65results about How to "Guaranteed parallelism" patented technology

The invention discloses a GPGPU (General Purpose Graphics Processing Unit)-based singular value decomposition acceleration method and equipment, belongs to the technical field of computer technologies, and is used for solving the problems that when an SVD (Singular Value Decomposition) technology is applied to hardware, a relatively large calculation amount and a large amount of memory occupation can be caused, and different index strategies influence the parallel operation efficiency of the hardware, so that the hardware performance is poor. And the overall performance of hardware is reduced. The method comprises the steps of obtaining an index sequence of a to-be-decomposed matrix; generating a plurality of groups of index sequence pairs based on the index sequence; sending a kernel function kernel to the GPGPU, and traversing each group of index sequence pairs through each block in the kernel function kernel; decomposing matrix data corresponding to the first group of index sequences in the to-be-decomposed matrix through the queue in each block to obtain a first decomposed matrix; and decomposing matrix data corresponding to the second group of index sequences in the first decomposition matrix to obtain a second decomposition matrix, and so on until the last group of decomposition matrix is obtained, thereby obtaining a singular value decomposition result.

The utility model discloses a fisheye flat gasket stamping die which is characterized in that a fisheye extruding station, a punching station, a blanking station and a guide pin mounting station are correspondingly arranged on a concave die plate, a lower base plate and a lower die plate at the lower end part of the die; the female die plate is further provided with a conical rod mounting station and a guide punching rod avoiding station. And a fisheye extruding mounting station, a punching mounting station and a blanking mounting station which are respectively arranged corresponding to the fisheye extruding station, the punching station and the blanking station are arranged on a stripping template and an upper fixing plate at the lower end part of the die. The stripping template is further provided with a conical rod avoiding station, a guide pin avoiding station and a guide punching rod installing station which correspond to the conical rod installing station, the guide pin installing station and the guide punching rod avoiding station respectively. The punching die is high in punching efficiency, the material utilization rate can be remarkably increased, the high precision of the surface parallelism and planeness of the fisheye flat gasket can be guaranteed, and the punching die can be produced in a large scale.

The machining method comprises the following procedures that OP10, a workpiece is fixed to a first tool clamp, the workpiece is in a circular ring shape and is provided with an outer circular face, an inner circular face, a first side end face and a second side end face, the first side end face and the second side end face are located between the outer circular face and the inner circular face and are oppositely arranged, and the outer circular face serves as a clamping face; the first side end face serves as a positioning face, the workpiece is clamped, the second side end face is subjected to rough turning and finish turning, and the inner circle face is subjected to rough turning and finish turning; and OP20, the workpiece is fixed to a second tool clamp, the machined inner circle face serves as an expanding face, the machined second side end face serves as a positioning face, the workpiece is expanded, rough turning and finish turning are conducted on the first side end face, rough turning and finish turning are conducted on the outer circle face, and rough turning and finish turning are conducted on the spigot face. The problems that an annular workpiece is prone to deformation and manual clamping is not in place are solved, and the technical requirements for the parallelism of the two end faces of a product, the coaxiality of the inner circle and the outer circle, the perpendicularity of the end faces and an inner hole / outer circle and the like are met.

The invention relates to a universal mandrel groove grinding device, in particular to a universal mandrel adjustable groove grinding device and a groove grinding method, and aims at solving the technical problems that when an existing clamp is used for grinding sliding grooves of a universal mandrel, it is difficult to guarantee that the included angle between the groove and the central axis of the mandrel meets the technical requirement, indexing of the three sliding grooves is inaccurate, and the repeated positioning precision is low. The device comprises a wedge-shaped bottom plate, and a first clamping mechanism, an indexing mechanism, a supporting mechanism and a second clamping mechanism which are arranged on the wedge-shaped bottom plate, the first clamping mechanism and the second clamping mechanism are used for positioning the universal mandrel to be subjected to groove grinding from the two ends in the axial direction correspondingly. The supporting mechanism is used for supporting and fixing a universal mandrel of a to-be-ground groove; the indexing mechanism comprises a tooth aligning pin seat, a tooth aligning pin and an indexing ring; the tooth aligning pin is mounted on the tooth aligning pin seat, and positioning teeth are arranged at the top of the tooth aligning pin; a plurality of jackscrews are arranged on the indexing ring; a positioning groove is formed in the peripheral surface of the indexing ring; and the positioning teeth are matched with the positioning grooves so as to realize circumferential positioning of the universal mandrel to be subjected to groove grinding.

