Real-time measuring method for bar tolerance

Abstract

The invention relates to a bar tolerance real-time measurement method, which relates to the technical field of bar tolerances, and comprises the following steps: S1, setting standard parameters; s2, bar data are collected, and the synthesis uncertainty uc is calculated; s3, if the bar data are valid, the step S4 is carried out; if the bar data are invalid, the step S9 is carried out; s4, calculating a density tolerance epsilon density; s5, if the density tolerance epsilon density is qualified, the step S6 is carried out; if the density tolerance epsilon density is not qualified, the step S9 is carried out; s6, calculating a correction tolerance epsilon (correction); step S7, if the correction tolerance epsilon is qualified, performing step S8; if the correction tolerance epsilon is not qualified, the step S9 is carried out; s8, if the bar is qualified, the step S2 is carried out; and step S9, alarming and correcting. The method has the effect of improving the bar quality judgment accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of bar tolerances, and in particular to a method for real-time measurement of bar tolerances. Background Art

[0002] Bars are basic raw materials widely used in many fields such as mechanical manufacturing, construction engineering, and automotive manufacturing. The tolerance accuracy of bars directly affects the quality and performance of subsequent products.

[0003] Currently, the measurement methods of bar tolerances are mainly divided into two categories: contact measurement and non-contact measurement. Although the contact measurement method has high accuracy, its measurement speed is slow, and it is easy to damage the surface of the bar. Non-contact measurement methods such as laser measurement and image measurement, although they have a fast measurement speed, are greatly affected by environmental factors, making it difficult to ensure the accuracy and reliability of bar tolerance results, and affecting the judgment of bar quality. Summary of the Invention

[0004] In order to improve the accuracy of bar quality judgment, the present application provides a method for real-time measurement of bar tolerances.

[0005] The method for real-time measurement of bar tolerances provided by the present application adopts the following technical solutions:

[0006] A method for real-time measurement of bar tolerances, comprising the following steps:

[0007] Step S1, set standard parameters;

[0008] Step S2, collect bar data and calculate the combined uncertainty u c ;

[0009] Step S3, if the bar data is valid, proceed to step S4; if the bar data is invalid, proceed to step S9;

[0010] Step S4, calculate the density tolerance ε 密 ;

[0011] Step S5, if the density tolerance ε 密 is qualified, proceed to step S6; if the density tolerance ε 密 is unqualified, proceed to step S9;

[0012] Step S6, calculate the corrected tolerance ε 修 ;

[0013] Step S7, if the corrected tolerance ε 修 is qualified, proceed to step S8; if the corrected tolerance ε 修 is unqualified, proceed to step S9;

[0014] Step S8, if the bar is qualified, proceed to step S2;

[0015] Step S9, give an alarm for correction.

[0016] Preferably, the step S1 includes the following steps: set the unit time T; input the initial length L0 of the bar; input the thermal expansion coefficient a1 of the bar; input the thermal expansion coefficient a2 of the quartz glass of the laser head of the laser rangefinder; input the maximum allowable error e of the laser rangefinder; input the damping coefficient K of the shock absorber; input the tolerance zone width W of the bar; input the nominal diameter D of the bar 标 ; input the material density ρ of the bar; input the volume expansion coefficient β of the bar.

[0017] Preferably, the step S2 includes the following steps:

[0018] Step S21, within the unit time T, the laser rangefinder collects the bar diameter and obtains n bar diameter values d i , where n ∈ N * , i ∈ N * , 0 ≤ i ≤ n; within the unit time T, the infrared thermal imager collects the surface temperature of the bar and obtains the maximum bar temperature value T max and the minimum bar temperature value T min ; within the unit time T, the vibration sensor obtains the amplitude A and the vibration frequency f; the high-precision finished product scale collects the bar mass M at the current moment; the laser rangefinder collects the actual length L of the bar at the current moment 实 ; within the unit time, the infrared thermal imager collects m bar temperature values t j , where m ∈ N * , j ∈ N * , 0 ≤ j ≤ m; the infrared thermal imager collects the current ambient temperature value T 环 ;

[0019] Step S22, calculate the average value of the bar diameter Calculate the first uncertainty Calculate the second uncertainty Calculate the temperature uncertainty Calculate the vibration uncertainty where 0 ≤ t ≤ T;

[0020] Step S23, calculate the combined uncertainty

[0021] Preferably, the step S3 includes the following steps: If then the bar parameters are valid and proceed to step S4; if then the bar parameters are invalid and proceed to step S9.

[0022] Preferably, the step S4 includes the following steps:

[0023] Step S41: Calculate the average temperature of the bar

[0024] Step S42: Calculate the theoretical diameter of the bar

[0025] Step S43: Calculate the density tolerance

[0026] Preferably, the step S5 includes the following steps: If then the density tolerance ε 密 is qualified and proceed to step S6; if then the density tolerance ε 密 is unqualified and proceed to step S9.

