766results about How to "Improve machining accuracy" patented technology

A numerical control electrolytic-mechanical composite machine tool comprises a machine body, a frame, a horizontal work bench, a numerical control double-revolving work bench, a protection box, a spindle head, an electrical spindle, a numerical control system, a pulse power supply, an electrolyte circulating device, and an X-direction transmission mechanism, a Z-direction transmission mechanism as well as a Y-direction transmission mechanism, wherein the electrical spindle, the pulse power supply, an electrolyte pump of the electrolyte circulating device, an X-direction servo motor, a Z-direction servo motor, a Y-direction servo motor, and a B revolving motor and a C revolving motor of the numerical control double-revolving motor are all controlled by the numerical control system. By controlling the relative movement of a composite cathode and an anode workpiece, the machine tool can process mold cavities and mold surfaces for complex workpieces, thus processing workpieces of different shapes. By changing different composite cathodes and adjusting different processing parameters, rough processing, finish processing and surface smoothing of one part can be achieved by one machine tool in different processing manners such as drilling, milling, cutting, grinding and polishing, thus eliminating installation error caused by repeated installation of workpieces.

The invention discloses a punching machine with an automatic feeding function. The punching machine with the automatic feeding function is characterized in that the punching machine comprises a punching mechanism, a control device, a feeding machine frame and an automatic feeding mechanism arranged on the feeding machine frame, the automatic feeding mechanism comprises a carrying roller installed on the feeding machine frame, a linear guideway, and a traveling mechanism arranged on the linear guideway, a clamping mechanism is arranged on the traveling mechanism, the traveling mechanism comprises a trailer wagon and a servo motor driving the trailer wagon to move along the linear guideway, the servo motor is connected with the control device, the control device controls the moving state of the trailer wagon, the punching mechanism comprises a supporting platform, a pressing cylinder, an upper puncher pin, and a lower die core arranged in the inner cavity of a sectional material, a recess corresponding to the upper puncher pin is formed in the upper surface of the lower die core, a die inner core pulling rod is arranged on the feeding machine frame, the lower die core is fixed at one end of the die inner core pulling rod, and the die inner core pulling rod is parallel to the linear guideway and penetrates through the trailer wagon. The punching machine with the automatic feeding function is simple in operation, high in production efficiency, and high in product accuracy.

The invention discloses a self-adaptive compensation method for detecting the turning error of a large part of a rotary body, comprising the steps of: rough machining the part of the rotary body; measuring the radius of intersection of two adjacent contour line segments on an axial section of an inner hole of the part of the rotary body and en extent of error delta 1 of the radius of the two end points by a probe, performing semifinishing for the rough machined part of the rotary body, performing semifinishing for the semifinishing lathe tool by machining trajectory intersection and two end points with theoretical machining radius which is X1-delta 1/2, measuring the actual radiuses of the intersection (A) and two end points (A1) in the step 2) after semifinishing to obtain an extent of error delta1' of semifinishing; performing finish machining, wherein that finish machining lathe tool, the main shaft rotary speed of the tool and the feeding speed are identical to those of semifinishing. In the process of finish machining, a numerical control system of the lathe compensates the extent of error delta 1' of semifinishing. The invention solves the problem that in the machining process the machining error caused by tool wear exists, thereby greatly improving the machining precision of the large part of the rotary body.

The invention provides a laser marking machine. When a workpiece is processed, a detecting instrument is driven to locate in different positions of a three-dimensional coordinate system through a three-dimensional mobile platform, and a voice coil motor is enabled to move, so that laser beams are respectively focused on the detecting instrument. Therefore, a correction table for the displacements of the voice coil motor can be obtained through recording the coordinate information of the different positions and the corresponding displacements of the voice coil motor when the laser beams are focused in the different positions. When the workpiece is marked, the three-dimensional mobile platform is dismantled, and the workpiece is put on a bearing table. A controller controls the voice coil motor to move according to the correction table and the coordinate information of light spots of the laser beams in the three-dimensional coordinate system, so that the laser beams are focused on the surface of the workpiece. Therefore, the laser marking machine and a marking method thereof can reduce the distortion so as to effectively improve the processing precision. In addition, the invention further provides a laser marking method.

