35results about How to "Guaranteed coaxiality accuracy" patented technology

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

The invention discloses an integrated machining method of a planet carrier of a robot RV reducer, and belongs to the technical field of robot RV reducer machining. The method comprises the steps as follows: forging a first casing and a second casing, and performing hot extrusion on the first casing and the second casing respectively; performing thermal refining; performing tempering; performing finish machining on end surfaces respectively; connecting the first casing with the second casing to be clamped to a clamp, and performing finish machining on inner holes formed in the first casing and the second casing with a center of gyration serving as a locating basis; performing finish machining on outer surface with the locating basis; directly machining inner rings of rolling bearings on the first casing and the second casing; accurately grinding an outer track on each inner ring simultaneously; and performing finish machining bearing positions of three tapered roller bearings on the first casing and the second casing with the location reference, and directly machining outer rings of the tapered roller bearings. With the adoption of the method, the mounting accuracy, the manufacturing accuracy and the transmission accuracy are ensured, the requirement for high accuracy is met, the service life is prolonged, machining and assembling errors and accumulative errors are reduced, the output torque is increased, and the machining cost is effectively reduced.

The invention relates to the technical field of methods of machining parts of pressurized water reactor equipment and discloses a method of machining a travel shell of a blind-hole rod of a control rod drive mechanism in a pressurized water reactor; the outer diameter of the blind-hole rod is less than 100 mm and length-diameter ratio of the blind-hole rod is greater than 54; the method comprises the steps of (1) roughly machining rough outside of a small end of a slender rod; (2) roughly drilling a blind hole; (3) correcting segment by segment, roughly machining the outside of the small end of the slender rod to ensure the coaxiality and positionality of the blind hole and outside; (4) machining the blind hole to preset size; (5) finely turning the outside segment by segment to arrive at a positioning reference; (6) machining the outside of the small end of the slender rod segment by segment for forming purpose in order to ensure the coaxiality or positionality of the blind hole and outside; (7) machining the outside, screw thread and weld groove of the large end of the slender rod. By using the method, the problems in the technique of machining the travel shell of the blind-hole rod of a slender rod in the control rod drive mechanism in the pressurized water reactor are solved; product precision is ensured, the dimensions meet the requirements of drawings.

The invention discloses an SHPB device and method for achieving ultra-high controllable strain rate impact. The device comprises structures of a guiding rail with a T-shape groove, a light gas gun loading mechanism, a light gas gun base, a bullet, a magnetic electricity type particle velocity measuring device, a testing member, an output rod, an output rod fixing device, a strain piece, an absorbing rod, an absorbing rod fixing device, a damping device, a damping device fixing device, a data processing system and the like; the device is characterized in that the impacting on the testing memberof an incidence rod is replaced with the direct impacting on the testing member by the bullet, the particle velocity of the testing member at the incidence end is measured by the magnetic electricitytype particle velocity measuring device, the average stress, strain rate and strain of the testing member are obtained according to unidimensional stress wave assumption and uniform distribution assumption of the stress/strain of a short testing member along the length of the short testing member, and the coaxiality of the device is ensured by the T-shaped groove and bolt connection cooperative action. By means of the device and the method, controllable and ultra-high strain rate (107s<-1> scale) loading can be achieved within a larger range (104-107s<-1> scale), the debugging efficiency canbe improved, the structure is simple, and the dynamic mechanical performance of a material under the ultra-high strain rate is obtained conveniently and rapidly.

The invention discloses an automobile transmission assembly fatigue life test bench, which relates to the technical field of automobile part manufacturing. The automobile transmission assembly fatiguelife test bench comprises a speed-up box, a speed-up box output end flange, a coupling, a cylinder input end flange, a cylinder assembly and a support assembly, wherein the support assembly comprisesa support body; the support body is provided with a horizontal through hole; the horizontal through hole is internally provided with a sleeve; the sleeve is fixed in the support body through screws;the right end surface of the support body is provided with a cylindrical boss; the boss is connected with a mounting plate with a groove matched with the boss; the cylinder assembly is provided with astepped shaft; and the stepped shaft is fixed in the horizontal through hole through the bearing. The problem of a long bench debugging process at an early stage of the current automobile transmission assembly fatigue life test can be solved.

The invention discloses an aircraft engine exhaust funnel circular seam laser welding clamp and a welding method. The welding clamp comprises a main shaft structure, an adjustable support, a positioning disc structure, a positioning disc driving mechanism and a gas protection device, one end of the main shaft structure is connected with a machine tool working rotary table, the main shaft structure is driven by a machine tool to rotate, and the other end of the main shaft structure is connected with the adjustable support; the positioning disc structure is axially sleeved on the main shaft structure and is radially connected with the main shaft structure through a sliding rail and a sliding block; the positioning disc driving mechanism is installed on the main shaft structure and drives the positioning discs of different diameters on the positioning disc structure to stretch out and draw back in the radial direction; and the gas protection device is installed on the positioning disc structure and connected with the main shaft structure, inert gas protection is provided for backs of different welding seams, and an aircraft engine exhaust funnel is sleeved and positioned on the positioning disc structure for welding. Welding of an annular welding seam is achieved through rotation of the clamp and a welded workpiece, and the formed welding seam is optimal in quality and has universality.

