What Is Die Casting?Die Casting and it is a precision casting method that obtains the same casting as the mold by injecting molten metal into a steel mold that is precisely machined to perfectly match the required casting shape. In addition to the advantages of almost no need for finishing as the dimensions are accurate, it has excellent mechanical properties and is capable of mass production.Die casting is also called pressure die casting. It is a precision casting method in which molten metal is injected into a steel mold that is precisely machined to perfectly match the required casting shape to obtain a casting identical to that of the mold. The product is called die-casting parts.

In addition to the advantage that there is little need for finishing because the dimensions are accurate, it has excellent mechanical properties and can be mass-produced. The metal used is an alloy such as zinc, aluminum, tin, copper, and magnesium, and it is cooled and solidified by injecting it by air pressure, water pressure, or hydraulic pressure using a die-casting machine.

There are many automobile parts as products, including parts for electrical equipment, optical equipment, vehicles, weaving equipment, construction equipment, and measuring instruments.

The Definition And Terminology Of Die Casting

Die casting is defined as “a casting method that mass-produces castings with excellent casting surfaces with high precision by pouring molten metal into a precision mold and products resulting from it”. In Japanese, the word “die casting” is also used, but American die casting is adopted. In the UK, mold casting is called gravity die casting, low pressure casting is called low pressure die casting, and die casting is called pressure die casting.

The Characteristics Of Die Casting

The main advantages and disadvantages of die casting are as follows.

“Advantages”

• Products with complex shapes can be mass-produced in one process.
• Because it is high-speed and high-pressure filling, there is no molten metal vortex and the dimensional accuracy of the casting state is good.
• Because it is a high-speed and high-pressure filling, the hot water flow is good, a thin product can be made, and the casting surface is beautiful.
• The productivity per hour is good because it is fast charging and rapid cooling and solidification.
• Mechanical properties are improved by the formation of a seven-layer by rapid cooling.

“Disadvantage”

• Coping with pores caused by the inflow of air or gas.
• Solution treatment or welding cannot be performed due to the inflow of air or gas.
• Since the mold is expensive, economical mass production cannot be secured.

Die Casting Machine

Because the sleeve and flanger are not in the molten metal and are not heated, it is called a gold chamber.On the other hand, a machine called a hot chamber is used for die casting of zinc or magnesium and is not used for aluminum alloy. Cold chamber die casting machines in Japan have a minimum clamping force of 0.5MN and a maximum of 40MN. The injection force is 1/10 to 10/20 of the clamp force.

Die Casting Cycle

One cycle of aluminum alloy die casting by cold chamber machine will be described.

• a) Close the two molds by matching the movable mold to the fixed mold by the machine’s mold clamping operation. With a ladle, molten aluminum alloy is poured into a sleeve called a cold chamber.
• b) The plunger operates and presses the molten metal into the mold cavity at high speed and high pressure. The mold is water cooled to prevent overheating.
• c) When the molten metal solidifies, open the mold and return the flanger and the moving core to their original state.
• d) Operate the extrusion pin to push the product out of the die casting molds.

The size of the machine used depends on the size of the die-casting product. One cycle of die casting takes several seconds for small size and several minutes for large size. In recent die casting production, some factories are aiming to automate their operations and unmanned them.

Casting pressure, which is a typical casting condition item of aluminum die casting, is in the range of 10 to 200 MPa, and the gate speed is in the range of 2 to 100 m/s. The casting conditions of die casting are quite different from those of gravity casting.

Features are as follows

• Cast with high pressure
• Cast at high speed. Therefore, the filling time into the mold is very short
• In the mold, the filled molten metal is rapidly cooled and solidified.

Die Casting Manufacturing Process

Die casting work performed in most factories is supported by automatic hot water supply device, plunger lubrication device, automatic spraying device, product dispensing device, etc., and is being mechanized and systemized. Fully automatic operation and unmanned operation are also being realized. The trimming device mainly relies on the knitting press operation, but sand blasting or shot blasting are also used in combination. In post-processing, machining and surface treatment are performed. For the surface treatment, buffing, chemical conversion, painting, anodizing, plating, and the like can be selected.

Dimensional Tolerance Of Die Casting

It goes without saying that the dimensional accuracy required for a product is after final processing, and errors in material and processing are added.

