The Effective Measures of Preventing Collapse Angle Problem in Polishing Plastic Mould

2012 ◽  
Vol 538-541 ◽  
pp. 1720-1723
Author(s):  
Yi Lei Ren ◽  
Hong Qi Lin
Keyword(s):  
Preventive Measures ◽  
Dimensional Accuracy ◽  
Machining Process ◽  
Mold Cavity ◽  
Cavity Surface ◽  
Plastic Model ◽  
Plastic Parts ◽  
Surface Angle ◽  
Plastic Mold

Plastic mold polished, in the mold cavity parting collapsed throwing angle appear, which seriously affect the dimensional accuracy and surface quality of the plastic parts, this article proposed two effective preventive measures: (1) cutting the model which having a same size as plastic model of the cavity at the parting surface, sticking the model and cavity parting with 502 glue together, within the required type of alignment, and then thrown together, polished finish will be a model to out; (2) in the plastic model cavity machining process, type in the mold cavity surface set aside allowance 0.5 ~ 1mm, polished until the cavity is completed, the surface of the cavity type 0.5 ~ 1mm rubbed off with a grinding allowance, it will ensure the cavity size and cavity to prevent the collapse of sub-surface angle at the phenomenon.

scholarly journals Analysis of the Performance of Drilling Operations for Improving Productivity

2021 ◽  
Author(s):  
Majid Tolouei-Rad ◽  
Muhammad Aamir
Keyword(s):  
High Speed ◽  
Cutting Tools ◽  
High Speed Steel ◽  
Dimensional Accuracy ◽  
Vital Role ◽  
Machining Process ◽  
Drilling Process ◽  
Single Shot ◽  
Drilling Operations

Drilling is a vital machining process for many industries. Automotive and aerospace industries are among those industries which produce millions of holes where productivity, quality, and precision of drilled holes plays a vital role in their success. Therefore, a proper selection of machine tools and equipment, cutting tools and parameters is detrimental in achieving the required dimensional accuracy and surface roughness. This subsequently helps industries achieving success and improving the service life of their products. This chapter provides an introduction to the drilling process in manufacturing industries which helps improve the quality and productivity of drilling operations on metallic materials. It explains the advantages of using multi-spindle heads to improve the productivity and quality of drilled holes. An analysis of the holes produced by a multi-spindle head on aluminum alloys Al2024, Al6061, and Al5083 is presented in comparison to traditional single shot drilling. Also the effects of using uncoated carbide and high speed steel tools for producing high-quality holes in the formation of built-up edges and burrs are investigated and discussed.

A Study on the Shrinkage Characteristics and Dimensional Accuracy of Cast Gears

1992 ◽  
Author(s):  
Jimmy Adjunta ◽  
Donald Houser
Keyword(s):  
Investment Casting ◽  
Coordinate Measuring Machine ◽  
Dimensional Accuracy ◽  
Machining Process ◽  
Spur Gears ◽  
Design Phase ◽  
Process Variables ◽  
Measuring Machine ◽  
Thickness Measurements

Abstract This paper is primarily concerned with the evaluation of the dimensional quality of spur gears produced by two casting processes, i. e., the investment casting and v-sand casting processes. The casting patterns used were designed by compensating for process shrinkage, and were manufactured using a flexible CNC gear machining process. A computer program, CASTGR, was written to facilitate the design phase of the patterns. The various gear configurations cast were inspected using an universal coordinate measuring machine. The geometry of the casting and pattern were correlated to verify the contraction characteristics of the gear castings. In an attempt to categorize the precision capabilities of the two casting processes, the spread of the deviations found for tooth thickness measurements and measurements along profiles and leads of the cast gears were examined. The observed effects of other process variables is also included.

Monitoring Quality of Components by Fuzzy Control Principle

1998 ◽  
Vol 05 (02) ◽  
pp. 133-145
Author(s):  
Henry Lau
Keyword(s):  
Expert System ◽  
Fuzzy Control ◽  
Fuzzy Inference ◽  
Dimensional Accuracy ◽  
Boolean Logic ◽  
Fuzzy Expert System ◽  
Fuzzy Variables ◽  
Plastic Parts ◽  
Control Principle

A fuzzy expert system uses fuzzy logic control,1 which is based on a "superset" of Boolean logic that has been extended to handle the concept of "partial truth." It replaces mathematical models with models that are built from a number of rules with fuzzy variables such as output temperature, and fuzzy terms such as extremely hot, fairly cold. A fuzzy expert system has been implemented in a plastic moulding shop in Australia for monitoring dimensional quality of output products. Because these plastic parts are used as assembly components for production of gear boxes, their dimensional accuracy is of utmost importance. This paper presents the implementation of this monitoring system adopting a graphical and non-mathematical approach, and examines the application of fuzzy control systems in quality control. Practical examples with descriptions of how the fuzzy rules are shown and the operations of the fuzzy inference engine are covered.

