scholarly journals Determination of Acceptable Quality Limit for Casting of A356 Aluminium Alloy: Supplier’s Quality Index (SQI)

Metals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 957 ◽  
Author(s):  
Erzi ◽  
Gürsoy ◽  
Yüksel ◽  
Colak ◽  
Dispinar
Keyword(s):  
Quality Index ◽  
Mechanical Tests ◽  
Starting Material ◽  
Raw Material ◽  
Chemical Compositions ◽  
Acceptable Quality ◽  
Low Pressure Die Casting ◽  
Pressure Die Casting

Aluminium and its alloys have been widely used in the automotive industry for some time and A356 is one of the most popular aluminium alloys today in the sector. It contains approximately 7 wt.% Si and 0.3 wt.% Mg. Due to the defects that may be present in the cast parts, expected mechanical properties may not be reached and this alloy may perform in service under its potential. In a low pressure die casting, several precautions have to be taken in order to produce high quality and defect-free castings. Temperature of casting and the schemical composition of the melt is recorded continuously. Die temperature, pressure levels and their durations are optimized; degassing and fluxing operations are performed. Yet, regardless of the precautions, there could still be rejected parts. It is becoming clear that a good quality raw material is one of the most underrated points of the industry and that the starting material has a great effect on the final product and it should be taken in to account more seriously. Therefore, regarding the first rule of Campbell’s 10 Rules of Casting, in this study, the quality of the starting material of supply chains for a wheel manufacturer was investigated. Chemical compositions were compared, fluidity tests, mechanical tests and bifilm indexes of these various sources and ingots were measured and a final quality index was proposed to create a reference for the quantification of quality of supplier’s ingots. This new index was compared with the rejection rates.

Study on the Processing Technology of ERTI-7 Titanium Wire Based on AHP-PQ Model

2011 ◽  
Vol 120 ◽  
pp. 230-234
Author(s):  
Cheng Zhang ◽  
Rong Mo ◽  
Hai Cheng Yang ◽  
Xiao Jun Wang ◽  
Xiao Rui Lu
Keyword(s):  
Processing Technology ◽  
Raw Material ◽  
Machining Process ◽  
Chemical Compositions ◽  
Surface Machining ◽  
Good Surface ◽  
Titanium Wire ◽  
Selection Of

This article determines the main factors influencing the quality of ERTi-7 titanium wire through building AHP-PQ model: processing technology. under the circumstance of instable quality of ERTi-7 titanium wire in international market. Through the selection of raw material, feeding material evenly during melting, control of melting times and the determination of surface machining process, the inhomogeneity of chemical compositions of ERTi-7 and the corresponding removal method are studied. The results show that it is easier to obtain ingot with good surface and fine structure using triple melting without increasing the content of Pd element, and then going through non-oxidation roller-die drawing process, we will obtain qualified titanium wire with good surface and also conforming to the request of AWS A5.16/A5.16M:2007.

scholarly journals pH of exudate test in the physiological quality of crambe seeds

2016 ◽  
Vol 46 (6) ◽  
pp. 1014-1018 ◽  
Author(s):  
Charline Zaratin Alves ◽  
Lennis Afraire Rodrigues ◽  
Carlos Henrique Queiroz Rego ◽  
Josué Bispo da Silva
Keyword(s):  
Pearson Correlation ◽  
Raw Material ◽  
Mean Values ◽  
Tukey Test ◽  
Physiological Quality ◽  
The Subject ◽  
The Mean ◽  
C 30

ABSTRACT: Crambe is a rapeseed with high oil content and can be used as a winter cover or as a source of raw material for the production of biodiesel, however espite the growing interest in the culture, research on the subject is still incipient, especially concerning the seed production and analysis technology. The purpose of this study is to evaluate the physiological quality of crambe seeds, 'FMS Brilhante' cultivar, by testing the pH of exudate. Five seed lots were submitted to the determination of water content and the tests of germination and vigor (first count, emergence and tetrazolium). In the conduction of pH exudate test, temperatures (25 and 30oC), and periods of seed imbibition in water (15, 30 and 45 minutes) were tested. The experiment was conducted in a completely randomized manner, with four replicates, and the mean values were compared by the Tukey test at 5% probability; Pearson correlation between the pH of the exudate and initial tests was also made. Testing the pH of exudate is promising for separating lots of crambe seeds and the following combinations of 25°C/30 minutes or 30°C/45 minutes can be used.

