152 results about "Sheet metal bending" patented technology

The utility model discloses a laser welding device for sheet metal processing, relates to the technical field of sheet metal processing, aims to solve the technical problem that a current laser welding machine is inconvenient to quickly weld and process multiple groups of bent edge gaps of a square box-shaped sheet metal, and comprises a laser welding machine. According to the utility model, the fixed platform is designed and consists of the base, the pushing structure and the driving structure, so that the square box-shaped metal plate can be directly inserted into the driving structure when the bending edge gap of the square box-shaped metal plate is welded, and then the pushing structure is controlled to abut against the square box-shaped metal plate; at the moment, the square box-shaped metal plate is fixed through a first jacking and pressing disc on the jacking and pushing structure and a second jacking and pressing disc on the driving structure, and then the square box-shaped metal plate can be directly driven to rotate through the driving structure, so that the adjustment of the gap of the bent edge of the square box-shaped metal plate can be rapidly completed; and therefore, the laser welding machine can quickly complete welding work on four groups of bent edge gaps of the square box-shaped metal plate.

The invention relates to the technical field of metal plate detection, and discloses a metal plate bending defect detection method and system based on industrial vision, and the method comprises the steps: obtaining original image data, and obtaining a denoised image through Gaussian filtering; a technological parameter set is obtained, and a technological parameter deviation index is obtained through normalization and mean value deviation calculation; extracting edge features of the denoised image by using a convolutional neural network, segmenting according to a preset fixed threshold to obtain a defect width region, and counting and filtering to obtain an initial defect width value distribution set; associating the parameter deviation index with the initial distribution set to calculate an adjustment factor, weighting to obtain an accurate defect width value distribution set, mapping the accurate defect width value distribution set with the process parameter set, and fusing the de-noised image and the parameter deviation to obtain a defect tracing path; and extracting textural features according to the defect tracing path, judging the linkage influence of crack propagation and a mold gap, and determining an optimized process parameter scheme in combination with a preset database. The method can improve the defect detection precision and the production process adjustment efficiency.

The application relates to the technical field of sheet metal processing equipment, and discloses a sheet metal bending machine with precise positioning function, which comprises a workbench, a first cavity and a second cavity are arranged in the workbench, the first cavity is located on the left side of the second cavity, the first cavity and the second cavity are in communication, an adjusting mechanism and a bidirectional mechanism are arranged in the first cavity; a vertical plate is fixedly installed on the right side of the top of the workbench, a horizontal plate is fixedly installed on the top of the left side of the vertical plate, a bending mechanism is arranged on the horizontal plate, a first seat hole and two second seat holes are arranged on the top of the workbench, the two second seat holes are respectively located on the front side and the rear side of the first seat hole, and a clamping seat is slidably installed on the top of the workbench. The sheet metal bending machine has the following advantages and effects: the first clamping mechanism and the second clamping mechanism are arranged, the sheet metal workpiece clamping stability can be improved, and the sheet metal workpiece can be prevented from being deviated during the bending process, so that the bending quality is affected.

The invention discloses a multipurpose adjustable metal plate bending die and a working principle, and relates to the technical field of bending dies. According to the multi-purpose adjustable metal plate bending die and the working principle, the multi-purpose adjustable metal plate bending die comprises an angle adjusting structure and a pressing plate structure, a base is arranged on the lower side of the angle adjusting structure, a two-way worm is arranged in the base, transverse sliding blocks are arranged on the two sides of the two-way worm, the transverse sliding blocks are connected with a movable base, four guide rods are arranged in the base, and the movable base is connected with the movable base. Four guide sliding sleeves are arranged on the lower side of the movable seat and coaxially connected with guide rods, a connecting seat is connected to the upper side of the movable seat, a connecting plate is arranged on the upper side of the connecting seat and connected with a push rod, the push rod is connected with a rotary supporting plate in a hinged mode, and the rotary supporting plate is connected with a left half template and a right half template. And the left half template and the right half template are connected through a connecting shaft.

This invention relates to the field of bending machine technology, specifically to a high-efficiency, energy-saving heavy-duty CNC bending machine, which includes a bending chamber. A partition is provided inside the bending chamber, and a bending device for bending sheet metal is provided inside the partition. The bending device contains bending dies for different sheet metal bending shapes, and a limiting plate for controlling the position of the sheet metal is also provided inside the bending device. Changing devices for convenient die rotation are provided on both sides of the partition. The changing device contains a slide rail assembly for limiting the position of the bending device. This invention bends the sheet metal using the bending device and replaces the bending dies using the changing device and slide rail assembly.