The mixed type double-layer spiral reaction chamber comprises a first reaction chamber and a second reaction chamber which are sequentially arranged in the sample injection direction, and the first reaction chamber comprises a first double-layer spiral pipe composed of a first spiral pipe and a second spiral pipe which are arranged in a winding mode; the second reaction chamber comprises a second double-layer spiral pipe consisting of a third spiral pipe and a fourth spiral pipe which are wound with each other; the first spiral tube is detachably connected with the third spiral tube, and the second spiral tube is detachably connected with the fourth spiral tube, so that second channels for detecting the peroxide concentration in the sample are respectively formed. Different from an existing double-channel detector, the hybrid double-layer spiral reaction chamber provided by the invention has the advantages that the common part of the two channels is increased to the maximum extent through the double spiral channels, the sensitivity of equipment is improved, the use of parts and the volume and weight of the equipment are reduced, and the portability and the real-time detection sensitivity of the equipment are improved.

The invention discloses a thin stainless steel plate fin type heat dissipation core body machining method. The method comprises the steps of heat dissipation core body brazing structure design, heat dissipation core body part preparation, heat dissipation core body assembly, heat dissipation core body test welding, heat dissipation core body brazing parameter correction and formal brazing implementation, multiple heat dissipation core body connection and heat dissipation core body hot shape correction. According to the difference between the length or the width and the height of the heat dissipation core body, the thin stainless steel plate fin type heat dissipation core body can be divided into two, three and even more heat dissipation core bodies with the reduced height, so that the stability of the heat dissipation core bodies in the brazing process is guaranteed, and the heat dissipation core bodies are connected in series according to the weldability characteristic. Connection can be conducted in a fusion welding mode, a brazing mode and the like, the brazing parameters of the single heat dissipation core body are corrected when brazing is conducted, deformation is controlled in cooperation with a brazing clamp, and finally hot shape correction stress removal and brazing repair are conducted. The problems of brazing collapse, heat dissipation core deformation, low sealing qualification rate and the like in the machining process of the thin stainless steel plate fin type heat dissipation core are solved.

The utility model belongs to heat exchanger technical field, concretely relates to a heat exchanger double tube plate welding structural member. Heat exchanger double tube plate welding structural member includes: the tube side tube plate is provided with the boss at the right end part of the tube side board tube, is provided with the boss ring main part at the left end part of the shell side tube plate, is provided with the boss ring step at the left end part of the boss ring main part, the right end surface of the boss is with the left end surface of the boss ring main part coaxial contact, the inner side surface of the boss ring step is with the outer side surface of the boss adapts, the outer side surface of the boss ring step and the outer side surface of the boss are the welding position.

This utility model discloses a packaging mold for a suspended guide coil, relating to the field of mold packaging technology. The device includes a material carrier plate; the material carrier plate has a material-carrying cavity inside, and the top and bottom of the material-carrying cavity are respectively provided with a first mounting limiting groove and a second mounting limiting groove. The first and second mounting limiting grooves are respectively fitted with a first molding component and a second molding component, which support the top and bottom coils. A lead wire support assembly is provided below the bottom coil. The packaging mold for the suspended guide coil of this utility model, through the mutual cooperation of various structures / components in the lead wire support assembly, ensures the parallelism of the three lead wires during the packaging process, effectively avoiding deformation under external force and improving the packaging accuracy of the coil.

