In order to meet the requirements of the main drive of CNC lathe processing, CNC machine tools (attribute: automated machine tools) often use a motor stepless speed regulation system. The method of combining multi-level speed regulation realizes spindle speed regulation. In the numerical control processing, the control system issues instructions to make the tool perform various motions that meet the requirements, and the shape and size of the workpiece are expressed in the form of numbers and letters, and the processing required by the processing technology. It generally refers to the process of processing parts on CNC machine tools. In order to improve the degree of production automation, shorten the programming time and reduce the cost of CNC machining, a series of advanced CNC Swiss machining technologies have been developed and used in the aerospace industry.
1. Mechanical gear shift
In the main transmission system of CNC lathe processing, the traditional spindle box structure is greatly simplified due to the stepless speed regulation of the electric motor. However, due to the limitation of the spindle motor and the driving power supply, the output of constant torque is often in its low speed range. In order to enable the spindle to provide the maximum output power of the main motor within the entire speed range as much as possible, and to meet the needs of CNC machine tools (attributes: automated machine tools) for low-speed and powerful cutting, a combination of 1 to 4 gear speeds and stepless speed regulation is often used The method is the so-called stepless speed regulation in sections. The use of mechanical gearbox housing gear deceleration not only amplifies the output power, but also expands the range of speed regulation.
When CNC lathe processing is cutting, the spindle runs automotive parts at the speed specified by the S command in the part processing program. Therefore, there must be two types of spindle speed command signals in the numerical control system, that is, analog (definition: virtual of real things or processes) or digital signal S code to control the drive speed regulation circuit of the spindle motor, and at the same time use the switch signal (M code) to control the actuator of mechanical gear shifting and automatic shifting. The automatic shifting actuator is an electric-mechanical conversion device, commonly used hydraulic shift forks and electromagnetic clutches.
2. Motor speed regulation
The speed-regulating motors used for the spindle drive of CNC lathes are mainly divided into two categories: DC and AC.
(1) DC motor speed regulation-usually Axis CNC tools have a large speed regulation range, and the DC motor speed regulation adopts both voltage regulation and magnetic regulation. The characteristic curve of its typical DC spindle motor is shown in Figure 61. It can be seen from its characteristic curve that the motor below the speed n0 belongs to constant torque speed regulation, that is, it is realized by changing the armature voltage; above the speed n0, it belongs to the constant power (referring to the work done by the object in a unit of time). How much) Speed regulation is achieved by changing the excitation current.
The more commonly used FANUC DC-excited spindle motor uses a three-phase fully-controlled thyristor (zhá) tube non-circulating current reversible speed regulation system, which can realize voltage and magnetic speed regulation, and the speed range is 35. ?~3500r/min. CNC electronics machining General CNC machining usually refers to computer digital control precision machining, CNC machining lathe, CNC machining milling machine, CNC machining boring and milling machine, etc. The feed route of finishing is basically carried out along the part contour sequence. Therefore, the focus of determining the feed route is to determine the feed route of rough stainless steel machining and idle stroke.
(2) AC motor speed regulation
At present, cage induction motors are used in AC main shaft drives of CNC machine tools, and vector control frequency conversion speed regulation methods are widely used.
With the improvement of new DC and AC spindle speed control motors, motor speed control will be widely used. However, in order to reduce costs in economical CNC machine tool steel
(attributes: automated machine tools), mechanical gear shifting methods are often used. Change the spindle speed. In the numerical control processing, the control system issues instructions to make the tool perform various motions that meet the requirements, and the shape and size of the workpiece are expressed in the form of numbers and letters, and the processing required by the processing technology. It generally refers to the process of processing Iron parts on CNC machine tools. In order to improve the degree of production automation, shorten the programming time and reduce the cost of CNC steel machining, a series of advanced CNC machining technologies have been developed and used in the aerospace industry.
