Grid printing method and marking machine

Abstract

The invention discloses a grid printing method and a marking machine. The method comprises the steps that a marking machine outputs a positive electrode to a marking head through a first wiring terminal and outputs a negative electrode through a second wiring terminal within a first time period, under the condition that the positive electrode is output through the first wiring terminal, the marking head serves as a cathode, a workpiece to be printed serves as an anode, metal electric ions move to the marking head serving as the cathode and are oxidized, and the marking head serves as the cathode; generating metal oxide ions; the marking machine outputs a negative electrode to the marking head through the first wiring terminal and outputs a positive electrode through the second wiring terminal within the second time period, under the condition that the negative electrode is output through the first wiring terminal, the marking head serves as an anode, the to-be-printed workpiece serves as a cathode, metal oxidation ions move to the to-be-printed workpiece serving as the anode, and the to-be-printed workpiece serves as the cathode; and curing on the surface of the workpiece to be printed. The technical problem that in the existing grid printing process, pits or scratches are left on the surface of a plate, and therefore the surface roughness of the plate is changed is solved.

Description

Technical Field

[0001] The invention relates to the field of measurement, and in particular to a grid printing method and a marking machine. Background Art

[0002] The grid strain measurement and analysis of sheet metal forming is based on industrial close-range photogrammetry. The position of each dot in multiple photos is calculated with high precision, and then the spatial coordinates of each dot are calculated based on the data of photos from different angles using the photogrammetry method. Through these dot arrays, the deformed shape of the part can be defined. By calculating the distance change between the dots, the deformation and strain of the part can be obtained. Using the above data, the strain distribution of the part, the hot spot area and the thickness change of the plate (assuming the volume remains unchanged) can be calculated.

[0003] At present, in the grid strain measurement and analysis experiment, the printing methods used for the grid points on the experimental plate include electrochemical corrosion (etching), printing, and scratching. However, the above methods will leave pits or scratches on the surface of the plate during the grid printing process, thereby changing the surface roughness of the plate. In the later stamping process, these pits or scratches will affect the flow of the material to a certain extent, and then cause the deformation of the plate during the experiment to be different from the deformation during normal stamping, affecting the accuracy and results of the experiment.

[0004] Currently, no effective solution has been proposed to solve the problem that pits or scratches are left on the surface of the plate during the above-mentioned existing grid printing process, thereby changing the surface roughness of the plate. Summary of the invention

[0005] The embodiments of the present invention provide a grid printing method and a marking machine to at least solve the technical problem that pits or scratches are left on the surface of a plate during the existing grid printing process, thereby changing the surface roughness of the plate.

[0006] According to one aspect of an embodiment of the present invention, a grid printing method is provided, comprising: enabling a marking machine to output a positive electrode to a marking head through a first wiring terminal in a first time period, and output a negative electrode through a second wiring terminal, wherein the marking head contacts a workpiece to be printed after being soaked in a marking liquid, and the workpiece to be printed is connected to the second wiring terminal of the marking machine, the marking liquid is an electrolyte, and is used to electrolyze metal ions on the surface of the workpiece to be printed, and in the case where the first wiring terminal outputs a positive electrode, the marking head serves as a cathode, and the workpiece to be printed serves as an anode, and the metal ions move toward the marking head serving as a cathode and are oxidized to generate metal oxide ions; enabling the marking machine to output a negative electrode to the marking head through the first wiring terminal in a second time period, and output a positive electrode through the second wiring terminal, wherein the second time period is connected to the first time period, and the first time period and the second time period have the same time length, and in the case where the first wiring terminal outputs a negative electrode, the marking head serves as an anode, and the workpiece to be printed serves as a cathode, and the metal oxide ions move toward the workpiece to be printed serving as an anode, and are solidified on the surface of the workpiece to be printed.

[0007] Optionally, the method further includes: bringing the marking head into contact with the surface of the workpiece to be printed via a grid plate, wherein the first surface of the grid plate contacts the marking head, and the second surface of the grid plate contacts the surface of the workpiece to be printed, the first surface and the second surface are parallel surfaces with the largest area of ​​the grid plate, and there are multiple through holes between the first surface and the second surface of the grid plate, and the multiple through holes are arranged at equal intervals on the grid plate.

[0008] Optionally, the method further comprises: bringing a marking terminal in the marking head into contact with the surface of the workpiece to be printed through the through hole in the grid plate, wherein the marking head comprises: a plurality of the marking terminals.

[0009] Optionally, the method further comprises: allowing the marking liquid soaked in the marking head to contact the surface of the workpiece to be printed through the through holes in the grid plate.

[0010] Optionally, the method further includes: providing an AC power supply to the marking machine, wherein the AC power supply is used to provide the marking machine with AC power whose current direction changes according to a preset cycle; and enabling the marking machine to determine the length of the first time period and the second time period according to the length of the preset cycle.

