108results about How to "Improve dynamic stiffness" patented technology

The invention discloses an electric spindle semi-active vibration control test stand, a system and an electric spindle control method, wherein the electric spindle semi-active vibration control method comprises the following steps: through a processor, an electric spindle torsional coupled vibration signal is separated by using an experience modal decomposition and Hilbert transformation method so as to obtain a test frequency and a test phase; through an electric spindle intensive parameter equivalent mechanical model and the design parameter of the electric spindle system, the theory frequency and theory phase of the bending vibration and the torsional vibration of the electric spindle are obtained; through a force synchronizing vibration control model, the testing frequencies of the bending vibration and the torsional vibration of the electric spindle are combined, the test phase, the theory frequency and the theory phase are combined, so that a first pulse-width modulation (PWM) signal of a magneto-rheological absorber used for controlling the bending vibration and a second PWM signal of the magneto-rheological absorber used for controlling the torsional vibration are generated respectively. Therefore the bending vibration and the torsional vibration of the electric spindle can be synchronously controlled.

The invention discloses an automatically expanding and shrinking scraping-rolling combined deep hole cutter. A scraping part of the cutter comprises at least one pair of scrapers, a top block, and a reset device; the top block is positioned in the centre of a thick boring head body and is provided with a taper structure, and a corresponding conical surface is jacked by an endocentric end of the scraper; and the reset device is arranged between each matched pair of scrapers for resetting the scrapers; and a rolling part of the cutter comprises a rolling path and a keeper. The combined boring head also comprises a manipulating device which comprises a first driving part and a second driving part, wherein the first driving part drives the keeper to move axially along a spindle, and the second driving part penetrates a centre hole and acts on the top block in order to drive the top block to move axially along the spindle. The cutter disclosed by the invention is compact in structure, high in processing precision, convenient to use, and can expand and shrink automatically.

A cutter servo micro-feeding mechanism relates to a part processing displacement mechanism, is based on a voice coil motor and is characterized by being fast, high in frequency response and accuracy, large in journey, multiple in shock buffer effect, double in pre-tightening effect and good in cutter cutting rigidity and force conductivity. The cutter servo micro-feeding mechanism is provided with a flexible hinge, a base, an elastic connection rod, an adapter plate, an elastic connection rod adjustment nut, an end cover, a spring adjustment nut, a voice coil motor stator, a voice coil motor rotor, an air hydrostatic guideway inner rail, a capacitance displacement sensor, a sensor support frame, an air hydrostatic guideway outer rail, a lathe tool, a tool bit clamp, a transmission shaft, a pre-tightening nut and a disc spring.

The invention discloses a large and heavy numerical control static-pressure revolving platform. In the invention, a constant-current static-pressure closed guide rail is used for axial unloading and positioning; a constant-current opposed oil cavity is used for radial positioning; a radial damping oil cylinder is used for locking and applying Coulomb frictional damping; a double-lead worm gear isused for precision scale division; a closed loop control system consists of round gratings; and the revolving platform has high scale division accuracy, repeated location accuracy, heavy load and high rigidity and can realize accurate location at any angles and bear heavy cutting load. The large and heavy numerical control static-pressure revolving platform disclosed in the invention mainly comprises six parts of a supporting part, a scale division rotating part, a closed guide rail part, a worm part, a round grating full closed loop part and a radial locking part. The processing and assembling process of the large and heavy numerical control static-pressure revolving platform can improve the accuracy and the production efficiency of the static-pressure revolving platform, reduce the manufacturing cost and meet the requirement of the industrialization of large high-grate numerical control machine tools in China for large and heavy numerical control static-pressure revolving platforms.

A tunable or tuned boring bar having increased stiffness is provided. Increasing the stiffness of the bar increases the natural frequency, thereby reducing directional deformation of the bar during use. The tunable boring bar includes a distal portion configured to support a tool, a proximal portion configured for attachment to a support structure of a metalworking machine, and a body, which is at least partially tubular, extending between the proximal portion and the distal portion. The tubular portion of the body has an elongated cylindrical cavity. The body of the boring bar includes a core layer formed from a first material and a coating layer formed from a second material. The second material has a higher modulus of elasticity than the first material. In certain configurations, the coating layer is bonded to the core layer by cladding, welding, chemical adhesives, chemical vapor deposition, pulsated plasma diffusion, or combinations thereof.

