409results about "Expansion mandrels" patented technology

The invention discloses an integrated machining device suitable for a large marine propeller, which comprises a machining adjusting assembly, the machining adjusting assembly is composed of an X-axis moving mechanism, a Y-axis moving mechanism and a Z-axis moving mechanism, one side of the Z-axis moving mechanism is fixedly provided with a rotating mechanism, one end of the rotating mechanism is fixedly connected with a cutting assembly, and the other end of the rotating mechanism is fixedly connected with a cutter; according to the large marine propeller integrated machining device with the automatic machining function and the self-adaptive clamping function, through the integrated multi-axis linkage machining adjusting assembly and the three-dimensional scanner, automatic path planning can be conducted, and automatic operation is achieved; therefore, the dependence on advanced technicians is greatly reduced, the machining efficiency and the product consistency are remarkably improved, and meanwhile, through the collaborative design of the rotatable three-jaw chuck and the center supporting mechanism, simultaneous reliable supporting from the interior and the exterior of the workpiece can be automatically achieved during clamping.

The invention provides a slip machining device which comprises a mandrel, an elastic supporting assembly arranged on the outer surface of the mandrel, a first pressing plate and a second pressing plate, the outer surface of the mandrel is sleeved with the first pressing plate and the second pressing plate, a first clamping groove and a second clamping groove are formed in the first pressing plate and the second pressing plate respectively, and the two ends of a slip are clamped in the first clamping groove and the second clamping groove respectively. The end, away from the mandrel, of the elastic supporting assembly abuts against and makes contact with the surface of the slip. According to the slip machining device, enough supporting force can be provided through the first pressing plate, the second pressing plate and the elastic supporting assembly, vibration reduction performance can be provided for the slip through the elastic supporting assembly, and therefore the slip has good stability in the machining process, the slip is prevented from falling off from the loading mechanism, and the machining efficiency is improved. The workpiece precision and the machining efficiency are improved.

The invention discloses a drilling device and method for greenhouse steel pipe production, belongs to the technical field of steel pipe drilling, and provides the following scheme that the drilling device comprises a drilling mechanism, and a drilling auxiliary mechanism is arranged in the drilling mechanism; the drilling assembly moves downwards, a pulley moves along with the drilling assembly and extrudes an inclined plane between the pulley and a sliding rail, a first piston rod moves, an elastic supporting assembly is hydraulically driven to move, a supporting head enters a steel pipe fitting, the steel pipe fitting can be limited by the supporting head, and meanwhile an inner cavity of the steel pipe fitting is full of the supporting head; secondly, the elastic supporting assembly further drives the toothed bar and the clamping assembly to conduct transmission, so that the clamping assembly clamps and fixes the steel pipe, then extrusion movement between a pulley and a sliding rail is adopted, acting force can be converted through hydraulic pressure, and therefore the steel pipe can be clamped and fixed; and the toothed bar smoothly drives the clamping assembly to complete automatic positioning of the steel pipe fitting, so that the purpose of efficient operation is achieved.

The utility model discloses a slider type expanding mandrel tool, which belongs to the technical field of machining and comprises an outer shaft, fixing tables are uniformly distributed on the periphery of the surface of the outer shaft, supporting rods are rotatably connected to the fixing tables through pin shafts, a supporting plate is arranged right above the supporting rods, one end of the supporting plate is welded with a slider, and the other end of the supporting plate is welded with the slider. A guide column is fixed to one end of the exterior of the outer shaft, and an inner shaft is slidably connected to the interior of the outer shaft. The mandrel tool is arranged in a sliding structure composed of the sliding block, the sliding frame, the supporting plate, the supporting rod and the like, rapid clamping of a mandrel workpiece can be achieved, compared with a traditional clamping tool, the clamping time is greatly shortened, the workpiece clamping efficiency is improved, and the machining cost is reduced. And when a workpiece with thin wall thickness is clamped, the situations that the outer surface of the workpiece is scratched and the workpiece is deformed are avoided.

