1237 results about "Cutting force" patented technology

An electromagnetically induced cutting mechanism provides accurate cutting operations on soft tissues. The electromagnetically induced cutter is adapted to interact with atomized fluid particles. A tissue remover comprises an aspiration cannula housing a fluid and energy guide for conducting electromagnetically induced cutting forces to the site within a patient's body for aspiration of soft tissue. The cannula is provided with a cannula distal end. The proximal end of the cannula is provided with fluid flow connection to an aspiration source. Separated soft tissue and fluid are aspirated through the cannula distal end and the cannula by an aspiration source at the proximal end of the cannula.

Catheters, kits, and methods are provided for removing material from a body lumen. The catheters and methods may be used in a variety of body lumens, including but not limited to coronary and other arteries. In general, the catheter has a cutting element that cuts material while the material is engaged by a material capture device on the catheter body. Preferably, the material capture device tensions the material during cutting, which reduces the amount of cutting force required. The material capture device typically follows a path that draws material into the catheter body. Preferably, but not necessarily, the material capture device may be arranged on the catheter body to advance along a path outwardly from the catheter body into the material and then inwardly towards the catheter body to tension the material. The cutting element on the catheter body moves between a first position and a second position to cut the material while in tension.

The present invention is related to a shaving implement that includes at least a razor cartridge and a mechanism. The razor cartridge includes at least one blade that has a sharpened cutting edge and defines a blade plane. The mechanism is disposed in the shaving plane and moves the blade in the blade plane during shaving. The mechanism may be either a vibration mechanism (i.e., a motorized spinning eccentric weight), or a dithering mechanism (i.e., a piezoelectric element). The cut force required to shave, when the blades are moving in the blade plane, is significantly reduced.

The invention discloses a method for optimally designing dynamic property of a complete machine tool, which comprises the following steps of: establishing a complete machine tool entity parameterized model, simplifying the structure according to the analysis requirement on the dynamics and the structure characteristic of the machine tool; and guiding the simplified entity model into a finite element analyzing software ANSYS/Workbench for grid division to obtain a complete machine finite element model. The statics analysis is carried out through the ANSYS/Workbench to obtain a complete machine prestress field, and the mode of the complete machine tool under the prestress field is obtained through the mode analysis. The complete machine tool dynamics response of a main shaft, caused by a cutting force, under different rotating speeds is obtained through resonance response analysis on the complete machine tool, and the reference is provided for the searching of the dynamics thin link and the optimization design. Finally, by using the parameterized analysis method, the rule of influencing the complete machine tool dynamic property by the structure quality and the rigidity parameter is obtained, and the dynamic rigidity thin link is obtained and optimally designed.

A method and apparatus for a robotic machining process that gives a controlled removal rate of material from a workpiece when an object, tool or workpiece, held by a robot is brought into contact with a stationary object, workpiece or tool. A signal indicative of the force applied by the held object t the stationary object is used to control the rate at which the robot moves the held object in relation to the stationary object. Associated with the robot is a controller that has tunable proportional and integral gains. The controller determines a command for the feed rate of the tool when the tool engages the workpiece. In response to that command, the proportional and integral gains are tuned to obtain a cutting force to be applied to the workpiece when the tool engages the workpiece that is substantially the same as a desired cutting force.

A shear/seal ram provides a knife edge at the shearing edge and the knife edge is inclined to minimize the cutting force required and to leave a clean cut edge. The knife edge is presented in an opening of the ram, thus the opening is positioned at the axis of the BOP, and consequently the coiled tubing, before the coiled tubing is run through the BOP. A biasing means, such as for example a Bellville spring, forces a sealing sleeve against the underside of the ram to prevent leakage of pressure from below the BOP. Similarly, a plurality of biasing means, referred to herein as “skates”, forces the ram down against the sealing sleeve to seal pressure from above the BOP.

