How to find a good die casting manufacturer in China

zinc die casting vs aluminum die casting

China has become a world manufacturer been 20 years, that every one wants to buy things from China, Once you have a project that need to make some die casting products, then you need China die casting manufacturer supplier. If you are looking for a good die casting manufacturer in China, there are a few steps you can take to ensure that you find a reputable and reliable company:

  1. Research the market: It is important to have a good understanding of the die casting industry in China before starting your search. This will allow you to identify potential manufacturers and evaluate their capabilities. You can do this by reading industry reports, attending trade shows, and speaking with industry experts.
  2. Define your needs: Clearly define your requirements for the die casting manufacturer, including the type of die casting process you need (such as aluminum die casting, zinc die casting, etc.), the size and complexity of the parts you need, and your budget. This will help you narrow down your options and find a manufacturer that can meet your needs.
  3. Get quotes from multiple manufacturers: Once you have a list of potential manufacturers, request quotes from each of them. This will allow you to compare prices and services offered by different manufacturers.
  4. Review the manufacturer’s capabilities: Check the manufacturer’s website and marketing materials to get an idea of their capabilities. Look for information about their equipment, experience, and capacity. You can also request samples of their work to get a sense of their quality.
  5. Visit the manufacturer: If possible, visit the manufacturer’s facility to get a firsthand look at their operations. This will allow you to see their equipment and facilities, meet their team, and get a sense of their culture and values.
  6. Check references: Ask the manufacturer for references from their previous customers and follow up with those references to get an idea of the manufacturer’s reliability and quality.

By following these steps, you can find a good die casting manufacturer in China that is able to meet your needs and deliver high-quality products.

Why your should buy die casting products from China supplier?

There are a few reasons why you might consider buying die casting parts from China:

  1. Cost: China is known for its competitive manufacturing costs, and die casting is no exception. By sourcing die casting parts from China, you may be able to save on material and labor costs, resulting in lower production costs overall.
  2. Quality: While there is a common perception that Chinese-made products are of lower quality, this is not always the case. Many Chinese die casting manufacturers have implemented advanced quality control processes and have achieved certifications such as ISO 9001.
  3. Experience: China has a long history of manufacturing and a well-developed supply chain. As a result, Chinese die casting manufacturers often have a wealth of experience and can offer a range of manufacturing capabilities.
  4. Wide range of suppliers: There are many die casting manufacturers in China, which means you have a wide range of options to choose from. This can make it easier to find a manufacturer that meets your specific needs and requirements.
  5. Strong export infrastructure: China has a strong export infrastructure, making it easier to ship products to other countries. This can be especially beneficial if you are located far from China and need to import the parts.

Overall, buying die casting parts from China can offer a number of benefits, including cost savings, quality products, and a wide range of supplier options. However, it is important to do your due diligence and carefully research potential suppliers to ensure that you find a reputable and reliable manufacturer.

 

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Die Casting parts Wall Thickness Should Be As Consistent

There are no hard and fast rules governing die casting parts wall thickness and consistency.  Inherent in the process is a wall section

that possesses a dense fine-grained skin, 0.015-0.020 in. thick (0.4-0.5 mm).  The material between the surface skins tends to be less dense and large grained as a result of a longer solidification time.  This is where defects tend to congregate.

Die casters have demonstrated the capability of casting 0.06-0.07 in. (1.5-1.8 mm) thick aluminum walls over large surface areas.  It is feasible to cast small areas as low as 0.04 in. (1 mm). Zinc alloys flow more readily, and can be cast to wall thickness as low as 0.03 in. (.75 mm) Magnesium alloys can be cast to wall thickness 0.035-0.045 in. (.89-1.14 mm)

Wall sections should be as uniform as possible.  It is difficult to achieve uniform and rapid solidification of the alloy if

the heat load varies from one location to another in the die.  Thinner walls contribute a lesser heat load than heavier walls and will have a longer die life.

die casting part wall

die casting part wall

Intersections of walls, ribs and gussets should blend with transitions and generous radii

Generous radii, outside corners, and transitions promote metal flow and internal integrity.  Radii and fillets also

enhance structural integrity by reducing stress concentrations in the casting.  Additionally, fillets reduce heat concentration in both the die and castings.  Hot spots that result from sharp corners promote shrinkage voids in the casting. These hot spots also reduce die life at sharp corners in the die cavity steel.

