77 results about "Chatter mark" patented technology

The invention belongs to the technical field of milling of cast steel weak-rigidity structures and discloses a machining method of a large-sized large-tapered half-enclosure thin-walled cast steel housing. The machining method includes the steps of designing a housing machining process; allocating machining allowance; carrying out a clamping process; designing a milling tool path; selecting tool and cutting parameters. The machining method herein helps solve the problems that parts with poor rigidity are difficult to clamp during machining, interior and exterior profiles have large chatter marks, tools break easily, machining efficiency is low, product quality is unstable, and the application requirements cannot be met.

The sliding blade microtome is a tissue specimen cutting device including a specimen syringe and an adjustable cutting mechanism for diagonally slicing the specimen. The specimen syringe is a cylindrical shaft having a first end and a second end for holding and supporting a specimen. The first end has a diameter that is smaller than the diameter of the shaft, forming a compressed lip for applying pressure on the specimen prior to slicing by the blade. The pressure used to compress the gelatin and the specimen holds the gelatin and the specimen in a sturdy position to slice the specimen to precision without chatter marks. The specimen is pushed out of the first end of the specimen syringe by a motor mechanism or a manually adjustable micrometer drive.

The invention provides a fault feature extraction method and a fault feature recognition method of a vibration signal of a rolling mill chatter mark, and belongs to the field of rolling mill fault monitoring. The fault feature extraction method analyzes the vibration signal of the chatter mark via autocorrelation demodulation based on a second-order cycle, so unstable vibration signal of chatter mark is processed through frequency demodulation, a demodulated second-order cycle autocorrelation function is sliced according to time domain, and modulation information of the chatter mark vibration signal is kept completely. Therefore, accuracy of fault feature extraction of the vibration signal of the chatter mark is improved. The fault feature recognition method recognizes whether the rolling mill faults exist or not by the form of power spectrum information entropy, influence of rolling mill speed fluctuation needs not to be considered, and the recognition method is simple and accurate.

The invention belongs to the technical field of machining and discloses a method for milling and vibration-damping a blisk. The method comprises the following specific process steps of: (1) preparing a filling material according to the proportion; (2) melting the filling material; (3) mounting a pouring clamp; (4) pouring a filling agent; (5) condensing the filling agent at normal temperature, secondarily condensing the filling agent and checking the condensing state of the filling agent; (6) mounting a filtering clamp; and (7) carrying out the abutted milling processing and chip removal processing. By pouring the filling agent between the blisk and vanes in the milling processing of vane profile five coordinates of the blisk, the method enhances the rigidity of parts in the milling processing of the vanes, eliminates the chatter marks generated at the vent tip part of the vanes during milling and reduces the roughness of the surfaces of the vanes. Meanwhile, the rigidities of the parts and a clamping system thereof are enhanced, so that the milling feed rate is increased and the milling speed can be improved.

The invention discloses a metal and ceramic bonding agent and a preparation method of the metal and ceramic bonding agent, a CBN grinding wheel and a manufacturing method of the CBN grinding wheel. The metal and ceramic bonding agent is composed of, by mass fraction, 75%-92% of ceramic and 8%-25% of metal. The ceramic is composed of, by mass fraction, 40%-65% of SiO2, 8%-35% of B2O3, 6%-20% of Al2O3, 5%-18% of Na2O5, 0.5%-5% of CaO, 3%-10% K2O, 0.5%-2% of MgO and 2%-6% of TiO2. The metal is composed of, by mass fraction, 55%-80% of Cu, 15%-30% of Sn and 5%-20% of Ni. The metal and ceramic bonding agent can be used as a CBN grinding wheel bonding agent and overcomes the defects that in the grinding process of the ceramic CBN grinding wheel, the surface roughness of a workpiece is large, chatter marks are generated easily, and impact resistance is poor.

