240results about "Tailstocks/centres" patented technology

The invention provides multichannel spinning and turning integrated equipment for a cylindrical part of a carrier rocket and a machining method. The multichannel spinning and turning integrated equipment comprises a lathe bed, a main spindle box, a closing-in spindle box, a spinning roller frame, a tail top, a heating system, a control system and a hydraulic system. The main spindle box, the closing-in spindle box, the spinning roller frame and the tail top are installed on the lathe bed. The main spindle box is connected with the closing-in spindle box and drives the closing-in spindle box to work, a cylindrical part blank is clamped between the closing-in spindle box and the tail top, the spinning roller frames are located on the two sides of the cylindrical part blank, and the heating system is installed on the spinning roller frames; the control system is connected with the main spindle box, the closing-in spindle box, the spinning roller frame, the heating system and the hydraulic system. The hydraulic system is connected with the main spindle box, the closing-in spindle box, the spinning roller frame and the tail top. Through cooperation of the main spindle box, the closing-in spindle box, the spinning roller frame, the tail top and the like, the in-situ machining function combining forced spinning machining, closing-in machining and turning machining of cylindrical parts, conical parts and curved-bus-shaped parts of the carrier rocket is achieved.

The invention relates to the technical field of eccentric shaft machining lathes, in particular to an eccentric shaft machining lathe with an eccentric center structure, which comprises a lathe main body, a fixed frame is fixedly connected to one side of the lathe main body, a movable frame is arranged on the fixed frame in a sliding fit manner, and a rotating seat is rotatably connected to the movable frame; a transmission mechanism is rotationally connected to the rotating seat, a stabilizing ring frame is rotationally connected to the rotating seat, a follow-up rotating ring is rotationally connected to the stabilizing ring frame, an eccentric block center mechanism is fixedly connected to the follow-up rotating ring, and an eccentric shaft is clamped and fixed to a three-jaw chuck on the lathe body; the eccentric block center mechanism is arranged on the follow-up rotating ring, the two angle-adjustable center plates abut against the fan-shaped eccentric block on the eccentric shaft, when the eccentric shaft rotates for machining, the fan-shaped eccentric block on the eccentric shaft is more stably and accurately supported, vibration, unbalance and deformation are reduced, and the machining precision and quality are improved.

The utility model discloses a hydraulic end face driving clamp for a shaft. The hydraulic end face driving clamp comprises a driving pin seat, a support and a base which are sequentially connected in the axial direction. A lower tip is embedded in the axis of the driving pin seat, and a driving pin penetrates through the driving pin seat and is movably arranged; a floating assembly, a lower push rod and a lower pull rod are sequentially arranged below the driving pin in an ejecting mode and axially penetrate through the support and the base. According to the hydraulic end face driving clamp for the shaft, the upper portion and the lower portion of the clamp are positioned through center holes, a lower tip is changed into a fixed tip, the end face is driven through the floating assembly after positioning, the driving pin is made to be in a floating free movement mode and can float along with jumping of the end of a part, and it is guaranteed that the driving pin is evenly stressed.

The present invention relates to the technical field of mechanical manufacturing, and disclosed are a centering fixture, machining tool and machining method for a hollow shaft. The centering fixture comprises a center rod; truncated-conical holes for matching tool centers are formed at two ends of the center rod; a first end of the center rod is provided with a truncated-conical boss for abutting against one end of the hollow shaft; a truncated-conical plug for abutting against the other end of the hollow shaft is movably fitted over a second end of the center rod; the truncated-conical plug and the center rod rotate synchronously; and a power pin for fitting a transmission rod of the tool centers is provided on the truncated-conical boss. The centering fixture for a hollow shaft provided by the present invention uses the friction force and clamping force between tool centers and a center rod of a centering fixture, and also increases a mechanical transmission mode by means of fitting of a power pin provided on the centering fixture and a transmission rod of the tool centers, thereby avoiding the problem of rotation delay of the hollow shaft during machining, and improving the finish machining effect of the hollow shaft.