The utility model discloses a kind of inner measuring micrometer measuring surface parallelism assembly device, one side of its base is equipped with lock frame, the other side of the base of lock frame rear side is equipped with vertical plate, and left tight force screw and right tight force screw are equipped on vertical plate and are opposite;Lock frame clamps the scale sleeve of inner measuring micrometer to make the left measuring claw I and right measuring claw I of inner measuring micrometer be between left tight force screw and right tight force screw, and the top of each measuring claw is equipped with stick hole, and left measuring stick and right measuring stick are equipped with through clamp parallel clamping corresponding to left and right stick hole;Adjusting each tight force screw side portion of corresponding measuring claw is pressed to eliminate the fit gap between measuring screw and threaded shaft sleeve of inner measuring micrometer;Lower fixture and left measuring stick and right measuring stick are inserted in left and right stick hole, and each stick hole is removed clamp after firmly measuring stick is bonded with glue.Using the utility model, it is guaranteed that the parallelism of measuring surface generatrix when inner measuring micrometer is used meets the requirement of national standard.

The utility model relates to laser cutting equipment technical field, concretely relates to a synchronous telescopic load platform. The utility model provides a synchronous telescopic load platform, including base, the slide rail mechanism of setting in the both sides of base and with the support mechanism of slide rail mechanism connection, the slide rail mechanism includes the horizontal setting guide rail, the fixed slide block of being fixed in the one end of guide rail and with the mobile slide block of guide rail sliding connection, the bottom of fixed slide block and mobile slide block passes through telescopic connecting rod and constitutes articulated structure, the support plate that the support mechanism includes the support strip of being located fixed slide block and mobile slide block on and being fixed on support strip. This load platform passes through the support structure design of synchronous telescopic, solves the problem that the spacing of traditional load platform support plate is not adjustable, the replacement of replacement tooling is complicated and the waste material is difficult to discharge, improves the processing flexibility and efficiency of laser cutting equipment.

The invention relates to the technical field of numerical control machine tools, and provides a gantry double-drive synchronous machine tool and a lead screw assembling method.The gantry double-drive synchronous machine tool comprises a machine tool body component, a cross beam assembly and a lead screw, the machine tool body component comprises a machine tool body, two guide rails and two support assemblies, the two guide rails are arranged at the two ends of the machine tool body in parallel, and the two support assemblies are located on the outer sides of the two guide rails respectively; each support assembly comprises a front support and a rear support which are arranged in the extending direction of the guide rail. The two ends of the cross beam assembly are arranged on the two guide rails in a sliding mode, the cross beam assembly comprises a cross beam and nut bases located at the two ends of the cross beam, the cross beam and the nut bases are integrally formed, and nut base holes are formed in the nut bases; the lead screw is arranged in the nut seat hole in a penetrating mode, and the two ends of the lead screw are rotationally connected with the front support and the rear support respectively. The cross beam and the nut bases on the two sides of the cross beam are integrated into a whole part, the assembling precision is improved, the coaxiality of the two nut bases and the corresponding front and rear supports is adjusted at the same time through the two testing rods, and the assembling and adjusting efficiency is improved.

The invention provides a technology capable of easily maintaining a driving mechanism and the like for lifting a lifting pin in a substrate heat treatment device. A substrate heat treatment apparatus (1) is provided with: a heat plate (20) for heat-treating a substrate (9); a substrate raising and lowering mechanism (30) that raises and lowers the substrate (9) above the heat plate (20); a main body frame (11) for supporting the hot plate (20) and the substrate lifting mechanism (30); and a pair of sliding members (15) capable of integrally pulling out the heat plate (20) and the substrate lifting mechanism (30) from a processing position (P1) on the inner side of the main body frame (11) to a maintenance position (P2). The substrate lifting mechanism (30) is provided with: a plurality of lifting pins (31); a frame member (35) that supports the plurality of lifting pins (31); a motor (37) located outside the frame member (35) in plan view; and a power transmission mechanism (38) for transmitting the power of the motor (37) and raising and lowering the frame member (35).