The invention relates to a small five-axle-linkage numerical control milling machine, relating to a small numerical control milling machine. The invention aims at problems of conventional-size precise machine tool during cutting process of tiny parts, including large machine tool volume, high processing cost, low efficiency, uneconomical energy and space consumption and difficulties in the processing of complex tiny parts of three-dimensional camber structure. A portal frame-typed machine body is fixed on a base; and X-axis servo driving assembly is fixed on the portal frame-typed machine body; the upper end surface of the base is fixed with a Y-axis servo driving assembly; a Z-axis panel is connected with the X-axis servo driving assembly; a Z-axis servo driving assembly is fixed on the Z-axis panel; an electric principal shaft is fixed on the Z-axis servo driving assembly; a cylinder is connected with the Z-axis servo driving assembly; a microscope is connected with the Z-axis servo driving assembly; a working turntable provided with a motor therein is driven by a driving motor and forms a composite turntable rotating around the Z axis and the Y axis. The numerical control milling machine can realize five-axle linkage so as to satisfy processing requirements of three-dimensional camber structure and complex tiny parts.

The invention relates to an error compensation method for integral turbine blade machining based on mathematical model reconstruction, belonging to the technical field of error compensation of part machining in mechanical engineering. In the method, the theoretic mathematical model of blades is reconstructed before the blade machining, and the error of the blade machined through the reconstructed mathematical model is largely reduced so as to greatly improve the precision of the blade machining. The error compensation process is completed before the machining and the machining process keeps unchanged and has high feasibility. In addition, multiple blades on an integral turbine are good in machining conformity without needing manual repairing, thus the method has high efficiency.

The invention discloses a milling machine used for processing single-screw compressor rotors, comprising a machine body, a vertical column and a mill support device which are arranged on the machine body, wherein, the vertical column is connected with a workpiece rotary chuck and a device which leads the workpiece rotary chuck to vertically move along the z-direction; the workpiece rotary chuck is connected with a transmission mechanism which leads the workpiece rotary chuck to rotate around the x-axis; the milling machine is characterized in that the mill support device comprises a mill seat and a mill axes arranged on the mill seat and used for mounting the mill, and a base arranged in a horizontal guideway along the y-direction of the machine body; the base is provided with a chassis rotated by the linking to the workpiece chuck; two translation mechanisms which lead the mill seat to horizontally move in the x-direction and the y-direction respectively are arranged between the mill seat and the chassis, and a rotation mechanism which leads the mill support to rotate along the x-y plane; the mill support is provided with a mill driver which leads the mill axes to rotate. The special mill machine of the invention has the advantages of high processing speed and processing precision, and can produce high-precision single-screw compressor engaged channel pairs.

The invention discloses a five-axis linkage horizontal machining center machine tool. A lathe bed comprises a horizontal lathe bed and a longitudinal lathe bed. The machine tool is characterized in that: the horizontal and longitudinal lathe beds are arrange in a T shape; a rotary table moves side to side, namely performs X-axis motion on the horizontal lathe bed; an upright post moves back and forth, namely performs Z-axis motion on the longitudinal lathe bed; a spindle head drives a spindle to move up and down, namely performs Y-axis motion on the upright post; the spindle swings around the axis of the A axis, namely performs A-axis motion; the rotary table rotates around the axis of the Y axis, namely performs B-axis motion; the X axis, Y axis, Z axis, A axis and B axis can realize five-axis linkage machining; the A-axis single spindle head has a wide pendulum angle ranging from -120 to +95 degrees; a double-exchange workbench is matched in front of the horizontal lathe bed; the right of the longitudinal lathe bed is provided with a magazine tool and a tool changing mechanical arm, and also provided with a tool measuring and workpiece measuring device; and the moving upright post has a front-and-side bidirectional variable cross section structure. The five-axis linkage horizontal machining center machine tool is suitable for machining medium and large titanium alloy aviation structures at high efficiency and high precision, and meets the requirements on high-efficiency high-precision machining equipment for the titanium alloy aviation structures of the domestic aerospace industry.