The invention belongs to the technical field of eccentric shaft machining, and particularly discloses an eccentric shaft multi-procedure one-time clamping machining technology and device which comprises a lathe bed body, a switchable positioning unit, a modular tool magazine, a precision detection module and a control system, and the switchable positioning unit, the modular tool magazine, the precision detection module and the control system are arranged on the lathe bed body. The switchable positioning unit comprises a three-jaw centering assembly, a manual fine adjustment chuck, an automatic compensation positioning mechanism and a tailstock center, the three-jaw centering assembly is in sliding connection with the top position of the lathe bed body, and the manual fine adjustment chuck and the automatic compensation positioning mechanism are both connected with the three-jaw centering assembly through a switching gear set; the modularized tool magazine is located on one side of the lathe bed body. According to the multi-procedure one-time clamping machining technology and device for the eccentric shaft, one-time clamping can meet two precision requirements, the equipment specialization problem is solved, the equipment input cost is reduced, the equipment utilization rate is increased, and meanwhile the machining precision and efficiency are guaranteed.

The invention discloses a multi-station turning device for part production, and particularly relates to the technical field of turning machining, the multi-station turning device for part production comprises a numerical control lathe body, an electric tailstock is slidably connected in the numerical control lathe body, a first mounting frame is arranged in the numerical control lathe body, and a second mounting frame is arranged on one side of the first mounting frame; according to the numerical control lathe, multiple connecting columns drive clamping plates to be closed to clamp and fix the two ends of the long-axis part through springs in multiple mounting caps, so that the two ends of the long-axis part can be clamped and fixed at the same time, the stability of the device during placement is kept, a second driving motor can be started through a PLC of the numerical control lathe body, and the machining precision is improved. Furthermore, the two second moving seats are far away from each other in opposite directions under the thread transmission action of the two-way screw rod, and then the use distance between the two mounting frames can be adjusted, so that the mounting frames can adapt to long-axis parts with lengths.

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 application provides a special tool for a flat top center, which can guarantee the positioning accuracy and stability of the top center and ensure the machining accuracy of the blade. The tool comprises a top center shaft, which is installed in a top center seat, the top center seat is installed in a mounting cavity of a machine tool slide cylinder, and the top center seat and the top center shaft are connected by screws, the shape of the mounting cavity of the machine tool slide cylinder is matched with the shape of the top center seat; the top center shaft comprises a shaft body and a top head, the top surface of the top head is a flat surface, and the top surface of the top head is fixedly installed with a tooth surface pressing block; the shaft body comprises three cylindrical sections with decreasing radii from top to bottom, namely a first cylindrical section, a second cylindrical section and a third cylindrical section, the outer part of the joint between the third cylindrical section and the top center seat is successively sleeved with a thrust ball bearing and a needle bearing from top to bottom; the outer part of the joint between the second cylindrical section and the top center seat is successively sleeved with a pair of angular contact ball bearings from top to bottom, the upper end surface of the outer ring of the upper angular contact ball bearing is press-fitted with an end cover, the end cover is sleeved on the outer part of the first cylindrical section, and a first sealing ring is arranged at the joint between the end cover and the first cylindrical section.

A workpiece support (18) for supporting a workpiece (14), the workpiece support (18) comprising a workpiece support body (54) and a workpiece support element (20) associated with the workpiece support body (54) for engaging the workpiece (14) and a piezo electric actuator (32) being associated with the workpiece support body (54) for moving the workpiece support element (20) for supporting the workpiece (14). The workpiece support body (54) comprising one or more flexures (44) that enable a movable portion (42) of the workpiece support body (54) to move when acted on by the piezo electric actuator (32) and to move the workpiece support element (20). The workpiece support (18) can comprise two or more workpiece support bodies (54) and a piezo electric actuator (32) being associated with each workpiece support body (54) for moving the respective workpiece support elements (20).