Standard draft should be specified

Draft is highly desirable on surfaces parallel to the direction of die draw because it facilitates ejection by allowing

the casting to release easily from the die surfaces.  The NADCA Product Standards recommendations for minimum draft should be specified.

Sharp corners should be eliminated or minimized

If sharp corners are required, they readily are accommodated at parting lines and at the junctions of die components.  Sharp corners should be broken with radii or chamfers.

Undercuts should be avoided

Undercuts should be avoided because they may require machining operations or additional die components, such

as retractable core slides.  Slides increase the cost of die fabrication and maintenance.  They can also add to cycle time and manufacturing problems if they flash.  If possible, the component should be redesigned to eliminate undercuts.

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Aluminum die casting and its importance in Aerospace Industry

Aluminum Aerospace parts

Aluminum die casting items are of remarkable use in different industry sectors and more so in the aerospace engineering where precision and top standard items is of greatest significance. These items are used in building both little as well as the big components in the aviation industry. Additional, die casting aluminum are used both in the pivotal military sector as well as commercial. The reason for this is easy – they are cost-friendly solutions and provide amazing outcomes.

Apart from being cost effect, the parts made from die casting aluminum are additionally prepared to endure extreme weather situations and increased damages. Another vital reason for using aluminum products in aircraft is that the meal is comparatively affordable than other metals that are die casted. Additional,  aluminum has the potential to get with other metals in order to provide durability and much flexible.

die casting parts

With aluminum casted products, you do not have to compromise on the standard yet can them at much affordable production cost. Further, all the standards that have been set for using of metal components, aluminum relax the need to the utmost. Hence, they are certified secure for use in planes, affordable and have all the qualities that are needed for flying crafts. So casting aluminum is on the boost like never before. Further, the top thing about an aluminum die cast part is that its weight is favorable for the aircraft works.

So, how actually is casting Aluminum done and what are the processes involved? Well, the reply is simple. Aluminum alloy is first forced into a top-grade steel at high speed and force in a high temperature. This outcomes in superior standard products that are very light and thin walled perfect for use as aircraft components.

It is to be mentioned here that Aluminum diet casting is a hard technique. Only a truly experienced and top standard team of engineers can make sure that the parts come with top volumes or with excellent tolerances and surface finish. Actually, this type of force casting is far more famous than gravity die casting or sand casting. This is because the need for machining is this type weather for Zinc or aluminum casting is extremely low due to the close casting tolerances. Though the tooling cost in casting Aluminum or rather any metal are considerably higher than the other 2 types yet, the mechanical properties achieved thus are far excellent in terms of functionality.

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What is die casting clamping force

Die Casting clamping force is the force applied to a mold by clamping unit of HPDC die casting machine. The clamping force must be grater their separating force.

Which applied by the injection of molten metal into the mold

The clamping fore > separating force

How to calculate the separating force (opening force)?

Opening force is the force acting on the cavity to make the die expand during the production of die casting part. The opening force can be calculated by the following formula:

F=PXA

F: opening force

P: specific injection pressure

A: Total projected area

What is Specific injection pressure?

Molten metal is ladled through the shot hole into the cold chamber and the shot plunger pushes the metal into the die. The pressure applied by plunger to push the metal into the die is specific injection pressure.

Injection pressure use for different type of casting:

  1. For standard casting =600 kg/cm2
  2. For technical casting =600−800 kg/cm2
  3. For pressure testing casting =800 kg/cm2

What is projected area?

The anticipated region is a two-dimensional zone estimation of a three-dimensional article by anticipating its shape on the plane.

Total projected area =casting projected area + slide projected area + runner projected area + overflow projected area

Example

  • Casting projected areas =56000mm2
  • Overflow + runner projected area =22400mm2 (40% of total casting projected area )
  • Slide projected area=projected area must be selected in the plane that is normal to be direction of core travel x tanꬾ

Angle of wedge = angle of finger cam angle + 2degree

Force FY = F X Tan ꬾ

ꬾ = angle of wedge lock

Example:

  • Slide core 1 projected area=area normal to direction of travel × tanꬾ

=5000× tan20 degree

=5000× 0.36

=1800 m2

  • Slide core 2 projected area=4500×tan 20degree= 1620mm2 so,

Total projected area= 56000+22400+1800+1620mm2

                                                                       =81820 mm2

What is separating force (Opening force)?

