According to the analysis of the current state of the knowledge shows that there is little information on the process of phase transformations
that occur during the cooling Cu-Al-Fe-Ni hypo-eutectoid bronzes with additions of Cr, Mo and/or W, made additions individually
or together, for the determination of: the type of crystallizing phases, crystallizing phases, order and place of their nucleation.
On the basis of recorded using thermal and derivative analysis of thermal effects phases crystallization or their systems, analysis of the
microstructure formed during crystallization - observed on the metallographic specimen casting ATD10-PŁ probe, analysis of the existing
phase equilibrium diagrams forming elements tested Cu-Al-Fe-Ni bronze, with additions of Cr, Mo, W and/or Si developed an original
model of crystallization and phase transformation in the solid state, the casting of high quality Cu-Al-Fe-Ni bronze comprising: crystallizing
type phase, crystallizing phase sequence, place of nucleation.
The influence of aluminium added in amounts of about 1.6%, 2.1%, or 2.8% on the effectiveness of cast iron spheroidization
with magnesium was determined. The cast iron was melted and treated with FeSiMg7 master alloy under industrial conditions.
The metallographic examinations were performed for the separately cast rods of 20 mm diameter. They included the assessment of the
shape of graphite precipitates and of the matrix structure. The results allowed to state that the despheroidizing influence of aluminium
(introduced in the above mentioned quantities) is the stronger, the higher is the aluminium content in the alloy. The results of examinations
carried out by means of a computer image analyser enabled the quantitative assessment of the considered aluminium addition influence.
It was found that the despheroidizing influence of aluminium (up to about 2.8%) yields the crystallization of either the deformed nodular
graphite precipitates or vermicular graphite precipitates. None of the examined specimens, however, contained the flake graphite
precipitates. The results of examinations confirmed the already known opinion that aluminium widens the range of ferrite crystallization.
The problem considered in the paper is motivated by production planning in a foundry equipped with the furnace and casting line, which
provides a variety of castings in various grades of cast iron/steel for a large number of customers. The quantity of molten metal does not
exceed the capacity of the furnace, the load is a particular type of metal from which the products are made in the automatic casting lines.
The goal is to create the order of the melted metal loads to prevent delays in delivery of goods to customers. This problem is generally
considered as a lot-sizing and scheduling problem. The paper describes two computational intelligence algorithms for simultaneous
grouping and scheduling tasks and presents the results achieved by these algorithms for example test problems.
The investigations were inspired with the problem of cracking of steel castings during the production process. A single mechanism
of decohesion – the intergranular one – occurs in the case of hot cracking, while a variety of structural factors is decisive for hot cracking
initiation, depending on chemical composition of the cast steel. The low-carbon and low-alloyed steel castings crack due to the presence
of the type II sulphides, the cause of cracking of the high-carbon tool cast steels is the net of secondary cementite and/or ledeburite
precipitated along the boundaries of solidified grains. Also the brittle phosphor and carbide eutectics precipitated in the final stage
solidification are responsible for cracking of castings made of Hadfield steel. The examination of mechanical properties at 1050°C
revealed low or very low strength of high-carbon cast steels.
In this paper crystallization studies of low-alloyed construction cast steel were presented for different additions of chromium, nickel and
molybdenum modified with vanadium and titanium. Studies were conducted using developed TDA stand, which additionally enabled
evaluation of cooling rate influence on crystallization process of investigated alloys.
It has been found that the area where one can look for significant reserves in the procurement logistics is a rational management
of the stock of raw materials. Currently, the main purpose of projects which increase the efficiency of inventory management is to
rationalise all the activities in this area, taking into account and minimising at the same time the total inventory costs. The paper presents
a method for optimising the inventory level of raw materials under a foundry plant conditions using two different control models. The first
model is based on the estimate of an optimal level of the minimum emergency stock of raw materials, giving information about the need
for an order to be placed immediately and about the optimal size of consignments ordered after the minimum emergency level has
occurred. The second model is based on the estimate of a maximum inventory level of raw materials and an optimal order cycle.
Optimisation of the presented models has been based on the previously done selection and use of rational methods for forecasting the time
series of the delivery of a chosen auxiliary material (ceramic filters) to a casting plant, including forecasting a mean size of the delivered
batch of products and its standard deviation
Directional solidification of ledeburite was realised out using a Bridgman’s device. The growth rate for movement sample v=83.3 μm/s
was used. In one sample the solidification front was freezing. The value of temperature gradient in liquid at the solidification front was
determined. Interfacial distance λ on the samples was measured with NIS-Elements application for image analysis.
The work is a part of research into the reduction of energy consumption in the production of EPSthrough the modernization
of technological equipment used. This paper presents the results of research and analysis of heat transfer process between the water vapor
that was provided to machine, the mold, the product and the environment. The paper shows the calculation of the heat balance of the
production cycle for two types of mold: standard and modernized. The performance tests used an infrared imaging camera.
The results were used to develop a computer image analysis and statistical analysis. This paper presents the main stages of the production
process and the construction of technological equipment used, changing the mold surface temperature field during the production cycle
and the structure of the heat balance for the mold and its instrumentation. It has been shown that the modernization of construction
of technological equipment has reduced the temperature field and as a consequence of decreased of demand for process steam production
In paper is presented idea of construction and influence of selected parts of stand of horizontal continuous casting on quality of pure Al and AlSi2
alloy ingots. The main parts of the made stand belong to induction furnace, which is also tundish, water cooled continuous casting mould, system
of recooling, system of continuous ingot drawing and cutting. Mainly was considered influence of electromagnetic stirrer, which was placed
in continuous casting mould on refinement of ingots structure. Effect of structure refinement obtained by influence of electromagnetic stirring was
compared with refinement obtained by use of traditional inoculation, which consists in introducing of additives i.e. Ti and B to metal bath. The
results of studies show possibility of effective refinement of Al and AlSi2 alloy primary structure, only with use of horizontal electromagnetic field
and without necessity of application of inoculants. This method of inoculation is important, because inoculants decrease the degree of purity
and electrical conductivity of pure aluminum and moreover are reason of point cracks formation during rolling of ingots.
Investigations of operating parameters of widely used sand mixers reveal a wide variability range in the values of parameters associated
with their power demand. Power efficiency of manufacturing processes has received a great deal of attention lately, which encourages the
research efforts to optimise this aspects of operation of machines and installations as well. In the first place these machines
and installations have to work properly as a part of the process line- which applies also to moulding sand mixers. Experiments conducted
by the authors suggest that the same goal can be achieved at variable energy input levels. To obtain information about the power demands
of sand mixers requires the use of highly specialised equipment, methodology and result processing procedures. This study provides a brief
characteristic of measurement equipment and results of measurements taken on a unit AG-015 (based on a roller mixer) and a laboratory
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