冷压及热压烧结钻机刹车片性能的比较

发布时间：2018-02-12 23:44

  本文关键词： 钻机刹车片 粉末冶金 冷压烧结法 热压烧结法　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：随着浅部矿产资源的枯竭,地质找矿任务已由浅部转向深部。深孔条件下,起下钻时钻杆和钻具的重量将大大增加,为确保钻进效率和施工人员的安全,对钻机卷扬的刹车材料提出了更高的要求。粉末冶金摩擦材料具有摩擦系数高而稳定、耐高温高压、耐磨损和工作平稳可靠等优点,非常适合做为深孔钻机卷扬的刹车材料。粉末冶金刹车片的烧结方法大致可分为冷压烧结法和热压烧结法这两种类型。冷压烧结与热压烧结的最大区别是烧结前是否对粉末体进行高压(一般200MPa以上)压制。为比较这两种烧结方法的优劣,本文同时采用冷压及热压烧结法烧制了刹车片试样,并对其各项性能进行了测试。首先,论文确定了冷压及热压烧结刹车片试样的制造工艺,针对压制压力对冷压刹车片性能的影响进行了研究。通过对250MPa,300MPa,450MPa,600MPa这四个压力下压制烧结的冷压刹车片试样的性能比较研究,发现:压制压力在300MPa-450MPa范围内的冷压刹车片性能更优。之后,采用最佳压制压力范围内的压力(300MPa)压制烧结了2个冷压刹车片试样,同时烧制了2个热压刹车片试样,并对这些冷压及热压刹车片试样的物理力学性能、摩擦磨损性能和微观形貌进行了测试及观察。通过对冷压及热压刹车片试样的性能测试结果进行了比较研究,得出:(1)冷压烧结刹车片在硬度和摩擦系数上与热压烧结刹车片性能相近;(2)冷压烧结刹车片在密度、抗压强度及摩擦系数的稳定性上比热压烧结刹车片性能更好;(3)在高速下,热压烧结刹车片的磨损量要比冷压烧结刹车片少。最终结论是:冷压烧结刹车片的性能与CRCC(中铁检验认证中心)规定的摩擦材料性能标准相近,即冷压烧结法更适合重载刹车片的制造。其烧结制造参数为:冷压压制压力300MPa,烧结压力3Mpa,烧结温度950℃,升温速率50℃/min,保温时间5分钟。
[Abstract]:With the depletion of shallow mineral resources, the geological prospecting task has shifted from shallow to deep. Under the condition of deep hole, the weight of drill pipe and drill pipe will be greatly increased, in order to ensure drilling efficiency and safety of construction personnel. Higher requirements are put forward for brake materials rolled up by drilling rigs. Powder metallurgy friction materials have the advantages of high friction coefficient and stability, high temperature and high pressure resistance, wear resistance and smooth and reliable operation, etc. The sintering method of powder metallurgy brake plate can be divided into cold pressing sintering method and hot pressing sintering method. The biggest difference between cold pressing sintering and hot pressing sintering is before sintering. Whether the powder is pressed at high pressure (generally above 200 MPA). In order to compare the advantages and disadvantages of the two sintering methods, At the same time, the brake plate samples were sintered by cold pressing and hot pressing sintering, and their properties were tested. Firstly, the manufacturing process of cold pressing and hot pressing sintered brake brake specimens was determined. The effect of pressing pressure on the properties of cold pressed brake discs was studied. It is found that the performance of the cold-pressed brake brake is better when the pressing pressure is in the range of 300MPa-450 MPA. After that, two specimens of the cold-pressed brake plate are pressed and sintered by using the pressure of 300MPa in the optimum pressure range, and two samples of the hot-pressed brake plate are fired. The physical and mechanical properties, friction and wear properties and micro-morphology of these cold pressed and hot pressed brake pad specimens were tested and observed. The results show that the hardness and friction coefficient of the cold-pressed sintered brake are similar to those of the hot-pressed sintered brake.) the density, compressive strength and friction coefficient of the cold-pressed sintered brake are better than those of the hot-pressed sintered brake at high speed. The wear of hot press sintered brake is less than that of cold pressed sintered brake. The final conclusion is that the performance of cold pressed sintered brake is similar to that of friction material stipulated by CRCC (China Railway Inspection and Certification Center). The sintering parameters are as follows: pressing pressure 300 MPA, sintering pressure 3 MPA, sintering temperature 950 鈩，

本文编号：1506836