130 results about "Tool vibration" patented technology

An MWD method and apparatus for determining parameters of interest in a formation has a sensor assembly mounted on a slidable sleeve slidably coupled to a longitudinal member, such as a section of drill pipe. When the sensor assembly is held in a non-rotating position, for instance for obtaining the measurements, the longitudinal member is free to rotate and continue drilling the borehole, wherein downhole measurements can be obtained with substantially no sensor movement or vibration. This is particularly useful in making NMR measurements due to their susceptibility to errors due caused by tool vibration. In addition, the substantially non-rotating arrangement of sensors makes it possible to efficiently carry out VSPs, reverse VSPs and looking ahead of the drill bit. A clamping device is used, for instance, to hold the sensor assembly is held in the non-rotating position. The sensor assembly of the present invention can include any of a variety of sensors and / or transmitters for determining a plurality of parameters of interest including, for example, nuclear magnetic resonance measurements.

Methods of and apparatuses for mitigating chatter vibrations in machine tools or components thereof. Chatter therein is suppressed by periodically or continuously varying the stiffness of the cutting tool (or some component of the cutting tool), and hence the resonant frequency of the cutting tool (or some component thereof). The varying of resonant frequency of the cutting tool can be accomplished by modulating the stiffness of the cutting tool, the cutting tool holder, or any other component of the support for the cutting tool. By periodically altering the impedance of the cutting tool assembly, chatter is mitigated. In one embodiment, a cyclic electric (or magnetic) field is applied to the spindle quill which contains an electro-rheological (or magneto-rheological) fluid. The variable yield stress in the fluid affects the coupling of the spindle to the machine tool structure, changing the natural frequency of oscillation. Altering the modal characteristics in this fashion disrupts the modulation of current tool vibrations with previous tool vibrations recorded on the workpiece surface.

The invention relates to a high-precision cylinder sleeve inner wall enclosed special-shaped curve groove processing method, wherein the method is especially suitable for high-precision milling and grinding processing of a cylinder sleeve inner wall enclosed special-shaped curve groove with a large breadth-depth ratio. A mathematical model establishment method for cylinder sleeve inner wall enclosed special-shaped curve groove numerical-controlled programming is brought forward; a self-adaption screening method is used for determining a feed step length calculation method; a method of VC++ program code generation is utilized; and a numerical control system is used for carrying out parameter configuration and a program instruction programming method is used. Therefore, problems processing tool deformation during numerical-controlled milling and grinding wheel wearing and correction during tool vibration control and grinding can be solved; and precise processing of the cylinder sleeve inner wall enclosed special-shaped curve groove with large and variable bound feet is realized. The practical processing result demonstrates that the processing precision and efficiency of the cylinder sleeve inner wall enclosed special-shaped curve groove are improved based on the method.

Vibration or the impact of a tool main body may be blocked by the support of a battery holder via elastic materials in a floating state at the rear end portion side in a feed direction of a driven-members-housing magazine and by the attachment of a battery pack to this battery holder.

The invention relates to an intelligent tool fault diagnosis method. The intelligent tool fault diagnosis method comprises the steps that a PLC is arranged between the CNC end of a machine tool and the machine tool end; a plurality of tool vibration signals x(t) produced in the machine tool machining process are obtained by the PLC, all the collected tool vibration signals x(t) are processed, and tool characteristics are extracted; the correspondence relation between the tool vibration signals and a tool abrasion fault is built according to the obtained tool characteristic information so that the tool abrasion fault can be intelligently identified; each tool vibration signal is trained to obtain a hidden Markov model lambda; and the likelihood ratios are calculated through the trained hidden Markov models lambda, the sequences O of the tool vibration signals are input into all the trained hidden Markov models, the likelihood ratio of each tool vibration signal under the corresponding hidden Markov model is obtained, and then the tool state is identified. According to the intelligent tool fault diagnosis method, the characteristics of the machine tool and the characteristics of the vibration signals in the tool machining process are combined, the tool abrasion fault is automatically detected, and the tool abrasion state can be automatically identified.