The invention relates to the technical field of lathe mandrels, in particular to a multi-stage expansion mandrel with an intelligent detection function. According to the technical scheme, a main shaft is included, a cylinder barrel is arranged on the outer ring of one end of the main shaft, a cylinder cover is arranged between the cylinder barrel and the main shaft, three sets of oil pipe joints are arranged on the cylinder barrel, more than three sets of expansion shafts are arranged at the position, located on the inner ring of the cylinder barrel, of one end of the main shaft, and an expansion assembly is arranged at the top end of each set of expansion shafts. The outer rings of the top ends of the expansion shafts are sleeved with nuts. The multi-stage expansion shaft and the multi-stage expansion assembly are matched with each other, so that workpieces with different inner diameters can be clamped and assembled, the replacement frequency of the expansion mandrel is avoided during multi-product operation, the production efficiency is improved, an operator can quickly disassemble, assemble and replace the expansion assembly through the arrangement of the nut, and the labor intensity of the operator is reduced. And subsequent daily overhaul and maintenance of the device are facilitated.

The invention discloses a workpiece rotation driving device for workpiece surface groove processing equipment, comprising: a clamping mechanism comprising a frame, a rotating base rotatably mounted on the bottom side of the frame, and a lifting base mounted on the upper side of the frame in a liftable manner; the covering type inner hole limiting assembly comprises a fixed barrel fixedly connected to the bottom side of the lifting base, a plurality of arc-shaped blocking and pushing plates are movably arranged on the periphery of the fixed barrel, an arc-shaped jacking plate is movably arranged between every two adjacent arc-shaped blocking and pushing plates, and the arc-shaped blocking and pushing plates and the arc-shaped jacking plates are each fixedly connected with a set of corresponding connecting rod pieces; the limiting driving mechanism comprises a driving shaft, sliding rods are obliquely and fixedly connected between the connecting rod pieces, and a plurality of inverted-T-shaped grooves used for being connected with the sliding rods in a sliding mode are formed in the outer side face of the driving shaft. According to the invention, the overall clamping effect of the workpiece can be effectively ensured, and the deformation of the workpiece mounting hole caused by spinning machining can be reduced.

The utility model relates to the technical field of positioning tools, and particularly discloses a quick positioning device for processing internal and external key grooves, which comprises a mandrel, an expansion sleeve, a nut and a processing workpiece, a threaded section is arranged on the surface of the mandrel, a positioning block is fixedly arranged on the surface of one end of the mandrel, a clamping groove is arranged on the outer circumferential surface of the expansion sleeve, and key grooves are arranged in an inner hole of the processing workpiece. Positioning strips are fixedly arranged on the outer circumferential surface of the expansion sleeve. According to the technical scheme, the opening seams are evenly distributed in the two ends of the expansion sleeve, the mandrel is attached to the conical surface of the expansion sleeve, the expansion sleeve is matched with the nut to achieve radial expansion of the expansion sleeve and used for clamping a workpiece, the positioning strip of the expansion sleeve is connected with the key groove of the machined workpiece in a clamped mode, and anti-play assembly of the expansion sleeve and the machined workpiece is achieved. The mandrel is clamped into the clamping groove of the expansion sleeve through the positioning block to achieve anti-play assembly of the mandrel and the expansion sleeve, so that when the two ends of the mandrel are fixed, a machined workpiece can be rapidly positioned, and the outer key groove to be machined of the machined workpiece can be conveniently machined.

The utility model relates to a positioning device for machining an integrated thin-walled tube, and belongs to the technical field of machining. When in use, an operator axially inserts the device into a pipe hole of the thin-walled pipe, adjusts the axial position of the conical pin through the screw rod, and further pushes the wedge-shaped block to move along the supporting pipe in the radial direction, so that the inner wall of the thin-walled pipe is supported in the radial direction, vibration of the thin-walled pipe in the machining process is effectively reduced, and machining efficiency is improved. Deformation and damage of the thin-walled tube caused by cutter pressure are avoided, the geometrical shape and dimensional accuracy of the thin-walled tube are guaranteed, and therefore the machining stability and the surface machining quality of the thin-walled tube are improved.

The present invention relates to the technical field of mechanical cutting, and specifically relates to a pipe welding beveling machine with an automatic positioning function, which includes a frame and a driving frame. A plurality of support arms are arranged between the driving frame and the frame. One end of the driving frame far from the frame is provided with a cutting assembly; by moving the driving frame along the axial direction of the pipe, the plurality of support arms are synchronously driven to expand radially along the pipe. After the plurality of support arms are in contact with the inner wall of the pipe, the frictional force generated by the multi-point contact cancels the cantilever load of the cutting assembly at the pipe port, so that the center of gravity of the beveling machine is stabilized inside the pipe. As the driving frame continues to move, the supporting force of the support arms on the pipe gradually increases, thereby compensating for the cutting force and vibration and improving the processing stability. Different from traditional beveling machines that rely on external fixtures or hoisting for fixation, this device can achieve automatic fixation by using a support arm structure with multi-point contact, is suitable for operation in narrow spaces, and improves the construction convenience.