The invention discloses a five-axis ball-end milling geometric error compensation method and belongs to the machine tool error compensation field. The method includes the following steps that: with the structural parameters of a five-axis numerical control machine tool considered, the forward kinematics equation and post-processing program of the five-axis numerical control machine tool are established; a workpiece ideal cutter pose file is obtained according to a workpiece machining code and on the basis of the forward kinematics equation; transformation relationships between ball-end millingcutter poses and cutter contact points representing workpiece texture are established; a five-axis ball-end milling integrated geometric error analytical model is established according to the exponential product theory; cutter contact point safeguard measures are established for five-axis ball-end milling geometric error compensation; a swarm intelligence optimization algorithm is applied to obtain a compensated rotation axis angle; the translational axis motion amount of the compensated rotation axis angle is calculated; and the workpiece ideal cutter pose file is read, and a compensation matching code is calculated. With the method of the invention adopted, workpiece texture quality can be ensured when geometric error is compensated, and therefore, the machining precision of the five-axis machine tool and workpiece surface quality can be further improved.

The invention belongs to the technical field of grinders, and particularly relates to a full-automatic numerical control cylindrical grinder with manipulators capable of feeding and blanking. The full-automatic numerical control cylindrical grinder with the manipulators capable of feeding and blanking comprises an engine base, and a workpiece clamping mechanism and a grinding wheel mechanism are arranged in the engine base; the full-automatic numerical control cylindrical grinder with the manipulators capable of feeding and blanking further comprises an automatic feeding mechanism and an automatic blanking mechanism, the automatic feeding mechanism comprises a first manipulator and a first cylinder, the automatic blanking mechanism comprises a second manipulator and a second cylinder, the engine base is provided with a beam, the first manipulator and the second manipulator are connected with the beam in a sliding mode, the engine base is further provided with a detection mechanism used for detecting the outer diameter of a workpiece, and the detection mechanism is located at the front end of the workpiece clamping mechanism. The full-automatic numerical control cylindrical grinder with the manipulator capable of feeding and blanking is configured with the manipulator capable of feeding and blanking automatically and automatic detection equipment, the unmanned operation of the whole procedures of the workpiece processing technology which comprises blank feeding, clamping, processing, detecting, material taking out and material taking up can be completed, the processing efficiency and the processing precision are high, and the unmanned operation can reduce the labor cost.

The invention relates to a method for processing thin-wall semi-circular parts. The method comprises the following steps: (1) pipe material or bar material is prepared; (2) any end part of the pipe material or bar material is provided with a technical extending section; (3) the end surface of the technical extending section is provided with a datum hole; (4) technical processing is carried out on the pipe material or bar material through the datum hole; (5) the processed pipe material or bar material is segmented; and (6) the technical extending section is removed. The invention provides a method for processing the thin-wall semi-circular parts, which can improve the processing precision, is convenient to operate and can reduce the investment cost of equipment.

A numerical control ceramic pile forming machine is automatic production equipment which integrates a plurality of functions of ceramic forming, basing and engraving. Three linear axles of X, Y and Z and two revolving axles of A (worktable revolving) and B (rolling manipulator and engraving joint swinging shaft) are movably composed. Five axles in all are composed and five-axle linkage is realized. Plugs are extruded out of a vacuum extruder (20). The machine can pile the pugs layer by layer for forming in any shape through a soft pipe (7) by the rolling manipulator (6) on the worktable (4) to replace a manual billet tension process. The pentahedron basing and the engraving process are implemented on the billets after being dried. Therefore, the automatic production of ceramic forming, basing and engraving is realized.