The invention discloses an industrial robot cutting processing system and a method applied to aircraft auxiliary assembly, comprising a six-axis joint typed industrial robot, a robot controller, an operation panel, a high speed electric mainshaft, a tool clamping process device, a tool quick exchanger, a target installation flange and a laser tracker; high speed cutting technique is adopted; process methods and hole preparing process of boring, reaming by milling and final reaming are sequentially carried out so as to improve the diameter precision of the hole; meanwhile, the cutting force can be controlled by finishing the reaming hole; rough milling is carried out firstly, fine milling is subsequently carried out; furthermore, the cutting depth is not more than 0.15mm during the fine milling process, thus ensuring the planeness of the processing surface; the industrial robot cutting processing system can realize various cutting processes of the soft metal (such as aluminium alloy) as follows: boring, hole enlarging, reaming, dimpling, surface milling, cutting, etc. The invention integrates normal robot, high speed electric mainshaft, quick exchanger, etc., and can solve the cutting process problems of operations such as fine processing, skin cutting, and the like of radar cover installation hole in the field of aircraft assembly.

The invention discloses a five-axis side milling machining process parameter design method, belongs to the technology of numerical control (NC) machining, and solves the problem that real machining conditions cannot be reflected in cutting force calculation in the conventional process parameter design method. The method comprises the following steps of: tool path planning, cutting force calculation and process parameter optimization; in the tool path planning step, an NC code is generated by using computer-aided manufacturing (CAM) software; in the cutting force calculation step, first, a continuous tool path is generated from the NC code; then, a cutting thickness is obtained; and finally, the cutting force is calculated according to the cutting thickness; and in the process parameter optimization step, whether the calculated cutting force is not greater than a design threshold is judged; if the calculated cutting force is not greater than the design threshold, the NC code, the cutting depth and a feed rate are taken as input parameters; and otherwise, an NC code is regenerated. In the method, the real machining conditions are reflected by utilizing a tool enveloping surface analytical expression and the obtained transient cutting thickness is more accurate, so that the accuracy of the calculation of the cutting thickness and the cutting force is improved, and reliable assurance is provided for precisely and efficiently machining a spatial curved surface.

The invention discloses a five-axis side milling cutting force predicting method based on an ACIS platform, and is used for solving the problem that the real machining condition cannot be reflected in conventional cutting force calculation. The method comprises the following steps of: fitting the edge of a cutter with unequal space width through a B spline, simulating by a finite element method to acquire a cutting force, calibrating dynamic eccentric parameters of the cutter by using the cutting force data, correcting cutter position data by using the eccentric parameters of the cutter to acquire actual cutter reference points, extracting an instantaneous cutter-workpiece engagement region by using the actual cutter reference points and using ACIS as a platform, calculating the actual movement locus and the instantaneous cutting thickness of the edge by using the actual cutter reference points, and calculating the instantaneous cutting force by using the calculated cutting thickness and the calibrated cutting force coefficients. According to the method, the instantaneous cutting thickness is calculated by using the actual movement locus of the edge, so that the real machining condition is reflected, and the predicting accuracy of the cutting force is improved.

The invention relates to a test device of a machine tool spindle, in particular to a machine tool spindle reliability test bed based on mixed loading of electro-hydraulic servo and a dynamometer, and aims to solve the problem that the conventional machine tool spindle reliability test device cannot truly simulate dynamic cutting force loading, static cutting force loading and cutting torque loading. The machine tool spindle reliability test bed mainly comprises a machine tool spindle supporting part, a torque loading part and a cutting force loading part, wherein the machine tool spindle supporting part is formed by combining a spindle box base plate (14) and an iron gasket (15); the torque loading part consists of a loading rod (12), an elastic diaphragm coupler (9) and the dynamometer (8), which are coaxially assembled; and the cutting force loading part employs two loading modes, namely a cutting resultant force loading mode and a cutting axial force and radial force separated loading mode. By performing reliability test for simulating true working conditions on the tested machine tool spindle, the failure of a product is stimulated and exposed, and practical basic data are provided for reliability growth and evaluation of the product.

A tube cutter for cutting a circular tube having a central tube axis, the cutter comprising: a housing with first and second parallel rollers defining a cradle for receiving a tube cut with the tube axis generally parallel to the axes of the rollers, a cutter head reciprocally mounted on the housing for sliding linearly in a direction toward and away from the rollers, the cutter head having a base and an upstanding arm supporting a cutter wheel rotatable about an axis generally parallel to the axes of the rollers and facing the tube in the cradle, a spring element biasing the cutter wheel in the stated direction and toward the rollers, and a threaded shaft between the housing and cutter head, and rotatable to move the cutter head linearly toward the housing, whereby the cutter wheel engages the tube and the spring element creates a cutting force pushing the cutter wheel against the tube for cutting the tube.