The invention relates to a structure for connecting a swing arm lining with a sub vehicle frame. The inner framework of the swing arm lining is flat; the two ends of the swing arm lining are protruded out of a middle rubber body and a lining outer pipe; a bolt hole is formed in each of the two ends of the swing arm lining; a through hole is formed in a sub vehicle frame; a threaded casing pipe is arranged in the sub vehicle frame; the bolt holes, the through hole and the threaded casing pipe are communicated with one another; a sink which is toward the inner side is formed in the part, corresponding to each of the middle rubber body and the lining outer pipe, on the sub vehicle frame; the swing arm lining is fixedly connected with the sub vehicle frame in the way that a bolt is matched with the threaded casing pipe. In the technical scheme, due to the fact that the sub vehicle frame is flatly stuck to the inner framework, abnormal sound caused when the inner framework of the swing arm lining moves in the manner of being relative to a gear-starting structure is avoided, and the promotion of NVH (Noise Vibration and Harshness) is benefited; due to the fact that secondary welding of the frame is not required, the rigidity of a mounting part is high, and meanwhile, the mounting space is saved; due to the fact that the sub vehicle frame is molded by drilling and casting a complete plate, the drilling precision is high, and the production is easy to control; due to the fact that the threaded casing pipe is adopted, the assembling process is simple.

A morphing aircraft (100) includes a body (20) and a frame (30) connected to the body. The body (20) includes a transmission mechanism (26). The frame (30) includes a main supporting arm (31), a cross rod (33) and a spiral power mechanism (34). The main supporting arm (31) is connected to the transmission mechanism (26) of the body (20). The cross rod (33) is connected to the main supporting arm (31). The spiral power mechanism (34) is arranged on the cross rod (33). The transmission mechanism (26) includes a screw (261), at least two nuts (262, 263) screwed to the screw (261), and a nut adaption connector (265) that sleeves one of the nuts. The at least two nuts (262, 263) are connected mutually. The main supporting arm (31) is connected to the nut adaption connector (265). The dynamic stiffness of the whole aircraft is improved, the dynamic stiffness of the morphing aircraft during morphing and flying is achieved, the flying performance is improved, and also costs are reduced.

The invention provides a structure of an automobile rear suspension spring installation point with strong dynamic rigidity, high durability and light weight. The structure includes a rear suspension spring seat mounting plate, a support plate and a rear floor side longitudinal beam body, and also includes a first partition plate and a second partition plate. The rear floor side longitudinal beam body is a U-shaped channel steel beam in section, and the support plate It is an L-shaped support plate, the side of the L-shaped support plate is fixedly connected with the side of the rear floor side longitudinal beam body, and the top surface of the L-shaped support plate is respectively connected with the bottom surface of the rear suspension spring seat mounting plate and the groove top of the rear floor side longitudinal beam body The surface is fixed, the first partition and the second partition are respectively arranged on the sides of the rear floor side longitudinal beam body corresponding to the installation point of the L-shaped support plate, and the first partition and the second partition are both U-shaped in cross section channel steel, the groove tops of the first partition and the second partition are respectively vertical and flush with the groove tops of the side longitudinal beam body of the rear floor, and the sides of the first partition and the second partition are vertically aligned with the side longitudinal beams of the rear floor The sides of the beam body are fixed.

The invention discloses a bidirectional multi-arch large-caliber space reflector, and belongs to the technical field of precision machinery of optical systems. The reflector comprises a reflector surface and a back matrix, wherein open lightweight holes and supporting holes are formed in the back matrix, and the back matrix has a stiffened plate type structure; and grooves are formed in the back matrix, and the back matrix is in a bidirectional multi-arch shape formed by multiple radial arches and multiple annular arches. By adjusting the arrangement of the grooves and changing the mass distribution of the reflector along two directions, the mass of the matrix is lightened under the condition that the stiffness of the structure of the reflector is not reduced, the specific stiffness of the structure is improved, the structure is reasonable, and great lightweight is realized. The specific design examples show that the mass of the reflector can be reduced by 24.5 percent compared with a flat-back reflector. The reflector has the advantages of low self-weight deformation, reasonable stiffness distribution and light mass, and is suitable for a large-caliber space telescope system.

