精密弹簧片成型与校平工艺优化研究

精密弹簧片为惯性仪表的关键零件,其成型与校平工艺对仪表的测量精度有重大影响。从设计要求出发,针对传统加工工艺中难点问题制定合理工艺路线,尤其对弹簧片成型与校平等工艺进行详细分析,确定了更优的工艺路线。采用优化后工艺加工的弹簧片尺寸、形位公差等均可满足设计要求,且改进后工艺加工过程在零件断面表面形成加工硬化层,增强了零件的疲劳强度。     

橡胶密封圈用弹簧片的模具设计

本文详细介绍了弹簧片的模具结构;根据产品生产的要求,通过模具多次冲裁,提高了工件加工精度、解决了加工复杂的问题,节约了成本。     

蝶形弹簧片扩孔夹具

如图,为搪、扩蝶形弹簧片内孔的简易车夹具。 加工时,仅须把夹具体1,夹持在车床三爪卡盘上,就能顺利地对簧片进行搪、扩孔加工。 蝶形弹簧片是成批生产的标准冲压件。但在某些情况下,例如蝶形弹簧片的外形尺寸需保持不变,而内孔尺寸必须稍加扩大,此时可采用夹具,就能方便地在车床上对工件进行装夹(多件)后搪、扩孔加工。 本工件内孔可由φ25mm扩至φ626mm。     

简单的弹簧片夹具

我厂在加工大尺寸的薄壁套时,采用了一种简单的弹簧片夹具,这种夹具经济适用。现将它介绍如下。 (一)夹具结构和操作方法:夹具的桔构如图1所示,1是过渡法兰盘,用螺钉2与本体3连接在一起。4是弹簧片,上面开有径向槽。这弹簧片套在本体3的凸台上。5是压板。6是螺钉。7和8是球面垫圈。当拧紧螺钉6时,压板5就压向弹簧片     

弹簧片涨升式钻模

加工体壳、床身等工件时,常有在孔之周围钻攻2～8个螺孔。过去是由划线钻攻来完成。现在设计之弹簧片涨开式钻模,只须将弹簧片芯子套入孔内,将偏心轮手柄压紧,弹簧片(材料:65;调质、碎硬RC35～40;槽均匀分布。)即涨开,同时夹紧、定心。此夹具构造较简单、使用方便(尤其适用于自由公差孔),并可省去一道划线工序。弹簧片涨升式钻模$上海机床厂     

超薄QBe2CY弹簧片时效后显微硬度值偏低原因分析及改进方法

正近年来,弹簧片需求数量的不断增加及滚动组批投产的生产策略,加工数量猛增,各种规格零件的年投产数量在6000~8000片之间。由于该弹簧片作为某产品重要用途的弹性元件,要求非常薄,厚仅为0.2mm,同时外形要求一致性好,无翘曲,具有适合的刚度。弹簧片形状如图1所示。弹簧片的显微硬度值技术要求极严,每炉批次时效处理后的显微硬度要求达330~360HV。弹簧片每炉批次时效处理后出现较大比例显微硬度值偏低现象,如果不解决显微硬度值偏低的问     

弹簧片自动定心夹具

用三爪卡盘装夹薄而软的合金工件(图1),比较困难。为此,我们设计了弹性自动定心夹具,解决了装夹问题。夹具体(图2)一端可按车床主轴锥孔配制,另一端加工成有内阶梯孔的结构,与弹簧片配合,弹簧片的形状     

利用模压法巧改弹簧

我们在设计、生产电池装配机时需要作用，如图1所示的小弹簧片。数量不多，但制作时间要求紧。所以想利用挂钟弹簧改制几个。如果弹簧片退火加工，做好后还要淬火，开始退火做了几个，不好加工，外形也没达到要求。剩下的没退火片弹簧不多了，我想用冷模压的方法来制作。我看到虎钳上钳口正好有一个半圆孔和一个三角槽，如图2所示，找了一个圆柱铁棒，利用虎钳的压力，按图的要求做了10多个弹簧片。经装配使用后效果很好，又不用热处理。使用后大家都非常满意，解决了一件使人感到头疼的事。我认为利用这种模压的方法改制的小弹簧片，经使用…     