[0011] Optionally, the method also includes: identifying a marking symbol generated by the metal oxide ions on the surface of the workpiece to be printed; detecting the marking quality of the marking symbol, wherein the marking quality is at least used to indicate: whether the boundary of the marking symbol is clear, and whether the coverage area of ​​the marking symbol on the surface of the workpiece to be printed meets the preset area standard; if the marking quality meets the preset quality requirements, determining the workpiece to be printed as a printed workpiece to be inspected, wherein if the boundary of the marking symbol is clear and the coverage area of ​​the marking symbol meets the preset area standard, determining that the marking quality meets the preset quality requirements.

[0012] Optionally, the method further includes: using a camera to capture a workpiece image of the workpiece to be inspected at a preset position, wherein the preset position is a relative position of the camera and the workpiece to be inspected, and in the workpiece image, the workpiece to be inspected is located in the middle of the image, and the marking symbol on the surface of the workpiece to be inspected is clear.

[0013] Optionally, using a camera to collect a workpiece image of the workpiece to be inspected at a preset position includes: adjusting the aperture of the camera to a first aperture value, and adjusting the focal ring of the camera at the preset position to obtain a preset focal length value that makes the marking symbol clear, wherein the aperture is used to adjust the open area of ​​the camera lens, and the focal ring is used to adjust the imaging distance of the camera lens; and allowing the camera to collect the workpiece image of the workpiece to be inspected at the preset position according to the preset focal length value and the second aperture value.

[0014] Optionally, using a camera to collect a workpiece image of the workpiece to be inspected at a preset position includes: using the camera to collect a workpiece image of the workpiece to be inspected at a first preset position, wherein, at the first preset position, the imaging optical axis of the camera is perpendicular to the surface of the workpiece to be inspected; using the camera to collect a workpiece image of the workpiece to be inspected at a second preset position, wherein, at the second preset position, the imaging optical axis of the camera is at a preset angle to the surface of the workpiece to be inspected.

[0015] According to one aspect of an embodiment of the present invention, a marking machine is provided, comprising: a first terminal connected to a marking head, and used to output a positive electrode to the marking head in a first time period, and to output a negative electrode to the marking head in a second time period; a second terminal connected to a workpiece to be printed, and used to output a negative electrode to the workpiece to be printed in the first time period, and to output a positive electrode to the workpiece to be printed in the second time period; wherein the second time period is connected to the first time period, and the first time period and the second time period have the same time length, the marking head contacts the workpiece to be printed after being soaked in a marking liquid, the marking liquid is an electrolyte, and is used to electrolyze metal ions on the surface of the workpiece to be printed, when the first terminal outputs a positive electrode, the marking head serves as a cathode, and the workpiece to be printed serves as an anode, and the metal ions move toward the marking head serving as a cathode and are oxidized to generate metal oxide ions, and when the first terminal outputs a negative electrode, the marking head serves as an anode, and the workpiece to be printed serves as a cathode, and the metal oxide ions move toward the workpiece to be printed serving as an anode, and are solidified on the surface of the workpiece to be printed.

[0016] In the embodiment of the present invention, the marking machine outputs a positive electrode to the marking head through the first terminal in the first time period, and outputs a negative electrode to the workpiece to be printed through the second terminal, and outputs a negative electrode to the marking head through the first terminal in the second time period, and outputs a positive electrode to the workpiece to be printed through the second terminal. Then, the marking head soaked in the marking liquid can contact the workpiece to be printed, so that the surface of the workpiece to be printed electrolyzes metal ions under the action of the marking liquid. Then, the metal ions can move to the marking head as a cathode in the first time period and be oxidized into metal oxide ions, and the oxidized metal ions can be oxidized into metal oxide ions. During the second time period, the metal oxide ions can move toward the workpiece to be printed, which serves as the cathode, and solidify on the surface of the workpiece to be printed to form a marking symbol, so that the metal ions electrolyzed on the surface of the workpiece to be printed return to the surface of the workpiece to be printed after oxidation, thereby avoiding the formation of depressions on the surface of the workpiece to be printed, thereby achieving the purpose of avoiding depressions on the surface of the plate during the grid printing process, thereby achieving the technical effect of not changing the surface roughness of the plate during the grid printing process, and further solving the technical problem of leaving pits or scratches on the surface of the plate in the existing grid printing process, thereby changing the surface roughness of the plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1is a flow chart of a grid printing method according to an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of the front side of a marking machine according to an embodiment of the present invention;

[0020] Figure 3 is a schematic diagram of the back side of a marking machine according to an embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of a marking process according to an embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of a grid printing qualification determination according to an embodiment of the present invention;

[0023] Figure 6 is a schematic diagram of related materials of a photographing device according to an embodiment of the present invention;

[0024] Figure 7 is a schematic diagram of a photographing angle according to an embodiment of the present invention;

[0025] Figure 8 is a schematic diagram of a surface component for creating a point grid according to an embodiment of the present invention;

[0026] Fig. 9 is a schematic diagram of full-field detection according to an embodiment of the present invention;

[0027] Fig.10 is a schematic diagram of a report according to an embodiment of the present invention;

[0028] Fig.11 is a schematic diagram of a marking machine according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] According to an embodiment of the present invention, a method embodiment of grid printing is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0032] Figure 1 is a flow chart of a grid printing method according to an embodiment of the present invention. Figure 1 As shown, the method comprises the following steps:

