31 results about "Laser bending" patented technology

A step type variable speed scanning method for accuracy control of laser bend forming belongs to the technical field of plastic forming. A laser coating material is coated on the scanning area of a surface to be scanned, a sheet material to be detected is clamped on one side, the scanning speed of the scanning area is determined by the diagram method to generate the step type variable speed scanning scheme corresponding to the scanning area, and finally the sheet material to be detected is scanned and processed according to the step type variable speed scanning scheme in a laser numerical control manner. The measure and check after processing are performed after the sheet material is cooled naturally. The method of the invention can effectively reduce the phenomenon of border effect, enhance the forming accuracy of the sheet material, thereby realizing the different energy output of the different heating area to balance the geometric constraint of the sheet material and improve the border effect.

The invention discloses a laser bending forming method of a thin-walled tube and a special device used for realizing the method. The method adopts two laser beams to act on the thin-walled tube, wherein one laser beam is used for heating the thin-walled tube to soften the thin-walled tube and producing thermal stress along the thickness direction of the tube wall so as to cause the tube to bend and deform; the other laser beam forms a plasma on the surface of the tube, and further bends the thin-walled tube by the shock action produced by the plasma to obtain a fine grain structure. The special device for realizing the laser bending forming method of the thin-walled tube is composed of a laser generator system, a laser head system, a workbench system and a motion control system. By adopting the method, metal and alloy tubes made from steel, aluminum, copper, titanium and the like can be machined, which is a high-flexibility dieless forming technology.

The invention provides a progressive bending sheet metal which is manufactured with the method of laser bending forming. According to the laser bending forming method, proper and unique technological parameters are chosen, deformation of the sheet metal is controlled accurately, and the progressive bending sheet metal is obtained at last. Interval between passes of the sheet metal is preferred to be 1.5-2mm, and reciprocating scanning time of each pass is preferred to be 10 times, diameter of a laser beam spot is 0.1mm, power is 20-25W, scanning speed is 15-20mm, and curvature of the sheet metal obtained at last is about 0.05-1mm.

The invention relates to a wearable vital sign monitoring device. A laser light source of the wearable vital sign monitoring device is used for emitting laser to a sensing optical fiber; two ends of the sensing optical fiber are respectively connected with a laser light source and a photoelectric conversion module; the sensing optical fiber is bent after bearing the pressure of pulse or breathingor heartbeat movement of a human body, and a laser signal transmitted in the sensing optical fiber is lost at a bent part and is modulated based on a bending loss principle; the photoelectric conversion module is used for converting the modulation signal of the laser bending loss output by the sensing optical fiber into an electric signal representing the pulse or breathing or heartbeat movement of the human body; and a vital sign signal extraction module is used for extracting the corresponding human body pulse or breath or heartbeat frequency from the electric signal representing the human body pulse or breath or heartbeat movement. According to the invention, the vital sign information of the human body can be accurately monitored in real time.

The invention belongs to the field of metal sheet laser bending forming, and particularly relates to a reverse laser forming method for a single-segment arc surface of a metal sheet. The reverse laserforming method can be used for rapid bending and forming of a single-segment arc surface or a multi-segment arc surface structure of the metal sheet. Considering the influence of the spacing of a scanning line on the smoothness of the formed arc surface, the reverse laser forming method can finish the route planning for the arc surface expected to be formed by reversing the spacing of the scanning line and the bending angle of each scanning line, the laser power, laser defocusing amount, laser scanning speed and scanning times on each scanning line are changed to ensure that the bending angleof each scanning line is the same, and the high-precision laser rapid bending and forming of different types of arc surfaces is achieved. The reverse method of the arc surface can guide the precise,rapid and flexible bending and forming of the specific arc surface effectively, and ensure the smoothness of the arc surface as much as possible under the appropriate small spacing of the scanning line; at the same time, through similar means, multi-segment arc surface processing can be completed.

The invention provides a method for forming an arc groove in a metal plate by adopting a laser flexible bending forming technology. The method can be used for rapid bending forming of groove structures of single arc lines, different arc combined lines and the like of metal plates. According to the method, on the basis of a temperature gradient mechanism, when a laser scans the metal plate, a laser scanning line region can generate an obvious temperature gradient along the laser scanning paths and then can generate the non-uniform thermal stress distributed along a scanning line so that three-dimensional curved surface deformation of the plate can be generated; and the arc groove is formed according to the expected shape, the shape of the laser scanning line, all the laser parameters of each scanning path and the laser scanning frequency of each path are changed, proper path planning is combined, and therefore rapid high-precision laser bending forming of arc grooves of different types can be realized.

The invention provides a method for achieving laser bending metal plate forming through a pre-stretch-bending method. Resilience can be reduced to a large extent, and then the bending angle of a plateis increased. The method comprises the steps that firstly, a formed workpiece is fixed to a three-dimensional numerical control platform, one end of the workpiece is fixed through a clamp, and a stretch bending device firstly applies longitudinal tension and then applies transverse pressure to the other free end of the workpiece; and then the upper surface of the plate is heated in a scanned modeby using laser, finally, after the hating area of the plate is completely cooled, the stretch bending device is removed, and the transverse pressure and the longitudinal tension are relieved. A largenumber of literatures prove that the stress state inside the plate can be changed under bending force, more tangential pressure stress generated on the inner side of a neutral layer of the laser heated area is converted into tensile stress, the whole cross section of the plate is under the action of the tensile stress in the tangential direction, and after relieving, resilience of inner-layer fibers and outer-layer fibers counteract each other so that the resilience can be greatly reduced, and then the bending angle of the plate is increased; and the method is suitable for forming of high-hardness, high-brittleness and difficult-to-deform and medium-thickness plate materials, and has a great application prospect in the fields of aerospace, medical treatment and automobile manufacturing.

