Elastic material finished product performance test control method and test machine

Abstract

The invention belongs to the technical field of elastic material production, and discloses an elastic material finished product performance test control method and a test machine.The elastic material finished product performance test control method comprises the following steps of 1, test sample piece manufacturing, 2, sample piece testing and 3, material judging and grouping. A stepping motor is fixedly installed at the top of the base through a motor base, the end of an output shaft of the stepping motor and one end of a screw are fixedly installed, the other end of the screw is in threaded connection with one side of a sliding block, the sliding block is slidably connected to the top of a sliding rail, and the sliding rail and the base are fixedly installed. According to the invention, accurate grouping can be realized by combining innovative testing, grading and control methods with the design of a testing machine; the stability and consistency of test results can be effectively guaranteed, and the test results accurately correspond to product characteristics; the test method is simple and fast, is integrated in production process control and can be used for repeated detection.

Description

Technical Field

[0001] The invention belongs to the technical field of elastic material production, and in particular relates to a method for controlling the performance of an elastic material finished product and a testing machine. Background Art

[0002] At present, in the field of elastic material production, due to the natural volatility of the characteristics of elastic materials, it is extremely difficult to master the ratio of raw materials during the production process. For example, the usual hardness manufacturing tolerance in the industry is about + / -3, the accuracy cannot meet the requirements of quality control, and unqualified inspection results will also cause the product to be scrapped. For products with elastic property requirements such as shock absorbers, sealing rings, etc., it is necessary to prepare samples and test the materials to be produced before production to detect whether there is any deviation in the ratio of raw materials and predict whether the performance can meet the expected requirements. However, the existing detection methods have the following defects 1. The defects of elastomer hardness test are: low precision and affected by the process, which belongs to post-test / control; 2. The defects of the tensile strength test of elastomers are: insufficient stability, large differences in test results between different batches; destructive testing, non-repeatable; not directly related to the elastic properties of the product; 3. Material modulus testing has the following defects: the testing process is complicated, expensive, and time-consuming; it requires expensive special equipment, complex sample preparation technology, and professional knowledge to operate and process the test results. It cannot be used for production process control where materials are frequently changed and timely judgment is required.

[0003] Based on the above problems, it is necessary to develop a form of detection method and equipment to solve them. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention aims to provide a method for measuring and controlling the performance of a finished elastic material.

[0005] The technical solution adopted by the present invention is: A method for measuring and controlling the performance of a finished elastic material product comprises the following steps: Step 1: Sample preparation Use the material to be tested to make standard test samples, and use transfer molds specifically for the test samples. Make multiple test samples per mold. Step 2: Sample testing Use the elastic material ring testing machine to test the sample, set the tensile test sample according to the program, and read its displacement value and required tensile force value at the same time. Take the force value of two pre-defined points through the program, and take their difference as the test result value of this sample; Each group tests multiple test samples, and the program calculates and displays the final average value of multiple groups of result values, which is defined as the OST value. The preset standard value and the set CV value are used as references to check the test results. Step 3: Determination and grouping of materials The OST values ​​of a group of test samples are used to determine the material properties to be produced and to group the materials, thereby predicting and determining the characteristics of the final product made of this material. Different grades are divided by pre-establishing material grouping definitions.

[0006] Furthermore, in step 1, the test samples are arranged in a circle in the mold, and the pressure must be consistent, and the flow process of transferring and filling the test samples must be consistent.

[0007] Furthermore, in step 1, the test sample must be cooled to room temperature for two hours before testing.

[0008] Furthermore, the test sample has a circular ring structure, and the process parameters for sample preparation are consistent with the parameters for manufacturing the product.

[0009] A testing machine for an elastic material ring comprises a base, a stepper motor is fixedly mounted on the top of the base through a motor base, an output shaft end of the stepper motor is fixedly mounted on one end of a screw rod, the other end of the screw rod is threadedly connected to one side of a slider, the slider is slidably connected to the top of a slide rail, the slide rail is fixedly mounted on the base, a side of the slider opposite to the screw rod is fixedly mounted on one end of a pull rod, the other end of the pull rod is fixedly mounted on one end of a tension sensor, the other end of the tension sensor is fixedly mounted on one end of a connecting rod, the other end of the connecting rod is fixedly connected to the displacement end of a tensioning mechanism, a displacement sensor is provided on one side of the tensioning mechanism, the test specimen is tensioned by being placed in the testing machine for an elastic material ring, and its displacement value and tension value are detected by the tension sensor and the displacement sensor.

