76results about How to "Reduce the impact of machining accuracy" patented technology

A benchmark deviation compensation type processing method used for a box or shell part comprises the steps as follows: firstly, the box or shell part is positioned and clamped on CNC (computer numerical control) machining equipment with a transition benchmark serving as a positioning benchmark; secondly, actual measurement distance values of a transition benchmark zero relative to a main positioning benchmark zero are detected, and difference values between each actual measurement distance value and a corresponding theoretical distance value are calculated respectively; thirdly, a coordinate value of the transition benchmark zero is corrected through the difference values to form a corrected transition benchmark zero; and fourthly, the corrected transition benchmark zero is taken as a workpiece coordinate system zero to process a to-be-processed structure on the box or shell part. Besides, the invention further provides a processing system used for realizing the processing method. According to the processing method and the processing system provided by the invention, actual deviation between the transition benchmark and the main positioning benchmark is compensated, so that an error of benchmark noncoincidence caused by the fact that the benchmarks are not unified in a processing process of the box or shell part is eliminated, and the processing quality of the part is improved.

The invention relates to a silicon micro angular vibration output gyroscope composed of an upper layer and a lower layer. The upper layer is a gyroscope mechanical structure arranged on a monocrystalline silicon wafer. The lower layer comprises signal leads arranged on a glass substrate. The upper mechanical structure is composed of two similar-structured substructures, wherein the substructures are symmetrically arranged left and right, and the substructures are connected through a mass block connecting mechanism. The two substructures are respectively connected to crossbeams, which are connected to fixed pedestals through horizontal torsion bars. The fixed pedestals are arranged on fixed pedestal bonding sites on the glass substrate. Therefore, the upper mechanical structure is suspended above the lower glass substrate. The signal leads and the bonding sites are arranged on the lower glass substrate. According to the invention, with the horizontal torsion bar and the crossbeams, the gyroscope rotates around the z axis. Therefore, sensitive motion of the gyroscope is realized; motion decoupling of a driving direction and a detection direction is realized; the number of interference modes is reduced; requirement to processing precision is reduced; and sensitivity of the gyroscope is improved.

The invention relates to an adjusting nut machining device and a machining process thereof. The adjusting nut machining device comprises a manipulator, a rotary table and eight machining mechanisms; the eight machining mechanisms are arranged in turn and comprise a first machining mechanism, a second machining mechanism, a third machining mechanism, a fourth machining mechanism, a fifth machining mechanism, a sixth machining mechanism, a seventh machining mechanism and an eighth machining mechanism; the first machining mechanism is used for performing cylindrical mechanical machining and drilling; the second machining mechanism is used for cutting grooves, drilling radial holes and performing reaming; the third machining mechanism is used for machining inclined surfaces and drilling through holes; the fourth machining mechanism is used for machining extrusion inclined surfaces and boring; the fifth machining mechanism is used for turning over and machining the end surfaces and performing chamfering; the sixth machining mechanism is used for performing cylindrical machining and performing coarse tapping; the seventh machining mechanism is used for performing cylindrical machining and performing thread fine machining; the eighth machining mechanism is used for performing loading, unloading and burring; the eight machining mechanisms are arranged around the rotary table in a surrounding mode; the rotary table can rotate around a center shaft; the positions of the manipulator and the eighth machining mechanism are corresponding to each other. According to the adjusting nut machining device and the machining process thereof, the loading and unloading is performed through the manipulator, meanwhile the feeding is performed between the eight machining mechanisms through the rotary table which can rotate, the eight machining mechanisms work simultaneously, and accordingly the working efficiency is improved.

The invention discloses a warm extrusion forming method for a straight toothed spur gear. The blank is heated by adopting warm forming and combining differential temperature forming, and reasonable die design and lubricating selection are realized. According to the technical scheme, the first method comprises the following steps of extruding, upsetting and performing reverse secondary extrusion (in the same set of extrusion set); and the second method comprises the following steps of extruding and performing reverse secondary extrusion (concave dies of different sizes). According to the forming process, the forming force can be effectively reduced, and the tooth filling form is good. The warm extrusion forming method has the advantages that the defects that the cutting machining method is low in material utilization rate, low in production efficiency and high in product cost and the gear strength and service life are reduced because the metal fiber is cut are overcome; and meanwhile, the problems that the other plastic forming methods are high in forming force, difficult in corner filling and short in service life of the die and the like are solved, and the warm extrusion forming method is expected to realize industrial production of straight toothed spur gears in the field of plastic forming.

