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1237 results about "Cutting force" patented technology

Cutting force is a fundamental physics concept that describes the amount of force used in a specific amount of area. This "force per area" relationship is used to derive the amount of stress applied to an object that is being cut. When the stress overcomes the strength of the material it is being applied to,...

Industrial robot cutting and processing system applied to auxiliary assembly of airplane as well as method

InactiveCN101372079ARealize cutting functionMeet the machining accuracy requirementsMeasurement/indication equipmentsLarge fixed membersEngineeringLaser tracker
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.
Owner:ZHEJIANG UNIV +1

Five-axis side milling machining process parameter design method

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.
Owner:HUAZHONG UNIV OF SCI & TECH

Method for predicting axial direction cutting force of supersonic vibration auxiliary grinding for fragile materials

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.
Owner:NANJING UNIV OF SCI & TECH

Cutter abrasion online monitoring method based on wavelet packet analysis and radial basis function (RBF) neural network

ActiveCN108356606AAchieve the effect of online monitoringIncrease costMeasurement/indication equipmentsHidden layerTangential force
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.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Experimental device for cutting off carbon fiber composite material

InactiveCN103837422ASave spaceThe cutting experiment is orderly and accurateInvestigating machinabilityTemperature controlMaterial removal
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.
Owner:DALIAN UNIV OF TECH

Method for assessing reliability of technology for large numerical control machine

InactiveCN101804580ABuild a Frequency Response FunctionImproving the efficiency of process reliability assessmentAutomatic control devicesFeeding apparatusNumerical controlDynamic stiffness
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.
Owner:HUAZHONG UNIV OF SCI & TECH

TBM rock breaking test apparatus

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.
Owner:CHINA RAILWAY TUNNEL GROUP CO LTD

Geometry and mechanics integrated optimization information processing method of interference-free tool path on complex curved surface

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.
Owner:SHANGHAI UNIV OF ENG SCI

WS2/Zr soft coating micro-nano composite texture ceramic cutting tool and preparing method thereof

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.
Owner:SHANDONG UNIV

Two-dimensional ultrasound vibration platform

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.
Owner:TIANJIN UNIV
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