50results about How to "Achieve machining accuracy" patented technology

The invention relates to an external thread turning process, in particular to a coarse-pitch external thread layered turning process. The process aims at solving the problem that by means of existing thread turning methods, because the requirements for massive removal and high-precision machining of coarse-pitch external threads can not be met, thread surface machining principle errors and cutter marks exist in coarse-pitch external thread turning, the problem that because of the overlarge cutting load, cutter abrasion is quick, and the problem that because of staggered threads and an excessively large number of layered cutting times caused by cutter starting point error accumulation, the machining efficiency is low is solved. The process includes the process of conducting rough machining by removing thread rough machining allowance through multiple cutting edges in a radial continuous multi-time feed layered cutting mode and a left-right axial multi-time layered cutting mode, and the process of conducting semi fine machining and fine machining in a layered cutting mode by feeding the left cutting edge and the right cutting edge alternately multiple times in the axial direction. The requirements for the machining precision and the machining surface quality of external threads are met, obtained left and right threaded faces are free of cutter marks, the problem that threads are meshed in disorder is solved, and the requirement for efficiently turning coarse-pitch external threads in a high-quality mode is met.

The invention discloses an ultrahigh precision processing method for a meter-scale optical element. According to the method, an annular polishing technology and a magneto-rheological polishing technology are combined, and different processing technical parameters are subjected to optimal combination to realize the ultrahigh precision processing of the meter-scale optical element. According to the method, the meter-scale optical element of which the PV (pageviews) value of surface figure accuracy is 1/8 wavelength and the RMS (rate-monotonic scheduling) value is 1/50 wavelength is processed.

The invention provides a grain processing smashing device for an agricultural machine. The grain processing smashing device comprises a rack. A pretreatment system and a finish processing system are sequentially arranged in the rack from top to bottom. The pretreatment system comprises multiple levels of extruding mechanisms arranged side by side. The finish processing system comprises a smashingand grinding mechanism, a screening mechanism, a spiral conveying mechanism and a material receiving mechanism. The grain processing smashing device for the agricultural machine is simple in structureand convenient to use, grain raw materials enter the multiple levels of extruding mechanisms from a feeding pipe to be subjected to extruding pretreatment, then the grain raw materials are subjectedto finish processing through the smashing and grinding mechanism and the screening mechanism, the grain raw materials are fully smashed, ground and screened, the screening efficiency is high, the grinding effect is good, the ground grain raw materials are collected through a collecting tank, the labor intensity of workers is reduced, the working efficiency is improved, the grain raw materials which are obtained after finish processing and do not conform to the standard are returned to the smashing and grinding mechanism through the spiral conveying mechanism to be subjected to secondary smashing and grinding until the grain raw materials conform to the standard, and then grain raw materials fall into the collecting tank through the screening mechanism to be collected.

The invention provides a passive clamping type piezoelectric actuator and relates to a piezoelectric actuator. The invention aims to solve the problems that the adjustment of the pretightening force of the existing passive clamping type piezoelectric actuator is controlled in cooperation with interference, so the control flexibility is poor, and the structural type of the clamping amplification structure is complex. The passive clamping type piezoelectric actuator provided by the invention comprises a first clamping mechanism, an actuating mechanism, a second clamping mechanism and a guide rail, wherein the first clamping mechanism and the second clamping mechanism are arranged in sequence from right to left, and the guide rail penetrates through the middle parts of the first clamping mechanism and the second clamping mechanism in sequence, and the actuating mechanism connects the first clamping mechanism and the second clamping mechanism. The passive clamping type piezoelectric actuator provided by the invention has small size and can realize self-locking when a power failure occurs, a clamping device is provided with a triangle amplifying mechanism, which can amplify the displacement of a clamping piezoelectric stack, thus reducing the difficulties of processing and assembling. The passive clamping type piezoelectric actuator is applied to the micro drive process.

