CN119026430A - A method for inhibiting stray corrosion in electrochemical machining of anesthesia puncture needles based on UV coating technology - Google Patents
A method for inhibiting stray corrosion in electrochemical machining of anesthesia puncture needles based on UV coating technology Download PDFInfo
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Abstract
本发明涉及基于UV涂覆技术的麻醉穿刺针电解加工杂散腐蚀抑制方法，包括：建立麻醉穿刺针的电场仿真模型；根据预设电场强度阈值和电场仿真模型，确定第一目标涂覆区域；对第一目标涂覆区域的边界选取关键节点，进行NURBS曲线拟合，生成光滑曲线边界；判断光滑曲线边界所对应的第二目标涂覆区域是否覆盖第一目标涂覆区域，若是，则对第二目标涂覆区域进行UV绝缘层的涂覆操作；若否，重新生成光滑曲线边界。本发明的有益效果是：本发明通过电场仿真模型精确识别麻醉穿刺针在电解加工过程中易受杂散腐蚀的高电场强度区域。随后，利用NURBS曲线拟合技术生成光滑曲线边界，有效抑制电解加工过程中的杂散腐蚀。
The present invention relates to a method for inhibiting stray corrosion in electrolytic machining of anesthesia puncture needles based on UV coating technology, comprising: establishing an electric field simulation model of anesthesia puncture needles; determining a first target coating area according to a preset electric field strength threshold and an electric field simulation model; selecting key nodes for the boundary of the first target coating area, performing NURBS curve fitting, and generating a smooth curve boundary; determining whether the second target coating area corresponding to the smooth curve boundary covers the first target coating area, and if so, performing a UV insulating layer coating operation on the second target coating area; if not, regenerating a smooth curve boundary. The beneficial effect of the present invention is that the present invention accurately identifies high electric field strength areas of anesthesia puncture needles that are susceptible to stray corrosion during electrolytic machining through an electric field simulation model. Subsequently, a smooth curve boundary is generated using NURBS curve fitting technology to effectively inhibit stray corrosion during electrolytic machining.
Description
Technical Field
The invention relates to the technical field of image extraction, in particular to an electrolytic machining stray corrosion inhibition method for an anesthesia puncture needle based on a UV coating technology.
Background
Medical dural puncture needles are widely applied to medical diagnosis and treatment processes, and the precision and durability of the medical dural puncture needles directly influence the safety and effectiveness of operation. In the prior art, electrolytic machining is generally used to machine the guide grooves on the surface of the puncture needle. However, stray corrosion is easy to generate in a non-processing area in the electrolytic processing process, and the corrosion not only can reduce the quality of the guide groove, but also can make the guide groove unable to effectively restrict the small needle matched with the guide groove, so that the small needle slides out from two sides of the guide groove in the matched use process, and the stability and the accuracy of operation are affected.
Currently, common technical means include adjusting electrolyte concentration, improving cathode design, adding electric field shielding devices, adjusting pulse parameters of the machining power supply, and controlling repeated feeding of the cathode cutter in order to inhibit stray corrosion. However, these methods have some limitations. First, adjusting electrolyte concentration and improving cathode design has difficulty in thoroughly solving the problem of electric field leakage in non-machined areas, and may introduce new process complexities. Secondly, although the electric field shielding device can control electric field distribution to a certain extent, the structure is complex, uneven shielding is easy to cause, and the processing quality is unstable. In addition, the method of repeated feeding using a pulse power source and a cathode cutter can reduce stray corrosion to some extent, but can significantly reduce machining efficiency.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides an electrolytic machining stray corrosion inhibition method for an anesthesia puncture needle based on a UV coating technology.
In a first aspect, a method for inhibiting electrolytic machining spurious corrosion of an anesthesia puncture needle based on a UV coating technology is provided, comprising the following steps:
s1, establishing an electric field simulation model of an anesthesia puncture needle;
S2, determining a first target coating area according to a preset electric field intensity threshold value and the electric field simulation model; the first target coating area is an area with the electric field intensity larger than the preset electric field intensity threshold value in the electric field simulation model;
s3, selecting a key node for the boundary of the first target coating area, and performing NURBS curve fitting according to the key node to generate a smooth curve boundary;
S4, judging whether a second target coating area corresponding to the smooth curve boundary covers the first target coating area, if so, carrying out coating operation of the UV insulating layer on the second target coating area; if not, the weight of the key node is adjusted, and a smooth curve boundary is regenerated.
