3D Design and Analysis of Crushing Roller of High-pressure Grinding Roller

Crushing roller is one of the main parts of High-p re ssure Grinding Roller, which is a kind of high efficient ore crushing equipment. A kind of assembled roller, which is more convenient to renovate worn surface b y simply replacing segmented surface of the roller, was developed. The structura l models of assembled roller’s components were designed with SolidWorks softwar e based on feature modeling, these solid models of the roller were virtually ass embled. Through this work, not only was the assemble interference checked out so as to examine validity of the structure design, but also these solid models cou ld be recognized by COSMOS/Works software, through which the finite element an alysis can be done. Then the stress and displacement of the main shaft and sur face segment in two different working states were analyzed and detected quickly according to the analysis results with COSMOS/Works. In conclusion, the optimum clearance of 1.0～2.0 mm between concave-convex studded segments is determined to make the using life of assembled roller longer.

基于Design3D的汽轮机低压静叶三维气动优化设计

文章基于商业软件NuMECA的全三维优化设计平台Design3D,采用三维N-S方程流场计算、网格自动生成、三维叶片参数化造型与遗传算法寻优相结合的方法,在级环境下对600MW汽轮机静叶进行了三维叶片型线优化设计。优化目标是在流量基本不变的情况下尽可能地提高级轮周效率。优化设计后的叶片与原叶片相比,透平级的总-总效率提高了0.32%,级的轮周效率提高了0.39%。详细的流场分析表明,优化后叶片性能的提高主要是源于静叶总压损失的减小和透平级动静叶之间匹配的改善。

Development of the 3D-Designed Lathe Fixture of a Float Brake Caliper

According to the technique requests of the brake caliper in the process of production, a special fixture of float brake caliper has been developed based on 3 D design in this paper. The development process and verified data from 3D modeling and kinematics simulation for this special fixture show that this 3D-designed process can conveniently forecast the assembly interference of the fixture and accurately add the mass of lead brick before the prototype is made. In this way the flutter caused by the unbalanced lathe fixture can be eliminated and the precision of run-out tolerance in cylinder hole compared with machine tool spindle can be improved, thus the processing quality of the cylinder hole in a brake caliper can be greatly guaranteed.

First application of 3D design custom-made uncemented prosthetic stem for distal femoral cemented megaprosthesis revision

Objectives:3D design,which is widely used in orthopedics,can be applied for precise distal femoral megaprosthetic revision.This research aimed to present and evaluate the design,perioperative management,and midterm clinical outcomes of a 3D design custom-made uncemented prosthetic stem.Methods:Between January 2014 and January 2016,seven patients received 3D design custom-made uncemented prosthetic stem revision at our institution.Clinical records and radiographs were evaluated retrospectively.Results:There were no hardware-related complications during the follow-up(average 24.3 months;range 24–48 months).The average Musculoskeletal Tumor Society(MSTS)score at the last follow-up after revision(27.7 points,range 25–28 points)was significantly higher than that before(16.0 points,range 13–18 points).In addition,the range of motion(ROM)of the affected knee,and the scores of pain,function,emotional acceptance,support,walking and gait all improved significantly.The antecurvature radian of the revision stem averaged at 3.6°.Of the seven patients,three received femoral stem revision and four received revision of the femoral stem and the femoral component;three of them used longer prostheses than the others.There were no significant differences in function between these two groups at the last follow-up after revision.Conclusion:The 3D design custom-made prosthesis is a typical precision medicine technology in oncologic orthopedics.Characterized by its individually and precisely designed uncemented stem,it offers an alternative option for distal femoral cemented prosthesis revision.Besides the 3D design itself,the perioperative management,especially the techniques for stem implantation,and long-term follow-up are also crucial.

工科专业课堂“3D(Debate/Design/Doing）”教学法研究

基于当前高校工程教育专业认证的要求,论文首次提出了工科专业课堂“3D(Debate/Design/Doing)”教学法,其核心教学理念是“我思故我想,我想故我说,我说故我做,我做故我会”,即通过课堂辩论(Debate)、项目设计(Design)和项目实施(Do?ing),将教师的课堂讲授信息通过这个过程进行批判性思辨,将理论知识和实际效果联系起来。该研究通过在材料加工工程专业模块课程铸造工艺和造型材料的教学实践,取得了所有选课学生的认同,真正做到了让学习过程由被动变为主动、由无趣变成有趣、由枯燥变为生动,学生由自卑变自信,使院系专业课程课堂教学和工程训练平台实现了无缝联合,对于提高工科专业的课堂教学效果具有广泛的借鉴意义,为达到国际工程专业认证标准提供了很好的教学示范作用。