The invention discloses a U-shaped pipe landing leg punching tool, which is characterized in that a U-shaped pipe locating assembly and two side punching assemblies are arranged on the top surface of a horizontal bottom plate, wherein the side walls of a U-shaped pipe locating sleeve in the U-shaped pipe locating assembly are provided with punch via holes, the two side punching assemblies are symmetrical about the U-shaped pipe locating sleeve, a slider in each side punching assembly can slide left and right, the top surface of each slider is fixedly provided with a declivity wedge and a punch stopper, the end face, close to the U-shaped pipe locating sleeve, of each punch stopper is provided with a punch, a punching die is arranged right above the horizontal bottom plate, when the punching die downwards moves, two acclivity wedges push the two declivity wedges in the two side punching assemblies to simultaneously move towards the opposite direction, so that the two sliders can drive the two punches to simultaneously move towards the opposite direction. The U-shaped pipe landing leg punching tool can be used for well locating a U-shaped pipe and further machining holes in landing legs of the U-shaped pipe in a side punching manner, since the U-shaped pipe can be precisely located via the operation, the height error of machined holes in the two landing legs of the U-shaped pipe can be effectively eliminated.

An engraving machine comprises a machine table (10), a bracket (20), a Y-axis travelling mechanism (40), an X-axis travelling mechanism (50), a Z-axis travelling mechanism (60) and a control system (70), wherein an engraving machine spindle (30) is connected on the Z-axis travelling mechanism (60); the Y-axis travelling mechanism (40) is connected with two first gears (42) meshed with a first rack (41) simultaneously; a first driving motor (45) drives the first gears (42) through a synchronous belt (46); an expanding mechanism (47) is arranged between a first synchronous belt pulley (43) and a second synchronous belt pulley (44); and the engraving machine also comprises a pivot angle control mechanism (80) which drives the engraving machine spindle (30) to change angles. By adopting the technical proposal, the engraving machine is characterized by high processing precision, wide adjusting range of engraving angle, higher working efficiency and the rigidity capable of meeting requirements, and can save materials and raise the labor productivity.

The invention discloses a multistage monocrystalline silicon square rod surface grinding device, which comprises an engine base and a horizontal working turnplate arranged on the engine base through a vertical bearing. The working turnplate is connected with a transmission device; equant positions of the upper surface of the working turnplate is provided with a plurality of sets of silicon rod positioning units respectively; the lateral surfaces of the engine base are fixedly connected with the plurality of grinding units having the same structure; each grinding unit comprises an upright post; the upright post is connected with a sliding seat through a precision linear motion component; the precision linear motion component is connected with a precision motor; the sliding seat is also provided with a cooling water pipe and an electric main shaft vertically arranged; and the lower end of the electric main shaft is provided with a grinding wheel. The device can quickly assemble the silicon rod, achieves multistage, circulatory and continuous operations of coarse grinding, fine grinding and polishing of the plurality of rods, and improves machining accuracy and production efficiency.

The invention discloses an annular multi-station synthesis valve body machining device and relates to the technical field of machining an air bottle valve. A plurality of stations are positioned at a plurality of positions around a rotating disk; a chuck is arranged on the rotating disk and is used for clamping a workpiece; one station is used for placing or taking down the workpiece; a power head box base is respectively arranged on the other stations; a power head is arranged on the power head box base for machining the workpiece; and each station is provided with 1 to 3 radial or/and upward or/and downward power heads respectively, which are used for processing 1 to 3 procedures of three operations of turning or/and drilling or/and tapping of an external protrusion or/and an upper protrusion or/and a lower protrusion. The annular multi-station synthesis valve body machining device has the advantages that: labor, power and time are saved, the efficiency is about eight times of that of common lathes; the machining error is low and the precision is about eight times of that of the common lathes; the service life of a tool is over ten times of that of the common lathes; the energy is saved, the unit consumption is about 1/12 of that of the common lathes; and the total cost can be reduced by about 50 percent.

The invention relates to a method for extracting effective ingredients of cortexes of plant seeds, in particular to coix seed bran, which contains coix seed cortexes and/or seed embryos, wherein the obtained coix seed bran extract can be used for preparing coix seed oil and contains over 85 percent of oil in coix seeds; the yield of extracted coix seed bran oil is over 18 percent; and separated coix seeds can be used for processing foods or directly used as refined coix seeds.

