253results about How to "Improve machined surface quality" patented technology

A cutting insert for a milling machining adapted to be mounted on a milling cutter to carry out cutting operation and having primary and secondary cutting edges provided at sides of a rectangular body, each primary cutting edge having a curved line tangential to the adjacent secondary cutting edge, to reduce the cutting force and improve flatness of the side surface of a machined workpiece. The cutting insert includes an upper face, a bottom face and a plurality of side faces connecting the upper face and the bottom face. The primary cutting edge has chip breakers for guiding chip flow, primary cutting edge land faces and primary cutting edge clearance faces. The primary cutting edges enable a bottom surface and a side surface of a machined workpiece to have a right angle therebetween.

The invention discloses a rotary ultrasonic machining device based on non-contact energy transfer. The rotary ultrasonic machining device based on non-contact energy transfer comprises a high-speed electric spindle, a primary side assembly fixed to the lower end of the high-speed electric spindle, an ultrasonic knife handle assembly composed of an ultrasonic knife handle and a secondary side assembly arranged on the periphery of the ultrasonic knife handle, and an ultrasonic power supply generator. The ultrasonic knife handle assembly is arranged at the lower end of the high-speed electric spindle, so that the secondary side assembly corresponds to the primary side assembly up and down. The ultrasonic power supply generator is connected with the primary side assembly. According to the rotary ultrasonic machining device based on non-contact energy transfer, the ultrasonic machining technology can be directly combined with existing computer numerical control (CNC) machining centers such as CNC engraving and milling machines, engraving and milling machines, high-gloss CNC machines and drilling and tapping centers, and original spindles do not need to be modified; non-contact energy transfer of ultrasonic waves is achieved through the primary side assembly and the secondary side assembly, and the rotation speed reaches 10,000 turns/min; in addition, the automatic knife switching function can be achieved by using an exiting magazine.

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 a high frequency ultrasound elliptic vibration cutting device which comprises an ultrasound vibration unit and a casing unit. The ultrasound vibration unit is arranged in the casing unit. The casing unit comprises a base, A cover plate, B cover plate and an upper cover plate. The ultrasound vibration unit comprises an amplitude transformer, a vibrating body, A excitation source, B excitation source and C excitation source. The amplitude transformer is installed on the vibrating body. The end part of the amplitude transformer is provided with a cutting tool. The A excitation source and the B excitation source are arranged in parallel way and are adhered on the lateral side of the vibrating body. The C excitation source is installed on the lower part of the vibrating body. The A excitation source and the B excitation source form the driving power in horizontal direction. The C excitation source forms the driving power in vertical direction. The phase separation between two mutually vertical high frequency vibrations is applied for compounding an elliptic vibration at the point of the cutting tool. Thus, the processing surface roughness is lowered effectively. The cutting device works at the high vibration frequency of 100 kHz-200 kHz, so that the vibration chipping critical speed of the cutting tool is improved, and the processing efficiency is improved obviously. The amplitude transformer is adopted to be inserted in the vibration body, so that the installation is easy, and the practicality of the ultrasound elliptic vibration cutting can be promoted.

The invention discloses a diamond grinding wheel of an elliptical working face and a mutual wear forming and trimming method thereof. The profile of an axial section of a working face of the diamond grinding wheel is an elliptical arc profile; an end face of the diamond grinding wheel is an elliptical face; in the method, a diamond grinding wheel tool travels from left to right to a top point of an elliptical arc at a first starting point outside one side of a silicon carbide grinding stone along an elliptical arc traveling path, is then lifted along a first circular arc tangential to the top point and with a radius of more than 2mm, next travels from right to left to the top point of the elliptical arc from a second starting point outside the other side of the grinding stone along the elliptical arc traveling path and is lifted along a second circular arc tangential to the top point and with a radius of more than 2 mm. Compared with the conventional circular face diamond grinding wheel, the elliptical face diamond grinding wheel has the advantages that: a flatter grinding wheel elliptical working face and a workpiece curved surface can be used for complexing to grind, the number of effective grinding particles is increased, and the surface quality and the shape accuracy of curved surface grinding are improved.

The invention discloses a diamond coating cutter, and a preparation method and the application thereof in high speed graphite processing. The diamond coating cutter comprises a cutter tip, a blade and a clamping cutter holder, wherein the clamping cutter holder is made of a hard alloy matrix, the cutter tip and the blade are coated with diamond coatings on matrix materials, the diamond coating cutter is characterized in that the end cutting edge front angle gamma o1 of the blade is 2 to 6 degrees, the end cutting edge rear angle alpha 1 is 5 to 13 degrees, the peripheral cutting edge front angle gamma o2 is 5 to 15 degrees, the peripheral cutting edge rear angle alpha 2 is 10 to 14 degrees, and the helical angle beta is 15 to 45 degrees. The diamond coating cutter provided by the invention has the characteristics of high hardness, wear resistance, low friction coefficient, good heat conduction and the like, is suitable for high speed graphite processing, can effectively overcome frictional wear caused by graphite dust to the surface of the cutter, and is classified as an ideal cutter for cutting graphite.