The utility model belongs to the technical field of sheet metal processing, and relates to a sheet metal bending device which comprises a base, an upper bending die is arranged above the base in a lifting mode, a first movable plate is arranged on the top of the base in a rotating mode, a lower bending die is fixedly connected to the top of the first movable plate, and the lower bending die is matched with the upper bending die. A sliding block is horizontally arranged on the top of the base in a sliding mode, a second movable plate is hinged between the sliding block and the first movable plate, a lifting piece is arranged above the base, and the lifting piece drives the upper bending die to vertically move up and down. A transmission part is arranged on the base, and when the lifting part drives the upper bending die to move, the transmission part drives the sliding block to horizontally slide. The lower bending die has the advantages that one end of the first movable plate is jacked up by the second movable plate through the sliding block, the lower bending die is rotated to be in an inclined state, a plate can slide onto a slope, automatic discharging is achieved, a new plate can be directly placed, and working efficiency is improved.

1. The name of the design product: bending machine. 2. The use of the design product: for sheet metal bending processing. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The utility model provides a sheet metal plate pressure adjusting device, which relates to the technical field of sheet metal plate processing and comprises a bending table, a V-shaped bending seat arranged at the top of the bending table, a support column arranged at the top of the bending table, a cylinder seat arranged on the support column, a hydraulic cylinder arranged on the cylinder seat and an adjusting component arranged on the outer side of the hydraulic cylinder. According to the sheet metal plate pressure adjusting device, the sheet metal plate can be rapidly fixed to the V-shaped bending base through the clamping assembly, displacement of the sheet metal plate in the bending process is prevented, the stability of the sheet metal plate can be improved, bending force can act on the sheet metal plate more evenly, operation and use are convenient, the sheet metal plate is rapidly disassembled and assembled, and the working efficiency is improved. And the pressure of the hydraulic cylinder can be accurately controlled through the adjusting assembly, the bending size and shape precision of the sheet metal part is ensured, the production efficiency is improved, the pressure can be controlled and adjusted, manual intervention is reduced, and the production speed is increased.

The utility model relates to the technical field of metal plate bending, and discloses a metal plate bending device of a JP cabinet comprehensive distribution box, which comprises a base, the top of the base is fixedly connected with a top plate, the outer wall of the top plate is provided with a driving assembly, one side of the top plate is provided with a mounting rod, and the interior of the mounting rod is slidably connected with a mounting plate. A bending head is fixedly connected to the bottom of the mounting plate, a lower mold is fixedly connected to the top of the base, and a connecting assembly is arranged in the mounting rod; the connecting assembly comprises a mounting pin. According to the metal plate bending device, after the mounting bolt is unscrewed, the cone is separated from the ball, the ball is separated from the mounting groove, the mounting pin is separated from the mounting plate and the mounting rod, and then the bending head is replaced by separating the mounting plate from the mounting rod, so that the effect of conveniently replacing the bending tool bit is achieved, and the problem that the bending tool bit cannot be replaced when the bending tool bit of the metal plate bending device is replaced is solved. And the problem that a tool needs to be matched for unscrewing a screw is solved, and the convenience of the metal plate bending device is improved.

The utility model provides a kind of roll conveyor with drop guide matched with jacking transfer machine, it is related to logistics equipment technical field, solve the problem that when existing jacking transfer machine is matched with roll conveyor, there is no physical limiting mechanism, material receiving is not accurate, and it is easy to cause trouble by material jamming.The utility model includes a group of symmetrically installed roll bracket on the rack of jacking transfer machine, several parallelly connected roll between two roll bracket, the middle upper end of two roll bracket is equipped with drop guide bracket, the drop guide bracket is a bracket plate with angle by sheet metal bending tailor welding.The utility model has the beneficial effects that: it can ensure that material falls on roll conveyor, maintain stable operation of logistics system;Simple structure, firm and reliable, save manufacturing cost.