This application discloses a fixing device for a double-ended stud bolt used in machine tools, relating to the technical field of machine tool fixtures. It includes a machine tool body, a chuck rotatably mounted on the machine tool body, an abutment member, and a tailstock slidably mounted on the machine tool body. The chuck is perpendicular to the sliding direction of the tailstock. The abutment member is rotatably mounted on the tailstock, with an abutment hole at one end away from the mounting rod, the center of which is at the same height as the center of the chuck. The chuck clamps one end of the double-ended stud bolt, and then the tailstock slides, causing the abutment member on the tailstock to abut against the other end of the double-ended stud bolt. One end of the double-ended stud bolt is held by the chuck, while the other end directly abuts against the abutment hole. This eliminates the need for pre-drilling and cutting off the drilled portion, simplifying the processing flow and improving production efficiency. Furthermore, it eliminates the need to reserve space for cutting off the drilled portion, saving production costs.

The invention belongs to the technical field of composite numerical control machine tools, and particularly relates to a ten-axis five-linkage intelligent composite numerical control machine tool which comprises a machine tool base, two workpiece tail bases are slidably connected to the upper portion of the machine tool base and symmetrically arranged in the length direction of the machine tool base, and a cutter sliding table is fixedly installed in the middle of the upper portion of the machine tool base. The cutter sliding table is used for bearing a cutter assembly; a cutter rotary table is rotationally connected to the upper portion of the cutter sliding table and can drive the cutter assembly to rotate, so that the machining track of the cutter coincides with the throat diameter plane of the workpiece. By means of the ten-axis five-linkage arrangement and the cooperation of the symmetrically-arranged workpiece head and tail frames and the middle cutter sliding table, precise machining of complex workpieces can be achieved, the machining precision of the workpieces is guaranteed, and the machining requirements of high-precision parts and complex-surface-roughness parts are met. The problems that small-modulus workpieces in the current market are poor in adaptability, and large-modulus multi-specification machining requirements cannot be met are solved.

The utility model relates to the technical field of machine tool equipment, in particular to a wedge surface locking mechanism which comprises a shell, a driving wedge block, a driven wedge block and an oil cylinder, a sliding way is arranged in the shell, a piston and an elastic piece are arranged in the oil cylinder, one end of the piston is connected with the driving wedge block, and the other end of the piston is connected with the elastic piece used for pressing. The driving wedge block is driven by the piston to transversely move in the sliding way, and the driven wedge block and the driving wedge block are matched to move up and down in the sliding way so as to abut against or loosen a moving part of a machine tool. The locking mechanism is low in manufacturing cost, simple in structure, suitable for moving assemblies on various machine tools, convenient to install and use, and more reliable and safer due to the fact that wedge face locking is adopted.

The present application belongs to the technical field of machine tool equipment, and in particular to a top pin structure of a vertical cradle five-axis turning and milling combined machine tool, comprising a machine tool, wherein the base of the machine tool is arranged in a U shape with the opening direction facing upwards. The structure, by arranging the top pin mechanism, significantly improves the accuracy and motion stability of the top pin pressure adjustment, the rolling contact design of the main and auxiliary balls greatly reduces the friction loss in the force transmission process, and the fine adjustment of the top pin pressure can be realized through the threaded transmission of the threaded rod, meeting the pressing needs of different material rods; the pre-compression structure of the spring provides stable pre-tightening force and realizes fast resetting of the top pin, avoiding jamming; the design of the guide sleeve and the hard alloy contact end limits the radial swing of the top pin, ensures the coaxiality of the top pin and the material rod, reduces the machining eccentricity error, and on the other hand, enhances the wear resistance of the top pin and prolongs the service life; the overall structure makes the top pin bear force evenly, effectively avoids the displacement of the material rod under pressure, and improves the workpiece size accuracy.