The utility model relates to the field of machining technology, and relates to a turning fixture suitable for automobile bell housings. The utility model positions the housing through a positioning fixture, and the mandrel is connected to the clamping pins. The mandrel drives multiple clamping pins to synchronously extend out of the guide holes to center the housing. The multi-point clamping pins are used to contact the ball surface of the workpiece, and the workpiece is tightened when the mandrel is pushed forward. The assembly is convenient, the clamping is more stable, and the precision of the processed product is higher. At the same time, based on the centering clamping of the ball surface of the workpiece blank, the allowance of the next ball surface processing is reduced, and the allowance is more uniform, ensuring the product precision.

The invention relates to the technical field of mechanical cutting, in particular to a pipeline welding beveling machine with an automatic positioning function, which comprises a rack and a driving frame, a plurality of supporting arms are arranged between the driving frame and the rack, and a cutting assembly is arranged at one end, far away from the rack, of the driving frame; the driving frame moves in the axis direction of the pipeline, the multiple supporting arms are synchronously driven to be unfolded in the radial direction of the pipeline, after the multiple supporting arms are attached to the inner wall of the pipeline, the friction force generated by multi-point contact counteracts the cantilever load, located at the end opening of the pipeline, of the cutting assembly, and the gravity center of the beveling machine is stabilized in the pipeline; and along with continuous movement of the driving frame, the supporting force of the supporting arm on the pipeline is gradually enhanced, so that the cutting force and vibration are compensated, and the machining stability is improved. The situation that a traditional beveling machine depends on an external clamp or is fixed in a hoisting mode is avoided, automatic fixing can be achieved through a multi-point contact supporting arm structure, the device is suitable for operation in a narrow space, and construction convenience is improved.

The invention relates to the technical field of positioning of thin-walled workpieces, discloses a thin-walled workpiece anti-deviation positioning device based on a numerical control machine tool, and aims to solve the technical problems that thin-walled workpieces are prone to deformation during positioning and traditional clamping blocks are poor in adaptability. The thin-walled workpiece anti-deviation positioning device comprises a numerical control machine tool body, a rotating chuck, an adjustment driving assembly, a push rod assembly and an expansion positioning assembly; the circular-truncated-cone-shaped pushing block converts rotary motion into linear motion through a lead screw nut mechanism and is matched with the limiting assembly to drive the push rod assembly to synchronously, evenly and radially stretch out and draw back, the spring steel sheet with the preparation section is driven to achieve curvature self-adaption, and the preparation section can slidably compensate the arc surface section to adapt to thin-wall pipe fittings with different pipe diameters and keep surface contact. The device is provided with a front group of staggered expansion positioning rings and a rear group of staggered expansion positioning rings, full-circumferential gapless support on the inner wall of the pipe fitting is formed, the problem of stress concentration caused by line contact is avoided, deformation of the thin-wall pipe fitting is effectively prevented, the requirements for positioning firmness and deformation prevention are considered, and the machining qualification rate and production efficiency of the thin-wall pipe fitting are remarkably improved.

The invention discloses a continuous machining device for a motor base, which belongs to the technical field of motor base machining and comprises a machine table, a special-shaped frame is vertically mounted at the top of the machine table, a lifting plate is arranged at the top of the machine table, a rectangular cylinder is arranged at the bottom of the lifting plate, a telescopic body is arranged in the rectangular cylinder, and a mounting plate is vertically mounted at the top of the machine table; according to the continuous machining device for the motor base, the first adjusting assembly is arranged, when the transverse distance between the punching drill bits needs to be adjusted, the first motor is started to drive the first forward-reverse screw rod to rotate, and in the rotating process of the first forward-reverse screw rod, the first forward-reverse screw rod is driven to rotate, so that the transverse distance between the punching drill bits is adjusted; according to the drilling device, the two first threaded blocks engaged with the drilling bits in a threaded mode are driven to move, then the rectangular barrels installed at the bottoms of the first threaded blocks are driven to be adjusted, the transverse distance between the drilling bits is adjusted, the distance between workpiece drilling can be adjusted according to needs, and the machining range of the device is widened.

