Pen point performance detection method

Abstract

The invention discloses a method for detecting the performance of a pen point. The method comprises the following steps: (1) detecting the hardness and wear resistance of a material, wherein the detection comprises a nick hardness test and a friction coefficient test; (2) checking contact pressure; (3) writing function and performance detection including ink outlet uniformity test and dynamic writing test; (4) durability testing; (5) microstructure analysis and abrasion mechanism research; and (6) an extreme environment simulation test is carried out. The method can break through the limitation of an existing resin pen nib performance detection method, the performance of the nib in a complex environment and a special use scene is comprehensively and deeply evaluated, the basic writing performance of the nib is covered, and the stability and durability of the nib under the conditions of different temperatures, humidity, pressure and the like are further included; therefore, the pen point is ensured to be excellent in performance in various actual use scenes.

Description

Technical Field

[0001] The invention relates to a pen tip performance detection method. Background Art

[0002] Accurately testing nib performance is crucial during the nib manufacturing process. While existing methods for testing resin pen nibs can assess some common properties, they still have limitations and cannot fully assess the performance and reliability of nibs in various complex environments and special usage scenarios. With increasing user expectations for pen nib performance and the increasing diversification of pen nib application scenarios, developing a more comprehensive nib performance testing method is of great practical significance. Summary of the Invention

[0003] In view of the above-mentioned defects of the prior art, an object of the present invention is to provide a method for detecting pen tip performance.

[0004] The technical solution of the present invention is: a pen tip performance detection method, comprising the following steps:

[0005] (1) Material hardness and wear resistance testing: including indentation hardness test and friction coefficient test;

[0006] (2) Contact pressure calibration;

[0007] (3) Writing function and performance testing: including ink uniformity test and dynamic writing test;

[0008] (4) Durability test;

[0009] (5) Microstructure analysis and wear mechanism research;

[0010] (6) Extreme environment simulation test.

[0011] Furthermore, the indentation hardness test of step (1) is specifically as follows: fix the pen tip material to be tested on the test platform, set the spring pressure F of the indentation hardness tester to 1 to 10N, and Scratching the surface of the material. The force is 1 to 2N. After each scratch, a high-precision microscope is used to observe the width w, depth h and edge morphology of the scratch, record the destructive force data of the scratch, evaluate the hardness Hm of the pen tip, and analyze the hardness change trend of the material.

[0012] Furthermore, the friction coefficient test of step (1) is specifically as follows: fix the pen tip on the fixture of the pen tip friction coefficient tester, select the test paper, start the instrument, set the test speed v, make the pen tip contact the paper with the initial pressure N0 and perform a linear sliding test, and during the test, record the static friction coefficient of the contact surface between the pen tip and the paper in real time. and the coefficient of kinetic friction Data, each pen tip is tested 5 times in different positions and the average value is taken The friction coefficient test results of the pen tip are used to analyze the writing smoothness and glide of the pen tip based on the test results. The average friction coefficient is calculated as follows:

[0013] .

[0014] Furthermore, the contact pressure verification of step (2) is specifically as follows: using a high-precision pressure sensor to measure the actual contact pressure between the pen tip and the paper surface , according to the design requirements, adjust the contact pressure between the pen tip and the paper surface, use the dynamic pressure monitoring system to simulate the pressure changes in the actual writing process, and the pressure change range is set to , observe the response of the pen tip under different pressure fluctuations.

[0015] Furthermore, the ink uniformity test in step (3) is specifically as follows: simulate the writing action, and provide simulated ink to the pen tip through the microinjection device, with a flow rate of , Adjust according to the pen tip type and writing speed, observe the ink flowing out of the nib slit, and record the speed of ink flow. ,flow and uniformity , the calculation formula for uniformity is:

[0016] ,

[0017] in, is the ink outflow line width at the i-th measurement point, is the average width, and m is the number of measurement points.

