Pre-Deformed Design of Optical Lenses with Reverse Engineering and Virtual Manufacturing

2014 ◽  
Vol 599-601 ◽  
pp. 391-395
Author(s):  
Wei Zhen Li ◽  
Song Hao Wang
Keyword(s):  
Reverse Engineering ◽  
Virtual Manufacturing ◽  
Maximum Deviation ◽  
Engineering Technology ◽  
Optical Lens ◽  
Accuracy Requirement ◽  
Injection Process ◽  
Conventional Procedure ◽  
Modern Engineering ◽  
Plastic Injection

For higher geometrical accuracy requirement of optical lens, much research has been conducted either by changing the injection process parameters or changing the material of the mold or the mold manufacturing process. Although some degree of improvements was achieved, those were occasional but not-repeatable. One conventional procedure has been: the injection mold core must be polished several times to obtain qualified lens product in preproduction trial, very uneconomical and inefficient. In this paper, modern engineering tools were applied to simplify the correction process in optical lens fabrication. Combining virtual manufacturing with reverse engineering technology, the method was demonstrated very powerful. For the optical lens of 70x29.1mm in this research, the maximum deviation from the flatness after regular plastic injection molding was 0.208mm. While with combined technology of VM and RE the error was reduced to 0.008mm only by once iteration with an improvement of 96.15%. Not only the technology could be extended to larger or more challenging lens fabrication, it could also be applied to curved surfaces. This is really great tool to achieve higher quality optical lens production with much lower expending in labor and funding.

A Framework of a Continuous Injection Direct Rolling Process for Precision Manufacturing Plastic Plates with Patterned Microstructures

2014 ◽  
Vol 625 ◽  
pp. 489-495
Author(s):  
Ling Bao Kong ◽  
Ji Bin Li ◽  
Chi Fai Cheung ◽  
Yan Lou ◽  
Chang Sheng Wang ◽  
...  
Keyword(s):  
Research Work ◽  
Rolling Process ◽  
Plastic Plate ◽  
Precision Manufacturing ◽  
Injection Nozzle ◽  
Injection Process ◽  
Ultra Precision ◽  
Direct Rolling ◽  
Continuous Injection ◽  
Plastic Injection

This paper presents an integrated roller embossing process named Continuous Injection Direct Rolling (CIDR) process. The CIDR process is similar to Continue Casting Direct Rolling (CCDR) process for metal material. The process consists of Plastic Injection Module, Injection Nozzle, Precision Rolling Module, and Automatic Coiling Module. In the proposed CIDR process, the plastic plate with microstructured pattern is produced by the integrated injection and rolling process, which is different from the current rolling or plastic injection process. Some key technologies including injection nozzle design, roller design, roller coupling, and ultra-precision machining of rollers, are presented. An on-machine measurement method is also proposed and presented to avoid the incontinence and errors caused by disassembling the roller workpiece for off-line measurement. The results of the pilot study are also discussed. The research work provides an enabling solution for precision manufacturing plastic plate and film with microstructured patterns.

scholarly journals Processing and Testing of Reinforced PA66 Based Composites

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7299
Author(s):  
Alejandro Pereira ◽  
Alberto Tielas ◽  
Teresa Prado ◽  
Maria Fenollera ◽  
José Antonio Pérez
Keyword(s):  
Composite Materials ◽  
Glass Fibre ◽  
High Rate ◽  
Injection Process ◽  
Production Processes ◽  
Short Glass Fibre ◽  
The Matrix ◽  
Plastic Injection ◽  
Short Glass ◽  
Resistance Tests

The new requirements in different sectors, such as aerospace, automotive and construction, for lightweight materials have led to an increase in demand for composite materials suitable for use in high rate production processes, such as plastic injection. This makes it necessary to look for matrices and reinforcements that, in addition to being compatible with each other, are also compatible with the injection process. It is in this area of research where the work presented here arises. To meet the two requirements mentioned above, this study contemplates a battery of composite materials obtained by combining PA66 and fiberglass, in different proportions and configuration, both for the preparation of the matrix and for reinforcement. For the elaboration of the matrix, two options have been evaluated, PA66 and PA66 reinforced at 35% with short glass fibre. To obtain reinforcement, six different options have been evaluated; two conventional fiberglass fabrics (each with different density) and four hybrid fabrics obtained from the previous ones by adding PA66 in different configurations (two over-stitched fabrics and two other fabrics). The different composite materials obtained were validated by means of the corresponding adhesion, peeling and resistance tests.

scholarly journals Social smile reproducibility using 3-D stereophotogrammetry and reverse engineering technology

2016 ◽  
Vol 86 (3) ◽  
pp. 448-455 ◽  
Author(s):  
Furkan Dindaroğlu ◽  
Gökhan Serhat Duran ◽  
Serkan Görgülü ◽  
Enver Yetkiner
Keyword(s):  
Reverse Engineering ◽  
Individual Variability ◽  
Reference Image ◽  
Mean Deviation ◽  
Single Image ◽  
Engineering Technology ◽  
Deviation Analysis ◽  
The Social ◽  
The Mean ◽  
Clinically Significant