scholarly journals The formulation of white oyster mushroom (Pleurotus ostreatus (Jacq.) P. Kumm) as natural flavoring and the quality test in temperature and drying time variations

2021 ◽  
Vol 922 (1) ◽  
pp. 012054
Author(s):  
S Sadli ◽  
S Saleha ◽  
D Fiana ◽  
M Misrahanum
Keyword(s):  
Low Temperatures ◽  
Pleurotus Ostreatus ◽  
Raw Material ◽  
Quality Test ◽  
Drying Time ◽  
Test Parameters ◽  
Time Variations ◽  
Oyster Mushrooms

Abstract The determination of the drying temperature and time depends to the characteristic of the mushrooms. The use of low temperatures causes the mushrooms to not fully ripen, if the temperature is too high the protein contained in the mushrooms can be denatured and drying too long will change the color of the mushrooms to brown and change its taste. Research on the processing of oyster mushrooms as a raw material for natural flavoring, it is carried out to determine the quality flavoring produced through a descriptive test of the test parameters, color, aroma, taste and texture by variations the temperature 60¼C and 70¼C in drying time 6, 7 and 8 hours. The results of descriptive test of the sixth color of the flavoring have an intensity of attractive colors are light brown; Descriptive taste test F1, F2 and F5 have the intensity of the taste is rather pleasant, the umami is weak while F3, F4 and F6 have taste is quite good, umami tastes; Descriptive test of the six flavoring textures has a good intensity and; Descriptive test of the sixth aroma of flavoring has a slightly fragrant aroma intensity, the aroma of the material is not too smelly. The conclusion of the research is that temperature and drying time do not affect quality of color, aroma and texture. However, they affect the taste where the temperature 60¼C for 8 hours and a temperature of 70¼C within 7 and 8 hours have enough delicious taste with tasteful umami.

The issue of "oil shrinkage" during the compounding of oils in the processes of production, collection, preparation and transportation of hydrocarbon raw materials

2021 ◽  
pp. 104-113
Author(s):  
O. P. Deryugina ◽  
E. A. Trapeznikov
Keyword(s):  
Raw Materials ◽  
Raw Material ◽  
Colloidal System ◽  
Main Pipelines ◽  
Different Types ◽  
Preliminary Study ◽  
The Stability ◽  
Mixed Oil

The article discusses the issue of industrial compounding, which improves the quality of the raw materials supplied to the main pipelines. Compounding from "to compound" (English) - to mix. When mixing different types of oil obtained, "incompatibility" is possible, which is expressed in the precipitation of a solid sediment and violation of the stability of the colloidal system and due to the differing properties of oils. Attention to this problem is due to the tightening of requirements for the quality of raw materials that must comply with modern standards. The article discusses the causes of the problem of "incompatibility" of oil during compounding and effective ways of solving it, substantiates the need for a preliminary study of the properties of mixed oil in order to identify possible incompatibility of various types of oil. The standard tests for determination of incompatibility indices characterizing the ability of raw materials to mix are considered. The article substantiates the need to develop methods for diagnosing the incompatibility of oils as the most important task of modern chemical science, the solution of which will improve the quality of the raw material obtained and solve many technological problems in the compounding process.