The invention provides a vibration suppression device for a rolling mill roller system, belonging to the field of automatic control of a rolling mill. The vibration suppression device comprises a vibration suppressor, a pressure setter, a servo amplifier, a servo valve, a hydraulic cylinder and a displacement sensor, when the rolling mill roller system vibrates, a vibration damping hydraulic cylinder vibrates together with the rolling mill roller system, the displacement sensor in the hydraulic cylinder outputs a vibration signal and sends the vibration signal to the vibration suppressor; after receiving the vibration signal from the hydraulic cylinder, the vibration suppressor processes and converts the vibration signal so as to output an oscillation signal to a feedback input end of the servo amplifier to control the action of the servo valve, so that oil entering the hydraulic cylinder oscillates, the oscillation of the oil is same as the original vibration in frequency and amplitude and opposite to the original vibration in phase, so as to suppress the vibration of the hydraulic cylinder; therefore, the vibration of the roller system is reduced and the chatter marks generated by a roller and band steel are suppressed.

The invention belongs to the technical field of machining, and relates to a method for controlling machining deformation of a thin-walled part. The method comprises the following steps that 1, a filling agent is prepared and molten, wherein the mass percent ratio of solid paraffin to liquid paraffin to rosin to glyceride is 9-10:1:1-1.5:1-1.5, the solid paraffin is heated so that half of the solid paraffin can be molten into liquid, liquid paraffin is added, mixed powder of rosin and glyceride is added while stirring, and heating is carried out till the solid paraffin is fully molten into liquid; and 2, the filling agent is poured, wherein the part needing pouring is protected, the liquid filling agent is poured after being cooled for 5 minutes-10 minutes, cooling is carried out for 3 minutes after pouring the liquid filling agent by a quarter of volume, the liquid filling agent continues to be poured by a quarter of volume after liquid cannot flow, the step is repeatedly executed till the part needing to be supported is fully covered through pouring, cooling is carried out for 6 hours-8 hours at the natural temperature after pouring is finished, and then subsequent machining can be carried out. The method is used for controlling machining deformation of the part, machining chatter marks on the surface of a blade are eliminated, and subsequent polishing treatment on the blade is greatly reduced.

The invention provides a processing method for a piston rod assembly. When an annular groove of a piston is processed, a 4 mm groove cutter is used for performing rough turning firstly, then a 2mm small-sized groove cutter is used for slowly turning a groove bottom excircle through cutting for two times to eliminate chatter marks, the groove is narrowed properly under the premise that the hardness is guaranteed, so that the transverse deformation of the groove subjected to carburization and quenching is still within the common difference required; 0.4-0.5 mm allowance of the total is taken out and is subjected to completely turning firstly, then an upper grinder is assembled, so as to control the concentricity, and guarantee the overall precision; chamfers and bottom diameter dimension of the excircle required when threads are subjected to thread rolling are subjected to completely turning on a numerically controlled lathe firstly, then threads are rolled, so as to guarantee the linear type of threads while ensuring concentricity; a piston and a piston rod are assembled by a spanner, so as to guarantee that the centers of the piston and the piston rod are positioned on the same operating horizontal plane; the torque is adjusted to guarantee the torque force, and the piston and the piston rod are tightly screwed; after the piston rod assembly is completely assembled, the bending deformation during grinding is remarkably reduced when the upper grinder is subjected to overall grinding, so that the straightness and concentricity during the grinding of the integral piston rod assembly are well guaranteed.

The invention belongs to treatment devices of gears, and particularly relates to a gear upper tooth groove polishing device. A cross shaft is fixedly mounted on a rack, a gear is mounted on the cross shaft, and a supporting frame is hinged to the rack. A lead screw is mounted on the supporting frame, a sliding sleeve is mounted on the lead screw, a push plate is mounted on the sliding sleeve, and the free end of the push plate deeply penetrates a gear tooth groove. The lower end of the supporting frame is connected with a first connecting rod, and a vertical supporting plate is hinged to the end, away from the supporting frame, of the first connecting rod. A first rotary wheel is mounted on the vertical supporting plate, a cam is arranged on the side, away from the vertical supporting plate, of the first rotary wheel, and a second rotary wheel is arranged above the cam. An inductor is mounted on a high-pressure gun at the position, above the second rotary wheel, of the rack, the high-pressure gun is connected with a first through pipe, and the first through pipe is connected with a sand spraying box. The left end of the first through pipe is connected with a hollow rotary shaft, a plurality of sand spraying holes are formed in the rotary shaft, a hollow sand spraying wheel is mounted on the rotary shaft, and small holes are formed in teeth of the sand spraying wheels. The problem that due to the fact that the polishing process of saw teeth on a gear is uneven, chatter marks are likely to exist on the polished gear is solved.

