Method for inhibiting stray corrosion in guide groove in outer surface of anesthesia puncture needle

Abstract

The invention relates to a method for inhibiting stray corrosion in a guide groove on the outer surface of an anesthesia puncture needle, which comprises the following steps: constructing a multi-physics field coupling model which comprises an anesthesia puncture needle and a cathode group electrode cutter; according to the multi-physics field coupling model, multi-physics field analysis is conducted, and initial electrochemical machining parameters are determined; and based on the initial electrolytic machining parameters, electrolytic machining is conducted on the anesthesia puncture needle, and the anesthesia puncture needle outer surface guide groove is formed. The method has the beneficial effects that the electrochemical machining parameters are accurately controlled through the multi-physical field coupling simulation model, electrolyte flowing and current distribution in the machining gap are optimized, and corrosion of stray current to the side wall of the guide groove is effectively restrained.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrochemical machining, and particularly relates to a method for suppressing stray corrosion in the guiding grooves on the outer surface of an anesthetic puncture needle. Background Art

[0002] The guiding grooves on the outer surface of a medical anesthetic puncture needle, as a multi-functional tool, are used to achieve precise operation and control of various substances. The processing methods for the guiding grooves on the outer surface of an anesthetic puncture needle mainly include numerical control milling, electrical discharge machining, laser machining. Compared with other processing methods, electrochemical machining has the characteristics of no tool loss, no recast layer, and no thermal stress, and has unique advantages in the processing of guiding groove structures.

[0003] However, during the electrochemical machining process, the stray current formed by the electric field in the gap causes stray corrosion on the side walls of the guiding grooves, reducing the machining accuracy; as the machining depth of the guiding grooves increases, the flow field conditions in the gap deteriorate, and the electrolytic products are difficult to discharge in time, resulting in poor uniformity of the electrolyte conductivity distribution, which restricts the improvement of the machining consistency of the guiding grooves. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for suppressing stray corrosion in the guiding grooves on the outer surface of an anesthetic puncture needle.

[0005] In a first aspect, a method for suppressing stray corrosion in the guiding grooves on the outer surface of an anesthetic puncture needle is provided, including:

[0006] Step 1, constructing a multi-physical-field coupling model, where the multi-physical-field coupling model includes an anesthetic puncture needle and a cathode group electrode tool;

[0007] Step 2, according to the multi-physical-field coupling model, performing multi-physical-field analysis to determine the initial electrochemical machining parameters;

[0008] Step 3, based on the initial electrochemical machining parameters, performing electrochemical machining on the anesthetic puncture needle to form the guiding grooves on the outer surface of the anesthetic puncture needle.

[0009] Preferably, step 2 includes:

[0010] Step 2.1, performing flow field analysis on the electrolyte;

[0011] Step 2.2, performing temperature field analysis on the electrolyte;

[0012] Step 2.3, performing electric field analysis on the electrolyte;

[0013] Step 2.4, determining the coupling relationship between the flow field, temperature field, and electric field;

[0014] Step 2.5: Import the multi-physical field coupling model into the simulation platform, set boundary conditions and perform simulation;

[0015] Step 2.6: Set initial electrochemical machining parameters in combination with the simulation results.

[0016] Preferably, in Step 2.6, the initial electrochemical machining parameters include machining voltage, pulse frequency, electrolyte composition, electrolyte flow rate, initial machining gap, feed depth, and the longitudinal movement speed of the cathode tool along the groove.

[0017] Preferably, in Step 3, a pulse power supply is used for machining.

[0018] Preferably, in Step 3, multi-electrode multi-station machining is adopted.

[0019] In a second aspect, a system for suppressing stray corrosion in the outer surface guiding groove of an anesthesia puncture needle is provided, which is used to execute the method according to any one of the first aspect, and includes:

[0020] A construction module for constructing a multi-physical field coupling model, where the multi-physical field coupling model includes an anesthesia puncture needle and a cathode group electrode tool;

[0021] An analysis module for performing multi-physical field analysis according to the multi-physical field coupling model to determine initial electrochemical machining parameters;

[0022] A machining module for electrochemically machining the anesthesia puncture needle based on the initial electrochemical machining parameters to form an outer surface guiding groove of the anesthesia puncture needle.

