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1.
薄壁不锈钢零件冷风加工探讨   总被引:2,自引:0,他引:2  
针对不锈钢制做的薄壁测试模型的难切削性,采用了冷风切削加工技术。实验结果表明,这种方法能够加工出达到测试模型要求的零件。冷风切削不锈钢的实验成功,为航空实验水平上台阶,创造了条件。  相似文献   

2.
不锈钢切削加工的研究   总被引:4,自引:2,他引:4  
谢国如 《工具技术》2004,38(12):23-25
为解决不锈钢加工困难的问题,从选择刀具材料、刀具角度和切削用量三方面对不锈钢的切削加工进行了分析和研究。  相似文献   

3.
干式、半干式和低温冷风切削加工技术   总被引:3,自引:0,他引:3  
切削热是伴随金属切削过程中必然的一种物理现象,对工件质量、刀具寿命有不可忽视的影响。低速切削时,机械磨损是刀具磨损的主要原因;而高速切削时,切削高温诱导刀具的磨损,由机械磨损为主转化为扩散磨损、相变磨损和炭化磨损为主要磨损机理,并引发刀具表面的粘结磨损。切削热还使刀具和工件热膨胀,加剧后刀面摩擦与磨损,引起工件表面粗糙度上升,故超精加工工艺特别强调必须及时、有效地控制切削热在工件、刀具内的传导。控制刀具、工件温升对数控加工有十分重要的意义。 要控制金属的切削热及刀具、工件的温升,必  相似文献   

4.
5.
铬镍不锈钢的切削加工   总被引:1,自引:0,他引:1  
文章根据铬镍不锈钢的性能和特点,结合应用实例,介绍了铬镍不锈钢加工时各加工参数选择对加工的不同影响。  相似文献   

6.
本文通过DYJ45-300211活塞试生产介绍,总结00Cr19Ni11超低碳奥氏体不锈钢的切削特点,及在车削、钻削及攻丝时,如何合理选择刀具材料,刀具几何参数,机加工切削参数等,并总结如何通过冷却、热处理等技术方法改善奥氏全不锈钢的切削加工性能。  相似文献   

7.
低温冷风切削技术浅谈   总被引:5,自引:3,他引:5  
张震  何曙华 《工具技术》2002,36(6):32-33
金属切削加工是通过刀具和工件的相对运动来完成材料的移除。切削时会产生大量的切削热 ,使刀具、工件甚至机床的温度升高。为了减少刀具磨损、降低加工部位的温升 ,通常使用大量的切削油。但是 ,使用切削油作为冷却润滑剂会造成很多问题。首先是环境问题 :在加工过程中产生的大量油雾、飞溅的油沫以及泄漏的切削油是车间厂房的主要污染源 ;粘附在切屑上的油污很难清除 ,往往随废水排入江河 ,污染环境 ;在切屑回收过程中 ,使用燃烧或化学处理方法清除油污 ,不仅增加了回收成本 ,而且再次污染环境。其次是成本问题 :据日本有关方面统计 ,在金…  相似文献   

8.
罗国昌 《机械制造》1996,(12):27-28
提出了改进标准丝锥的几何参数及合理选择切削速度和切削液,以改善不锈钢丝锥切削加工性能。  相似文献   

9.
初犁 《工具技术》1993,27(10):22-26
本刊上期介绍了不锈钢钻削加工中的一些值得注意的问题。这里介绍的是近年来不锈钢外圆切削、沟槽加工、小直径镗削加工、螺纹加工及切断加工的一些新进展。文中提到的刀具大都在国外展览会上作过切削表演,在刀具结构方面,针对不锈钢难于加工的特点,作了不少改进,加工效率和加工精度均有不同程度的提高。  相似文献   

10.
干式、半干式和低温冷风切削加工技术   总被引:4,自引:0,他引:4  
在切削过程中,三个变形区的金属产生弹性变形、塑性变形及摩擦变形,切削功率的99.5%均转变为剪切滑移变形(第一变形区)、前刀面摩擦变形(第二变形区)及挤压、过剩变形、后刀面摩擦变形(第三变形区)所耗能量,并在一瞬间转变为热能,出现切屑、刀具切削刃区域及工件表面温升的现象。  相似文献   

11.
This paper presents the results of experimental work in dry turning of austenitic stainless steels (AISI 304 and AISI 316) using CVD multi-layer coated cemented carbide tools. The turning tests were conducted at four different cutting speeds (120, 150, 180 and 210 m/min) while feed rate and depth of cut were kept constant at 0.16 mm/rev and 1 mm, respectively. The cutting tools used were TiC/TiCN/TiN and TiCN/TiC/Al2O3 coated cementide carbides. The influences of cutting speed, cutting tool coating top layer and workpiece material were investigated on the machined surface roughness and the cutting forces. The worn parts of the cutting tools were also examined under scanning electron microscope (SEM). The results showed that cutting speed significantly affected the machined surface roughness values. With increasing cutting speed, the surface roughness values decreased until a minimum value is reached beyond which they increased.  相似文献   

