- 學位論文
剎車線塑膠材質磨潤分析
Tribology Analysis on Break Line of Plastic Material
摘要
當兩機械元件有先對運動時，並定受到外力並且相互接觸摩擦，這時候必須考慮面或線之接觸性質，如磨潤、磨損與接觸方式等現象。為了模擬兩塑膠接觸的運動情況，本實驗將透過並聯式磨潤實驗機來進行實驗分析。 本實驗的研究目的是分析兩種塑膠元件在接觸時，以不同的速度，正向力，加上相同的磨潤時間的參數，對於不同的塑膠材質所產生線接觸的磨潤分析，再藉由分析，探討摩擦係數及磨耗前後的表面粗糙度。 本論文主要是來探討PP、POM、PE塑膠與塑膠材料進行磨潤試驗之研究分析，分析在相同的磨潤時間，不同的轉速、正向力，所得到之實驗數據，在求得摩擦係數F＝μFn(F=摩擦力 μ=摩擦係數 Fn=正向力)，來瞭解磨潤後之影響。 本實驗出的摩擦係數和磨耗時間曲線中，可以清楚的了解何種塑膠材料在何種磨潤條件狀況下，可以得到最大以及最小的摩擦係數，實驗後發現： 所有條件則在正向力40(N)轉速58(RPM)上試片為PP下試片為POM摩擦係數為最低。 但是上試片PP下試片POM在正向力40(N)轉速58(RPM)時，摩擦係數最小值為0.00531(μ)，可是在正向力60(N)轉速58(RPM)時候摩擦係數卻達到0.37014(μ)，最高到最低可相差到0.24192。 而上試片PE下試片POM在正向力40(N)轉速80(RPM)時，摩擦係數最小值為0.09881(μ)，在正向力50轉速80時摩擦係數0.20289(μ)為最大值，最高到最低卻只有相差0.10408(μ)。 研究後發現，上片PP下片POM在正向力40(N)轉速80(RPM)的情況下，研磨後比研磨前的平面粗糙度來的最佳，則上片POM下片PE無論在何種條件下研磨後的平面粗操度都比未研磨時來的高。我們發現到磨擦係數越低，平面粗糙度研磨前與研磨後的平面粗糙度差異越小。 而表面粗糙度並非正向力越小，粗糙度越佳。
並列摘要
When there is relative motion between two mechanical elements, and is scheduled by external forces and frictional contact with each other, at this point, we must to consider the nature of the contact surfaces or lines, such as tribology, wear, and contact methods and so on. In order to simulate the movement of the contact between two plastics, this test analysis would be carried out through parallel tribological test machine. The purpose of this test was to analyze the contact between two plastics, at different velocities、normal forces, and coupled with the same tribology time parameters for tribological analysis of different plastic materials that generate line contact. By means of the analysis, we could further explored the friction coefficient and the surface roughness before and after the wear. This thesis was to investigate the tribological test research analysis between plastic PP, POM, PE and other plastic materials, the test result was obtained under the same tribology time, and at different rotation speed, normal force. Next, calculated the friction coefficient which can be transferred into formula, F = μFn (F = friction μ = coefficient of friction Fn = normal force), to understand the impact of tribological after. We could clearly understood what kind of plastic materials in tribological conditions under which conditions could then receive the maximum and minimum friction coefficient through the coefficient of friction and wear-time curve generated in this test and, afterward , finding out that: We at last got the result of the friction index being the lowest when the conditions were controlled under 40N and 58rpm, with upper test fragment using PP as testing material and lower test fragment using POM as testing material. However, in the condition of upper test fragment using PP as testing material and lower test fragment using POM as testing material with 40N and 58rpm, the minimum value of the friction coefficient was 0.00531; in another situation, with 60N and 58rpm, the friction coefficient had reached 0.37014. The numerical difference between the conditions was only 0.24192. In the next condition of upper test fragment using PE as testing material and lower test fragment using POM as testing material with 40N and 80rpm, the minimum value of the friction coefficient was 0.09881; but, with 60N and 58rpm, the friction coefficient had reached 0.37014. The numerical difference between the maximum and minimum value of the friction coefficient only went up to 0.10408. After the research, we found that in the situation of upper test fragment using PP as testing material and lower test fragment using POM as testing material with 40N and 80rpm, the plane roughness was better when being grinded; however, in the situation of upper test fragment using PP as testing material and lower test fragment using POM as testing material, the plane roughness in no matter under what conditions of normal force and rotational speed, was better when being grinded. In conclusion of the above, the lower the friction coefficient, the less the plane roughness difference before and after grinding. So, based on the above, the surface roughness was not proportion to normal forces; which means the surface roughness won’t become better when normal forces get smaller.