[0023] In a third aspect, a computer storage medium is provided, where a computer program is stored in the computer storage medium; when the computer program runs on a computer, the computer is enabled to execute the method according to any one of the first aspect.

[0024] In a fourth aspect, an electronic device is provided, including:

[0025] A memory for storing a computer program;

[0026] A processor for executing the computer program to implement the method according to any one of the first aspect.

[0027] The beneficial effects of the present invention are:

[0028] 1. The present invention precisely controls the electrochemical machining parameters through a multi-physical field coupling simulation model, optimizes the electrolyte flow and current distribution in the machining gap, and effectively suppresses the corrosion of the guiding groove sidewall by stray current.

[0029] 2. The present invention adopts the multi-station group electrode synchronous machining technology, and multiple anesthetic puncture needles can be machined simultaneously in a single stroke, greatly improving the machining efficiency compared with the traditional single-needle machining, and meeting the requirements of industrial mass production.

[0030] 3. The present invention uses a pulsed power supply for electrolytic machining, enabling the anode to undergo periodic intermittent electrochemical dissolution in the electrolyte. Compared with direct current electrolytic machining, it can improve the electrolytic removal efficiency and effect, enhance the electrolytic removal accuracy, and effectively suppress stray corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of the main factors affecting the electrolytic machining gap provided by the present invention;

[0032] Figure 2 is a schematic diagram of the relationship between the electric field and the machining gap provided by the present invention;

[0033] Figure 3 is a schematic diagram of the relationship between the flow field and the machining gap provided by the present invention;

[0034] Figure 4 is a cross-sectional view of the tool and fixture during the machining process provided by the present invention;

[0035] Figure 5 is a cross-sectional view of the cathode group electrode provided by the present invention;

[0036] Figure 6 is a schematic diagram of the electric field distribution model of the machining gap provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The following further describes the present invention in conjunction with embodiments. The description of the following embodiments is only for helping to understand the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0038] Embodiment 1:

[0039] To solve the problems of stray corrosion on the side wall of the guide groove caused by stray current formed by the electric field in the gap and the inability to meet the efficiency of industrial production in the prior art, Embodiment 1 of the present application provides a method for suppressing stray corrosion in the guide groove on the outer surface of the anesthetic puncture needle, including:

[0040] Step 1, constructing a multi-physical field coupling model, where the multi-physical field coupling model includes an anesthetic puncture needle and a cathode group electrode tool.

[0041] Exemplarily, using SOLIDWORKS software, a three-dimensional model of the anesthetic puncture needle and the cathode group electrode tool is constructed.

[0042] Step 2: According to the multi-physical-field coupling model, perform multi-physical-field analysis to determine the initial electrolytic machining parameters.

[0043] During the electrolytic machining process, due to the influence of the electric field, flow field distribution, and temperature field between the electrodes on the reaction process, the distribution of the machining gap is extremely uneven and the variation law is complex, making the monitoring and control of the process very difficult. On the other hand, there are more than a dozen influencing factors such as the workpiece material and electrolyte involved in the electrolytic machining process, and their combination is very complex according to the changes in the machining conditions. In order to improve the machining accuracy and save machining time, the present invention first uses the multi-physical-field coupling simulation technology to simulate the potential distribution and current density distribution diagram on the surface of the piercing needle during the electrolytic machining process, and further determines the parameters of electrolytic machining in the initial state. Subsequently, the real-time working state of electrolytic machining is reflected by the sensor collecting the X, Y, Z axis coordinate position information and the oscilloscope recording the change of current with time, and then the parameters of electrolytic machining are adjusted.

[0044] Specifically, Step 2 includes:

[0045] Step 2.1: Perform flow field analysis on the electrolyte.

[0046] To simplify the calculation, it is assumed that the electrolyte is an ideal liquid, without bubbles, solid particles, etc., and is a continuous incompressible viscous fluid. During the electrolytic machining process, the flow velocity is one of the important parameters to ensure the stability of the machining process. When the electrolyte is in a turbulent state, a higher flow velocity can quickly remove the products and heat in the machining gap and ensure the smooth progress of the machining process. For the closed electrolyte region Perform flow field analysis. According to the law of conservation of mass and the law of conservation of momentum, the fluid flow satisfies:

[0047]

[0048] In the formula, is the density of the electrolyte, is the flow velocity, t is the time, is the pressure of the electrolyte, T is the temperature of the electrolyte, is the dynamic viscosity of the electrolyte, is the turbulent viscosity coefficient.