[0027] Preferably, the step S6 includes the following steps:

[0028] Step S61: The laser rangefinder collects the minor-axis diameter D of the same cross-section of the bar min ; the laser rangefinder collects the major-axis diameter D of the same cross-section of the bar max ;

[0029] Step S62: Calculate the correction coefficient

[0030] Step S63: If k≥0.98, then proceed to step S64; if k<0.98, then proceed to step S9;

[0031] Step S64: Calculate the equivalent diameter of the bar

[0032] Step S65: Calculate the correction tolerance ε 修 =|D 等 -D 标 |.

[0033] Preferably, the step S7 includes the following steps: If then the correction tolerance ε 修 is qualified and proceed to step S8; if then the correction tolerance ε 修 is unqualified and proceed to step S9.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. After obtaining the bar parameters, use the combined uncertainty to determine whether the obtained bar parameters are valid. If the obtained bar parameters are valid, then judge the bar tolerance. If the obtained bar parameters are invalid, trigger an alarm for corresponding error correction. While using the non-contact measurement method, screen out the bar parameters with large errors to improve the accuracy of the bar tolerance, thereby improving the accuracy of bar quality judgment;

[0036] 2. Calculate the theoretical diameter and average diameter of the bar using the bar parameters, obtain the density tolerance based on the deviation between the theoretical diameter and the average diameter of the bar, and judge whether the bar is qualified by comparing the density tolerance and the width of the tolerance zone;

[0037] 3. Calculate the equivalent diameter of the bar using the minor axis diameter and major axis diameter of the bar, obtain the correction tolerance based on the deviation between the equivalent diameter and the nominal diameter of the bar, and judge whether the bar is qualified by comparing the correction tolerance and the width of the tolerance zone;

[0038] 4. Use the density tolerance, correction tolerance, and correction coefficient to perform multi-dimensional judgment on the bar quality, improving the accuracy of bar quality judgment. Description of the Drawings

[0039] Figure 1 is a flowchart of a method for real-time measurement of bar tolerance in an embodiment of the present application.

[0040] Figure 2 is a flowchart for calculating the correction variance in an embodiment of the present application Detailed Embodiment

[0041] The following is a further detailed description of the present application in conjunction with the attached Figure 1-2 to further illustrate the present application in detail.

[0042] An embodiment of the present application discloses a method for real-time measurement of bar tolerance. Refer to Figure 1 and Figure 2 , including the following steps.

[0043] Step S1, set standard parameters, including the following steps.

[0044] Set the unit time T; input the width W of the tolerance zone of the bar; input the nominal diameter D of the bar 标 ; input the initial length L0 of the bar; input the density ρ of the bar material; input the volume expansion coefficient β of the bar; input the thermal expansion coefficient a1 of the bar; input the thermal expansion coefficient a2 of the quartz glass of the laser head of the laser rangefinder; input the maximum allowable error e of the laser rangefinder; input the damping coefficient K of the shock absorber.

[0045] Step S2, collect bar data and calculate the combined uncertainty u c, including the following steps.

[0046] Step S21: The high-precision finished product scale collects the mass M of the bar at the current moment; the laser rangefinder collects the actual length L of the bar at the current moment 实 ; within the unit time T, the laser rangefinder collects the diameters of the bar and obtains n bar diameter values d i , where n ∈ N * , i ∈ N * , 0 ≤ i ≤ n; within the unit time T, the infrared thermal imager collects the surface temperature of the bar and obtains the maximum bar temperature value T max and the minimum bar temperature value T min ; within the unit time, the infrared thermal imager collects m bar temperature values t j , where m ∈ N * , j ∈ N * , 0 ≤ j ≤ m; the infrared thermal imager collects the current ambient temperature value T 环 ; within the unit time T, the vibration sensor obtains the amplitude A and the vibration frequency f;

[0047] Step S22: Calculate the average value of the bar diameter Calculate the first uncertainty Calculate the second uncertainty Calculate the temperature uncertainty Calculate the vibration uncertainty where 0 ≤ t ≤ T;

[0048] Step S23: Calculate the combined uncertainty

[0049] Step S3: If then the bar parameters are valid and proceed to step S4; if then the bar parameters are invalid and proceed to step S9.

[0050] Step S4: Calculate the density tolerance ε 密 , including the following steps.

[0051] Step S41: Calculate the average value of the bar temperature

[0052] Step S42: Calculate the theoretical diameter of the bar

[0053] Step S43: Calculate the density tolerance

[0054] Step S5: If then the density tolerance ε 密 is qualified and proceed to step S6; if then the density tolerance ε 密 is unqualified and proceed to step S9.

[0055] Step S6. Calculate the correction tolerance ε 修 , including the following steps.

[0056] Step S61. The laser rangefinder collects the minor-axis diameter D of the same cross-section of the bar min ; the laser rangefinder collects the major-axis diameter D of the same cross-section of the bar max ;

[0057] Step S62. Calculate the correction coefficient

[0058] Step S63. If k≥0.98, then proceed to Step S64; if k<0.98, then proceed to Step S9;

[0059] Step S64. Calculate the equivalent diameter of the bar

[0060] Step S65. Calculate the correction tolerance ε 修 =|D 等 -D 标 |.