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CNC machine tool (attribute: automatic machine tool) processing is a high-precision, high-efficiency automatic machine tool. The use of CNC machine tool processing can improve processing efficiency, create more value, and get rid of the backward processing technology. The processing technology of ordinary lathes is similar. What are the advantages of CNC machining?
1. High productivity
CNC machine tools can effectively reduce the processing time and auxiliary time of the parts. The spindle speed and feed range of the CNC coffee machine parts tools are large, allowing the machine tools to carry out powerful cutting with large amounts of cutting, the rapid movement and positioning of the moving parts of the CNC machine tools and high-speed cutting processing. , It reduces the turnaround time between processes of semi-finished products and improves production efficiency.
2. High processing accuracy
The machining accuracy (precision) of CNC machine tools can generally reach 0.005～0.1mm. CNC machine tools are controlled in the form of digital signals. Each time the CNC device outputs a pulse signal, the moving parts of the machine tool move by one pulse equivalent (generally 0.001mm) , And the average error of the backlash of the machine tool's feed drive chain and the lead screw pitch can be compensated by the numerical control device. Therefore, the numerical control machine tool has a relatively high positioning accuracy. CNC machining CNC is also called computer gong, CNCCH or numerical control machine tool. It is actually a kind of name in Hong Kong, which greatly reduces the number of tooling. CNC machining parts with complex shapes does not require complex tooling. CNC machining is a new type of processing technology, the main work It is to compile the processing program, that is, to convert the original manual work to computer programming. If you want to change the shape and size of the part, you only need to modify the part processing program, which is suitable for new product development and modification.
3. Highly flexible
To ensure the surface accuracy (accuracy) of the workpiece, it mainly depends on the processing procedure. It is different from the ordinary machine tool. There is no need to manufacture and replace many tools and fixtures, and there is no need to adjust the machine tool frequently. CNC machining General CNC iot machining usually refers to computer digital control precision machining, CNC machining lathe, CNC machining milling machine, CNC machining boring and milling machine, etc. The feed route of finishing is basically carried out along the part contour sequence. Therefore, the focus of determining the feed route is to determine the feed route of rough machining and idle stroke. Therefore, Stainlesss teel parts tools are suitable for occasions where parts are frequently replaced. That is, it is suitable for single piece, small batch production and the development of new products, shortens the production preparation cycle, and saves a lot of process equipment costs.
4. The processing quality is stable and reliable
To process the same batch of parts, on the same machine tool, under the same processing conditions, using the same tool and processing procedure, the cutting path of the tool is exactly the same, the consistency of the masks machine parts is good, and the quality is stable (explanation: stable and stable; no change).
5. Conducive to modernization of production management
CNC machine tools (attributes: automated machine tools) can accurately estimate the other processing time in advance, and the tools and fixtures used can be standardized and modernized. Numerical control machine tools use digital signals and standard codes as control information, which is easy to realize the standardization of processing information. At present, it has been organically combined with computer-aided design and manufacturing (CAD/CAM), which is the basis of modern integrated manufacturing technology.
6. Improve working conditions
After the CNC machine tool (attribute: automatic machine tool) is adjusted before processing, enter the program and start it, and the machine tool can automatically and continuously process until the end of the processing. In the numerical control processing, the control system issues instructions to make the tool perform various motions that meet the requirements, and the shape and size of the workpiece are expressed in the form of numbers and letters, and the processing required by the processing technology. It generally refers to the process of machinery parts on CNC machine tools.
In order to improve the degree of production automation, shorten the programming time and reduce the cost of CNC machining, a series of advanced CNC machining technologies have been developed and used in the aerospace industry. Operators are mainly engaged in program input, editing, loading and unloading of masks-machine-parts, tool preparation, observation of aluminum machining status, and parts inspection. The labor intensity is greatly reduced, and the labor of machine tool operators tends to be intellectual work. In addition, the machine tool is generally closed processing, which is clean and safe.