(For technical casting=600−800 kg/cm2)

(800 kg/cm2       =8kg/mm2)

Opening force = specific pressure ×total projected area

=8 kg/mm2 × 81820mm2

=654560 kg/mm2 (1 ton = 1000kg)

=654.56 T

Die clamping force

The clamping force must be grater then the separating force.

Locking force require =F×1.2

=654.56×1.2

=785.472 tons

We select the 900T machine

What is fill ratio, how it is important for selecting machine tonnage?

It is the percent of liquid metal vulnerable chamber contrasted with the absolute volume of the virus chamber. Another method for saying it would be the level of metal contrasted with the level of air exposed to the harsh elements chamber

For Example

50% full (of metal) = 50% air remaining

The level of fill is significant in light of the fact that it is utilized to ascertain the ideal moderate shot speed.

This can have a quality impact on the casting.

Fill ratio (30-40%) is good for automobile die casting component quality.

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The Die Casting Process Step By Step

Die Casting manufacture company

The climbing phase:

  • The 1st step is to prepare the die halves for casting by cleaning the faces of each die then applying lubrication or release agent.
  • Once the die has been prepared, the die halves are closed and clamped together with pressure applied from the die-cast machine.
  • The clamping force will depend upon the size of the machine but must be more than the opposing force trying to open the die during the casting process.Die Casting manufacture company

The injection phase:

  • The ingots are added to the furnace and kept molten at a set temperature according to the metal being used.
  • The molten metal is transferred to an injection chamber and injected into the closed die pressure ranging from 1000 to 20,000 psi.
  • The pressure is maintained while the metal solidifies.
  • The amount is injected into the die is known as the ‘shot’
  • The injection of metal into the die is very short, this ensures the metals do not start to solidify before the die is completely filled.

The cooling phase:

  • After the injection is complete, the molten metal needs to solidify before the die is opened.
  • The cooling time will depend upon the part geometry as well as the metal thermodynamic properties.
  • The wall thickness of the parts plays a big factor in the cooling time, the thicker the wall section the longer the cooling time required.

The ejection phase:

  • After the cooling time has elapsed, the two die halves can be opened.
  • An ejection mechanism then pushes the solidified casting out of the die.
  • The force of the ejection will be determined by the size of the part, bearing in mind, the part shrink during the cooling process and tends to stick to the die surface.
  • Once the part has been ejected, the die can be closed ready for the next injection cycle.

The trimming phase

  • During the cooling and solidification phase, the casting will solidify as a complete cast unit which includes the part, flash, and any runner system
  • This excess material must be trimmed off to leave just the main cast product.
  • Method of trimming includes trim tools, band saw are manually clipping.
  • Any trimmed metal is either scrapped or recycled if permitted.

Advantages of die casting:

  • Die casting is fast

Die casting can be produced in seconds each part and quantities of hundreds to thousands of metal parts each day.

  • Near net shape

Die casting are produced “near net shapes” no matter how complex the shape are how tight the tolerances are.

  • Lighter weights

Die casting are stronger because of the material surface skin not the thickness of materials so parts can weigh less with thinner casting wall thicknesses.

  • Die casting is versatile

Many more part shapes and sizes can be produced using the die casting manufacturing process.

  • Die casting are durable

Die castings parts are metal and have a long service life.

  • Die castings are inexpensive

Die castings are fast to produce and useless material. Die casting are typically less expensive than most other metal parts manufacturing processes.

 

 

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Favorable Manufacturing For Zinc Die Casting Processes

Zinc die casting

The process of die casting with pressure injection can be followed until mid-1800. The components used were tin and lead, but the use has disappeared with the introduction of zinc and Aluminium alloys. This process has evolved over the years, from low-pressure injection molds to casting molds at pressures of up to 4,500 psi. The process can create high-quality products with excellent end surfaces.