基于Design3D的汽轮机低压静叶三维气动优化设计

本文基于商业软件NUMECA的全三维优化设计平台Design3D，采用三维N-S方程流场计算、网格自动生成、三维叶片参数化造型与遗传算法寻优相结合的方法，在级环境下对600MW汽轮机静叶进行了三维叶片型线优化设计，优化目标是在流量基本不变的情况下尽可能的提高级轮周效率。优化设计后的叶片与原叶片相比，透平级的总一总效率提高了0．32％，级的轮周效率提高了O．39％。详细的流场分析表明，优化后叶片性能的提高主要是源于静叶总压损失的减小和透平级动静叶之间匹配的改善。

基于Geomagic Design X的产品建模研究与3D打印成型--以内燃机连杆为例

以工业产品设计为对象,采用某国产手持激光3D扫描仪获取模型点云数据,结合Geomagic Design X软件介绍逆向设计方法与工业产品逆向建模过程,采用3D打印技术进行快速制造完成产品验证。为产品建模优化与成型提供思路和方法,减少产品开发周期。实践证明采用Geomagic Design X软件可以快速高质量的完成产品模型的重构设计,3D打印可以实现模型的再现验证设计。

3D image system improves the learning curve and contributes to medical education of rhinoplasty

Background: Rhinoplasty is a complex surgical procedure that requires critical analysis and precise design before surgery, making it a challenging operation for both the surgical team and medical educators. This study aimed to evaluate the impact of 3D design involvement on learning curves and to establish a more effective method for rhinoplasty education.Methods: Surgeons who participated in an educational program were divided into two groups. The experimental group was involved in the 3D design before the operation, and the control group was asked to review the rhinoplasty atlas. A self-assessment questionnaire was used to evaluate the learning curve of the eight rhinoplasty procedures for each surgeon, and the overall satisfaction rate data were also collected.Results: The self-assessment scores in both groups showed an increasing trend from the first to the eighth operation. The mean scores of the experimental group were significantly higher than those of the control group at the fifth operation(P=0.01). The satisfaction rate of the experimental group(91.7%) was higher than that of the control group(54.5%).Conclusion: The 3D imaging system can improve the learning curve and satisfaction rate of rhinoplasty education,proving that it is an easy and effective tool for medical education.

基于CLO 3D平台的虚拟广绣定制服装数字化设计

文章将岭南传统广绣元素与虚拟定制服装数字化设计手段相融合,利用CLO 3D虚拟服装设计软件平台,设计出一款广绣定制服装作品。研究基于数字化虚拟服装技术,明确虚拟广绣定制服装的制作流程。研究结果表明,通过新的定制方法,能够有效缩短服装定制时长,降低服装定制成本,同时满足不同体型的合体要求。这项研究为广绣技术的传承与发展指明了新的方向,也为从事服装定制的企业推动数字化进程提供了有益的参考。

基于Smart 3D软件的船舶二维与三维集成设计变更

船舶二维与三维集成设计流程复杂、变更需求大。梳理船舶设计变更研究现状。基于Smart 3D软件,从数据处理、二维与三维映射转换和设计变更管理等方面进行船舶二维与三维集成设计变更关键技术分析,并对船舶二维与三维集成设计变更的可行性进行实例验证。结果表明,基于Smart 3D软件进行船舶二维与三维集成设计变更可有效提升集成设计变更的精度与管理效率。

基于正逆向设计结合的3D打印实践教学

以装配体零件为载体,以正逆向设计结合为思想,以项目式教学为依托的3D打印实践教学项目,引导学生自主创新,注重产品质量。实践过程中部分零件采用正向设计并打印制作成型,其余零件则采用逆向设计并打印制作成型,组装获得完整装配体。教学实施效果表明,实践环节中的产品废品率显著下降,同时学生的课堂参与度显著提升。基于正逆向设计结合的教学方法突破传统的3D打印实践教学思路,锻炼了学生项目管理、自主创新、主动思考解决问题等综合能力,贯彻落实了学生质量观意识的培养。