The dimensional tolerance of the typical aluminum alloy die-casting ADC12 in the as-cast state can be interpreted as follows.

• Dimensional tolerance = casting tolerance + mold tolerance + shrinkage vs. calculation tolerance + tolerance for casting operation
• Calculation formula for maximum possible dimensional tolerance – ε=±0.75×10-³×L。(mm)
• Calculation formula for precise dimension tolerance – ε=±(1.15×10-³×L。+0.1) (mm)
• Calculation formula for general dimensional tolerance – ε=±(2.15×10-³×L。+0.2) (mm)

In this case, L. is the length of the mold cavity at room temperature, and ε is the dimensional difference of the die casting. The factor that fluctuates the casting tolerance is the mold temperature difference.As a standard for dimensional tolerance, there is JIS B 0409 die casting normal tolerance, and the normal tolerance of length and the maximum value of degradation angle are determined.Japan Die Casting Association standardized the details again and indicated length tolerance, angle tolerance, flatness tolerance, and eccentricity tolerance.

The Mechanical Properties Of Die Casting

The mechanical properties of die casting show the measured values ​​of the simple shape individual molten metal injection test pieces and the measured values ​​of the test pieces cut from mass-produced products. In general, the former is larger than the latter. ASTM test pieces are distributed as individual molten metal injection test pieces.

The strength of die casting cannot be guaranteed as a substitute characteristic. Apply a load corresponding to the actual and practical load to the die casting to destroy it, and obtain a numerical value that can be statistically guaranteed to withstand the load, for example, the lower limit of 3σ.

Die Casting Defects And Countermeasures

The extent to which defects are allowed depends on the required quality of the product, so the limit should be clearly defined when trading.

(G) Japan Die Casting Association has suggested casting surface standards and foam standards. There is also a new defect name called Fracture Layer. It is explained that the solidified layer generated in the injection sleeve of die casting is an abnormal tissue that is broken by the flanger and flows into the molten metal into the cavity. The strength of the interface between the fractured layer and the normal tissue is significantly lower than the strength of the normal tissue as it is inserted at less than 9kgf/mm². This is the cause of extremely lowering the strength of the die casting. According to the degree of demand for the strength of die casting, the development of a method for preventing the occurrence of a fracture layer is in progress. Methods to increase the heat retention of the molten metal in the sleeve just before injection, such as the ceramic sleeve method and the powder lubrication method, are being sought.

New Die Casting Method

Die casting has been quantitatively expanded by using high productivity and good flow of hot water for thin products as sales points. However, the high-speed charging that realizes it, on the one hand, cannot avoid air bubbles due to mixing.

may be the cause Several new die casting methods have been developed in response to product design requirements such as filling, airtightness, and strength leveling as castings, and heat treatment or welding.

(1) Vacuum Method

The history of vacuum method is quite old. Methods currently industrially known include the GF method, the mass vent method, the shutter-off pin method, the RSV method, the superback method, the MFT method, and the VACURAL method. The vacuum method widely used in Japan is the GF method.

(2) PF Method

Also called non-porous die casting. The principle is to eliminate air bubbles by purging the mold cavity and sleeve with oxygen, mixing oxygen with the molten metal in the spray state by high-speed injection, and fixing oxygen with Al₂O₃. Die casting made by PF method can be solution heat treated and artificial aging heat treated. Sometimes welding.

(3) Local Pressure Method

After filling the mold cavity with the molten metal, a local pressure higher than the casting pressure is applied to the molten metal or the reaction solid in the cavity by pressing a pressure pin by a predetermined stroke. There is an effect of filling the voids of the decrease in the cavity volume caused by such pressurization. It is effective as a countermeasure against air bubbles in the thick part isolated in the part away from the gate.

(4) Hot Chamber Method

The hot chamber machine method is named because the injection mechanism is immersed in the molten metal. Since the steel injection mechanism part is easily eroded by the molten aluminum alloy, a hot chamber machine is usually not used for aluminum alloy die casting. However, if this method can be applied with high productivity, high level of automation, and stability of molten metal quality, new demand development can be expected for aluminum alloy die casting. In 1987, the Small and Medium Business Corporation tested a hot chamber die casting machine with a clamping force of 2.5MN. Ceramic materials such as silicon nitride are used for parts in contact with molten aluminum alloy. As a result of the operation test, improvement in quality, slimming, productivity improvement, and energy saving can be expected.