[0033] Step S102, enabling the marking machine to output a positive electrode to the marking head through the first terminal and output a negative electrode through the second terminal within a first time period, wherein the marking head contacts the workpiece to be printed after being soaked in the marking liquid, and the workpiece to be printed is connected to the second terminal of the marking machine, the marking liquid is an electrolyte, and is used to electrolyze metal ions on the surface of the workpiece to be printed. When the first terminal outputs a positive electrode, the marking head serves as a cathode, and the workpiece to be printed serves as an anode, and the metal ions move toward the marking head serving as a cathode and are oxidized to generate metal oxide ions;

[0034] Step S104, enables the marking machine to output a negative electrode to the marking head through the first terminal in the second time period, and output a positive electrode through the second terminal, wherein the second time period is connected to the first time period, and the first time period and the second time period have the same time length. When the first terminal outputs a negative electrode, the marking head serves as an anode and the workpiece to be printed serves as a cathode, and the metal oxide ions move toward the workpiece to be printed serving as the anode and solidify on the surface of the workpiece to be printed.

[0035] In the embodiment of the present invention, the marking machine outputs a positive electrode to the marking head through the first terminal in the first time period, and outputs a negative electrode to the workpiece to be printed through the second terminal, and outputs a negative electrode to the marking head through the first terminal in the second time period, and outputs a positive electrode to the workpiece to be printed through the second terminal. Then, the marking head soaked in the marking liquid can contact the workpiece to be printed, so that the surface of the workpiece to be printed electrolyzes metal ions under the action of the marking liquid. Then, the metal ions can move to the marking head as a cathode in the first time period and be oxidized into metal oxide ions, and the oxidized metal ions can be oxidized into metal oxide ions. During the second time period, the metal oxide ions can move toward the workpiece to be printed, which serves as the cathode, and solidify on the surface of the workpiece to be printed to form a marking symbol, so that the metal ions electrolyzed on the surface of the workpiece to be printed return to the surface of the workpiece to be printed after oxidation, thereby avoiding the formation of depressions on the surface of the workpiece to be printed, thereby achieving the purpose of avoiding depressions on the surface of the plate during the grid printing process, thereby achieving the technical effect of not changing the surface roughness of the plate during the grid printing process, and further solving the technical problem of leaving pits or scratches on the surface of the plate in the existing grid printing process, thereby changing the surface roughness of the plate.

[0036] Optionally, the workpiece to be printed may be an aluminum metal part, such as an aluminum alloy.

[0037] Optionally, the marking liquid, ie, the electrolyte, may be a metal etching liquid, such as "8090 etching liquid" for aluminum-lithium alloys.

[0038] Optionally, the marking machine mainly includes: a power supply, a control unit, a needle pen electrode (such as a marking head), a surface electrode (such as a substrate carrying a workpiece to be printed, and the workpiece to be printed can be used as a common electrode with the substrate if the workpiece to be printed contacts the substrate) and a water tank. The power supply provides electrical energy, and the control unit is responsible for the control and regulation of the current. When working, a layer of conductive electrolyte is first applied to the metal surface, and then the current is transmitted to the metal surface through the needle pen electrode.

[0039] It should be noted that, in the existing marking machines, an electrolytic reaction will occur on the metal surface under the action of electric current, and the metal ions will detach from the surface to form blank parts. These blank parts gradually form patterns as the reaction proceeds, thereby leaving a permanent mark on the metal surface, thereby leaving pits or scratches on the metal surface; the marking machine provided in the present application switches the electrodes between the first time period and the second time period, so that the metal ions electrolyzed on the metal surface will oxidize after detaching from the surface, and return to their original positions again when oxidized to metal oxide ions, thereby generating a printed marking symbol, thereby not leaving pits or scratches on the metal surface.

[0040] As an optional embodiment, the method also includes: contacting the marking head with the surface of the workpiece to be printed through the grid plate, wherein the first surface of the grid plate contacts the marking head, and the second surface of the grid plate contacts the surface of the workpiece to be printed, the first surface and the second surface are parallel surfaces with the largest area of ​​the grid plate, and there are multiple through holes between the first surface and the second surface of the grid plate, and the multiple through holes are arranged at equal intervals on the grid plate.

[0041] In the above embodiment of the present application, the marking head is brought into contact with the surface of the workpiece to be printed via the grid plate, and the marking head and the workpiece to be printed can print marking symbols through the through holes on the grid plate.

[0042] Optionally, the shape of the marking symbol is the same as the shape of the through hole of the grid plate.

[0043] As an optional embodiment, the method further includes: contacting a marking terminal in the marking head with the surface of the workpiece to be printed through a through hole in the grid plate, wherein the marking head includes: a plurality of marking terminals.

[0044] In the above-mentioned embodiment of the present application, the marking terminal in the marking head can pass through the through hole in the grid plate, so the marking terminal in the marking head passing through the through hole can contact the surface of the workpiece to be printed and print the marking symbol formed by metal oxide ions.

[0045] Optionally, the marking terminal may be a needle-shaped terminal, one side of the needle tip being in contact with the surface of the workpiece to be printed.

[0046] As an optional embodiment, the method further includes: allowing the marking liquid soaked in the marking head to contact the surface of the workpiece to be printed through the through holes in the grid plate.