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In the era we live in, the efficiency of many different machines instead of manual work to complete this kind of work will be greatly improved, so let's now take a look at what is the main purpose of cnc processing?
1. Cnc machining is responsible for the operation, cnc machining maintenance and daily maintenance of the machining center machine tool, and is familiar with the performance and basic structure of the machining Shop center group machine tool;
2. The cnc processing is subject to the production arrangement for product trial production and mass production, and the products are processed according to the requirements of the drawings to ensure product quality;
3. Cnc machining process can understand the drawings and related process technical documents, assist in the analysis, processing and resolution of quality problems, and propose improvement plans;
4. The cnc processing department actively cooperated with the quality inspection department, and notified its supervisor in time if the quantity was found to be inaccurate, and the FQA inspection department would proofread it;
5. The cnc processing and technical departments coordinate to deal with Technical application problems, actively provide relevant plans, and deal with on-site problems in a timely manner;
6. For cnc processing, fill in the documents and materials of the processing center machine tools and products as required, and make production operation records and cnc processing equipment maintenance records;
7. The cnc process Introduction completes other quality management system work and actively assists in the completion of the work of related departments; completes other tasks assigned by the superior.
Extended information:
Compared with ordinary machine tools, CNC machine tools have the following characteristics:
High processing precision and stable processing quality;
Multi-coordinate linkage can be carried out, and Autometal parts with complex shapes can be processed;
When Tailored machining parts are changed, generally only the NC program needs to be changed, which can save production preparation time;
The machine tool itself has high precision, large CNC sheet metal machining rigidity, can choose a favorable processing amount, and high productivity (generally 3~5 times of ordinary machine tools);
The machine tool has a high degree of automation, which can reduce labor intensity;
The requirements for the quality of the operators are higher, and the technical requirements for the maintenance personnel are higher.
working principle
CNC machine tools generally consist of the following Building parts:
The host, which is the main body of the CNC machine tool, includes the machine body, CNC machining column, CNC machining spindle, CNC machining feed mechanism and other mechanical components. It is a Medical parts used to complete various cutting processes.
The numerical control device is the core of the numerical control machine tool, including hardware (printed circuit board, cnc processing CRT display, cnc processing key box, cnc processing paper tape reader, etc.) and corresponding software for inputting Prototype parts programs and completing the input Information storage, cnc processing data conversion, cnc processing interpolation calculation and realization of various control functions.
The driving device, which is the driving part of the CNC machine tool actuator, includes a spindle drive unit, a cnc processing feed unit, a cnc processing spindle motor and a feed motor, etc. It realizes the spindle and feed drive through the electric or Electronic parts servo system under the control of the numerical co
ntrol device. When several feeds are linked, it can complete positioning, cnc processing straight line, cnc processing plane curve and space curve processing.
Auxiliary devices, some necessary supporting Mobile parts
of index-controlled machine tools to ensure the operation of CNC machine tools, such as cooling, CNC machining chip removal, CNC machining lubrication, CNC machining lighting, CNC machining monitoring, etc. It includes hydraulic and pneumatic devices, cnc machining chip removal device, cnc machining exchange table, cnc alloy machining CNC turntable and CNC indexing head, as well as cutting tools and monitoring and testing devices.
Programming and other ancillary equipment can be used to program aluminum parts, cnc processing and storage, etc. outside the machine.
use
Numerical control CNC Lathing are mainly used for large-scale machining of parts, and their processing methods include turning outer circle, boring, turning plane and so on. Programs can be written, suitable for mass production, and the production process has a high degree of automation.
Since the Massachusetts Institute of Technology developed the world’s first CNC machine tool in 1952, CNC machine tools have been widely used in the manufacturing industries, especially in automobiles, CNC processing, aerospace, CNC processing, and military industries. Both hardware and software have developed rapidly.
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Factors
affecting the price of beryllium copper
International
economic situation. The correlation between the commodity market and the
economic situation is obvious, especially as the world economy is becoming
increasingly globalized, and the commodity market and the economy are more
related. Therefore, the price of beryllium
copperis closely related to the economic situation.