(5) Collapsible Core Method

One of the disadvantages of die casting is the restriction on the undercut shape. One of the solutions is to use a metal neutralizer setting. Another method, which is a collapsible reactor, uses salt or silica sand as an aggregate.

The Development Of Die Casting

The global aluminum die-casting market is expected to show continuous growth in accordance with the trend toward lighter weight of parts used in the automotive and aerospace fields.

Grand View Research’s ‘Global Aluminum Die Casting Market’ report that contains such content forecasts that it will grow at a CAGR of 5.1% from 2021 to 2028, reaching $35.64 billion in 2028.

Aluminum die casting is a process of injecting molten aluminum by applying pressure to a mold, and is divided into pressure die casting and other processes depending on the production process.

According to the report, high pressure die casting manufacturer (HPDC) in the production process sector accounted for the largest revenue share in 2020 and this trend is expected to continue through 2028. This is explained by the high preference for HPDC among casting manufacturers due to the high efficiency of the process.

It also points out that increasing demand for aluminum die casting or zinc die casting products is intensifying competition in the market, leading market players to gain a competitive edge through strategic initiatives such as mergers and acquisitions (M&A) and increased production capacity and to gain a competitive edge in losses from the impact of COVID-19. expected to recover.

Aluminum alloy die-casting products are mainly used in electronics, automobiles, motors, home appliances and some communication industries. Some high-quality aluminum alloy thin wall die casting products with high performance, high precision and high toughness are also used in large aircraft, ships and other industries with relatively high requirements. . The main use is still on the parts of some instruments.

Casting aluminum alloy ingot production process: electrolytic aluminum liquid, waste aluminum ingot, scrap – batching – smelting tool preheating – slag removal in ladle – furnace loading – mixed smelting – furnace temperature control – slag removal and degassing – casting tool preheating ——Open the furnace hole to release molten aluminum – pouring – slag – cooling into indium – inspection – coding – packing – finished casting of aluminum alloy ingots.

Smelting operation: As described above, the pouring process is basically the same as that of ordinary casting, and the specific operations are related to the smelting of aluminum alloys and the casting of aluminum ingots for remelting.

It is mentioned in the die casting theory of aluminum die castings that continuous casting of horizontal ingot molds is the most commonly used casting method in aluminum electrolysis plants. Aluminium ingots for remelting of aluminium and aluminium alloys. A special volume die casting machine is used to realize this casting.

The horizontal continuous ingot casting method is a casting method with a high degree of mechanization of the block iron mold ingot casting method. The die casting mold technology is relatively simple. Because the aluminum alloy ingots for remelting are produced, the defects on the surface of the ingots and the requirements for the internal crystalline structure are relatively not strict. There are still requirements for pinhole grades inside the ingot. For the specific requirements of die casting ingots, please refer to the standard “Casting Aluminum Alloy Ingots”

Die Casting Process Control

The requirements for the process of horizontal continuous casting are mainly pouring temperature, pouring speed and water cooling control(The Theory Of Aluminum Die Casting).

1. Pouring temperature The casting temperature of aluminum and aluminum alloy ingots for re-cultivation is different due to the different alloy varieties. In general, the pouring temperature of common aluminum and deformed aluminum alloys is in the range of 30-80 degrees above the crystallization temperature of the alloy. Cast aluminum alloys are in the range of 30 – 50 degrees above the crystallization temperature.
2. Pouring speed Horizontal ingot mold continuous casting is a fixed casting machine. Different types of casting machines have different casting speeds. The casting speed is adjustable, and the casting speed is expressed by the travel speed of the mold. But to be more intuitive, foundries generally test casting speed by casting several ingots per minute. It should be emphasized that the casting speed should not be adjusted too fast, otherwise, it may cause the die casting machine to vibrate greatly, and the ingot will have serious ripples and surface oxidation.
3. Cooling control The cooling method of the horizontal ingot mold continuous casting machine is divided into two types: one is the forced water-cooling type immersed at the bottom of the casting mold, which mainly controls the inlet water temperature to be below 40 degrees and the return water temperature to be below 60 degrees. The other is the natural cooling method of the ingot, but in order to ensure the normal operation of the casting machine, it is necessary to reduce the temperature of the casting mold, and spray cooling with water before or after the demoulding of the ingot, so as to reduce the temperature of the casting mold, that is, to avoid die casting mold cost.The equipment failure that may occur in the high temperature operation of the casting machine is also conducive to the demolding of the ingot and the stability of the process conditions. This cooling method generally requires the water spray temperature to be below 40 degrees.

