204results about How to "Reduce runout" patented technology

The invention provides a machine tool for grinding a composite workpiece under the tensioning state. The machine tool comprises a machine tool, a grinding device and a tailstock tensioning device, wherein the grinding device is arranged at one end of a carriage opposite to a knife rest in the machine tool and is connected with a feeding mechanism on the carriage; and the tailstock tensioning device is arranged on the rear of a machine tool body. The machine tool can finish turning and grinding axial workpieces, and can effectively reduce radial runout, circular degree and other form and position tolerances of the workpiece and improve the machining accuracy by adopting a clamping mode under the tensioning state.

The invention relates to an angle calibrating device and belongs to the detection field. The calibrating device for a borehole clinometer is characterized by comprising an angle encoder, a sample clamp and a corner drive mechanism, wherein the angle encoder is used as a main calibrating device, the sample clamp is used for fixedly installing the borehole clinometer to be detected, the angle encoder is horizontally arranged and connected with the sample clamp through a bearing rotating shaft base, the two sides of the bearing rotating shaft base are respectively provided with one bearing, the first bearing of one side of the bearing rotating shaft base is connected with the angle encoder, the second bearing of the other side of the bearing rotating shaft base is connected with the sample clamp, the angle encoder and the sample clamp rotate with the same rotating shaft and the same angle, and the corner drive mechanism is used for driving the angle encoder to rotate. According to the angle calibrating device, a cohesion type synchronous main shaft is adopted for connection, the coaxial precision is greatly improved, the stability and the reliability of the device are improved, value loss of output angle displacement transmitting from the corner drive mechanism to the bearing rotating shaft base is basically avoided, the calibration sensitivity is improved greatly, the configuration cost of the device is lowered, and the cost performance is greatly improved.

The invention relates to a turning positioning fixture for thin-wall rotational parts and a clamping method. The fixture comprises a cylindrical positioning body and threaded rings, wherein an external thread is lathed on the external surface of the positioning end; the threaded rings are circular rings with internal diameter the same as the external diameter of the positioning body; the internal surfaces of the threaded rings are provided with internal threads matched with the external thread on the positioning body; and during positioning, one end of the positioning body is clamped on a machine tool and the positioning end is closely contacted with the part, and the positioning body is closely matched with the part through the external thread on the external surface and the internal threads on the threaded rings. In the embodiment, the clamp force on the part is mainly axial force, thus overcoming the negative effect that radial force leads to workpiece deformation during traditional machining; and the positioning body is clamped and lathed at the site, and during positioning and clamping, firstly the positioning body is ensured to be fit with the end face of the part and the end face runout of the part is ensured to be identical with that of the spindle of the machine tool, thus ensuring the flatness and the parallelism of the part. The fixture can carry out automatic alignment and positioning while screwing the threaded rings, is convenient to operate and reduces artificial operation errors.

A heavy duty tire is vulcanized in a segmented mold having a tread molding surface defined by circumferentially arranged segments. The tread portion is molded by the tread molding surface during vulcanization of the tire, wherein the stretch of the belt layer in the tire radial direction during vulcanization is in a range of from 3.2 to 5.2%. the tread portion is provided with an axially outermost circumferential groove at an axial distance from the tire equator which distance is in a range of from 50% to 68% of one half of the tread width. The footprint shape satisfies the following conditions: (1) 1.05=<SL0/SL70=<1.18; and (2) 0.95=<SL70/SL97=<1.05, wherein SL0, SL70 and SL97 are the circumferential lengths of the footprint shape measured at axial distances of 0%, 70% and 97%, respectively, of one half of the tread width from the tire equator.

The invention provides a technique and a device for processing shaft type and pipe type workpieces in a tightened state. In the technique, the two ends of a workpiece are positioned by propping a central hole by a tip; then one end of the workpiece at a machine tool spindle end is pulled or a technical head of the workpiece at the machine tool spindle end is pulled; the tip at a back end and the other end of the workpiece or the technical head at the other end are pulled backwards under the same pulling force so as to ensure that the workpiece is in the tightened state; and therefore, the workpiece is not only positioned through the tip, but also is in the tightened state to perform outer circle processing. The device comprises a floating chuck arranged at the front end of a machine tool spindle and a tightening device arranged on the tail part of a machine tool, wherein the tightening device is also provided with the floating chuck; and the back end of the tightening device is provided with a hydraulic cylinder for a pull rod of the floating chuck. The technique and the device can ensure that the same positioning datum is adopted during multi-station processing and process the workpiece in the tightened state, so the processing rigidity of the workpiece is enhanced, the workpiece tends to elongate in the axial direction and the processing accuracy can be effectively improved.

