43results about How to "Guaranteed center distance" patented technology

The invention relates to a rapid clamping and drilling mould for machining of a side hole of round steel. The rapid clamping and drilling mould for machining of the side hole of the round steel comprises two clamping assemblies and a positioning rod, wherein the two clamping assemblies are used for clamping the round steel, each clamping assembly comprises an upper clamping body and a lower clamping body, each upper clamping body comprises a connecting part and a clamping part, a connecting screw hole and a positioning pin hole are formed in each connecting part, an isosceles-trapezoid-shaped opening is formed in each clamping part, a through drill hole is formed in the top of each opening, and a drill jig sleeve is arranged in each drill hole; the upper clamping body and the lower clamping body of each clamping assembly are of the same structure and are combined together, the screw hole and the positioning pin hole of each upper clamping body correspond to a screw hole and a positioning pin hole of the corresponding lower clamping body, connecting bolts are arranged in the screw holes in a screwed mode, and positioning pins are inserted in the positioning pin holes; a round steel clamping cavity is formed after the upper clamping bodies and the lower clamping bodies are combined together. According to the rapid clamping and drilling mould for machining of the side hole of the round steel, the round steel is clamped in a one-time mode through the drilling mold, machining of the whole hole is achieved, drilling efficiency and drilling quality are improved, and the coaxiality of drilled holes and the distances between adjacent holes are guaranteed; deflected holes and eccentric holes are avoided, and product quality is improved.

The invention discloses a device for rapidly clamping and precisely positioning an irregular sleeve part. The device comprises a datum positioning plate, a large gasket, a screw, a double-headed screw rod, a cover plate and a nut. The part is attached to a large end face of the datum positioning plate through a boss of the datum positioning plate and the bottom of the part, thereby being precisely positioned, and the part is rapidly clamped by the large gasket, the screw, the double-headed screw rod, the cover plate and the nut. An internal machining element and an external machining element of the part are successfully clamped and turned once, so that turning of the sleeve part is greatly simplified and facilitated. By the aid of the device for turning and clamping the irregular internal sleeve, the part can be rapidly, simply and conveniently mounted on a turning machine tool, conformity of the axis of the part and the axis of a machine tool spindle is ensured, part machining efficiency is greatly improved, and the quality of the part is stable.

The invention discloses a method for processing an internal boring for a long-distance part, which comprises the following steps: clamping two bent plates provided with central holes on the front and the back side surfaces of a bored part, passing a spotting spindle through the central holes of the part and the bent plates to cause the center of the part and the centers of the bent plates to coincide, and pressing and fixing the bent plates; rounding the four main shaft of a boring lathe by using a dial test indicator after detaching the part and the spotting spindle, adjusting the four main shafts of the lathe to be coaxial with the central holes of the two bent plates, and tightly fixing the four main shafts; placing a part to be bored on the boring lathe and positioning through the bent plates, using a second spotting spindle to pass through the bent plates and the part, pressing the part tightly after positioning the part, removing the spotting spindle, and starting boring. The front hole and the back hole of a processed part are coaxial, the hole distance is consistent, the functions of the four shafts of the lathe are brought into full play, the product quality is improved, the boring time is saved, and the production efficiency is improved.

The invention relates to a split overlength shaft sleeve and bearing ring inner bore processing auxiliary device and a processing method. The processing auxiliary device comprises a V-shaped support (9), wherein the V-shaped support (9) is connected to an ash lock shell (7) which is connected with an inner oscillating bar shield (6), the inner oscillating bar shield (6) is connected with a bearing ring (5), a shaft sleeve (4) is connected to the ash lock shell, the shaft sleeve and the bearing ring are arranged on the same axes, the inner end face and the outer end face of the shaft sleeve and the end face of the bearing ring are respectively used for fixing an auxiliary supporting device (1) by using bolts, a lengthening cutter bar (2) penetrates through the auxiliary supporting device and is finally connected with a main shaft of a floor digital control boring and milling machine (3), the lengthening cutter bar is provided with a group of boring cutter installing square grooves (10), and boring cutters are arranged in the boring cutter installing square grooves. The invention is used for boring and milling inner bores with large length, big span and high requirement for concentricity.

The invention provides a crossed hole processing method, which comprises the steps that: firstly, a small hole is processed, the small holes is used for prepositioning, a step drill is adopted during large hole processing, the radius of the minor diameter of the step drill is smaller than the center distance from an outer bus of the small hole to a large hole, and when the major diameter of the step drill is cut into the small hole, the minor diameter of the step drill passes through the small hole, so the distance from the large hole center and the small hole center is ensured. The crossed hole processing method has the advantages that the center distance of the two crossed holes can be ensured, a filling shaft is omitted, the manufacture cost is saved, and the process operability is simple.