[0010] Furthermore, the supporting mechanism includes a sliding seat and a fixed seat, the fixed seat is fixedly installed on the top of the base, the sliding seat is slidably connected to the top of the slide rail, and is driven to approach or move away from the fixed seat by a connecting rod.

[0011] Furthermore, a support block is disposed on the top of the sliding seat and the fixed seat, and the two support blocks form a cylindrical structure, and the test sample is sleeved on the outside of the cylindrical structure.

[0012] Furthermore, a detection plate is fixedly mounted on one side of the sliding seat corresponding to the displacement sensor, and the detection plate is aligned with the displacement sensor.

[0013] Furthermore, a processor, a memory and a display are also arranged on the top of the base.

[0014] Furthermore, the stepper motor, the tension sensor, the displacement sensor, the memory and the display are all electrically connected to the processor via wires.

[0015] The beneficial effects of the present invention are: The present invention can accurately group products through innovative testing, grading and control methods combined with the design of the testing machine; it can effectively ensure the stability and consistency of the test results and their precise correspondence with product characteristics; the testing method is simple and fast, integrated into the production process control and can be tested repeatedly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the method of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the elastic material testing machine.

[0017] 1. Base; 2. Stepper motor; 3. Motor base; 4. Screw; 5. Slide rail; 6. Slider; 7. Pull rod; 8. Tension sensor; 9. Support mechanism; 91. Sliding seat; 92. Fixed seat; 93. Support block; 94. Detection plate; 10. Connecting rod; 11. Displacement sensor; 12. Memory; 13. Processor 14. Test sample. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] Example 1 like Figure 1 As shown, a method for measuring and controlling the performance of a finished elastic material product comprises the following steps: First, the first step is to make a standard test sample with the material to be tested, and make it through a special transfer mold. Each mold makes 5-8 pieces. The test samples are arranged in a circle in the mold to ensure consistent pressure, consistent flow process of material transfer and filling, and consistent process parameters of sample preparation (such as temperature, pressure) with the parameters of the product. Step 2: After the test sample has cooled to room temperature for 2 hours, use an elastic material ring tester to test softer elastic materials such as rubber or harder materials such as polyurethane.

[0020] The test sample is placed in the test machine and the test is performed. The test machine stretches the sample according to the program setting and reads the displacement and force values ​​at the same time. The processor 13 program takes the difference between the force values ​​at two pre-set displacements from small to large as the final result of the test of this sample.

[0021] Taking the T1 value of material A in Table 1 below as an example, the force of material A at the first point is 13N, and the force at the second point is 89N. The difference between them, 76, is taken as the final result of the test.

[0022] Each group tests 5-8 samples, and the processor 13 program automatically calculates and displays the average value of the final result, which is defined as the OST value, and also gives the degree of deviation, i.e., the CV value, as a reference; CV (Coefficient of Variation) is a relative indicator used to measure the degree of dispersion of data. It is often used to compare the degree of variation of different data sets or different units of measurement because the CV value is dimensionless, that is, it eliminates the influence of data size or unit. The calculation formula of CV value is the ratio of standard deviation to mean, expressed as a percentage.

[0023] Table 1 below shows the test results of samples of different grades of a certain material. The first column is the material number, and T1-T5 are the test results of each sample: The average value of a group of tests is taken as the test result of this material, that is, the OST value, which is used to determine the grade and grouping. The purpose of taking the average value is that the properties of elastic materials are naturally volatile, and the average calculation can exclude extreme values ​​and be closer to the true value.

[0024] The CV value is the deviation, defined as the standard deviation compared to the mean, and is used to measure the degree of deviation of the data.

[0025] For example, when the CV value exceeds 5%, it means that there is a large difference between the samples and retesting is necessary. The purpose of doing this calculation is to avoid errors in actual operation. Because the tested samples cannot be distinguished by appearance, mixing similar materials will cause the test results to deviate from the true value. The early warning can remind the tester to recheck the samples and results.

