How much do you know about the principle of production mechanism of spheroidizing agent?
Today we continue to say,
which points can be used as the production mechanism
of spheroidizing agent principles?
(2) original liquid iron temperature and sulfur content
High temperature low sulfur iron liquid,
low magnesium low rare earth spheroidizing agent.
If the liquid iron of electric furnace is 1460 ~ 1520℃
and w(s) is 0.02% ~ 0.04%, FeSiMg8RE3
and FeSiMg7RE2 can be used.
If w(s)≤ 0.02%, FeSiMg6RE2 is used.
(3) Requirements for production process and casting
Low rare earth spheroidizing agent
is used for cast ferritic nodular cast iron,
yttrium base heavy rare earth...
Foundries are the source of industry, so what is the source of the source?
Foundries belong to the basic industry of industry.
If there is no foundries,
the mechanical industry can not run out.
From this point of view,
casting is the source of industry.
When it comes to the source,
it is more important to say the source of the source
- spheroidizing agent, inoculation agent
Nodular cast iron is now produced in almost all iron mills,
and as an indispensable spheroidizing agent for the production of
nodular cast iron has attracted more and more attention.
The choice of what kind of spheroidizing agent,
or what kind of spheroidizing agent is the best,
has...
How do casting engineers do daily quality management? (two)
How to do a casting engineer's daily quality management work,
and the last point
3, casting engineers should have
a rapid response mechanism and responsibility.
Take responsibility, face challenges, and be able to call a halt.
If there is a problem,
the production should be stopped immediately,
to avoid causing batch scrap.
What should be done in the quality management of
the production site is S (standard) D (implementation)
C (inspection) A (action) cycle to maintain the production quality;
Foundry engineers should consider the P (planning)
D (execution) C...
How do casting engineers do daily quality management? (a)
As a foundry worker,
if you want to be skilled in daily quality management work,
you must do the following:
1, to timely grasp the quality of frequently repeated
problem products in daily production.
In fact, the number of products that frequently go wrong
in daily production may only account for 10%
of the total number of products produced,
but it accounts for 80% of the overall impact.
For example, when we make incubating blocks,
we should pay attention to the furnace temperature,
mold arrangement,
and even the...
Do you distinguish between heat clearing crack and shrinkage crack?
Hello, today we're going to talk about hot cracking.
Hot cracking of steel castings usually occurs in the casting state.
Usually more heat shrinkage crack compact,
generally only after heat treatment or MT detection will show.
The crack is serrated,
but there is no epitaxial bifurcation of heat shrinkage crack.
If the crack has an opening,
it is dark and will oxidize obviously
because it is exposed to high temperature oxidation.
There are coarse grain boundary cracks, but only a little dendritic crystal.
Cracks usually occur along...
Learn about shape and weight error defects
Hello everyone, I am the youngest girl in the factory.
Today, let's talk about common casting defects -
shape and weight error defects.
Like the size of the shape, the weight of the weight,
the deformation, the wrong box, and the core,
these are all shape and weight error defects.
Prevention measures for shape and weight errors
are mainly the following:
(1) Strengthen the inspection and repair of the mold,
and maintain the stored molds regularly;
(2) Before production, check the positioning
and sales of the sandbox and mold (type plate).
(3) In...
Do you really know about casting defects?
Today we will talk about common casting defects -incomplete defects.
During the casting, insufficient pouring, leakage boxes,
less meat, and damage, these are all disadvantaged defects.
Prevention measures for the defects of incomplete categories are the following:
(1) Improve the watering temperature, speed up the pouring speed,
and prevent disconnection;
(2) Properly increase the cross -sectional area of
horizontal watering and internal watering;
(3) For the relatively small casting shapes,
the pouring speed is appropriately slowed to
ensure...
Causes and preventive measures of common casting defects: Surface defects
Today we will talk about common casting defects -surface defects.
There are main types of preventive measures for surface defects:
(one) Strictly control the performance of sand and core sand,
and improve the fire of sand and core sand;
(two) reduce the gap between sand particles;
(three) The thickness of the layer is peaceful and peaceful;
(four) the smoothness of the mold should be high,
and reasonably make the slope of the molding and cast the rounded corner.
(five)The damaged casting should be repaired before the box;
Sand, and...
The cause and prevention of common casting defects -- crack cold separation defects
Let's talk about common casting defects -crack cold partition defects.
There are cracks that penetrate or do not penetrate on the castings,
the appearance is twisted and irregular,
and the metal epidermis is oxidized at the crack,
which is the heat crack.
There are cracks that penetrate or do not penetrate on the castings.
The appearance is continuous or smooth curve.
The metal epidermis of the crack is not oxidized,
which is cold cracks.
The surface of the casting has an unprecedented gap or pilot,
and the edge of the interchange is...
Processing method of foundry silica sand #science
In this episode of dysprosium Peak class,
we're going to talk about silicon sand for casting.
Foundry silica sand and natural special sand,
artificial special sand, is a kind of foundry sand.
Foundry silica sand processing methods are mainly the following four:
(one) Washing method
After water washing, the sand is dehydrated and dried,
and the mud content is less than 1%,
which can meet the requirements of general casting process.
(two) Scrub or rub
That is, on the basis of washing,
coupled with strong mechanical scrubbing or rubbing.
(three)...
The characteristics and problems of molding materials
The so-called modeling material refers to the material used in
sand casting production through modeling,
core making and box fitting casting links.
Molding material plays an important role in casting production,
and its quality directly affects the quality,
production efficiency and cost of casting.