Preferably, S1 includes:
s101, establishing a three-dimensional model of an anesthesia puncture needle and a cathode cutter used for actual processing;
S102, carrying out grid division on the anesthesia needle, the cathode cutter and electrolyte between the two, establishing an electric field model, setting relevant parameters of the electric field model in software, and then calculating the electric field intensity between the cathode cutter and the anesthesia puncture needle to obtain the electric field intensity distribution of each point on the needle surface of the anesthesia puncture needle; the relevant parameters of the electric field model comprise electrolyte conductivity, anode and cathode surface balance points, exchange current density of the anode and cathode surfaces and electric field intensity values of the anesthesia puncture needle surface in an initial simulation processing state;
S103, drawing an electric field intensity contour map according to the electric field intensity distribution.
Preferably, in S3, the key node is a point, inflection point or a position with a large change in curvature in the boundary of the first target coating region.
Preferably, in S4, the performing a coating operation of the UV insulation layer on the second target coating area includes:
Fixing and exposing the anesthesia puncture needle to a UV ink spraying device;
Uniformly coating UV ink in a second target coating area by the UV ink spraying device;
And irradiating the second target coating area by using a strong ultraviolet lamp, and curing the UV ink under ultraviolet irradiation to form a UV insulating layer.
Preferably, the method further comprises:
s5, after the anesthesia puncture needle with the UV insulation layer is subjected to electrolytic machining, the UV insulation layer is scraped by soaking in ethanol and using a sheet with lower hardness than that of the puncture needle.
In a second aspect, there is provided an anesthesia needle electrolytic machining spurious corrosion inhibition system based on UV coating technology for performing the method of any one of the first aspects, comprising:
the setting module is used for setting an electric field simulation model of the anesthesia puncture needle;
The determining module is used for determining a first target coating area according to a preset electric field intensity threshold value and the electric field simulation model; the first target coating area is an area with the electric field intensity larger than the preset electric field intensity threshold value in the electric field simulation model;
the generating module is used for selecting key nodes from the boundary of the first target coating area, and carrying out NURBS curve fitting according to the key nodes to generate a smooth curve boundary;
The judging module is used for judging whether a second target coating area corresponding to the smooth curve boundary covers the first target coating area or not, if so, carrying out coating operation of the UV insulating layer on the second target coating area; if not, the weight of the key node is adjusted, and a smooth curve boundary is regenerated.
In a third aspect, a computer storage medium having a computer program stored therein is provided; the computer program, when run on a computer, causes the computer to perform the method of any of the first aspects.
The beneficial effects of the invention are as follows:
1. The invention accurately identifies the high electric field intensity region of the anesthesia puncture needle, which is easy to be corroded by stray in the electrolytic machining process, through the electric field simulation model. And then, generating a smooth curve boundary by using NURBS curve fitting technology, ensuring that the UV insulating layer can accurately cover the high-risk areas, and effectively inhibiting stray corrosion in the electrolytic machining process. The accurate coating method not only reduces unnecessary material consumption, but also obviously improves the durability and the use safety of the puncture needle, and avoids performance degradation or failure risk caused by corrosion.
2. The invention combines electric field simulation, NURBS curve fitting and UV coating technology to form an automatic and systematic processing flow. Through the preset electric field intensity threshold value and the fine simulation calculation, potential corrosion problems can be predicted and dealt with in advance, so that the electrolytic machining parameters and the coating strategy are optimized. The intelligent processing flow shortens the production period and improves the consistency and stability of the product quality.
3. The invention adopts UV coating technology to replace the traditional antiseptic treatment method, such as electroplating or chemical coating, and has remarkable environmental protection advantage. The UV ink is rapidly solidified under the irradiation of ultraviolet light, high-temperature baking or a large amount of chemical reagents are not needed, and the emission of harmful substances and the energy consumption are reduced. Meanwhile, the UV insulating layer can accurately cover the area to be protected, so that excessive use of materials is avoided, and the production cost is further reduced.