The invention discloses special equipment for laser mirco-cladding. The equipment comprises a workbench, a laser processing system and a control system, and is characterized by also comprising a charge coupled device (CCD) monitoring and positioning system and a direct writing system, wherein the CCD monitoring and positioning system comprises a coaxial CCD sensor, a paraxial CCD sensor, a zoom lens, an imaging eye lens, a zoom optical system, a paraxial imaging object lens and an external monitor; the direct writing system comprises a micro-pen direct writing device and a micro-jet direct writing device; the micro-pen direct writing device comprises a support, a guide rail, a cylinder, a slider, a piston rod, a dial gauge, a micro adjustment nut and a micropen; and the micro-jet direct writing device comprises a water bath kettle, a gas-guide tube, a micro-pressure gauge and a micro-jet tool. In respect of the equipment, a laser optical path and the installation stations and working modes of the micro-jet direct writing device and the micropen are reasonably designed, and laser processing, the micropen and the micro-jet direct writing system are integrated on the same working platform, thereby realizing advantage complementation of various processing methods.

The invention relates to a five-axis-head water cutting machining device with an accuracy adjusting device. The five-axis-head water cutting machining device with the accuracy adjusting device comprises a rotating shaft structure, a deflection shaft structure, a water jet spraying device and the accuracy adjusting device; the rotating shaft structure is connected with the deflection shaft structure, the deflection shaft structure is connected with the water jet spraying device, a certain angle is formed between the axis of the rotating shaft structure and the axis of the deflection shaft structure, and the axis of the rotating shaft structure and the axis of the deflection shaft structure are intersected at a focal point; and the water jet spraying device is used for spraying high-speed water jet, and the accuracy adjusting device is used for adjusting the water jet axis to enable the water jet axis to coincide with the focal point and adjusting the gesture of the water jet axis to enable the gesture of the water jet axis to coincide with a rotating shaft. According to the five-axis-head water cutting machining device with the accuracy adjusting device, due to the structure, positional deviations of the focal point and an injection point are adjusted, and the machining accuracy influences caused by the deviations are greatly reduced, so that the machining accuracy of the water cutting machining device is improved, and the water cutting machining device has a wider application scope.

The invention discloses a thermoelectric refrigeration grinding wheel and a self-condensation minimal quantity water lubrication precision grinding system with the same. The thermoelectric refrigeration grinding wheel comprises an annular grinding wheel grinding layer, a refrigeration device and a circulation heat dissipation device. Workpieces can be ground by the grinding wheel grinding layer togenerate heat during work. The thermoelectric refrigeration grinding wheel and the self-condensation minimal quantity water lubrication precision grinding system have the advantages that a thermoelectric refrigeration sheet is used as a refrigeration portion, the heat generated during grinding can be transferred to a hot surface by the electrified thermoelectric refrigeration sheet by the aid ofheat pump principles, and heat gathered on the hot surface can be taken away by a circulation heat dissipation system; trace condensed water can be carried to grinding zones under low-temperature condensation effects of the surfaces of the thermoelectric refrigeration grinding wheel, accordingly, minimal quantity lubrication effects can be realized, and self-condensation minimal quantity water lubrication grinding can be implemented; the thermoelectric refrigeration grinding wheel and the self-condensation minimal quantity water lubrication precision grinding system can be mounted on differenttypes of grinding machines including surface grinding machines, cylindrical grinding machines, curved surface grinding machines and the like and can be applied to the different types of grinding machines.