This invention provides a processing method for a certain type of thin-walled irregularly shaped parts, including stamping, bending, and welding. The irregular shape of the thin-walled irregularly shaped parts is mainly at both ends; the middle section can be formed by simple sheet metal bending. However, these thin-walled irregularly shaped parts come in various length specifications. The method of this invention is as follows: Step one, a set of stamping dies is used to form the complex end features, symmetrically forming components, wire-cutting components, and removing excess material through trimming and grinding; Step two, different length specifications of the middle section are formed by bending; Step three, the final shape is completed by welding. This invention can process and manufacture a certain type of thin-walled irregularly shaped parts with various length specifications.

The utility model discloses sheet metal bending equipment, which belongs to the technical field of sheet metal processing and comprises a pair of supports, a pair of positioning rollers, an air cylinder and a U-shaped block. Wherein the bottoms of the pair of brackets are connected with a placing plate; a mounting table is arranged on the placement plate, and an inverted-L-shaped mounting frame is arranged on the mounting table; the pair of positioning rollers is installed between the pair of supports through connecting shafts, and a plurality of first positioning grooves of different sizes are formed in the positioning rollers. The air cylinder is mounted on the inverted-L-shaped mounting frame; the U-shaped block is detachably connected with a piston rod of the air cylinder; by means of the design, the U-shaped blocks of different sizes can be rapidly replaced according to different bending requirements, and flexible bending of metal plate strip-shaped materials of different diameters can be achieved.

This utility model discloses a sheet metal bending machine mold fixing and protection device, including a lower mold and an upper mold of the bending machine. An installation mechanism is installed on both sides of the surface of the upper mold, and a moving mechanism is installed inside the installation mechanism. A protective mechanism is installed inside the moving mechanism, and limiting bolts are inserted at both ends of the moving mechanism. This utility model uses installation bolts to thread a mounting plate to the upper mold of the bending machine, allowing two sets of guide rods to be installed on both sides of the upper mold surface. This enables the installation rods to mount a protective baffle. The protective baffle provides protection and shielding during bending between the lower and upper molds. Furthermore, the sliding block along the inside of the guide rods allows for adjustment of the protective baffle, facilitating the blocking of materials of different sizes. The limiting bolts, by pressing against the surface of the guide rods, limit the movement of the sliding block.

The utility model relates to the technical field of workpiece bending, in particular to a plate bending machine which comprises a machine frame and two supporting plate sets, the supporting plate sets are fan-shaped assemblies, the two ends of each supporting plate set are fixedly connected with supporting shafts with the axes horizontally arranged, the supporting shafts are rotationally connected with the machine frame, the supporting shafts and the fan-shaped assemblies are coaxially arranged, and the fan-shaped assemblies are fixedly connected with the supporting shafts. The supporting plate set is provided with a supporting plane, the supporting plane can synchronously move along with a bent plate, a friction mechanism is arranged between the supporting plate set and the rack, and the friction mechanism can form sliding friction force on rotation of the supporting plate set around the axis of the supporting shaft. The device can solve the problem that when a traditional bending structure treats a thin plate or a large-span plate, due to insufficient supporting, the middle portion droops and deforms to a certain degree, the supporting plane can adjust the angle in a self-adaptive mode along with the deformation curve of the plate, lower supporting is continuously provided, and therefore the bending angle is more uniform, the shape of a bending line is more regular, and the bending quality is improved. And the bending quality and consistency are improved.

The present application provides a central warehouse as the center of flexible sheet metal processing production line and its method, proposes the processing production solution applied to sheet metal laser blanking and sheet metal bending, so as to be compatible with order production and pre-investment production operation, realize the arrangement of laser and bending unit with the central warehouse as the center, optimize the process matching, ensure the consistency of multi-process route, reduce the transportation frequency and improve the overall production and management efficiency. The flexible sheet metal processing production line with the central warehouse as the center comprises a warehouse storage and transportation unit, a laser cutting unit and a manual bending unit are connected and operated on one side of the warehouse storage and transportation unit, and a robot automatic bending unit and a manual set matching picking unit are connected and operated on the other side of the warehouse storage and transportation unit.