If you’re designing volume die casting of a part or product, choose a manufacturing process that can build it using the same material. In metal die casting, you can consider the process of cold chamber die casting process, which can build parts from different metal materials one layer at a time. Cold chamber die casting services is a injection chamber and the injection punch are not immersed in the molten metal, but a quantitative amount of molten metal is poured into the injection chamber and then injected. ,. This way, it can create highly complex shapes when other manufacturing methods can’t.

However, you need to know the best metals that can be used for your display die casting or other project. Choosing the correct metal will ensure optimum results and an effective die casting process that will improve your chances of success.

Which metals can be used in die casting?

Which Metal Should You Choose For Die Casting?Reputable manufacturers offer a range of materials, such as aluminum, zinc, copper, and magneium. These metals come with various properties, making them ideal for a range of applications. For instance, if you require volume production of automotive parts, pipes, or valves; aluminum and aluminum alloy can be a good option for offering outstanding corrosion resistance.

Metals to avoid in die casting

Any metal may be used in die casting if it can be supplied as an appropriate metal. However, materials that burn instead of melt at high temperatures should be avoided as they cannot be melted safely or sintered. Metals to avoid in die casting:

• Stainless Steel
• Titanium
• Greek Ascoloy.
• Carp 49
• Hastelloy
• Nitronic-60
• Inconel
• Hymu 80
• More

Benefits of Die Casting with High Volume

High Volume Thin Wall Die Casting and cnc machining is a versatile metal manufacturing technology that lets you build functional metal rapid prototypes and parts with complex shapes or geometries. It’s used extensively in the medical, automotive, and aerospace industries for fulfilling part consolidation and weight-saving application requirements. Creating prototypes and low-volume end-use parts out of Thin Wall Die Casting metals are typically detailed but not necessarily structurally sound.

Getting your product from the drawing to a tangible version is a crucial aspect of design. Without it, you have no way to test and validate your design before it’s finalized for mass production. Die casting is one of the ways you can bring your designs to life. It involves die casting – molds manufacturing – CNC machining, which delivers high precision, fast, and durable prototypes of parts from a billet or block of your chosen material that is cut with a series of drill bits and tools.

Are you considering die casting for your project? Be sure to consider these Key Elements to Consider Before Proceeding before you proceed:

Die Casting Materials

Die casting allows you to volume make your model with almost all kinds of materials that can withstand heat and stress. Some of the most popular materials used are aluminum, zinc, and special alloy like magneium and copper.

Die Casting Machining methods

Die casting uses the cavity of the mold to apply high pressure to the molten metal. Molds are usually machined from stronger alloys, a process somewhat similar to injection molding.

Your Die Casting project

Die casting is used typically for volume building high-quality prototypes for functional testing. However, it’s also practical for crafting custom casts or molds to build prototypes for other production processes, such as injection molding. In this case, the CNC machining prototyping process also qualifies as rapid tooling.

Die Casting Tolerances

CNC machines can be very accurate, but running the mill on the highest accuracy can be time-intensive and costly. That’s why tolerances are used, and these are measurements indicating the level of precision required for the prototype you’re making. In short, they represent the degree of variation permitted in the measured value or final dimensions of the part. Reputable providers of CNC prototyping and edm wire cutting services control their tolerances to DIN-2678-1 Medium for Fine for metals.

High Volume Manufacturing Parts test of your design is a must as it allows you to test your die casting product(as lighting die casting parts) and refine your ideas. That makes it an important aspect of the product development process. While it can be expensive and time-consuming, you have the option to outsource it to a reputable CNC Machining service. Thus, you can focus on other areas of your project and ensure the speedy and accurate creation of an aesthetic or functional model for your design.

During Precision Machining, your research and development team can identify and validate promising concepts based on the design samples. A prototype allows them to test the design’s core features with users to have a clearer idea of how the concept can meet the market demand. It also lets them make the necessary adjustments to the design before it goes into final production.

