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本文分析了管片式散热器芯子装配中存在的问题,提出了管片式散热器芯子自动装配的自动分片原理和方法,设计了散热器芯子的管片定位系统。本研究为实现散热器芯子自动装配机提供了技术基础,为散热器的柔性化生产创造了条件。 相似文献
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活塞环是发动机汽缸体内的主要摩擦副,它的质量如何直接影响到发动机的性能、工作可靠性和使用寿命。由于活塞环在气缸体内承受着高压以及因摩擦而产生的高温,工作条件极为恶劣,所以活塞环是发动机中最容易磨损的零件,一般使用寿命均不长,需要频繁更换,造成活塞环市场需求量很大。为了提高了异形活塞环的加工效率,满足市场需求,设计制造了一种自动活塞环切割机液压异形夹头。提出了液压异形夹头的技术方案及工作原理,解决了自动活塞环切割机的自动切割、循环加工的技术问题。同时介绍了自动活寒环切割机的结构,目的是使液压异形夹头能合理的安装在活寒环切割机上使用。 相似文献
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对现有型材砂轮切割机进行分析研究,针对其生产效率低、加工精度低,特别是不易进行角度切割等缺陷,研制了一台新型管材砂轮切割机。该切割机利用液压—气动传动来实现工件的进给;通过调整砂轮与工作台的角度可准确切割不同角度的工件;通过液压配合气动驱动切割机可完成对工件的自动装夹,工作高效稳定;使用变频电机技术使砂轮的线速度运行均匀。该砂轮切割机能切割不同角度、不同尺寸的管材,加工效率高,适用范围广。 相似文献
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以应变电测原理和技术测量了自动切割机在切割印刷电路板工作状况下印刷电路板受力点边界的应变值,为指导生产提供依据.在印刷电路板受力边界各测点粘贴标距为1×1的胶基泊式电阻应变片.将粘贴有电阻应变片的印刷电路板置于自动切割机的工作台上.驱动切割机对印刷电路板进行切割,以静态电阻应变仪测出各测点的应变值.实验结果表明各测点的应变值均满足设计要求,对实验结果进行分析讨论. 相似文献
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本文论述了自动调高系统对数控切割机的重要性,分析了数控火焰切割机自动调高系统设计的难点,设计了电容式自动调高系统的传感器和控制系统,并对整机测试结果做了分析。结果表明,本文所设计的电容式自动调高系统具有良好的稳定性,较高的精度和灵敏度,满足实际需求。 相似文献
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电机控制系统是数控火焰切割机自动调高器中的关键部件。提出了自动调高器中电机控制系统的方案,设计了基于单片机的PWM直流电机控制硬件电路,指出了本系统软件设计需解决的关键问题,并设计了相应的控制软件。该系统设计了一种实用新型的切割机自动调高系统,较好地解决了电机转动惯性对调高精度的影响。 相似文献
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A study of the effect of tool cutting edge radius on ductile cutting of silicon wafers 总被引:1,自引:1,他引:1
K. Liu X. P. Li M. Rahman K. S. Neo X. D. Liu 《The International Journal of Advanced Manufacturing Technology》2007,32(7-8):631-637
Ductile mode cutting of silicon wafers can be achieved under certain cutting conditions and tool geometry. An experimental
investigation of the critical undeformed chip thickness in relation to the tool cutting edge radius for the brittle-ductile
transition of chip formation in cutting of silicon wafers is presented in this paper. Experimental tests for cutting of silicon
wafers using diamond tools of different cutting edge radii for a range of undeformed chip thickness are conducted on an ultra-precision
lathe. Both ductile and brittle mode of chip formation processes are observed in the cutting tests. The results indicate that
ductile cutting of silicon can be achieved at certain values of the undeformed chip thickness, which depends on the tool cutting
edge radius. It is found that in cutting of silicon wafers with a certain tool cutting edge radius there is a critical value
of undeformed chip thickness beyond which the chip formation changes from ductile mode to brittle mode. The ductile-brittle
transition of chip formation varies with the tool cutting edge radius. Within the range of cutting conditions in the present
study, it has also been found that the larger the cutting edge radius, the larger the critical undeformed chip thickness for