The utility model discloses a floating type tailstock supporting mechanism, a multi-axis turntable and a machine tool, the floating type tailstock supporting mechanism is arranged at the tail part of a C-axis machine body, the floating type tailstock supporting mechanism comprises a tailstock body and a rotary supporting shaft, the rotary supporting shaft is connected with the C-axis machine body, and the C-axis machine body is connected with the C-axis machine body. The rotary supporting shaft is supported on the tailstock body through a self-aligning ball bearing. According to the technical scheme, the C-axis machine body adopts the floating type supporting tailstock supporting mechanism as a tail support, and the floating type supporting tailstock supporting mechanism adopts the self-aligning ball bearing, so that the floating type supporting tailstock supporting mechanism has the self-aligning angle capacity within a certain angle range, the tailstock floating effect is achieved, and the service life of the machine body is prolonged. The device is used for counteracting errors caused by assembling and machining precision of a C-axis machine body and the like, it can be guaranteed that deformation caused by assembling errors and external poor stress is avoided when the rotary table rotates, the influence caused by perpendicularity deviation is counteracted, and the reliability of product performance is guaranteed.

A tailstock assembly (60) for a grinding machine (10) comprises a base (96) and a table (98) which is mounted on the base (96) and is movable relative to the base (96). The table (98) supports a superstructure (114) that provides an interface (116) with a receptacle (120) for a bearing block (102) supporting a center (62, 106, 160, 170, 180, 190, 200, 210, 220, 230) for workpiece mounting. The center (62, 106, 160, 170, 180, 190, 200, 210, 220, 230) has a center axis (108). The interface (116) is offset laterally relative to the center axis (108). A grinding machine (10) has a machine frame (14) and a tailstock assembly (60) arranged on the machine frame (14). A method for changing centers on a grinding machine (10) utilizes such a tailstock assembly (60).

The utility model relates to the technical field of machining, and provides a lathe with a cutter convenient to adjust, which comprises a frame provided with a first tip, a slide rail arranged on the frame, a slider slidably arranged on the slide rail and provided with a second tip, the second tip and the first tip are coaxially arranged, and a support plate movably arranged on the frame and provided with a mounting frame. The cutter is arranged on the mounting frame and used for machining a workpiece, and the position sensor is arranged on one side of the cutter and used for detecting the end face position of the workpiece to be machined. By means of the technical scheme, the problem that in the prior art, a centering and positioning lathe is poor in machining precision is solved.

The utility model discloses a positioning clamp for machining a clutch shaft sealing ring groove through a numerical control lathe. The positioning clamp comprises a center body, a tailstock center, a datum plate and a transmission pin. The datum plate is provided with a first datum plane and pin holes, and the pin holes are evenly formed around the axis of the center body. The workpiece is provided with a second datum plane, connecting holes and center positioning holes, the two center positioning holes are formed in the centers of the two ends of the workpiece respectively, and the multiple connecting holes are formed around the axis of the workpiece; the datum plate is sleeved and fixed on the center body, the center body is fixedly connected with a main shaft of a lathe, and the tailstock center is arranged on a tailstock of the lathe; the center body and the tailstock center are inserted into the center positioning holes in the two ends of the workpiece respectively, and the transmission pin penetrates through the pin hole and the connecting hole. The tool compensation value can be calculated by measuring the distance between the first datum plane and the second datum plane, the correct axial machining size can be conveniently and accurately found by setting the tool compensation amount through a numerical control lathe, the clamping adjustment time is shortened, and batch machining of shaft parts is facilitated.

The invention relates to motor shaft machining, in particular to a shaft body support for motor shaft machining, and is characterized in that a hook-shaped hanging plate arranged in a hanging mode is provided with a downward hooking face, the hooking face is an arc face matched with the peripheral wall of the equal-diameter section of a machine tool center, one side of the hanging plate is connected with a bracket through a connecting frame, and the bracket is provided with a V-shaped groove with an upward opening; the round core of the hooking face is located in the angular bisection face of the V-shaped groove, and a limiting fit for limiting the bracket to be close to or away from the round core of the hooking face is arranged between the connecting frame and the bracket. The arc-shaped hooking surface on the hanger plate is matched with the center of the machine tool in a hooking manner, the shaft to be machined is supported in the V-shaped groove in the bracket, and the concentricity of the shaft to be machined and the center of the machine tool can be adjusted only by adjusting the height of the bracket. And the negative influence of the mounting error between the bracket and the lathe bed and the matching error between the lathe center and the lathe bed on the concentricity of the to-be-processed shaft and the lathe center is eliminated.