3D打印技术在舰船管系三维建模设计中的应用

为提升复杂结构舰船管系的设计灵活性,研究3D打印技术在舰船管系三维建模设计中的应用。利用CAD软件建立舰船管系的二维模型,依据舰船管系三角面片的交线段,确定舰船管系的点、线、面关系,将其转换为舰船管系三维模型。将舰船管系三维模型,导入切片软件中,利用切片引擎运行3D打印切片引擎增强处理算法,切片处理舰船管系三维模型,输出舰船管系三维模型的Gcode代码文件。将Gcode代码导入3D打印机,采用Z字填充法填充舰船管系3D打印材料,实现舰船管系模型的3D打印。实验结果表明,该方法可以精准打印舰船管系三维模型,打印结果的尺寸偏差小,提升了舰船管系设计的灵活性。

多组分多层级3D打印材料研究进展

多组分多层级3D打印材料(McMl3DPMs)是一种新兴的先进材料,源于多孔材料、复合材料和增材制造的融合。由于增材制造赋予了Mc Ml3DPMs三维架构跨越广泛组分构成和结构类型的能力,Mc Ml3DPMs拥有杰出的机械性能,甚至是通常被认为相互排斥的性能(例如高强度和高韧性)。本文重点介绍为了实现高性能结构用Mc Ml3DPMs所必须解决的科学挑战以及最近研究工作对此做出的努力,将从结构设计、制造过程建模、缺陷表征和性能评价3个方面对相关案例进行回顾。最后,本文指出了当前研究的不足之处,并展望了Mc Ml3DPMs的未来发展,包括讨论了进一步推进这一新兴领域发展的几个可能的研究方向。

Review on Applications of 3D Inverse Design Method for Pump

The 3D inverse design method, which methodology is far superior to the conventional design method that based on geometrical description, is gradually applied in pump blade design. However, no complete description about the method is outlined. Also, there are no general rules available to set the two important input parameters, blade loading distribution and stacking condition. In this sense, the basic theory and the mechanism why the design method can suppress the formation of secondary flow are summarized. And also, several typical pump design cases with different specific speeds ranging from centrifugal pump to axial pump are surveyed. The results indicates that, for centrifugal pump and mixed pump or turbine, the ratio of blade loading on the hub to that on the shroud is more than unit in the fore part of the blade, whereas in the aft part, the ratio is decreased to satisfy the same wrap angle for hub and shroud. And the choice of blade loading type depends on the balancing of efficiency and cavitation. If the cavitation is more weighted, the better choice is aft-loaded, otherwise, the fore-loaded or mid-loaded is preferable to improve the efficiency. The stacking condition, which is an auxiliary to suppress the secondary flow, can have great effect on the jet-wake outflow and the operation range for pump. Ultimately, how to link the design method to modem optimization techniques is illustrated. With the know-how design methodology and the know-how systematic optimization approach, the application of optimization design is promising for engineering. This paper summarizes the 3D inverse design method systematically.

3D打印导板结合跟骨钉中钉与传统外侧“L”形切口钢板内固定治疗跟骨骨折的疗效

目的探究3D打印导板结合跟骨钉中钉与传统外侧“L”形切口钢板内固定治疗跟骨骨折的疗效。方法回顾性分析2020年1月至2022年1月滨州市中心医院收治的30例单侧SandersⅡ~Ⅲ型跟骨骨折患者作为研究对象,根据固定方式不同分为传统手术组(n=18)与3D打印跟骨钉中钉组(n=12)。传统手术组采用传统外侧“L”形切口钢板内固定治疗,3D打印跟骨钉中钉组采用3D打印导板结合跟骨钉中钉治疗。比较两组内固定效果、手术时间、术中出血量、Gissane角、Böhler角、跟骨宽度、并发症发生情况及疼痛程度。结果两组优良率均为100.00%,组间比较差异无统计学意义;3D打印跟骨钉中钉组手术时间短于传统手术组,术中出血量少于传统手术组,差异有统计学意义(P<0.05);术后,两组Gissane角均小于术前,Böhler角大于术前,跟骨宽度窄于术前(P<0.05),但组间比较差异无统计学意义;3D打印跟骨钉中钉组并发症发生率为8.33%,低于传统手术组的44.44%,差异有统计学意义(P<0.05);术后,两组视觉模拟评分法(VAS)评分均低于术前,且3D打印跟骨钉中钉组低于传统手术组,差异有统计学意义(P<0.05)。结论两种手术方式均为治疗跟骨骨折有效手术方式,3D打印导板结合跟骨钉中钉治疗跟骨骨折可有效减少术中出血,缩短手术时间,降低术后并发症发生率,值得临床推广应用。