The invention discloses a screw rod supporting device on a planer type milling machine with a moving workbench. The screw rod supporting device comprises a mounting seat, a supporting piece, at least one pair of rollers and an elastic piece, wherein the mounting seat is fixed on a machine tool body; the supporting piece is arranged on the mounting seat in a manner of moving up and down; the rollers are arranged on the supporting piece, and the axle axes of the rollers can extend along the length direction of a screw rod; the elastic piece is arranged between the supporting piece and the mounting seat and can supply an upward elastic resetting force to the supporting piece, so that the circumferences of the rollers can be upwards pressed against the screw rod; the rollers are positioned in the middle of the screw rod or under a position close to the middle of the screw rod; the paired rollers are arranged longitudinally at an interval along the length direction of the screw rod; and the paired rollers are symmetrically arranged transversely according to an upright central line of the screw rod on an upright projection surface of the screw rod. Due to the elastic piece, the rollers elastically support the middle or the position close to the middle of the screw rod, so that bending and flexible deformation of the screw rod are reduced or eliminated; and furthermore, the positioning precision error of the motion of the workbench and the influence on the machining precision of a workpiece are reduced, the positioning precision of a machining shaft of a machine tool is improved, and the stability and the safety of running are improved.

The invention discloses a small self-energy-taking ultrasonic vibration electric spindle, and belongs to the field of vibration cutting. The traditional drilling manner is changed, and the irreplaceable advantages are achieved. The electric spindle comprises an amplitude-change rod, an end cover, piezoelectric ceramics, a circuit box, a first coil, a second coil, a cover shell, a stator, a rotor,an inner shaft and a magnet; the stator, the rotor and the inner shaft are arranged in the cover shell in sequence, the second coil is arranged at one end of the stator, the rotor is fixed to the inner shaft, multiple sets of magnets are arranged at one end of the inner shaft, the first coil is arranged outside the magnet, and pressing is achieved through the end cover; a circuit board connected with the magnet is arranged in the end cover, the end cover is connected with the piezoelectric ceramics through the circuit board, one end of the piezoelectric ceramics is fixed to the amplitude-change rod, and axial reciprocating motion is achieved; the other end of the amplitude-change rod is fixed to the inner shaft. Through the end cover, pressing and fixing to the cover shell are achieved. The electric spindle is small in size, small in whole mass and capable of reducing the influence of the spindle weight on the machining precision, equipment input cost and manual cost.

The invention relates to an intelligent compensation method for realizing non-linear errors of a numerical control machine tool, which comprises the following steps: collecting error source signals, taking machine tool coordinate axis positions as inputs of a fuzzy neural network, collecting error signals as outputs of the fuzzy neural network, and training the fuzzy neural network; performing PLCerror table calibration by using a fuzzy neural network to generate a PLC error table; enabling the PLC thread to collect an error source signal for real-time compensation, enabling the motion control module to collect a real-time machine tool coordinate axis position and store the real-time machine tool coordinate axis position in the shared memory, and enabling the PLC to determine an error value of a current to-be-compensated shaft by reading the real-time machine tool coordinate axis position in the shared memory and through a linear difference value of the PLC error table; and performingerror compensation on the current to-be-compensated shaft through the obtained error value. According to the method, the influence of nonlinear error factors on the machining precision of the numerically-controlled machine tool is reduced, the robustness and machining stability of system error compensation are improved, the real-time performance of motion control of the numerically-controlled machine tool is improved, and the method has important theoretical significance for achieving high-speed and high-precision machining.

The invention provides a special tool for processing the end surface of a bearing cover. The special tool comprises a die holder, wherein the upper end surface of the die holder is connected with a rotating module, and the periphery of the bottom end of a pin shaft positioned in the rotating module is orderly sleeved with a plane bearing and a belleville spring; the bottom end of the pin shaft penetrates through the die holder to be connected with a locknut; the rotating module rotates round the pin shaft on the die holder and is positioned with the die holder through a positioning bolt; the upper end of the rotating module is connected with a central stud, the central stud is movably sleeved with a backing plate and a pressing plate, and a flanged nut is arranged at the top end of the central stud; a positioning column used for positioning the outer wall of the rotating module is clamped on the die holder positioned outside the rotating module. The special tool adopts the 180 degrees of rotation of the rotating module to meet the processing of the two parallel surfaces of the bearing cover, therefore realizing the purpose that one-time clamping meets the processing of two working procedures, greatly improving the processing efficiency and precision, and avoiding a repetitive position error.