Typical errors and violations of biotechnics of artificial breeding of pacific salmon

2020 ◽  
pp. 13-23
Author(s):  
Ekaterina Grinberg
Keyword(s):  
Production Process ◽  
Preventive Measures ◽  
Pacific Salmon ◽  
Fish Farming ◽  
Important Condition ◽  
The Third ◽  
Fish Breeding ◽  
Artificial Breeding ◽  
Strict Compliance

In two parts of the article, more than 70 errors and violations of the Biotechnics of artificial breeding of Pacific salmon in salmon hatcheries are collected and summarized, which lead to an immediate or delayed deterioration of the quality of reared fry and a decrease in their survival rate. Deviations from the biological basis of fish farming are shown and possible consequences of such errors or violations are predicted. In the first part of the article (#7,2020) there were General errors (throughout the entire fish-breeding process), as well as violations of Biotechnics during the work with producers, collecting eggs and preparing them for incubation, in the second part-violations of Biotechnics during the incubation of eggs, holding pre-larvae, rearing and release of young. Their correction, prevention or minimization of consequences will significantly improve the quality of sexual products and offspring from producers, increase the linear and weight gain of juveniles during rearing, improve the coefficient of feed payment, reduce the time of rearing, improve the epizootic situation by developing immunity in fry and mobilizing other protective reactions of their body, significantly reduce waste at all stages of the production process, increasing survival by 10–15%. In conclusion, it is noted that the first and most important condition for an efficient salmon hatchery is the creation of optimal environmental conditions at each stage of the production process. The second condition is strict compliance with the Biotechnics of artificial salmon breeding and the complex of veterinary and sanitary, fish-breeding and meliorative and therapeutic and preventive measures. The third is the availability of competent specialists who regularly improve their skills in accredited Universities to implement, control and manage the first two conditions.

EFFICIENCY OF USING GENODIAGNOSTIC TEST IN ASSESSMENT OF PERINATAL INFECTION OF YOUNG ANIMALS IN PREVENTION OF LEUKEMIA OF CATTLE

2020 ◽  
Vol 1 (4) ◽  
pp. 450-455
Author(s):  
N.G. Kozyreva ◽  
◽  
I.Yu. Abashin ◽  
L.A. Ivanova ◽  
◽  
...  
Keyword(s):  
Dairy Products ◽  
Preventive Measures ◽  
Leukemia Virus ◽  
Genomic Analysis ◽  
Positive Trend ◽  
Infection Frequency ◽  
Perinatal Infection ◽  
Serological Method ◽  
Drinking Milk

This article presents the results of determining the level of perinatal infection of calves with the bovine leukemia virus at the age from birth to colostrum intake and 1-1.5 months after birth when drinking milk from healthy individuals, excluding the alimentary transmission route, with an infection frequency of 5.4% in the surveyed farm. Improvement of molecular diagnostics based on genomic analysis in the scheme of complex antiepizootic/recreational measures for bovine leukemia has been carried out in order to improve the quality of dairy products. As part of the implementation and improvement of the scheme of preventive measures, a positive trend was found, expressed in a tendency to a 3.6-fold decrease in the frequency of detection of BLV infection of young animals. In the course of work, the efficiency of the use of a gene diagnostic test - multiplex PCR-RT – as a tool for the specific prevention of bovine leukemia of calves in the early stages of the disease was shown: the relative diagnostic sensitivity of the PCR-RT technique is at a level not lower than that of the serological method and differs in the side of overestimation by 3.8 times.

scholarly journals Studies on the Occurrence of Viruses in Planting Material of Grapevines in Southwestern Germany

Viruses ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 248
Author(s):  
Noemi Messmer ◽  
Patricia Bohnert ◽  
Stefan Schumacher ◽  
René Fuchs
Keyword(s):  
Preventive Measures ◽  
Control Measures ◽  
Grapevine Fanleaf Virus ◽  
Arabis Mosaic Virus ◽  
Planting Material ◽  
General Decline ◽  
Grapevine Pinot Gris Virus ◽  
Propagation Material

Viral diseases in viticulture lead to annual losses in the quantity and quality of grape production. Since no direct control measures are available in practice, preventive measures are taken to keep the vines healthy. These include, for example, the testing of propagation material for viruses such as Arabis mosaic virus (ArMV), Grapevine fanleaf virus (GFLV) or Grapevine leafroll-associated virus 1 (GLRaV-1) and 3 (GLRaV-3). As long-term investigations have shown, GLRaV-1 (2.1%) occurs most frequently in southwestern German wine-growing regions, whereas GLRaV-3 (<0.1%) is almost never found. However, tests conducted over 12 years indicate that there is no general decline in virus-infected planting material. Thus, it can be assumed that a spread of the viruses via corresponding vectors still takes place unhindered. Beyond the examinations regulated within the German Wine Growing Ordinance, one-time tests were carried out on Grapevine Pinot gris virus (GPGV). This analysis showed that GPGV was found in 17.2% of the samples.

scholarly journals Metal Machining—Recent Advances, Applications, and Challenges

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 580
Author(s):  
Francisco J. G. Silva
Keyword(s):  
Surface Finish ◽  
Manufacturing Process ◽  
Dimensional Accuracy ◽  
Machining Process ◽  
High Dimensional ◽  
Manufacturing Processes ◽  
Recent Advances ◽  
Metal Machining ◽  
Rapid Manufacture

Though new manufacturing processes that revolutionize the landscape regarding the rapid manufacture of parts have recently emerged, the machining process remains alive and up-to-date in this context, always presenting itself as a manufacturing process with several variants and allowing for high dimensional accuracy and high levels of surface finish [...]