[0049] Step 2.2: Perform temperature field analysis on the electrolyte.

[0050] During the electrolytic machining process, the temperature of the electrolyte in the machining gap is affected by the interaction of the electric field and the flow field, and it satisfies the convection-diffusion equation:

[0051]

[0052] In the formula, is the specific heat capacity of the electrolyte, where \(\lambda\) is the thermal conductivity of the electrolyte and \(Q\) is the heat generated during the machining process.

[0053] The heat generated during the machining process mainly comes from two aspects: (1) Joule heat generated by the current in the machining gap; (2) heat generated by the electrode reaction. Since the heat generated by the latter is less and can be ignored, according to Ohm's law, we have:

[0054]

[0055] In the formula, \(i\) is the current density, and \(\varphi\) is the electric potential.

[0056] Step 2.3: Conduct an electric field analysis on the electrolyte.

[0057] In the actual electrolytic machining process, the machining rate is usually represented by the erosion rate in the normal direction of the anode metal surface. Based on Faraday's law and considering the influence of current efficiency, we have:

[0058]

[0059] In the formula, \(v\) is the electrolytic machining rate, \(\eta\) is the current efficiency, \(Z\) is the volume electrochemical equivalent. From Ohm's law, we can get:

[0060]

[0061] In the formula, \(\sigma\) is the conductivity. In the actual electrolytic machining process, the conductivity is affected by the temperature and bubble rate of the electrolyte. In this application, it is assumed that the electrolyte is an ideal liquid without bubbles, so the conductivity is only related to the temperature, and the relationship is:

[0062]

[0063] In the formula, \(\sigma_0\) is the initial conductivity, \(\alpha\) is the temperature-related coefficient, \(T_0\) is the initial temperature.

[0064] Step 2.4: Determine the coupling relationship between the flow field, temperature field, and electric field.

[0065] During the electrolytic machining process, the flow field, temperature field, and electric field affect each other. The flow field and electric field affect the distribution of the temperature field, and the conductivity of the electrolyte is affected by the temperature field distribution. It can be obtained that the coupling equations of the flow field, temperature field, and electric field during the electrolytic machining process are:

[0066]

[0067] Research shows that the temperature rise of the electrolyte flowing through the machining gap is:

[0068]

[0069] In the formula, L is the flow length.

[0070] Step 2.5: Import the multi-physics coupling model into the simulation platform and set the boundary conditions for simulation.

[0071] Specifically, import the model into the COMSOL Multiphysics software, add physical fields of turbulence, current, and deformed geometry, set the boundary conditions. In the turbulence physical field, as Figure 6 shown, boundary is the electrolyte inlet, set the pressure Pa, boundary is the electrolyte outlet, set the pressure Pa; in the solid heat transfer physical field, add fluid heat transfer, heat flux, and outflow, where the heat flux selects all boundaries, and the outflow selects boundary ; in the current and deformed geometry physical fields, boundary is grounded, boundary is applied with an electric potential, and specify the normal grid velocity of . The electrolyte is + solution, the initial conductivity is 7.47 , the thermal conductivity of the electrolyte is 0.68 , the heat transfer coefficient is 15000 , the atmospheric pressure heat capacity is 4200 , the initial temperature is 20 °C, the initial voltage is 5 V, then divide the grid and perform the solution calculation.

[0072] Step 2.6: Set the initial electrochemical machining parameters in combination with the simulation results.

[0073] In Step 2.6, using the comsol simulation software to simulate and study the variation laws of each physical field in the machining of the guide groove under the coupling of multi-physics in electrochemical machining, the accurate variation laws of the inter-pole parameters can be obtained, effectively predicting the machining process, shortening the test cycle, improving the machining accuracy, guiding the actual electrochemical machining process of the guide groove, and providing guarantee for the mass production of workpieces.