[0047] In the above-mentioned embodiment of the present application, the marking liquid soaked in the marking head can pass through the through hole in the grid plate, so that the marking head contacts the workpiece to be printed through the marking liquid, and then the metal ions electrolyzed by the workpiece to be printed and the metal oxide ions partially oxidized by the marking head can move through the marking liquid, so that a marking symbol formed by the metal oxide ions can be printed on the surface of the workpiece to be printed.

[0048] As an optional embodiment, the method also includes: providing an AC power supply to the marking machine, wherein the AC power supply is used to provide the marking machine with AC power whose current direction changes according to a preset period; and enabling the marking machine to determine the length of the first time period and the second time period according to the length of the preset period.

[0049] In the above embodiment of the present application, the marking machine uses an AC power supply. Since the AC power itself has the characteristic of periodic change in current direction, the length of the first time period and the second time period can be set according to the preset period of the AC power supply changing the current direction, that is, the first terminal and the second terminal of the marking machine can change the polarity according to the preset period of the AC power supply changing the current direction, so that the marking head can perform cathode / anode conversion according to the preset period.

[0050] Optionally, the AC power supply can provide a sinusoidal AC voltage with an amplitude of + / -25V, and the operating frequency is the same as the input voltage frequency. The universal input frequency is 50Hz, that is, the duration of each working cycle (such as a preset cycle) is 20ms.

[0051] Optionally, the surface of the workpiece to be printed may have multiple marking symbols formed by metal oxide ions.

[0052] Optionally, the marking head may be used to perform multiple printings on the surface of the workpiece to be printed.

[0053] As an optional embodiment, the method also includes: identifying a marking symbol generated by metal oxide ions on the surface of the workpiece to be printed; detecting the marking quality of the marking symbol, wherein the marking quality is at least used to indicate: whether the boundary of the marking symbol is clear, and whether the coverage area of ​​the marking symbol on the surface of the workpiece to be printed meets the preset area standard; when the marking quality meets the preset quality requirements, determining the workpiece to be printed as a printed workpiece to be inspected, wherein when the boundary of the marking symbol is clear and the coverage area of ​​the marking symbol meets the preset area standard, determining that the marking quality meets the preset quality requirements.

[0054] In the above-mentioned embodiment of the present application, after the marking symbol is printed on the workpiece to be printed, the marking quality of the printed mark can be detected. If the marking quality meets the preset quality requirements, the workpiece to be printed is further tested as a workpiece to be inspected; if the marking quality does not meet the preset quality requirements, the workpiece to be printed can be printed again until the marking quality of the marking symbol on the workpiece to be printed does not meet the preset quality requirements.

[0055] Optionally, when the coverage area of ​​the workpiece to be printed by the multiple marking symbols formed by the metal oxide ions reaches more than 90%, it can be determined that the coverage area reaches the preset area standard.

[0056] As an optional embodiment, the method also includes: using a camera to capture a workpiece image of the workpiece to be inspected at a preset position, wherein the preset position is the relative position of the camera and the workpiece to be inspected, and in the workpiece image, the workpiece to be inspected is located in the middle of the image, and the marking symbols on the surface of the workpiece to be inspected are clear.

[0057] In the above embodiment of the present application, the workpiece to be inspected with the marking symbol printed thereon can be captured by a camera for subsequent analysis, and then when capturing the workpiece image of the workpiece to be inspected, the camera can be captured at a preset position.

[0058] Optionally, there may be multiple preset positions and multiple workpiece images may be collected.

[0059] As an optional embodiment, using a camera to collect a workpiece image of the workpiece to be inspected at a preset position includes: adjusting the aperture of the camera to a first aperture value, and adjusting the focal ring of the camera at the preset position to obtain a preset focal length value that makes the marking symbol clear, wherein the aperture is used to adjust the open area of ​​the camera lens, and the focal ring is used to adjust the imaging distance of the camera lens; and the camera collects the workpiece image of the workpiece to be inspected at the preset position according to the preset focal length value and the second aperture value.

[0060] In the above-mentioned embodiment of the present application, when using a camera to collect workpiece images, it is necessary to adjust the camera parameters of the camera for each preset position to obtain a workpiece image that meets the usage requirements, and each time the camera parameters are adjusted, it is necessary to first adjust the aperture of the camera to a first aperture value, and then maintain the aperture at the first aperture value, adjust the focal ring of the camera to obtain a preset focal length value that makes the marking symbol clear, and finally maintain the focal ring at the preset focal length value, and adjust the aperture from the first aperture value to the second aperture value, and then at each preset position, the camera can collect the workpiece image of the workpiece to be inspected according to the preset focal length value and the second aperture value adjusted at the preset position.

[0061] Optionally, the first aperture value may be F2.8, and the second aperture value may be F11.

[0062] As an optional embodiment, using a camera to collect a workpiece image of the workpiece to be inspected at a preset position includes: using a camera to collect a workpiece image of the workpiece to be inspected at a first preset position, wherein, at the first preset position, the imaging optical axis of the camera is perpendicular to the surface of the workpiece to be inspected; using a camera to collect a workpiece image of the workpiece to be inspected at a second preset position, wherein, at the second preset position, the imaging optical axis of the camera is at a preset angle to the surface of the workpiece to be inspected.