Die Casting is an economical and efficient process for making various shapes. Considered superior to other manufacturing techniques, it is durable and aesthetic and combines perfectly with other parts of the machine that are part thereof. Dying has many advantages. Among these, the main is its ability to produce complex forms with a higher tolerance level than other mass-production methods. Thousands of identical prints can be produced before you need to add new mold tools.

Zinc die casting

Zinc die casting

High Die-pressure is a manufacturing process where aluminum that has been melted is injected by a casting machine under extreme pressure on steel or molds to make the design and detail parts of the model you want to make. Casting in tons of universal tightening. This record reflects the amount of pressure given on the matrix. The engine size varies from 400 to 4000 tons.

There are many advantages to using the die casting process compared to others. Die casting produces parts with thinner walls, narrower size limits and processes can be accelerated. Labor costs and finishing are the lowest with the dice. This process facilitates to obtain intricate forms with narrower tolerances. Unlike the forgery process, you can insert the kernel into the product created by this process.

Forms that cannot be obtained from rods or tubes can be easily achieved with casting. The number of operational processes is smaller, which leads to the reduction of waste materials.

Die casting is used when you need a stable, dimensional and durable component. They withstand heat and maintain a good level of tolerance, an important condition for each part of a good machine. They are stronger and lighter than the part made by other printing methods. Its parts are not welded or screwed, which greatly increases its efficiency. Another advantage is the many workarounds that you can get with the launch. Surfaces can be smooth or textured, which facilitates the application and its use.

Hopefully, this information can help you and thank you for reading the article about Zinc Die casting.

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China Die Casting Service

Aluminium die casting

Capacity To Meet Your Aluminum, Magnesium, Zinc and Vacuum Die Casting Needs.

Aluminum Die Casting

Providing high-quality Aluminum die casting parts at competitive prices requires modem die casting equipment. To reduce the effects that extreme cooling temperatures have on dies CNM TECH is converting its die cooling system from water to oil. Oil maintains a warmer die temperature that contributes to a more uniform casting and extends die life, an important factor in part costs.

CNM TECH Die Casting company is adapting robotic controls to the operation of die casting machines. This permits a substantial increase in production rates, important in both controlling costs and meeting delivery requirements. It also allows us to use our people in ways which make better use of their skills and experience.

To lower production costs, CNM TECH Die Casting manufacturer has developed and patented, new, low volume, energy efficient aluminum melting furnaces. Since aluminum can be melted efficiently in small quantities, it allows the company to supply casting machines with different alloys of aluminum simultaneously. Casting machines don’t have to stand to wait for a large furnace to supply the proper alloy. Schedules aren’t built around what alloy is in the furnace.

Zinc Die Casting

For applications where high impact strength, low cost anZinc Die Castingd close dimensional limits are important design considerations, zinc die casting plays an important role. Zinc normally permits higher production rates than aluminum and parts can be designed with thinner cross-sections. The resulting parts are highly resistant to corrosion and receptive to a variety of beautiful finishes.

High rates of production and uniform quality are maintained by die casting machines with automatic extractors.

Vacuum Die Casting

Vacuum die casting is preferred by many casting buyers because it results in a less porous part. CNM TECH’s Vert-a-Cast machines, with a clamping force of 400 tons, are capable of producing castings automatically at a much faster pace than manually-operated horizontal machines.

Vacuum die casting, a CNM TECH capability for ten years, is often the only economical way to meet critical porosity specifications.

Maintenance, repair, changes and corrections on dies are accomplished promptly in CNM TECH’s fully-equipped tool and die shop.

Alloy materials are melted, fluxed and cleaned in the central furnace before being transferred to die casting equipment.

If you have any die casting requirement, you are welcome to send us your requirement for a quotation.

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Die Casting Process

die casting processCNM Die Casting has the ability to offer various castings including die casting, investment casting, permanent mould casting, and sand casting for a wide range of alloys, including all die-cast alloys, many permanent mold alloys, and many magnesium alloys.

Our manufacturing processes have been accepted by the world casting market as equal or superior to conventional die casting.