The utility model discloses railway turnout switching equipment and a turnout hook-shaped external locking device thereof, which belong to the technical field of rail transit, and the turnout hook-shaped external locking device comprises a switch rail connecting iron component, a push-pull plate component, a connecting iron seat component and a lock hook, the push-pull plate assembly is connected with the switch rail connecting iron assembly and the connecting iron base assembly. The switch rail connecting iron assembly is connected with the connecting iron seat assembly; and the lock hook is connected with the connecting iron seat assembly. The turnout hook-type external locking device is simple in structure, convenient to install, reasonable in design, small in abrasion between parts, long in replacement period, small in later maintenance workload, high in adaptability to extension and retraction of a switch rail, beneficial to keeping parallelism between the external locking parts, capable of reducing frictional resistance during turnout switching, capable of improving reliability of turnout switching, and capable of being used for improving the reliability of turnout switching. And the workload of turnout maintenance is reduced.

The utility model discloses a coil orientation forming die which comprises a forming cavity used for forming a magnetic sheet, the forming cavity is formed by splicing an upper die base and a lower die base, an upper die coil is wound on the upper die base in the circumferential direction, a lower die coil is wound on the lower die base in the circumferential direction, and the winding direction of the upper die coil is the same as that of the lower die coil. An ejector pin is movably connected into the lower die base, the end face, close to the upper die base, of the ejector pin is used for being spliced into the lower end face of the forming cavity, the ejector pin is made of magnetic steel, and the upper die base and the lower die base are made of non-magnetic steel. The coil orientation forming die provided by the utility model ensures the parallelism of an orientation magnetic field and is low in cost.

The utility model relates to large-diameter external-penetrating eddy current flaw detection equipment which comprises a bottom plate, the lifting mechanism comprises a lifting rod slidably arranged on the bottom plate in the vertical direction and an adjusting hand wheel arranged on the lower surface of the bottom plate; the detection mechanism is arranged above the bottom plate, the detection mechanism comprises an external penetration detection probe, and the external penetration detection probe comprises a detection coil; the conveying mechanism comprises a plurality of conveying wheels which are arranged on the side close to the workpiece inlet end of the detection mechanism and the side close to the workpiece outlet end of the detection mechanism respectively, the conveying wheels are rotationally arranged on the upper surface of the bottom plate, and each conveying wheel comprises two circular truncated cone parts which are coaxially connected in an abutting mode; the projections of the end faces, abutting against each other, of the two circular truncated cone parts on the separated end faces of the two circular truncated cone parts completely fall into the separated end faces of the two circular truncated cone parts. According to the utility model, the relative position of the axis of the detected workpiece and the axis of the detection coil can be conveniently adjusted through the lifting mechanism.

The present invention discloses a printing plate device for a curved screen printing machine, comprising a slider connecting plate, a fixed rod, a fixed block, a support block, a connecting rod, an adjustment block, a plate alignment adjustment rod, a screw, an adjustment sleeve, a retaining ring, a connecting block, a connecting bracket, a height adjustment rod, an angle adjustment rod, a screen printing plate pad, a screen printing plate, a pad connecting rod, a pad fixing nut and a front and rear adjustment rod. The present invention achieves the adaptation between the screen printing plate and different substrates by arranging a height adjustment rod, an angle adjustment rod, a plate alignment adjustment rod and a front and rear adjustment rod on the printing plate device, thereby ensuring the parallelism between the screen printing plate and the substrate surface and the rebound amount of the screen printing plate, reducing the production cost, improving the working efficiency of the automatic screen printing machine, and improving the adaptability of the printing plate device.