The Simulation of Heat and Vapour Transfer Trough Fibrous Materials

2010 ◽  
Vol 297-301 ◽  
pp. 1205-1209 ◽  
Author(s):  
Ivana Salopek Čubrić ◽  
Zenun Skenderi
Keyword(s):  
Structural Parameters ◽  
Basic Structure ◽  
Raw Material ◽  
Fibrous Materials ◽  
Vapour Permeability ◽  
Physiological Processes ◽  
Repeat Units ◽  
Materials Used

The heat and water vapour transmitting properties of fibrous materials are important factors that affect the clothing's comfort as well as the quality of special functional clothing that is worn in extreme environmental conditions. The paper introduces advanced system for the simulation of physiological processes that appear next to the human skin. Its use enables the measurement of heat and vapour transfer trough fibrous structures, as well as determination of vapour permeability and permeability index. The experiments reported here refer to the measurement of a number of fibrous materials used for the next-to-skin wear. For the measurement have been produced materials that differ either in their structure or raw material in order to observe the influences of different parameters to the transfer properties. The transfer trough fibrous materials is mainly affected by its structure that comprises of a repeat units with cellular geometry containing air pores, yarns that form basic structure and intersection points of two or more yarns. Therefore, the structure of materials is also investigated and described by means of fabric moduli. Dynamics of heat and vapour transfer is observed through the experimentally obtained data and the influence of a number of structural parameters is discussed. The statistical methods are used to qualify the effects of investigated variables on the heat and vapour resistance.

scholarly journals Insight into the Way the Content of Biologically Active Compounds in Meadowsweet Inflorescences (Filipendula ulmaria (L.) Maxim.) Is Shaped by Phytosociological Habitats

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5172
Author(s):  
Kinga Stawarczyk ◽  
Aleksandra Chrupek ◽  
Agnieszka Sękara ◽  
Michał Gostkowski ◽  
Małgorzata Karbarz
Keyword(s):  
Genetic Material ◽  
Biologically Active ◽  
Raw Material ◽  
Total Phenolic ◽  
Filipendula Ulmaria ◽  
Biochemical Compounds ◽  
Active Chemical ◽  
Insight Into

A collection of herbs from the natural environment remains not only a source of raw material but also provides evidence of chemical differentiation of the local populations. This work aimed at performing a phytosociological analysis of seven different stands of meadowsweet (Filipendula ulmaria (L.) Maxim.) occurrence. A determination of total phenolic compounds and salicylates and the antioxidant activity of dried meadowsweet inflorescences (Flos ulmariae) was also performed. Active chemical compounds in F. ulmaria inflorescences were related to chemotype and diversified between investigated populations. Geographical distance and variation in phytosociological locations affected chemical composition in different ways, shaping the content of biochemical compounds crucial for herbal material quality. The obtained results can be a valuable indicator for Nexo and Baligród populations, which are good genetic material for research, breeding, and cultivation due to their biochemical composition, especially with respect to salicylates, as major compounds of determining market quality of Flos ulmariae.

scholarly journals Mejoramiento de la calidad en la recepción de materias primas, mediante la implementación de un plan de muestreo por variables

2020 ◽  
pp. 19-31
Author(s):  
Fernando Hernández-Benito ◽  
Martín González-Sóbal ◽  
Montserrat Gómez-Márquez ◽  
Miguel Ángel Solís-Jiménez
Keyword(s):  
Sampling Plan ◽  
Raw Material ◽  
Quality Level ◽  
Current State ◽  
Acceptable Quality ◽  
Inspection Process ◽  
Acceptable Quality Level ◽  
Action Strategies ◽  
Process Methodology

Objective: To guarantee the adequate inspection of raw material and packaging material by the inspection-receipt area by implementing an effective sampling plan that allows reducing the percentage of defective raw material and its impact on the production process. Methodology: It is based on the continuous improvement cycle (PHVA) within which a diagnosis is made to determine the current state of the inspection process, which will allow defining new action strategies aimed at standardizing the inspection process, through the implementation of a sampling plan by variables based on the MIL-STD 414 standard, once implemented, this process is documented, at the same time the integration of suppliers is carried out, through periodic evaluations in order to know the dynamics of the new inspection process and work only with those suppliers committed to the quality of their inputs. Contribution: Reduction of the percentage of defective raw material, from 21% to 13%, which means an acceptable quality level of the materials of 87%.