基于Style 3D针织运动装虚拟设计与应用

基于Style 3D虚拟服装试衣软件,通过对虚拟试衣技术现状的分析,以针织运动装作为虚拟试衣对象,从四个部分进行展开,包含人体建模,版片的三维排布与缝合,运动装面料仿真与试穿效果展示,以及驳样改款与模块组合。借助于三维面料扫描技术获取面料材质纹理和相关辅料配件,进一步丰富针织运动装的装饰效果。3D快速驳样改款和虚拟展示能有效地优化设计过程,针织运动装模块组合模拟应用适应快时尚节奏下改款搭配的需求,根据现有版型快速驳样改款亦是对传统设计与展示模式的一种突破。

基于FDM工艺的多功能3D打印机结构设计

该文针对传统3D打印机对于零部件的打印精度、加工效率以及许多异形曲面结构打印难以达到加工需求,且设备在运作时还会发热振动,产生噪音等问题进行优化,采用Creo软件设计一种基于熔融沉积制造(FDM)工艺且具备打印、打磨、清扫功能的3D打印机,并对多个零部件3D模型进行仿真和力学分析,分析喷头的温度场分布及五孔连接盖板、脚垫支架的受力分布。结果表明,该设计可实现减少耗材,降低发热振动,有效提高打印精度,缩短打印时间,结构稳定合理,具有较好的推广应用价值。

数智融合环境下AIGC技术赋能3D打印共享平台设计研究

研究以3D打印共享平台设计为例,探讨了数智环境下AIGC技术如何赋能设计应用。首先,分析了数智融合环境和AIGC技术的概念、特点和原则。其次,以3D打印共享平台设计为例,运用问卷调查、任务测试和KANO模型等方法收集用户需求,绘制用户画像,并通过用户体验地图和服务蓝图不断优化平台设计。最后,借助AIGC技术辅助设计了共享平台界面设计、Logo及IP形象等成果。因此,研究在整个设计过程中充分利用了AIGC技术,为3D打印共享平台设计赋能,并论证了数智融合环境下AIGC技术在设计领域应用的可行性,具有重要的现实意义。

以3D增材制造项目为牵引的项目驱动式教学改革探讨——以汽车车身结构与设计为例

为了更好地提升教学效果、培养学生综合能力,文章基于汽车车身结构与设计课程内容与课程目标,提出了一种以3D增材制造项目为牵引的项目驱动式教学改革模式,该模式以“高阶性、创新性与挑战度”为要求,以3D增材制造项目为牵引,构造出具体的结构设计及优化理论与制造实践相结合的教学项目,构建了“设计-优化-制造-测试-应用”全过程的项目驱动教学内容体系。在教学课程实施过程中,学生可充分接触产业前沿,自主探究学习先进理论,并充分锻炼学生解决复杂问题的综合能力,培养出满足产业发展的高素质高能力工程人才全面提升学生能力。

基于椅旁设计和3D打印的数字化栅栏式微种植钉导板的应用研究

目的:评价通过椅旁设计和3D打印制作的数字化栅栏式微种植钉导板在微种植钉植入术中的应用效果。方法:选取需行微种植钉植入的患者15例,术前拍摄口腔颌面部锥形束CT(cone beam computed tomography,CBCT),使用数字化口内扫描仪获得口扫图像,应用3Shape Dental System软件将两者图像拟合后设计导环。导环文件和口扫图像导入Plasty CAD软件,完成栅栏式导板设计。使用椅旁3D打印设备打印导板,光固化后打磨抛光和试戴。在导板引导下植入微种植钉30颗。拍摄术后CBCT,与术前CBCT图像拟合,测量微种植钉实际植入与设计植入的偏差,包括角度偏差和位置偏差,进行精确度分析。测量实际植入的微种植钉与天然牙根的最小间距,评价植入安全性。观察微种植钉植入术后3个月内的固位情况,评价其稳定性。结果:数字化栅栏式导板引导下微种植钉实际植入与设计植入的角度偏差值为(1.25±3.41)°,微种植钉颈部、根部位置与设计植入的偏差值分别为(0.17±0.46)mm、(0.13±0.41)mm,两者比较差异无统计学意义(P>0.05)。30颗微种植钉与牙根均无接触,安全性Ⅰ级占86.67%,Ⅱ级占13.33%,无Ⅲ级病例。术后3个月内微种植钉均无松动记录,稳固率为100%。结论:数字化栅栏式微种植钉导板能有效提升植入的精确度、安全性和稳定性,椅旁设计和3D打印的制作方式便捷可靠,缩短了治疗周期,具有重要的应用价值。