Influence of part dimension on ageing of injection moulded thermoplastic materials: exemplary studies on amorphous polycarbonate

Author(s):  
Steve Meister
Keyword(s):  
2013 ◽  
Vol 389 ◽  
pp. 953-956
Author(s):  
Xian Zhang Feng ◽  
Yan Mei Cui ◽  
Li Hong Yu ◽  
Zhi Qiang Jiang ◽  
Jun Wei Cheng ◽  
...  

In order to the integrated design of the geometric parameters and drawing the pulley parts, based on R & D platform of the VBA with the CAD software, hence after analyzing the selection belt type, determine the reference diameter of the belt pulley, choosing length and the amount of the belt, and designing and drawing the pulley parts, in which include the drawing the tooth of v belt pulley, chamfers and grooves, keyway, hatches, and part dimension, etc. Conventional belt drive system is successfully developed. The design results show that the program is running smoothly, the result is correct with the friendly interface, it can provide a convenient tool to rapidly design of project for the belt drive system.


2010 ◽  
Vol 102-104 ◽  
pp. 277-282
Author(s):  
Xiao Ming Wu

The double(unilateral)index subjection function model for part dimensional test is constructed, the checkout limit range is partitioned by process capability index, then distributing law of measure dimension is used to estimate the confidence level about part dimentional test and fits test by fuzzy theory. Finally an example is given and the proposed method proves to be feasible and valid.


Author(s):  
Ratnakar Ambade ◽  
Ankit Jaiswal

Background: It is well understood that distal femoral and proximal tibia scale is lower in case of the Asian than that of their western counterparts. Because of the Asian population's comparatively smaller structure and stature, many surgeons claim that imported implants may not be well fitted for Asian origin patients, mainly based on Western morphometry. It is very likely that an overweight section will be used in many Asian centres in most operations, resulting in low results of the procedure of the implant. For joint substitution of distal femur, careful positioning of fitted implants as well as balancing of underlying soft tissues is important. It is also important to use incredibly complex surgical procedures. To retain its usual functional motion spectrum, use of a suitable femoral part dimension is necessary. Furthermore, owing to a discrepancy between the size of the prosthesis and the bone, there could be a host of serious issues. Objectives: To calculate the anthropometric distal femur parameter and determine the distal femur variations on the right and left side of the morph metric measurement and to evaluate dimension of current TKA as related to Indian population. Methodology: This study included visiting the out patients Department of Orthopedics, at AVBRH in the age group 30-50 year during the period of June-2020 to April-2023 with sample size of 50 patients. Detailed history and clinical review will be taken, including age, sex, socio-economic background, type of employment. In all patients involved in the study in Orthopedic OPD, thorough radiological assessment of all the knee joints will be performed. The radiological test and various anthropometrics will include knee joint Simple X-ray and CT-Scan. Expected Results: We expect that from our results, anthropometric measurements of Indian population may differ from other literatures.


2017 ◽  
Vol 5 ◽  
pp. 39-48 ◽  
Author(s):  
Nikolai Kobasko

In the paper transient nucleate boiling process is widely discussed. It’s unknown previously and investigated by author characteristics create a basis for designing of new technologies which allow receiving super strengthened materials. Obtained results are also used for appropriate software development to be widely applied for control of technological processes and cooling recipes design. A possibility of transition from real heat transfer coefficients (HTCs) to effective HTCs is discussed in the paper too. It is shown that core temperature of steel parts at the end of transient nucleate boiling (self-regulated thermal process (SRTP)) is a linear function of a part dimension when convective heat transfer coefficient during quenching in liquid media is fixed. Also, it is shown that effective Kondrtajev number Kn is a function of part size and convection intensity and is almost linear function for large sizes of steel parts. Surface temperature at the beginning of self-regulated thermal process and at its end is calculated depending on size and intensity of cooling. Based on obtained new results, it is possible to design DATABASE for liquid quenchants using standard Inconel 600 probe combined with the Liscic/Petrofer probe. Obtained results can be useful for engineers and software designers.


Author(s):  
Jami J. Shah ◽  
Yong Yan

Abstract This paper describes the development of a dimension model for use in both design and process planning. The model also facilitates the converting of dimensions and tolerances (D&T) from design models to machining features extracted automatically by feature recognition systems. The model is based on relative degrees of freedom of geometric entities, such as edges and faces of a part. Dimension graphs are created based on the degrees of freedom. The model allows dimension specification, dimension scheme modification, and dimension scheme validation. A methodology to automatically determine the dimensions of machining volumes obtained by volume decomposition is also described.


Author(s):  
Juan Du ◽  
Hao Yan ◽  
Tzyy-Shuh Chang ◽  
Jianjun Shi

Abstract Advanced 3D scanning technology has been widely used in many industries to collect the massive point cloud data of artifacts for part dimension measurement and shape analysis. Though point cloud data also has product surface quality information, it is challenging to conduct effective surface anomaly classification due to the complex data representation, high-dimensionality, and inconsistent size of the 3D point cloud data within each sample. To deal with these challenges, this paper proposes a tensor voting based approach for anomaly classification of artifact surfaces. A case study based on 3D scanned data obtained from a manufacturing plant shows the effectiveness of the proposed method.


1984 ◽  
Vol 106 (4) ◽  
pp. 489-493
Author(s):  
J. K. Davidson ◽  
R. S. Ferrel

Congruent conical pilots can be used to configure the contacting surfaces of coaxially assembled rigid cylindrical parts where assembly integrity is obtained by an axial clamping load and where externally applied constraints occur only at the ends of the assembly. The relative motion for mating parts is developed for parts of arbitrary length. A method for optimal geometric design of the pilots is presented for the special conditions that all the parts be of the same length and that the assembly contain the minimum number of parts permissible for instability to occur. Application of the optimal design method achieves the maximum stability in the presence of a lateral destabilizing load. For each part dimension, the optimal value is at a domain limit.


2011 ◽  
Vol 103 ◽  
pp. 194-198
Author(s):  
Ji Gang Wu ◽  
Kuan Fang He ◽  
Bin Qin

Aiming at the edge detection of thin sheet part dimension inspection system based on machine vision, a contrast research on edge detection is investigated. The Gaussian blurred simulation image and thin sheet part image are took as evaluation images, and the edge detection are done with Roberts operator, Sobel operator, Prewitt operator, Kirsch operator, Laplacian operator, LOG operator and mathematical morphology edge detection method. The results of edge detection are analyzed deeply, and the edge location accuracy, noise resisting ability and calculation time of each algorithm are compared. The single-pixel width connected contour is acquired with mathematical morphology edge detection method, the detection time are 0.0521 second and 0.457 second respectively. It is appropriate that taking the mathematical morphology edge detection method as the edge detection method of thin sheet part dimension inspection system based on machine vision.


1984 ◽  
Vol 106 (4) ◽  
pp. 494-497
Author(s):  
R. S. Ferrel ◽  
J. K. Davidson

Congruent conical pilots can be used to configure the contacting surfaces of coaxially assembled rigid cylindrical parts where assembly integrity is obtained by an axial clamping load and where externally applied constraints occur only at the ends of the assembly. The relative motion for mating parts is developed for parts of arbitrary length. A method for optimal geometric design of the pilots is presented for the special conditions that all the parts be of the same length and that the assembly contain the minimum number of parts permissible for instability to occur. Application of the optimal design method achieves the maximum stability in the presence of a lateral destabilizing load. For each part dimension, the optimal value is at a domain limit.


Sign in / Sign up

Export Citation Format

Share Document