The consumption
of beryllium copper is mainly concentrated in developed industrial countries.
The economic conditions of these countries such as the United States, Japan,
Western Europe and other countries have a greater impact on the price of
beryllium copper. Generally speaking, the economic situation is good, the
demand for beryllium copperincreases, and
the price rises, and vice versa decline.
The production status of the producing
country. Chile is rich in beryllium copper resources and the world's beryllium
copper exporter. Zambia and Zaire in central Africa are also important
beryllium copper producing countries. Almost all of the beryllium copper
produced by them is used for export. Their production status is important to
the international beryllium copper market. great influence. The governance
situation in these three countries has always been unstable, and labor disputes
have often occurred, which also has a direct impact on the price of beryllium copper.
Seasonal influence. The seasonal
fluctuations in the price of beryllium
copper are more obvious, with a trough in January and a high price in August. The
influence of industry policy.
Since copper
beryllium is mainly used in electrical, electronic, construction, machinery and
transportation industries, the country's industrial policies for these
industries have a more important impact on the price of beryllium copper.
The price of the substitute. In the
telecommunications industry, beryllium copper has always been an important raw
material. However, due to the promotion and application of optical fiber
technology, the position of beryllium copper has been challenged. At the same
time, aluminumand other metal materials have the same
properties as beryllium copper and are also used in most areas of use. Instead
of beryllium copper.
The impact of inventory. Inventory is one
of the important factors affecting the price of beryllium copper. Under
different market conditions, companies will take different measures to increase
or decrease inventory. In order to ensure the production of raw materials or
speed up the flow of funds, throughput reserves will also be used at different
periods to stabilize the beryllium copper market.
The influence of other policies and
regulations. Since the beryllium copper machiningmarket is an international market with a
large volume of international trade, it is necessary to increase the import and
export policies,
Changes in
factors such as the exchange rate system and the intensity of combating
smuggling will also have an impact on the price of beryllium copper.
According to the introduction of precision CNC machining manufacturers, the large-scale CNC machining parts are made of bar materials, and the process plan of rough machining and finishing is adopted. The specific process flow is as follows: blank → rough turning → rough milling → aging → fine turning → fine milling.
CNC lathe is a kind of high-precision and high-efficiency automatic machine tool. The use of CNC lathe can improve processing efficiency and create more value. The emergence of CNC lathe has made enterprises get rid of the backward processing technology. The processing technology of the lathe is similar, and the processing technology of the CNC machine tool has the characteristics that other machine tools cannot match.
Rough milling: According to the analysis of precision ODM processing manufacturers, a margin of 1.5mm is reserved on the side and bottom of the cavity, and the process hole is pre-drilled at the hole position of φ12mm. Aging: Removal of material and processing stress. Finish turning: Finish turning the end face, the outer circle and boring the process hole φ6mm. It is required to complete the clamping in one time to ensure the coaxiality and lay a good foundation for the subsequent processing. Precision milling: to ensure the final requirements of the parts, is the focus of this article.
①Rough milling cavity rough machining mainly removes large margins and lays a good foundation for subsequent finishing. Therefore, when machining the cavity, choose a low-cost common digital control CNC machining milling machine. This process requires that the inner contour is machined according to the shown part structure drawing, the arc corner is R5mm, and the remaining finishing allowance is uniform, which is 1.5mm. And this process also needs to pre-process the positioning holes required for finishing at the φ12mm hole position.
②The high-speed machining technology of precision milling cavity is a manufacturing technology that has been applied in recent years. In high-speed cutting processing, due to the small cutting force, the machining deformation of the parts can be reduced, which is more suitable for thin-walled parts, and the chips are removed in a short time, most of the laser cutting heat is taken away by the chips, and the workpiece is thermally deformed Small, it helps to ensure the accuracy of the size and shape of the parts; high-speed machining can obtain higher surface quality, and the machining cycle is greatly shortened. Therefore, in combination with the characteristics of this type of thin-walled disc parts, high-speed machining is selected when finishing the cavity.