[0074] ​Exemplarily, as the electrolyte flow rate increases per unit time, the streamline distribution is similar. The flow velocity at the grooving inlet can reach 3 m / s, the streamline is stable without liquid shortage, and the interpolar products can be carried away in time to ensure stable processing. In addition, the value of the initial current density around the processing area increases as the processing gap decreases. A too large processing gap will affect the current distribution and weaken the interpolar electric field. When processing with a small gap, the interpolar current density distribution is uniform, which can improve the processing efficiency on the basis of ensuring the forming accuracy of the guiding groove. However, too small a gap is likely to cause difficulty in discharging electrolytic products and result in short-circuit burning of the cathode. Therefore, the initial processing gap selected in this application is 0.1 mm.

[0075] Specifically, the processing voltage is a constant voltage of 5 V, and the pulse frequency is 500 Hz; the electrolyte is a composite electrolyte with a concentration + The flow rate of the electrolyte is 3 m / s; the initial processing gap is 0.1 mm; the feed depth is 0.6 mm; the moving speed of the cathode tool along the longitudinal direction of the groove is 6 mm / min; 9 workpieces are processed in a single test.

[0076] In step 2.6, the initial electrolytic processing parameters include processing voltage, pulse frequency, electrolyte composition, electrolyte flow rate, initial processing gap, feed depth, and the moving speed of the cathode tool along the longitudinal direction of the groove.

[0077] Step 3: Based on the initial electrolytic processing parameters, electrolytically process the anesthesia puncture needle to form a guiding groove on the outer surface of the anesthesia puncture needle.

[0078] Example 2:

[0079] On the basis of Example 1, Example 2 of this application provides a more specific method for suppressing stray corrosion in the guiding groove on the outer surface of the anesthesia puncture needle, including:

[0080] Step 1: Construct a multi-physical-field coupling model, which includes an anesthesia puncture needle and a cathode group electrode tool.

[0081] Step 2: According to the multi-physical-field coupling model, perform multi-physical-field analysis to determine the initial electrolytic processing parameters.

[0082] Step 3: Based on the initial electrolytic processing parameters, electrolytically process the anesthesia puncture needle to form a guiding groove on the outer surface of the anesthesia puncture needle.

[0083] During the electrochemical machining process, a large amount of electrolyte flows through the machining gap. At the same time, electrolysis products (such as hydrogen gas and iron hydroxide precipitation) generated by the electrochemical reactions occurring at the cathode and anode make the electrolyte in the machining gap a three-phase flow containing gas, liquid, and solid. If the metal hydroxide content in the electrolyte is too high, it will cause the electrolyte viscosity to be too large, which will affect its fluidity and avoid problems such as sticking to the surface to be machined and causing contact short circuits of the electrode. In step 3, the present application adopts electrolyte flow and circulating reflux treatment technology. To ensure the sustainability of the electrochemical machining process, the circulating liquid supply of the electrolyte system must be stable, reliable, inexpensive for storage, safe and non-toxic, and capable of quickly removing metal hydroxides from the electrolyte.

[0084] Specifically, the electrolyte flow and circulating reflux treatment technology includes:

[0085] The first step: Select a guide groove component that has been UV-coated in the same batch as the sample of the workpiece to be machined, and the fixture clamps the workpiece.

[0086] The second step: Use a constant-pressure variable-frequency pressure pump to pump the electrolyte, and continuously and stably supply the qualified clean electrolyte NaNO3 to the machining gap through the electrolyte injection component, forming a fluid domain between the cathode and anode. The electrolyte flow mode is the side-flow type.

[0087] The third step: Purify the recycled dirty electrolyte to remove the metal and metal hydroxides in it to prevent short circuits between the electrodes.

[0088] The fourth step: Regularly treat the precipitation in the electrolyte tank and the harmful ions generated under certain special machining conditions. To ensure that the machine tool can perform long-term machining, the purification speed of the electrolyte in the electrolyte system cannot be slower than the liquid supply speed.