[0018] Furthermore, the dynamic writing test of step (3) is specifically as follows: the pen tip is mounted on the writing component simulating the robotic arm, and the writing trajectory, speed and pressure are set; during the writing process, the pressure change ΔP of the pen tip is monitored in real time by a high-precision force sensor, and the softness E and feedback performance Fb of the pen tip at different angles θ and pressures are recorded by a high-speed camera, and the durability of the pen tip during long-term writing is observed. The softness can be measured by the degree of deformation of the pen tip under pressure, and its calculation formula is:

[0019] ,

[0020] in, is the deformation of the pen tip under pressure, This is the original length of the pen tip.

[0021] Furthermore, the durability test of step (4) is specifically as follows: simulating the long-term use environment of the pen tip, constructing a durability test platform, installing the pen tip on the writing actuator of the test platform, making it perform a cyclic writing action on a special wear-resistant writing material, setting writing parameters, conducting a comprehensive inspection of the pen tip every 1 hour, recording the inspection data, drawing a curve of the pen tip performance over time, analyzing the performance change trend of the pen tip during long-term use based on the curve, and evaluating the durability of the pen tip.

[0022] Furthermore, the microstructure analysis of step (5) is specifically as follows: the microstructure of the pen tip is observed using a scanning electron microscope, the pen tip to be tested is placed on the SEM sample stage, the position and angle of the pen tip are adjusted, a plurality of different magnifications are selected, the SEM image is recorded, and the characteristics of the microstructure of the pen tip are analyzed.

[0023] Furthermore, the wear mechanism detection in step (5) is specifically as follows: the pen tip is mounted on the manipulator of the friction life test device so that it contacts the fixed wear-resistant test disk, and the rotation speed, contact pressure and wear time parameters are set. The device drives the pen tip to draw a circle on the wear-resistant test disk; during the wear process, the pen tip is taken out every 1 hour and observed using an optical microscope and SEM, and the changes in the wear area are analyzed in combination with the energy spectrum to reveal the wear mechanism of the pen tip from a microscopic level.

[0024] Furthermore, step (6) is specifically as follows: extreme environment simulation test includes high temperature environment test, low temperature environment test and high humidity environment test;

[0025] High-temperature environment test: Build a high-temperature test chamber, place the pen tip inside, slowly raise the temperature to 50°C, maintain a constant temperature, start the simulated writing device to write, and observe the ink flow and surface structure changes of the pen tip every 30 minutes;

[0026] Low temperature environment test: Use a low temperature test chamber to reduce the temperature to -10℃, place the pen tip in the low temperature chamber, start the simulated writing device after the temperature stabilizes, and observe the ink flow smoothness and material embrittlement of the pen tip;

[0027] High humidity environment test: Set up a humidity control box and adjust the humidity to 85% RH. Place the pen tip in the humidity box for 24 hours. Then remove the pen tip and perform a writing test to check the connection between the pen tip and the capillary structure and the ink flow.

[0028] The present invention overcomes the limitations of existing methods for testing the performance of resin pen nibs, enabling a comprehensive and in-depth assessment of the nib's performance in complex environments and specific usage scenarios. This not only covers the nib's basic writing performance, but also its stability and durability under varying conditions of temperature, humidity, and pressure, ensuring the nib performs well in a variety of practical scenarios. DETAILED DESCRIPTION

[0029] In order to more intuitively and completely understand the technical solution of the present invention, a non-limiting description of the features is now provided as follows:

[0030] A method for detecting pen tip performance comprises the following steps:

[0031] (1) Material hardness and wear resistance testing: including indentation hardness test and friction coefficient test;

[0032] (2) Contact pressure calibration;

[0033] (3) Writing function and performance testing: including ink uniformity test and dynamic writing test;

[0034] (4) Durability test;

[0035] (5) Microstructure analysis and wear mechanism research;

[0036] (6) Extreme environment simulation test.