The tool for detecting and adjusting the parallelism of the washboard of the cigarette making machine comprises a detection block, the lower end of the detection block is detachably installed at the end of the washboard, an arc face matched with a cigarette bearing groove in a twisting and connecting drum wheel is manufactured on the edge of the upper end board of the detection block, and the parallelism of the washboard is judged by judging whether the arc face is matched with the arc face of the cigarette bearing groove or not. And the parallelism of the washboard is adjusted on the premise that the arc surface is matched with the arc surface of the cigarette bearing groove. According to the utility model, the original structure of the washboard is utilized, and the detection block of which the upper end plate edge is the arc surface matched with the cigarette bearing groove is arranged at the position for mounting the starting rail on the washboard, so that a basis is provided for parallelism detection and position adjustment of the washboard, and the problems of time and labor waste and poor consistency of manual adjustment of the washboard depending on experience are solved; the device is simple in structure, reasonable in design and convenient to disassemble and assemble, the parallelism detection and adjustment efficiency of the washboard is improved on the premise that the original structure of the washboard is not changed, and the use value is high.

The utility model discloses a wall slotting device for electroosmosis anode installation, which relates to the technical field of wall slotting devices and comprises a track frame, a movable table slidably arranged on the track frame, a vertical rod fixedly arranged on the movable table, a sliding sleeve slidably arranged on the vertical rod, and an installation plate slidably arranged on one side of the sliding sleeve in the front-back direction. According to the grooving machine, the transverse movement track of the grooving cutter can be limited through movement of the movable table, the movement track of the grooving cutter in the vertical direction can be limited through movement of the sliding sleeve on the vertical rod, and therefore the grooving cutter can be conveniently and rapidly cut. The straightness of the groove bodies in the cutting process, the parallelism between the transverse groove bodies and the perpendicularity between the vertical groove bodies and the transverse groove bodies are guaranteed, and the grooving precision of the wire groove is improved.

The application belongs to the technical field of steam turbine rotor processing, in particular to a drill jig for steam turbine rotor steam balance hole processing, which comprises a drill jig body, a bushing, a quick-change drill sleeve, a cylindrical pin and a set screw; the drill jig body is provided with a rectangular groove in the thickness direction; both sides of the bottom of the drill jig body are provided with through holes; the bushing is fixedly connected to the inside of one side of the through hole; the inside of the bushing is provided with the quick-change drill sleeve. The drill jig body with a "door" type structure is matched with the rectangular groove, which can quickly realize the preliminary positioning of the drill jig at the edge of the impeller, the radially limiting of the outer circle of the impeller is matched with the symmetrical distribution of the cylindrical pin, the center of the quick-change drill sleeve is accurately aligned with the positioning line, and the hole position deviation problem caused by the positioning deviation in the traditional processing is avoided; at the same time, the set screw at the bottom is stably pressed against the surface of the impeller spoke through the threaded connection, so that the drill jig can remain stable during the drilling process and prevent displacement caused by vibration.

The present invention relates to a steam turbine generator rotor end coil forming device, comprising a press forming device and a hydraulic control device, wherein the press forming device is provided with two groups, the press forming device comprises a press forming mechanism and a ring body, the press forming mechanism is provided in a group of two, and multiple groups of press forming mechanisms are evenly distributed on the ring body; the device comprises a hydraulic control mechanism, an oil inlet separator and an oil outlet separator, the oil outlet end of the hydraulic control mechanism is connected to the oil inlet separator, the oil inlet end of the hydraulic control mechanism is connected to the oil outlet separator, the oil inlet separator and the oil outlet separator are arranged on the ring body, the oil inlet separator is connected to the oil inlet end of the press forming mechanism, and the oil outlet end of the press forming mechanism is connected to the oil outlet separator; the hydraulic control device controls the press forming mechanism to press the end of the steam turbine generator rotor coil. The present invention can accurately control the forming of the rotor coil end, and has the characteristics of high precision, stable and reliable system, and high production efficiency.