Drawings
FIG. 1 is a schematic flow chart of an electrolytic machining spurious corrosion inhibition method for an anesthesia puncture needle based on a UV coating technology provided by an embodiment of the invention;
FIG. 2 is a flow chart of determining a coating area provided by an embodiment of the present invention;
FIG. 3 is a flow chart of generating a coated region boundary provided by an embodiment of the present invention;
FIG. 4 is a graph of electric field intensity at the surface of a needle cannula according to an embodiment of the present invention;
FIG. 5 is a contour plot of the electric field intensity at the surface of a syringe provided by an embodiment of the invention;
FIG. 6 is a schematic illustration of a coated area edge drawn using NURBS curves provided by an embodiment of the present invention;
FIG. 7 is a schematic diagram of the practical UV coating results provided in the examples of the present invention;
FIG. 8 is a schematic view of the processing effect without UV coating insulation after electrolytic processing according to an embodiment of the present invention;
FIG. 9 is a schematic view of the processing effect of UV coated insulation after electrolytic processing according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of an electrolytic machining spurious corrosion inhibition system for an anesthesia puncture needle according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to examples. The following examples are presented only to aid in the understanding of the invention. It should be noted that it will be apparent to those skilled in the art that modifications can be made to the present invention without departing from the principles of the invention, and such modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Example 1:
In order to solve the problem of stray corrosion in a non-processing area caused by electrolytic processing in the prior art and improve the processing precision and quality of a guide groove, as shown in fig. 1, embodiment 1 of the application provides an anesthesia puncture needle electrolytic processing stray corrosion inhibition method based on a UV coating technology, which comprises the following steps:
s1, establishing an electric field simulation model of the anesthesia puncture needle.
Specifically, S1 includes:
s101, establishing a three-dimensional model of the anesthesia puncture needle and a cathode cutter used for actual processing.
In the embodiment of the application, the cathode cutter is used as the cathode of the electric field in the electrolytic machining process, and the potential difference is formed according to the cathode cutter, so that the electric field intensity distribution is formed.
S102, carrying out grid division on the anesthesia needle, the cathode cutter and electrolyte between the two, establishing an electric field model, setting relevant parameters of the electric field model in software, and then calculating the electric field intensity between the cathode cutter and the anesthesia puncture needle to obtain the electric field intensity distribution of each point on the needle surface of the anesthesia puncture needle; the relevant parameters of the electric field model comprise electrolyte conductivity, anode and cathode surface balance points, exchange current density of the anode and cathode surfaces and electric field intensity values of the anesthesia puncture needle surface in an initial simulation processing state.
In S102, grid division is used for calculating electric field intensity distribution between the cathode cutter and the anesthesia puncture needle, so that the subsequent extraction and analysis of the electric field intensity on the surface of the anesthesia puncture needle are facilitated.
In S102, the mesh division of the gap between the upper half surface of the needle tube and the cutter can be as much as possible, so that the simulation result is closer to the actual situation. Illustratively, FIG. 4 shows an isometric-directed needle cannula surface field intensity plot.
S103, drawing an electric field intensity contour map according to the electric field intensity distribution.
As shown in fig. 5, the electric field intensity contour map was drawn by simulation software. And (3) setting a reasonable electric field intensity threshold required by S2 through electric field intensity comparison analysis of an electrolytic machining area and a non-electrolytic machining area on the surface of the needle tube.
S2, determining a first target coating area according to a preset electric field intensity threshold value and the electric field simulation model; the first target coating area is an area with the electric field intensity larger than the preset electric field intensity threshold value in the electric field simulation model.
During electrolytic machining, stray corrosion to non-machined areas occurs mainly before the electrode reaches the feed balance gap during the initial stage of machining. In order to solve the stray corrosion phenomenon, the invention firstly simulates the electric field intensity distribution of the surface of the anesthesia puncture needle in the electrolytic machining process by an electric field simulation technology, and further determines the area to be coated. As shown in fig. 2, through S101 to S103 and S2, it is possible to determine a region where the insulating layer needs to be applied.
And S3, as shown in FIG. 3, selecting a key node for the boundary of the first target coating area, and performing NURBS curve fitting according to the key node to generate a smooth curve boundary.