A machining center spindle box with an internal circulation cooling system comprises a spindle box body. An inlet pipe connector and an outlet pipe connector are designed on the spindle box body. A cooling liquid passage is designed in the lateral wall of the spindle box body, one end of the cooling liquid passage is communicated with the inlet pipe connector, and the other end of the cooling liquid passage is communicated with an outlet pipe connector. The left side of the lateral wall of the spindle box body is connected with a left sealing plate in a sealed mode, and the right side of the lateral wall of the spindle box body is connected with a right sealing plate in a sealed mode. The cooling liquid passage is a circular cooling liquid passage.

The invention discloses an efficient precision machine tool with waste liquid capable of being recycled. The precision machine tool comprises a grinding machine body, wherein one side of the grindingmachine body is connected with a cutting fluid storage box, a waste fluid box is arranged on one side of the cutting fluid storage box, a multi-stage cutting fluid impurity removal mechanism is arranged on the side, away from the grinding machine body, of the waste fluid box, the multi-stage cutting fluid impurity removal mechanism comprises a waste fluid treatment box, a liquid inlet pipeline isconnected to the side, close to the cutting liquid storage box, of the waste liquid treatment box, a waste liquid extraction pump is connected to the end, away from the waste liquid treatment box, ofthe liquid inlet pipeline, and a waste liquid extraction pipeline is connected between the waste liquid extraction pump and the waste liquid box. According to the efficient precision machine tool, byadditionally arranging the corresponding multi-stage cutting fluid impurity removal mechanism on the precision grinding machine tool, the recycling efficiency of the cutting fluid of the precision grinding machine is remarkably improved, the situation that the recycling effect of the cutting fluid is poor due to insufficient impurity removal is avoided, the influence of the cutting fluid on the machining precision of the precision grinding machine tool is greatly reduced, and the service life of the precision grinding machine tool is prolonged.

The invention discloses a vehicle sealing strip skeleton, and relates to the field of automobile sealing parts. The vehicle sealing strip skeleton comprises a stretching belt, a plurality of bone pieces are arranged symmetrically on the two sides of the stretching belt in an arrayed manner, gaps are arranged between the adjacent bone pieces, the stretching belt is provided with a plurality of middle holes in the length direction, and side holes are formed in the two sides of the part, between every two adjacent middle holes, of the stretching belt. In order to solve the problems that in the prior art, the utilization rate of raw materials is low, the production efficiency is insufficient and the production cost is high, the two sides of the stretching belt are provided with bone strips, the middle holes, the side holes and the gaps are formed through the stretching belt having the stretching effect, waste of the raw materials can be greatly reduced, and the production efficiency of thevehicle sealing strip skeleton can be improved.

The invention relates to storage equipment for mold sealing. The storage equipment comprises a vehicle body, and a storage box arranged on the vehicle body. Sealing cover plates are symmetrically distributed on the storage box; and a fixed frame is mounted in the storage box. The storage equipment also comprises a turnover mechanism connected with the sealing cover plates and capable of enabling the sealing cover plates to be opened and closed, and a limiting mechanism distributed opposite to the turnover mechanism and installed on the storage box in a sliding mode. The turnover mechanism is connected with a crossed belt transmission mechanism installed on the storage box and a motor connected with the crossed belt transmission mechanism and installed on the storage box. Manual mold transportation is replaced by mold transportation through the storage vehicle, so that labor intensity is greatly reduced, and labor cost is reduced; shock absorbers and shock absorption springs are arranged between fixing frames, so that damage to the mold due to collision in the transportation process is effectively avoided, and the influence of transportation loss on the machining precision is reduced; and air in the storage box is exhausted through a vacuum pump, so that the situation that the machining precision is reduced due to the fact that the die is corroded in the idle process is avoided.

The invention discloses a ram component on a processing machine tool. The ram component comprises a ram, a ram base, a jacket, a main shaft and a rotary driving mechanism, wherein the ram and the ram base are connected in a sliding fit manner, and the jacket is arranged at one end of the ram. As the ram adopts the thermal symmetrical structure of an axially hollow cylinder, the influence of thermal deformation on the processing precision of the machine tool can be reduced. The rotary driving mechanism directly drives the main shaft to rotate, so that the traditional mode that the main shaft is driven mainly by an external motor through a speed reduction box can be changed, and further the processing precision of the machine tool can be improved.