An apparatus and method for controlling a work tool on a work machine are provided. The work machine may have first and second actuators, each actuator being operable in a vibratory mode and a non-vibratory mode, and each actuator being coupled to the work tool for changing the position of the work tool. The method may include simultaneously (i) operating the first actuator in a vibratory mode, (ii) operating the second actuator in a vibratory mode, and (iii) receiving a command to change the position of the work tool. The method may further include operating the first actuator in a non-vibratory mode to change the position of the work tool while operating the second actuator in a vibratory mode to vibrate the work tool, in response to receiving the command.

The invention discloses a detection system for tool chattering in milling and a detection method thereof, characterized by comprising following steps: 1), selecting a suitable displacement sampling window; 2), determining a center of a tool and vibration changes corresponding to the center of the tool by using a radius constrained least square method; 3), subjecting a tool vibration signal to empirical mode decomposition, and obtaining a time-frequency spectrum using HHT (Hilbert Huang transform); 4), verifying whether the time-frequency spectrum meets chattering rule. The invention has the advantages that the use of a non-contact detection method, using a laser displacement sensor, overcomes limitations such as size of a workpiece under processing, mass, a mounting mode, and high precision is provided; by studying the influence of milling chattering and tool eccentricity upon positional changes of the center of the tool, positional flutter of the center of circle of the tool is determined, and thus chattering change conditions of the tool are directly reflected; by using Hilbert Huang transform, the limitations of Fourier transform can be overcome and a time-frequency spectrum of signals can be better described.

The invention discloses a simulation method of modeling and forming a surface topography for a side-milling ruled surface. The simulation method comprises the steps that firstly, a principal axis coordinate system is established accurately using a cutter position file according to the side milling mode of a five-axis machine tool, a kinematic description of a tool cutting edge is carried out considering the situation of tool vibration and cutter jumping in actual machining, and a series of discrete blade spacial point cloud data is obtained; then grid division is conducted according to a mathematical equation of the ruled surface and a required simulation area, and a random inclusion box of each grid node is built; the point cloud data in each containment box is analyzed, the lowest representation point affecting the surface topography is extracted, all grid nodes are traversed, and finally a three-dimensional surface topography of the ruled surface is obtained. According to the simulation method of modeling and forming the surface topography for the side-milling ruled surface, the problem of characterizing surface topography of the side milling machining can be solved, and important technical support is provided for virtual manufacturing of the actual machining.

The invention discloses a dynamic milling force measuring method based on tool vibration displacement, and the method improves bandwidth of a measuring system, realizes precise measurement of dynamic milling force, can carry out dynamic compensation on the measuring system, improves bandwidth of the measuring system and realizes precise measurement of dynamic milling force. In order to overcome the limitation, in dimensions of processed workpieces, quality of processed workpieces, measured bandwidth, a mounting way and the like, of an existing dynamic milling force measuring method, the invention discloses a method for indirectly determining dynamic milling force through vibration displacement by utilizing measuring radial vibration displacement of a cutter bar of a rotary milling cutter during milling processing of a laser vibration measurer according to a relationship of vibration displacement and milling force of the milling cutter, solves the measuring distortion problem of milling force at a high milling speed of the milting cutter, carries dynamic compensation for the measuring system, improves bandwidth of the measuring system, and realizes precise measurement of dynamic milling force.

The invention discloses a micro-hole drilling method based on combination of cutting fluid ultrasonic cavitation and tool vibration, the chip breaking and chip discharging capacity can be improved according to the characteristics of micro-hole drilling process; the drilling force and the torque are lowered; the surface quality and the dimension and shape precision of the hole are improved; by adopting the micro-hole drilling method, precise drilling of a micro-hole can be realized; the method mainly comprises the steps that a drilling tool is arranged on a drilling main shaft; axial ultrasonic vibration is applied to the drilling tool by utilizing the vibration function of the drilling main shaft; a to-be-processed part is placed in a box containing water-based cutting fluid, so that the cutting fluid inundates the to-be-processed part; one end of the vibration rod of an ultrasonic vibration device is arranged near the to-be-processed part in the cutting fluid; and axial ultrasonic vibration is applied to the vibration rod through an ultrasonic generator, so that the ultrasonic cavitation effect of the cutting fluid is activated. The precise drilling of the micro deep hole is realized through the ultrasonic vibration effect of the drilling tool and the ultrasonic cavitation effect of the cutting fluid.