[0037] The specific steps of the indentation hardness test in step (1) are as follows: fix the pen tip material to be tested on the test platform, set the spring pressure F of the indentation hardness tester to 1 to 10N, and Scratching the surface of the material. The force is 1 to 2N. After each scratch, a high-precision microscope is used to observe the width w, depth h and edge morphology of the scratch, record the destructive force data of the scratch, evaluate the hardness Hm of the pen tip, and analyze the hardness change trend of the material. The friction coefficient test of step (1) is specifically as follows: fix the pen tip on the fixture of the pen tip friction coefficient tester, select the test paper, start the instrument, set the test speed v, v is 10-50mm / s, make the pen tip contact the paper with the initial pressure N0, N0 is 0.5-2.0N and perform a linear sliding test. During the test, the static friction coefficient of the contact surface between the pen tip and the paper is recorded in real time. and the coefficient of kinetic friction Data, each pen tip is tested 5 times in different positions and the average value is taken The friction coefficient test results of the pen tip are used to analyze the writing smoothness and glide of the pen tip based on the test results. The average friction coefficient is calculated as follows:

[0038] .

[0039] The indentation hardness test is used to measure the ability of the pen tip material to resist local plastic deformation, while the friction coefficient test is used to evaluate the friction characteristics between the pen tip and the writing medium. Together, the two test methods reflect the hardness and wear resistance of the pen tip material.

[0040] The contact pressure calibration of step (2) is as follows: Use a high-precision pressure sensor to measure the actual contact pressure between the pen tip and the paper surface. , according to the design requirements, adjust the contact pressure between the pen tip and the paper surface, use the dynamic pressure monitoring system to simulate the pressure changes in the actual writing process, and the pressure change range is set to Observe the pen tip's response to varying pressure fluctuations. If pressure is abnormal, check and adjust the pen tip structure. Contact pressure calibration ensures that the contact pressure between the pen tip and the paper meets design requirements, ensuring smooth writing.

[0041] The ink uniformity test of step (3) is as follows: simulate the writing action and provide simulated ink to the pen tip through the microinjection device at a flow rate of , Adjust according to the pen tip type and writing speed, observe the ink flowing out of the nib slit, and record the speed of ink flow. ,flow and uniformity , the calculation formula for uniformity is:

[0042] ,

[0043] in, is the ink outflow line width at the i-th measurement point, Where m is the average width, and m is the number of measurement points. If any ink flow anomalies are detected, targeted improvement measures can be proposed. The ink flow uniformity test focuses on the evenness of ink flow from the pen tip, which directly affects the thickness and clarity of the written lines.

[0044] The dynamic writing test in step (3) is specifically as follows: the pen tip is mounted on the writing component of the simulated robotic arm, and the writing trajectory, speed, and pressure are set; during the writing process, the pressure change ΔP exerted on the pen tip is monitored in real time by a high-precision force sensor, and the softness E and feedback performance Fb of the pen tip at different angles θ and pressures are recorded by a high-speed camera, and the durability of the pen tip during long-term writing is observed. The softness can be measured by the degree of deformation of the pen tip under pressure, and its calculation formula is:

[0045] ,

[0046] in, is the deformation of the pen tip under pressure, The dynamic writing test simulates the actual writing process and evaluates the performance and durability of the pen tip under different writing conditions.

[0047] The durability test of step (4) is specifically as follows: simulate the long-term use environment of the pen tip, build a durability test platform, install the pen tip on the writing actuator of the test platform, make it perform cyclic writing action on the special wear-resistant writing material, set the writing parameters, conduct a comprehensive inspection of the pen tip every 1 hour, record the inspection data, draw a curve of the pen tip performance over time, analyze the performance change trend of the pen tip during long-term use based on the curve, and evaluate the durability of the pen tip. If the pen tip fails prematurely during the durability test, the cause can be analyzed and an improvement plan can be proposed, and the durability test can be repeated. The durability evaluation of the pen tip can be measured by the cumulative writing length and the rate of change of the initial performance parameters of the pen tip (such as hardness, friction coefficient, etc.). The durability test evaluates the performance stability of the pen tip during long-term use.

