本文關(guān)鍵詞： 鉆機(jī)剎車(chē)片 粉末冶金 冷壓燒結(jié)法 熱壓燒結(jié)法　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著淺部礦產(chǎn)資源的枯竭,地質(zhì)找礦任務(wù)已由淺部轉(zhuǎn)向深部。深孔條件下,起下鉆時(shí)鉆桿和鉆具的重量將大大增加,為確保鉆進(jìn)效率和施工人員的安全,對(duì)鉆機(jī)卷?yè)P(yáng)的剎車(chē)材料提出了更高的要求。粉末冶金摩擦材料具有摩擦系數(shù)高而穩(wěn)定、耐高溫高壓、耐磨損和工作平穩(wěn)可靠等優(yōu)點(diǎn),非常適合做為深孔鉆機(jī)卷?yè)P(yáng)的剎車(chē)材料。粉末冶金剎車(chē)片的燒結(jié)方法大致可分為冷壓燒結(jié)法和熱壓燒結(jié)法這兩種類(lèi)型。冷壓燒結(jié)與熱壓燒結(jié)的最大區(qū)別是燒結(jié)前是否對(duì)粉末體進(jìn)行高壓(一般200MPa以上)壓制。為比較這兩種燒結(jié)方法的優(yōu)劣,本文同時(shí)采用冷壓及熱壓燒結(jié)法燒制了剎車(chē)片試樣,并對(duì)其各項(xiàng)性能進(jìn)行了測(cè)試。首先,論文確定了冷壓及熱壓燒結(jié)剎車(chē)片試樣的制造工藝,針對(duì)壓制壓力對(duì)冷壓剎車(chē)片性能的影響進(jìn)行了研究。通過(guò)對(duì)250MPa,300MPa,450MPa,600MPa這四個(gè)壓力下壓制燒結(jié)的冷壓剎車(chē)片試樣的性能比較研究,發(fā)現(xiàn):壓制壓力在300MPa-450MPa范圍內(nèi)的冷壓剎車(chē)片性能更優(yōu)。之后,采用最佳壓制壓力范圍內(nèi)的壓力(300MPa)壓制燒結(jié)了2個(gè)冷壓剎車(chē)片試樣,同時(shí)燒制了2個(gè)熱壓剎車(chē)片試樣,并對(duì)這些冷壓及熱壓剎車(chē)片試樣的物理力學(xué)性能、摩擦磨損性能和微觀形貌進(jìn)行了測(cè)試及觀察。通過(guò)對(duì)冷壓及熱壓剎車(chē)片試樣的性能測(cè)試結(jié)果進(jìn)行了比較研究,得出:(1)冷壓燒結(jié)剎車(chē)片在硬度和摩擦系數(shù)上與熱壓燒結(jié)剎車(chē)片性能相近;(2)冷壓燒結(jié)剎車(chē)片在密度、抗壓強(qiáng)度及摩擦系數(shù)的穩(wěn)定性上比熱壓燒結(jié)剎車(chē)片性能更好;(3)在高速下,熱壓燒結(jié)剎車(chē)片的磨損量要比冷壓燒結(jié)剎車(chē)片少。最終結(jié)論是:冷壓燒結(jié)剎車(chē)片的性能與CRCC(中鐵檢驗(yàn)認(rèn)證中心)規(guī)定的摩擦材料性能標(biāo)準(zhǔn)相近,即冷壓燒結(jié)法更適合重載剎車(chē)片的制造。其燒結(jié)制造參數(shù)為:冷壓壓制壓力300MPa,燒結(jié)壓力3Mpa,燒結(jié)溫度950℃,升溫速率50℃/min,保溫時(shí)間5分鐘。
[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，

本文編號(hào)：1506836