Since the boundary of the coating region (i.e., the first target coating region) extracted by simulation usually has an irregular and unsmooth condition, direct coating may cause the quality of the boundary of the insulating layer to be reduced, and the corrosion prevention effect is affected, and especially, the focus of preventing the stray corrosion is near the boundary line of the electrolytic processing region and the non-electrolytic processing region. As shown in fig. 6, the present invention uses NURBS curve technique to optimize the boundary of the coated area. The NURBS curve, due to its flexibility and accuracy, is able to effectively smooth the boundary so that the coated area has a continuous and smooth edge. This step is critical to ensure uniformity of the UV coating and quality of the guide groove after processing.
In S3, the key node is a point of sharp, inflection or a position where the curvature change is large in the boundary of the first target coating region.
S4, judging whether a second target coating area corresponding to the smooth curve boundary covers the first target coating area, if so, carrying out coating operation of the UV insulating layer on the second target coating area; if not, the weight of the key node is adjusted, and a smooth curve boundary is regenerated.
In addition, it is also necessary to generate DXF files identified by the spraying device after confirming that the second target coating zone covers the first target coating zone.
Example 2:
on the basis of the embodiment 1, the embodiment 2 of the application provides a more specific method for inhibiting the electrolytic machining stray corrosion of an anesthesia puncture needle based on a UV coating technology, which comprises the following steps:
s1, establishing an electric field simulation model of the anesthesia puncture needle.
S2, determining a first target coating area according to a preset electric field intensity threshold value and the electric field simulation model; the first target coating area is an area with the electric field intensity larger than the preset electric field intensity threshold value in the electric field simulation model.
S3, selecting a key node for the boundary of the first target coating area, and performing NURBS curve fitting according to the key node to generate a smooth curve boundary.
S4, judging whether a second target coating area corresponding to the smooth curve boundary covers the first target coating area, if so, carrying out coating operation of the UV insulating layer on the second target coating area; if not, the weight of the key node is adjusted, and a smooth curve boundary is regenerated.
In S4, performing a coating operation of the UV insulation layer on the second target coating region, including:
Coating preparation: the anesthesia puncture needle is fixed on a special fixture, so that the anesthesia puncture needle cannot move or deflect in the coating process. And exposing the surface of the needle body under the UV ink spraying device by using a precisely controlled moving platform.
And (3) spraying UV ink: the UV ink is uniformly coated in the target area by the UV ink. Since NURBS curves provide accurate boundaries, control during the spraying process can ensure that ink does not spill over to non-target areas.
UV curing: and irradiating the second target coating area by using a strong ultraviolet lamp, wherein the UV ink can be cured within a few seconds under the irradiation of ultraviolet light, so that a stable insulating layer is formed. The insulating layer has good corrosion resistance and can effectively prevent stray corrosion. By way of example, fig. 7 shows the results of coating with UV in practice. Further, as can be seen from comparison of fig. 8 and 9, by UV coating the electroless region, stray corrosion of the electroless region during processing can be effectively suppressed.
S5, after the anesthesia puncture needle with the UV insulation layer is subjected to electrolytic machining, the UV insulation layer is scraped by soaking in ethanol and using a sheet with lower hardness than that of the puncture needle.
Specifically, S5 includes:
s501, soaking in ethanol: the puncture needle coated with the insulating layer is immersed in an ethanol solution. The ethanol can effectively dissolve or soften the insulating layer after the UV ink is cured, and preparation is made for subsequent mechanical removal.
S502, mechanically scraping: after soaking, the insulating layer is gently scraped off by a thin sheet (such as a nylon sheet) with lower hardness than the material of the surface of the puncture needle. Because the nylon sheet has low hardness, the surface of the needle body is not scratched or damaged, and the surface smoothness and the integrity of the removed coating are ensured.
In this embodiment, the same or similar parts as those in embodiment 1 may be referred to each other, and will not be described in detail in the present disclosure.
Example 3:
On the basis of the embodiment 1, the embodiment 3 of the application provides an anesthesia puncture needle electrolytic machining stray corrosion inhibition system based on a UV coating technology, as shown in fig. 10, comprising:
the setting module is used for setting an electric field simulation model of the anesthesia puncture needle;
The determining module is used for determining a first target coating area according to a preset electric field intensity threshold value and the electric field simulation model; the first target coating area is an area with the electric field intensity larger than the preset electric field intensity threshold value in the electric field simulation model;
the generating module is used for selecting key nodes from the boundary of the first target coating area, and carrying out NURBS curve fitting according to the key nodes to generate a smooth curve boundary;
The judging module is used for judging whether a second target coating area corresponding to the smooth curve boundary covers the first target coating area or not, if so, carrying out coating operation of the UV insulating layer on the second target coating area; if not, the weight of the key node is adjusted, and a smooth curve boundary is regenerated.