Benefits of the CNM Die Casting Process

Better dimensional control

Improved cross parting line tolerances

Reduction in gas porosity

Improved balance properties of finished rotating parts
Use of “cast-in-place” inserts
Improved mechanical properties due to effective alloy modification
Better wear properties due to smaller grain size microstructure
Improved flexibility regarding alloys and types of castings

Machining

CNM Die Casting’s Machining Section utilizes the work cell concept and high-speed flexible machining equipment to complete secondary operations to CNM’s castings so that a part or subassembly is ready to install when it leaves our facility.

CNM Die Casting has evolved and responded aggressively to customer demands for providing high-speed machining and assembly services without initial capital expenditures. By factoring a portion of the cost of the existing equipment into each part, the customer benefits from faster set-ups and minimal initial capital outlays.

CNM Die Casting operates 8 die cast machines, complete in-house die casting mold making and CNC machining in an over 20,000-square-foot facility in DONGGUAN, China.

Our integrated manufacturing capabilities, together with over 100 employees, allow us to be your One-Stop, complete service die caster, and be consistently price competitive, while also maintaining a high standard of quality.

 

Below are Comparison of die casting processes
Metals that can be castMin.and Max mass, kgTolerance
on dim.,%		Surface finish,µ mMin. section size, mmDraft degProduction rate,pcs/hrMin. cored hole,mmPorosity
Sand CastingAluminium
Steel
CI and others		0.03, 100
0.10, 200, 000
0.03, 50, 000		0.09
to
0.03		4
8
8		3
6
3.5		4
to
7		10
to
15		65
Permanent
Mould Casting		Cast iron
Al and Mg		0.01, 50
0.01, 10		0.01
min		25
3		2504.5 to 6
6		4
Die CastingAl
Mg
Zn		0.015, 35
0.015, 35
0.05, 80		0.0015
0.0015		1
1
1		0.8
1.2
0.5		2
2
2		75 to 150

300 to 350

2.5
2.5
0.8		2
Precision
Investment Casting		Steel
Aluminium		0.005, 25
0.002, 10		0.003, to
0.005		1
1		1
0.8		1 to
3		  N/A0.5 to
1.25		1
Shell
moulding		Steel
Cast iron
Aluminium		0.05, 120
0.03, 50
0.03, 15		0.01
to
0.003		6
6
2.5		3.5
3
1.5		2
to
3		30
to
80		3
to
6		1
Centrifugal castingAluminium
Steel
Cast iron		up to
400		0.002
0.004
0.004		0.6
to
3.5		0.6
to
1.2		330
to
50		 N/A1
to
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Die Casting Manufacture Company

Die Casting manufacture companyCNM Die Casting is your one-stop, complete service Die Caster for various die casting parts including aluminum die casting, investment casting, sand casting. We offer you a single source for engineered die castings, together with cutting-edge engineering resources, advanced production capabilities and complete secondary finishing.

CNM Die Casting supplies high-quality aluminum, zinc, brass and magnesium die castings. We operate our casting factory in DongGuan, China for various castings, machining, assembly and die building, with over 20,000 square feet of total floor space.

We are a leader in innovative quality control systems. Our quality manufacturing system includes a process failure detection system

at every casting press. Rigorous 100% inspection is as much a production operation as any other manufacturing step and is woven into the sequential standardized work to assure manufacturing quality in finishing and machining.

As one of the divisions of CNM Manufacturing Group, CNM Die Casting can be more responsive to its customers and, simultaneously, offer more competitive, “made in China” pricing on quality products.

 

CNM Die Casting’s tooling department builds dies with state-of-the-art equipment.

Along with our experienced engineering and tooling department, we design tooling and assist customers with casting design issues. Excellent control of design and tool building allows us to produce high quality tools and parts at lower cost, and more quickly than anyone else in the industry.

Our Engineering and Tooling Department offers:

Tool Engineers to ensure specifications and dimensional criteria are met to the customer’s requirements

Design Engineers with the latest CAD/CAM technologies to design both product and tooling for the customer’s specification.

Technical on-site product design assistance for die castings

Production tooling built with CNC machines by in-house full capability large tooling facility state-of-the-art

EDM machines rapidly burn cavities to near-finished condition with oscillating feed.

