55results about How to "Guaranteed concentricity requirements" patented technology

The invention belongs to aerospace product machining technology equipment and particularly discloses a positioning support device for stir friction welding of a storage box cylinder section circular seam. A central shaft disk is arranged above a rotating base seat, a support ring is arranged in the center of the central shaft disk, a top ring is arranged above the central shaft disk, a connecting disk is arranged above the central support ring, long support rods are arranged outside the connecting disk, a short support rod is connected with the rear end of each long support rod, and internal threaded holes are arranged in two ends of left end and right end of a double-stud structure of an adjusting sleeve and respectively connected with the long support rods and the short support rods; the rotating base seat is a perpendicular long positioning rod and a pressing rod, and a pressing plate is arranged above the pressing rod; and a perpendicular short positioning rod is installed between the short support rods and the rotating base seat. Due to the cyclic structure which is formed by the long support rods and the short support rods is adopted, products on a cylinder section can be positioned and supported, positioning error is effectively reduced, and tolerance requirements of welding can be met, and at the same time, parameters in the welding process are stable, internal stress and deformation are small, and positioning support device is further favorable for preventing weldments from being pierced through by a stirring needle.

The invention discloses an anti-adhesive shoulder fixture for improving the efficiency of an endurance test, which aims to provide a novel test fixture structure to improve the efficiency of the endurance test, prevent the adhesion and the tripping between a specimen and a fixture and between the fixture and a pull rod of a testing machine, and ensure the authenticity and the reliability of the test. The technical scheme of the anti-adhesive shoulder fixture has the following key points that: the fixture adopts a shoulder type structure to prevent the adhesion and the tripping between the specimen and the fixture and the adhesion and the tripping between the fixture and the pull rod of the testing machine; a shoulder type serial connector is designed, and two specimens are connected in series and are synchronously tested on one testing machine so as to improve test efficiency; a shoulder large pull head adopts K002 high-temperature alloy, and the shoulder fixture and the shoulder type serial connector adopt directional high-temperature alloy DZ22 or single crystal high-temperature alloy DD3 to improve the applicable test temperature of the fixture to 1200 DEG C; and the fixture has simple operation and quick and convenient clamping, ensures the concentricity, and is applicable to different models of endurance testing machines produced by different testing machine manufacturers.

The processing method for a dual power outlet case of an engine is like this: fastening the flywheel cover to the special flywheel clippers, locating the rear casing and the flywheel housing through the locating pin, then, using the screw fastening the rear case on the end face of the flywheel housing through connecting holes. It solves the difficulty of clamping of rear cases with accurate location, complete same with the using status. With one time clamping, one time processing, it ensures the concentricity requirement of the side outlet gearbox gear shaft or bearing holes, with stable teething, low rotating noise and long durability.

The invention discloses a deformed cylindrical section straightening device which comprises a frame, two correction components and a control system, wherein the two correction components are in the mirror symmetry, and each correction component comprises a guiding frame and a driving cylinder; one end of each guiding frame is hinged on the frame; the surface facing to a corrected deformed cylindrical section, of each guiding frame, is an arc surface matched with the excircle of the deformed cylindrical section; one end of each driving cylinder is hinged with the frame, and the other end of the driving cylinder is hinged with one side far away from the corrected cylinder joint, of the guiding frame; and the control system is electrically connected with the driving cylinders respectively. The deformed cylindrical section straightening device has simple, reasonable and compact structure, overcomes many disadvantages of the prior art and realizes the mechanical adjustment of the roundness of the deformed cylindrical section; and by adopting the deformed cylindrical section straightening device, the degree of automation of the equipment and the adjustment precision of the roundness of the cylinder joint can be increased, the working efficiency of correction can be increased, and wastes can be reduced.

The invention discloses a welding system and a welding method for all-position automatic welding of a small-diameter pipeline, and relates to the technical field of pipe welding. The welding system comprises a supporting main body with an opening, wherein a rotating disc and a clamp holder base are arranged on the supporting main body, and the rotating disc can rotate on the supporting main body; a welding gun is further arranged on the rotating disc; and a rapid clamping device is arranged on the clamp holder base and comprises clamping positioning angle blocks and clamping rotating blocks which are oppositely arranged around the rotating circle center of the rotating disc, and the clamping positioning angle blocks and the clamping rotating blocks can move relative to each other. The welding system can effectively meet the requirements of factory sites and other pipeline systems with small pipe diameters, high pipeline concentration, multiple pipeline turning points, multiple crossed positions and narrow construction space, and welding equipment is small in size and convenient to assemble and disassemble.