The invention relates to a superhard material cutting tool and a preparation method thereof, which belongs to the technical field of superhard material. The superhard material cutting tool comprises a steel matrix and a cutting tool bit. The cutting tool bit consists of a polycrystalline diamond compact (1) and a diamond tool bit (2); 1 to 12 inclined cylindrical tanks used for welding the diamond compact are distributed on the outer circle surface of the steel matrix, and the center line of the inclined cylindrical tank forms a cutting angle with the cutting face; the diamond tool bit is welded on the surface of the steel matrix. The polycrystalline diamond compact is combined by PCD and cemented carbide matrix and is sintered from the mixture of diamond and the metal powder after being compacted; the structure thereof is in the shape of cylinder, ladder or squareness; the fringe area of the clad compact is the cutting blade. The superhard material cutting tool solves the materials hard to be processed in the cutting field, and ensures the surface of the machined part free of burr, nick, spray and chatter mark; the cutting and grinding combination not only improves the cutting speed, but also ensures the cutting quality.

The invention provides a torsional vibration suppression device for rolling mill, belonging to the field of automatic control of a rolling mill. The torsional vibration suppression device comprises a motor current transformer, a motor rotation speed transformer, a torsional vibration suppressor and a roller-motor speed difference transformer. When a main transmission system of a continuous rolling mill has torsional vibration, the torsional vibration suppressor can simulate a compensating signal with the same frequency and amplitude as the torsional vibration and can send the compensating signal to an input end of a current adjustor in a main transmission control so that current of a motor generates vibration to suppress the torsional vibration of the main transmission system, the aim of suppressing the horizontal vibration of the rolling mill is reached, and chatter marks generated by a roller and band steel are suppressed further.

The present invention discloses a method for detecting strip steel chatter marks of a tandem mill. The method synchronously acquires each technical parameter of the tandem mill and the information of rotating speed, vibration, steel rolls and so on in the operation process of the tandem mill. The early warning policy for processing the information by different frequency bands is adopted. The method determines the frequency band range of dynamic wave filtering according to the real-time speed of the tandem mill so as to determine wave filtering results. The integrated early warning of the chatter marks is generated corresponding to roll diameter parameters used for production, and the results of the early warning are explained. The method directly monitors the chatter marks, and gives out early warnings for the chatter marks generated by various reasons, so that the batch production of disqualified products is avoided. The method also can correspondingly search steel rolls with chatter marks according to the information of the steel rolls. The method plays an active role in improving product quality, reducing roll surface wear and improving production efficiency.

The invention discloses a production technique for edible oil filter paper, which is characterized in that bleached softwood pulp is taken as a main raw material; and the mercerization processing for the raw material is carried out by adopting alkali liquor. The technique also comprises a winkling processing, i.e. a scraper is contacted with paper sheets, thus chatter marks are generated on the paper sheets because the paper sheets is provided with different speed at the time of passing through the squeezed part and the dried part and the scraper is arranged on the squeezed part; the chatter marks can increase the gap and the filter area among a plurality of layers of filter papers, reduces the filter resistance of a plurality of layers of filter papers, strengthens the air permeability and simultaneously enhances the broken strength resistance of the filter paper; the production cost of the technique is low; and the filter papers produced by the invention are only YMB ****/ton compared with the price of the same type of the existing import filter papers (about YMB *** /ton).