The invention provides a clamping system for large similar cylindrical workpieces. The clamping system comprises at least two workpiece clamping devices; the workpiece clamping devices comprise first fixture bodies with semicircular structures and second fixture bodies; the first fixture bodies and the second fixture bodies are relatively connected to form a complete ring structure; and along the outer edge of the ring structure, transmission teeth engaged with external gears are arranged on the edges of the same side surfaces of the first fixture bodies and the second fixture bodies. The clamping system further comprises a bearing platform, and support bases arranged on the bearing platform in parallel; and a rotary driving device is arranged on one support base, and comprises a rotary driving mechanism and a driving gear connected with an output shaft end of the rotary driving mechanism. The invention further provides a clamping method for the large similar cylindrical workpieces. The clamping system has the advantages of safety, reliability, convenience in operation and high adaptability.

The invention discloses a high-speed jacquard shedding device, belonging to the technical field of shedding of a jacquard machine. An inner jacquard knife mechanism and an outer jacquard knife mechanism alternately move up and down by transmission of motion between each of swing mechanisms and a main transmission shaft; the main transmission shaft is synchronously equipped with four sets of eccentric wheel and connecting rod mechanisms for driving the swing mechanisms; each set of eccentric wheel and connecting rod mechanisms comprise an equal-eccentricity symmetrical connected eccentric wheel and two connecting rods; the swing mechanisms with swing arm shafts are arranged above the same lateral ends of the inner jacquard knife mechanism and the outer jacquard knife mechanism; the swing arm shafts are formed by extending in parallel along a left main wall plate and a right main wall plate; the swing arm shafts are equipped with fixed swing arms connected with ends in the same directions of an inner jacquard knife frame and an outer jacquard knife frame through lifting rods, movable swing arms, and connecting rod swing arms for driving the swing arm shafts at the two ends of the main wall plates; and the connecting rod swing arms and the movable swing arms of the swing mechanisms are connected with one connecting rod and another connecting rod in one corresponding set of eccentric wheel and connecting rod mechanism respectively. Due to the adoption of the scheme, the inner jacquard knife mechanism and the outer jacquard knife mechanism are high in motion synchronization precision and clear for shedding. The invention further provides a jacquard machine provided with such device.

An efficient down-hole hammer comprises a back joint, a check valve, an air distribution rod, a piston, a cylinder, a clamping ring, a drill head and a front joint. The check valve is a one-way valve and comprises a valve seat, a spring and a steel washer. The slotted piston is provide with a hole, a positioning sleeve is arranged at the back end of a valve end cover, and the air distribution rod, a positive vibration-proof rubber ring and a negative vibration-proof rubber ring are clamped in the positioning sleeve together. The efficient down-hole hammer is not provided with an inner cylinder structure, the air distribution mode is greatly innovated, a vibration-proof fine tuning device arranged between the back joint and the air distribution rod can effectively absorb counterforce of piston motion, the air distribution rod can be subjected to automatic fine tuning so as to keep the assembling verticality, the adaptive drill head is not provided with a tail pipe, and therefore high pressure air leakage is reduced, work efficiency is improved and production cost is reduced. In addition, the piston has a reliable service life.

The invention discloses a copper coil type manufacturing method of a commutator, comprising in turn the following steps: wire rolling, drawing, annealing, punching out, pressing, solidifying, reaming, lathing an outer periphery, channeling, sanding, and polishing etc, wherein the pressing step makes an annealed wire be pressed into an annular commutator segment assembly. The invention eliminates the original fussy sheet arranging step so that the produced commutator provides an good article roundness, which makes the dynamic unbalance of the commutator be minimized.

The invention discloses a gear grinding processing method, which comprises the following step of dividing teeth of the gear to be subjected to grinding processing into at least two continuous groups sequentially along the circumferential direction; then dividing the teeth in each group into at least two continuous subgroups sequentially; and in the grinding process, firstly grinding first subgroups in all the groups sequentially, then grinding second subgroups in all the groups sequentially, grinding all the subgroups sequentially in the manner, and repeating the operations until all teeth are ground to achieve the design standard. The gear grinding processing, which is provided by the invention, is scientific and reasonable, is beneficial to overcoming of various defects in the prior artand achieves the effect of reducing the circular runout of the gear and the circular pitch deviation.

