35results about How to "Guarantee the quality of the machined surface" patented technology

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 belongs to the field of mechanical manufacture cutting cutters, and in particular relates to a SiZrCN gradient composite coating cutter and preparation method thereof. The coating is the SiZrCN gradient composite coating prepared by adopting a composite coating method of unbalanced magnetron sputtering and electric arc plating; the surface of the coating cutter is SiZrCN gradient composite coating with gradually-changed gradient of nitrogen content, a Ti transition layer and a SiZrC transition layer are sequentially arranged between a cutter base body and the coating. By adopting the SiZrCN ultra-hard carbon-nitrogen compound coating, because two metals including Si and Zr are added in the coating at the same time, the nitrogen content of the coating structure component is gradually changed in a gradient manner, so that the cutting machining performance of the cutter can be improved. The coating has high hardness and heat stability, and also has good diffusion prevention and wear prevention performances, good plastic deformation resistance ability and excellent friction and wear resistance property. In the cutting process, the cutter can effectively prevent the occurrence of cracking of cutting edges and hot cracks, guarantee the machining surface quality of the workpieces, and prolong the service life of the cutter by more than 70%.

The invention discloses a coating cutter steady-state temperature field predicting method considering cutter rear surface abrasion. By means of the method, firstly, a thermal model used for describingthe coating cutter temperature change in the cutting and machining process is built, secondly, heat flux entering a cutter from the front cutter surface and heat flux entering the cutter due to abrasion of the rear cutter surface are calculated respectively, through cutting experimental data, heat exchange coefficients are estimated to be used for determining the heat flux distribution proportionfor entering chips and the cutter, and then instantaneous cutter temperature distribution under different cutter states is simulated and predicated. Precise cutter temperature prediction in the abrasion state of a coating cutter is easily achieved, by optimizing technology parameters, the service life of the cutter is prolonged, and the machining surface quality of parts is improved.

A chip breaking drill bit with a step edge type comprises a drill tip, a guide part and a tool handle. The guide part is arranged between the drill tip and the tool handle. The drill tip comprises a chisel edge and two main cutting edges. The chisel edge is located between the two main cutting edges. Each main cutting edge comprises a front tool face and a rear tool face. Each main cutting edge is in a step edge type and comprises a first step edge body and a second step edge body, both of which are composed of a step transverse edge body and a step vertical edge body. According to the drill bit, step structure design is conducted on the main cutting edges, so that the load on unit cutting edge is reduced, the contact area of the rear tool faces of a tool and the machined surface of a workpiece is reduced, and the cutting force is reduced; meanwhile, through the step edge type, the deformation degree of cutting chips can be effectively increased, the cutting chips can be easily broken, smoothly discharged and prevented from twining around the tool, the quality of the machined surface of the workpiece and the service life of the tool are guaranteed, the durability of the tool is improved, and the machining quality and the machining efficiency are guaranteed.

The invention provides an ultrasonic auxiliary cutting force control method. The ultrasonic auxiliary cutting force control method comprises the steps of building an ultrasonic auxiliary system, adjusting and controlling ultrasonic vibration parameters and adjusting and controlling cutting force. The step of building the ultrasonic auxiliary system comprises: building a two-dimensional ellipticalultrasonic auxiliary turning system; the step of adjusting and controlling the ultrasonic vibration parameters comprises: carrying out ultrasonic end face turning with different ultrasonic vibration parameters and fixed cutting parameters under the set power supply frequency of the ultrasonic vibration auxiliary system, and obtaining an optimal material removal parameter by measuring the cutting force, observing a material removal mode and the extension/brittleness region cutting parameter range; and the step of adjusting and controlling the cutting force comprises: fixing the ultrasonic vibration parameters, adopting the different cutting parameters, and obtaining the maximum cutting force under the optimal cutting parameters through numerical comparison of the cutting force and the machined workpiece surface roughness.