The invention discloses a generating tool power head structure, and relates to the field of machine tool parts. The generating tool power head structure mainly comprises a main shaft, a screw rod, a sliding block, a generating tool cutterhead and a main shaft box body, wherein the main shaft is supported on a main shaft box body through two main shaft bearings, and an external driving mechanism drives the main shaft to rotate through a driving belt wheel to drive a tool on the generating tool cutterhead to rotate; a sliding block which can move back and forth along the axial direction of the main shaft is arranged in the center of the generating tool cutterhead, inclined tooth structures on the two sides of the sliding block drive a radial tool body sliding rail to move radially, and the cutter body sliding rail drives the tool installed thereon to achieve radial adjustment of the tool. The generating tool power head structure has the beneficial effects that the structure is simple, the main shaft conforms to the machine tool standard, the automatic lubricating function is achieved through a rotary oil distributing end, the generating tool driving rigidity is extremely high, and the guarantee is provided for high precision and large margin cutting, the heat influence of a generating tool driving mechanism and the main shaft is extremely small, the influence on machining precision is extremely small, and subsequent measurement compensation requirements can be greatly reduced on the control of a generating tool.

The invention discloses a method for machining a stepped hole with a large depth-diameter ratio. The method comprises the following steps: 1, measuring the aperture of n equidistant sections of a machined hole section and the corresponding Z-direction coordinates; 2, calculating the minimum machining allowance delta 1 and the maximum machining allowance delta 2; 3, judging whether the section aperture is within the dimensional tolerance or not; 4, judging the shape of an inner hole; 5, determining the movement track of a grinding wheel according to the shape of the inner hole; 6, carrying outreciprocating grinding m circles through the grinding wheel along the movement track; 7, measuring the aperture at the n equidistant sections of the machined hole section and the corresponding Z-direction coordinates, and calculating the minimum machining allowance delta 1 and the maximum machining allowance delta 2; 8, judging whether EI-ES,delta 1<=0 and 0<=delta 2<=ES-EI are met or not, if yes,carrying out the step 9, and if not, carrying out the step 3; and 9, completing the machining. According to the finishing machining method, measurement and finishing integrated machining is adopted,precise finishing machining of inner holes of three typical parts can be achieved, the shape precision of inner holes is guaranteed, the trimming time of inner holes is shortened, and the production efficiency and the consistency of part are improved.

The invention discloses an automatic bearing polisher. The automatic bearing polisher comprises a polisher body, wherein a polishing mechanism is connected to the polisher body, a cooling liquid circulating mechanism is arranged on the polishing mechanism, a recovery mechanism is connected to one side of the polisher body, a metal impurity filtering mechanism is connected to one side of the recovery mechanism, the metal impurity filtering mechanism comprises a rotary shaft, a rolling bearing and a bearing end cover which are matched with the rotary shaft are connected between the rotary shaftand the recovery mechanism, a magnetic rotary shaft is arranged at the outer side of the rotary shaft, a scraping plate matched with the magnetic rotary shaft is arranged at the side, away from the cooling liquid circulating mechanism, of the magnetic rotary shaft, and a slag box is arranged at the side, away from the magnetic rotary shaft, of the scraping plate. According to the automatic bearingpolisher, by adding a corresponding filtering device, used cooling liquid is subjected to multi-stage filtration, the cooling liquid filtering effect is improved, the situation of cooling pipeline blockage is reduced, the influence on bearing machining precision is lowered, and working efficiency is improved to a certain extent.

The invention relates to an oil pipe connector machining device and method. The oil pipe connector machining device comprises a rotating disk. Six machining stations are evenly and circumferentially distributed along the rotating disk. Each machining station is provided with a clamping mechanism used for clamping material pieces. Six machining mechanisms are sequentially arranged on the outer side of the rotating disk in a surrounding manner. The six machining mechanisms correspond to the machining stations in a one-to-one manner in position. The rotating disk can rotate around the center axis. The rotating disk rotates by 60 degrees every time. The oil pipe connector machining device further comprises a feeding mechanism. The feeding mechanism is fixed to the bottom of the rotating disk and used for feeding materials to the clamping mechanisms. By the adoption of the oil pipe connector machining device, machining of all the dimensions of an oil pipe connector is completed, materials are saved, a metal streamline is kept complete, and the strength of the part is improved; and meanwhile, the six machining mechanisms work at the same time, so that the work efficiency is improved, and the production cost is reduced.