The invention provides a method for predicting the axial direction cutting force of supersonic vibration auxiliary grinding for fragile materials. The method includes the steps that the kinematics characteristics and the indentation characteristics of a single abrasive grain are analyzed under the supersonic vibration auxiliary action, the effective cutting time of the single abrasive grain, the relation of the average cutting force and the maximum impact force of the single abrasive grain, the material removal size and the number of effective abrasive grains participating in machining within a vibration period are determined, the relation of axial direction cutting force and cutter parameters, workpiece material performance parameters, cutting parameters and vibration parameters is established ultimately, the number of the effective abrasive grains participating in machining and the plastic deformation removal of materials are comprehensively considered, a octahedron material removal size calculation method is put forward, a predicator formula of the axial direction cutting force Fa is established, the formula is more close to the real machining condition, and therefore the precision for predicting the axial direction cutting force of supersonic vibration auxiliary grinding for fragile materials is improved.

The invention relates to a cutter abrasion online monitoring method based on wavelet packet analysis and a radial basis function (RBF) neural network. The method comprises the steps that shear force coefficients and cutting edge force coefficients of tangential force and radial force in different cutter abrasion states are calibrated by means of an instantaneous cutting force coefficient recognition method; and by analyzing the correlation between cutting force coefficients and cutter abrasion, the coefficients are taken as cutter abrasion characteristic parameters and input into a RBF neutralnetwork model after being subjected to normalization processing. An input layer of a RBF neutral network monitoring model training process comprises cutting force characteristics, cutting vibration characteristics, the shear force coefficients and the cutting edge force coefficients after being subjected to normalization processing; and an output layer comprises the cutter rear cutter surface abrasion capacity after being subjected to normalization processing; a hidden layer comprises neurons obtained through radial basis function iterative optimization; and it is verified that the RBF neuralnetwork monitoring model has the advantages of high response speed and high recognition precision through cutter abrasion monitoring experiments.

The invention relates to a 5-axis NC flank milling machining feed rate off-line planning method, which carries out 5-axis NC flank milling machining feed rate off-line planning on the basis of various axis cubic spline polynomial interpolation. By establishing an optimizing model which takes time sequences between adjacent position points of various axes as design variables, takes the minimum sum of running time sequences between adjacent position points of various axes as an objective function, takes limits of speeds, accelerations and jerks of various axes of a machine tool as restriction, and simultaneously takes the maximum cutting force in the cutting process of a tool is smaller than a threshold value as restriction, the method adopts global optimization algorithm to solve and obtain the optimal feed rate. The method is suitable for free-form surface rough machining and ruled surface or similar ruled surface semifinishing.

The fixed cutter drill bit disclosed utilizes a unique piloting section and reaming section carefully designed to impart several specific operational advantages. In the piloting section, cutting structures have been arranged so as to create offsetting cutting forces that result in a net zero imbalance during operation. Furthermore, the piloting section utilizes carefully placed shock studs which aid in protecting the primary cutting structure. In addition, the location of the fluid supply nozzles on the body of the reamer section serves to indicate the occurrence of a catastrophic cutting structure failure below the pilot gage.

The invention provides a method for optimizing uncertain curve-surface five-axis numerical control process parameter of the cutter modal parameters, belonging to the technical field of computer numerical control machining. The method for optimizing the machining process parameter comprises the steps as follows: firstly, the uncertain area of the cutter system modal parameter is obtained; a five-axis milling machining dynamic model is established; the input parameter of the model comprises a cutter system modal parameter area, a cutting force coefficient, a cutter geometry and a cutter path; the five-axis milling machining vibration stabilization curve is calculated; and by taking the five-axis milling machining vibration stabilization curve as a constraint, the process parameter optimization model is established and worked out by a sequence nonlinear planning method so as to obtain the optimized process parameter. As the invention considers the uncertainty of the cutter system modal parameter and is closer to the real machining condition, thus improving the exactness of the vibration prediction during the machining.