[0026] Table 1

[0027] The test results of the four materials in the table are 7, 158, 313 and 461 respectively. The test results can be used to determine whether the batch of materials is qualified or how to make further adjustments. The deviation ranges from 0.8% to 2.1%, which is within the appropriate range.

[0028] Step 3: Material determination and grouping: The test results of a material (OST value averaged over a group of tests) are used to determine the performance of the material, group the materials, and predict and determine the characteristics of the final product made of the material.

[0029] The material grouping definition can be pre-defined to divide different grades. For example, in order to control the stiffness of the final product to fluctuate within the range of + / -5%, the OST value grouping is defined as follows: Table 2

[0030] For example, the materials A, B, C, and D tested belong to the 4th, 12th, 19th, and 23rd groups (brands) respectively. The stiffness characteristics of the finished products made from the same group of materials fluctuate within + / -5%. This method can distinguish about 30 brands, thereby more accurately controlling product performance.

[0031] Under the same conditions, if hardness is used as a control parameter, it is impossible to accurately distinguish multiple groups of grades. The Shore hardness range of commonly used rubber materials is about 30 to 75, and the usual manufacturing tolerance in the industry is about + / -3, which can only divide the materials into about 7-8 groups.

[0032] In addition, the OST value target and range of the material can be determined based on product development and test results, and used as the target of production control.

[0033] For example, the OST value of a material that meets the target stiffness of a product is 110. To ensure that the stiffness of each batch of products produced varies within 10%, the OST value of the material should be between 99 and 121. If the test value is out of range, the formula should be adjusted and the material should be re-prepared to avoid waste caused by producing unqualified products.

[0034] In cases where accurate control of material properties is required, such as in the manufacture of shock absorbers, seals and other products, this method and testing machine can ensure that the product properties meet the requirements, and the accuracy is higher than the usual measurement and control methods.

[0035] Through the testing, grading and control methods of this method, accurate grouping can be achieved; the test results can be guaranteed to be stable and consistent and accurately correspond to product characteristics; the test method is simple and fast, integrated into the production process control and can be tested repeatedly.

[0036] Embodiment 2: like Figure 2As shown, an elastic material ring testing machine includes a base 1, a stepper motor 2 is fixedly installed on the top of the base 1 through a motor base 3, the output shaft end of the stepper motor 2 is fixedly installed on one end of a screw rod 4, the other end of the screw rod 4 is threadedly connected to one side of a slider 6, the slider 6 is slidably connected to the top of a slide rail 5, the slide rail 5 is fixedly installed on the base 1, the side of the slider 6 opposite to the screw rod 4 is fixedly installed on one end of a pull rod 7, the other end of the pull rod 7 is fixedly installed on one end of a tension sensor 8, the other end of the tension sensor 8 is fixedly installed on one end of a connecting rod 10, the other end of the connecting rod 10 is fixedly connected to the displacement end of a tensioning mechanism 9, a displacement sensor 11 is provided on one side of the tensioning mechanism 9, the test sample is tensioned by being placed in the elastic material ring testing machine, and its displacement value and tension value are detected by the tension sensor 8 and the displacement sensor 11.

[0037] Furthermore, the supporting mechanism 9 includes a sliding seat 91 and a fixed seat 92 . The fixed seat 92 is fixedly installed on the top of the base 1 . The sliding seat 91 is slidably connected to the top of the slide rail 5 and is driven to approach or move away from the fixed seat 92 through the connecting rod 10 .

[0038] Furthermore, a support block 93 is disposed on the top of the sliding seat 91 and the fixed seat 92 . The two support blocks 93 form a cylindrical structure, and the test sample is sleeved on the outside of the cylindrical structure.

[0039] Furthermore, a detection plate 94 is fixedly mounted on one side of the sliding seat 91 corresponding to the displacement sensor 11 , and the detection plate 94 is aligned with the displacement sensor 11 .

[0040] Furthermore, a processor 13, a memory 12 and a display are also disposed on the top of the base 1.

[0041] Furthermore, the stepper motor 2 , the tension sensor 8 , the displacement sensor 11 , the memory 12 and the display are all electrically connected to the processor 13 via wires.