scholarly journals An Inventory Model with Price and Quality Dependent Demand Where Some Items Produced Are Defective

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Tapan Kumar Datta
Keyword(s):  
Quality Index ◽  
Unit Price ◽  
Model Parameters ◽  
Selling Price ◽  
Defective Items ◽  
Joint Determination ◽  
Demand Rate ◽  
Dependent Demand

This paper analyzes an inventory system for joint determination of product quality and selling price where a fraction of items produced are defective. It is assumed that only a fraction of defective items can be repaired/reworked. The demand rate depends upon both the quality and the selling price of the product. The production rate, unit price, and carrying cost depend upon the quality of the items produced. Quality index is used to determine the quality of the product. An algorithm is provided to solve the model with given values of model parameters. Sensitivity analysis has also been performed.

Quality Evaluation of Jajrood River (IRAN) by Quality Indices Methods

2013 ◽  
Vol 650 ◽  
pp. 652-657
Author(s):  
Mohammad Mirzaei ◽  
Hamed Hasanian
Keyword(s):  
Water Quality ◽  
Quality Index ◽  
Quality Indices ◽  
Wet Season ◽  
Management Actions ◽  
Acceptable Quality ◽  
Negative Effect ◽  
Dry Seasons ◽  
Better Than

This Regular evaluation and analysis of river quality helps accurate management to reach acceptable quality. In this study, water quality indices (WQI) method applied to evaluate quality of Jajrood River which is one of the main sources of Tehran drinking water. It helps to subsidize management actions in Jajrood watershed. Sampling carried out for 9 years during 2001-2010 in 10 stations along the river in wet and dry stations to identify water quality and the main source of pollution. Results show water quality in all stations classifies as medium according to National Sanitation Foundation (NSF) and water quality index in wet season is better than the corresponding value in dry seasons. Entrance of pollution during the upstream of Latian Dam (especially in populated centers) has negative effect on the water quality, however river has a good natural attenuation capacity, therefore quality index of river in the main inlet of Latian dam (Lashkarak Bridge) classifies as medium. Collecting wastewater at the populated centers and developing soil conservation and controlling erosion at the upstream of watershed can effectively improve the water quality of river.

Distribution of the Quality Index in AlSiMg Castings Produced by Different Processes: Reality vs Prediction

2011 ◽  
Vol 690 ◽  
pp. 238-241
Author(s):  
Franco Chiesa ◽  
Nicolas Giguère ◽  
Bernard Duchesne
Keyword(s):  
North America ◽  
Quality Index ◽  
Low Pressure ◽  
Metallographic Examination ◽  
Race Car ◽  
Foundry Alloys ◽  
Predicted Values ◽  
Pressure Die Casting

The Quality Index is a useful tool allowing to assess the metallurgical quality of aluminium AlSiMg foundry alloys (AlSi7Mg03/AlSi7Mg06, or A356/357 in North America). Its value, calculated from the ultimate tensile strength and elongation, increases with the metallurgical quality of the casting, i.e. with finer dendrites, lower microporosity, lower iron content and cleaner metal. This Quality Index does not depend on the degree of temper applied during the heat treatment (aging time and temperature). This paper will briefly explain how solidification modeling can provide the local value of the Quality Index, via the secondary dendrite arm spacing and level of microporisity calculated from the predicted values of the local solidification time and solidus velocity. The validity of the predictions has been assessed against the properties of tensile specimens excised from parts of different geometries produced by a variety of casting processes, as reported in the literature. The case study of a race car bell housing poured by two processes, namely gravity sand casting (GSC) and low pressure die casting (LPDC, or LPPM for Low Pressure Permanent Mold in North America), will be the focus of the present paper. The Quality Index has been measured and predicted at 3 locations in the castings after a T6 temper was applied which resulted in a minimum elongation of 5% for both the GDC and LPDC bell housings. Metallographic examination and image analysis allowed to quantify the superior metallurgical quality of the LPDC housings when compared to their GDC competitors.

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