The utility model relates to the technical field of clamps, and discloses a manufacturing clamp which comprises a base, a straight plate is fixedly connected to the surface of the base, a clamping assembly is arranged on the side wall of the straight plate and comprises a rotating disc, the rotating disc is fixedly connected to the side wall of the straight plate, a fixing shaft is fixedly connected to the side wall of the rotating disc, and the fixing shaft is fixedly connected to the side wall of the straight plate. The interior of the fixing shaft is slidably connected with two groups of symmetrically arranged circular rings, a sliding groove is formed in the side wall of the fixing shaft, the interior of the sliding groove is slidably connected with two groups of symmetrically arranged mounting seats, and the mounting seats are fixedly connected to the side walls of the circular rings. According to the device, the two-way threaded rod is driven by the first motor to rotate, then the two circular rings are pushed to move relatively along the inner wall of the fixing shaft, the inclination angle of the supporting plate is changed, the end of the supporting plate is connected with the arc-shaped plate in a hinged mode, and therefore the attaching degree of the arc-shaped plate and the inner wall of the tubular part can be adjusted according to the inclination of the supporting plate; the precision of the clamp is improved.

According to the machining system and method for machining the revolving body through hole thin-wall shell, firstly, a smooth surface expansive force central spindle is aligned and clamped on a lathe clamp, the central spindle is installed on the through hole thin-wall shell with an inner hole machined in place, axial and radial positioning is achieved, then a lathe center is driven to push a conical face ejecting block, and the through hole thin-wall shell is machined in place. The elastic expansion sleeve and the smooth expansion sleeve are expanded through the two conical surface pairs, so that the smooth expansion sleeve is expanded slightly in the radial direction, the outer surface of the smooth expansion sleeve, namely the smooth support, forms high-rigidity support for the inner hole of the through hole thin-wall shell, and then the thin-wall outer circle is subjected to semi-finish turning and finish turning; after turning, the center of the lathe is withdrawn, compressed air is blown into an air chamber from an air inlet through an air gun, the conical surface ejector block is pushed away, the elastic expansion sleeve and the smooth surface expansion sleeve rebound, the smooth surface support is shrunk, parts are detached, and machining is completed. The device has a high-rigidity integral structure and local thin-wall support, can ensure high-rigidity support on a processing surface, avoids the influence of factors such as local cutter relieving and clamping deformation on the processing precision, and is extremely high in processing precision of the thin-wall outer diameter.

The utility model relates to the technical field of aluminum radiator machining auxiliary parts, in particular to an aluminum radiator machining positioning device which comprises a supporting platform and an outer sleeve shaft, the outer sleeve shaft is fixedly supported on the supporting platform, one end of the outer sleeve shaft is provided with a first tensioning cylinder, and the other end of the outer sleeve shaft is provided with a second tensioning cylinder. A first tensioning head is inserted into the first tensioning cylinder, a second tensioning head is inserted into the second tensioning cylinder, the positioning device further comprises a driving assembly, and the driving assembly can drive the first tensioning head and the second tensioning head to be close to each other and can drive the first tensioning head and the second tensioning head to be away from each other. Compared with a traditional one-end tensioning and positioning mode, the two ends of the aluminum radiator arranged on the outer sleeve shaft in a sleeving mode are tensioned and positioned, and the positioning effect is better.

The invention relates to the technical field of mechanical positioning, and particularly discloses a high-precision automatic positioning device which comprises a driver, a driving rod, a positioning pin and a positioning seat with a guide hole, the positioning pin is mounted on the driving rod and slidably connected in the guide hole, one end of the positioning pin is provided with circumferentially distributed elastic blocks, and the other end of the positioning pin is slidably connected in the guide hole. The tensioning block is matched with the elastic block in a wedge surface / conical surface mode, the elastic block is located on the outer side of the tensioning block in the circumferential direction, the driving rod pushes the positioning pin to move, the tensioning block and the positioning pin are coaxial, and after the tensioning block expands the elastic block, the elastic block abuts against the guide hole. According to the positioning method, a high-precision automatic positioning device needs to be used for positioning a to-be-positioned part, and the positioning method comprises the following steps that the positioning pins are controlled to be inserted into the positioning holes, and then the tensioning blocks are controlled to continue to move towards the positioning holes so as to expand the elastic blocks. The scheme is used for solving the problem that the positioning precision is difficult to ensure due to a gap between the positioning pin and the positioning seat.