The invention discloses a large-diameter-height-ratio ultra-precision hydrostatic pressure rotary table, belongs to the technical field of ultra-precision manufacturing equipment, and meets the requirements of a large-size ultra-precision lathe used for machining high-precision large-aperture non-spherical optical parts. An upper floating throttler and a lower floating throttler are respectively installed on an upper floating thrust plate and a lower floating thrust plate, the upper floating thrust plate is fixedly connected with a base seat of the rotary table, the lower floating thrust plate is fixedly connected with the base seat of the rotary table through an inner isolation ring and is arranged in an annular groove of the upper floating thrust plate, a radial bearing bush is fixedly connected with the base seat of the rotary table through the lower floating thrust plate and the inner isolation ring, a main shaft is fixedly connected with an upper floating plate, and hydraulic oil is throttled through the throttlers and forms an upper floating liquid hydrostatic pressure thrust oil film between the upper floating plate and the upper floating thrust plate, a lower floating liquid hydrostatic pressure thrust oil film between a lower floating plate and the lower floating thrust plate, and a radial hydrostatic pressure support oil film between the radial bearing bush and the main shaft, so that an axial sealed-type liquid hydrostatic pressure plane round ring thrust bearing and a radial liquid hydrostatic pressure cylindrical bearing are formed. The large-diameter-height-ratio ultra-precision hydrostatic pressure rotary table is applied to the large-size ultra-precision lathe used for machining the high-precision large-aperture non-spherical optical parts.

The invention provides a method for preparing high strength and ductility magnesium-rare earth alloy through a selective laser melting additive manufacturing technology. The method comprises the following steps that A, through a gas atomization method, Mg-RE-(Zn)-Zr alloy spherical powder is prepared; B, selective laser melting molding is carried out on the Mg-RE-(Zn)-Zr alloy spherical powder toobtain the high strength and ductility magnesium-rare earth alloy; and C, the magnesium-rare earth alloy made in the B is subjected to heat treatment: solid solution + aging treatment or aging treatment directly. Through regulating of selective laser melting process parameters (laser power, scanning speed, scanning interval, light spot diameter, layer thickness, interlayer corner, base plate preheating temperature, partition width and lap-joint area width and subsequent heat treatment process parameters (temperature and time), the microstructure and the mechanical property of the alloy are regulated. The selective laser melting technology is used firstly for preparing the high strength and ductility Mg-RE-(Zn)-Zr alloy.

The invention relates to a micro-water-column guiding laser micromachining device, which comprises a supporting sleeve, a water tank, a nozzle and an optical focusing lens. The optical focusing lens is mounted in the supporting sleeve horizontally through a lens mount, and the lens mount is connected with a nozzle orifice center regulating mechanism in the Z direction. The water tank is mounted at the lower end opening of the supporting sleeve, and is connected with a high-pressure water system through a water inlet pipe joint. A quartz window is arranged in the middle of the top end of the water tank and faces the center of the lower end opening of the supporting sleeve, the nozzle is arranged in the middle of the bottom end of the water tank, and the focusing point of the optical focusing lens is located at the orifice center of the nozzle. The water tank is also connected with nozzle orifice center regulating mechanisms in the horizontal X direction and the Y direction. The micro-water-column guiding laser micromachining device is provided with the regulating mechanisms for coupling alignment of laser in the horizontal direction and the longitudinal direction, and accordingly three-dimension relative positions of the laser focal spot and the nozzle orifice center can be regulated accurately, and coupling effect of the focusing lens and optical fibers in water stream during water guiding laser micromachining is guaranteed.

The invention discloses an offset detection and control method for a spiral hole milling device and belongs to the technical field of spiral hole milling. The method includes the following steps that a laser detection device is installed to form a detection region; the spiral hole milling device is started, so that a cutting blade of a tool is located in the detection region; autorotation of the tool is performed and the actual diameter d of the tool is detected; according to the actual diameter d of the tool and the nominal diameter D of a hole to be machined, the theoretical offset is determined, and meanwhile the allowed maximum offset error is set according to the tolerance zone of the hole to be machined; the offset value of the spiral hole milling device is adjusted to be the theoretical offset e0; revolution of the tool is performed and the actual offset e is detected; the detected actual offset e is compared with the theoretical offset e0, and spiral hole milling is performed if the actual offset e is qualified; and adjustment is performed if the actual offset e is not qualified till the actual offset e is qualified. By the adoption of the method, influences of tool size errors on the diameter of the machined hole are eliminated, the machining accuracy of the machined hole is improved, the rejection rate is reduced, and economic benefits and production efficiency are improved.

