共查询到20条相似文献,搜索用时 41 毫秒
1.
为了对SLM快速成型不锈钢零件的组织及力学性能进行分析与研究,用SLM制备了拉伸试样进行拉伸试验,对其断口进行电镜扫描,分析其断裂特点;利用SLM设备制备了金属立体,进行显微硬度的测试、金相组织分析。实验结果表明:SLM快速成型金属件具有良好的拉伸性能、拉伸试样为韧性断裂;零件内部具有良好的致密性、晶粒细小,显微硬度高于一般奥氏体不锈钢;内部组织结构均匀,具有定向凝固特征;成型件物相主要以奥氏体存在。SLM成型金属件具有良好的组织特性及力学性能,能够满足实际使用的要求。 相似文献
2.
研究了基于数字化3D技术的全膝置换股骨假体再设计并通过激光选区熔化(SLM)技术直接制造了股骨假体,以满足医学上对全膝置换股骨假体的高适配性要求。对一名患者的全膝关节CT连续断层图像提取股骨3D模型,根据骨科医生手术规划进行了数字化3D解剖与测量,并据此对目前商业化的假体进行了重新设计。然后,利用SLM技术直接制造了再设计完成的3D股骨假体模型,并讨论了制造工艺参数、机械性能、空间优化摆放位置以及成型精度等关键技术。实验结果显示:依据患者股骨远端解剖参数可完成股骨假体的3D模型再设计并可利用SLM技术直接制造出股骨假体,单个股骨假体成型时间为5.2h,成型精度标准偏差为0.030mm,成型致密度达到99.02%;热处理后成型性能优于美国实验材料学会(ASTM)F75的铸造标准。得到的结果表明该项技术可以快速制造完成患者所需要的股骨假体,且成型性能优良。 相似文献
3.
选择性激光熔化(SLM)技术是目前较先进的激光快速成型技术,而高精度的SLM设备是进行SLM快速成型研究的基础.由于进口设备价格昂贵,所以自主开发了一套SLM设备.论述了该设备的设计和制造要求、总体结构和工作原理及主要组成部分的性能特点和功能.给出了加工实例.该设备具有成本较低、运行平稳、加工精度高等特点,为同类设备的研发提供了借鉴. 相似文献
4.
5.
为优化现有的门把手功能零件,采用了受力分析及拓扑优化的方法,设计出符合零件内部力场分布特点的功能件,通过激光选区熔化技术(Selective laser melting,SLM)获得打印成型件,并经过尺寸精度、力学性能及质量等方面的测试,获得减重52.5%轻量化效果,力学性能达到传统铸锻件及尺寸精度符合需求的优化设计成品。SLM加工获得的功能件应用于密封舱门,在真空度-30 k Pa、氧含量浓度10 ppm条件下测试,模拟分析变形位移6.9μm。证明基于激光选区熔化技术进行优化设计能使得优化功能零件过程中拥有极高的自由度,故基于激光选熔化技术,采用拓扑与布局优化、结构类型优化等结构优化设计方法,达到减轻产品重量并改善性能等目标的思路是可行的。 相似文献
6.
主要研究SLM激光快速成型过程中各工艺参数对成型件表面粗糙度的影响.影响成型件表面粗糙度的工艺参数主要有激光功率、扫描速度、搭接率、切片层厚和倾斜角度.采用正交实验方法,研究激光功率、扫描速度、搭接率三个工艺参数对快速成型件水平面表面粗糙度的影响规律、倾斜角度对斜面表面粗糙度的影响以及切片层厚对零件的垂直面的表面粗糙度影响.实验结果表明:搭接率是影响水平面表面粗糙度的最主要的因素,当其它参数相同,搭接率为30%时,表面粗糙度值最小;倾斜角度越大,表面粗糙度值越小;切片层厚越小,表面粗糙度值越小. 相似文献
7.
8.
快速成型技术就是直接根据CAD模型,快速生产样件或零件的成组技术总称[1],它是先进制造技术的重要组成部分.本文主要介绍了激光选区粉末烧结(SLS)技术的原理,并结合工业生产,研究了SLS快速成型件的后处理工艺,为激光选区粉末烧结快速成型技术的进一步应用打下了良好的基础. 相似文献
9.
10.