[0063] In the above-mentioned embodiment of the present application, the camera collects multiple workpiece images of the workpiece to be inspected from multiple preset positions, wherein the collected workpiece images at least include: workpiece images collected directly above the workpiece to be inspected, and multiple workpiece images collected on the upper side of the workpiece to be inspected.

[0064] Optionally, the height difference between the preset position and the workpiece to be detected is a preset height threshold, and there may be multiple preset height thresholds, and each preset height threshold collects a preset number of workpiece images.

[0065] Optionally, the preset height threshold may be 3-5.

[0066] Optionally, the preset number may be 3-5 sheets.

[0067] The present invention also provides a preferred embodiment, which provides a method for printing grid points of a grid strain analysis experimental sample, wherein the grid is printed on a metal plate for the experiment by electrochemical corrosion, and no change is caused to the substrate, thereby ensuring that the deformation of the plate in the grid strain analysis experiment is closer to the stamping deformation of the actual part, which is beneficial to improving the accuracy of the grid strain analysis experiment, and subsequently using high-precision camera technology to image it, and then using the ZIESS system to process the data.

[0068] As an optional example, the grid printing process includes:

[0069] Step S1.1, wear gloves and prepare blanks, such as sheet materials for car doors, engine covers and other parts.

[0070] Step S1.2, placing the blank on a sheet rack or a workbench according to customer requirements.

[0071] Step S1.3, prepare a 220V power supply to power the marking machine.

[0072] Figure 2 is a schematic diagram of the front side of a marking machine according to an embodiment of the present invention, such as Figure 2 As shown, it at least includes: a main body of the marking machine, and a marking head.

[0073] Optionally, the marking power can be linearly adjusted between 5%-95%, and the set power value % represents the maximum transformer output power. In the "Pause" marking mode, the marking power output is 37-45%. Of course, the power will vary depending on the brand.

[0074] Step S1.4, turn off the power of the marking machine and connect the output wire of the marking machine.

[0075] Figure 3 is a schematic diagram of the back side of a marking machine according to an embodiment of the present invention, such as Figure 3 As shown, the marking machine includes multiple connection ports, among which the yellow line is the power supply line of the marking machine, which is connected to the connection terminal X5 of the marking machine; the red line is the connection line of the marking head, which is connected to the connection terminal X1 of the marking machine; the blue line is the substrate connection line, which is connected to the connection terminal X2 of the marking machine.

[0076] Optionally, a connection line between the marking machine and the substrate has a first end that is a terminal connected to the marking machine and a second end that is a clip that is clamped on the sheet material.

[0077] Step S1.5, prepare the grid plate, marking liquid (for aluminum alloy, 8090 etching liquid is generally selected), paper towels, alcohol, and perform equipment self-check.

[0078] Optionally, perform a visual inspection of the equipment including:

[0079] Check the connection and disconnection of the wiring plug X5 connected to the power supply on the back of the device.

[0080] Check whether the 220V power supply is connected or disconnected.

[0081] Check whether the power isolation switch is turned on and off.

[0082] Check whether the fuse (1xF630mA) needs to be replaced.

[0083] Check the connection and disconnection of the connection line from the marking head to the connection plug X1.

[0084] Detects the connection and disconnection of the connection line from the base board to the connection plug X2.

[0085] Detects the connection and disconnection of the multi-function input / output to the D-SUB socket connection line (such as X3).

[0086] Check the connection and disconnection of the connection line from the circulation pump to the connection plug X4.

[0087] Detection of creating and changing parameter files at the rotary switches.

[0088] Step S1.6, turn on the power of the marking machine, one person holds and presses the grid plate to prevent it from moving, and one person dips the marking head into the marking liquid and prints the grid on the plate through the grid plate, brushing 4 to 6 times in one direction. When printing the grid, press down evenly and keep the speed as consistent as possible to make the printed grid clear.

[0089] Optionally, the transformer can provide a sinusoidal AC voltage with an amplitude of + / -25V, and the operating frequency is the same as the input voltage frequency. The universal input frequency is 50Hz, that is, each working cycle lasts for 20ms.

[0090] Optionally, for formed parts made of aluminum alloy, micro-pulse control is generally used. Depending on the material and application scenario, this control method can provide additional positive effects.

[0091] Figure 4 is a schematic diagram of a marking process according to an embodiment of the present invention, such as Figure 4As shown, the marking head soaked in electrolyte is gently pressed on the marking template on the marking workpiece; when the marking work is powered on, the marking head and the workpiece are in contact, and the metal ions move from the anode to the cathode; under the action of the marking electrolyte, the metal ions of the marking workpiece move from the anode to the cathode, and a chemical reaction occurs on the surface of the metal workpiece: metal ion oxidation; the electrode of the marking head is flipped from cathode to anode, and the substrate changes from anode to cathode, and the metal ions oxidized by the marking electrolyte move in the opposite direction to the workpiece, while the oxidized metal ions return to the original position and solidify on the material surface of the workpiece.