[0048] The microstructure analysis of step (5) is specifically as follows: the pen tip is observed for microstructure using a scanning electron microscope, the pen tip to be tested is placed on the SEM sample stage, the pen tip position and angle are adjusted, multiple magnifications are selected, SEM images are recorded, and the characteristics of the pen tip microstructure are analyzed. The wear mechanism detection of step (5) is specifically as follows: the pen tip is mounted on the manipulator of the friction life test device so that it contacts the fixed wear test disk, the rotation speed, contact pressure and wear time parameters are set, and the device drives the pen tip to draw a circle on the wear test disk; during the wear process, the pen tip is taken out every 1 hour and observed using an optical microscope and SEM, and the changes in the wear area are analyzed by energy spectrum analysis to reveal the wear mechanism of the pen tip from a microscopic level. Microstructure analysis reveals the microstructural characteristics of the pen tip and provides a basis for material improvement; wear mechanism research provides an in-depth understanding of the wear process of the pen tip in actual use and optimizes the material formulation and structural design.

[0049] Step (6) is specifically as follows: extreme environment simulation test includes high temperature environment test, low temperature environment test and high humidity environment test;

[0050] High-temperature environment test: Build a high-temperature test chamber, place the pen tip inside, slowly raise the temperature to 50°C, maintain a constant temperature, start the simulated writing device to write, and observe the ink flow and surface structure changes of the pen tip every 30 minutes;

[0051] Low temperature environment test: Use a low temperature test chamber to reduce the temperature to -10℃, place the pen tip in the low temperature chamber, start the simulated writing device after the temperature stabilizes, and observe the ink flow smoothness and material embrittlement of the pen tip;

[0052] High humidity environment test: Set up a humidity control box and adjust the humidity to 85% RH. Place the pen tip in the humidity box for 24 hours. Then remove the pen tip and perform a writing test to check the connection between the pen tip and the capillary structure and the ink flow.

[0053] The extreme environment simulation test examines the performance of the pen tip in extreme environments such as high temperature, low temperature, and high humidity, and can provide targeted improvements to the pen tip material formula or structural design.

[0054] This invention overcomes the limitations of existing resin pen nib performance testing methods and provides a comprehensive and in-depth assessment of nib performance in complex environments and specific usage scenarios. This not only covers the nib's basic writing performance, but also its stability and durability under varying conditions of temperature, humidity, and pressure, ensuring the nib performs well in a variety of practical scenarios.

Claims

1. A pen tip performance detection method, characterized in that The following steps are involved: (1) Material hardness and wear resistance testing: including indentation hardness test and friction coefficient test; (2) Contact pressure calibration; (3) Writing function and performance testing: including ink uniformity test and dynamic writing test; (4) Durability test; (5) Microstructure analysis and wear mechanism research; (6) Extreme environment simulation test.

2. A pen tip performance detection method according to claim 1, characterized in that: The specific steps of the indentation hardness test in step (1) are as follows: fix the pen tip material to be tested on the test platform, set the spring pressure F of the indentation hardness tester to 1 to 10N, and Scratching the surface of the material. The force is 1 to 2N. After each scratch, a high-precision microscope is used to observe the width w, depth h and edge morphology of the scratch, record the destructive force data of the scratch, evaluate the hardness Hm of the pen tip, and analyze the hardness change trend of the material.

3. The pen tip performance detection method according to claim 2, characterized in that: The friction coefficient test of step (1) is as follows: fix the pen tip on the fixture of the pen tip friction coefficient tester, select the test paper, start the instrument, set the test speed v, make the pen tip contact the paper with the initial pressure N0 and perform a linear sliding test. During the test, record the static friction coefficient of the contact surface between the pen tip and the paper in real time. and the coefficient of kinetic friction Data, each pen tip is tested 5 times in different positions and the average value is taken The friction coefficient test results of the pen tip are used to analyze the writing smoothness and glide of the pen tip based on the test results. The average friction coefficient is calculated as follows: 。 4. The pen tip performance detection method according to claim 1, characterized in that: The contact pressure calibration of step (2) is as follows: Use a high-precision pressure sensor to measure the actual contact pressure between the pen tip and the paper surface. , according to the design requirements, adjust the contact pressure between the pen tip and the paper surface, use the dynamic pressure monitoring system to simulate the pressure changes in the actual writing process, and the pressure change range is set to , observe the response of the pen tip under different pressure fluctuations.