The invention discloses a manufacture process of a robot RV reducer spline eccentric shaft. The manufacture process comprises the following steps: forging a shaft blank; drilling a central tip hole in each of two end faces of the shaft blank, and milling a positioning groove in the circumference of a spline end; finish machining two cams close to the bearing positions of taper-roller bearings and finish machining two end faces of the bearing position simultaneously by adopting the two central tip holes as the positioning reference; finish grinding two end parts of the spline eccentric shaft and the bearing positions of the two taper-roller bearings by adopting the two central tip holes as the positioning reference; finish grinding the circumferential surfaces of the two cams by adopting the two central tip holes as the positioning reference; taking the two central tip holes as the reference, taking the phase difference of the two cams as a starting point to enable the phase difference of the two cams to be 180 degrees; performing gear hobbing and gear grinding on a spline by adopting the positioning groove as the reference. With adoption of the manufacture process, the processing error and the assembling error can be reduced to meet the assembling requirement of a high-precision RV reducer.

The invention relates to an adjustable step drill bit which comprises a large drill bit body, an adjustment screw, a small drill bit body and a sleeve. The whole large drill bit body is of a cylindrical structure, and a circular through hole is formed in the center of the large drill bit body and longitudinally penetrates through the whole large drill bit body; meanwhile, an unthreaded hole and a threaded hole are transversely formed in the two opposite ends of the middle of the large drill bit body respectively. A conical surface is arranged at one end of the large drill bit body, and a cutting edge of the large drill bit body is arranged at the other end of the large drill bit body. The small drill bit body is located in the circular through hole of the large drill bit body and can vertically move in the whole circular through hole. Through holes same in size are transversely and evenly formed in the small drill bit body in parallel. The sleeve is installed on the outer surface of the small drill bit body in a sleeved mode. Kidney-shaped holes are formed in the two opposite ends of the sleeve. A lug hole is formed in one end of the sleeve. The adjustment screw penetrates through the unthreaded hole, the corresponding through hole, the kidney-shaped holes and the threaded hole to enable the large drill bit body, the small drill bit body and the sleeve to be fastened together. According to the adjustable step drill bit, the drilling diameter and the drilling depth can both be changed, and the concentricity of a step hole can be effectively guaranteed.

The invention discloses a welding method for a central nozzle flange and a nozzle corrugated pipe body of a 300MW-level gas turbine, and relates to a corrugated pipe body welding method. The welding method aims to solve the problems that a corrugated pipe is compressed in the existing brazing assembly process, so that non-uniform rebound force is formed by the corrugated pipe, and a nozzle is seriously eccentric; and in a nozzle body laser welding structure, a base material is a thin-wall part, uneven and rapid heat input causes stress to be generated in the material, and welding deformation is particularly serious. The welding method comprises the steps that S1, a swirler is welded; S2, a nozzle swirler assembly welding positioning tool is installed; S3, brazing filler metal is added; S4,positioning and pressing are carried out; S5, the coaxiality is checked; S6, welding and fixing are carried out; S7, vacuum brazing is carried out, specifically, a gas turbine nozzle assembly fixed in the sixth step is fed into a vacuum heat treatment furnace to be subjected to vacuum brazing. The welding method can used for welding the corrugated pipe body.

The invention discloses a once-forming extruding machine for a tubular axle blank of a heavy truck and belongs to the field of equipment manufacturing. The machine comprises a rack, left and right horizontal thrust oil cylinders, left and right extrusion forming dies, a clamping oil cylinder and upper and lower clamping dies. The rack is of a T-shaped steel-structure framework; the left and right horizontal thrust oil cylinders are mounted at the left and right ends of the rack respectively; and the left and right extrusion forming dies are connected with piston rods of the left and right horizontal thrust oil cylinders respectively. The clamping oil cylinder is vertically mounted at the upper end of the middle part of the rack; the upper clamping die is connected with the piston rod of the clamping oil cylinder; and the upper clamping die is connected with the rack through a guide sleeve of a guide rod. The lower clamping die is mounted at the lower part of the rack. Sliders are arranged between the horizontal thrust oil cylinders and the extrusion forming dies; and the sliders are connected with the rack through a sliding guide rail and a wheel-type guide rail. The once-forming extruding machine disclosed by the invention has the advantages that the axle blank has high strength, the manufacturing processes of the axle blank are reduced, the production rate is improved, the blank material is easily prepared and can adopt a round pipe, and the material is saved.

The invention provides a fully-automatic grinder, belongs to the technical field of machinery, and solves the problem that an existing grinder is large in floor area. The fully-automatic grinder comprises a frame, the frame is divided into a conveying area and a machining area sequentially from front to back, an incoming mechanism and a feeding mechanism are arranged in the conveying area, a spindle box and a discharging mechanism are arranged in the machining area, the discharging mechanism and the incoming mechanism are arranged on two sides of the spindle box respectively, the feeding mechanism is arranged over the incoming mechanism and capable of linearly reciprocating between the incoming mechanism and the spindle box, a floating chuck is mounted on the spindle box, and an ejection seat is further arranged on the frame and located right ahead the spindle box. The fully-automatic grinder has the advantages of small floor area and high automation degree.