矿山机械回转臂用推力角接触球轴承套圈加工方法分析

分析了某非标准推力角接触球轴承套圈车、磨加工中存在的问题,提出了相应的解决方法,特别提出了以车代磨加工套圈的方法,并给出了刀具材料、角度、切削参数及工件装夹方式等,在保证产品质量的前提下提高了加工效率。     

精密弹簧片零件校平方法创新与应用

铁-镍-铬系奥氏体高弹性合金精密弹簧片是高精度传感器的重要零件,在加工过程中校平难度很大。通过对材料性能及加工工艺分析,使用自制校平机对上下两面采用两种不同硬度材料进行挤压成形的铁-镍-铬系奥氏体高弹性合金精密弹簧片进行校平,解决在校平过程中出现划伤、折痕、翘曲、波浪纹和死弯等现象,平面度可达到0.03 mm,即保证了质量,又提高了工作效率。     

不同数控系统精加工方法在车床上的应用

通过在华中数控、FANUC数控和西门子数控循环中设置精加工程序,在精加工中修改刀具磨损值,从而保证首件试切零件或单件重要零件的加工精度。     

Investigation on surface finish and metallic particle emission during machining of aluminum alloys using response surface methodology and desirability functions

The surface finish of a mechanical part plays an important role as it determines the part’s field performance. The machining parameters and conditions governing the part surface finish also impact on the other machining process performance indicators such as tool wear, tool life, cycle time, machining cost, and undesirable emissions of aerosols and metallic particles. In today’s metal cutting industry, a major concern is the occupational safety and health hazard associated with cutting fluids usage and metallic particle emission. It is therefore necessary to determine machining conditions that could improve the part surface finish while maintaining low the aerosol emission. In this research study, statistical methods are used to study the surface finish parameters and the metallic particle emissions during milling of aluminum alloys (6061-T6, 7075-T6, and 2024-T351) with two coated carbide tools (TiCN and a multilayer TiCN?+?Al₂O₃?+?TiN). Following an implementation of multilevel design of experiment, machining trials and determination of mains most influential factors, surface responses and desirability functions are used to determine the best process operational conditions and windows. The results of this research demonstrate that TiCN-coated tool generates fewer respirable airborne particles during machining than multilayers TiCN?+?Al₂O₃?+?TiN-coated tool. Overall, it is shown that the use of TiCN coating tool provides a better opportunity for an environmentally benign dry machining along with improvement on surface quality.     

Integration of fuzzy logic with response surface methodology for thrust force and surface roughness modeling of drilling on titanium alloy

In recent years, a lot of extensive research work has been carried out in drilling operations for achieving better hole quality. Drilling operation is one of the machining processes, and it widely used in aeronautical and automotive industries for assembling the parts. The surface roughness is one of the significant factors in drilling operation because the poor surface finish will affect the material condition during the assembly. The spindle speed and feed rate are the important factors to affect the surface finish. In addition, the detailed analysis of the thrust force is also to be investigated for characterizing the cutting process. However, for examining the machining characteristics more trial runs are required, and it increases the time and cost of the experiment. In this paper, the integration of fuzzy logic (FL) with response surface methodology (RSM) has been introduced to reduce the cost and the time consumption for investigation. The low, middle, and upper levels of spindle speed with low and upper levels of feed rate combinations were examined on cutting force and surface finish through the experimental setup with the systematic manner. The FL model for thrust force and surface finish were obtained from the collected experimental data. The FL model has developed another two combinations of data without experimentation through universal partitioning. The results show that the predicted FL values are within the range of experimental value. Therefore, the FL model values were selected for further investigation with RSM. The result of FL-RSM model values are also within the range of experimental value. The proposed FL-RSM model and FL model are validated with experimental results. Finally, the validated results show that hybrid FL-RSM produces the effective output than the FL model.     

