference coincide design reference, so the processing error brought from non coincidence of reference in traditional technique is effectively avoided, and the passing percent is raised to more than 97%. The advantages are simple technology, low cost and high production efficiency.