[0092] Step S1.7, after printing the grid, absorb the excess marking liquid with a paper towel and protect the surface of the grid to prevent scratches.

[0093] Optionally, after the workpiece is marked, the work surface needs to be cleaned with a suitable neutralizing liquid (ether is best, ethanol is worse). The purpose of the neutralizing liquid is to passivate the marking content and remove the residual salt on the mark to avoid post-oxidation. The neutralizing liquid can be wiped off with a soft cloth.

[0094] Step S1.8, print the grid of the next area of ​​the sheet material according to the demand. Different parts require different numbers of printing areas. Usually, the door inner panel needs to be printed with 8 to 12 A3 grid areas, and the hood inner panel needs to be printed with 10 to 16 A3 grid areas.

[0095] Step S1.9, after the sheet grid is printed, the marking machine host and accessories need to be cleaned up. The marking head and grid plate need to be cleaned with running water to clean the marking liquid remaining on the marking head and grid plate. Place them in a ventilated place to dry before cleaning them up to prevent the marking liquid from corroding the marking head and grid plate and to increase the life of marking accessories and consumables.

[0096] Figure 5 is a schematic diagram of a grid printing qualification determination according to an embodiment of the present invention, such as Figure 5 As shown in the figure, after the grid is printed, the standard for qualified printing is: most areas (more than 90%) of the aluminum plate grid are displayed as evenly distributed white dots, with clear boundaries and no ghosting. Good grid quality is conducive to subsequent photo shooting and data calculation after stamping is completed.

[0097] As an optional example, a photo shoot after zero stamping forming, including:

[0098] Step S3.1, cleaning of mesh parts after stamping.

[0099] Optionally, the surface of parts after stamping is generally dirty. If you take photos directly to extract grid change data, the recognition rate will be reduced. Therefore, before taking photos, you need to wipe the parts clean with a paper towel or dust-free cloth dipped in alcohol to remove excess oil or debris on the surface of the grid area of ​​the parts to facilitate taking photos.

[0100] Step S3.2, prepare equipment.

[0101] Optionally, check whether the relevant materials of the photographic equipment are complete.

[0102] Figure 6 is a schematic diagram of related materials of a photographing device according to an embodiment of the present invention, such as Figure 6 As shown, the relevant materials include: 1 SLR camera, 1 set of white dot black background scale, 1 memory card, 1 Dell laptop and power cord, 1 GOM password dongle, 2 SLR camera lithium batteries, 8 No. 5 dry batteries for flash, and 1 cross screwdriver.

[0103] Optionally, check the power level of lithium batteries and dry batteries to ensure that the power level is above 80%.

[0104] Optionally, take a picture with your camera to check if the camera is working properly.

[0105] Step S3.3, taking a photo, specifically includes:

[0106] Step S3.3.1, adjust the camera focus.

[0107] Optionally, use a Phillips screwdriver to turn the camera's focus ring screw two turns counterclockwise so that the focus ring can rotate freely.

[0108] Optionally, rotate the camera aperture to F2.8.

[0109] Optionally, place 6 scales around the shooting area, hold the camera to the shooting working distance, rotate the focus ring to make the scale present a clear image, take a photo under this focus ring, press the zoom button on the camera interface to check whether the white dot of the scale in the photo is clear. If it is not clear, continue to adjust the focus ring. After adjusting the appropriate focus ring, use a cross screwdriver to rotate the focus ring screw clockwise to fix the focus ring.

[0110] Optionally, rotate the camera aperture to F11.

[0111] Step S3.3.2, confirm the quality of the taken photo.

[0112] Optionally, check the grid quality of the shooting area to see if it is clear, whether there is grid point overlap, grid point serious wear and tear, etc. Specifically include:

[0113] Take a photo perpendicular to the shooting area and press the zoom button on the camera interface to check whether the scale is clear.

[0114] Take a photo from the side of the shooting area and zoom in to check whether the grid points of the part are clear.

[0115] Step S3.3.3, take a photo.

[0116] Figure 7 is a schematic diagram of a photographing angle according to an embodiment of the present invention, such as Figure 7 As shown, first, take a photo perpendicular to the shooting area along the front, back, left and right directions respectively. Note that the scale in the photo should be clearly visible; select a certain angle around the shooting area to shoot sideways, take 5 photos at the same height but different angles, and select 3-5 heights to take photos. Take a total of 10-20 photos. During the shooting process, pay attention to check the photo quality. If the grid is not clear, delete the photo and readjust the angle to take the photo.

[0117] Optionally, during the photo-taking process, it is important to ensure that the parts and the scale remain stationary throughout the photo-taking process to avoid changes in the position of the scale. If changes occur, delete all previous photos and take new photos.

[0118] Step S3.3.4, find a good angle and distance, and adjust the flash parameters and angle appropriately to ensure a high contrast between the scale and grid white dots and black background in the photo.

[0119] Step S3.3.5: In the photo, the area occupied by the grid should be centered as much as possible, and the scale should be within a field of view as much as possible.

[0120] Step S3.3.6: The shooting environment should have little vibration to prevent the scale position from changing during shooting (due to the high precision of the equipment, a slight change in position will have a significant impact on the result), and the lighting should be appropriate to prevent over- or under-exposure.