12.
通过对不锈钢材料的分析,研究在切削中各种因素的影响,从刀具材料、角度以及切削参数等,结合工件结构以及加工装夹等方面进行阐述。实践证明,选择合理的加工方法、装夹方式及切削参数,解决了此类零件的加工工艺问题。  相似文献   

13.
冷风发生装置及风冷却削用技术   总被引:3,自引:0,他引:3  
介绍了风冷却切削技术中的冷却设备及风冷却切削的优优点,阐述了风冷却切削技术的研究方向。  相似文献   

14.
改善不锈钢切削加工性的试验研究   总被引:1,自引:0,他引:1  
这里推导出阶梯法耐用度试验的数据处理公式,并利用此方法对普通奥氏体不锈钢和加硒不锈钢材料进行了切削加工对比试验,证明了加硒不锈钢的切削加工性比普通奥氏体不锈钢提高了1.5倍。  相似文献   

15.
It is well known that machining results in residual stresses in the workpiece. These stresses correlate very closely with the cutting tool geometrical parameters as well as with the machining regime. This paper studies the residual stress induced in turning of AISI 316L steel. Particular attention is paid to the influence of the cutting parameters, such as the cutting speed, feed and depth of cut. In the experiments, the residual stresses have been measured using the X-ray diffraction technique (at the surface of the workpiece and in depth). The effects of cutting conditions on residual stresses are analyzed in association with the experimentally determined cutting forces. The orthogonal components of the cutting force were measured using a piezoelectric dynamometer.  相似文献   

16.
    
This work presents a systematic and comprehensive investigation of the protective effect of built-up layer (BUL) in dry cutting of stainless steel SUS304. A detailed examination of BUL and built-up edge (BUE) formation conditions, their formation mechanisms, and their protective effect was carried out at different cutting speeds (5–140 m/min), and different feed rates (0.02–0.1 mm/rev). The uncoated cemented carbide tool was used as a cutting tool. The dimensions of BUL/BUE and tool wear were measured by scanning electron microscope (SEM) and laser confocal microscopy (LCM). The protective effect of BUL/BUE was characterized using flank wear progression, as well as crater wear progression, cutting force analysis, and surface roughness analysis. As a result, it was found that BUE forms around the cutting edge at low cutting speeds (5–20 m/min), and BUL, which resembles a water drop, forms on the tool rake face at cutting speeds equal to or above 40 m/min. And a thin layer of flank built-up (FBU) can form on the tool flank face as the cutting speed increases from 40 m/min to 140 m/min. The BUL/BUE formation mechanism was also confirmed. It was revealed that BUL can be considered as a protective layer, which can not only prevent the tool rake face from wear but also decrease the tool flank wear, but BUE can only prevent the crater wear; and to a certain extent, the thin layer of FBU can also work as a protecting layer on the worn tool flank face in dry cutting of SUS304. It was also revealed that the height of BUL plays a very important role in its protective effect. Meanwhile, it was found that BUL and the thin layer of FBU have no or few influences on the amplitude variation of cutting forces and on the surface roughness. These results indicated that BUL can be used to realize the self-protective tool (SPT) in cutting of difficult-to-cut material such as SUS034. In addition, the research also proved that it is necessary to take the influences of BUL, BUE, and FBU formations on tool wear into account in the tool wear model in order to achieve high-precision prediction.  相似文献   

17.
通过试验对奥氏体不锈钢化学抛光工艺进行优选,研制了环保、经济的不锈钢抛光工艺。  相似文献   

18.
冯涛  张玉 《山东机械》2005,(5):61-62
通过试验对奥氏体不锈钢化学抛光工艺进行优选,研制了环保、经济的不锈钢抛光工艺。  相似文献   

19.
实验研究了Al2O3基纳米复合陶瓷刀具ASs与LTN连续干切削奥氏体不锈钢1Cr18Ni9Ti时的切削性能。结果表明,在相对较高的切削速度下,两种刀具表现出较好的切削性能,其中ASs刀具的主要磨损机制是粘结磨损和微崩刃,而LTN刀具则主要是粘着剥落;在相对低速下切削时,两种刀具都发生粘结破损失效。  相似文献   

20.
针对不锈钢材料难加工的特点,从不锈钢材料热处理、刀具材料选择、刀具几何角度、结构的确定、切削用量选取及冷却方式等多个方面进行解析,并采取相应措施,成功解决了不锈钢材料难加工的问题。  相似文献   

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