③Introduced by the precision CNC aluminum machining manufacturer, the positioning hole is processed by the center hole φ6mm and φ12mm hole as the positioning hole for the finishing of the part, so it must be machined in place before finishing the cavity.
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In the design process of aluminum alloy die castings, many customers are uncertain about the thickness of aluminum alloy die castings, and they do not know how thin the thickness of aluminum alloy die castings can be.
1. The aluminum alloy die-cast product wall is also not suitable for too thin, large-scale and too thin walls are prone to defects such as under-casting and cold partition.
2. The choice of wall thickness for aluminum alloy die-casting products: under normal conditions, the wall thickness is not suitable to exceed 4.5mm, suitable for small and medium-sized castings: zinc alloy material 1-3mm, aluminum and magnesium alloy 1.5-4mm, alloy copper 2- 4mm.
3. The thickness of aluminum alloy die-casting products should be uniform, which is beneficial to the additional condensation of aluminum alloy liquid after "filling". It can prevent the disadvantages of forging ground stress, shrinkage porosity and cracks.
4. For the thick-walled pipe part of the aluminum die-casting product variety, ribs or cast inserts can be selected to enhance its physical properties and improve process performance.
Therefore, in the thick wall design of aluminum alloy die-casting parts, it is not suitable to choose the method of raising the thickness of the wall to increase the bearing capacity of aluminum die-casting products. When the thickness of the casting exceeds the necessary limit, its impact toughness will decrease accordingly. Excessive thickness of the silicone casting wall will easily cause shrinkage porosity and air vents, and will cause the initial setting of the aluminum alloy die-casting production process to cause long initial setting, large shrinkage, core pulling, difficult demolding and other unfavorable conditions.
We focus on aluminum alloy die-casting customization and have many experienced die-casting production teams. We can also provide you with reasonable and effective suggestions during the process of thick wall control of aluminum alloy die-casting parts!
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1. Parts with high precision requirements
The precision requirements of precision CNC machining parts mainly refer to the
precision requirements of size, shape, position and surface, and the surface
precision mainly refers to the surface roughness. Because the CNC lathe has
good rigidity, high precision in manufacturing and tool setting, and can easily
and accurately perform manual compensation and automatic compensation, it can
process shaft parts with high dimensional
accuracy. In some cases, it can achieve the effect of turning instead of
grinding. In addition, because the motion of the CNC lathe is realized by
high-precision interpolation and servo drive, it can process parts with high
shape accuracy requirements such as straightness, roundness, and cylindricity.
Because the CNC lathe can complete a lot of
processing content in one clamping, it can effectively improve the position
accuracy of the parts, and the processing quality is stable. The CNC lathe has
the function of cutting at constant linear speed, so it can not only cnc machine parts with small and uniform
surface roughness, but also suitable for turning parts with different surface
roughness requirements. Generally, the machining accuracy of CNC lathes can
reach 0.001mm, and the surface roughness Ra can reach 0.16μm (precision CNC
lathes can reach 0.02μm).
2. Parts with small surface roughness
values
The precision CNC machining numerical control lathe has a
constant linear speed cutting function, which can machine parts with small and
uniform surface roughness values. The problem is that the surface roughness
depends on the feed rate and cutting speed when the material, the finishing
allowance and the tool have been determined. The cutting speed changes,
resulting in inconsistent surface roughness after turning. Using the constant
line cutting function of the CNC lathe, you can choose the best line speed to
cut cones, spheres and end faces, so that the surface roughness values after
turning are small and consistent. .