The utility model discloses a clamping device, which belongs to the technical field of machining equipment and comprises a base, a chuck, a first tip, a sliding seat, an adjusting seat, a second tip, a first eccentric wheel and a second eccentric wheel. The chuck is installed on the machine base, the first center is installed on the chuck, the sliding base is arranged on the machine base in a sliding mode in the axial direction of the first center so as to be close to or away from the first center, the adjusting base is installed on the sliding base, and the second center is installed on the adjusting base. The first eccentric wheel and the second eccentric wheel are rotationally mounted on the sliding seat; the first eccentric wheel and the second eccentric wheel are both in transmission connection with the adjusting base so that the axis of the second center can be adjusted to coincide with the axis of the first center. The clamping device is simple in structure, easy to adjust and operate and capable of improving workpiece machining efficiency and quality.

A numerical control device (1) controls a machine tool (10) so as to perform machining, in a state in which a pressing part (41) of the machine tool (10) is pressed against a machining target (W) along a predetermined axis (X) by torque control, while moving the machining target (W) in a direction along the axis (X). The numerical control device (1) is provided with at least one memory (3) and at least one processor (4). The memory (3) stores an allowable range of a relative physical quantity relating to relative movement in the axis (X) direction of the pressing part (41) with respect to the machining target (W). The processor (4) acquires a first physical quantity relating to movement in the axis (X) direction of the machining target (W) and a second physical quantity relating to movement in the axis (X) direction of the pressing part (41), and compares a difference between the first physical quantity and the second physical quantity with the allowable range.

The utility model relates to the technical field of numerical control machine tools, in particular to an external oil cylinder tailstock of a numerical control machine tool, which comprises a fixing plate, a tailstock body is mounted on the upper surface of the fixing plate, a tailstock sleeve is fixedly connected to the inner wall of the tailstock body, and a tip is detachably mounted in the tailstock sleeve. An oil cylinder connecting plate is fixedly connected to the side, away from the center, of the tailstock body, an oil cylinder body is detachably installed on the side, away from the tailstock body, of the oil cylinder connecting plate, a positioning device is arranged on the surface of the oil cylinder connecting plate and comprises a supporting plate, and the supporting plate is fixedly connected to the lower surface of the oil cylinder connecting plate. According to the utility model, the problem that the oil cylinder body is relatively complicated to mount due to the fact that the oil cylinder body and the oil cylinder connecting plate are generally connected through bolts and the oil cylinder body needs to be supported by a maintainer and controlled to be positioned at the same time when the oil cylinder body is mounted is solved.

The application relates to the technical field of machining machine tools and discloses an intelligent turning machining machine tool based on multi-station numerical control, which comprises a machine tool body, a clamping mechanism arranged at one end of the machine tool body, a sliding rail arranged at the bottom of the clamping mechanism, a movable base slidingly installed on the sliding rail, a cutter mounting rack arranged at the top of the movable base, a cutting tool arranged on the cutter mounting rack through fasteners and a tailstock slidingly installed on the sliding rail, a chip breaking component is detachably arranged at the top of the cutter mounting rack, the chip breaking component comprises a high-pressure cooling assembly and a chip blocking assembly arranged on the high-pressure cooling assembly, and the chip blocking assembly comprises a baffle slidingly installed on the high-pressure cooling assembly. The baffle can move forward and backward and deflect in an angle along with the impact of the cutting chip through design, and the high-pressure cooling assembly can exert instantaneous impact load at the bending point of the cutting chip, so that the chip breaking effect is further strengthened, and the problem that the cutting chip slips on the surface of the baffle or cannot be broken is effectively avoided.