ABSTRACT Objective:  To assess the range of social smile reproducibility using 3-D stereophotogrammetry and reverse engineering technology. Materials and Methods:  Social smile images of white adolescents (N  =  15, mean age  =  15.4 ±1.5 years; range  =  14–17 years) were obtained using 3dMDFlex (3dMD, Atlanta, Ga). Each participant was asked to produce 16 social smiles at 3-minute intervals. All images were obtained in natural head position. Alignment of images, segmentation of smile area, and 3-D deviation analysis were carried out using Geomagic Control software (3D Systems Inc, Cary, NC). A single image was taken as a reference, and the remaining 15 images were compared with the reference image to evaluate positive and negative deviations. The differences between the mean deviation limits of participants with the highest and the lowest deviations and the total mean deviations were evaluated using Bland-Altman Plots. Results:  Minimum and maximum deviations of a single image from the reference image were 0.34 and 2.69 mm, respectively. Lowest deviation between two images was within 0.5 mm and 1.54 mm among all participants (mean, 0.96 ± 0.21 mm), and the highest deviation was between 0.41 mm and 2.69 mm (mean, 1.53 ± 0.46 mm). For a single patient, when all alignments were considered together, the mean deviation was between 0.32 ± 0.10 mm and 0.59 ± 0.24 mm. Mean deviation for one image was between 0.14 and 1.21 mm. Conclusions:  The range of reproducibility of the social smile presented individual variability, but this variation was not clinically significant or detectable under routine clinical observation.

Energy and GHG Emissions Assessment in a Plastic Injection Process at Machine Component Level: A Case Study of ABS Plastic Part Produced in a Hybrid Injection Molding Machine

2017 ◽  
Author(s):  
Javier Ávila ◽  
Vicente Borja ◽  
Marcelo López-Parra ◽  
Alejandro C. Ramírez-Reivich
Keyword(s):  
Injection Molding ◽  
Ghg Emissions ◽  
Energy Usage ◽  
Molding Machine ◽  
Injection Molding Machine ◽  
Energy Assessment ◽  
Injection Process ◽  
Hybrid Injection ◽  
Plastic Injection

In this article a GHG and energy analysis for the plastic injection process of an ABS medium sized injected part carried out in a hybrid injection molding machine is reported. A power consumption process pattern for an ABS medium-size part is defined as well as the energy usage of components, the energy used for the injection process is calculated for the injection cycle and for the process setup. The reported study includes a hybrid machine analysis working under an electric network that relies mainly on thermoelectric energy generation. The GHG emissions assessment was estimated using the 2015 emission factor applied for Mexico. The results provide new experimental data for ABS plastic injected parts in hybrid injection machines. This paper describes the outcomes of a GHG emissions and energy assessment for an ABS medium-sized injected part carried out in a HIMM at UNAM. The approach followed by the authors in this assessment was aimed at providing information about the energy usage and GHG emissions for the process and the part. The main contribution of this paper is the insight related to energy usage indicators in the process, the energy usage and the GHG emissions within components. The product used as a case study and the results of its GHG emissions and energy assessment are presented.

Product Reverse Engineering Based on Growth Design Process

2007 ◽  
Author(s):  
Kezheng Huang
Keyword(s):  
Reverse Engineering ◽  
Design Process ◽  
System Architecture ◽  
Conceptual Structure ◽  
Prototype System ◽  
Fixture Design ◽  
Engineering Technology ◽  
Key Techniques ◽  
Process Reconstruction ◽  
Structure And Design

Current reverse engineering approach is an effective way for technology progress of developing countries. Based on analysis of existing reverse engineering technology, a new concept of Product Reverse Engineering (PRE) is proposed and its theoretical framework is discussed first in this paper in order to extend its application from components to the overall product structure and design process. Then a brief introduction is made to the technical system architecture and key techniques for PRE, which include the rapid solid modeling, integrating with existing CAD systems through STEP file, assembly modeling for conceptual structure, and reverse design process reconstruction. Finally, a prototype system PRE-DARFAD is developed with initial verification by a fixture design example.

Research Based on Reverse Engineering Technology of Complex Structure Product

2015 ◽  
Vol 741 ◽  
pp. 806-809
Author(s):  
Ai Qin Lin ◽  
Yong Xi He
Keyword(s):  
Reverse Engineering ◽  
Point Cloud ◽  
Complex Structure ◽  
Laser Scanner ◽  
Complex Surface ◽  
Curved Surface ◽  
Quality Model ◽  
High Quality ◽  
Engineering Technology ◽  
Working Principle

Introduced reverse engineering technology and working principle. Researched reverse design process of the complex curved surface "spider". The data were collected by means of multiple scanning measuring with laser scanner. Used Geomagic Studio software for date point cloud processed of complex curved surface. Used UG software for surface reconstruction designed. Product reduction and improvement of the design were finished rapidly and high quality. Model of spider was printed with rapid prototyping technology. Compared with physical, the model’s reliability and accuracy were verified by reverse engineering design.Keywords: complex surface; reverse engineering technology; UG; Geomagic Studio software

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