According to statistics, casting scrap due to the quality
or improper use of molding materials in casting production accounts
for more than 50% of the total rejection rate, casting cleaning,
finishing process costs of about 70%...
One minute Learn the advantages and disadvantages of organic and inorganic binders
Many people can't tell organic and inorganic binders apart.
Today's dysprosium class is about the advantages and disadvantages of the two.
Organic binder basically refers to resin,
with high bond strength of mold (core) sand,
high production efficiency,
good surface quality and high dimensional accuracy of casting,
excellent falling sand performance,
high recycling rate of old sand,
these five advantages;
The disadvantages are that the raw materials
are derived from petroleum products or agricultural chemicals,
and the...
The basic process of sand casting and sand type (core)
Today, let's talk about the basic process of sand casting.
Remember to pay attention to, like and collect
(one) sand mold (core) manufacturing
(two) sand mold (core) drying, box and pouring
(three) Casting falling sand, cleaning and post-treatment
(four) Casting quality inspection and defect repair
Among them, the mold used in sand casting is
generally composed of sand and core.
Sand mold: that is, the cavity made of molding sand
that forms the appearance contour of the casting is called casting mold;
Sand core: The entity made of core sand
that forms the...
Do you know how to improve the heat shrinkage cracking of castings?
Today, we will talk about how to improve the
phenomenon of heat shrinkage
and cracking of castings.
one. Before trying to solve the heat shrinkage crack,
find out its cause,
check the vertical direction of the crack,
determine whether there is any stress that may cause the secondary defect,
confirm the cause of the stress,
find out the hot spot and reduce the stress.
two, reduce shrinkage resistance: reduce the amount of
low collapse of sand mold fire mud core binder.
As far as possible to hollow mud core to improve...
Do you know the process variables of heat shrinkage cracking? （2）
In this episode, we will continue to talk about
the process variables of heat shrinkage cracking.
Three: pouring temperature
Single die inlet and high casting temperature will
increase the temperature gradient and produce high stress,
leading to heat shrinkage crack.
Four: pouring rate
High pouring rate can reduce the heat shrinkage crack tendency.
Five: modeling and clay core materials:
The shape and core material are important
variables affecting the resistance to solid shrinkage.
This shrinkage barrier will increase the thermal shrinkage crack...
Do you know the process variables of heat shrinkage cracking? (1)
In this episode,
we will talk about the process variables of heat shrinkage cracking.
I. Chemical composition:
Sulfur: Sulfur content increases thermal cracking,
which is the main variable.
Phosphorus: Increasing phosphorus content also increases thermal cracking,
but the effect is less than that of sulfur,
but this is also the main variable.
Manganese: if manganese sulfur is too high,
manganese has little effect on thermal shrinkage cracking.
Nickel: within 3%, no impact
Two: deoxygenation operation:
a. Type I globular sulfide is formed
when...
Do you really know anything about heat shrinkage cracking?
Today, we are going to talk about what is heat shrinkage cracking.
The thermal shrinkage crack is a jagged intergranular crack
on the surface of the casting with different sizes.
There are decarbonized and oxidized surfaces;
Usually occurs in hot spots. Several dendrite structures were
found on the fracture plane,
showing intergranular morphology.
In ASTM specifications, defects are usually classified as linear;
These thermal shrinkage cracks may be small enough to be
detected by magnetic particle inspection;
May be very long or...
The causes of cavity defects and its preventive measures
Today we continue to talk about the common casting defects - hole defects.
Porosity, shrinkage cavity, shrinkage porosity,
slag hole, sand hole are all porosity defects.
A smooth hole of unequal size on the surface,
inside or near the surface of a casting.
The shapes are round, long and irregular.
There are single beings and there are multiple aggregates.
Shrinkage cavity often exists at the junction of
large section and wall thickness of castings.
Irregular shape, pore wall rough, coarse grain.
Shrinkage porosity is a small incoherent shrinkage...
The causes and preventive measures of defect of polymeat
I am the youngest girl in the factory.
Today we are going to talk about a common casting defect - multi meat defect.
Flying wings, burrs, lifting boxes, bulging boxes,
meat, these are "meat defects"
The main prevention measures for meat defects are as follows:
(one) Reasonable layout, prevent blowing sand is not solid,
prevent lifting box and mold
(two) Adjust the sand mixing process, control the moisture,
improve the strength of molding sand;
(three) reasonable sand granularity and refractoriness to prevent veins;
(four) Reasonable tooling design to ensure...
Eight casting defects
Today I want to talk to you about casting defects.
Casting defect is an important reason leading to low performance,
short service life, scrap and failure of castings.
Therefore, the morphology, characteristics,
causes and forming process of casting defects
are analyzed in order to prevent,
reduce and eliminate casting defects.
Eliminating or reducing casting defects is
an important part of casting quality control.
According to GB/T 5611-1988 "Casting Terminology",
casting will be performed
Defects are divided into eight...
Factors affecting the spheroidization Effect of Nodular cast iron Produced by Electric Furnace (V)
I am the youngest girl in the factory.
What factors affect the effect of graphite spheroidization
in the production of ductile iron?
What I want to do in this video is summarize the rest of the factors
eleven. Influence on the quality of the original molten iron:
The molten iron in the furnace should be checked for
its maturity before spheroidization.
The white port value of the original molten iron is too large,
easy to appear white metallography.
12. Cooling speed influence: increasing the cooling speed of
molten iron will get more balls...