The invention provides a machining method for a rack of an electric steering gear. According to the method, the process of stress relieving tempering, natural aging, one-time clamping and combined grinding is adopted, the requirements for the tolerance of the tooth surface of each driving tooth and the tooth surface of each driven tooth being +/- 5', the OPD variation of the tooth profile of each whole driving gear and the OPD variation of the tooth profile of each whole driven gear being 0.04 mm, the linearity being 0.05 and the roughness being Ra 0.8 are met, and the requirement for the high-precision tolerance of Max0.04 is guaranteed. By means of the method, the machining efficiency is improved, and the product precision is guaranteed.

The invention discloses a foundation bolt pre-burying auxiliary welding device, and belongs to the technical field of electric auxiliary tools. The foundation bolt pre-burying auxiliary welding device comprises a bottom plate, a positioning sleeve, a sliding block and a locking part, wherein sliding grooves are formed in the bottom plate radially by taking the central point of the bottom plate as a circle center; central included angles in a length direction among adjacent sliding grooves are equal; scales corresponding to lengths of the sliding grooves are formed in one side in the length direction of the sliding grooves in the bottom plate; a positioning hole is formed in the axial direction of the positioning sleeve; an opening is formed in one end of the positioning sleeve; the end, where the opening is formed, of the positioning sleeve serves as an open end; the bottom wall of the positioning hole serves as a positioning surface; the open end penetrates through the sliding grooves in the bottom plate and is then connected with the sliding block; a positioning boss is arranged, or a clamping plate is connected, onto the outer wall, adjacent to the open end, of the positioning sleeve; a connecting hole matched with the open end is formed in the sliding block; a locking hole matched with the locking part is formed in the sliding block; a calibration device is arranged on the sliding block. By adopting the foundation bolt pre-burying auxiliary welding device, a foundation bolt can be welded by only one person, the working efficiency is high, and the welding quality is good.

The invention provides a closing structure for a flat tube of a condenser of an automobile air-conditioner, in order to solve the problems of a present flat tube structure that the inserting and positioning are difficult, the correcting for the center distance of collecting mains is required before brazing, the invariableness cannot be ensured during a brazing process after the correcting, the appearance effect is inferior, and the like, during a core manufacturing process. A joint of an end of the flat tube and the collecting main is arranged in a wedge form, namely, the size of an outer edge on one side of the port of the end of the flat tube is smaller than the size of an inner edge of an assembling hole of the collecting main, and then, is linearly increased to be consistent with the size of the outer edge of a tube body, so that a wedge-shaped transitional zone is formed between the tube body of the flat tube and the port. The closing structure provided by the invention has the beneficial effects that the flat tube can be conveniently inserted into the assembling hole on the collecting main and can be accurately positioned, the center distance between the collecting mains at two ends meets a design demand, and meanwhile, the welding reliability (zero leakage) is ensured. Besides, after the welding is finished, no closing trace of the flat tube can be seen and the appearance quality is increased.

The invention discloses a worm gear screw rod which comprises a novel helical tooth shaft, novel worm gears, a sleeve, an end cover, a worm gear shaft, a bearing and the like; the novel helical tooth shaft is a long shaft with helical teeth and is provided with a straight groove cut along a helical line which has the helical angle to be 90 degrees-alpha and is perpendicular to the direction of turning of the helical teeth and a cut with a chamfer to be 60 degrees; the helical teeth have the helical angle of alpha; as for each novel worm gear, a boss with the same section size as the cut is point-processed in a worm gear tooth surface; each worm gear tooth surface is in contact with a tooth surface line of the helical teeth; each boss is aligned at and matched with the cut; the worm gear shaft penetrates through a U-shaped groove formed in the sleeve and is installed on blind holes formed in the end cover through a rolling bearing; and under driving of a motor, the novel worm gears roll on the novel helical tooth shaft along the helical line, and helical transmission is realized by depending on the mechanical biting force. According to the worm gear screw rod, compared with the traditional screw rod, sliding friction is very small and unrelated to the driving force and the axial load, the kinetic helix rise angle can be more greatly increased, the transmission efficiency is higher, and transmission is smoother and more reliable.