The invention discloses an intelligent clamp for an intelligent manufacturing production line and a clamping method, and belongs to the technical field of clamps. According to the method, a body is of a cone frustum structure, the lower end of the cone frustum structure is connected with a connecting flange, and an annular shell is arranged on the periphery of the cone frustum structure; the circular truncated cone structure is provided with a bonding expansion sleeve for clamping a workpiece and a calibration piece, a pull rod and a piston for implementing measurement are arranged in the circular truncated cone structure, various circuits and related parts are arranged in the annular shell, and the flange is used for being connected with a machine tool. The clamp can achieve the purpose of accurately monitoring the machining state and the part clamping force in the precise machining process in real time.

The invention provides a manufacturing method of weak-rigidity thin-wall long-cylinder parts, aims to solve the problems that the weak-rigidity thin-wall long-cylinder parts cannot bear axial pressing force, are easy to vibrate and deform during machining, cannot guarantee the size and form and position precision of the parts and the like, and relates to the field of machining. In the manufacturing technological processes of forward and reverse turning of a right end inner hole annular groove, turning-around finish turning of the left end of an inner hole, forward and reverse turning of a left end inner hole annular groove, forward and reverse turning of an outer ring annular groove and finish turning of two end faces, an annular groove working procedure machining method is adopted, and the cutting force during annular groove machining is effectively reduced; the problem that turning deformation of the inner circle and the outer circle of the weak-rigidity thin-wall long-cylinder part is large is solved, finally, the machining efficiency is improved, the machining quality is guaranteed, and the stricter precision requirement of the high-precision weak-rigidity thin-wall long-cylinder part is met.

The invention relates to a tool for turning a high-speed motor stator spigot and a machining method of the tool, and relates to the technical field of high-speed motor stator machining.The tool comprises a stator mandrel, a tensioning part is integrally formed on the outer wall of the stator mandrel, a stator tensioning sleeve is arranged on the outer wall of the tensioning part in a sleeving mode, and the stator tensioning sleeve comprises a connecting ring and a plurality of tensioning strips; the plurality of tensioning strips are fixedly connected with the connecting ring at one end of the connecting ring, the plurality of tensioning strips are uniformly distributed in the circumferential direction of the connecting ring, the outer walls of the tensioning strips abut against the inner wall of the stator core, the inner walls of the tensioning strips abut against the outer wall of the tensioning part, the outer diameter of the tensioning part is gradually reduced in the axial direction of the tensioning part, and the wall thickness of the tensioning strips is gradually increased in the reducing direction of the outer diameter of the tensioning part. The motor base has the effects of ensuring the coaxiality of the spigots at the two ends of the motor base and the stator core and reducing the production cost.

The invention belongs to the technical field of turning, and particularly relates to a turning device for motor shaft machining, which comprises a lathe body and a slide rail arranged on the lathe body, a splash-proof door is slidably arranged on the lathe body, a three-jaw chuck is rotatably arranged on the lathe body, a tool apron and a moving part are slidably arranged on the slide rail, and the moving part comprises a containing seat. An avoiding groove and a limiting groove are formed in the accommodating seat; according to the turning device for machining the motor shaft, when a solid motor shaft blank is machined, a conical structure composed of the sharp claws can be directly utilized to abut against a center hole of the motor shaft blank to achieve positioning, and when a hollow motor shaft blank is machined, inner supporting and fixing can be achieved only by driving the sharp claws to expand in the radial direction through an adjusting mechanism; the embedded seat of the limiting mechanism can be matched with the limiting groove of the containing seat to lock the position of the mounting column, when workpieces of the same model are machined, the second handle is pulled to enable the sharp claw to be separated from the workpieces after locking of the mounting column is removed, rapid unloading of the workpieces is achieved, and when a new workpiece is clamped again, only the mounting column needs to be reset, and the original positioning precision can be restored.