The invention discloses a method for finishing and grinding a large accurate threaded hole and a grinding tool. The grinding tool mainly comprises a grinding bar body, a threaded face matched with the threaded hole is machined and formed on the outer circle end face of the grinding bar body, grinding paste with proper granularity is selected to coat the threaded face of the grinding bar body and/or the threaded surface inside the threaded hole, the grinding bar body is screwed into the threaded hole for repeated grinding, all microcosmic protruding parts on the inner threaded surface of the threaded hole can be grinded away gradually through the pressure between the threaded face of the grinding bar body and the threaded surface inside the threaded hole and the polishing function of grinding material particles of the grinding paste, and therefore the defects of tiny scratches, cyclone milling chatter marks, large-area serious corrosion and the like on the threaded surface are overcome, it is guaranteed that the size precision of the large threaded hole is met, meanwhile, excellent threaded surface quality is obtained, the effect is uniform, repair risks are low, the operation process is easy to quantize and control, and the method and grinding tool are used for the technical field of large threaded hole machining.

The invention belongs to the technical field of continuous casting of metal, and relates to a continuous casting crystallizer casting blank chatter mark control method. The continuous casting billet chatter mark control method is characterized in that molten metal pouring is performed on a continuous casting crystallizer meniscus area and the position above thereof, and a heat insulation material is additionally arranged on the inner wall or the outer wall of the crystallizer so as to reduce heat exchange flowing at the meniscus area and the position above thereof, thereby weakening the initial solidification of the molten metal at the meniscus. The meniscus area and the position above thereof subjected to the molten metal pouring is the area that is the sum of the two lengths which respectively are the distance between a position 30-50 mm below a molten metal top surface of the crystallizer and an upper opening of the crystallizer and the distance between the molten metal top surface and the upper opening of the crystallizer. According to the method provided by the invention, chatter marks on the surface of a casting blank can be reduced or eliminated, so that the surface quality of the casting blank can be improved and the casting blank can be free from support processing of grinding.

The invention relates to a device for grinding rollers, also for grinding hollow rollers. As the rollers tend to vibrate transversally as a result of the contact with the grinding disc, a cushioned body is applied to the opposite side of the roller from the grinding disc, said body being engaged pneumatically against the roller and adapting at least partially to the contours of the roller. The cushioned body consists of an elastic solid material or an elastic external skin that is filled with an elastic pressurized medium. The engagement pressure of the cushion is adjustable. This is achieved by a pneumatic advance cylinder located on a base, said cylinder having a piston that can be impinged on both sides and that bears on its piston rod a fixing plate comprising the elastic cushion. The advance cylinder is connected to compressed air conduits, P indicating the conduit comprising a pressure regulator and L indicating the return conduit in the standard case. The invention thus provides a device for damping vibrations, which suppresses any regenerative chatter and guarantees a grinding pattern that is devoid of chatter marks.

The invention provides a whirlwind milling machine for chamfering of a large bar, relating to the milling machine for the chamfering of the large-diameter bar. The milling machine consists of a machine body, a head stock, a cutter, pressing devices, a material feed device and axial position sloping blocks, wherein servo motors are symmetrically arranged on two ends of the machine body; the head stock is connected with the servo motors through screw nuts and screws; and the cutter is arranged on the main shaft of the head stock. The milling machine is characterized in that vertical beam frames are arranged on two sides of the upper part of the machine body, and two cross beams are arranged on the upper part of the vertical beam frames; the pressing devices are arranged on the cross beams; two V-shaped irons are arranged on the table of the machine on the lower parts of the pressing devices; the material feed device is arranged in a groove in the middle of the machine body; and the axial position sloping blocks are symmetrically arranged on two sides of the material feed device. The whirlwind milling machine has the advantages of novel structure, no chatter mark, high manufacture accuracy, high manufacture efficiency and the like, is simple in manufacture and assembly, is convenient to operate, and is a novel large bar chamfering whirlwind milling machine integrated with economy and practicality.

The invention discloses a smooth optimization design method of a cam profile. The smooth optimization design method comprises the following steps that the base circle radius, the measuring head radius and the original profile table of the original cam are subjected to interpolation calculation by a spline function, and the new base circle radius is obtained; the center position of the cam is calculated through the new base circle radius; the center position of a measuring head is calculated through the engagement relationship of the new base circle radius and the measuring head radius of the original cam; the position relationship of the center position of the measuring head and the center position of the cam is obtained through the calculated center position of the measuring head; the relationship of the center position of the measuring head and the center position of the cam is substituted into the spline function, and corresponding polar angles and polar diameters are obtained; and the obtained polar angles and the polar diameters are used for generating a new profile table. The smooth optimization design method has the advantages that the smooth optimization on the profile table of the cam can be realized, so the optimized profile table is used for processing cams with smaller chatter marks.