The invention relates to the field of machining machinery, in particular to a never-worn milling machine, and belongs to machining equipment for machining refractory materials and nonmetallic materials. The milling machine comprises a gantry framework, a milling head mechanism and a worktable guide rail, wherein one side of a cross beam on the gantry framework is connected with the a lifting transmission mechanism in an upright post; a sliding plate base connected on the other side of the cross beam through a left-and-right transmission mechanism is connected with the milling head mechanism; the lower part of the milling head mechanism corresponds to a workpiece on the worktable guide rail mechanism; replaceable wear-resistant belts are installed at sliding fit positions of the upright post and the cross beam, the cross beam and the sliding plate base, and a worktable and a guide rail respectively; the replaceable wear-resistant belts can be wear-resistant soft belts, wear-resistant steel belts or wear-resistant nodular iron castings. The never-worn milling machine solves the problems that the conventional milling machine has certain wear at work and thus the accuracy cannot meet technical requirements; the never-worn milling machine can reduce the maintenance cost and can ensure the machining accuracy for a long time.

The invention discloses a method for preparing a hollowed structure on the surface of a transparent material and in the transparent material, and belongs to the technical field of femtosecond laser micro-nano machining. According to the method, the polarization and machining power is precisely controlled, a modified area with the precision of hundreds of nano is directly written in the transparentmaterial in a femtosecond laser direct writing manner, then the surface of the transparent is thinned to the machining area position (surface machining) in a mechanical/ion beam thinning manner, finally the material is etched through a wet etching process, and preparation of the hollowed structure with high precision, any patterned structure and the precision of hundreds of nano is achieved. According to the method, efficient high-precision machining of multiple common transparent materials can be achieved in a vacuum environment, and the problems that in the prior art, the requirement for the environment is high, and the machining efficiency is low are solved.

The invention discloses a manual rounding device. The device comprises a supporting base, a rotary shaft installed on the supporting base, a handle and a positioning block, wherein the handle and the positioning block are installed at the two ends of the rotary shaft respectively, the front surface of the positioning block is flat, two positioning plates which are perpendicular to the positioning block and extend forwards are formed on the edge of the front surface of the positioning block, an angle is formed between the two positioning plates, an installation site which deviates from the rotary shaft and is used for accommodating a workpiece to be machined is formed on the front side of the positioning block by the two positioning plates, and a positioning mechanism used for fastening the workpiece to be machined is arranged in the installation site. The manual rounding device is used in cooperation with a widely used flat grinder, and after the workpiece is well positioned on the installation site, the position of a grinding wheel of the flat grinder is adjusted and the workpiece is made to rotate around the rotary shaft, so that rounding is achieved easily. By the adoption of the device, the machining precision of current professional equipment can be realized, instability caused by manual rounding is avoided, no professional rounding equipment is needed, and increase of machining cost is avoided.

Provided is a gear machining machine which has a cutter head with improved rigidity, and contributes to improving machining accuracy and making quality uniform when either an external gear or an internal gear has been machined. For this purpose, the gear machining machine is equipped with a movement base (12) that is movably supported and rotatably supports a rotation table (13) on which an external gear (W1) or an internal gear (W2) is mounted; a bridge section (14c) of a gate-shaped column (14) provided at a location above the movement base (12); a saddle (15) which is supported by the bridge section (14c) in a vertically movable manner; and a cutter head (16) which is provided on the front surface of the saddle (15), and the lower end of which rotatably supports a tool (T). A protrusion (16a) which projects forward is provided on the front surface of the cutter head (16). The tool (T) is disposed in such way that the front thereof protrudes further forward of an end surface (16b) which is the most forward projecting portion of the protrusion (16a).

The invention provides a large-pitch thread turning tool design method. According to the technical main points, the method comprises the steps of (1) determining a process scheme and a procedure cutting method according to structure characteristics of a processed large-pitch thread workpiece and setting a cutting tool with a basic tool structure suitable for turning the large-pitch thread workpiece, wherein the basic tool structure of the cutting tool comprises a tool cutting edge structure and parameters thereof; (2) carrying out tool cutting interference checking, if interference does not exist, determining a cutting experiment on the workpiece by using the cutting tool; (3) inputting a cutting scheme to turn the workpiece and obtaining a tool vibration signal and a rear tool surface abrasion image of the tool; and (4) evaluating the cutting scheme of the cutting tool by taking the dynamic load consistency of left and right edges of the cutting tool, the left, right and back tool surface abrasion consistency of the cutting tool, the processing precision of left and right thread surfaces of the workpiece and the processing surface quality consistency as design objectives. According to the large-pitch thread turning tool design method, the loads of the left and right edges of the tool are improved; the abrasion is reduced; the consistency is good; and the processing quality of the workpiece is improved.