The utility model discloses an adjustable sheet metal part bending and forming device which comprises a base plate, a bending device, an adjusting device and a bending device. The pressing part is fixedly connected to the mounting frame; the bending assembly comprises a driving part, a rack, a gear and a bending plate, the bending plate is rotationally connected to two mounting plates, the mounting plates are fixedly connected to the base plate, one end of the bending plate is connected with the gear, the gear is meshed with the rack, and the rack is connected to the driving part; and the positioning block is located on one side of the bending plate, the positioning block is located below the pressing component, and a positioning groove is formed in the positioning block. Compared with the prior art, the small-sized metal plate bending machine is simple in structure, convenient and fast in small-sized metal plate bending operation, low in energy consumption and high in efficiency.

The utility model discloses a metal plate bending jig which comprises a fixing plate, a positioning strip, a nitrogen spring, a lifting plate and a linear driving motor. The top rear end of the fixing plate is provided with a positioning strip capable of sliding back and forth, the front section is provided with a through hole, and the bottom is provided with a nitrogen spring. The lifting plate slides up and down through cooperation of the sliding blocks and the positioning rod sliding grooves, and plates are placed when the top is flush with the positioning strips. The linear driving motor drives the positioning strip to move back and forth to adapt to different plate thicknesses. The positioning strip is provided with a positioning groove and a positioning pin, and an indicating grating is arranged at the rear end of the fixing plate to assist accurate positioning. After the plate is pressed, the hydraulic device presses the lifting plate downwards, bending is achieved through the fall between the positioning strip and the lifting plate, and the two ends are prevented from tilting. The bending device is compact in structure, accurate in positioning and adjustable in gap, and bending safety and machining efficiency are effectively improved.

The utility model relates to the technical field of sheet metal part bending, and discloses a sheet metal part bending device which comprises a base, sliding grooves are symmetrically formed in the upper surface of the base, sliding blocks are slidably mounted in the two sliding grooves, supporting plates are symmetrically and fixedly connected to the upper surface of the base, and a connecting shaft is fixedly connected between the two supporting plates; a plurality of movable grooves are formed in the side wall of the connecting shaft, connecting rings are rotationally installed in the movable grooves, and the side walls of every two corresponding connecting rings are jointly and fixedly connected with a lower die base which is arranged in an inclined mode. The driving motor drives the sliding block to move, then the position and angle of the lower die base are adjusted, meanwhile, the upper die base can be replaced through the fixing assembly, the bending requirements of different sheet metal parts can be met, and the applicability of the device is greatly improved.

The utility model relates to the technical field of bending equipment, and discloses industrial fan-shaped sheet metal part bending equipment which comprises a machine body, a rectangular plate is arranged above the front end of the machine body, a table body is fixedly installed at the bottom of the front end of the machine body, and inserting plates are movably installed in the table body and the rectangular plate. And an upper mold is fixedly mounted below the inserting plate at the upper end. An insertion plate is inserted into a table body and a rectangular plate, a bevel block extrudes a telescopic spring, the telescopic spring deforms, the bevel block completely shrinks into a movable groove, the telescopic spring releases elastic potential energy to push the bevel block into a rectangular groove, the bevel block pushes a pressing plate to move outwards, and the pressing plate is pressed into the rectangular groove. Compared with traditional industrial fan-shaped sheet metal part bending equipment, the industrial fan-shaped sheet metal part bending equipment has the advantages that the installation steps are simplified and the use efficiency is improved through an insertion installation mode.

The utility model discloses a precise sheet metal bending machine, which relates to the technical field of sheet metal bending machines and comprises a sheet metal bending machine main body, a second adjusting mechanism is arranged on the outer side of the sheet metal bending machine main body, and the lower end of the second adjusting mechanism is rotatably connected with a mounting shell. By the adoption of the structure, the first driving motor operates, so that the output end of the first driving motor drives the screw to rotate in the mounting groove of the metal plate bending machine body, the lifting base in threaded connection with the outer side of the screw slides, and the lifting base indirectly ascends and descends through the mounting arm; the controller below the mounting plate can be adaptively adjusted in height for use according to the figure and use condition of a user, on the basis that the mounting arm rotates on the shaft seat through the connecting shaft, the output end of the second driving motor indirectly drives the mounting arm to rotate on the shaft seat, and the horizontal use position of the controller can be adjusted; and therefore, the practicability of the metal plate bending machine main body is greatly improved.