Systems and methods for damping torsional oscillations of downhole systems are described. The systems include a damping system configured on the downhole system. The damping system includes a first element and a second element in frictional contact with the first element. The second element moves relative to the first element with a velocity that is a sum of a periodic velocity fluctuation having an amplitude and a mean velocity, wherein the mean velocity is lower than the amplitude of the periodic velocity fluctuation.

Then invention relates to a kind of shock absorption technique that can absorb shocking effectively and steadily. It includes mainly a handle that consists of a main unit, hold part, and spring unit. The main handle is fixed to the electric tool. The hold part connects to the main handle, so it can move along the same direction as the electric tool vibration direction. The spring unit is between the main handle and the hold part. When the hold part moves, the spring unit imposes slanting power on it. Using this invention, no matter how much the force that the person holding is, the spring unit can absorb shocking.

The invention provides a clamp for a milling joint face of a gearbox shell and a use method of the clamp. The clamp comprises a bottom plate. Countersinks corresponding to assembling holes in the shell in position are formed in the bottom plate. A pressing device is arranged on each countersink. Fixed pressing force can be set on each pressing device. A stop dog device clamped to the turning faceof the shell and a support device with the height adjusting and height self-locking functions are arranged on the bottom plate. The use method of the clamp comprises the steps that (1), a workpiece isclamped; (2), the workpiece is tensioned by oil cylinders; and (3), the workpiece is abutted by the support device and locked. The clamp and the use method have the beneficial effects that the degreeof automation is high, the clamping pressure is fixed, the problems of tool vibration, extremely-poor flatness and the like existing in the clamping and machining processes of the thin wall shell aresolved, and the machining accuracy of the milling joint face of the gear shell is guaranteed.

The invention relates to a machining tool and a machining method for a deep taper hole of a liquid rocket engine cavitation pipe. The machining tool comprises a conical head and a reamer handle part,the conical head is of a 6-degree + / -5'conical structure, the molded surface is an arc tooth back, four cutting edges are evenly distributed on the molded surface, and each cutting edge has a 2-degreeedge inclination angle. The machining method of the deep taper hole comprises the steps that a reamer is adopted on a general lathe, the reaming procedure is divided into rough reaming, semi-finish reaming and finish reaming, the machining process is conducted in a pecking mode, and soybean oil is brushed for cooling. The reaming technology is adopted for machining the deep taper hole, compared with a traditional boring technology, the taper hole is good in roundness, tool vibration is little, the machining quality and consistency are good, each cutting edge of the conical finish reamer is ground into a special front-back angle and a special edge inclination angle, batch machining of deep taper holes in an expansion section of one liquid rocket engine cavitation pipe is achieved in cooperation with the machining method, abrasion of the reamer for machining the cavitation pipe taper hole is effectively reduced, the roughness of the inner surface of the hole is reduced, the machining efficiency of the cavitation pipe is improved, and the effect is remarkable in batch production.

The invention discloses a processing method of aluminum alloy booster explosive cartridge class parts. The booster explosive cartridge case class parts are divided into three technology parts of a blanking cap, a cartridge case, and a flange. The blanking cap and the cartridge case are machined and welded into a cartridge case component, then a processing scheme of threaded connection, gumming, solidification and anti-rotation is implemented on the cartridge case component and the flange, through the machining method of alternating a vehicle peripheral circle, bore inner holes, the middle section of self-made annular work tool clamping parts peripheral circle, the tool vibration problem caused when a thin wall deep hole structure is poor in rigidity in the process of processing inner holes of bores is avoided, the roughness of the inner holes is improved, the molding demands of aluminum alloy materials, large flanges, thin wall blind holes and high draw ratio booster explosive cartridge class parts are met, and the problems that the roughness of the inner holes is low, the assembly security of the booster explosive explosives is not guaranteed, and the material utilization rate is low are solved.