The invention discloses an abrasive belt polishing device, which comprises an engine base, a transmission device and a tailstock device which are arranged on the engine base, an electromotor, an abrasive belt rack device, a winding device and a polishing rack device, wherein the transmission device and the tailstock device are provided with ejector pins arranged oppositely and used for clamping a workpiece; the electromotor is arranged on the engine base and is used for driving the ejector pins on the transmission device to rotate; the abrasive belt rack device is arranged on the engine base and is used for winding an abrasive belt; the winding device is arranged on the engine base and can be used for automatically winding the abrasive belt which exceeds a preset length after a one-time polishing process; and the polishing rack device is arranged on the engine base and is used for compressing the abrasive belt to a polishing face of the workpiece. According to the abrasive belt polishing device, the surface roughness of the cam workpiece reaches below Rz3.2, the chatter marks and the closed angles on the surface of the workpiece are eliminated, and the product quality is improved.

The invention discloses a prediction and optimization control method of a machining chatter mark defect of an oil casing screw splicer and relates to the technical field of petroleum equipment manufacturing. According to the prediction and optimization control method of the machining chatter mark defect of the oil casing screw splicer, for rules and characteristics of screw machining chatter mark occurrence, on the basis of practical big data of the chatter mark occurrence situation, data mining, reliability analysis and optimization design theory methods are alternately applied, in particular, an improved K-means clustering algorithm is adopted to carry out data mining, an improved non-dominated sorting genetic algorithm is adopted to implement chatter mark defect control and optimization, and the prediction and optimization control method of the machining chatter mark defect of the oil casing screw splicer is provided; compared with the prior art, the prediction and optimization control method of the machining chatter mark defect of the oil casing screw splicer can improve the precision degree of oil casing screw machining chatter mark prediction, and effectively prevent chatter marks.

The invention discloses a machined part surface chatter mark defect detection method which comprises the following steps: measuring acceleration response signals of a cutter along the horizontal and vertical directions of a machine tool in the current machining process of a part, filtering cutter-pass harmonic components in the acceleration response signals, extracting wavelet entropy characteristics reflecting machining instability intensity in the acceleration response signals, and calculating the chatter mark defect of the machined part, recording the wavelet entropy characteristics as a vibration characteristic; inputting the vibration characteristics into a pre-trained flutter detection model, and judging the flutter state of a current weak-rigidity machining system for machining thepart; and if the part is in the flutter state, the current machining surface of the part has the chatter mark defect. After each part is machined, according to the accuracy of the current flutter detection model, on the basis of an existing flutter detection model, an incremental learning mode is adopted, continuously-accumulated actual measurement vibration information is utilized, some information which can have adverse effects on judgment precision is eliminated step by step, and therefore the accuracy of the flutter detection model is improved, and the accuracy of the flutter detection model is improved. And the detection precision of the machined surface chatter mark defects is high.

The invention discloses a grating roller surface circumference dividing machine which comprises a machine head box, a worktable and a machine tool body. The worktable comprises a large carriage, the machine tool body is provided with an X-axis rail and a large carriage transmission assembly, the X-axis rail is used for allowing the worktable to move along the X axis, and the large carriage is arranged on the X-axis rail and is driven to move along the X-axis rail through the large carriage transmission assembly. A transverse sliding plate is arranged on the large carriage, the large carriage is further provided with a Y-axis rail and a transverse sliding plate drive assembly, the Y-axis rail is used for allowing the transverse sliding plate to move along the Y axis, and the transverse sliding plate is arranged on the Y-axis rail and is driven to move along the Y-axis rail through the transverse sliding plate drive assembly. The transverse sliding plate is provided with a workpiece clamping assembly. By means of the improvement of a machine tool structure, the grating roller surface circumference dividing machine has the advantages that machining precision is greatly improved, the grating roller scale surface roughness Ra is 0.8, the distance error between scales is 0.005 mm, chatter marks do not exist on the scale surfaces, and grating roller machining efficiency is improved by 100%.