The invention relates to the field of machining, in particular to a novel cam shaft machining process, which comprises the following steps of: preparation of a blank, tempering, sampling, drilling a center hole, first turning, second turning, first milling, burring by bench workers, drilling of an oil hole with diameter of 70, quenching of a cam profile, second milling, accurate grinding of a cam, flaw detection and demagnetization, acid etching detection, first clamping, vibrating for burring, second clamping, three-dimensional detection, detection of a cam outline, third clamping, detectionof finished products, cleaning, installation of a positioning sleeve, oil coating, and storing. The numerical control turning and milling machining and the CBN (Cubic Boron Nitride) high-speed follow-up grinding machining are adopted for machining the cam profile of the process disclosed by the invention.

The invention discloses a quartz vibration beam accelerometer and a manufacture method thereof. The quartz vibration beam accelerometer comprises a quartz vibration beam and a quality-flexible structure, wherein the quality-flexible structure comprises a base and a quality block, the base is connected with the quality block through a flexible hinge, pads are respectively arranged on two ends of the quartz vibration beam, the base and the quality block, assembly between the pads on the corresponding positions is in a bonding mode through metal alloy, and an exciting electrode is connected on a pad corresponding to the base. The manufacture method for the quartz vibration beam accelerometer comprises a photoetching technique, wet etching micro processing technology manufacturing and a reflow soldering technology. The quartz vibration beam accelerometer and the manufacture method thereof have the advantages that the quartz vibration beam accelerometer is high in processing precision, good in corresponding relation of the position and the size of the pads, meanwhile, high in assembly precision, good in repeatability, and simple in assembly technique.

The invention provides an abrasive particle flow ultra-precision machining device. Injection pressure and speed of abrasive particle flows are adjusted by adjusting threads between a pressure head and an abrasive particle flow injection polishing nozzle, and pressure is provided for a sealed box through a pneumatic cylinder, so that pressure is applied to the pressure head through a pressure plug. According to the abrasive particle flow ultra-precision machining device, the pneumatic cylinder for replacing a spring applies pressure to the pressure head so that accuracy of pressure of the abrasive particle flow injection polishing nozzle to a work-piece can be effectively improved, the abrasive particle flow machining accuracy is improved, and ultra-precision machining is achieved; meanwhile, concentration of abrasive particles in the abrasive particle flows is monitored and controlled in real time, so that machining accuracy and efficiency are guaranteed; Injection pressure and speed of the abrasive particle flows are adjusted by adjusting the threads between the pressure head and the abrasive particle flow injection polishing nozzle, and a pressure-maintaining flow stopping part is arranged at the tail end of the abrasive particle flow injection polishing nozzle so that the machining efficiency can be effectively improved. By means of the abrasive particle flow ultra-precision machining device, both machining efficiency and ultra-precision machining accuracy can be guaranteed.

A wire electric discharge machine capable of maintaining machining-fluid temperature in a machining tank uniformly, even when the state of machining changes, for example between rough machining and finish machining. A first temperature sensor for detecting the machining-fluid temperature in a clean-fluid tank is provided to the clean-fluid tank or a machining-fluid cooling device. A second temperature sensor for detecting the machining-fluid temperature in the machining tank is provided. On the basis of machining conditions, etc., a controller of the wire electric discharge machine selects the second temperature sensor in machining producing much heat such as rough machining, and selects the first temperature sensor in machining producing little heat such as finish machining. The machining-fluid cooling device performs cooling control on the machining fluid in the clean-fluid tank based on the temperature detected by the selected temperature sensor.