The invention discloses a machining method for grinding short holes by large-length-diameter-ratio weak-rigidity grinding rods, and belongs to the technical field of precise grinding. The machining method comprises the following steps: (S1) apertures of orifices, middle points and bottoms of machined hole sections are measured; (S2) the efficient cutting and grinding are performed; (S3) the efficient-grinded apertures are judged if reaching a set diameter range; (S4) the small-cutting-depth reciprocating grinding is performed; (S5) the precise-grinded apertures are judged if meeting the size requirements; (S6) the morphology of a grinding wheel is finished; (S7) a motion trajectory of the grinding wheel is determined; and an interpolation method is used for grinding; and (S8) the interpolation method is applied to polish the apertures until the size requirements are met. The machining method realizes efficient removal of materials by normal grinding pretightening force between the grinding wheel and workpieces during grinding through adjustment of prebending deformation of the grinding rods during grinding, realizes high-quality and high-efficiency precise grinding of the short holes of large-length-diameter-ratio parts through the morphology change of the grinding wheel, and improves the machining precision and quality and the production efficiency of the short holes.

The invention relates to the technical field of laser cutting equipment, and discloses an optical fiber laser cutting equipment. The optical fiber laser cutting equipment comprises a cutting head anda focusing lens, wherein the focusing lens is fixedly installed at the bottom of the cutting head, a connecting conical ring is fixedly installed at the bottom end of the cutting head, the bottom of the connecting conical ring is fixedly provided with arc-shaped baffles, and the outer side of the cutting head is in threaded connection with a fastening conical ring. According to the optical fiber laser cutting equipment, the diameters of cylindrical sections of cutting light penetrating through the inner diameters are changed by changing the inner diameters of the three arc-shaped baffles, thena to-be-machined part is erected, so that the cylindrical section of the cutting light is in contact with the workpiece, and the influence on the machining precision due to the taper of the cutting light can be reduced when the thicker workpiece is cut.

The invention discloses a hard rail type gantry numerical control milling machine, which comprises a workbench main body, a portal frame, and a processing device; the portal frame comprises a first supporting pillar and a second supporting pillar, and a cross beam; the first supporting pillar and the second supporting pillar are fixed at the left side and the right side of the workbench main body,and connected to both ends of the cross beam through a synchronous moving device; the processing device comprises a first Z-axis device and a second Z-axis device arranged on the cross beam; the cross beam is provided with a first lead rail, fixed at the front end face of the cross beam, a second lead rail, and a third lead rail on the upper end face of the cross beam; the first, second and thirdlead rails are gliding hard rails of which sections are in the shape of reversed V. The hard rail type gantry numerical control milling machine is simple and reliable in structure, and the gliding hard rail integrally casted with the machine tool is used as the moving lead rail, and can bear big load; the contact area of the lead rail is big, and the machine tool running is more stable; thus theinfluence of the vibration of the machine tool on the processing precision is reduced, and the maintenance cost is low.

The invention discloses a high gain holographic impedance modulation surface antenna design method and an antenna. The method comprises steps of S1, establishing a model of a lattice unit based on a circular metal patch; S2, fitting the mathematical relationship between a geometric parameter and a surface impedance value between a distance g of a circular metal patch from an edge of the lattice unit and the surface impedance Z; S3, obtaining surface impedance distribution of the holographic impedance modulation surface; and S4, calculating a parameter value of the circular metal patch of the holographic impedance modulation surface and establishing a model of the entire holographic impedance modulation surface. The method is advantaged in that through the holographic impedance modulation surface antenna form of the step structure, the gain of the antenna can be effectively improved, radiation deviating from the normal direction is realized, overall performance of the antenna is improved, moreover, the holographic impedance modulation surface antenna has a planar structure, no additional introduction of a feed source and the feed network is required, the structure is simple, bandwidth is wide, and radiation deviating from the normal direction can be further realized.