The invention provides a laser bending forming method for a knife switch knife holder. The laser bending forming method can be used for die-free rapid bending forming of the knife switch knife holder.Firstly, based on a temperature gradient mechanism, when laser scans a metal plate, a laser scanning line area can generate uneven thermal stress due to the temperature gradient, so that the plate isbent towards a laser beam, and meanwhile, a scanning area generates new residual stress and strain distribution; and secondly, based on the buckling mechanism, laser scanning is conducted on the pre-bent back face position, and under the influence of residual stress and strain generated by pre-bending, the plate is bent in the direction opposite to the laser beam. When a knife holder sample pieceis formed through laser, high-precision laser rapid bending forming of knife holders of different sizes and shapes can be achieved by changing laser parameters and the number of laser scanning timesof all paths in combination with proper path planning.

The present invention has been made to provide a laser bending process estimation apparatus, a laser bending process estimation program, and a laser bending process estimation method capable of estimating a result of a laser bending process without an actual workpiece.

A laser bending process estimation apparatus that estimates a result of a bending process performed using a laser beam comprises: a process condition acquisition section 1 that acquires a process condition of the bending process; an analysis model creation section 3 that creates an analysis model based on the process condition acquired by the process condition acquisition section 1; and an analysis section 5 that performs heat transfer analysis and heat stress analysis based on the analysis model created by the analysis model creation section 3 to calculate an analysis result of the bending process.

The invention discloses a bending and forming method of a thin silicon wafer, which scans the thin silicon wafer by utilizing Nd:YAG pulse laser and provides power and temperature conditions for bending the thin silicon wafer by thermal action of laser and a thin silicon wafer material. In the bending and forming method, extra temperature environment does not need to be provided in the stage of laser scanning, the bending and forming mainly utilize the thermal action of the laser and the thin silicon wafer material to realize the plastic characteristic of the silicon wafer, and further are realized by stress difference generated by different temperatures on the upper surface and the lower surface. In the bending and forming method, 1064nm pulse laser is utilized to realize bending and forming of the silicon material with the thickness being 0.1mm-0.3mm, a 30-degree bending angle can be obtained, the bending quality is good, simultaneously, the operation is convenient, and the technology is simple, so that the bending and forming method is beneficial to realizing automatization. The laser bending technology adopted by the invention belongs to a non-contact processing form, has no contact damage to the surface of the material, and can effectively avoid damage caused by being contacted with external force in the bending process of the silicon wafer.

The invention belongs to the technical field of laser bending forming of fiber metal laminates, and relates to a method for improving laser bending forming precision of a single curved surface of a fiber metal laminate. According to the invention, an upper and lower layer alternate scanning laser bending forming method is adopted, and the elastic recovery deformation of a bending area in laser multi-channel scanning bending forming is corrected. And the upper-layer metal laser bending forming and the lower-layer metal pre-bending laser bending forming based on the temperature gradient mechanism are alternately carried out until the target bending angle is reached. And the lower metal layer and the upper metal layer are plastically deformed, so that the elastic recovery of the formed bending area caused by the interference of subsequent scanning is inhibited. And the single-curved-surface laser bending forming precision of the fiber metal laminate is improved, the internal residual stress of the plate is reduced, and the single-curved-surface technical requirements of the metal laminate are met.

Provided is a flow rate measuring device capable of ensuring sufficient signal intensity even with a low output light source. The flow rate measuring device that detects a flow velocity of a fluid flowing through an object by a Doppler effect of light, the flow rate measuring device includes a light source unit that emits laser light to the object, a light receiving unit that receives the laser light scattered by the object, and a light bending member that bends the laser light emitted from the light source unit and causes the laser light to be inclined with respect to a surface of the object and incident on the surface.

The invention provides a prestress laser bending forming method for an aluminum alloy high-ribbed wallboard. The prestress laser bending forming method comprises the steps that S1, a plurality of to-be-formed areas are divided on the breadth of the aluminum alloy high-ribbed wallboard; S2, any to-be-formed area is selected to be subjected to pre-bending loading, so that the to-be-formed area enters slight plasticity; S3, a laser beam is used for scanning ribs with concentrated elastic stress in the to-be-formed area; S4, after the aluminum alloy high-ribbed wallboard is cooled to the room temperature, unloading is conducted, and forming of the to-be-formed area subjected to pre-bending loading is completed; and S5, the step S2, the step S3 and the step S4 are repeated in sequence for the rest to-be-formed areas, and an aluminum alloy high-ribbed wallboard bending forming piece is obtained. The pre-bending loading is carried out on the to-be-formed areas, so that the to-be-formed areas enter slight plasticity, and then the laser beam is used for scanning the rib parts with concentrated elastic stress, so that the bending forming of the aluminum alloy high-ribbed wallboard is realized, the overload damage and damage of the high-ribbed wallboard are avoided, and the forming precision of the high-ribbed wallboard is improved.