The utility model provides a hydraulic tailstock locking device, and belongs to the technical field of machining. The problems that in the prior art, clamping force is unstable, and operation is tedious are solved. The tail seat comprises a tail seat base, a hard rail seat and a tail seat body, a piston cylinder body is formed above the hard rail seat, a piston cavity is formed in the center of the piston cylinder body, a brake block is installed in the piston cavity, the end of the brake block is connected with a piston rod, a through hole is formed in the tail seat base, and the piston rod penetrates through the through hole. A sealing plate is fixed to the bottom of the tailstock base in a sealed mode, a gland is fixedly installed at the upper end of a piston cylinder body of the tailstock base, a first oil injection hole is formed in the side end face of the gland, a second oil injection hole is formed in the lower end of the gland, and the first oil injection hole is communicated with the second oil injection hole. A mounting block is formed at the top of the tailstock base, a mounting groove is formed in the bottom of the tailstock body, and the mounting block extends into the mounting groove to be fixedly connected. The device has the advantages of high automation degree, high precision, simple structure and wide application range.

The utility model discloses a special tool for fine turning of turbine shafts, which comprises a shell, an assembly rod, a hydraulic cylinder and a rotation stopping handle, a plurality of bearings are arranged in the shell, an assembly cylinder is inserted in the bearings, a plurality of driving grooves are arranged on the inner wall of the assembly cylinder, a plurality of rotation stopping grooves are arranged on the surface of the assembly cylinder, and a plurality of driving strips are fixedly connected on the surface of the assembly rod. The hydraulic cylinder is installed at the left end of the shell, a piston rod of the hydraulic cylinder is rotationally connected with the right end of the assembling rod, the rotation stopping handle is in threaded connection with the shell and provided with a rotation stopping head matched with the rotation stopping groove in size, the assembling barrel rotates through the bearing, the assembling rod is inserted into the assembling barrel, and the assembling rod can also rotate. The hydraulic cylinder pushes the assembling rod to move in the assembling barrel, the assembling barrel drives the top seat to abut against the end of the turbine shaft through the drill bit clamp, the two ends of the turbine shaft are fixed in cooperation with the chuck, the rotating stability of the turbine shaft is improved, and the machining precision of the turbine shaft can be improved.

The utility model discloses a slender rod machining center convenient to use. The slender rod machining center comprises a body and a center body. An inserting hole is formed in the top of the body, a connecting shaft is integrally formed at the bottom of the tip, an adjusting knob is rotatably installed at the bottom of the inner side of the body, a screw is fixedly installed at the circle center of the top of the adjusting knob, a sleeve is fixedly installed in the body and located above the adjusting knob, an adjusting rod is movably installed in the sleeve, and the screw is rotationally connected into the adjusting rod. A support is fixedly installed at the top of the adjusting rod, a sliding groove is formed in the top of the support, movable seats are symmetrically installed on the two sides in the sliding groove in a sliding mode, and movable arms are movably installed in the two movable seats through rotating shafts. The center and the main body can be quickly disassembled and assembled, so that centers of different sizes can be quickly replaced for installation and use, the centers can also be quickly replaced when being abraded, and the problems that an existing machining center is inconvenient to replace and high in use cost in the use process are solved.

The utility model relates to the field of numerical control machine tools, in particular to a tailstock sleeve structure for a numerical control machine tool. The sleeve body is rotationally installed above the tailstock body through an adjusting assembly, the surface of the sleeve body is symmetrically and fixedly sleeved with two hollow fixing rings, and each hollow fixing ring is internally provided with four positioning assemblies; and the positioning assembly comprises a screw rod rotationally mounted in the hollow fixing ring. According to the utility model, the two driving bevel gears are driven by the double-shaft motor, and then under the transmission of the driven bevel gears and the transmission bevel gears, each screw can rotate synchronously, so that each clamping block is driven to move synchronously, the distance between the clamping blocks is changed, and the effect of fixing workpieces with different sizes and specifications can be achieved; and meanwhile, the angle of the workpiece can be adjusted through the driving motor, and the machining effect on the workpiece is improved.