The invention discloses a device and method for detecting and adjusting the parallelism between a display screen and an end face of a lens interface, and mainly relates to the field of projection display technology; the device and method include: a cylindrical shell, one end of the cylindrical shell is provided with a flange, and the flange is perpendicular to the axis of the cylindrical shell; a base, the base is installed at the end of the cylindrical shell away from the flange; a laser, the laser is installed on the base, and the base is provided with an adjustment device for adjusting the inclination of the axis of the laser; an observation plate, the observation plate is located at the end of the laser away from the base, and a light outlet adapted to the laser is provided in the middle of the observation plate, and the cylindrical shell is provided with an observation window adapted to the observation plate; a plane mirror; a U-shaped gasket, and the U-shaped gasket is adapted to the screw on the optical machine mounting column; the invention can quickly complete the correction of the lens, can ensure the parallelism between the projection chip and the lens mounting end face, and ensure the projection quality of the projector.

The utility model discloses deviation rectifying mechanism machine detection equipment which comprises a back roller assembly and a fixing plate, the back roller assembly comprises a first mounting seat and a second mounting seat, the first mounting seat is arranged on the fixing plate and comprises a first mounting plate and a second mounting plate, and the first mounting plate and the second mounting plate are arranged in a spaced mode in the Z direction; a first through hole and a second through hole are formed in the first mounting plate, a third through hole and a fourth through hole are formed in the second mounting plate, the first through hole and the third through hole are concentrically arranged, and the second through hole and the fourth through hole are concentrically arranged; the first roller and the second roller are arranged at intervals in the X direction, one end of the first roller is arranged in the first through hole, the other end of the first roller is arranged in the third through hole, and the first roller can rotate around the axis of the first roller; one end of the second roller is arranged in the second through hole, the other end of the second roller is arranged in the fourth through hole, and the second roller can rotate around the axis of the second roller.

The invention discloses a rapid lofting and positioning device for tunnel drilling and blasting hole arrangement and a drilling and blasting method, and relates to the field of tunnel construction technology.The rapid lofting and positioning device for tunnel drilling and blasting hole arrangement comprises a lifting frame, and a mounting table is arranged at the top of the lifting frame; the mounting table is provided with a projection light source and a light-transmitting template, the light-transmitting template is provided with a plurality of light-transmitting holes, the light-transmitting holes in the light-transmitting template form a light-transmitting hole system, and the light-transmitting hole system can enable light rays of the projection light source to form a light spot dot matrix for drilling and positioning on an excavation face of a tunnel. The light of the projection light source is used for forming the light spot dot matrix in a certain proportional relation with the light holes on the excavation face of the tunnel, and the lofting and hole arranging efficiency can be improved.

The mounting device includes: a bonding stage for holding a substrate on which a semiconductor chip is arranged; a base; a mounting head on which a pressing tool for pressing the semiconductor chip to the substrate is installed; and a film arrangement mechanism provided on the base for moving a coating along the bonding stage so as to arrange the coating between the semiconductor chip pressed to the substrate and the pressing tool, the film arrangement mechanism including: a film guide for guiding the coating and defining a height relative to the bonding stage; and a lifting mechanism connected to the film guide via a spring for lifting the film guide relative to the bonding stage. In the mounting device for pressing the semiconductor chip to the mounted body by interposing the coating between the pressing tool and the semiconductor chip, the parallelism between the bonding stage and the coating can be ensured.

A standard calibration frame for a crystal ingot bonding stage and a method for bonding 12-inch semiconductor crystal ingots are disclosed. The standard calibration frame includes a base that can be installed on the workpiece board station of the crystal ingot bonding stage and two calibration crossbars fixed on the base. The base is rectangular, and the two calibration crossbars are spaced apart along the length of the base. The distance from the end of any calibration crossbar to the longitudinal center line of the base is equal, and the line connecting the ends of the two calibration crossbars on the same side of the base's length direction is parallel to the length direction of the base. This invention can eliminate the influence of equipment wear and tear on the crystal ingot bonding accuracy, ensuring the quality of the final product.