Specifically, the system provided in this embodiment is a system corresponding to the method provided in embodiment 1, so that the portions in this embodiment that are the same as or similar to those in embodiment 1 may be referred to each other, and will not be described in detail in this disclosure.
Claims (7)
1. The method for inhibiting the electrolytic machining stray corrosion of the anesthesia puncture needle based on the UV coating technology is characterized by comprising the following steps of:
s1, establishing an electric field simulation model of an anesthesia puncture needle;
S2, determining a first target coating area according to a preset electric field intensity threshold value and the electric field simulation model; the first target coating area is an area with the electric field intensity larger than the preset electric field intensity threshold value in the electric field simulation model;
s3, selecting a key node for the boundary of the first target coating area, and performing NURBS curve fitting according to the key node to generate a smooth curve boundary;
S4, judging whether a second target coating area corresponding to the smooth curve boundary covers the first target coating area, if so, carrying out coating operation of the UV insulating layer on the second target coating area; if not, the weight of the key node is adjusted, and a smooth curve boundary is regenerated.
2. The method for suppressing electrolytic machining spurious corrosion of an anesthesia puncture needle based on a UV coating technology according to claim 1, wherein S1 comprises:
s101, establishing a three-dimensional model of an anesthesia puncture needle and a cathode cutter used for actual processing;
S102, carrying out grid division on the anesthesia needle, the cathode cutter and electrolyte between the two, establishing an electric field model, setting relevant parameters of the electric field model in software, and then calculating the electric field intensity between the cathode cutter and the anesthesia puncture needle to obtain the electric field intensity distribution of each point on the needle surface of the anesthesia puncture needle; the relevant parameters of the electric field model comprise electrolyte conductivity, anode and cathode surface balance points, exchange current density of the anode and cathode surfaces and electric field intensity values of the anesthesia puncture needle surface in an initial simulation processing state;
S103, drawing an electric field intensity contour map according to the electric field intensity distribution.
3. The method for suppressing electrolytic machining spurious corrosion of an anesthesia puncture needle based on the UV coating technology according to claim 2, wherein in S3, the key node is a sharp point or an inflection point in the boundary of the first target coating region.
4. The method for suppressing spurious corrosion in electrolytic machining of an anesthetic puncture needle based on UV coating technology according to claim 3, wherein in S4, the coating operation of the UV insulation layer on the second target coating region comprises:
Fixing and exposing the anesthesia puncture needle to a UV ink spraying device;
Uniformly coating UV ink in a second target coating area by the UV ink spraying device;
And irradiating the second target coating area by using a strong ultraviolet lamp, and curing the UV ink under ultraviolet irradiation to form a UV insulating layer.
5. The method for inhibiting the electrolytic machining stray corrosion of an anesthetic puncture needle based on the UV coating technology according to claim 4, further comprising:
s5, after the anesthesia puncture needle with the UV insulation layer is subjected to electrolytic machining, the UV insulation layer is scraped by soaking in ethanol and using a sheet with lower hardness than that of the puncture needle.
6. An anesthesia puncture needle electrolytic machining spurious corrosion suppression system based on UV coating technology, characterized by being adapted to perform the method of any one of claims 1 to 5, comprising:
the setting module is used for setting an electric field simulation model of the anesthesia puncture needle;
The determining module is used for determining a first target coating area according to a preset electric field intensity threshold value and the electric field simulation model; the first target coating area is an area with the electric field intensity larger than the preset electric field intensity threshold value in the electric field simulation model;
the generating module is used for selecting key nodes from the boundary of the first target coating area, and carrying out NURBS curve fitting according to the key nodes to generate a smooth curve boundary;
The judging module is used for judging whether a second target coating area corresponding to the smooth curve boundary covers the first target coating area or not, if so, carrying out coating operation of the UV insulating layer on the second target coating area; if not, the weight of the key node is adjusted, and a smooth curve boundary is regenerated.
7. A computer storage medium, wherein a computer program is stored in the computer storage medium; the computer program, when run on a computer, causes the computer to perform the method of any of claims 1 to 5.
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