The utility model relates to the technical field of machining. The inner supporting tool comprises a supporting plate, a plurality of sliding rails are evenly arranged on the supporting plate, sliding blocks are arranged on the sliding rails in a sliding mode, inner supporting pieces are arranged at the tops of the sliding blocks, a mounting base is arranged at the bottom of the supporting plate, and a driven gear is rotationally arranged on the mounting base. A plurality of arc-shaped through grooves are evenly formed in the driven gear, the bottoms of the sliding blocks are arranged in the through grooves in a sliding mode, the ends of the sliding rails are fixedly arranged on a mounting base, a driving assembly is arranged on the mounting base, a base is arranged at the bottom of the mounting base, a rotating shaft is arranged on the mounting base, and the rotating shaft is connected with the driving assembly. The rotating shaft is rotationally arranged on the base, and an adjusting assembly is arranged on the base. The utility model has the advantages that the inclination angle of the to-be-processed workpiece can be adjusted after the to-be-processed part is fixed, so that the to-be-processed part can be better machined.

The utility model discloses an internal expansion turning clamp device for achieving the lathe function of a machining center. Comprising an oil cylinder driving mechanism, a pull rod loosening mechanism, a tool apron mechanism and an internal expansion turning product tool. The oil cylinder driving mechanism is installed at the top of the pull rod loosening mechanism and used for pressing the pull rod loosening mechanism downwards, the bottom end of the pull rod loosening mechanism is provided with the internal expansion turning product tool, a product is internally expanded, supported and fixed by the internal expansion turning product tool, the tool apron mechanism is located below the internal expansion turning product tool, cutters are arranged in the tool apron mechanism, and the cutters face the lower portion and the side of the product respectively. The utility model designs the device for realizing the turning function of the machining center, so that the efficiency can be improved, and the cost can also be saved.

The utility model relates to the field of expansion clamps, in particular to a graphite expansion clamp which comprises a long taper shank, a connecting base is fixedly connected to the upper side of the long taper shank, a graphite elastic opening expansion clamp body is arranged on the upper side of the connecting base, and a metal slope block is arranged on the inner side of the graphite elastic opening expansion clamp body. Second threaded grooves are formed in the upper side of the long taper shank and the upper side of the connecting base, an adjusting mechanism is arranged between the connecting base and the graphite elastic opening expansion clamp body and comprises a lead screw fixedly connected to the upper side of the connecting base, a fixing plate is arranged on the lower side of the graphite elastic opening expansion clamp body, and a threaded block is rotationally connected to the lower side of the fixing plate. When the threaded block rotates, the threaded block can move up and down through the threaded connection between the threaded block and the lead screw, and the height of the graphite elastic opening expansion clamp body and the height of the metal slope block are adjusted through the connection between the threaded block and the fixing plate.

The utility model discloses a special work fixture for an aero-engine bearing chamber, which comprises a positioning and clamping disc, one end of the positioning and clamping disc is provided with a positioning boss matched with a bearing hole, and the periphery of the positioning boss is provided with a plurality of strip-shaped pressing plates used for pressing the bearing chamber on the positioning and clamping disc. A mandrel is arranged on the positioning boss, and a tensioning mechanism used for tensioning a center inner hole of the bearing chamber is arranged at the end, away from the positioning boss, of the mandrel. According to the scheme, stable clamping of bearing holes in the two ends of a bearing chamber in the machining process can be achieved, the machining precision and the surface roughness of the bearing holes are improved, the repeated positioning function is achieved, the clamping time is greatly saved, and therefore the machining efficiency is improved.

The utility model relates to the technical field of beveling machines, in particular to a pipeline end face beveling machine. The problem that in the prior art, a handheld beveling machine is difficult to machine a pipeline with the machining face pipe opening diameter smaller than the inner pipe diameter of the pipeline is solved, and the practicability of equipment is improved. The device structurally comprises a fixing seat, a fixing shaft is fixed to the fixing seat, a fixing mechanism used for tensioning and fixing the fixing seat from the interior of a to-be-beveled pipeline is arranged on the fixing shaft, and a control structure used for controlling the fixing structure to fix the to-be-beveled pipeline or break away from the to-be-beveled pipeline is further arranged on the fixing shaft. A beveling assembly used for beveling the pipeline to be beveled is further arranged on the fixing base, and a driving assembly used for driving the beveling assembly is further arranged on the fixing base. The pipeline machining device can machine a pipeline with the diameter of a machining face pipe opening smaller than the diameter of an inner pipe of the pipeline, and has high practicability.