The invention relates to a method for forming cutter machining tracks on an NURBS combined curved surface and belongs to the technical field of numerical control machining. According to the method, by splicing vector fields, the problem that the smooth and topologically controllable cutter machining tracks are formed on a C1 continuous NURBS combined curved surface is solved. The method comprises the following steps: carrying out sampling on each surface piece of the combined curved surface along the feeding direction, respectively, so as to obtain the feeding direction of each surface piece in a corresponding parameter domain; establishing a localized feeding vector field based on a stream function represented by a sample-B primary function polynomial on each surface piece parameter domain, and regulating the control parameters close to the borders of adjacent vector fields, so as to realize the G1 splicing of the vector fields; and selecting required series flow lines from the G1 continuous combined vector field according to the machining precision requirement, and mapping the series flow lines to the combined curved surface, so as to obtain the feeding tracks required by the machining. According to the method, the uniform expression meeting machining track line groups of the C1 continuous combined curved surface is achieved, and smooth and various-form machining tracks can be formed.

The invention discloses an electric spark induction controllable erosion and mechanical finishing compound cutting dual-servo feeding processing system which is characterized by comprising an electric spark induction erosion electrode servo feeding control system (1) using an erosion state as a sampling basis and a mechanical finishing tool automatic feeding regulating system (2) using a cutting force as a sampling basis, wherein the electric spark induction erosion electrode servo feeding control system controls the feeding of an induction erosion electrode, ensures that the electric spark induction erosion in a machining region is controllably, efficiently and stably carried out, and forms an erosion product and a softened layer through controllable erosion; and the mechanical finishing tool automatic feeding regulating system ensures that the erosion product and the softened layer which are generated by erosion are cut and removed without cutting a base body material, so that the tool loss is reduced, the finished surface quality is ensured and the processing efficiency is increased. According to the invention, the processing efficiency of a metal material difficult in processing can be remarkably increased, the finished surface quality is increased, and the finished surface is final mechanized surface due to the mechanical finishing function of a tool.

The invention relates to a pulse laser processing-based novel positive rake diamond abrasive tool manufacturing method, being characterized in that a diamond grinding wheel with orderly-arranged abrasive particles is eroded by pulse laser, so that a vertex angle of the diamond abrasive particles is changed from being greater than 90 degrees to being smaller than 90 degrees, thus a traditional negative rake grinding method of a diamond abrasive tool is changed, and the abrasive particles taking part in the grinding are changed into a positive rake machining mode during grinding. Compared with traditional grinding (namely negative rake grinding), when the positive rake diamond grinding wheel is used for grinding, three processes of scratching, plowing and cutting are not needed, cutting is directly performed, and the traditional grinding machining mode is changed. When the diamond grinding wheel performs positive rake grinding on a hard and brittle material, normal grinding force is less than tangential grinding force, and the normal grinding force and the tangential grinding force during positive rake grinding are both less than those during negative rake grinding, so that surface/subsurface damages, such as microcracks, residual stress, phase change, dislocation and ripple, of the hard and brittle material subjected to grinding are effectively reduced, and the surface completeness of the material can be greatly improved.

The invention discloses a CVD diamond grinding wheel with an ordered micro-structured surface and a making method thereof. The grinding wheel is characterized in that a layer of diamond film is deposited on the outer circumferential face of a grinding wheel hub, a large number of staggered in-order micro grinding units are machined on the whole outer circumferential face of the diamond film, and the top ends of the grinding units are in kidney shapes. The making method is characterized in that through the chemical vapor deposition that is CVD, the diamond film is deposited on the outer circumference face of the grinding wheel hub, a pulse laser beam is adopted to machine the large number of micro grooves with the same geometric dimensioning in the outer circumference face of the whole diamond film, and the large number of micro grinding units are formed; the grinding units are arranged in a staggered and in-order manner, the top face of each grinding unit is in a kidney shape, according to the grinding wheel, the effective sharpening number of the grinding wheel during grinding can be improved, the chip formation efficiency and the surface material removal rate are improved, the cutting performance is improved, the surface machining quality and the cutting efficiency can be improved, the holding force of the grinding wheel hub to the grinding units can be increased, and the service life of the grinding wheel can be obviously prolonged.