A device for transferring torque to a drill bit in a borehole having a borehole axis includes a support element configured to rotate in the borehole about the borehole axis, a torque transferring element configured to transfer torque from the support element to the drill bit and further configured to isolate torsional oscillations that are created at the drill bit from the support element, a blocking element configured to block rotation of the torque transferring element relative to the support element about the borehole axis in at least one direction, and a bearing element between the support element and the drill bit.

The invention discloses an anti-deformation machining method for a thin-wall disc-shaped part. A clamp is installed on a faceplate, the clamp is aligned, and a through hole is formed in the clamp; a to-be-machined part is clamped on the clamp, and the to-be-machined part is aligned; low-melting-point metal is poured into the position of an inner cavity between the clamp and the part through the through hole of the clamp, and it is ensured that the inner cavity is filled with the low-melting-point metal; and after the low-melting-point metal is cooled to the room temperature, the to-be-machined part is machined according to a conventional method, and the workpiece is taken down after machining is completed. Due to application of the low-melting-point technology and design of the metal clamp, the problems that the deformation of the thin-wall part is large in the machining process, tool vibration is likely to happen, and the size is hard to ensure are solved finally.

The invention provides a hole bottom vibration simulation test bed which comprises an upper shock excitation source, a lower shock excitation source, a supporting rack and a measure and control unit. The upper shock excitation source is arranged on the supporting rack, the lower shock excitation source is arranged below the supporting rack, a simulation drilling tool is arranged in the supporting rack, the upper end of the drilling tool is connected with the upper shock excitation source, the lower end of the drilling tool makes contact with the lower shock excitation source, and the measure and control unit is arranged on the drilling tool. According to the hole bottom vibration simulation test bed, upper drilling tool vibration is mainly simulated through an upper electromagnetism vibration exciter, the vibration generated by the action of a drill bit and the stratum is simulated through a curved face plate structure of a lower variable frequency motor, damp restraint simulating devices for different hole walls and bottom drilling tool restraint simulating devices are arranged, and a testing system capable of detecting multiple kinds of performance parameters in real time is allocated. The hole bottom vibration simulation test bed can enable experimental studies to be carried out on the vibration characteristics of the bottom drilling tool, the vibration attenuation characteristics of an under-hole damper, the propagation characteristics of vibration waves in a drilling rod in a laboratory state.

Processes for high speed machining of workpiece materials using high performance tools with prolonged tool life and improved surface finish are provided by vibrating the tool and / or the workpiece at a frequency greater than the frequency of shear localization in the primary shear zone or chip segmentation occurring in the absence of tool vibration, with an amplitude sufficient to break up the tool-chip atomic contact, thereby decreasing the tool-chip contact length through decreasing the tool-chip contact time, thereby suppressing accelerated chemical tool wear caused by dissolution of the tool into the workpiece by nanocrystalline grain boundary diffusion and grain boundary sliding mechanisms by preventing shear localization associated with nanocrystalline grain formation in the primary shear zone of the chip, and suppressing oxidation wear of the tool by preventing segmentation of the chip.

The invention discloses a downhole bearing vibration experiment device, which comprises a vibration table, a rotary output table, a drill rod, a bearing support cylinder, a support sliding table, a support sliding table clamp and a vibration table clamp, and is characterized in that the vibration table clamp is arranged on the surface of the vibration table, and the support sliding table clamp is arranged on the surface of the support sliding table; one end of the drill rod is fixed on the surface of the vibration table through the vibration table clamp, and the other end penetrates through the support sliding table clamp and is connected with the bearing support cylinder. The downhole bearing vibration experiment device can realize simulation for a downhole rotary vibration operation environment, wherein the simulation comprises simulation for an upper excitation source of a power motor, simulation for relative movements of inner and outer rings of a bearing group and simulation for a downhole working plane. The downhole bearing vibration experiment device has the functions of providing rotation, simulating downhole frictional cutting and transferring the vibration, can provide simulated conditions for vibration testing of downhole tools, is used for testing vibration characteristics of downhole bearings and provides a reference basis for an optimization design of the bearing group and bottom hole assemblies.