The invention relates to a reliability loading testing device and a reliability loading testing method for a main shaft of a numerically controlled lathe. The testing device comprises a testing platform body and a control system, wherein the testing platform body is provided with a motor, a radial cutting force simulated loading device, an axial cutting force simulated loading device, a bearing loading unit and a torque loading system. The main shaft to be detected is fixedly arranged on the testing platform body through a main shaft box . The motor drives the main shaft to be detected by a belt; the radial cutting force simulated loading device, the axial cutting force simulated loading device and the torque loading system are used for applying a torque, a radial force and an axial force to the main shaft to be detected through the bearing loading unit. The invention creates a condition for simulating the main shaft under a cutting state of the lathe; a reliability loading test and a precision recession test on the main shaft of the numerically controlled lathe can be realized; an early-stage fault of the main shaft is exposed and a precision recession rule of the main shaft is grasped.

The invention provides an experimental device for cutting off a carbon fiber composite material, and belongs to the field of research on hardly machined material cutting devices. The experimental device is provided with experiment functional devices by taking a cutting device as a basic structure, wherein the experiment functional devices comprise a work piece quick assembling-clamping and temperature control device, a high-speed micro-examination device, a temperature and cutting force online measuring device and a dust remover. In the high-speed micro-examination device, a lens is connected with a high-speed camera, the high-speed camera is arranged on a single-axis precision displacement platform pedestal which is arranged on a camera support, a light source is aligned to a cutting area and the high-speed camera is connected with a computer system. The experimental device for cutting off the carbon fiber composite material, which is disclosed by the invention, can effectively realize the observation on a cutting process, precisely measures the temperature and the cutting force in real time, controls the temperatures of a sample and a cutter, and studies on material breakage forms, material removal mechanisms and cutter abrasion mechanisms under different cutting conditions, so as to provide experimental support for the explanation of the carbon fiber composite material cutting basic theory.

The invention relates to a piezoelectric-type four-dimensional cutting force-measuring platform belonging to the technical field of sensing measurement and control, in particular to a force-measuring platform for detecting normal force and torque in three directions in the cutting process. The force-measuring platform comprises a base, a middle plate, an upper plate, a lead output plug, a lead, a thermal baffle, a sealing ring, four piezoelectric quartz sensors, a protective pad and connecting screws, wherein the four piezoelectric quartz sensors in diamond arrangement between the base and the middle plate are uniformly distributed on the same circumference of the same horizontal plane. The piezoelectric-type four-dimensional cutting force-measuring platform can simultaneously measures the normal force and the torque in three directions in any cutting process, has the advantages of high sensitivity, good linearity and repeatability, little transversal interference and high measurement precision and has universality for measuring drilling, grinding, milling, lathing and planing, thereby having wide application range.

The invention belongs to the field of machinery cutting cutter manufacturing, and relates to a preparation method for a laser cladding soft and hard composite coating self-lubricating cutter. A rake face coating of the cutter is a multi-layer structure. Firstly, a hard coating of nano Al2O3 ceramic or an ultrafine cemented carbide, etc. is clad on the rake face of the cutter by utilization of a CO2 laser synchronous feeding manner, and then a self-lubricating soft coating is clad by utilization of nickel-covered MoS2 powder or nickel-covered WS2 powder. The cutter has characteristics of good toughness, high hardness, a self-lubrication function, and the like. During a drying cutting process, the hard coating bears loads and the rake face self-lubricating soft coating has low shearing strength, thus reducing friction between the cutter and chips, reducing the cutting temperature and the cutting force, and therefore cutter abrasion is reduced. The cutter can be widely used for dry cutting and cutting machining of difficult-to-machine materials.

The invention provides a method for assessing a technology for a large numerical control machine, comprising the following steps: obtaining frequency response function curve of the large numerical control machine through structure composition dynamic stiffness experiments; employing nonlinear least square method to identify dynamical parameter through curve least square fitting; establishing a non-linear dynamical model of machining process of the numerical control machine by identifying machining technical parameters of cutting force dynamic model in a cutting force experiment; then employing the method of random sampling to simulate tooling motion trail and calculating the number of failpoints to work out probability of technological reliability.With the method of the invention, technological reliability of the numerical control machine can be accurately assessed according to the existing structural characteristics, processing technic characteristics and processing conditions of the large numerical control machine, so that accuracy and high efficiency of technological reliability assessment can be improved and a new method is provided for on-line reliability assessment of the large numerical control machine.