The utility model discloses an automobile metal plate bending device which comprises an operation table and a frame body, the top of the operation table is connected with the frame body, the bottom of the operation table is connected with a supporting base, a rubber pad is embedded in the top of the operation table, the side face of the frame body is connected with a strip-shaped plate, and scale marks are arranged on the top of the strip-shaped plate. The inner side of the strip-shaped plate is slidably connected with a transverse plate. According to the automobile metal plate bending device, a strip-shaped plate is installed on the top of an operation table, a transverse plate is connected to the inner side of the strip-shaped plate in a sliding mode, a pressing screw rod and pressing plates are installed in a reinforcing plate, the pressing screw rods on the tops of the pressing plates are screwed, the pressing plates on the two sides are pressed on the top of a metal plate, and before the metal plate is bent, the pressing plates on the two sides of the strip-shaped plate are clamped; and plates of different specifications and sizes can be pressed tightly, and the plates of different lengths can be clamped and fixed conveniently in the using process.

The utility model relates to the technical field of trimming of mechanical sheet metal parts, and provides a portable trimming and bending clamp for sheet metal parts, which aims at solving the problems that the sheet metal parts can shrink when being bent, various matched special bending dies are needed especially for sheet metal bending parts with inclined bending lines, the processing cost is high, and the processing period is long. An adjustable fixing pressing plate used for fixing a sheet metal part and a replaceable die are arranged at the top of the top plate, the rotating plate rotates around the rotating shaft, the sheet metal bending pressing plate adjusts the position of the bending working face of the sheet metal bending pressing plate through an adjusting assembly, and the sheet metal bending pressing plate is arranged above the top plate. The tail end of the adjusting assembly of the rotating plate is fixedly connected with the rotating handle used for pushing the rotating plate to rotate, the rotating handle is pushed to enable a sheet metal part to be bent according to the shape and the angle of a selected mold, and sheet metal workpieces with different thicknesses can be trimmed only by adjusting the two adjusting assemblies. And bending at different angles is realized by utilizing the configured dies with different bending angles.

The utility model discloses a metal plate bending arc angle overturning die, which relates to the technical field of metal plate bending dies and comprises a base used for mounting and fixing a bending mechanism and a discharging mechanism. The number of the bending mechanisms is two, the two bending mechanisms are symmetrically arranged, and the two sets of bending mechanisms are used for bending the sheet metal part; the discharging mechanism comprises two side plates, the two side plates are both located between the two sets of bending mechanisms, the two side plates are symmetrically arranged, an outer containing groove is jointly formed in the tops of the sides, close to each other, of the two side plates, inner containing grooves are formed in the two side walls of the interior of the outer containing groove, and the inner containing grooves are communicated with the outer containing groove. A discharging push rod is movably arranged on the inner side of the outer containing groove. According to the sheet metal part bending device, sheet metal parts can be pushed out after being stamped and do not need to be manually taken down, and the bending efficiency of the sheet metal parts is effectively improved while manpower is saved.

The utility model relates to the technical field of numerical control machining of sheet metal parts, in particular to a bending device for numerical control machining of sheet metal parts. In order to solve the problems that the bending precision of the sheet metal part is affected due to the fact that the sheet metal part is easy to deviate when being manually placed, and the bending efficiency is affected due to the fact that the sheet metal part is difficult to take after being bent. When the design is used, a sheet metal part is firstly placed on a placing plate, a hydraulic telescopic rod is started to drive a fixing plate on a sliding block to fix the sheet metal part, a hydraulic mechanism is started to drive a bending head on a lower pressing plate to move towards the position of a bending part, stretching of the peripheral bending position of the sheet metal part and extrusion of the inner bending position of the sheet metal part are reduced, and the sheet metal part is fixed. And in cooperation with a lifting assembly, a lifting plate at one end of a sliding rod on a connecting plate is lifted by starting an air cylinder, the demolding work of the sheet metal part can be completed more quickly, an operator can take the sheet metal part conveniently, the working efficiency is improved, and the using effect is good.

The invention relates to the technical field of sheet metal part bending processes, and discloses a bending process verification method and system based on multi-source parameter linkage, and the system comprises a drawing information acquisition module, an automatic parameter calling module, a parameter analysis and calculation module, a bending process quadruple verification module and a verification result output module. The method comprises the steps of obtaining design parameters of a bent part through a design drawing, receiving empirical values input by a user, completing automatic calling of the parameters through a built-in material mapping function and a built-in equipment mapping function, calculating key process parameters through a preset mathematical formula based on output parameters and a calling result of a primary parameter calling layer, and determining the bending degree of the bent part on the basis of the key process parameters. And performing quadruple verification on the bending process by combining a calling result of the secondary parameter calling layer, outputting process guidance data, realizing automatic parameter mapping, and compressing process analysis time.