Multi-objective optimization of injection-molded plastic parts using entropy weight, random forest, and genetic algorithm methods

2020 ◽  
Vol 40 (4) ◽  
pp. 360-371
Author(s):  
Yanli Cao ◽  
Xiying Fan ◽  
Yonghuan Guo ◽  
Sai Li ◽  
Haiyue Huang
Keyword(s):  
Genetic Algorithm ◽  
Random Forest ◽  
Regression Model ◽  
Process Parameters ◽  
Multi Objective Optimization ◽  
Entropy Weight ◽  
Multi Objective ◽  
Injection Molded ◽  
Plastic Parts

AbstractThe qualities of injection-molded parts are affected by process parameters. Warpage and volume shrinkage are two typical defects. Moreover, insufficient or excessively large clamping force also affects the quality of parts and the cost of the process. An experiment based on the orthogonal design was conducted to minimize the above defects. Moldflow software was used to simulate the injection process of each experiment. The entropy weight was used to determine the weight of each index, the comprehensive evaluation value was calculated, and multi-objective optimization was transformed into single-objective optimization. A regression model was established by the random forest (RF) algorithm. To further illustrate the reliability and accuracy of the model, back-propagation neural network and kriging models were taken as comparative algorithms. The results showed that the error of RF was the smallest and its performance was the best. Finally, genetic algorithm was used to search for the minimum of the regression model established by RF. The optimal parameters were found to improve the quality of plastic parts and reduce the energy consumption. The plastic parts manufactured by the optimal process parameters showed good quality and met the requirements of production.

FEA-Methodology for the Prediction of Aluminium Thin Walled Part Deformation in Dry Milling Operations

2011 ◽  
Vol 223 ◽  
pp. 662-670 ◽  
Author(s):  
Hendrik Puls ◽  
Fritz Klocke ◽  
Dieter Lung ◽  
Ralf Schlosser ◽  
Peter Frank ◽  
...  
Keyword(s):  
Mechanical Load ◽  
Machining Process ◽  
Dry Milling ◽  
Collaborative Project ◽  
Power Train ◽  
Automotive Engine ◽  
Milling Operations ◽  
Thin Walled ◽  
The Eu

The presented work is a part of the EU integrated and collaborative project “Aligning, Holding and Fixing Flexible and Difficult to Handle Components” (AFFIX). The deformation of thin-walled components, caused by a thermo-mechanical load in the machining process, is a common challenge in manufacturing automotive engine heads and gearboxes. Geometrical tolerances like flatness are strongly affected by the thermo-mechanical process loads, and therefore cause production scraps and serious engine faults in case of undetected defects. To avoid long process setup times, a methodology has been developed to calculate the resulting part flatness. Based on the developed methodology a clamping strategy has been identified which minimises the resulting part deformation in milling operations and thus ensures the accuracy and quality of thin-walled aluminum power train parts.

RESULTS OF THE STUDY OF PUBLIC SATISFACTION ABOUT THEAVAILABILITY AND QUALITY OF THE DRUG SUPPLY SYSTEM IN RUSSIA

2021 ◽  
Vol 8 (4) ◽  
pp. 5-12
Author(s):  
E.A. Telnova ◽  
A.V. Belova ◽  
A.A. Zagoruichenko
Keyword(s):  
Preventive Measures ◽  
Health Management ◽  
Healthy Lifestyle ◽  
Age Groups ◽  
Supply System ◽  
Public Confidence ◽  
Drug Supply ◽  
Social Significance ◽  
Sociological Study

The article analyzes the results of monitoring the availability and quality of the drug supply system among the population of various age groups and financial situation. The purpose of this study is to study the satisfaction of citizens in the drug supply system in Russia and to build a medical and social portrait of the patient, which was developed based on the analysis of the results of a sociological survey conducted in dynamics for 2019-2021. In the course of the research, such methods as: sociological, study and generalization of experience, analytical, methods of descriptive statistics were used. The results of the sociological study indicate the need for additional work to improve the availability and quality of LLR and the level of awareness of patients about the system of drug reimbursement. The obtained data can be used for health management bodies at various hierarchical levels, confirm the special social significance of solving this problem and the need to introduce preventive measures to involve patients in healthy lifestyle, increase public confidence in domestic drugs.

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