The invention provides an infrared detection device applying counter-compensation heat dissipation design, ensuring that the whole focal length of an optical system is unchanged or slightly changed when an external temperature changes in a certain range, thereby keeping favorable imaging quality. The infrared detection device also comprises a temperature comprehension tube, an infrared lens is wholly and coaxially arranged in the temperature comprehension tube which is in rigid connection with a lens cone at one end of a thermal imager, and the material expansion coefficient of the temperature comprehension tube ensures that the axial stretching of the temperature comprehension tube and the rear intercept generated by the infrared optical system have the same size and opposite directions when the external temperature changes in a range of 40 DEG C below zero to 60 DEG C. The invention has simple and convenient design, excellent comprehension effect and higher reliability and can be applied to any infrared optical system under adverse mechanical and temperature environments, such as aviation and aerospace, and the like.

The invention relates to an XZC three-axis linkage thread milling method for a milling machining center, which is mainly used for solving the problems of another anchoring, positioning and the like brought by secondary machining in the floor type boring and milling procedure when large diameter thread holes of the reference circle of a large rotational part are machined. The method comprises the following steps of: anchoring the large rotational part after the center of the large rotational part is adjusted to be consistent with the rotational center of a workbench of the milling machining center; installing a thread milling cutter with a power head to make X-axis and Z-axis linear movement by respectively using corresponding points of the surface of a workpiece as starting points according to the position and the size of thread holes on the drawing; driving the workpiece to make C-axis rotational swing angle movement by the workbench, performing interpolated linkage milling through the cooperation of XZC three axes to from spiral linear movement trails, and machining out each large diameter thread hole in the rotational part workpiece. The purpose for completing all machining procedures including large diameter thread hole milling in the reference circle of the large rotational part workpiece on one milling machining center is basically realized. Moreover, the invention has the advantages of high machining accuracy, low manufacturing cost and high production efficiency.

The invention belongs to the technical field of air cylinder sleeves, and particularly relates to an energy-saving light spiral groove cast-in type air cylinder sleeve and a preparation method thereof. The air cylinder sleeve is prepared from, by weight percentage, 2.8%-3.5% of carbon, 1.2%-2.1% of silicon, 0.2%-0.5% of phosphorus, 0.06%-0.12% of sulfur, 0.3%-0.7% of manganese, 0.3%-0.7% of copper, 0.2%-0.5% of chromium, 0.1%-0.4% of molybdenum, 0.1%-0.2% of tin, larger than 0 and smaller than or equal to 0.05% of vanadium and the balance iron. According to the air cylinder sleeve, through smelting, casting and machining, graphite on the wear surface of the material of the air cylinder sleeve is evenly distributed in a flaky shape, fine lamellar pearlite bodies are the main of the base body structure of the friction surface, the hardness ranges from 94 HRB to 104 HRB, and tensile strength is larger than or equal to 360 MPa. After casting, the bonding strength of the air cylinder sleeve and a cylinder body is high and is 40 MPa or more.

The invention relates to an electro-hydraulic servo valve for a prestage independent type jet flow pipe, which mainly solves the technical problems of the improvement of the manufacturability of the electro-hydraulic servo valve, and the like. The electro-hydraulic servo valve adopts the technical scheme that the prestage jet flow pipe is provided with a switching block; the bottom surface of the switching block is connected with a main valve; the top surface of the switching block is connected with a torque motor; a receptor is fixed in an installing hole of the middle part of the switching block; a position adjacent to the bottom surface of the switching block is provided with a left oil hole and a right oil hole; one end of the left oil hole and one end of the right oil hole are connected with a left guide hole and a right hole of the main valve respectively; and the other end of the left oil hole and the other end of the right oil hole are communicated with a left receiving hole and a right receiving hole of the receptor respectively. The electro-hydraulic servo valve for the prestage independent type jet flow pipe is suitable for various electro-hydraulic servo valves for the prestage jet flow pipe.

The invention discloses a shrouded impeller finish machining tool path planning method. The shrouded impeller finish machining tool path planning method comprises the following seven steps of model establishment, tool selection, machining area division, blade profile curved surface reconstruction, tool center point computation, tool shaft vector computation and post-processing. According to the shrouded impeller finish machining tool path planning method, obtained finish machining tool path can be in a streamline direction, so that the product machining efficiency can be improved; by means of small-angle five-axis plunge milling, deformation of tools caused by radial component force can be greatly reduced, and the blade machining precision can be enhanced; tool marks generated by tool feeding at both ends can be reduced.