The invention relates to a special tool clamp for a wind driven generator one-piece bearing pedestal casting and a machining technology and belongs to the technical field of mechanical part machining. The special tool clamp comprises a box, a positioning device, a pressing device, an adjusting device and a supporting device. According to the special tool clamp for the wind driven generator one-piece bearing pedestal casting, a one-piece bearing pedestal lies one side to be clamped on the special tool clamp, a rotating workbench, bearing pedestal holes, a blast hole, an end face and peripheral faces complete finish machining through one time of clamping, the cylindricity and the coaxiality of the bearing pedestal holes in the two ends are guaranteed, the overturning frequency of the casting is reduced, the machining precision required in graph paper is achieved, production efficiency is improved, and production cost and labor intensity of workers are reduced.

The invention provides a homogenization method of chipping allowance and a periphery grinding apparatus of a plate, and relates to an apparatus for grinding a glass substrate of a display panel of a portable terminal and peripheries of other plates, even in a polar coordinate system, the grinding apparatus can automatically set a corrected value for homogenizing chipping allowance of a workpiece at the whole periphery of the workpiece. Before processing and after processing the workpiece held on a workbench, images of predefined periphery portions at more than three positions of the workpiece are acquired by using a camera, differences of positions of sides of the workpiece before processing and after processing at the periphery portions of each position are detected, a corrected value for homogenizing the differences of the positions of the sides at the periphery portions at more than three positions is calculated, and the corrected value is set to a controller. The controller uses the set corrected value to correct instruction values provided to a spindle motor driving the workbench to rotate and a feed motor of a grinding wheel.

The invention relates to a stamping die in the field of machinery, in particular to a punching and flattening die for producing automobile covering parts. The punching and flattening die comprises a base plate, a clamping-punching device and a flattening device, wherein the clamping-punching device and the flattening device are arranged on the base plate, the clamping-punching device comprises upper die plates and lower die plates which are vertically arranged, the upper die plate and the lower die plate are each provided with a semicircular groove, and a puncher pin is arranged on the upper die plate. The flattening device comprises a lower die, an upper die, a stamping slide block, a flattening slide block, a flattening puncher pin and a spring, a sliding way in a shape of a Chinese character 'ao' is formed in the lower die, the flattening slide block is movably fixed to the sliding way in the shape of the Chinese character 'ao', one end of the spring is connected to the flattening slide block, the other end of the spring is fixed to the lower die, and the stamping slide block is arranged on the upper die. The punching and flattening are simultaneously performed through a set of the die, and the machining precision and production efficiency of products are greatly improved.

The invention discloses an optical fiber clamp and a fusion splicer, and belongs to the field of optical fiber fusion splicers. The optical fiber clamp comprises a pressing plate cover and a base, the pressing plate cover is hinged to the base, the upper end face of the base is provided with an optical fiber groove penetrating through the end faces of the two sides of the base, the middle of the pressing plate cover is provided with a special-shaped hole suitable for a special optical fiber connector, and the pressing plate cover covers the upper side of the optical fiber groove of the base; a magnet capable of being attracted with the pressing plate cover is embedded in the position, corresponding to the pressing plate cover, of the upper end face of the base, and a limiting hole is further formed in one side of the base; and the optical fiber clamp is installed on the base of the optical fiber fusion splicer, the second magnet of the clamp base is integrally attracted to the base of the optical fiber fusion splicer, and the limiting hole of the clamp base is matched with the limiting pin of the base of the optical fiber fusion splicer. The requirement for reliable positioning of the special connector optical fiber is met, the optical fiber can enter the groove quickly, and it is guaranteed that the optical fiber is not dislocated.