The utility model relates to the technical field of sheet metal machining, in particular to a multifunctional composite sheet metal bending auxiliary tool. The device comprises a bending cutting die, a U-shaped connecting block is arranged on the outer side of the bending cutting die in a sliding mode, a first adjusting device is arranged on one side of the U-shaped connecting block, a second adjusting device is arranged on the other side of the U-shaped connecting block, the first adjusting device comprises a first connecting block, and an inner groove is formed in the first connecting block. According to the sheet metal part bending device, the push plate pushes the sheet metal part to move towards one side close to the bending cutting die by rotating the screw rod sleeve, and when the sheet metal part is moved to a proper position, the sheet metal part is extruded by the extrusion plate through elastic thrust applied to the second connecting rod by the spring, so that the sheet metal part is supported and fixed; the sheet metal part does not need to be supported when a worker bends the sheet metal part, so that the working intensity of the worker is reduced, and the possibility of safety accidents caused by fatigue or misoperation of the worker is reduced.

The application discloses a left-right double-head laser automatic welding jig system and a welding method, relates to the technical field of laser welding, and is suitable for automatically loading two sheet metal bending pieces in a left-right balanced arrangement mode, and then performing laser welding on the left-right corner joint seams of the sheet metal bending pieces in the jig. The system comprises a jig body, an opening and closing mechanism, a seam-reducing and pressing mechanism, left-right double laser welding heads, a detection interlocking unit and a control unit. The jig body is provided with a bearing platform, a fixed reference piece and a center limiting piece. The sheet metal bending pieces are sleeved on the fixed reference piece. The center limiting piece is located between the two sheet metal bending pieces and presses the two sheet metal bending pieces outward in an elastic sliding mode. When the in-place state of the opening and closing mechanism and / or the seam-reducing and pressing mechanism and the gap value of the corner joint seam meet the preset welding conditions, the control unit triggers the left-right double laser welding heads to perform synchronous welding, and when the conditions are not met, the control unit implements ignition interlocking. Therefore, the stability of the corner joint seam and the welding quality consistency are improved.

The utility model discloses a kind of thin-wall sheet metal bending wrinkle-preventing edge-pressing mechanisms, it is related to sheet metal processing technical field, including bending machine workstation, the surface of bending machine workstation is provided with limiting support component and feeding assembly;The limiting support component includes two rectangular installation grooves opened in the surface of bending machine workstation, the inside of the rectangular installation groove is provided with several limiting support rollers;The feeding assembly includes the strip-shaped guide shell fixed in the surface of bending machine workstation, the inner wall of the strip-shaped guide shell is rotatably connected with driving screw.The utility model is by being provided with limiting support component, can effectively prevent the wrinkle when thin-wall sheet metal bending, guarantee processing quality, and multiple limiting support rollers form stable support to sheet metal part bottom, and support strip block can be self-adapting height adjustment under the action of support spring, ensure that the sheet metal part of different positions can be closely attached support roller, reduce the deformation caused by unstable support.

The utility model discloses a generator radiating fan blade of sheet metal bending forming, including the installation ring, the outer surface fixedly provided with the fan blade main part of installation ring, the installation ring is equipped with in the outer surface of installation shaft, is equipped with the insertion hole on installation shaft, the insertion hole is movably provided with the insertion rod, and the second limit board is fixedly arranged in the insertion rod top, and the insertion rod is equipped with the clamping groove, and the installation shaft is equipped with the clamping assembly cooperation with clamping groove, and the second limit board bottom is equipped with the limit component cooperation with installation ring and installation shaft. The utility model discloses through the innovative clamping and location structure, has simplified the complex process of traditional fan blade disassembly, makes maintenance personnel complete disassembly in short time, compares traditional mode to save time effectively, is especially suitable for the industrial scene of frequent maintenance, and the limit component and clamping structure synergistic effect, still through multiple mechanical constraint has improved the structural stability and the fatigue resistance of fan blade operation time obviously.