A method for processing a hard tooth surface of a medium-precision large-modulus cylindrical gear is characterized in that a double-parameter non-instantaneous-pole enveloping method is carried out to perform tooth surface generating enveloping and hard milling, namely, a cutter is used for performing weft enveloping along the circumference contour direction of the gear and then performing warp enveloping along a helical line direction of the tooth surface of the gear. According to the method, a large-diameter disc milling cutter, which is provided with a large-space chip storing groove and is high in cutting stiffness and convenient and reliable in blade fixing manner, is utilized, so that a cutter disc is outstanding in comprehensive high-speed hard milling performance; a coated carbide blade is used for achieving high-speed hard milling of hardened steel; the form of the geometric structure of the blade can effectively improve the dynamic stiffness and thermal stiffness and can also reduce the influence of force and heat on a workpiece and the blade, and as a result, the durability of the blade can be improved.

The invention belongs to the technical field of automobile bodies, and relates to an automobile body rear force transmission structure and an automobile, and the automobile body rear force transmission structure comprises a rear suspension mounting piece, a rear wheel cover internal reinforcing plate, a rear wheel cover front joint, a rear wheel cover rear joint, a rear wheel cover external reinforcing plate, a rear wheel cover inner plate, a rear wheel cover outer plate and a rear longitudinal beam joint. According to the automobile rear force transmission structure, an H-shaped force transmission channel in the inner side covers the rear suspension stress area and dispersedly transmits force to the rear longitudinal beam joint, the rear floor cross beam, a spare tire pool cross beam andthe upper portion of the rear side wall, and the force transmission efficiency of the rear suspension area (especially a three-connecting-rod rear suspension area) is greatly improved; and the dynamicstiffness, the NVH performance and the fatigue durability of a rear shock absorber area are improved. The automobile body rear force transmission structure is suitable for an automobile model with asteel-aluminum hybrid automobile body matched with a three-connecting-rod rear suspension. Under the condition that a floor frame beam structure is not added, after the automobile body rear force transmission structure is adopted, the weight of the automobile body can be reduced by about 3 kg.

The invention provides an internal and external thread grinding machine capable of realizing in-situ modification of a grinding wheel. An A-shaft rotary table (10) is arranged on a rotary table base (11); the A-shaft rotary table (10) can rotate on the rotary table base (11); a rotating shaft is defined as a shaft A and rotates in the X-axis direction; a large-diameter grinding wheel can be installed on a grinding wheel headstock (6); angle adjustment of the large-diameter grinding wheel or a small-diameter grinding wheel is achieved through the rotating shaft A; a shakable angle dresser (8) is fixed to the side surface of a workpiece headstock (4) and is used for generating a certain oscillation angle; the shakable angle dresser (8) consists of a rolling wheel rotating mechanism (81), anoscillation angle guide mechanism (82) and an angle driving mechanism (83); the oscillation angle guide mechanism (82) and the angle driving mechanism (83) are both installed at the side surface of the workpiece headstock (4); the rolling wheel rotating mechanism (81) is installed on the oscillation angle guide mechanism (82); the angle driving mechanism (83) can be used for driving the oscillation angle guide mechanism (82) to rotate; and the rolling wheel rotating mechanism (81) can be used for trimming a large-diameter grinding wheel installed on the grinding wheel headstock (6) or a small-diameter grinding wheel installed on an inner grinding head component (12) to realize in-situ modification of the grinding wheel.