the ductile-brittle transition in the chip formation. 相似文献
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高速切削30CrNi3MoV淬硬钢切屑形成机理的试验研究 总被引:3,自引:0,他引:3
通过30CrNi3MoV淬硬钢的高速切削试验,观察和测量不同切削条件下切屑形态的演变过程、锯齿状切屑形成的临界切削条件、切削力.结果表明,切削速度和刀具前角是影响切屑形态和切削力的主要因素,随着切削速度的提高,在某一临界切削速度下,切屑形态由带状屑转变为锯齿状切屑,随着刀具前角由正前角逐渐变为负前角,临界切削速度明显减小,当锯齿状切屑形成时,切削力大幅度降低.使用金属切削过程中绝热剪切临界切削条件判据对锯齿状切屑形成临界切削速度预测的结果表明,锯齿状切屑形成的根本原因是主剪切区内发生周期性的绝热剪切断裂. 相似文献
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应用激光粉末熔覆技术,在高速钢车刀的前刀面上制备出断屑台。通过切削实验,对比普通高速钢车刀和含激光熔覆断屑台车刀的断屑效果,观察激光粉末熔覆断屑台的金相组织和形貌,测试激光粉末熔覆断屑台的热膨胀系数、物相和显微硬度。研究结果表明:具有激光熔覆断屑台的高速钢车刀,在切削过程中能够减小切屑的卷曲半径,从而使切屑更容易折断,实现有效断屑。用M2/WC-12Co粉末制作激光熔覆断屑台,能够实现激光熔覆层与高速钢基体的良好冶金结合,熔覆层无熔覆裂纹缺陷,熔覆层的硬度与高速钢车刀基体相近。M2/WC-12Co激光熔覆粉末适于制作高速钢刀具的激光熔覆断屑台。 相似文献
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Characterization of chip formation during machining 1045 steel 总被引:1,自引:1,他引:0
Yang Qibiao Liu Zhanqiang Wang Bing 《The International Journal of Advanced Manufacturing Technology》2012,63(9-12):881-886
A deep understanding of the generation and characterization of chip formation can result for practical advices of chip type controlling in engineering applications. The chip formation is divided into the continuous chip and the serrated one in this study. The characterization of the continuous chip formation is expressed as the chip deformation and that of the serrated chip formation is expressed as the frequency of serration, the degree of segmentation, and the deformation of serrated chip. The chips of 1045 steel under different cutting speeds (100–3,600?m/min) are collected during machining. After inlay and polishing of the collected chips, the chip morphology is observed with VHX-600 ESO digital microscope. It is found that at the cutting speeds of 100–400?m/min, the chip type is continuous, at the cutting speeds of 600–2,200?m/min the chip type is serrated, and at the cutting speeds of 2,500–3,600?m/min the chip type is segmented. The quantitative relations between the characterization parameters of chip formation and the cutting speed are obtained. The chip deformation increases with the cutting speed, and the influence of the cutting speed on the shear strain rate is more sensitive than that on the shear strain during the continuous chip formation. All the characterization parameters including the shear strain rate, the frequency of serration, the degree of segmentation, and the shear strain increase with the cutting speed during the serrated chip formation. The sensitivity of influence of the cutting speed on these parameters is in the following: the shear strain rate, the degree of segmentation, the frequency of serration, and the shear strain. 相似文献
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为了研究45钢高速加工中切屑形成机理,建立了高速加工的正交切削有限元模型,研究了45钢高速切削有限元建模过程中的Johnson-Cooks材料模型,刀屑接触模型及切屑分离准则等关键技术.利用建立的有限元模型对45钢的高速切削过程中的切屑成形进行了数值模拟,并研究了不同切削速度对切屑锯齿化程度的影响规律,得到了不同切削速度下的切屑锯齿化程度. 相似文献