激光增材制造技术具有快速成形复杂形状零件的优势,近年来得到广泛关注。介绍了定向能量沉积和选区激光熔化2种激光增材制造技术,从常见缺陷、组织及织构、力学性能等方面综述了激光增材制造成形316L不锈钢的研究进展,分析了当前激光增材制造成形316L不锈钢存在的问题,并对其发展前景进行了展望。 相似文献
11.
Precision laser adjustment using CW diode laser 总被引:1,自引:0,他引:1
Precision adjustment has many applications in various fields, particularly in laser generation systems and precision engineering. In this paper, a laser forming method for the precise adjustment of a rod with a diameter of several millimeters is investigated. Experiments on precision laser adjustment are carried out using a fiber-coupled passively cooled CW diode laser. The effect of important parameters is investigated in detail. Parametric studies are carried out to determine suitable processing windows at which a small and stable laser-adjusting angle is obtained. A coupled thermomechanical model established using the finite element method is validated and applied to predict the deformation of the rod and better understand the mechanism of precision laser adjustment. A simple closed-form expression for the precision laser-adjusting angle is proposed. An application on precision laser adjustment is presented. 相似文献
12.
13.
点激光测头激光束方向标定 总被引:5,自引:0,他引:5
为了使点激光测头能在任意方向上实现测量功能,提出一种逆向工程中标定激光束方向的方法,设计了一种标定面方向可调的标定块配合标定。标定过程中,让激光测头在标定面上分别沿X、Y、Z3个轴方向做等间距运动,根据进给步长与激光束长度变化量之间的关系确定激光束的方向。以三坐标测量机为平台,给出了以任意方向安置点激光测头时,测量值从传感器坐标系到基准坐标系的转换过程,并对标定算法及整个标定过程进行了详细描述。最后,通过与接触式测量进行对比实验,验证标定后点激光测头的测量效果。实验结果表明,用该方法标定的点激光测头在3σ范围内沿任意方向的测量误差为(0.0452±0.0168)mm,满足逆向工程的测量要求。 相似文献
14.
15.
激光切割技术因其独特的优势,在现代制造领域占有越来越重要的地位。本文主要采用空气动力学原理对喷嘴内部进行了气流特性分析,提出了拉法尔喷嘴的设计方法,对于今后激光切割机中激光喷嘴设计具有一定指导作用。 相似文献
16.
17.
Kline JL Shimada T Johnson RP Montgomery DS Hegelich BM Esquibel DM Flippo KA Gonzales RP Hurry TR Reid SL 《The Review of scientific instruments》2007,78(8):083501
A multiframe, high-time resolution pump-probe diagnostic consisting of a consecutive train of ultrashort laser pulses (approximately ps) has been developed for use with a chirped pulse amplification (CPA) system. A system of high quality windows is used to create a series of 1054 nm picosecond-laser pulses which are injected into the CPA system before the pulse stretcher and amplifiers. By adding or removing windows in the pulse train forming optics, the number of pulses can be varied. By varying the distance and thickness of the respective optical elements, the time in between the pulses, i.e., the time in between frames, can be set. In our example application, the CPA pulse train is converted to 527 nm using a KDP crystal and focused into a preformed plasma and the reflected laser light due to stimulated Raman scattering is measured. Each pulse samples different plasma conditions as the plasma evolves in time, producing more data on each laser shot than with a single short pulse probe. This novel technique could potentially be implemented to obtain multiple high-time resolution measurements of the dynamics of physical processes over hundreds of picoseconds or even nanoseconds with picosecond resolution on a single shot. 相似文献
18.
Shingo Kashima 《Scanning》1995,17(2):66-69
We have developed a legitimate fluorescence con-focal scanning microscope (CLSM) using a near ultraviolet (UV) laser. This system has almost no chromatic aberration from the near UV region to the visible region (350–600 nm), and the objectives are designed as water-immersion type. Therefore this system provides the high-quality fluorescence image excited by the near UV laser, and high-quality image of deep points in a sample. 相似文献
19.
The optics of a novel two-frequency laser is presented in this paper. The key components are a laser and a modulation unit consisting of acousto-optical modulators and Wollaston prisms. Different laser types can be used, covering a large wavelength range. The frequency difference is tunable. Use of the Wollaston prisms results in an efficient, compact, and stable unit with one optical axis. Its components are easy to align. 相似文献