[0121] Step S3.3.7, from the field of view, you can see a dot and a triangle in the lower left corner of the camera that keeps switching. When it becomes a dot, press the shutter button for the best photo effect.

[0122] Step S3.3.8: The number of photos taken varies from person to person and proficiency level, and it should be 15 to 40 photos. At least three clear photos should be taken to identify the same grid point, so that the ZIESS software can perform strain analysis and calculation on the grid.

[0123] As an optional example, data processing and reporting include:

[0124] Step S4.1, import photos and confirm whether they are valid.

[0125] Optionally, insert the notebook into the memory card and copy the photos; import the photos into the ZIESS software and check whether they are valid. If there is a problem that it cannot be recognized, you need to take photos again.

[0126] Step S4.2, performing ZIESS output processing, specifically including:

[0127] Step S4.2.1, start ZIESS. Install ZIESS inspect2023, start a new project, and set the scale and focal length in the file. Set the type and color in the reference point. The color is generally set to white dots and black background.

[0128] Step S4.2.2, add an image. Select Add an image from the hard disk, the image you just copied.

[0129] Step S4.2.3, define the ingredients.

[0130] Figure 8 is a schematic diagram of a surface component for creating a point grid according to an embodiment of the present invention, such as Figure 8 As shown, click the "surface component of point grid" control button in the ZIESS software, and the surface component of the point grid of the workpiece in the picture will be created.

[0131] Step S4.2.4, in the deformation detection, the actual elements that are visible are inspected.

[0132] Fig. 9 is a schematic diagram of a full-field detection according to an embodiment of the present invention, such as Fig. 9 As shown, the principal strain, secondary strain, wall thickness reduction, and distance to the forming limit are obtained respectively.

[0133] Step S4.2.5, generate a report.

[0134] Fig.10 is a schematic diagram of a report according to an embodiment of the present invention, such as Fig.10 As shown, the principal strain, secondary strain, wall thinning and FLC are generally selected.

[0135] Step S4.2.6, as Fig.10 In the example shown, the thinning rate of region 8 is too large, with a maximum thinning rate of 14%, which is not greater than the requirement of 16%; the FLD failure of region 10 is not greater than the requirement of -13%. Therefore, it is impossible for region 10 to be excessively thinned, so its forming limit is sufficient for this region.

[0136] Fig.11 is a schematic diagram of a marking machine according to an embodiment of the present invention, such as Fig.11 As shown, including:

[0137] A first terminal 1102, connected to the marking head 112, for outputting a positive electrode to the marking head in a first time period, and outputting a negative electrode to the marking head in a second time period;

[0138] The second terminal 1104 is connected to the workpiece 114 to be printed, and is used to output a negative electrode to the workpiece to be printed in a first time period, and to output a positive electrode to the workpiece to be printed in a second time period; wherein the second time period is connected to the first time period, and the first time period and the second time period have the same time length. The marking head contacts the workpiece to be printed after being soaked in the marking liquid. The marking liquid is an electrolyte, and is used to electrolyze metal ions on the surface of the workpiece to be printed. When the first terminal outputs a positive electrode, the marking head serves as a cathode, and the workpiece to be printed serves as an anode. The metal ions move toward the marking head serving as a cathode and are oxidized to generate metal oxide ions. When the first terminal outputs a negative electrode, the marking head serves as an anode, and the workpiece to be printed serves as a cathode. The metal oxide ions move toward the workpiece to be printed serving as an anode, and are solidified on the surface of the workpiece to be printed.

[0139] In the embodiment of the present invention, the marking machine outputs a positive electrode to the marking head through the first terminal in the first time period, and outputs a negative electrode to the workpiece to be printed through the second terminal, and outputs a negative electrode to the marking head through the first terminal in the second time period, and outputs a positive electrode to the workpiece to be printed through the second terminal. Then, the marking head soaked in the marking liquid can contact the workpiece to be printed, so that the surface of the workpiece to be printed electrolyzes metal ions under the action of the marking liquid. Then, the metal ions can move to the marking head as a cathode in the first time period and be oxidized into metal oxide ions, and the oxidized metal ions can be oxidized into metal oxide ions. During the second time period, the metal oxide ions can move toward the workpiece to be printed, which serves as the cathode, and solidify on the surface of the workpiece to be printed to form a marking symbol, so that the metal ions electrolyzed on the surface of the workpiece to be printed return to the surface of the workpiece to be printed after oxidation, thereby avoiding the formation of depressions on the surface of the workpiece to be printed, thereby achieving the purpose of avoiding depressions on the surface of the plate during the grid printing process, thereby achieving the technical effect of not changing the surface roughness of the plate during the grid printing process, and further solving the technical problem of leaving pits or scratches on the surface of the plate in the existing grid printing process, thereby changing the surface roughness of the plate.