The invention relates to a method for manufacturing a 300 MW stage heavy fuel machine nozzle swirler assembly, solves the problem of low production efficiency of an existing method for manufacturing a300 MW stage heavy fuel machine nozzle swirler assembly, and belongs to the technical field of heavy fuel machine manufacturing. The method comprises the following steps that 1, three tools are manufactured, the assembly welding sequence of each part is determined, one end of a first tool with a large radius and a second tool are used to assemble a swirler and a front joint, the swirler is coaxial with and makes contact with the front joint, and simultaneously the swirler and an outer ring are assembled, and contact positions of the swirler and the front joint are welded; 2, the swirler is overturned, one end of the first tool with a small radius is used to make coaxially contact with a corrugated assembly with the swirler, and welding is performed; 3, a rear joint sleeves the end of thefirst tool with the small radius and penetrates through the corrugated pipe assembly, the rear joint is coaxial with the swirler by using a third tool, and contact positions of the rear joint and theswirler are welded; 4, the outer ring and a front ring are welded to the swirler; and 5, a welding positioning fixture is removed after the welding is completed.

The invention relates to a concentricity calibrating device for assembling of an azimuth compass repeater. The concentricity calibrating device is characterized in that the concentricity calibrating device comprises a first calibrating unit, a second calibrating unit and an optical azimuth instrument. The first calibrating unit is used for calibrating the concentricity between the scale center of a board angle circle and a central hole of a positioning block, the second calibrating unit is used for calibrating the concentricity between the rotating axis and the scale center of a dial, and the optical azimuth instrument is used for calibrating the concentricity between the scale center of the board angle circle and the scale center of the dial. According to the concentricity calibrating device for assembling of the azimuth compass repeater, the problems that in the manufacturing process of the azimuth compass repeater, the machining cost is high due to the fact that four-center superposition needs to be ensured, and four-center superposition precision cannot be guaranteed due to the fact that the fit clearance of a transmission mechanism is hard to control precisely are solved.

The invention discloses a vehicle clutch cover pressing side cutting and center hole punching composite die which comprises an upper die frame plate, a lower die frame plate and a discharging plate. The lower end face of an upper die cushion plate is connected with a hole punching protruding die. A lower die cushion plate is provided with a hole punching concave die which is placed below the hole punching protruding die and is matched with the hole punching protruding die when the hole punching protruding die is pressed down. The discharging plate is connected to the hole punching protruding die in a sleeved mode. The discharging plate is connected with the upper die frame plate through a spring. A side cutting protruding die which is placed below the discharging plate and is matched with a side cutting concave die insert is connected to the outside of the hole punching concave die in a sleeved mode. The vehicle clutch cover pressing side cutting and center hole punching composite die has the advantages that the two procedures of cover side cutting and center hole punching are completed in a concentrating mode, so that a machining cycle is greatly shortened, production efficiency is improved, half-finished product turnover is lowered, and the labor intensity of workers is lowered; and the accuracy and the concentricity of products can be guaranteed, and then product quality is improved.

The invention relates to a converter trunnion ring and a method for accurately positioning and installing a converter shell. The method accurately determines the position of a supporting point of the converter trunnion ring, adopts a combined mounting bracket to reduce the center of gravity of equipment, improves the stability of the mounting process, ensures the positioning accuracy, and adopts a supporting point positioning pin to accurately position the converter trunnion ring on a trunnion ring bracket, and the central position of a converter mouth is adjusted by using the central line of a converter, so that the positioning precision of an oxygen lance opening and the oxygen lance center of a vaporization flue is improved. According to the method of the invention, excessive deviation of a positioning pin hole of a converter trunnion ring bearing pedestal is avoided, and the key technical problem in accurate positioning and mounting of the converter trunnion ring and the converter shell is effectively solved.

The invention discloses a novel multistage centrifugal pump, and belongs to the technical field of fluid pumps. The centrifugal pump comprises a pump body, and the pump body is internally provided with a transmission shaft in a rotating mode. The pump body comprises an intake segment, a middle segment and an output segment, and the middle segment is arranged between the intake segment and the output segment. The transmission shaft is fixedly provided with a plurality of impellers, and the middle segment is provided with guide vanes corresponding to the impellers. An intake sealing mechanism is arranged between the intake segment and the transmission shaft, and an output sealing mechanism is arranged between the output segment and the transmission shaft. An air filter plate is arranged between the intake segment and the first-stage impeller. The air filter plate is fixedly arranged on the pump body and provided with a plurality of through holes. The output segment is fixedly connected with a compensation shell. The transmission shaft penetrates out of the compensation shell. A compensation sealing mechanism for preventing liquid from leaking is arranged between the compensation shell and the transmission shell. By means of the novel multistage centrifugal pump, the technical problems that an existing multistage centrifugal pump is poor in sealing performance and low in output efficiency, and air bind is formed easily are solved, and the novel multistage centrifugal pump is widely applied to continuous conveying of fluid.