The invention relates to a machining process for a tight-lock coupler body. A rough blank is cast by E-class steel with the thermal treatment hardness of HB241-291. When in machining, a bottom face of a bracket is milled and four installing holes on the bracket are drilled and two of the four installing holes are drilling-hinging position holes; meanwhile, the bottom face of the bracket and the two holes are adopted as a reference, namely, the positioning of one face and two pins, to fulfill the post processing procedures. By adopting the positioning of one face and two pins at the front end, the invention eliminates positioning errors and guarantees the correctness of each positioning and clamping as well as guarantees the center distance of a convex taper hole and a concave taper hole at the front end. In addition, the adoption of the positioning of one face and two pins can also ensures that all the post procedures conduct the positioning on the same reference without calibration of workpieces, which substantially shortens the time for the fixture, improves the efficiency and guarantees the product quality.

Theapplication relates to the technical field of chain wear test, in particular to a chain wear test device and a chain wear test method. The chain wear test device comprises a fixed plate, a movableplate, a driving device, a driving sprocket mechanism, a driven sprocket mechanism, a fixing component and a tensioning component; a first bearing block of the driving sprocket mechanism is arranged on the fixed plate; a driving shaft of the driving sprocket mechanism is inserted in the first bearing block, two ends of the driving shaft are sleeved with first sprockets, and the projections of thetwo first sprockets in a direction perpendicular to the axis of the driving shaft coincide with each other; the driving device drives the driving shaft to rotate; the movable plate can slide relativeto the fixed plate; the tensioning assembly is used for adjusting the distance between the movable plate and the fixed plate; the fixing component is used for fixing the movable plate to the fixed plate; and the driven sprocket mechanism comprises a second bearing block, a driven shaft and a second sprocket. The test device can simulate the real operation of a chain, and achieves the purpose of applying a large torque to the chain while saving energy.

The invention relates to the technical field of conveyor racks, in particular to a belt conveyor headstock and a manufacturing method of the belt conveyor headstock. A left side plate and a right side plate on the belt conveyor headstock are machined by the adoption of the same tool, in this way, positions and center distances of sleeves are effectively ensured, so that the center distance of the sleeve on the left side plate is in accordance with the center distance of the sleeve on the right side plate, then the coaxiality of main rollers is ensured when the main transmission rollers are installed, the transmission efficiency is ensured, belt off tracking is avoided, and working efficiency is improved.

The invention relates to a gear rack center distance adjusting mechanism, which comprises frames which are mounted on a base, wherein a synchronization rotating shaft is mounted in the width direction of the frames; two ends of the synchronization rotating shaft are mounted in bearing seats of two sides of the frames by bearings; upper wedge blocks are arranged under the bearing seats; the lower ends of the upper wedge blocks are provided with lower wedge blocks which are matched with the upper wedge blocks; the outer ends of the lower wedge blocks are connected with adjusting screws; the upper ends of two sides of the frames are provided with linear guide rails; sliding blocks which are mounted on the lower ends of tool rests are arranged on the linear guide rails; racks are mounted at two sides of the lower end faces of the tool rests; two synchronization gears are arranged on the synchronization rotating shaft in a sleeving way; the two synchronization gears are respectively meshed with the racks; and one end of the synchronization rotating shaft is connected with an output shaft of a servo motor by a coupler. The gear rack center distance adjusting mechanism has the advantages that the structure is simple; two ends of the synchronization rotating shaft do synchronous movement, and the movement is stable, so that the positioning precision of the tool rests is high, and the quality of a processed workpiece is ensured.

The invention discloses a ground assembly and installation method for an air box and ash discharge pipes of a chain grate. The ground assembly and installation method is characterized by comprising the steps that a lifting appliance is manufactured and bolt holes are opened according to the design sizes of flanges of the ash discharge pipes; a platform is arranged, and an air box body is invertedon the platform with a large opening facing downwards; the two horizontally placed ash discharge pipes are connected with the lifting appliance on the ground; the lifting appliance and the two ash discharge pipes are erected and lifted, and the ash discharge pipes are in butt joint with connecting ports of the inverted air box; after the butt joint of the connecting ports, the stressed points of the connecting ports are firmly welded through electric welding, the lifting appliance is dismantled, and then the butt joint of next group of ash discharge pipes is carried out; and after the connecting ports are fully welded, the air box and the ash discharge pipes which are connected together are turned over and lifted to the chain grate for installation in place. According to the ground assembly and installation method, the installation precision and efficiency of the air box and ash discharge pipes of the chain grate can be improved, the operability of the method is high, channel steel formanufacturing the lifting appliance is easy to find, used inverted chains are common tools, the flanges do not need to be measured by a steel ruler and a level gauge, the butt joint is in place in one step, and the method is convenient and accurate.