共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
Tool-chip and tool-work adhesion often limit machinability, but quantitative methods to characterise adhesion are absent. Hence, a methodology based on interrupted turning was used and layer formation was quantified using a number of techniques. This included surface topography studies using 3D white light interferometry, element mapping and profiling using SEM-EDS and Laser ablation time of flight mass spectrometry (LA -TOFMS) along with temperature mapping using IR-CCD. Results from turning tests with stainless steel 316L indicate clearly that the above techniques compliment each other and provide valuable new insight on contact friction, adhesion and layer formation. 相似文献
3.
4.
To maximize the productivity in machining molds and dies, machine tools should operate at high speeds. However, the productivity of mold manufacturing has not increased significantly because CNC milling machines have massive slides, which do not allow rapid acceleration and deceleration during the frequent starts/stops encountered in machining molds and dies. This paper presents the use of composites for these slides to overcome this limitation. The vertical and horizontal slides of a large CNC machine were constructed by bonding high-modulus carbon-fiber epoxy composite sandwiches to welded steel structures using adhesives. These composite structures reduced the weight of the vertical and horizontal slides by 34% and 26%, respectively, and increased damping by 1.5 to 5.7 times without sacrificing the stiffness. Without much tuning, this machine had a positional accuracy of ± 5μm per 300 mm of the slide displacement. 相似文献
5.
折弯机的加工精度是最主要的性能指标之一,由于板料折弯机结构原理、机床自身制造精度、模具加工精度、被加工板材性能以及机床性能不稳定等方面的原因,加工工件不可避免存在角度误差、直线度误差与边长误差。板料加工误差的存在影响后续的装配、加大试修模以及成形后校形的工作量延长了产品的开发周期,制约了自动化折弯进一步推广和应用。以某PBB型数控板料折弯机为研究对象,运用应变电测技术与有限元仿真相结合的方法对该型折弯机进行了优化与改进,在此基础上试制出一台PBH型样机,研究结果对提高金属板材的折弯精度与可靠性,提高产品的竞争力与附加值有着重要的现实意义。 相似文献
6.
应用UG软件IS&V模块,针对JZDK6040高速雕刻机,建立与实际加工一致的精确运动模型与加工仿真模型,对CAM生成的刀具轨迹程序进行模拟、校验和显示,监控机床、工件和刀具之间的碰撞干涉情况,有效避免实际机床加工过程中误切、过切等现象的发生。 相似文献
7.
G. Meschut V. Janzen T. Olfermann 《Journal of Materials Engineering and Performance》2014,23(5):1515-1523
Driven by increasing costs for energy and raw material and especially by the European CO2-emission laws, automotive industry faces the challenge to develop more lightweight and at the same time still rigid and crash-stable car bodies, that are affordable for large-scale production. The implementation of weight-reduced constructions depends not only on the availability of lightweight materials and related forming technologies, but also on cost-efficient and reliable joining technologies suitable for multi-material design. This article discusses the challenges and requirements for these technologies, based on the example of joining aluminium with press-hardened boron steels, what is considered as a very important material combination for affordable future lightweight mobility. Besides a presentation of recent developments for extending the process limits of conventional mechanical joining methods, new promising technologies such as resistance element welding are introduced. In addition, the performance, advantages, and disadvantages of the presented technologies are compared and discussed. 相似文献
8.
9.
10.
11.
12.
13.
模具曲面加工时,一种方法是采用C0连续刀具路径加工;本文论述了另一种方法即采用C1连续刀具路径加工。后一种方法得到的G代码NC文件更小,加工出来的曲面几何尺寸更精确,表面粗糙度更低,加工和抛光时间更少。 相似文献
14.
15.
16.
17.
18.
Industrial robots represent a promising, cost-saving and flexible alternative for machining applications. Due to the kinematics of a vertical articulated robot the system behavior is quite different compared to a conventional machine tool. This article describes the modeling of the robot structure and the identification of its parameters with focus on the analysis of the system's stiffness and its behavior during the milling process. Therefore a method for the calculation of the Cartesian stiffness based on the polar stiffness and the use of the Jacobian matrix is introduced. Based on the results of the identification and the experimental validation the machining performance of the robot is evaluated and conclusions are drawn. 相似文献
19.
Tribological Characteristics and Cutting Performance of Lubricant Esters for Semi-dry Machining 总被引:1,自引:0,他引:1
In semi-dry machining, such as minimal quantity lubrication (MQL) machining, a very small amount of a lubricant plays an Important role to achieve a successful operation. This study investigates the tribological behavior of lubricants for semi-dry application in connection with their cutting performance. In MQL turning, synthetic biodegradable esters are superior to a vegetable oil and provide the satisfactory cutting performance compared with a conventional cutting fluid of flood supply. Their tribological action is further evaluated with the aid of tool surface analysis and the adsorption characteristics of a model ester are fundamentally examined using a controlled atmosphere machining apparatus. 相似文献