| Glass fiber is generally used as a reinforcing material in composite materials,which has a series of excellent properties such as low price,good corrosion resistance and high mechanical strength,and is widely used in various engineering fields.However,during the production of glass fiber products,glass fiber bundles will be subjected to various friction effects,resulting in product defects.After analyzing the current researches,it is found that the friction of the yarn during the fabric weaving process will be affected by many factors.If the friction of the glass fiber bundle during the weaving process can be analyzed systematically,the influence of various influencing factors on the friction performance can be obtained.It not only provides an objective reference for the analysis and improvement of the process parameters of glass fiber products,but also further improves the product quality and achieves the goal of energy saving and emission reduction.In this thesis,glass fiber bundles are used as the research object.By simulating the contact state of glass fibers during the weaving production process and combining tribological theory,experimental research has been conducted on the relationship between various factors and the friction properties between glass fiber bundles and between glass fiber bundles and metal friction rollers.The main research contents and conclusions of this article are as follows:(1)Several common friction performance test methods are introduced.After analyzing the contact state of glass fiber bundles in the weaving process,a glass fiber bundle friction performance test platform based on the hang on method is designed.Complete the construction of the entire test platform from both hardware and software aspects.The experimental performance of the test platform's important performance indicators,including the chuck clamping force test,the tension constant test,and the repeatability test,verified the reliability of the platform.(2)The friction performance test of glass fiber bundles was carried out by using the friction performance test platform based on the hang on method.A reasonable experimental scheme was designed through analysis.According to the experimental data,the influence of different parameters(linear density,pre-tension,load,friction rate,wrap angle,declination)on the friction performance was obtained,and the influence mechanism was analyzed with the theoretical model.Increasing the pre-tension will increase the contact area between the glass fiber bundles,so the friction coefficient and friction force increase.The coefficient of friction coefficient between the glass fiber bundles decreases with the increase of the load,which is consistent with the nonlinear friction law.The friction rate has no obvious influence on the friction coefficient.The reduction of the wrap angle causes the glass fiber filament to break and bend to affect the friction performance.The decrease in the offset angle leads to an increase in the contact area between the glass fiber bundles,and the filaments undergo recombination entanglement,increasing the friction between the glass fiber bundles.(3)The friction performance test bench based on the capstan method was used to conduct the friction performance experiment between the glass fiber bundle and the metal friction roller.The experimental results show that the friction coefficient and friction force between the glass fiber bundle and the metal friction roller increase with the increase of pre-tension.And the friction coefficient becomes stable after the tension increases to a certain value.The coefficient of friction varies with the change of friction rate.One possible reason is that the friction rate is related to the stick-slip phenomenon in the friction process.Under the same test conditions,the coefficient of friction of the three linear density glass fiber bundles is 1200 tex>4800 tex>2400 tex.(4)According to the law that the friction force increases with the increase of the pre-tension,an experimental scheme for the cross section between the glass fiber bundle and the metal friction roller is designed.The cross-section state under different tensions is experimentally studied Through microscopic observation,it is found that the cross section of the glass fiber bundle tends to be flat with the increase of the tension,and the cross-sectional area is reduced.It is proved that the fiber monofilament is rearranged during the process of increasing the tension.In addition,the increase in contact width indicates an increase in the actual contact area,and the adhesion friction theory can prove the increase in friction force. |
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