3. Parts with complex surface contour
shapes
Because the precision titanium machining CNC lathe has linear
and circular interpolation functions (some CNC lathes also have some non-arc
curve interpolation functions), it can turn complex shapes composed of
arbitrary straight lines and various flat curves. Body parts, including list
curves that cannot be described by equations that are processed by fitting
calculations. As shown in Figure 4-1, the molding surface of the closed cavity
of the shell part cannot be machined on an ordinary lathe, but it can be easily
machined on a CNC lathe.
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Compared with conventional CNC titanium machining processes,
the outstanding advantages of turning-milling combined machining are mainly
manifested in the following aspects:
(1) CNC turning and milling compound
processing manufacturers introduced to shorten the product manufacturing
process chain and improve production efficiency. A variety of special tools can
be installed, new tool arrangement, reduce tool change time, improve processing
efficiency, turning-milling composite processing can complete all or most of
the machining procedures in one
clamping, thus greatly shortening the product manufacturing process chain. In
this way, on the one hand, the production assistance time caused by the change
of the installation card is reduced, and the manufacturing cycle and waiting
time of the tooling fixture are also reduced, which can significantly improve
the production efficiency.
(2) Reduce the number of clamping and
improve cnc brass
machining accuracy. The reduction in the number of card loading avoids the
accumulation of errors due to the conversion of positioning benchmarks. CNC
turning-milling composite processing manufacturers analyze, at the same time,
most of the current turning-milling composite processing equipment has the
function of online detection, which can realize the in-position detection and
precision control of key data in the manufacturing process, thereby improving
the processing accuracy of the product; high-strength integration The design of
the machine bed improves the gravity processing ability for difficult-to-cut
materials; the machine is equipped with an automatic feeding device, which can
realize automatic feeding and continuous, basically realizing the assembly line
operation of a single machine tool.
(3) Reduce floor space and reduce
production costs.
CNC delrin machining
composite processing manufacturers analyze that the compact and beautiful
appearance design improves the use of space, and makes maintenance and repair
more convenient, so that customers can get the greatest satisfaction; although
the single unit price of the turning-milling composite processing equipment is
relatively high, but due to the manufacturing process chain The shortening and
the reduction of the equipment required for the product, as well as the
reduction of the number of fixtures, workshop area and equipment maintenance
costs, can effectively reduce the overall fixed asset investment, production
operation and management costs.
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The
existence of forging defects may affect the processing quality or processing
quality of the subsequent processes, and some seriously affect the performance
and use of the forgings, and even greatly reduce the service life of the
finished parts and endanger safety. Therefore, in order to ensure or improve
the quality of cold forgings, in
addition to strengthening quality control in the process and taking
corresponding measures to prevent the occurrence of forging defects, necessary
quality inspections should also be carried out to prevent subsequent processes
(such as heat treatment, surface treatment, cold processing, etc.). ) And
forgings with defects that have adverse effects on performance will flow into
the subsequent process. After quality inspection, remedial measures can be
taken on the forgings made according to the nature of the defect and the degree
of influence to use, so that it meets the technical standards or requirements
for use. Therefore, in a sense, the quality inspection of forgings, on the one
hand, is to check the quality of the forgings that have been made, and on the
other hand, to point out the improvement direction for the forging process, so as to ensure that
the quality of forgings meets the requirements of forging technical standards
and meets the design Requirements on processing and use.
Forging
The
quality inspection of hot forgings
includes the inspection of appearance quality and internal quality. Appearance
quality inspection mainly refers to the inspection of the geometric size,
shape, surface condition and other items of the forging; the internal quality
inspection mainly refers to the inspection of various items such as the
chemical composition, macrostructure, microstructure and mechanical properties
of the forging. Specifically, the appearance quality inspection of forgings is
to check whether the shape and geometric dimensions of the forgings meet the
specifications of the drawings, whether the forgings have defects on the
surface, what kind of defects are they, and what are their morphological
characteristics. The inspection content of the surface condition is generally
to check whether the forging surface has surface cracks, folds, wrinkles, pits,
orange peel, blisters, scars, corrosion pits, bruises, foreign objects,
underfill, pits, lack of meat, Defects such as scratches. The internal quality
inspection is to check the internal quality of the forging itself. It is a
quality condition that cannot be found by the appearance quality inspection. It
includes the inspection of the internal defects of the forgings and the
inspection of the mechanical properties of the forgings. Parts or large metal forgings should also be subjected to
chemical composition analysis.
