introduction to the methods of improving the performance of Mould?
introduction to the methods of improving the performance of Mould.
matrix is required to have high enough strength and toughness to fit the mold
during work,and surface property play a important role in work performance
and service life of mould.surface
properties includes abrasion resistance、corrosion
resistance、fatigue property and friction coefficient.To
improve this property,it is super limited and uneconomical to rely on the
improvement of matrix materials solely,but we can get twice the result with
half the effort by surface treatment technology,so this is why surface
treatment technology is developing rapidly.
surface treatment technology of mould is a system engineering for obtain the
required surface properties by surface coating, surface modification or
composite treatment to change the shape, chemical composition, structure and
stress state of mould surface.
PVD is the mature deposition technology of hardening film at present.In order
to increase the bonding strength of the work piece surface, a variety of
enhanced CVD PVD techniques have been developed.Hardened film deposition
technology was initially applied to props(knives, cutting tools, measuring
tools) with excellent effect,a variety of tools has been coated hardened film
as standard process.The technology of coating hardening film has been used in
mould since 1980s.Under the present technical conditions, the cost of hardening
film deposition (mainly equipment) is high,because this technology is only used
in some precision and long-life mould,if we want to reduce the cost of coating
hardening film,the measure of heat treatment center should be established.If
more molds adopt this technology, we can improve the level of mould
manufacturing in our country as a whole more fast.
Selection of cutting fluid in
metal cutting process?
1.Rough turning machining
machining allowance of rough turning is large , so the cutting depth and feed
rate are large , cutting resistance is large , and produce a lot of cutting
heat , tool wear is also serious.The water based cutting fluid, which is mainly
used for cooling, lubrication and rust prevention, should be chosen to remove
the cutting heat in time, reduce the cutting temperature, and improve the tool
life. Generally, the extreme pressure emulsion is better.
The extreme pressure emulsion
not only has good cooling performance , but also has good extreme pressure
lubricity, it can obviously prolong the service life of cutting tools, improve
the cutting efficiency . Maintenance of guide rail surface of machine tool
should be paid attention to using water-based cutting fluid. Drying the cutting
fluid on the workbench before work and apply it with lubricating oil.
The machining allowance of finish
turning is small , cutting depth only have 0.05～0.8mm，feed rate is
small ,and ensure the precision and roughness of workpiece . As the cutting
force of finish turning is small , the temperature is lower. So it is
appropriate to use emulsion with high concentration of (above 10%) and cutting
fluid with oil additive. For high precision requirement turning , such as the
finish turning screw thread , It is need to use rapeseed oil, soybean oil or
other products as lubricant to meet the requirements of precision.
As mentioned above, because of the poor
stability of vegetable oil，easy
factories use 15%JQ－1precision
cutting lubricant +85%LAN32 full-loss system oil as the precision cutting oil,
the effect is very good.
Boring mechanism is the same as
turning,but it's internal hole processing，cutting
and cutting speed are small,but the heat dissipation conditions are poor, the
emulsion can be used as cutting fluid, and the flow and pressure of cutting
fluid should be increased.
Common faults of Servo system in CNC Machining Center?
1、Large current leads to machine tool alarm. Generally, there are
two kinds of possibility, that is, the damage of power drive element in NC
speed control unit of machining center and the high current alarm caused by
2、High voltage also leads to machine tool alarm. There are
generally three possibilities for high voltage alarm. It may be that the NC input
voltage of the machining center exceeds the rated value of 10%, or the
insulation performance of the servo motor decreases. or the high voltage caused
by machining center speed control unit line.