[0061] Step S7. If then the correction tolerance ε 修 is qualified and proceed to Step S8; if then the correction tolerance ε 修 is unqualified and proceed to Step S9.

[0062] Step S8. The bar is qualified, proceed to Step S2;

[0063] Step S9. Alarm for correction.

[0064] The implementation principle of a real-time bar tolerance measurement method in an embodiment of the present application is as follows: When the bar parameters are collected, first calculate the combined uncertainty, and use the combined uncertainty to determine whether the obtained bar parameters are valid. If the collected bar parameters are valid, the errors of these data are small, and the bar tolerance is calculated using these valid data. If the collected bar parameters are invalid, the errors of these data are large, thereby triggering an alarm and performing corresponding error correction. During the process of obtaining bar parameters using a non-contact measurement method, not only is the risk of damage to the bar surface reduced, but also the bar parameters with large errors are screened out. When valid bar parameters are obtained, density tolerance, correction tolerance, and correction coefficient are obtained. The bar quality is judged from multiple dimensions using density tolerance, correction tolerance, and correction coefficient, improving the accuracy of bar quality judgment.

[0065] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A real-time measurement method for the tolerance of bars, characterized in that: It includes the following steps: Step S1, set standard parameters; Step S2: Collect bar data and calculate the combined uncertainty u c ; Step S3, if the bar data is valid, go to step S4; if the bar data is invalid, go to step S9; Step S4, calculate the density tolerance ε 密 ; Step S5. If the density tolerance ε 密 is qualified, proceed to Step S6; if the density tolerance ε 密 is unqualified, proceed to Step S9; Step S6, calculate the correction tolerance ε 修 ; Step S7: If the correction tolerance ε 修 is qualified, proceed to step S8; if the correction tolerance ε 修 is unqualified, proceed to step S9; Step S8, if the bar is qualified, go to step S2; Step S9, give an alarm for correction.

2. The real-time measurement method for the tolerance of bars according to claim 1, characterized in that: The step S1 includes the following steps: setting the unit time T; inputting the initial length L0 of the bar; inputting the thermal expansion coefficient a1 of the bar; inputting the thermal expansion coefficient a2 of the quartz glass of the laser head of the laser rangefinder; inputting the maximum allowable error e of the laser rangefinder; inputting the shock absorber attenuation coefficient K; inputting the tolerance zone width W of the bar; inputting the nominal diameter D of the bar 标 ; inputting the material density ρ of the bar; inputting the volume expansion coefficient β of the bar.

3. A real-time measurement method for the tolerance of bars according to claim 2, characterized in that: The said step S2 includes the following steps: Step S21: Within the unit time T, the laser rangefinder collects the diameters of the bars, obtaining n bar diameter values d i , where n ∈ N * , i ∈ N * , 0 ≤ i ≤ n; within the unit time T, the infrared thermal imager collects the surface temperature of the bars, obtaining the maximum bar temperature value T max and the minimum bar temperature value T min ; within the unit time T, the vibration sensor obtains the amplitude A and the vibration frequency f; the high-precision finished product scale collects the bar mass M at the current moment; the laser rangefinder collects the actual length L of the bar at the current moment 实 ; within the unit time, the infrared thermal imager collects m bar temperature values t j , where m ∈ N * , j ∈ N * , 0 ≤ j ≤ m; the infrared thermal imager collects the current ambient temperature value T 环 ; Step S22, calculate the average value of the bar diameter Calculate the first uncertainty Calculate the second uncertainty Calculate the temperature uncertainty Calculate the vibration uncertainty where 0 ≤ t ≤ T; Step S23, calculate the combined uncertainty 4. A real-time measurement method for the tolerance of bars according to claim 3, characterized in that: The step S3 includes the following steps: If then the bar parameters are valid and proceed to step S4; if then the bar parameters are invalid and proceed to step S9.

5. A real-time measurement method for the tolerance of bars according to claim 3, characterized in that: The said step S4 includes the following steps: Step S41, calculate the average temperature of the bar Step S42, calculate the theoretical diameter of the bar Step S43, calculate the density tolerance 6. A real-time measurement method for the tolerance of bars according to claim 5, characterized in that: The step S5 includes the following steps: If then the density tolerance ε 密 is qualified, proceed to step S6; if then the density tolerance ε 密 is unqualified, proceed to step S9.

7. A real-time measurement method for the tolerance of bars according to claim 3, characterized in that: The said step S6 includes the following steps: Step S61: The laser rangefinder collects the minor axis diameter D of the same cross-section of the bar min ; The laser rangefinder collects the major axis diameter D of the same cross-section of the bar max ; Step S62, calculate the correction coefficient Step S63, if k≥0.98, then go to step S64; if k<0.98, then go to step S9; Step S64, calculate the equivalent diameter of the bar Step S65, calculate the correction tolerance ε 修 = |D 等 - D 标 |.

8. A real-time measuring method for the tolerance of a bar, as claimed in claim 7, wherein: The step S7 includes the following steps: If then correct the tolerance ε 修 If it is qualified, proceed to step S8; if then correct the tolerance ε 修 If it is unqualified, proceed to step S9.

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