The invention discloses a piston type accumulator comprising a cylinder block, an oil-side end cover, a gas-side end cover, a piston, a central casing pipe and a displacement sensor; the oil-side endcover and the gas-side end cover are arranged on the cylinder block, and the piston is located in the cylinder block; the central casing pipe is connected among the center of the oil-side end cover, the center of the piston and the center of the gas-side end cover in sequence; the displacement sensor is located in the central casing pipe. By adopting the central casing pipe, on one hand, the concentricity requirements in the working process of the piston are met, and on the other hand the displacement sensor can be protected; and the piston type accumulator facilitates replacement of the displacement sensor. According to the piston type accumulator stated in the invention, the structure and functions of a conventional piston accumulator can be reserved, and the piston displacement monitoring can be achieved; the structure is simple and stable, and the service life is long; and the requirements that the field working conditions of the piston displacement need to be monitored are met.

The invention discloses a multi-section forming reamer for processing an automobile valve sleeve. A left peripheral blade and a right peripheral blade are sequentially arranged on a knife body; a guide column is arranged between the left peripheral blade and the right peripheral blade; a left knife rotating slot with left helixes is formed in the left peripheral blade; a right knife rotating slotwith right helixes is formed in the right peripheral blade; an internal cold hole which is formed along a center axis is formed inside the knife body; one end, towards the head part of the knife body,of the internal cold hole is sealed; and the head of the knife body is provided with a forming chamfer angle. The multi-section forming reamer for processing the automobile valve sleeve provided by the invention, a left-helix design is adopted for discharging chips downwards, and a right-helix design is adopted for upwards discharging chips, so that a phenomenon that scrap iron cannot be discharged as a chip discharge slot is too long is avoided; a guide column is additionally arranged to raise a supporting column, so that hole precision is improved; a forming chamfer design is adopted, chamfering for connecting a R angle to a transition angle is made after conventional chamfering, so that roughness of hole walls can be improved in a cutting process; and the left knife rotating slot adopts front punching and side cooling, and a right knife rotating slot adopts back punching and side cooling, so that a chip discharge direction is met, chip removal and cutting edge cooling are facilitated better, and therefore, cooling effect is improved.

The invention relates to a hot upsetting die seat of a press. The hot upsetting die seat comprises a knock-out rod (1), an upper die plate (3), an upper fixed seat (5), an upper safety nut (7), a lower safety nut (8), a lower fixed seat (10), an ejector sleeve (11), a lower die plate (12), a die handle (2) and a cushion plate A (4), wherein the upper fixed seat (5) is fixedly fastened on the upper die plate (3), and the lower fixed seat (10) is fixed on the lower die plate (12). The hot upsetting die seat is characterized in that the knock-out rod (1) is arranged in the die handle (2), a guide sleeve (6) is arranged in the upper fixed seat (5), and the upper safety nut (7) is in threaded connection with the upper fixed seat (5); the ejector sleeve (11) is arranged in the lower die plate (12), and an ejector rod (13) is arranged in the ejector sleeve (11); a lower cushion sleeve (14) is arranged on the upper side of the ejector sleeve (11), and a fixing sleeve (9) is arranged in the lower fixed seat (10); a die is arranged in each of the upper fixed seat (5) and the lower fixed seat (10). The hot upsetting die seat has high accuracy, and is simple, convenient, safe and practical.

The invention discloses a full-manual dual-seal butterfly valve of a movable sealing device independent of a valve body. The full-manual dual-seal butterfly valve comprises a movable sealing ring, the valve body and a valve plate, wherein the movable sealing ring is arranged on a screw rod, and is connected with a butterfly valve upstream connecting pipe through the screw rod; an adjusting nut capable of manually mounting and manually relieving the movable sealing ring is arranged on the screw rod; the movable sealing ring is connected with the valve body through a flange bolt. According to the full-manual dual-seal butterfly valve of the movable sealing device independent of the valve body, the overhauling sealing device is independent of the butterfly valve body, so that free valving and disassembly transportation of the butterfly valve body can be realized, meanwhile, when the sealing of the butterfly valve is damaged or aged and needs to be overhauled and replaced, the adjusting nut on the screw rod is manually operated through operating the movable sealing ring, so the inputting and the relieving of the overhauling sealing ring are realized; a locking function of the overhauling sealing ring is realized, the overhauling sealing ring of the butterfly valve is reliable to act, and the overhauling work of work sealing is safer.