[0042] Specifically, the working principle of this testing machine is: the screw rod 4 is driven to rotate by the stepper motor 2, thereby driving the slider 6 slidingly connected to the slide rail 5 to move linearly, thereby driving the pull rod 7, the tension sensor 8 and the connecting rod 10 to pull the sliding seat 91 of the supporting mechanism 9 to move, thereby separating the test sample arranged on the outside thereof through two groups of supporting blocks 93, causing it to deform; at the same time, the displacement sensor 11 detects the displacement value of the detection plate 94 driven by the sliding seat 91, and the tension value generated in the process is collected by the tension sensor 8, and finally calculated by the processor 13, and transferred to the memory 12 for storage, and finally displayed through the display.

[0043] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A method for measuring and controlling the performance of a finished elastic material, characterized in that: The following steps are involved: Step S1: Sample preparation Use the material to be tested to make standard test samples, and use transfer molds specifically for the test samples. Make multiple test samples per mold. Step S2: Sample testing Use the elastic material ring testing machine to test the sample, set the tensile test sample according to the program, read its displacement value and tension value at the same time, and use the program to take the difference between the two pre-defined points as the test result value of this sample; Each group tests multiple test samples, and the program calculates and displays the final average value of multiple groups of result values, which is defined as the OST value. The preset standard value and the set CV value are used as references to check the test results. Step S3: Determination and grouping of materials The OST values ​​of a group of test samples are used to determine the material properties to be produced and to group the materials, thereby predicting and determining the characteristics of the final product made of this material. Different grades are divided by pre-establishing material grouping definitions.

2. A method for measuring and controlling the performance of a finished elastic material according to claim 1, characterized in that: In step S1, the test samples are arranged in a circle in the mold, and the pressure must be consistent, and the flow process of transferring and filling the test samples must be consistent.

3. The method for measuring and controlling the performance of a finished elastic material product according to claim 1, characterized in that: In step S1, the test sample must be cooled to room temperature for two hours before testing.

4. A method for measuring and controlling the performance of a finished elastic material according to claim 2, characterized in that: The test sample has a circular ring structure, and the process parameters for sample preparation are consistent with the parameters for manufacturing the product.

5. An elastic material ring testing machine, applied to the elastic material finished product performance measurement and control method according to any one of claims 1 to 4, characterized in that: It includes a base, a stepper motor is fixedly installed on the top of the base through a motor base, the output shaft end of the stepper motor is fixedly installed on one end of a screw rod, the other end of the screw rod is threadedly connected to one side of a slider, the slider is slidably connected to the top of a slide rail, the slide rail is fixedly installed on the base, the side of the slider opposite to the screw rod is fixedly installed on one end of a pull rod, the other end of the pull rod is fixedly installed on one end of a tension sensor, the other end of the tension sensor is fixedly installed on one end of a connecting rod, the other end of the connecting rod is fixedly connected to the displacement end of a bracing mechanism, a displacement sensor is provided on one side of the bracing mechanism, the test sample is stretched by being placed in the elastic material ring testing machine, and its displacement value and tension value are detected by the tension sensor and the displacement sensor.

6. The elastic material ring testing machine according to claim 5, characterized in that: The supporting mechanism comprises a sliding seat and a fixed seat, wherein the fixed seat is fixedly mounted on the top of the base, and the sliding seat is slidably connected to the top of the slide rail and is driven to approach or move away from the fixed seat by a connecting rod.

7. The elastic material ring testing machine according to claim 6, characterized in that: The tops of the sliding seat and the fixed seat are both provided with support blocks, the two support blocks form a cylindrical structure, and the test sample is sleeved on the outside of the cylindrical structure.

8. The elastic material ring testing machine according to claim 7, characterized in that: A detection plate is fixedly mounted on one side of the sliding seat corresponding to the displacement sensor, and the detection plate is aligned with the displacement sensor.

9. The elastic material ring testing machine according to claim 8, characterized in that: A processor, a memory and a display are also arranged on the top of the base.

10. The elastic material ring testing machine according to claim 9, characterized in that: The stepping motor, the tension sensor, the displacement sensor, the memory and the display are all electrically connected to the processor through wires.

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