The invention discloses a vibration control method for tool sharpening of grating ruling. By means of the vibration control method, a cascade control method is adopted for vibration control over the tool sharpening process of grating ruling; a PID (Proportion Integration Differentiation) control algorithm is adopted for an inner ring to control a stepping motor to move a balance weight to move left or right; and grinding loads, exerted on a grinding disc, of a tool are controlled. An automatic search optimization algorithm is adopted for an outer ring to control a linear motor to move up or down, the tool feed amount is controlled, and therefore the vibration of the tool in the sharpening process is controlled. By means of the vibration control method, online real-time control over tool vibration is achieved, and the surface smoothness of a cutting edge of the tool, the quality of the cutting edge of the tool and the sharpening efficiency of the tool are improved.

The invention discloses an underneath alternating type knife rest numerical control lathe. The underneath alternating type knife rest numerical control lathe comprises a shell, a grasping mechanism, atail frame, a knife rest mechanism, a knife handle lifting mechanism and a knife rest transverse moving mechanism, the grasping mechanism is arranged on the shell, the tail frame is movably arrangedon two sliding base tables of the shell, the knife rest mechanism and the knife handle lifting mechanism are matched and movably arranged on the sliding base tables of the shell, and the knife rest transverse moving mechanism is in transmission connection with the knife handle lifting mechanism through a driving lead screw. The lower portion of a machine tool is fed from bottom to top, the gravitycenter of the machine tool is lowered, operation is stable, the length of the knife rest is shortened, tool vibration can be reduced, the machining precision and the rigidity of the machine tool areimproved, the contact condition of a tool and a workpiece can be visually and clearly observed, tool setting is convenient, and the machining progress is convenient to observe; and by arranging a toolmagazine, the number of replaceable tools is increased, the tool changing time is shortened, the machining efficiency is improved, installation and calibration of the cutters are simplified, use is more convenient and effective, and the machining time is saved.

The invention discloses a mixed-machining platform integrating the laser coaxial powder feeding technology and the five-axis linkage machining technology. More importantly, a sensor is used for measuring the size of a molten pool and the height of a cladding belt in real time in the machining process, parameters such as the power and operating speed of laser are dynamically adjusted by using the measured data, a laser molding mode with fixed parameters in the past is changed, the stability in the machining process is ensured, meanwhile, the mixed-machining platform further integrates an ultrasonic tool vibration system, and the quality of the surface being machined is improved.

A fixture for suppressing tool vibration on an outer rim, wherein a pressure claw base, an end face block and a base are installed on the chuck, and the pressure claw is installed on the chuck; a lower pressure plate is fixed on the base, limiting columns and an upper pressure plate are installed on the lower pressure plate, with steel balls and a rubber strip being enclosed in a space formed by the lower pressure plate and the upper pressure plate; and a rubber strip is enclosed in an annular groove formed by a jaw A and a jaw B, and can move radially in the groove. The fixture in the present invention is configured to counteract the vibration of the wheel rim during machining, and thus can effectively eliminate the problem of tool vibration on the outer rim.

A special hand tool for laying concrete blocks. The device includes a mini-hopper sized to hold the correct amount of mortar, a sluiceway, dimensioned to fill the normal joint space between blocks, an optional divider to accommodate both 4 inch and 8 inch nominal blocks, and a vibrator. The device has a handle that can also contain batteries for the vibrator. A mason can scoop up mortar while the tool is vibrating. When full, the vibrator can be stopped and the tool positioned to face the end of a block already set in a wall while the next block to be laid can be put in place on its mortar bed and pushed to the other face of the tool. The vibrator can then be re-started, and the tool vertically withdrawn leaving the mortar that was in the tool between the two block ends. The same tool can also be used to butter horizontal joints by running the vibrator only sufficiently to apply the correct amount of mortar. Alternatively, a second similar tool sized equal to the length of a block, containing exactly the right amount of mortar for a horizontal joint, can be used.