The invention discloses a topology optimization-based cobweb-like interlayer rib plate composite structure design method, which comprises the following steps of: 1, performing a static analysis on an original structural component to obtain a deformation cloud chart; 2, performing a topological optimization design on the structural component to obtain a topological optimization unit pseudo-density diagram; 3, finding the position of a largest deformation zone from the deformation cloud chart of the structural component; 4, arranging annular regular parallels and regular meridian lines of the structural component; 5, determining the arrangement density of the regular meridian lines; 6, arranging irregular meridian lines on some parts of the component; 7, combining the topology optimization to obtain a hollow component structure; 8, making a thin layer plate on the upper layer of the cobweb-like interlayer rib plate to fully envelope the cobweb-like rib plate, so that the middle interlayer becomes a composite structure of the cobweb-like rib plate; and 9, repeatedly improving the original component according to the steps. The invention has scientific concept and a novel structure, can meet the requirement of aerospace on light weight design, and has good practical value and wide application prospect in the engineering and technology field.

The invention provides a latch component, a locking mechanism and a vehicle, and relates to the technical field of vehicle manufacturing. The latch component comprises a reinforcement plate fixedly mounted in a set area of a vehicle body, and a latch arranged in an area, opposite to the reinforcement plate, of the vehicle body and fixedly connected with the reinforcement plate through at least two bolts, wherein the reinforcement plate is positioned at the inner side of the vehicle body; and the latch is positioned at the outer side of the vehicle body. The latch component, provided by the invention, can improve static stiffness and dynamic stiffness of the connected area of the vehicle body and the latch, so that high-frequency components in door closing sound generated in the closing of a vehicle door are decreased, low-frequency components are increased, the door closing sound is deep, and the quality of the door closing sound is improved. The locking mechanism comprises the latch component provided by the invention; and the vehicle comprises the locking mechanism provided by the invention.

The present invention provides a connection structure of an anti-torque pull rod and an auxiliary frame. The connection structure comprises the anti-torque pull rod and an auxiliary frame installation part; the anti-torque pull rod comprises large and small bushes and a pull rod support; the large and small bushes are installed inside first and second installation holes in the pull rod support; the large bush comprises a large bush inner tube, a large bush rubber body and a large bush outer tube; the large bush inner tube penetrates through the first installation hole, two large bush assembling parts stretch sideward along the axial direction of the hole, and each assembling part is provided with a large bush installation hole whose axis is perpendicular to the hole axis; the auxiliary frame installation part comprises a recess; upper plates, lower plates and support inner tubes disposed between installation plates and the lower plates are disposed at two sides of the recess; the installation plates are also provided with installation plate through holes; the large bush is installed in the recess, and fasteners penetrate through the large bush installation holes and the installation plate through holes and are connected with the support inner tubes. According to the embodiments of the present invention, excellent dynamic stiffness is maintained in all directions of the anti-torque pull rod and the auxiliary frame installation part, and automobile noise, vibration, harshness (NVH) performance can be raised.

The invention provides a robot end effector suitable for large thin-walled workpiece grinding and a grinding system, and belongs to the technical field of machining. The effector comprises a base connected to a robot, a driver is connected to the base, a movable seat is connected to the end, away from the base, of the driver, a length-adjustable connecting rod is arranged above the base, and the upward extending end of the connecting rod is connected with the movable seat. The grinding system comprises a carrying robot and a grinding robot which are arranged at the left end and the right end of a thin-walled workpiece respectively, the output end of the carrying robot is connected with an end effector with a force control function, the grinding robot is connected with an end executor witha vibration reduction function, the upper end and the lower end of the thin-walled workpiece are fixed, and the left end and the right end of the thin-walled workpiece are free. According to the robotend effector, grinding of large thin-walled workpieces can be achieved, and vibration during grinding is reduced.