The invention provides a Ce-contained rare-earth polishing powder and a preparation method thereof. The Ce/Ce (mol ratio) of the rare-earth polishing powder is 0.5 percent to 20 percent. Low-valency Ce contained in cerium oxide crystal lattice promotes conversion between Ce and Ce, and strengthens the formation of a hydroxide hydrate softening layer between the polishing powder and glass in the polishing process as well as the polishing performance of the powder. The rare-earth polishing powder contains the Ce, thus having good suspension properties, high dispersivity, large cutting force when being applied to glass polishing, few scratches on the glass polishing surface, and high polishing planeness. The Ce-contained rare-earth polishing powder has simple as well as easily controlled preparation process and is easy for industrialized production.

The present invention relates to a multi-target cutting data generation algorithm and cutting parameter optimization method of a numerical control machine tool. The core algorithms of a database comprise calculation of cutting processing states such as cutting force and dynamic cutting vibration, and calculation of load conditions such as cutting power and main shaft torque, processing quality such as processing precision and surface roughness, processing efficiency information such as processing time and material removal rate and benefit assessment such as cutter wearing and production cost.Cutting parameters are optimized according to a calculation result to improve the usage rate and part processing efficiency of a machine tool. A cutting database algorithm developed aiming at a numerical control lathe and numerical control turning center is integrated on a domestic I5 intelligent numerical control system platform to allow machine tool users to conveniently call and select cuttingparameters according to concrete processing demands and to predetermine cutting effects, which are likely to generate, before actual cutting.

The TBM rock breaking test apparatus provided by the invention comprises a wheel box (6), a rock box (16), a cutterhead (4) and a worktable (8). The wheel box is provided with a motor (10), a torque speed sensor (7) and a decelerator (12); two ends of the torque speed sensor are connected with the motor and the decelerator respectively; the decelerator is connected with the cutterhead arranged onthe wheel box; a cutter (3) is arranged on the cutterhead; and the wheel box and the rock box are slidingly connected with the worktable. A rear distance rod (1) is connected to an external side of the rock box; a front distance rod (9) is connected to an external side of the wheel box; thrust mechanisms are symmetrically arranged on the worktable on two sides of the rock box and the wheel box; rear ends of the thrust mechanisms are connected with the rear distance rod, and front ends of the thrust mechanisms are connected with the front distance rod; the wheel box and the rock box are pushedto simultaneously carry out compressing or loosening movement on the worktable to realize tool feed and retracting. The apparatus can simulate real working process of the cutter to measure a plurality of key parameters of the cutter, such as cutting force, axial thrust, penetration and cutter space.

The invention relates to a geometry and mechanics integrated optimization information processing method of an interference-free tool path on a complex curved surface. The method comprises the following steps: 1) carrying out discrete process on a ball-end milling cutter to generate a depth element model, wherein the model comprises a discrete cuboid element set including the depth information; 2) carrying out sampling process on a two-dimensional image of a tool and a machine tool environment, judging the interference situation between the tool and the machine tool environment by using the depth information, correcting the position of the tool if the interference exists, judging whether the tool and a workpiece is crossed, if yes, executing a step 3), and if not, continually executing the step 2); 3) analyzing a touch region of the tool and the workpiece by using the depth element model, and calculating an instant cutting force of the ball-end milling cutter; and 4) based on multi-constrained cutting conditions, optimizing the process feeding speed of the complex curved surface by adopting a sequential quadratic programming method. Compared with the prior art, the method provided by the invention has the advantages of being high in computational efficiency, simple in programming and applicable to multi-shaft numerical control processing tool path verification and parameter optimization and the like.

The invention relates to a method of toolpath generation and cutting parameters optimization for high speed milling of a convex pocket, wherein said method comprises a first sub-method of generating a toolpath and a second sub-method of generating optimized chatfree cutting parameters using a genetic algorithm wherein the first sub-method generates milling toolpaths that minimize the radial depth of cut variations as well as the curvature change variations while avoiding leftover material at the corners, wherein said toolpaths automatically avoid self-intersecting features encountered during the offsetting of pocket boundary such that the said toolpaths result in reduction in milling time for a given maximum acceptable radial depth of cut and wherein said second sub-method allows the free choice of cutting parameters and optimizes the milling time and wherein the optimization method incorporates relevant milling constraints as milling stability constraint, cutting forces, machine-tool and cutting tool capabilities.