Prototyping in the same tooling intended for production

Production tools are built with premium grade materials

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About Metal Casting Services

Metal casting services involve the shaping of free-flowing liquid metals through the use of dies, molds, or patterns.  Castings are generally roughly finished due to the nature of their production.  In many cases, additional finishing is required to remove burrs and other artefacts of the casting process.  Metal castings services are used to design a wide range of components and finished products.  Everything from simple nails and fasteners to engine blocks can be fabricated using metal casting services.  Common metal casting processes include sand casting, die casting, permanent mold casting, investment casting, centrifugal casting, and lost foam casting.

Sand Casting

Sand casting is used to make large parts (typically iron, but also bronze, brass, aluminum). Molten metal is poured into a mold cavity formed out of sand (natural or synthetic). Sand castings generally have a rough surface, sometimes with surface impurities and surface variations.

zinc Die Casting

zinc Die Casting

Die-casting includes a number of processes in which reusable dies or molds are used to produce casting.  The die contains an impression of the finished product together with it’s running, feeding and venting systems.  The die is capable of a regular cycle and of (quickly) dissipating the heat of the metal poured into it.  Once the liquid metal has cooled sufficiently, the mold is opened and the casting can be removed and finished.

Permanent Mold Casting

In permanent mold casting, molten metal is poured into cast iron molds, coated with a ceramic mold wash. Cores can be a metal, sand, sand shell, or other materials. When completed, the molds are opened and the castings are ejected.

 

Investment casting services involve molding patterns by the injection of a special wax into a metal die.  The patterns are assembled into a cluster around a wax runner system. The ‘tree’ of patterns is then coated with 8-10 layers of refractory material. The assembly is heated to remove the wax.  The hot mold is cast, and when cool, the mold material is removed by impact, vibration, grit blasting, high-pressure water blasting or chemical dissolution leaving the castings, which are then removed from the runner system.

Centrifugal casting

Centrifugal casting services are used to produce castings that are cylindrical in shape.  In centrifugal casting, a permanent mold is rotated about its axis at high speeds as the molten metal is poured. The molten metal is centrifugally thrown towards the inside mold wall, where it solidifies. The casting is usually a fine grain casting with a very fine-grained outer diameter, which is resistant to atmospheric corrosion, a typical need with pipes. The inside diameter has more impurities and inclusions, which can be machined away.

magnesium die casting

magnesium die casting

Lost foam casting

Lost foam casting (LFC) is metal casting services that use foam filled patterns to produce castings.  Foam is injected into a pattern, filling all areas, leaving no cavities.  When molten metal is injected into the pattern, the foam is burned off allowing the casting to take shape.

Die casting

Die casting and metal casting includes a number of processes in which reusable dies or molds are used to produce casting. The die is capable of a regular cycle and of (quickly) dissipating the heat of the metal poured into it. Once the liquid metal has cooled sufficiently, the mold or is opened and the casting can be removed and finished.

 

In the die casting process, molten metal is injected under pressure into a reusable mold or die. The die contains an impression of the casting together with it’s running, feeding and venting systems. The die is capable of a regular cycle and of (quickly) dissipating the heat of the metal poured into them. Once the liquid metal has cooled sufficiently, the mold or is opened and the metal casting can be removed and finished.

high pressure die casting

The high pressure die casting process is the most widely used, representing about 50% of all light alloy casting production. Low pressure die casting currently accounts for about 20% of production and its use is increasing. Gravity die casting accounts for the rest, with the exception of a small but growing contribution from the recently introduced vacuum die casting and squeeze casting process. the design of low pressure and gravity die casting dies for improved die filling, optimized solidification pattern and maximum yield. Gravity die-casting is suitable for mass production and for fully mechanized casting. Low-pressure die casting is especially suited to

Aluminum die casting

Aluminum Die Casting

the production of components that are symmetric about an axis of rotation. Light automotive wheels are normally manufactured by this technique.

Die casting metals can vary widely, and different die casting companies may have the ability to work with anyone or number of them. Some of the most common metal casting types include aluminum die casting, brass die casting, lead die casting (the most popular for model die casting), magnesium die casting, and zinc die casting.

Hope all of that information is enough for your reference, but if you want to know more information, you are welcome to contact us by phone or email.

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