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CN-115070214-B - Laser impact curved surface imprinting micro-texture positioning method and automatic film changing device

CN115070214BCN 115070214 BCN115070214 BCN 115070214BCN-115070214-B

Abstract

The invention relates to the technical field of laser impact imprinting, in particular to a laser impact curved surface imprinting micro-texture positioning method and an automatic film changing device. The invention adopts the integrated contact film, carries out micro-texture nanosecond etching with the same size and structure and the same position on the adjacent contact films, and can carry out repeated imprinting of the micro-texture by conveying the contact film to the same position through the rubber conveying belt on the roller, or adjusts the X-Y axis positioning system to carry out variable-surface imprinting, thereby avoiding the phenomena of uneven imprinting, insufficient imprinting and the like caused by deformation of the contact film, reducing errors of misplacement imprinting and the like caused by vibration of the film in the imprinting process, ensuring the accuracy of repeated imprinting, and reducing the technological process.

Inventors

  • DAI FENGZE
  • WU LEI

Assignees

  • 江苏大学

Dates

Publication Date
20260512
Application Date
20220729

Claims (6)

  1. 1. A laser impact curved surface embossing automatic film changing device is characterized by comprising rollers, couplers, sliding blocks, upper and lower groups of rollers, a ball screw, a roller rotating servo motor, a guide rail, a rotating shaft, a supporting seat, an X-Y axis positioning system and a positioning baffle plate, wherein the X-Y axis positioning system is arranged on a horizontal workbench and positioned below micro-texture contact films clamped between the rollers, eight rollers form four roller groups, the rollers are connected with the roller rotating servo motor through connecting rods and the couplers, the rear ends of the rollers are fixedly provided with positioning baffles with bearings, the rotating servo motor connected with the rollers has the same rotating speed, the upper and lower groups of rollers are fixed together through elastic rubber transmission belts to realize stable rotation, the roller rotating servo motor is fixed on the sliding blocks, the sliding blocks are mounted on the ball screw, the sliding blocks are loaded with a sliding block up and down displacement servo motor for controlling the upper and down displacement of the sliding blocks on the ball screw, the distance between the sliding blocks on the ball screw is adjusted to adapt to the thickness of the required laser impact contact films, the distance between the upper and lower sliding blocks is adjusted to be in contact with the roller groups of rollers, the distance between the sliding blocks is adjusted to be matched with the rotating shafts, the rotating shafts are rotatably fixed on the guide rails through the rotating shafts, the rotating shafts are rotatably arranged on the guide rails and the guide rails are in a matched mode, and can be connected with the rotating shafts on the rotating shafts to realize a fixed guide rail through the rotating shafts, and can be matched with the rotating shafts, and can rotate, at the positions of a position of a rotary guide rail is convenient device is matched with a position, and can rotate on a position has a position sensor is matched with a position to rotate. The quick film changing can be realized by adjusting the speed of the roller rotating servo motor.
  2. 2. The automatic film changing device for laser impact curved surface embossing according to claim 1, wherein the device is fixed on a horizontal workbench through bolts on a supporting seat.
  3. 3. The automatic film changing device for laser impact curved surface embossing according to claim 1, wherein when the workpiece is bigger, the corresponding contact film is bigger, the relative distance between the supporting seats is required to be enlarged, and the length of the rubber transmission belt and the number of rollers are increased, so that the stability of the transmission and impact process is ensured.
  4. 4. The positioning method for implementing laser impact curved surface imprinting micro-texture by using the device as claimed in claim 1, wherein the micro-texture contact film is an integrated contact film, the integrated contact film is composed of a plurality of impact areas and buffer areas, the buffer areas are arranged between two adjacent impact areas, guide grooves are arranged in the buffer areas, and micro-textures with the same size and structure are etched on the same positions of the adjacent impact areas by using a nanosecond laser; the method comprises the steps of carrying out laser impact embossing on a contact film at a previous station, restoring the position of a ball head on a guide rail to an initial state, resetting a rotating shaft, transmitting a new contact film to the position above the position where the sample needs to be embossed through a roller and an elastic rubber transmission belt, sequentially adjusting the positions of the rotating shaft and the ball head on the guide rail to the position where the sample needs to be embossed, fixing a positioning baffle with a bearing behind the roller, ensuring that the contact film cannot displace in the curvature adjustment process, carrying out dislocation alignment embossing by utilizing the superposition of a guide groove and a front embossing texture when the micro-texture is repositioned, wherein the guide groove is a penetrating structure of the contact film, processing the guide groove and the micro-texture together, carrying out the micro-texture offset correction and the micro-texture embossing at different positions through adjusting an X-Y axis positioning system, adapting to repositioning of the texture after the curved surface change, and carrying out the micro-texture downward movement on the ball screw so that the new contact film is tightly attached to the surface of the sample, and thus the automatic positioning of the micro-texture after the micro-texture is replaced in continuous laser impact reinforcement can be achieved.
  5. 5. The method of claim 4, wherein the nanosecond laser spot used to ablate the surface microtexture has a diameter of 50 μm, a pulse width of 200ns, a velocity of 200mm/s, a power of 600W, and a frequency of 200kHz.
  6. 6. The method of claim 4, wherein the integrated contact film is made of 60Si2CrVA high-elasticity spring steel, and is subjected to polishing and ultrasonic cleaning after micro-texture is etched by nanosecond laser.