The invention discloses a coaxial welding positioning device. The coaxial welding positioning device comprises a body, a plurality of welding holes penetrate through the middle of the body in the radial direction of the body, the two ends of the body are a main hole end and an auxiliary hole end respectively, a main hole adapting to a main welding part penetrates through the main hole end in the axial direction of the body, and an auxiliary hole adapting to an auxiliary welding part penetrates through the auxiliary hole end in the axial direction of the body. A set bolt hole penetrates through the sidewall of the main hole end in the radial direction of the body, a set bolt matched with the main welding part is assembled in the set bolt hole, a lock screw hole penetrates through the sidewall of the auxiliary hole end in the radial direction of the body, and a lock screw matched with the auxiliary welding part is assembled in the lock screw hole. The coaxial welding positioning device can effectively guarantee the coaxiality of a shaft in an online welding process and improve structural reliability of the welded shaft.

The invention belongs to the rubber machining mechanical equipment field and relates to a screw rod transmission sleeve for a single screw rod rubber extruder. An inner involute spline at the rear portion of the transmission sleeve is matched with an outer involute spline of an reduction box hollow output shaft; an inner involute spline in the middle of the transmission sleeve is matched with an outer involute spline of an screw rod tail portion shaft neck, an outer involute gear in the front of the transmission sleeve and a feeding roll gear form a feeding roll gear pair. The transmission sleeve can achieve a direct transmission on the screw rod and the feeding roll.

The invention discloses a reciprocating pump facilitating maintenance of a motor shaft auxiliary supporting sliding bearing and a sealing structure, and relates to the field of petroleum engineering equipment. The reciprocating pump specifically comprises a motor shaft auxiliary supporting seat, a sliding bearing seat, M12 screw washer sets, an elastic check ring for a hole, an inner wrapping framework rotating lip-shaped sealing ring, a sealing seat, the sliding bearing, cylinders, M16 bolts, a small sealing cover plate assembly, M12 screw holes, a positioning outer circle, a partition groove and the like. With the adoption of the structure, a gear shield and an inclined bull gear are not required to be disassembled, so that not only are the sliding bearing of an auxiliary support of a motor shaft and the inner wrapping framework rotating lip-shaped sealing ring convenient to maintain, but also the original precision of the sliding bearing and the inner wrapping framework rotating lip-shaped sealing ring is not changed after maintenance, and the service life of the sliding bearing and the service life of the inner wrapping framework rotating lip-shaped sealing ring are prolonged.

The invention provides a self-meshing coupling and a using method thereof.The self-meshing coupling comprises two half couplings connected through a universal fork head, and each half coupling comprises a meshing shaft assembly and a positioning shaft assembly; the biting shaft assembly comprises a transmission disc connected with the universal fork head, and the transmission disc is connected with a rotating shell. The transmission disc is connected with a lever shaft; cambered surface teeth are arranged in the rotary shell and are provided with arc-shaped grooves corresponding to the lever shafts; the cambered surface tooth is also connected with a swing shaft; the rotary shell is connected with a swing tooth sliding rail, a swing tooth groove corresponding to the swing shaft is formed in the swing tooth sliding rail, and the swing tooth groove is in a V shape. The positioning shaft assembly comprises a positioning shaft box body and a top cover which are connected with the swinging tooth sliding rail; six linkage gears are rotationally connected into the positioning shaft box body; every two linkage gears are meshed to form three meshed gear sets; a double-sided rack is meshed between any two adjacent meshing gear sets; and the side wall of the positioning shaft box body is connected with a top tooth screw. According to the invention, the coaxiality precision can be ensured, and quick connection can be realized.

The invention belongs to the technical field of magnetic suspension bearings, and particularly discloses an assembling tool and method for a magnetic suspension bearing rotor. The assembling tool comprises a support seat, a first oil cylinder and a second oil cylinder. The first oil cylinder is connected with a rotor assembly structure, and the second oil cylinder is connected with a sleeve pushing structure. The rotor assembly structure comprises a positioning sleeve used for assembling a rotor. A positioning cylinder which is the same as the sleeve in shape and size is arranged at the axis of the positioning sleeve. A first telescopic rod of the first oil cylinder is fixed with the positioning cylinder through a small-diameter part. The sleeve pushing structure comprises a cylindrical sleeve fixing part for pushing the sleeve to a large-diameter part, and a fixing hole matched with the sleeve in shape is formed in the axis of the sleeve fixing part. A push block capable of moving in the axial direction of the fixing hole is arranged at the outer side of the sleeve fixing part; and the push block is fixedly connected with a second telescopic rod on the second oil cylinder. There is no need of heating for rotor assembly, the process is simple and convenient, the coaxiality and the position precision of an installed rotor are high, and the stripping is convenient.