The invention discloses an ultrasonic vibration lens micro-rotation assisted laser machining device. The ultrasonic vibration lens micro-rotation assisted laser machining device comprises a laser generator and an ultrasonic generator, the output end of the laser generator is connected with one end of a collimating lens of a laser working head through an optical fiber terminal, the laser working head comprises the collimating lens, an ultrasonic transducer, an amplitude-change rod, a focusing lens micro-rotation mechanism and a fixing frame, the laser working head is fixed to a machine tool spindle through the collimating lens, a clamp and internal hexagonal bolts, the fixing frame comprises a fixing frame bottom plate, the focusing lens micro-rotation mechanism is arranged in the middle ofthe upper surface of the fixing frame bottom plate, the top of the focusing lens micro-rotation mechanism and one end of the amplitude-change rod are in threaded connection, the other end of the amplitude-change rod and a lower cover plate of the ultrasonic transducer are in threaded connection, and the fixing frame bottom plate and an upper cover plate of the ultrasonic transducer are fixedly mounted through four connecting columns. By controlling the ultrasonic vibration amplitude and a rotating shaft sleeve, the size of a trapezoidal column focus formed by a laser focusing lens is finely adjusted, and the laser machining device can finely adjust the shape dimension of the focus.

A punching compound ide comprises an upper die portion and a lower die portion. The upper die portion comprises a die shank, an upper die seat, an upper die baseplate, two upper top blocks, a rubber cushion block, an upper press block and two guide sleeves. The die shank is positioned above the upper die seat, and the upper die baseplate is positioned below the upper die seat. The upper top blocks are positioned below the upper die baseplate, and are mounted on the left portion and the right portion of the upper die baseplate through hexagon socket head bolts and dowels respectively. The rubber cushion block is positioned below the middle of the upper die baseplate. The upper press block is positioned below the middle of the rubber cushion block, and penetrates into the upper die baseplate from the upper die seat in a threaded mode to be connected with the rubber cushion block and the upper press block. The guide sleeves are positioned at two positions in front of the lower side of the upper die seat, and are mounted below the upper die seat in a close-fitting mode. By the punching compound die, shearing of workpieces with different materials, arcs and bore diameters can be realized.

The invention discloses a special numerical control machine tool for machining a small part. The special numerical control machine tool comprises a machine tool body, a control mechanism and a three-axis machining mechanism; the Y-axis machining mechanism comprises a liftable large slide carriage; an X-axis machining mechanism comprises an X-axis ball screw; an X-axis stepping motor is used for driving the X-axis ball screw so that a small slide carriage can be driven to move horizontally by an X-axis nut; two groups of worktables and a row tool type tool magazine are detachably installed on the small slide carriage; two Z-axis machining mechanisms are arranged; each Z-axis machining mechanism comprises a Z-axis ball screw; and each Z-axis stepping motor is used for driving the corresponding Z-axis ball screw so that an electric spindle can be driven to move horizontally by a Z-axis nut. The special numerical control machine tool disclosed by the invention improves the part machining efficiency, increases the percent of pass of products, guarantees the machining quality and the stability of the machining quality, can be provided with different cutting tools according to the machining content of different types of work pieces so as to implement various machining of milling, drilling, chamfering, deburring and the like, realizes procedure centralization and machining automation of the small part, and alleviates the labor intensity of a worker.

The invention discloses a finish-milling feeding speed optimizing method based on integral impeller blade shape. The method comprises the steps of generating a finish-machining cutter track source file of a spherical head cutter blade with the radius as RT and based on a spherical head according to a geometrical shape of an integral impeller blade, introducing a single impeller blade model, judging the cross line between a runner and the blade according to the distance between a point on the blade and the center of an impeller, extracting the cross line, discreting the cross line into W points according to equal chord heights, composing a point set U through W points, setting the longitudinal depth acceleration proportion omega between the top end of the blade and the tail end of the blade, sequentially reading and analyzing the cutter track source file generated in the step 1 line by line, and extracting cutter point information of all cutting paths in the cutter track source file generated in the step 1. In addition, the cutter track source file records cutter point coordinates under a processing coordinate system and cutter axis vectors corresponding to the cutter point coordinates. The finish-milling feeding speed optimizing method solves the technical problems that an existing method is low in processing efficiency, poor in processing quality and serious in cutter abrasion.