一排行星框架精加工关键工序工艺设计

重点对重型车辆高功率密度综合传动装置核心零件一排行星框架精加工工艺进行了阐述。对消除影响该零件加工精度的因素,在工艺实践中所采取的有效措施进行了总结。为一排行星框架及其同类产品在精加工阶段有效控制精度,提高产品质量和生产效率,实现批量生产,提供了技术依据。     

滚轮零件的数控加工分析

分析一种滚轮零件的结构特点,采用锻造、普通车床粗加工、数控车床精加工此零件。在加工此零件时,通过采用合理的工艺与工装。并优化数控加工程序,保证了零件的加工质量并提高了加工效率。     

Drilling of hybrid aluminium matrix composites

This paper presents the influence of cutting parameters on thrust force, surface finish, and burr formation in drilling Al2219/15SiCp and Al2219/15SiCp-3Gr composites. The composites were fabricated using the liquid metallurgy method. The tools used were commercially available carbide and coated carbide drills. The results revealed that feed rate had a major influence on thrust force, surface roughness, and exit burr formation. Graphitic composites exhibit lesser thrust force, burr height, and higher surface roughness when compared to the other material. The reduced thrust force and burr height is attributed to the solid lubricating property of the graphite particles. The higher surface roughness value for Al2219/15SiCp-3Gr composite is due to the pullout of graphite from the surface. The chips formed when machining graphitic composites are more discontinuous when compared to SiCp reinforced composites and hence advantageous.     

飞机大部件接合交点孔精加工技术研究

通过对飞机大部件接合交点孔制造过程进行分析,提出了一种采用动力切削设备替代传统人工方式,实现飞机大部件接合交点孔精加工的技术,并进行了试验验证。结果表明,采用自动进给钻结合精加工工装的方案有效、可靠,能够满足大部件叉耳配合交点孔精加工的技术要求。鉴于飞机大部件叉耳配合交点孔对接精加工工装定位形式受产品结构因素影响较大,建议产品设计人员在满足飞机强度和疲劳等因素的基础上,采用用于固定精加工工装的工艺孔,该工艺孔可在部件状态单独制出,从而实现精加工用工装的准确定位。     

基于毛坯模型的自动工艺规划

针对大多数现有CAD／CAM系统还不能自动获取并处理尺寸公差、形位公差、表面粗糙度等制造信息，在完成产品设计后无法自动生成相应工艺规划的现状，着重研究对零件设计模型补偿面、体加工特征自动生成毛坯模型后，基于毛坯模型自动提取面、体制造特征的工艺约束信息参数，毛坯模型总体信息参数，结合制造资源数据库、工艺知识库完成工艺规划。将毛坯模型逆变换为设计模型，实现了加工工序过程的拟实验证。     

Modelling the influence of machining dynamics on surface topography in turning

In finish machining, even with high precision machines, the influence of the dynamic behaviour of the machine tool and workpiece on the surface quality can be significant. This is especially true during interrupted cutting or the machining of ultra-hard materials. A method for modelling the influence of the machine dynamics, as part of an overall machining simulation framework, is presented here. Finally, two examples of the use of this simulation framework are presented and compared to typical machined surfaces and to simulation methodologies presented in the literature.     

基于Cimatron的复杂曲面数控加工研究

基于Cimatron软件CAD/CAM集成环境,通过对加工工艺的分析比较得出对平缓型曲面可以用“WCUT”进行粗、精加工,对凹凸型曲面先用“WCUT”进行粗加工,再用“SRFPKT”进行精加工,给出了一种加工效率高、成型质量好的数控加工方法。以实例对其进行分析,并给出了数控加工模拟效果图,证明该方法既可提高加工效率,又可获得较好的表面加工质量。