The invention discloses a flexible sealing structure of a rotary air pre-heater. The flexible sealing structure is a contact type sealing device and comprises a sealing sliding block, a regulation supporting seat and a supporting fixing plate; the sealing sliding block is rotatablely connected with the supporting fixing plate; the supporting fixing plate is relatively arranged on a radial baffle plate of the air pre-heater fixedly; the regulation supporting seat is fixedly connected with the supporting fixing plate; a compression spring is arranged between the regulation supporting seat and the sealing sliding block; the sealing sliding block is in contact with a fan-shaped plate or an axial arc-shaped plate of the air pre-heater; a reset regulation device is arranged between the sealing sliding block and the regulation supporting seat; two ends of the reset regulation device are respectively connected with the sealing sliding block and the regulation supporting seat; and the reset regulation device is used for regulating the maximal resilience modulus of the compression spring positioned between the sealing sliding block and the regulation supporting seat. By using the flexible sealing structure, through regulating the reset regulation device, the regulation of sealing acting force between a moving component and a stationary component in the air pre-heater is realized; the wear of a sealing surface is decreased; and the service life of a quick-wear part is prolonged.

The invention discloses a deburring device applied to automobile exhaust pipes. The deburring device comprises an installation frame, a motor, an output shaft, a driving gear, an inner gear, a rotary gear and a shaping cutter, wherein the motor is arranged on the installation frame, the output shaft is connected with the motor, the driving gear is arranged on the output shaft, the inner gear is fixed to the installation frame and shares the same axis with the driving gear, the rotary gear is meshed with outer teeth of the driving gear and inner teeth of the inner gear, and the shaping cutter is coaxially connected with the rotary gear, can shape pipe openings of the exhaust pipes and can perform deburring on outer walls and inner walls of the exhaust pipes at the same time. The deburring device disclosed by the invention can shape the pipe openings of the exhaust pipes and perform deburring on the outer walls and the inner walls of the exhaust pipes at the same time, so that the pipe openings are round and neat, used time is small, and deburring efficiency is high.

The invention relates to a multi-station cold heading method of an automobile wheel cup nut, and a mold thereof. The multi-station cold heading method of the automobile wheel cup nut comprises six stations: pre-shaping, shaping, finishing, forming a flange, compositely extruding and finishing forming. A preform sequentially passes through the six stations, namely, pre-shaping, shaping, finishing,forming a flange, compositely extruding and finishing forming so as to be processed by one machine; in order to solve the problem that a molding part is easy to crack due to shear cracks since the preform is made of low-carbon steel so as to be easy to tear, the method provided by the invention adopts a six-step forming method; according to the method provided by the invention, the product dimension accuracy is improved, the product quality is high, the material utilization ratio is high, and the forming efficiency is high.

The invention discloses a WEDG device for on-line electrode manufacturing in micro electric spark machining and relates to the technical field of on-line tool electrode manufacturing in micro electric spark machining. The WEDG device aims to solve the problems that in an existing WEDG machining method, when the dimension of an electrode to be manufactured is very small, the requirements for the tension, operation speed and stability of a wire electrode are very high, the surface quality and precision of the micro electrode are affected and the dimension uniformity of the micro electrode is also affected by repeated machining. A wire electrode is conveyed out by a wire conveying mechanism of the WEDG device and conveyed into a wire collection mechanism after being machined by a machining discharging mechanism. The WEDG device is an on-line electrode manufacturing device which has the advantages that wire conveying is stable, the run-out of the wire electrode is very small at the discharging wheel position and wire conveying speed is low; the design of initiative wire supply through a stepping motor is adopted in a wire conveying module, copper wires are supplied at a constant speed, and constant tension is supplied to the copper wires in the manner that a hysteretic braking pressing wheel is pressed by a belt.