The invention discloses an ultrasonic-vibration surface-enhanced and finishing processing device with electric-contact heating assistance. The ultrasonic-vibration surface-enhanced and finishing processing device comprises an electric brush, a main shaft, a guide line, an arc-extinguishing device, a power supply, an ultrasonic-vibration generation device, a workpiece and a chuck, wherein a knife head of the ultrasonic generation device, the power supply, the arc-extinguishing device, the electric brush sheathed on the main shaft, the main shaft, the chuck and the workpiece are connected in sequence and in series to form a conducting loop; current generated in the conducting loop is utilized to enable a material of the contact part between the surface of the workpiece and the knife head to generate joule heat for instantaneous warming and softening, and by combination of ultrasonic vibration, finishing processing, surface enhancement, fine-grain enhancement and residual stress elimination are realized. The invention also discloses an ultrasonic-vibration surface-enhanced and finishing processing method with the electric-contact heating assistance utilizing the device. The ultrasonic-vibration surface-enhanced and finishing processing device and method disclosed by the invention have the advantages that the structure is simple, the precise finishing processing and surface enhancement of various conducting materials can be realized, the quality of the processed surface can be improved, the surface roughness is reduced, the surface residual stress can be eliminated, and the ultrasonic vibration also can play a role in enhancing fine grains of the material of the surface of the workpiece.

A floating disc suspension polishing device comprises a polishing base disc and a floating disc, wherein wedge grooves and processing stations for placing workpieces to be processed are formed and arranged on the surface, opposite to the floating disc, of the polishing base disc in the circumferential direction; the wedge grooves are filled with polishing solutions; the wedge grooves and the processing stations are arranged at intervals; the polishing device further comprises a spring, a force sensor, a lifting platform and a master driver; the polishing base disc and the master driver are connected and can rotate around a spindle; the polishing base disc is positioned on the floating disc; the floating disc is connected with the upper end of the spring; the lower end of the spring is connected with the force sensor; and the force sensor is fixedly connected with the lifting platform. The floating disc suspension polishing device presses precisely, grinds stably, and is small in surface damage and high in quality.

The invention provides a modularization type material addition and reduction composite repairing method for a defective region of a component surface and relates to the technical field of machining. The main process of the method comprises the following steps of: implementing three-dimensional scanning on the defective region of the component surface and acquiring point cloud data of a to-be-repaired region; calculating the characteristic parameters of the defective region according to the point cloud data; selecting a corresponding geometric module according to the characteristic parameters;implementing modular milling and removal on the defective region to obtain a regular to-be-repaired region; implementing modular laser melt-coating repairing on the to-be-repaired region; and precisely milling the laser-repaired surface to end the repairing. By adopting a material addition and reduction composite way, the method provided by the invention repairs a complicated irregular defective appearance into a regular geometry; on the basis, the modular to-be-repaired geometry is subjected to laser melt-coating repairing; and the operation route is conveniently and quickly planned, so the overall repairing efficiency is improved. Beside, the precise milling for the laser melt-coating region can maintain the repairing precision of the contour of the repaired surface, and the use performance of the repaired surface is also improved.

The invention discloses a chip absorbing and cooling connecting piece used for a boring end effector, which is installed on the front plate of the supporting unit of the boring end effector. The chip absorbing and cooling connecting piece comprises a pressure head pipe casing, an A nozzle, a B nozzle and a pressure foot, wherein, the structure of the A nozzle is identical with that of the B nozzle; the A nozzle and the B nozzle are respectively installed in an A threaded hole and a B threaded hole at the upper part at the front end of the pressure head pipe casing, and the rear end of the pressure head pipe casing is installed in the counter sink of the pressure foot. The chip absorbing and cooling connecting piece is provided with two nozzles, can realize the switch between the cooling modes and cooling mediums in one drilling process, such as the gas cooling mode can be switched to the liquid cooling mode, or a cutting fluid can be switched to another cutting fluid, and switching is useful particularly when laminating materials consisting of different materials are processed.

The invention discloses an ultrasonic processing device, in particular to a high-speed rotary ultrasonic torsional processing device which comprises an output shaft and a transmission shaft. A rare-earth rod and tubular piezoelectric ceramic are mounted in an inner bore of the output shaft from inside to outside along an axial direction sequentially. An induction coil is wound on the output shaft, a coil former and an outer sleeve are arranged on the outer side of the transmission shaft, a closed coil storage chamber is formed by the coil former and the outer sleeve, and an excitation coil is disposed in the coil storage chamber. The ultrasonic torsional processing device which is manufactured on the basis of rare earth magnetostriction materials and piezoelectric ceramic materials is connected with a spindle of a machine, is subjected to two-dimensional ultrasonic mechanical vibration while driving a tool head to rotate at high speed, and thus, ultrasonic torsional processing of workpieces is achieved. Besides, the device realizes high-speed rotary ultrasonic torsional processing, ultrasonic frequency band is wide, ultrasonic energy is high, running state is stable, ultrasonic vibration amplitude can be regulated by changing magnetic field intensity and prepressure, and accordingly requirements of different processing precisions can be met.