The invention relates to a rear apron board of an automotive body. The rear apron board comprises a board body and is characterized in that the left lower part of the board body is provided with a first X-shaped reinforcing rib, and the right lower part of the board body is provided with a second X-shaped reinforcing rib; the middle upper part of the board body is provided with a first horizontal reinforcing rib, the middle lower part of the board body is sequentially provided with a second horizontal reinforcing rib, a third horizontal reinforcing rib and an S-shaped reinforcing rib from top to bottom; and a first vertical reinforcing rib and the second vertical reinforcing rib are arranged between the first horizontal reinforcing rib and the second horizontal reinforcing rib. Because the rear apron board is provided with the first X-shaped reinforcing rib and the second X-shaped reinforcing rib, local rigidity of the point of the reinforcing ribs is improved, the additional arrangement of a reinforcing plate at the reinforcement point is avoided, the weight of the automotive body is reduced, and the cost is saved. Because the two horizontal reinforcing ribs and the two vertical reinforcing ribs are connected in a square shape, the static rigidity and the dynamic rigidity of a metal plate at the point are obviously improved, and the vibration resistance is improved.

The invention provides an anti-torque pull rod, which comprises a large-end bushing, a small-end bushing and a pull rod bracket, wherein the large-end bushing comprises a large-end bushing inner pipe,a large-end bushing rubber body and a large-end bushing outer pipe; the large-end bushing outer pipe is provided with a notch, one end of the pull rod bracket penetrates through the notch to be connected with the large-end bushing inner pipe, the other end of the pull rod bracket is connected with the small-end bushing, the large-end bushing outer pipe is provided with a first fixing hole, and the first fixing hole is used for allowing a fixing piece to penetrate through and fixing the large-end bushing outer pipe to an auxiliary frame. The invention further discloses an anti-torque pull rodmounting structure. The anti-torque pull rod of the anti-torque pull rod mounting structure is the anti-torque pull rod; the anti-torsion pull rod mountingstructure further comprises an auxiliary frame, the auxiliary frame comprises an upper layer plate and a lower layer plate, the upper layer plate and the lower layer plate form a mounting opening, second fixing holes are formed in the upper layer plate and the lower layer plate, the large-end bushing is arranged in the mountingopening, and the fixing piece penetrates through the first fixing hole and the second fixing hole to fix the large-end bushing outer pipe to the auxiliary frame.

The invention provides a method for preparing a damping vibration attenuation composite coating on the surface of a rotary machine thin-shell component, and belongs to the technical field of materials. The method comprises the following steps of (1) by utilizing the rotary machine thin-shell component as a base body, putting the base body in a vacuum chamber of a filtering electric arc ion plating machine; (2) preheating the base body after vacuumizing; (3) charging argon, starting the filtering electric arc ion plating machine, and depositing a titanium coating on the surface of the base body; (4) depositing a Ni60Cr33.7Al4.5Y1.8 alloy coating on the surface of the titanium coating; (5) depositing a magnesium aluminum alloy coating on the surface of the Ni60Cr33.7Al4.5Y1.8 alloy coating to prepare the damping vibration attenuation composite coating on the surface of the base body. The method for preparing the damping vibration attenuation composite coating further has the following characteristics that the pretreatment on the base body does not break the surface structure of a blade; the influence of the low preheating temperature on the structural characteristics of the material of the blade is small; the selected materials of the coating are common without being limited by conditions, such as purchase; the technique is simple, the stability is high, and no pollutants, such as dust and waste gas, in a cleaning process are generated.

The invention relates to an experimental device of a feeding mechanism of a linear motor. According to the technical scheme, the experimental device is characterized in that a connecting plate is bridged to a base I and a base II, and two ends of the connecting plate are respectively movably connected with the base I and the base II through a chute; a measuring instrument bracket is bridged to the base I and the base II; two ends of a supporting frame I are respectively fixed to the base I and the base II, wherein the supporting frame I is movably connected with the connecting plate through a connector; two guide rails I are arranged on the base I; buffers I are arranged at two ends of the base I; a slide plate I is glidingly connected with the guide rails I; two guide rails II are arranged on the base II; buffers II are arranged at two ends of the base II; a slide plate II is glidingly connected with the guide rails II; a supporting frame II fixed to a slide plate III is arranged at one end of the base II. The experimental device is also provided with a detection system, an electrical cabinet and a control system. With the adoption of the experimental device of the feeding mechanism of the linear motor, the performances of the linear motor can be detected.