The invention discloses an intelligent sealing device for ship tail shaft numerical control magnetic fluid. According to the main structure of the intelligent sealing device, a stuffing box is arranged at the sealed part of a tail shaft, one end of the box is provided with a gland, and the other end of the box is connected with a sternpost through a flange. Two layers of PTFE ring box sleeves are arranged in the middle of the box in parallel, and nx twelve radial hedging magnetic sector permanent magnets are embedded in each layer of box sleeve. Magnetic fluid circulating cavities are formed between the box sleeves in which the magnets are embedded and a shaft tube. The two sides of each permanent magnet box sleeve are each provided with a stainless steel circular ring and provided with eight magnetic fluid injecting or discharging holes, wherein the outer sides of the two stainless steel circular rings are each provided with a stainless steel clamping ring. An AH type metal framework teflon sealing ring is clamped on a tail shaft tube. An MCU is arranged, a magnetic fluid input pump and an electromagnetic overflow valve are controlled according to the pressure and temperature sensor information, the pressure in the magnetic fluid circulating cavities and the pressure at the draft of a warship and a submarine can be randomly the same, sealing, lubricating and cooling functions are achieved on the tail shaft tube through circulation of pressurized cold and hot magnetic fluid, and an electromagnetic sealing brake is arranged for strengthening static sealing of the tail shaft tube during downtime.

The invention discloses an elastic rolling floating support for centerless grinding of an outer circle of an annular part. The elastic rolling floating support comprises elastic supporting bodies, supporting sleeves, compressed springs, transition blocks and a supporting seat; the elastic supporting bodies press the supporting sleeves through T-shaped bolts to be connected to the transition blocks, the transition blocks are connected and fixed on the supporting seat of a machine tool shell, one end of each elastic supporting body is provided with a plurality of pairs of supporting heads, alloyballs are correspondingly arranged at the end parts of the supporting heads, and the other ends of the elastic supporting bodies are fixed on the supporting seat; and a coil shell is arranged on theinner side of the supporting seat, a coil is arranged in the coil shell, a sealing body is arranged outside the coil, a magnetic pole is arranged on the outer side of the coil shell, and the magneticpole is fixed on a workpiece shaft. According to the elastic rolling floating support, non-supporting mark grinding is achieved through rolling friction between supporting points and the surface of the workpiece, and follow-up treating matters caused by support marks and even burn are greatly reduced, the influence of the elastic deformation of the workpiece on the grinding efficiency and the quality is reduced, the stress of the elastic supporting points tends to be consistent, and all the points are always in effective supporting states.

Disclosed is a novel decelerator. The novel decelerator comprises a housing, wherein two small shaft bearings are respectively arranged at two ends of a small shaft, and support the small shaft on the housing, two large shaft bearings are respectively arranged at two ends of a large shaft, and support the large shaft on the housing, key grooves are formed in stretching ends of the small shaft and the large shaft, the small shaft and the large shaft are positioned by being connected with an external motor and a work mechanism through small keys and large keys, the two ends of the small shaft and the two ends of the large shaft are sealed through small shaft covers, large shaft covers and seal rings, a gear is arranged in the middle of the small shaft and meshed with a large deceleration gear, a motor is installed at the stretching end of the small shaft, and the stretching end of the large shaft is used as an output shaft. The work mechanism is installed on the novel decelerator, and therefore radial jumping of a transmission shaft portion in a deceleration box and a transmission wheel supported by the transmission shaft portion can be effectively reduced, and furthermore the novel decelerator has the advantage of being reasonable in structure.

The invention relates to a turning clamp and turning method of a polycrystalline rod material. A left end fixing disk is a cylinder, one end of the left end fixing disk is a step shape, a blind hole is formed in the bottom end of the interior of a hole in the other end of the left end fixing disk, the upper end of the interior of the hole in the other end of the left end fixing disk is an inner conical surface, a right end fixing disk is a cylinder, one end of the right end fixing disk is a plane, and the other end of the right end fixing disk is a round protruding surface. The turning method of the polycrystalline rod material comprises the steps that a three-jaw chuck at the left end of a lathe is used for fixedly clamping the left end fixing disk with the inner conical surface, the left end fixing disk is used for fixing one side, with a conical surface, of the polycrystalline rod material in the process of machining, the end face of the other side of the polycrystalline rod material bonds with the right end fixing disk, a center of a tailstock of the lathe is used for carrying out centering abutting operation, a hard alloy tool is tightly clamped, after tool setting is accomplished, turning of the polycrystalline rod material is carried out according to preferable technological parameters which include that the cutting speed is 94m/min, the longitudinal feed ratio is 0.2, the amount of feed is 2mm and the angle of feed is 80 degrees, meanwhile, a dust removal and cooling device is started, and inspection is carried out according to the requirement for machining accuracy after turning is accomplished. The turning clamp and turning method of the polycrystalline rod material are stable in clamping, low in radial runout and high in safety, and improve machining efficiency and the product percent of pass.