Description

Laser impact curved surface imprinting micro-texture positioning method and automatic film changing device Technical Field The invention relates to the technical field of laser impact imprinting, in particular to a laser impact curved surface imprinting micro-texture positioning method and an automatic film changing device. Background The laser impact stamping technology is used as a novel surface texture preparation technology, has the functions of surface plasticity strengthening and surface morphology control, remarkably improves the high-cycle fatigue performance of the metal through residual compressive stress prefabrication and microstructure improvement, and simultaneously controls the uncontrollable morphology of the surface. However, the high power density laser impact easily causes the micro-texture contact film to generate larger plastic deformation, and the low power density laser impact can cause uneven and insufficient embossing of the surface morphology, so that the micro-texture contact film needs to be continuously replaced, which not only causes the process flow of the laser impact embossing to become complicated, but also brings new problems, namely, after the contact film is replaced, the micro-texture is automatically positioned and the embossed texture is consistent, and besides, the positioning, the adjustment and the replacement of the contact film are very difficult for the workpiece with curvature. Disclosure of Invention Aiming at the problems, the invention aims to provide an automatic film changing device and a micro-texture positioning method, which are used for solving the problems of complex process flow, accurate micro-texture positioning and the like caused by changing a curved contact film in the laser impact curved imprinting process. In order to solve the problems, the invention provides the following technical scheme: The device is characterized by comprising a micro-texture contact film, rollers, a coupler, a sliding block, a blocking block, a sliding block up-down displacement servo motor, a ball screw, a roller rotating servo motor, a guide rail, a rotating shaft, a supporting seat, an X-Y axis positioning system and a positioning baffle. The device is fixed on the horizontal workbench through bolts on the supporting seat. The X-Y axis positioning system is also placed on a horizontal table below the microtextured contact film held between the rollers. The device is characterized by comprising four roller groups and eight rollers, wherein the eight rollers are connected with a roller rotating servo motor through a connecting rod and a coupler, the rear ends of the rollers are fixedly provided with positioning baffles with bearings, the rotating speeds of the rotating servo motors connected with the rollers are the same, the upper roller group and the lower roller group are fixed together through elastic rubber conveying belts to realize stable rotation, the roller rotating servo motor is fixed on a sliding block, the sliding block is arranged on the ball screw, the sliding block is provided with a sliding block up-down displacement servo motor for controlling the up-down displacement of the sliding block on the ball screw, the distance between the sliding blocks on the ball screw is adjusted to adapt to the thickness of a required laser impact stamping contact film, after the distance between the sliding blocks on the same screw is adjusted to adapt to the thickness of the contact film, the distance between the two sliding blocks on each ball screw is unchanged, the corresponding sliding blocks on each ball screw is the same, the ball screw is connected with the connecting rod, the tail end ball heads of the connecting rod are fixed on a guide rail through fixing pins, the guide rail is marked with degrees to facilitate curvature adjustment, the guide rail is connected with a rotating shaft, the rotating shaft is fixed on a supporting seat, the rotating shaft is used for realizing automatic rotation and a function of the rotating shaft and can reset, and the rotating speed of the rotating servo motor can be controlled to realize the rotation speed adjustment through the rotating shaft. Before the device is used for implementing laser impact curved surface imprinting, the position of a micro-texture is required to be preset to achieve the purpose of positioning, namely, an integrated contact film is adopted, as shown in fig. 3, the integrated contact film is composed of a plurality of impact areas and buffer areas, the buffer areas are arranged between the two adjacent impact areas, guide grooves are arranged in the buffer areas, micro-textures with the same size and structure are etched on the same positions of the adjacent impact areas by utilizing nanosecond lasers, after the laser impact imprinting of the contact film at the previous station, the position of the ball head on a guide rail is restored to an initial state, the rotating shaft is reset, then the roller