The invention discloses a clamp used for turning of threads of perpendicularly intersecting shafts. A supporting surface of an annulus body is formed by the cambered surfaces of two rib plates jointly. An opening in the circumference of the annulus body is located between the two rib plates. A connecting surface on the circumferential surface of a positioning ring makes contact with the surface of a clamping plate and is fixed to the surface of the clamping plate. The lower surface of the positioning ring makes contact with the upper end face of the annulus body and is fixed to the upper end face of the annulus body. A positioning stopping opening in the upper surface of the positioning ring is used for mounting of a workpiece. A bottom plate is welded and fixed to the lower end face of the annulus body, and the plane on the circumference of the bottom plate corresponds to the opening in the circumference of the annulus body in position. Through the clamp, the effect that the threaded rotation shaft is shifted to be coaxial with a lathe spindle is achieved, meanwhile, thread machining operation is facilitated, clamping deformation and turning tremble are avoided, the tool manufacturing difficulty and cost are lowered, and the defects in the prior art are overcome.

The invention discloses a telescopic workbench, and relates to the technical field of workbenches. The telescopic workbench comprises a fixed seat, two translation tables moving face to face or back to back are installed on the fixed seat, the bottoms of the two ends of the translation tables are fixedly connected with first supporting blocks and second supporting blocks respectively, and the first supporting blocks are slidably connected to the fixed seat; supporting wheels are arranged at the bottoms of the second supporting blocks, and a first driving mechanism for driving the translation tables to move horizontally is mounted on the translation tables; and a first accommodating cavity is formed in the fixed seat, a lifting table is arranged in the first accommodating cavity, and a second driving mechanism for driving the lifting table to vertically move is arranged in the first accommodating cavity. The telescopic workbench solves the technical problem that in the prior art, the production efficiency is low due to production procedure conversion, improves the procedure conversion efficiency, lowers the influence on the machining accuracy in the technical transformation process,and meanwhile has the advantage of quickness and convenience in adjustment.

The invention relates to the technical field of numerical control machine tools, in particular to a high-precision numerical control machine tool comprising an integrated portal frame. The integrated portal frame comprises a body. The body is provided with a cross beam portion and two supporting leg portions. The cross beam portion is provided with an upper supporting table, a lower supporting table, a motor seat, a main end bearing seat and a tail end bearing seat, wherein the upper supporting table and the lower supporting table are provided with an upper sliding rail portion and a lower sliding rail portion correspondingly, the upper supporting table and the lower supporting table extend in the horizontal direction, a plurality of rib portions shaped like the Chinese character 'mi' are arranged between the upper supporting table and the lower supporting table side by side, every two adjacent rib portions shaped like the Chinese character 'mi' are mutually connected, and a reinforcing rib extending vertically is arranged between every two adjacent rib portions shaped like the Chinese character 'mi'. The motor seat, the main end bearing seat and the tail end bearing seat are provided with installation holes correspondingly. Each supporting leg portion comprises a hollowed portion and a leg portion, wherein the hollowed portion comprises two portions shaped like the Chinese character 'mi', the two portions shaped like the Chinese character 'mi' are parallel to each other, and a connecting rib is arranged between the two portions shaped like the Chinese character 'mi'. The high-precision numerical control machine tool can absorb certain vibration, reduce the influence of the vibration on machining precision and improve the machining precision.

The invention provides a precise grinding device for the inner surface of a steel tube. The device comprises a walking mechanism, a throw rod, a throw rod driving mechanism and a shock absorbing mechanism, wherein the walking mechanism comprises a track and a trolley, walking wheels rolling along the track are arranged at the lower end of the trolley, and a walking driving motor which drives the walking wheels to rotate is arranged on the trolley; a mounting rack is arranged on the trolley, a clamp for fixing the throw rod, a driven wheel located on the end part of the throw rod and a main motor which drives the driven wheel to rotate are arranged on the mounting rack, and the throw rod is arranged parallel to the track. The device can process two steel tubes simultaneously and is compactin structure and good in processing stability and uniformity, and the inner walls of the steel tubes are not damaged.