The invention discloses a grinding chatter mark detection method for a mill roll shaft neck. The method comprises the following steps of: cleanly wiping the mill roll shaft neck, a grinding machine bracket and a support pillow, uniformly coating lubricating oil on the outer surface of the shaft neck and the bearing surface of the support pillow, placing mill rolls on a grinding machine, opening the grinding machine, and performing rotary grinding on the shaft neck, wherein the rotation speed is not less than 20rpm, and the rotation time is not less than 5min; visually checking the shaft neck and the support pillow in natural light, removing mill rolls with light and shade patterns on the outer surface of the shaft neck and/or mill rolls for forming light and shade patterns on the bearing surface of the support pillow, and feeding residual mill rolls into the next detection link as middle qualified products; and irradiating the outer surface of the shaft neck with a strong-light flashlight, and visually checking to remove the mill rolls with light and shade patterns on the outer surface of the shaft neck, thus obtaining the mill rolls without the light and shade patterns as final qualified products. According to the detection method disclosed by the invention, chatter marks on the surface of the mill roll shaft neck can be conveniently and accurately detected, and hidden dangers, such as surface scratches on the mill roll shaft neck, can be avoided, so that the surface of the mill roll shaft neck is effectively protected.

The invention provides a twenty-high roll mill chatter mark monitoring system and method based on an angular domain and belongs to the field of roll mill chatter mark monitoring. The system comprises a twenty-high roll mill, an encoder, a first acceleration sensor, a second acceleration sensor and a monitoring device, wherein the encoder is mounted at one side of a working roll; the first acceleration sensor is mounted on a bearing bush of a third supporting roll, from left to right, of the upper half part; the second acceleration sensor is mounted on a bearing bush of a second supporting roll, from left to right, of the upper half part; the encoder sends a triggering signal to the monitoring device, and the monitoring device calculates a rotating speed of the roll mill according to the triggering signal; the encoder triggers the first acceleration sensor and the second acceleration sensor to collect an angular domain vibration acceleration signal and send the angular domain vibration acceleration signal to the monitoring device; and the monitoring device calculates a parameter characteristic value according to the angular domain vibration acceleration signal. According to the twenty-high roll mill chatter mark monitoring system and method disclosed by the invention, an angular domain signal analysis manner is adopted to improve the accuracy of the twenty-high roll mill chatter mark monitoring.

The invention discloses a grinding process of a thin-wall and long-roller roller surface. The grinding process comprises the following steps of: during grinding, injecting a liquid substance to a cavity of a roller body; after the liquid substance is fully filled, raising the pressure to be 0.3-0.5MPa and hermetically maintaining the pressure; and then conventionally grinding, wherein the liquid substance is water. According to the grinding process disclosed by the invention, the defect of poorer rigidity of a hollow roller is overcome; and by injecting the liquid substance to the cavity of the roller body, maintaining a certain pressure and damping the liquid substance, the rigidity of the roller body and the grinding smoothness of the surface are increased, grinding chatter marks are eliminated and the grinding roundness and the processing efficiency are improved. The grinding process disclosed by the invention has the advantages of simpleness for operation, low cost, high precision, high efficiency and the like.

The invention provides a staggered-tooth molded high-gloss chamfer milling cutter. The staggered-tooth molded high-gloss chamfer milling cutter comprises a cutter handle and a cutter head, wherein thecutter handle and the cutter head are integrally molded; the cutter head comprises a first cutter edge, a second cutter edge, a third cutter edge and a fourth cutter edge which are successively and clockwise arranged at the end of the cutter handle, are tilted outwards and share the front end surface. Through a staggered-tooth structure and the parameters of the cutter edges, two adjacent chamfered surfaces of liquid metal can be processed in one process; meanwhile, subsequent supplement processes are not needed, so that the high-gloss effect can be achieved; the molded chamfered surfaces arefree of chatter marks, burrs and line marks and are high in gloss and high in yield; the production efficiency is greatly improved; the cost is reduced; the rigidity of the cutter edges is ensured; the chipping resistance is avoided; the service life of the staggered-tooth molded high-gloss chamfer milling cutter is prolonged.