Forging
For
internal defects, we will use low-power inspection, fracture inspection, and
high-power inspection to inspect the forgings for the presence of internal
cracks, shrinkage holes, porosity, coarse crystals, white spots, dendrites, and
streamlines that do not conform to the shape, Defects such as streamline
turbulence, penetrating flow, coarse crystal ring, oxide film, delamination,
overheating, overburning organization, etc. For the mechanical properties, it
is mainly to check the normal temperature tensile strength, plasticity,
toughness, hardness, fatigue strength, high temperature instantaneous rupture
strength, high temperature permanent strength, permanent plasticity and high
temperature creep strength.
After the forgings are produced into rigging,
their stress conditions, importance, and working conditions are different
during use, and the materials and metallurgical
forging used are also different. Therefore, different departments will
classify forgings according to the above conditions and the requirements of the
department. , Different departments and different standards have different
classifications of forgings.
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For zinc alloy die castings to be
electroplated surface treatment, this link is very important. If the
electroplating is not done well, all the work in the early stage will be
wasted. Therefore, we must pay attention to the electroplating process of the
product. Then the quality of electroplating is affected by those factors.Carbide die casting summarizes
the following for you:
1. For the selection of raw materials for
zinc alloy die-casting parts, regular national standard materials must be
selected for product die-casting.
2.
The design of zinc alloy die-casting parts should be reasonable. The shape of
die-casting parts should consider the concealing ability of electroplating, and
try to reduce the impervious holes, so that it is not easy to carry the
solution in the washing. Cut sharp corners and other parts to make the power
lines evenly distributed during electroplating.
3.
The die casting and die-casting mold manufacturing
design are reasonable, so that the die-casting parts will not suffer from
the shortcomings of shrinkage, pinholes and looseness. The above-mentioned
shortcomings will directly affect the adhesion of the coating.
4.
In the production process of zinc alloy die castings, try to reduce the
segregation phenomenon. If aluminum segregates in certain parts, aluminum will
firstly dissolve during degreasing, which will cause pores and pinholes on the
surface of the die-casting parts and cannot be cleaned, resulting in poor
bonding strength, resulting in peeling and blistering of the coating.
5.
Pay attention to the scale during the grinding and polishing process. The fine
layer of 0.05-0.1mm formed during the cooling process of the Magnesium die casting
is very important for electroplating. The loss of the fine layer should be
reduced as much as possible during the grinding and polishing. If this layer is
ground and thrown away, What will be revealed will be a porous structure, and
no good electroplating layer will be obtained on this layer.
6.
The copper-nickel-chromium electroplating layer composed of multiple plating
types is a negative plating layer relative to the substrate. As long as the soft magnetic
mold core materia maintenance is effective, the zinc alloy parts will
corrode in the humid air, so it is necessary to ensure that the plating layer
is free hole. Otherwise, the corrosion products of the zinc alloy will cause
blistering of the coating. Compared with steel parts, the coating should be
thicker to be suitable for zinc alloy die castings.
7. Residues of die-casting parts in the
process of die-casting and die machining should
be cleaned as much as possible after processing. Because the residue is a vivid
metal, in any process of electroplating, it will react with the solution and
damage the plating solution, which will affect the quality of electroplating.
Zinc alloy die casting
The main factors affecting the
electroplating quality of zinc alloy die castings are summarized in the above
seven points. We focus on the customization of the die casting industry and
have our own surface treatment department. The quality is controllable and the
cost is controllable. Welcome to consult if you need it!
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