[0089] In addition, when using a DC power supply for electrochemical machining, if the current density remains constant all the time, it will cause serious stray erosion of the machined surface and affect the forming accuracy of the workpiece. In step 3, the present application uses a pulse power supply (such as a high-frequency narrow pulse) for machining. Compared with the DC power supply, high-frequency narrow pulse electrochemical machining can reduce the uneven distribution of conductivity. During the very short pulse machining time, the reaction products are reduced, so that the electrolyte in the machining gap can timely carry away the electrolysis products, reaction heat, and self-renew during the pulse interval time, thereby improving the machining forming accuracy and repeatability accuracy. When using a pulse power supply, a pressure wave with the same frequency as the power supply will be generated in the machining gap, which can stir the electrolyte, thus promoting the update of the electrolyte; at the same time, during the pulse base value period, the erosion reaction of the anode temporarily stops, which is beneficial to the discharge of electrolysis products from the machining gap.

[0090] Specifically, the high-frequency narrow pulse electrochemical machining technology includes:

[0091] Step 1: The working box moves horizontally in the X and Y directions, and the column moves vertically upward along the Z direction to lift the pillow. The feeding system uses a DC servo motor control method.

[0092] Step 2: After the electrolytic machining cathode tool and the workpiece are clamped, the electrolytic cathode is electrically connected to the negative pole of the pulse power supply, and the workpiece is electrically connected to the positive pole of the pulse power supply. After the electrolyte is injected into the electrolyte tank, it submerges the machining area. Increasing the pulse voltage frequency is beneficial to improving the machining localization and reducing stray corrosion. Therefore, a pulse frequency of 10 KHz and a duty cycle of 50% are used.

[0093] Step 3: The numerical control system drives the electrolytic machining cathode to move to the surface of the contour to be machined of the workpiece, and drives the displacement of the electrolytic machining cathode so that the electrolytic cathode faces the surface of the contour to be machined. When using an excessive initial machining gap, the electrode is far from the workpiece, which is prone to stray corrosion, and the aspect ratio of the microgroove machined is small. If the machining gap is too small, it is not conducive to the renewal of the electrolyte and the discharge of machining products, and short-circuit phenomena are likely to occur, reducing the machining stability. Considering comprehensively, the initial machining gap is set to 20 mm.

[0094] Step 4: The numerical control system controls the electrode tool to continuously feed towards the surface of the contour to be machined, and adjusts the machining gap value between the electrolytic machining electrode and the surface of the machining contour by the contraction of the telescopic shaft. Using the principle of anodic dissolution, the guiding groove on the outer surface of the anesthetic puncture needle is machined until the machining gap meeting the machining requirements is reached.

[0095] Step 5: The pulse power supply is powered on, and the numerical control system controls the displacement adjustment of the electrolytic machining electrode according to the machining trajectory, so that the current between the electrolytic cathode and the workpiece anode always remains within a certain range. The electrolytic machining is carried out, and the electrolyte ejected during the machining process always flushes the surface of the contour facing the direction of the contour to be machined, so that the electrolyte in the closed contour area of the workpiece is quickly discharged, realizing the rapid renewal of the electrolyte and the rapid discharge of electrolytic products.

[0096] In addition, due to the small size of the catheter, if single-piece machining is adopted, the efficiency of industrial production cannot be met. Therefore, to improve the machining efficiency of the workpiece. In Step 3, the present application uses a group electrode to achieve a single-time multi-piece machining method to meet the requirements of mass production. Specifically, the multi-station machining technology of the group electrode includes:

[0097] Step 1: When the numerical control system controls the electrolytic machining electrode to return to the initial machining position, a single machining stroke ends.

[0098] Step 2: According to the machining accuracy and the requirements of the machining surface roughness, repeat the above operations for secondary stroke machining or multiple stroke machining.

[0099] The present invention adopts the technology of multi-station electrolytic machining based on high-frequency narrow pulse width, thus overcoming the problems of cumbersome operation and low efficiency in single-station electrolytic machining under the control of DC power supply in the prior art, and achieving high-efficiency mass production, effectively suppressing stray corrosion in the electrolytic machining process, and significantly improving the accuracy and quality of the machining of the guide groove.

[0100] Exemplarily, by observing the surface quality of the workpiece through a microscope, there are fewer phenomena of pitting and spalling, and the surface of the workpiece presents a bright metallic color. Through comprehensive experimental data analysis, it is found that, as shown in Table 1, by randomly extracting the dimensions of different workpieces in the same group, the electrolytic machining of multi-station micro-slender grooves has achieved good replication accuracy, and the dimension range basically meets the actual production requirements. The machining device and method of the present invention improve the dimensional accuracy of the guide groove, achieve high-efficiency mass production, effectively suppress stray corrosion in the electrolytic machining process, and significantly improve the accuracy and quality of the machining of the guide groove.