[0140] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0141] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0142] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0143] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0144] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0145] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a non-volatile storage medium, including several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned non-volatile storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0146] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A grid printing method, characterized in that: include: The marking machine outputs a positive electrode to the marking head through the first terminal and outputs a negative electrode through the second terminal in a first time period, wherein the marking head contacts the workpiece to be printed after being soaked in the marking liquid, and the workpiece to be printed is connected to the second terminal of the marking machine, and the marking liquid is an electrolyte used to electrolyze metal ions on the surface of the workpiece to be printed. When the first terminal outputs a positive electrode, the marking head serves as a cathode and the workpiece to be printed serves as an anode, and the metal ions move toward the marking head serving as a cathode and are oxidized to generate metal oxide ions; The marking machine outputs a negative electrode to the marking head through the first terminal in a second time period, and outputs a positive electrode through the second terminal, wherein the second time period is connected to the first time period, and the first time period and the second time period have the same length. When the first terminal outputs a negative electrode, the marking head serves as an anode and the workpiece to be printed serves as a cathode. The metal oxide ions move toward the workpiece to be printed serving as the anode and are solidified on the surface of the workpiece to be printed.

2. The method according to claim 1, characterized in that: The method further comprises: The marking head is brought into contact with the surface of the workpiece to be printed via a grid plate, wherein the first surface of the grid plate is in contact with the marking head, and the second surface of the grid plate is in contact with the surface of the workpiece to be printed, the first surface and the second surface are parallel surfaces with the largest area of ​​the grid plate, and there are multiple through holes between the first surface and the second surface of the grid plate, and the multiple through holes are arranged at equal intervals on the grid plate.

3. The method according to claim 2, characterized in that The method further comprises: The marking terminal in the marking head is brought into contact with the surface of the workpiece to be printed through the through hole in the grid plate, wherein the marking head comprises: a plurality of the marking terminals.

4. The method according to claim 2, characterized in that: The method further comprises: The marking liquid soaked in the marking head is brought into contact with the surface of the workpiece to be printed through the through holes in the grid plate.

5. The method according to claim 1, characterized in that The method further comprises: Providing an AC power supply to the marking machine, wherein the AC power supply is used to provide the marking machine with AC power whose current direction changes according to a preset period; The marking machine is enabled to determine the length of the first time period and the second time period according to the length of the preset cycle.

6. The method according to claim 1, characterized in that The method further comprises: On the surface of the workpiece to be printed, identifying a marking symbol generated by the metal oxide ions; Detecting the marking quality of the marking symbol, wherein the marking quality is at least used to indicate whether the boundary of the marking symbol is clear and whether the coverage area of ​​the marking symbol on the surface of the workpiece to be printed meets a preset area standard; When the marking quality meets the preset quality requirements, the workpiece to be printed is determined to be a printed workpiece to be inspected, wherein when the boundary of the marking symbol is clear and the coverage area of ​​the marking symbol reaches the preset area standard, it is determined that the marking quality meets the preset quality requirements.

7. The method according to claim 6, characterized in that The method further comprises: A camera is used to collect a workpiece image of the workpiece to be inspected at a preset position, wherein the preset position is the relative position of the camera and the workpiece to be inspected, in the workpiece image, the workpiece to be inspected is located in the middle of the image, and the marking symbol on the surface of the workpiece to be inspected is clear.

8. The method according to claim 7, characterized in that Using a camera to collect a workpiece image of the workpiece to be inspected at a preset position includes: The aperture of the camera is adjusted to a first aperture value, and the focal ring of the camera at the preset position is adjusted to obtain a preset focal length value that makes the marking symbol clear, wherein the aperture is used to adjust the open area of ​​the lens of the camera, and the focal ring is used to adjust the imaging distance of the lens of the camera; The camera is enabled to collect a workpiece image of the workpiece to be inspected at the preset position according to the preset focal length value and the second aperture value.

9. The method according to claim 7, characterized in that: Using a camera to collect a workpiece image of the workpiece to be inspected at a preset position includes: Using the camera to collect a workpiece image of the workpiece to be inspected at a first preset position, wherein at the first preset position, the imaging optical axis of the camera is perpendicular to the surface of the workpiece to be inspected; The camera is used to collect a workpiece image of the workpiece to be inspected at a second preset position, wherein at the second preset position, the imaging optical axis of the camera and the surface of the workpiece to be inspected are at a preset angle.

10. A marking machine, characterized in that: include: A first wiring terminal, connected to the marking head, for outputting a positive electrode to the marking head in a first time period, and outputting a negative electrode to the marking head in a second time period; A second connection terminal is connected to the workpiece to be printed, and is used to output a negative electrode to the workpiece to be printed in the first time period, and output a positive electrode to the workpiece to be printed in the second time period; The second time period is connected to the first time period, and the first time period is the same as the second time period in length. The marking head contacts the workpiece to be printed after being soaked in the marking liquid. The marking liquid is an electrolyte used to electrolyze metal ions on the surface of the workpiece to be printed. When the first terminal outputs a positive electrode, the marking head serves as a cathode and the workpiece to be printed serves as an anode. The metal ions move toward the marking head serving as a cathode and are oxidized to generate metal oxide ions. When the first terminal outputs a negative electrode, the marking head serves as an anode and the workpiece to be printed serves as a cathode. The metal oxide ions move toward the workpiece to be printed serving as an anode and are solidified on the surface of the workpiece to be printed.

Images