The invention discloses a five-axis machine tool speed planning method based on S-shaped acceleration and deceleration. The method comprises the steps: obtaining the path information of a continuous machining path, and building a complete S-shaped acceleration and deceleration model; dividing an incomplete acceleration and deceleration process into a plurality of conditions, and establishing a corresponding acceleration and deceleration speed diagram planning method; then correcting the limiting speed of the starting point of the small line segment; determining acceleration and deceleration types which should be adopted by the current small line segments through the S-shaped acceleration and deceleration classification model, calculating displacement, speed and acceleration diagrams of the small line segments, and solving coordinate values of each axis under a workpiece coordinate system through linear interpolation; and finally, converting the coordinate value of each axis in each interpolation period in a workpiece coordinate system into the coordinate value of each axis in each interpolation period in a machine tool coordinate system by adopting reverse coordinate transformation, performing part processing, calculating the velocity diagram of each small line segment forwards segment by segment, and finally obtaining the interpolation instruction position and instruction speed on the whole processing path. High feeding speed can be achieved, and moving stability of moving parts of a machine tool is guaranteed.

The invention discloses an ultrasonic cutting and polishing machining system. The ultrasonic cutting and polishing machining system comprises an ultrasonic transducer, an amplitude transformer, and awiper blade cutter, wherein the front end of the ultrasonic transducer is tightly and reliably connected with the rear end of the amplitude transformer; the ultrasonic transducer is connected with anultrasonic power supply through a lead; a flange plate is arranged at the vibration displacement node position of the amplitude transformer; the flange plate is connected with a B-axis rotary tool rest through a supporting plate; and the wiper blade cutter is tightly and reliably connected with the front end of the amplitude transformer. According to the ultrasonic cutting and polishing machiningsystem, ultrasonic high-frequency vibration in the feeding direction of the cutter can improve the action length of a wiper blade, reduce the generation of secondary tool marks on the machining surface of the wiper blade, and improve the quality of the machined surface; due to the cleaning effect of the ultrasonic vibration, it is difficult to generate chip accumulation at the wiper edge, and thequality of the machined surface is better guaranteed; the ultrasonic vibration changes the contact state and action mechanism between the cutting edge and the wiper edge and the material to be machined, reduces the cutting force and the cutting temperature, and improves the surface quality after the cutting edge is processed, and thus the quality of the machined surface is further improved due tothe combined action of the polishing edge and the ultrasonic vibration.

The invention provides a customizing method of a drum-taper-shaped ball-end milling cutter, and belongs to the technical field of numerical control milling machining. The customizing method comprisesthe steps that relevant geometrical relationships of the drum-taper-shaped ball-end milling cutter are designed, and cutting parameters of the machining efficiency are taken into consideration, so that relevant geometrical drawings are obtained; then mathematical models are established according to the limitation and restriction relationship of the relevant geometrical relationships; when parameterized customization is conducted, known parameters are brought in the relevant mathematical models, and the barrel-shaped side blade radius range and the cutter bar neck diameter range are calculated;parameters within the barrel-shaped side blade radius range and the cutter bar neck diameter range are manually given, and integers are selected as the parameters; and the rest of parameter values are obtained, and a three-dimensional model of the drum-taper-shaped ball-end milling cutter is established in three-dimensional software UG. The customizing method of the drum-taper-shaped ball-end milling cutter has the advantages that the machining efficiency is improved threefold or severalfold on the basis that the quality of the machined surface is guaranteed, the phenomenon that due to cutterreplacement, cutter connecting marks and cutter replacement errors exist is avoided, systematized and parameterized customization conducted by engineering personnel is facilitated, and the customizing method is quite simple and convenient to use.

The invention belongs to the field of grinding and polishing machining of a composite material component by a robot, and particularly discloses an elastic deformation and vibration inhibition method for grinding and polishing machining of the airplane composite material component by the robot. The method comprises the following steps that a first independent variable group and a first dependent variable group are designed; a multi-parameter combined grinding machining orthogonal test is carried out on the first independent variable group and the first dependent variable group to obtain a nonlinear relationship between the grinding force and the material removal amount; a force-position hybrid control strategy of global variable pressure and local constant pressure is adopted to control elastic deformation in the grinding machining process by the robot; and an optimal rigidity and posture relation in the machining space of the robot is constructed, a machining track of the robot is optimized according to optimal combination and grinding and polishing machining process parameters after elastic deformation control to determine grinding and polishing machining process parameters of a machining area. According to the elastic deformation and vibration inhibition method for grinding and polishing machining of the airplane composite material component by the robot, effective control ofthe elastic deformation and vibration suppression in the grinding and polishing machining process of the airplane composite material component by the robot can be achieved, grinding and polishing machining vibration lines are eliminated, and the machined surface quality is guaranteed.

