129 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.

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 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.

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.

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 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.

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.

The invention discloses a 3D printing method based on ultrasonic welding additive manufacturing and electric spark forming. According to the method, the two high and new technologies of ultrasonic welding additive manufacturing and electric spark forming are combined, and a high-precision ultrathin metal sheet is subjected to layered ultrasonic welding; and after each layer is welded, the spark erosion technique is adopted to form a vacant part on the cross section of the layer according to the component CAD model cross section needs, and forming is performed layer by layer until final forming is completed. The 3D printing method has the advantages of being small in ultrasonic welding pressure, low in temperature, firm in solidification and the like together with the characteristics that an electric spark forming electrode is low in vibration, small in size, high in forming precision and the like. The defects that common 3D printing precision is low, bonding is not firm, the inside is hollow and the suspended portion needs to be supported are overcome. The difficulties that tool fillets occur in other 3D printing, the tool size cannot be small, tool vibration is high, and the precision of a top layer 'ceiling' cannot be guaranteed are eliminated. Overall precision forming of a component with a 3D inner cavity can be achieved, and a breakthrough is provided for simplifying the component structure, reducing the component size and improving product accuracy.