The present application relates to the technical field of eccentric hole processing, and specifically to an eccentric hole fixture and processing lathe. The fixture includes a positioning seat and an internal expansion chuck assembly; wherein the positioning seat is used to connect to a machine platform, and the positioning seat is coaxially arranged with the rotating spindle of the machine platform; the internal expansion chuck assembly is inserted into the positioning seat, and at least part of the internal expansion chuck assembly can move radially along the positioning seat to adjust the distance between the central axis of the internal expansion chuck assembly and the rotating spindle in the radial direction of the positioning seat. The present application adopts an internal expansion chuck to position and clamp the inner hole of the product, and adjusts the eccentric outer diameter of the positioning column so that the outer diameter meets the eccentricity requirement of the inner hole of the product. A full-inclusive precision expansion clamp is used to meet the eccentricity while ensuring that the product's parallelism, flatness, verticality and cylindricity are within 0.01mm, and the position is within 0.015mm, meeting the accuracy requirements of the eccentric hole.

The invention belongs to the technical field of heat transfer pipe inner hole clamping mechanisms, and discloses a heat transfer pipe inner hole clamping mechanism capable of being quickly replaced, which comprises a clamping jaw module, a driving module and a clamping jaw mounting seat, the clamping jaw module is provided with a clamping jaw shell, a clamping jaw, a sliding block sleeve, a sliding block inner column and a clamping jaw baffle block; the driving module is provided with a lifting air cylinder, a telescopic air cylinder, a tensioning air cylinder and a tensioning air cylinder bottom cover, the telescopic air cylinder is arranged in the lifting air cylinder and can move up and down, the tensioning air cylinder is arranged in the telescopic air cylinder and can move up and down, the tensioning air cylinder bottom cover is installed below the tensioning air cylinder, the tensioning air cylinder is provided with a tensioning piston, and the tensioning piston is used for pushing the sliding block inner column. The clamping jaw module is installed on the clamping jaw installation base, and the clamping jaw installation base is connected with the tensioning air cylinder. The robot can adapt to heat transfer pipes with different hole diameters, multiple actual working conditions such as fixed installation and passive rotation are supported, and the clamping reliability, adaptability and maintenance efficiency of the steam generator heat transfer pipe maintenance robot in the complex environment are improved.

The invention belongs to the field of aero-engine manufacturing, and discloses a precision turning tool and method for machining a shell bearing assembly with a coating, the precision turning tool comprises a rotary base and an annular wedge block, the rotary base specifically comprises a clamping cylinder, a split type cylinder and a taper hole, rapid end face fitting positioning of the tool and the shell bearing assembly is achieved through a threaded hole, and the annular wedge block is arranged on the rotary base; and the adjusting screw is used for driving the annular wedge block to be pressed into the taper hole, so that the split type cylinder generates radial expansion, and a tensioning structure is formed. By the adoption of the tool, equipment dependence is remarkably reduced, the requirement for precise turning of the coating can be met without a high-precision machining center and a common numerical control lathe, efficiency is greatly improved, single-piece complex alignment is omitted, rapid batch clamping and positioning of shell assemblies are achieved, the numerical control lathe widely existing in common workshops has the high-precision machining capacity, and the cost is reduced. And production restriction caused by shortage of expensive special equipment is avoided.

The invention provides a radial and axial expandable core rod, which belongs to the field of mechanical engineering and comprises a first radial expansion module, a second radial expansion module, an axial expansion module and a driving module. A motor is fixed in a motor base groove of the driving module, a center shaft of the axial expansion module is in interference fit with a coupler and a lead screw, and the coupler is connected with a motor output shaft and the center shaft. The first radial expansion module is connected with the rear end shell through a nut mounting seat, a first bracket, a second rotating frame and a first transmission module; the second radial expansion module is connected with the front-end shell through the first rotating frame and the second transmission module, and the front-end shell is in axial sliding fit with the rear-end shell. A pin column sequentially penetrates through a coupler, a motor output shaft, a center shaft, a lead screw and corresponding hole positions of the first rotating frame, and driving of all the modules is achieved. According to the core rod, the front-end shell and the rear-end shell can be driven by the motor to independently complete axial or radial expansion and can also be expanded at the same time, universality and adaptation flexibility are both considered, and the production efficiency can be improved.