3、If the voltage is too low, the machine tool will be alerted, and
the probability of this happen in the machining center are very few, which may
be caused by the input voltage being less than 85% of the rated value, or poor
connection of power supply
4、The failure of the feedback line of the detection speed leads to
the alarm, which is a false alarm，because the airport has no
problems, but there is a problem with the detection feedback system. This kind
of alarm is mostly caused by the breaking of the speed feedback line of NC
servo motor in machining center or poor connection of the detection feedback
5、The protection switch is a device for protecting the machine
tool. For example, a large voltage will ruin some components or some emergency
measure for control. The protection switch will be activated when the situation
arises.This behavior is similar to a safety stop to avoid unnecessary component
6、The cause of overload alarm is the abnormal load of NC machine
in machining center, or the low limit value of motor current on the speed
control unit. The permanent magnet falling off on permanent magnet motor will
also cause overload alarm. If the NC motor without brakes in the machining
center is hard to turn by hand or shaft when no load, that is to say, permanent
magnetic full shedding.
7、The fuse on the CNC speed control unit is burned or Circuit
The performance characteristics of al-si,
al-mg and al-zn are commonly used？
Die casting alloy is one of the elements of
die casting production. For producing excellent die casting parts, in
addition to have reasonable perfect die mold structure and die-casting
machine with superior performance and perfect design, and also need to have
good performance of alloy material. The section thickness of die
casting parts is determined by the stress and the strength of the
alloy material itself, which is one of the advantages of die casting alloy.
When choosing die casting alloy, what we need to consider are its usability,
processing performance, application, production condition and economy.
1. Al - Si alloy
Due to Al - Si alloy has a small
crystallization temperature interval and a large latent heat of
solidification of silicon in the alloy, also it has a large heat capacity
and a small line contraction coefficient, that we say its general
casting perfermance chareacteristics are better than other aluminium alloy
casting performance, also has a better capacity of filling and
cracking, shrinkage tendency. Al-si alloy is the most widely used die casting
aluminum alloy so far.
2. Al - Mg alloy
The performance characteristics of al-mg
alloy are: good mechanical properties at room temperature; Strong resistance to
corrosion; but the casting performance is poor, the mechanical property
fluctuation and wall thickness has a big effect. The plasticity of the
alloy decreases due to the aging effect due to the long term usage, and
even the die-casting parts are cracked.
3. Al - zinc alloy
The high mechanical properties can be
gotten when the al-zn alloy die casting were obtained by natural aging. When
the mass fraction of zinc is greater than 10%, the strength can
be significantly increased.
The advantages and disadvantages of Electroplating?
The electroplating is to use the product dipped into the electrolyte, conduct electricity, and form a thin layer of electroplating on the surface of the product by electrolysis (generally 5~10μm).
Advantages:1. The surface flatness of the coating is extremely high, which can form a mirror surface2. Different coatings can be used to change the performance of the product, such as enhancing the conductivity and the hardness.3. Strong adhesion, it is almost impossible to fall off in daily use.4. High levelDisadvantages:1. It is almost none have the concealer ability, which has extremely high requirement on the surface of the workblank .2. High quality materials, such as zinc alloy, steel, plastic, etc. (aluminum and aluminum alloy plating performance is poor).3. The abrasion resistance is poor, the general metal coating abrasion resistance is poor, but there also have the exceptions (titanium plating , chrome plating and other metals can obviously enhance abrasion resistance).4. The corrosion resistance is generally poor, the general electroplating layer can be tested for 24~48 hours by salt spray, and the powder can be tested by salt spray over 1000 hours.5. Pollution, not environmental protection. So there are few local electroplating factories in foshan.6. High cost Welcome to contact us via http://www.yitaicasting.com/ or email@example.com
The advantages and disadvantages of sandblasting？
Advantages:1. Environmental protection, because the coating don’t need to be painted, the sand can be recycled, and it has little harm to the environment.2. Low cost3. The ability of concealer is very strong, which can completely eliminate the trace of surface water on the product.4. After sandblasting, it could be done the other surfaced finished to increase the adhesion of spray paint and spray powder.Disadvantages:1. Colorless selection, only the workblank itself color ..2. High noisy and dusty during the production.3. Flammable and explosive, it could be generated a large amount of metal powder during the production process, which can easily ignite or even explode.
Sandblasting is the use of sand to carry out high speed and high density of the product, which is formed the high density and small potholes in the surface on the product , so forming a frosted surface. Sandblasting is widely used in various hardware products, especially casting parts.