The utility model discloses an anti-top-damage device for a center hole of a steering gear shaft part, and relates to the related technical field of shaft part machining. The device comprises a machine table, a fixing sleeve, supporting angle iron and a shaft body, a connecting shaft is fixed to the output end of the machine table, the fixing sleeve is connected to the peripheral side of the connecting shaft in a sleeved mode, a connecting frame is fixed to the end, away from the machine table, of the fixing sleeve, the supporting angle iron is arranged above the connecting frame, and a first connecting block and a second connecting block are fixed to the bottom of the supporting angle iron along the corner edge. The bottom end of the first connecting block is rotationally connected with a threaded rod, and a shaft body is movably arranged in the supporting angle iron. By arranging the machine table, the fixing sleeve, the supporting angle iron and the shaft body, the problems that when steering gear shaft parts are machined and clamped, an operator needs to manually align a center hole to easily cause damage, and the parts are easily scratched after being dismounted after being machined are solved.

The utility model discloses a numerical control lathe tailstock stopper relates to lathe processing technical field. Including lathe bed, the top of lathe bed is slid and is installed with tailstock, and the top one end middle fixed mounting of lathe bed has the first stud for preventing tailstock and is used, the one end below of tailstock is provided with the limiting component for fixing tailstock position, and can adjust the spacing size, the utility model discloses through the base and the first stud fixed, complete the fixation of limiting component, the worm and the screw rod transmission structure push the top rod piece and tailstock welded fixed, form rigid mechanical locking, replace traditional friction brake, rotate the turntable drive worm gear drive, the locking force that the screw rod and fixed plate screw cooperation produces, can resist workpiece top tight counterthrust and centrifugal force, avoid tailstock displacement, need not rely on friction plate, through mechanical structure rigid fixed tailstock, prevent the locking failure caused by brake component wear, reach the effect that prevent tailstock deviation.

The utility model relates to a flexible center for centering the tail part of a main cylinder body, and belongs to a machining tool of an automotive brake main cylinder body. The hollow column of the tip body is in threaded connection with the stud, the outer sleeve is sleeved outside the hollow column of the tip body, the large spring is sleeved outside the hollow column, the small spring is located in the hollow column, the tip is located in the hollow column at the front end of the small spring, and the rear end of the jacking column is located in a hole at the front end of the outer sleeve. The cover penetrates through the center, the large spring and the jacking column through the center hole and the jacking column hole, then is arranged outside the front end of the outer sleeve in a sleeving mode and is fixedly connected with the outer portion of the hollow column of the center body in a jacking mode through an inner hexagonal bolt. The fixture has the advantages that the structure is novel, the problems that the axis of the main cylinder body and the axis of the tip do not coincide, the tip cannot tightly jack a workpiece, the workpiece is loosened during machining, and the size of a machined part is unqualified are solved, and therefore the machining quality and the product percent of pass of the main cylinder body are guaranteed.

A horizontal lathe for manufacturing a porous optical fiber preform, the horizontal lathe being configured to hold and fix two opposite ends of a target in such that a longitudinal direction of the target is a substantially horizontal direction, and cause the target to be rotated around an axis parallel to the longitudinal direction thereof as a rotation axis, has a thermal expansion absorbing mechanism configured to absorb a change in dimension of the target, the change being due to thermal expansion of the target in a direction of the rotation axis. The horizontal lathe includes a first chuck jaw configured to hold one end of the target and be rotatable about the rotation axis; and a second chuck jaw configured to hold the other end of the target and be rotatable about the rotation axis. The thermal expansion absorbing mechanism is a mechanism in which the second chuck jaw is configured to be movable in a direction of the rotation axis of the target.