Here are more top advantages of CNC Machining die casting parts services:

Reduce product development expenses

The CNC Machining service eliminates the need to purchase your die casting molding material and manufacturing devices. This way, you can save time and money while ensuring that your final product can be realized faster and cost-effectively, with better ROI.

Avoid product failure

The service provider can ensure accurate and precise manufacturing of your CNC Machining samples based on your exact design. This way, product designers can identify any flaws and make corrections or improvements. Moreover, it ensures a more ergonomic way to identify and evaluate product hazards.

Functionality testing

The CNC Machining samples shows the exact function and aesthetics of your product.CNC Machining and Surface Treatment services will ensure speedy results so you can test and retest quickly and find ways to fine-tune your ideas.

Access to more technologies

A reputable rapid cnc prototype machining service offers a range of technologies and solutions to create functional or aesthetic products. These include Metal 3D printing, vacuum casting, injection molding, and CNC machining.

Make sound decisions

Established providers of cnc machining services in China can review your project for free. It’s a great chance to learn how they can help you, especially if you’re unsure which die casting methods are best for your design.

Some product manufacturers may be looking for a better die casting company, while others are new to outsourcing the service to a third party. No matter your situation, you require a dependable provider of online die casting services that can deliver high-precision parts fast. While there’s no shortage of options online, you may find it hard to choose the most suitable service provider. After all, your choice could mean the difference between your project’s failure and success. We’ll share the things you must consider to increase your chances of hiring the best die casting service provider online:

Online Die Casting Experience

Look for a die casting company or manufacturer with at least ten years of experience in providing online die casting services. Consider their experience in your industry, too. You could gauge their capabilities by exploring case studies and reading the customer testimonials. Just remember to take the latter with a grain of salt.

Online Die Casting Equipment

An online die casting service must have the right equipment to take on any project. Know the systems and technologies they use, such as surface grinding machines, sink and wire EDMs, lathes, and CNC mills. See if they have three, four, or five-axis machines, too. Reputable companies usually share them on their website to assist you make an informed choice to hire them. To ensure timely delivery, determine the number of die casting systems they have to ensure they have enough to accomplish your project on time.

Online Die Casting Standards

Ensure tight tolerances for die casting services. Reputable companies control tolerances to DIN-2768-1 Fine for metals and Medium for plastics as the standard.

Online Die Casting Certifications

Established online precision metal die casting services are accredited and certified by relevant entities, like ISO and IATF. Be sure they operate an ISO 9001 QMS qualified facility, and adhere to ISO 9001:2015 requirements. Competent service providers can also provide quality assurance reports and material certifications.

Online Die Casting Project review

Some online die casting services can review your project for free to help you plan accordingly. They can provide tips for designing your product(as medical die casting parts) and recommend other applicable services if required.

Are you looking in China for a die casting parts manufacturer? You might be overwhelmed by the many available options, especially when finding which china die casting company is dependable and trustworthy. The last thing you want to receive low-quality results that can waste your time and money and compromise the safety of your end product. To save you from the guesswork, we put together some tips to help you find the best die casting service and parts manufacturer in China.

Narrow down the options

Choose a China die casting parts manufacturer with extensive experience in volume end-use manufacturing. The company must be IATF 16949:2016, ISO 14001, and ISO 9001:2015 certified. It should have a multilingual team of experts that speaks your language, so the language barrier will be the least of your worries when collaborating with them.

Discuss your needs with Die Casting manufacturer

Consider your timeline and ensure the manufacturer can finish and deliver your project within the agreed period. Reputable die casting services can review your project for free to understand your requirements and make recommendations that may help reduce the costs and speed up the completion of your project.

Verify their Die Casting process and technologies

Find out the tolerances used by the China die casting parts manufacturer for metal and plastics. Reputable manufacturers control tolerances to DIN-2678-1 Medium for plastics and Fine for metals. They have a good selection of high-precision mills, die casting machine,sink and wire EDMs, lathes, axis machines, surface treatment and grinding machines, and other equipment to ensure the timely delivery of custom die casting parts. The manufacturing process should include a thorough quality check.

Verify their Die Casting experience

Check their case studies and explore customer testimonials. These can help determine if they have worked on projects similar to yours. Remember not to take the reviews at face value.

Ensure reliable customer service

Consider a China die casting parts manufacturer that maintains open communication with its clients. They should update you on your project’s progress and promptly inform you of important matters.