[0101] Table 1

[0102]

[0103] It should be noted that the parts that are the same or similar to those in Embodiment 1 in this embodiment can be referred to each other, and will not be described in detail in this application.

[0104] Embodiment 3:

[0105] Based on Embodiment 2, Embodiment 3 of the present application provides a system for suppressing stray corrosion in the guide groove on the outer surface of an anesthetic puncture needle, including:

[0106] A construction module for constructing a multi-physical-field coupling model, where the multi-physical-field coupling model includes an anesthetic puncture needle and a cathode group electrode tool;

[0107] An analysis module for performing multi-physical-field analysis according to the multi-physical-field coupling model to determine initial electrolytic machining parameters;

[0108] A machining module for performing electrolytic machining on the anesthetic puncture needle based on the initial electrolytic machining parameters to form a guide groove on the outer surface of the anesthetic puncture needle.

[0109] It should be noted that the system provided in this embodiment is the system corresponding to the method provided in Embodiment 2. Therefore, the parts that are the same or similar to those in Embodiment 2 in this embodiment can be referred to each other, and will not be described in detail in this application.

Claims

1. A method for inhibiting stray corrosion in the guiding groove on the outer surface of an anesthetic puncture needle, characterized in that, Including: Step 1: Construct a multi-physical field coupling model, where the multi-physical field coupling model includes an anesthetic puncture needle and a cathode group electrode tool; Step 2: According to the multi-physical field coupling model, conduct multi-physical field analysis to determine the initial electrochemical machining parameters; Step 3: Based on the initial electrochemical machining parameters, perform electrochemical machining on the anesthetic puncture needle to form a guiding groove on the outer surface of the anesthetic puncture needle.

2. The method for suppressing stray corrosion in the outer surface guiding groove of the anesthetic puncture needle according to claim 1, characterized in that Step 2 includes: Step 2.1: Conduct a flow field analysis on the electrolyte; Step 2.2: Conduct a temperature field analysis on the electrolyte; Step 2.3: Conduct an electric field analysis on the electrolyte; Step 2.4: Determine the coupling relationship between the flow field, temperature field, and electric field; Step 2.5: Import the multi-physical field coupling model into a simulation platform, set boundary conditions for simulation; Step 2.6: Combine the simulation results to set the initial electrochemical machining parameters.

3. The method for suppressing stray corrosion in the outer surface guiding groove of the anesthesia puncture needle according to claim 2, characterized in that, In Step 2.6, the initial electrochemical machining parameters include machining voltage, pulse frequency, electrolyte composition, electrolyte flow rate, initial machining gap, feed depth, and the longitudinal movement speed of the cathode tool along the groove.

4. The method for suppressing stray corrosion in the guiding groove on the outer surface of the anesthetic puncture needle according to claim 3, characterized in that, In Step 3, a pulse power supply is used for machining.

5. The method for suppressing stray corrosion in the outer surface guiding groove of the anesthetic puncture needle according to claim 4, wherein In Step 3, group electrode multi-station machining is adopted.

6. A stray corrosion inhibition system in the guiding groove on the outer surface of an anesthetic puncture needle, characterized in that, For implementing the method according to any one of claims 1 to 5, including: A construction module, used for constructing a multi-physical field coupling model, where the multi-physical field coupling model includes an anesthetic puncture needle and a cathode group electrode tool; An analysis module, used for conducting multi-physical field analysis according to the multi-physical field coupling model to determine the initial electrochemical machining parameters; A machining module, used for performing electrochemical machining on the anesthetic puncture needle based on the initial electrochemical machining parameters to form a guiding groove on the outer surface of the anesthetic puncture needle.

7. A computer storage medium, characterized in that, The computer storage medium stores a computer program; when the computer program runs on a computer, it causes the computer to execute the method according to any one of claims 1 to 5.

8. An electronic device, characterized in that, Including: A memory, used for storing the computer program; A processor, used for executing the computer program to implement the method according to any one of claims 1 to 5.

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