The invention relates to a complicated curved face milling, grinding and measuring integrated machining machine tool and a forming method and belongs to the technical field of mechanical manufacturing. A gantry is fixedly connected to a base, and an X-direction slide table is fixedly connected to the base; a Y-direction guide rail is fixedly connected to a slide table of an X-direction guide rail;a rotating workbench is fixedly connected to a slide table of the Y-direction guide rail; the upper portion of the rotating workbench is used for being fixedly connected with a clamp and a workpiece;two Z-direction slide tables are arranged, and fixedly connected to the left and right sides of the middle of the gantry correspondingly; an ultrasonic machining system is fixedly connected to a sliding table body of the Z-direction slide table on the left side; and a grinding and polishing assembly is fixedly connected to a slide table body of the Z-direction slide table on the right side. The complicated curved face milling, grinding and measuring integrated machining machine tool and the forming method have the beneficial effects that correcting is achieved many times in the machining process, and the machining precision is improved; machining manners are diverse and comprises milling polishing, grinding polishing and milling and grinding polishing, operation from starting to ending iscompleted in one time of clamping, the clamping frequency is reduced, and the machining precision and the machining efficiency are improved.

The invention discloses a rotary machining cutter which comprises a rotary cutter body, wherein cutter slots are formed in the outer edge at the front end of the rotary cutter body; cutter holders are mounted in the cutter slots through cutter holder fastening components; cutting blades are mounted at the head parts of the cutter holders through cutting blade fasteners; adjusting structures are also mounted in the cutter slots; the adjusting structures are located between the tail part surfaces of the cutter holders and the tail part positioning surfaces of the cutter slots; all the surfaces, located between the tail part surfaces and the end surfaces of the cutter holders, of the cutter holders are circumferential surfaces of the cutter holders; each cutter holder fastening component comprises at least two cutter holder fasteners; and the cutter holders are locked by the cutter holder fasteners in different directions of the circumferential surfaces of the cutter holders. The rotary machining cutter provided by the invention has the advantages of positioning stability, strong vibration resistance, long service life, high machining precision and the like.

The invention provides a conductive slip ring dissimilar material pressure poured piece numerical control turning method. The method comprises the steps that first, a benchmark slot is machined in a part fixture and a numerical control lathe chuck through an annular slot turning tool; second, a camera-shooting measuring system is used to perform shooting on four quadrants of a part; third, in thecamera-shooting measuring system, an image, obtained in the second step, of the four quadrants of the part is processed; fourth, a mid-value of a positive extreme value and a negative extreme value isused as a measuring center line of a first metal ring sheet; fifth, a benchmark slot center line on the first metal ring sheet is read, and the distance between the benchmark slot center line and a measuring center line is calculated; sixth, as to other metal ring sheets of the part, the fourth step is repeated to acquire the measuring center line of each metal ring sheet, and then the fifth stepis repeated to calculate the distance between the benchmark slot center line and the measuring center line of each metal ring sheet; and seventh, a numerical control turning program is made accordingto obtained Z-axis coordinates of a numerical control system during turning of a double-V-shaped slot of each metal ring sheet, and a forming turning tool of the double-V-shaped slots is adopted to perform turning.

The invention discloses a PCBN blade with a combined cuttings-guiding structure. On the basis of an original blade, two rotatable cuttings-guiding sheet bodies are additionally arranged on a cutter body and are the upper cuttings-guiding sheet body and the lower cuttings-guiding sheet correspondingly, and the two cuttings-guiding sheet bodies are each provided with two types of cuttings-guiding cutter-edge shapes such as the circular arc shape, the broken line shape, the triangle and the linear circular arc shape; compressing washers are arranged at the centers of upper parts of the two cuttings-guiding sheet bodies, and fixing chunk devices are mounted on the two sides of a rotating center. According to the PCBN blade with the combined cuttings-guiding structure, in order to meet the cuttings-guiding needs of hard cutting machining, lower the production cost of cutters and realize quick replacing, the same blade can be used in various machining conditions, and the using efficiency isimproved; and the PCBN blade provides a new cutter design thought for coordinating cutting flow and improving the surface machining quality.