The invention discloses a construction method of an aluminium alloy material end milling-cutting force and cutting processing deformation model. According to the construction method, a milling-cutting force prediction model on the basis of an average cutting force is established; a milling-cutting force prediction model on the basis of an inclined cutting mechanism is established; on the basis of the established milling-cutting force prediction model on the basis of the average cutting force and the established milling-cutting force prediction model on the basis of the inclined cutting mechanism, single-tooth and multi-tooth transient milling-cutting force predictions are respectively carried out and obtained data is compared with testing data; an aluminum alloy material milling-cutting processing deformation model is established; on the basis of a real number encoded adaptive genetic algorithm, a flatness error of an end milled surface is predicted; the construction method has the important research significance for researching the processing deformation mechanism.

The invention belongs to the field of mechanical cutting tool manufacturing, and relates to a preparing method for a WS2/Zr soft coating micro-nano composite texture ceramic cutting tool. Base materials of the cutting tool are ceramic. The method comprises the steps that firstly, the laser machining technology is adopted to machine micrometer textures of different morphologies and sizes on the front tool face of the ceramic cutting tool, then the laser machining technology is adopted to machine nanometer textures on a negative chamfer and the front tool face, and finally the medium frequency magnetron sputtering deposition plus multi-arc ion plating method is adopted to deposit a WS2/Zr soft coating on the surface of the cutting tool, wherein the WS2/Zr soft coating is arranged on the surface of the cutting tool, and a Zr transition layer is arranged between the soft coating and a base body. According to the ceramic cutting tool, friction between tool chips can be effectively reduced during cutting, the cutting force and the cutting temperature are reduced, and the abrasion resistance capacity of the cutting tool is improved, so that the service life of the cutting tool is prolonged. The ceramic cutting tool can be widely applied to dry cutting and cutting machining of difficult-to-machine materials.

The invention discloses a two-dimensional ultrasound vibration platform and relates to the technical field of non-traditional machining. The two-dimensional ultrasound vibration platform aims at solving the problems that cutting force is large and a tool is worn badly when a common micro milling machine is used for machining hard and brittle materials. The two-dimensional ultrasound vibration platform comprises a bearing plate, an upper vibrating plate, a lower vibrating plate, linear moving guide rails, bow spring pieces, fine adjusting devices, an ultrasonic power supply, ultrasonic amplitude transformers and ultrasonic transducers. The bottom of the bearing plate is directly fixed to a platform of a machine tool through bolts. The lower vibrating plate is mounted on the bearing plate. The middle of one side of the upper vibrating plate and the middle of one side of the lower vibrating plate are each connected with a vibrator. The bow spring pieces are arranged in the middles of the other sides of the vibrating plates. The two ends of each bow spring piece are fixed to the output end of the corresponding fine adjusting device. The amplitude transformers and the transducers are connected through threads to form the vibrators. According to the two-dimensional ultrasound vibration platform, the vibrators produce ultrasonic vibration to drive the upper vibrating plate and the lower vibrating plate to vibrate, different motion tracks can be coupled out according to different demands, and the two-dimensional ultrasound vibration platform is high in transportability and suitable for being popularized in vibration milling or other vibration screening fields.

The invention belongs to the technical field of manufacture of mechanical cutting tools, and in particular relates to a micro-nano composite texture self-lubricating ceramic tool and a manufacture method thereof. According to the micro-nano composite texture self-lubricating ceramic tool, a micron level texture is processed on a front cutter surface by adopting a laser processing technology, a nano level texture is processed on a negative chamfered edge, a solid lubricating agent is filled in the micron level texture and the nano level texture respectively, during chip dry cutting, the dual functions of the micro-nano composite texture and the solid lubricating agent can realize that the friction is reduced and the cutting force and the cutting temperature are reduced, and thus the purposes of preventing adhesion, reducing friction and abrasion and prolonging the service life of the tool can be achieved. The micro-nano composite texture self-lubricating ceramic tool can be widely applied to high-speed dry cutting and cutting of difficult-to-machine materials, can overcome the environment pollution caused by cutting solution, realizes clean production, and is reduced in cost.