The invention discloses an auxiliary tool for photovoltaic module lamination combination, and belongs to the technical field of photovoltaic panel production. Comprising an L-shaped front right-angle rod and an L-shaped rear right-angle rod which are symmetrically arranged to form a square frame structure; the left telescopic rod assembly is connected between the short side of the rear right-angle rod and the long side and the short side of the front right-angle rod. The right telescopic rod assembly is connected between the short side of the front right-angle rod and the long side of the rear right-angle rod; according to the left telescopic rod assembly, a left sliding rod is installed on the short edge of a rear right-angle rod in a sliding mode in the length direction of the short edge of the rear right-angle rod; the left sliding block is slidably installed on the long edge of the front right-angle rod in the length direction of the long edge of the front right-angle rod. The left sliding block is fixedly connected with one end of the left sliding rod close to the long side of the front right-angle rod. The front right-angle rod and the rear right-angle rod are arranged in a central symmetry mode, the left telescopic rod assembly and the right telescopic rod assembly are combined, flexible adjustment of a square frame structure is achieved, the auxiliary tool can adapt to photovoltaic assemblies of different sizes and length-width ratios, and the universality of the auxiliary tool is improved.

The utility model provides a hydraulic cushion of a hydraulic machine, which belongs to the technical field of hydraulic cushions and comprises a top cushion, the bottom of the top cushion is rotatably connected with a bottom cushion, the top of the bottom cushion is slidably provided with a leveling frame, adjacent side walls of a supporting seat and the leveling frame are provided with slopes, and a leveling transmission component is longitudinally and slidably arranged between a deformation groove and the top cushion. The leveling frame slides on the top of the bottom cushion in an attached mode through the leveling driving component, in the adjusting process, the leveling frame changes the groove widths of the deformation grooves in the two sides at the same time, the deformation groove on the narrowed side adjusts the height of the top cushion on the corresponding side through the leveling driving component, and meanwhile the deformation groove on the widened side adjusts the height of the top cushion on the other side through the leveling driving component. The levelness of the top cushion is adjusted by adjusting the two sides of the top cushion up and down, so that the levelness of the top cushion corresponds to that of the hydraulic cylinder, the direction accuracy of the hydraulic cylinder during working is ensured, and then highly accurate process control can be realized.

The invention provides a machining device and method for accurate grinding and polishing of the surface of a metal mirror surface nut part, and belongs to the technical field of accurate grinding and polishing machining of metal nut parts. The device at least comprises a double-face accurate grinding and polishing machine provided with a correction wheel, a stud auxiliary tool, a plurality of wandering star wheels and a nut part, the gears are annularly and uniformly distributed between a double-sided fine-grinding polishing machine sun gear main shaft and a double-sided fine-grinding polishing machine outer gear ring of the double-sided fine-grinding polishing machine and are meshed with each other through corresponding gears; the upper end and the lower end of the double-end stud auxiliary tool are both connected with the corresponding nut parts, wax sealing treatment is carried out, and the wax-sealed double-end stud auxiliary tool and the nut parts are integrated and arranged on the wandering star wheel. According to the method, the double-end stud auxiliary tool is designed, and wax sealing is carried out through the double-end stud auxiliary tool and the connected threaded part, so that the bonding stress generated by traditional upper disc machining is avoided, and the on-line measurement result and the disassembly measurement result are the same.

The invention relates to the technical field of motorcycle shock absorbers, and discloses a four-spring shock absorber which comprises four supporting cylinders, a telescopic rod is arranged in an inner cavity of each supporting cylinder, the lower portions of every two adjacent supporting cylinders can move in the radial direction, and the four-spring shock absorber is characterized in that damping cavities are formed between the telescopic rods and the interiors of the supporting cylinders and communicated with the inner cavities; any one of the supporting cylinders is a high-damping supporting cylinder, a damper is arranged in the high-damping supporting cylinder, and the damping device has the advantages of being low in manufacturing cost and good in damping effect.