5. The pen tip performance detection method according to claim 1, characterized in that: The ink uniformity test of step (3) is as follows: simulate the writing action and provide simulated ink to the pen tip through the microinjection device at a flow rate of , Adjust according to the pen tip type and writing speed, observe the ink flowing out of the nib slit, and record the speed of ink flow. ,flow and uniformity , the calculation formula for uniformity is: ， in, is the ink outflow line width at the i-th measurement point, is the average width, and m is the number of measurement points.

6. The pen tip performance detection method according to claim 5, characterized in that: The dynamic writing test in step (3) is specifically as follows: the pen tip is mounted on the writing component of the simulated robotic arm, and the writing trajectory, speed, and pressure are set; during the writing process, the pressure change ΔP exerted on the pen tip is monitored in real time by a high-precision force sensor, and the softness E and feedback performance Fb of the pen tip at different angles θ and pressures are recorded by a high-speed camera, and the durability of the pen tip during long-term writing is observed. The softness can be measured by the degree of deformation of the pen tip under pressure, and its calculation formula is: ， in, is the deformation of the pen tip under pressure, This is the original length of the pen tip.

7. The pen tip performance detection method according to claim 1, characterized in that: The durability test of step (4) is specifically as follows: simulating the long-term use environment of the pen tip, building a durability test platform, installing the pen tip on the writing actuator of the test platform, making it perform a cyclic writing action on a special wear-resistant writing material, setting writing parameters, conducting a comprehensive inspection of the pen tip every 1 hour, recording the inspection data, drawing a curve of the pen tip performance over time, analyzing the performance change trend of the pen tip during long-term use based on the curve, and evaluating the durability of the pen tip.

8. The pen tip performance detection method according to claim 1, characterized in that: The microstructure analysis of step (5) is specifically as follows: the microstructure of the pen tip is observed using a scanning electron microscope, the pen tip to be tested is placed on the SEM sample stage, the position and angle of the pen tip are adjusted, a plurality of different magnifications are selected, the SEM image is recorded, and the characteristics of the microstructure of the pen tip are analyzed.

9. The pen tip performance detection method according to claim 8, characterized in that: The wear mechanism detection in step (5) is specifically as follows: the pen tip is mounted on the manipulator of the friction life test device so that it contacts the fixed wear-resistant test disk, and the rotation speed, contact pressure and wear time parameters are set. The device drives the pen tip to draw a circle on the wear-resistant test disk; during the wear process, the pen tip is taken out every 1 hour and observed using an optical microscope and SEM. The changes in the wear area are analyzed in combination with energy spectrum to reveal the wear mechanism of the pen tip from a microscopic level.

10. The pen tip performance detection method according to claim 1, characterized in that: Step (6) is specifically as follows: extreme environment simulation test includes high temperature environment test, low temperature environment test and high humidity environment test; High-temperature environment test: Build a high-temperature test chamber, place the pen tip inside, slowly raise the temperature to 50°C, maintain a constant temperature, start the simulated writing device to write, and observe the ink flow and surface structure changes of the pen tip every 30 minutes; Low temperature environment test: Use a low temperature test chamber to reduce the temperature to -10℃, place the pen tip in the low temperature chamber, start the simulated writing device after the temperature stabilizes, and observe the ink flow smoothness and material embrittlement of the pen tip; High humidity environment test: Set up a humidity control box and adjust the humidity to 85% RH. Place the pen tip in the humidity box for 24 hours. Then remove the pen tip and perform a writing test to check the connection between the pen tip and the capillary structure and the ink flow.

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