Processes for high speed machining of workpiece materials using high performance tools with prolonged tool life and improved surface finish are provided by vibrating the tool and / or the workpiece at a frequency greater than the frequency of shear localization in the primary shear zone or chip segmentation occurring in the absence of tool vibration, with an amplitude sufficient to break up the tool-chip atomic contact, thereby decreasing the tool-chip contact length through decreasing the tool-chip contact time, thereby suppressing accelerated chemical tool wear caused by dissolution of the tool into the workpiece by nanocrystalline grain boundary diffusion and grain boundary sliding mechanisms by preventing shear localization associated with nanocrystalline grain formation in the primary shear zone of the chip, and suppressing oxidation wear of the tool by preventing segmentation of the chip.

The invention discloses a high-precision bearing forge piece machining method. The machining method comprises the following steps of workblank detection, part reference machining, other end face machining, inner diameter cutting of a bearing outer ring, three times of detection, polishing and four times of detection. According to the machining method, the appearance and the interior of the workblank are detected before production, defective products are screened timely before machining, resource waste is reduced, and the qualified rate of finished products is improved. According to the machining method, a way of combining rough machining and finish machining is adopted for machining, so that the condition that the one-time cutting amount is large is avoided, poor tool vibration is reduced,and the service life of a tool is ensured; in the machining method, in the machining process of a whole lathe, cooling liquid at the temperature of 18-22 DEG C is adopted for cooling the machined part, the temperature difference change of the environment is ensured, the influence of the temperature on part machining is reduced, and machining precision is improved. Paint spraying marks are adoptedfor the defective products, so that distinguishing of the defective products is facilitated, and outflow of the defective products is effectively avoided.

The invention relates to a high-speed milling process experiment method and a test piece, in particular to a high-speed milling process experiment method for an integrated quenched steel concave surface test piece and the concave surface test piece. The high-speed milling process experiment method and the concave surface test piece are used for solving the problem that existing process data and design methods can not meet the requirement for efficiently machining quenched steel moulds. According to the high-speed milling process experiment method, the integrated quenched steel concave surface test piece with a variable-curvature upper surface is designed and machined, three tool cutting paths in different directions are made along the test piece through bulb milling tools, the experiment of cutting the upper surface of the integrated quenched steel concave surface test piece is conducted, the data of milling tool vibration amplitude and machined surface scallop height in the feeding direction of the milling tool and the milling width direction are acquired, the influence on the vibration of the milling tool and the shape of the machined surface from curvature changing of the quenched steel concave surface is tested, and a high-speed milling process scheme for the integrated quenched steel concave surface is given. The test piece is of an integrated cuboid structure and is composed of a bottom boss and a middle area to be cut. The high-speed milling process experiment method and the concave surface test piece meet the requirement for efficiently machining the quenched steel moulds.

The invention provides a self-powered downhole drilling tool vibration sensor based on a friction nanometer generator. The sensor comprises a shell used for being connected with a drilling tool; a sliding block which is arranged in the shell in a sliding mode, wherein a nanometer material film is arranged on the surface of the sliding block; a friction electrode which is arranged on a sliding path of the sliding block; the induction electrodes which are arranged in the shell at intervals along the sliding direction of the sliding block; and a single chip microcomputer which is respectively connected with the induction electrodes. The sliding block slides under the vibration effect of the drilling tool, the nanometer material film and the friction electrode are electrified through friction, electrostatic induction is generated between the induction electrodes and the electrified friction electrode, and the single-chip microcomputer detects the electric signals generated on the induction electrodes and calculates the vibration amplitude according to the position relation of the induction electrodes. The self-powered downhole drilling tool vibration sensor has the beneficial effects that the vibration amplitude and the vibration frequency of the drilling tool can be calculated, and the working safety condition of the drilling tool can be monitored; the axial vibration energy of the drilling tool is collected to supply power to the single-chip microcomputer, and the self power supply of the sensor is realized.