The invention discloses an annular polishing surface shape accurate adjustment method for plate type optical components. According to the annular polishing surface shape accurate adjustment method forthe plate type optical components, the variation of reflection/transmission surface shapes is adjusted by using the thermal deformation of the plate type optical components during the course of annular polishing and accordingly the rapid and controllable conversion of the heights of the surface shapes of the components can be made during the surface shape preserving period of a polishing mould, so that the annular polishing reflection/transmission wavefront distribution control efficiency of the plate type components can be greatly improved. The method is particularly applicable to the platetype optical components which are large in thermal expansivity and prone to deform, such as laser neodymium glass sheet-shaped components with the caliber of 400 mm, so that the uncertainty of surfaceshape control can be effectively overcome during the annular polishing course of the plate type components, the machining accuracy of the meter-scale plate type optical components can be realized, the surface shape PV is superior to 1/5 lambda (lambda=632.8 nm) and GRMS is superior to 1/90 lambda.

The invention discloses a roughing and finishing integrated hard alloy dry-cutting hob and belongs to the technical field of gear machining tools. The roughing and finishing integrated hard alloy dry-cutting hob comprises a hob body, a roughing hob set and a finishing hob set, wherein the center of the hob body is provided with a hob locating hole in the axial direction; the hob body, the roughinghob set and the finishing hob set are all made of hard alloy, the inner wall of the hob locating hole is provided with a key groove in key connection with a hobbing machine tool spindle, the roughinghob set and the finishing hob set are detachably and fixedly connected to the hob body respectively, multiple V-shaped roughing hob chip containing grooves are uniformly distributed in the outer circle surface of the roughing hob set, multiple V-shaped finishing hob chip containing grooves are uniformly distributed in the outer circle surface of the finishing hob set, a roughing front cutting edge and a roughing side cutting edge are arranged on the front surface of each roughing hob blade in the roughing hob set, and a finishing front cutting edge and a finishing side cutting edge are arranged on the front surface of each finishing hob blade in the finishing hob set. The hob is used for roughing and finishing of a gear.

The invention belongs to the field of signal communication towers and particularly relates to an anti-climbing signal tower. The anti-climbing signal tower comprises a climbing unit, a steel wire rope, a tensioning unit and a winding unit, wherein the tensioning unit, the climbing unit and the winding unit are sequentially arranged on the right side of the signal tower from top to bottom. The steel wire rope is connected between the tensioning unit and the climbing unit, and the climbing unit comprises a climbing plate, a limiting unit and a first box. The winding unit is fixedly connected with a fixed head through the steel wire rope; the tensioning unit is used for automatically tightening the steel wire rope; the winding unit is used for downwards pulling the steel wire rope; the steelwire rope drives the fixed head to downwards move to enable a connecting rod to push a sliding block to rightwards move; and a locking unit in the winding unit can limit working of the winding unit. The anti-climbing signal tower is mainly used for climbing of the cylindrical signal tower, the climbing unit can be controlled in a hand-operated mode, and meanwhile a constructor controls the lockingunit to lock the climbing unit through a key to prevent climbing of the signal tower by non-staff.

A double-headed machine tool comprises a stand column machine base set which is provided with a first linear rail, a second linear rail and a third linear rail arranged between the first linear rail and the second linear rail; two feeding driving sets arranged on the stand column machine base set, each feeding driving set being provided with a driving motor and a screw rod which is driven by the motor to rotate; a first head provided with a first sliding block matched with the first linear rail in a sliding manner, a second sliding block matched with the third linear rail in a sliding manner, a screw barrel matched with the screw of one feeding driving set in a threaded manner, and a main shaft unit; a second head provided with a first sliding block which is matched with the second linear rail in a sliding mode, a second sliding block which is matched with the third linear rail in a sliding mode, a screw barrel which is matched with the screw rod of the other feeding driving set in a threaded mode, and a main shaft unit.

The invention provides a workpiece clamping device. The workpiece clamping device comprises a bottom plate and bases and is characterized in that the periphery of the bottom plate is equidistantly provided with three sets of the bases in a same circumference, the upper end of each base is provided with a built-in connection rod, each connection rod is provided with upper and lower two pairs of support seats, each support seat is provided with left and right two pairs of clamping heads, the bases are connected with the corresponding connection rods through circumferential base connection shafts, and the connection rods are connected with the corresponding support seats through axial support seat connection shafts. By means of the workpiece clamping device, the problems that present lathe clamping devices are strenuous to align workpieces and low in efficiency are solved, and the workpiece clamping device particularly adapts to assembly and use for clamping cylindrical workpieces in thenumerical control lathe machining process.