Die Casting

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What is Die Casting?

Die casting is a manufacturing process in which molten metal is injected into a mold or die under high pressure to produce complex shapes with a high level of accuracy and repeatability. The process involves melting the metal and injecting it into a steel mold or die at high pressure using a machine called a die casting machine. The mold is designed to have the exact shape of the desired part, and the metal is forced into the mold under pressure until it solidifies. Once the metal is solid, the mold is opened, and the part is removed. The finished part can then be finished, polished, or plated as required.

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Advantages of Die Casting

High Efficiency:The die casting process has a simple mechanism and is automated. Thus, it has a higher output that is a good thing, especially when the product demands high volume manufacturing.

Excellent Accuracy and Smooth Surfaces:Die casting has a high tolerance and even higher precision. Because of its high dimensional accuracy and high surface finish, you can expect the product to be of high quality. The product can be used directly, with less machining, and improves the utilization of the alloy. It also saves machining costs.

High Mechanical Properties:The melted metal in die casting cools quickly and it can crystallize under pressure. This layer of crystalline grains on the surface of the die casting is usually compact and fine. It contributes to the strength and hardness of the product.

Complex Thin-Walled Parts:The die casting process produces complex walls that are thin-walled, thinner than the ones produced by metal mold castings and sand castings.

Embedded Materials:In die casting, you can integrate the complex inserts and fasteners in the final product. This saves the materials cost and the cost of processing the part. It can even produce the most complicated shapes and the functionality of this part can be improved.

Easy for Mass Production:Because die casting can produce dimensionally stable and durable die-cast parts, there is no need for machining and in some less machining is required.

Different Surface Textures:The parts produced from die casting can have many finishing surfaces and techniques. This process also makes textured or smooth surfaces.

Types of Die Casting

Hot-Chamber Die Casting

It is the most popular type among the two die casting processes, and is sometimes referred to as gooseneck casting. The key feature of this process is that the cylinder chamber of the injection mechanism is immersed in the molten metal bath. Delivery of the molten metal into the die cavity is through a gooseneck metal feed mechanism, which gives the Hot-chamber die casting process its secondary name.

Cold-Chamber Die Casting

In this process, the immersion of the injection mechanism in the molten metal bath is eliminated. Instead, the melted metal is automatically or manually supplied into the injection system. Machine corrosion remains lower with such a design.

Low Pressure Die Casting

Vehicle wheels and other Aluminum components are fabricated using this process. The removal of the feeders from the process ensures high casting yields.

Vacuum Die Casting

Applications that have post casting heat treatment uses are made through this process. The advantages of this process include reduced turbulence and limited gas inclusions. Vacuum die casting also ensures enhanced strength and low porosity to the material.

Squeeze Die Casting

This process is mostly used for the strengthening of fiber, and it is mostly related to molten Aluminum. It allows for casting metals and allows much lower fluidity.

Semi-Solid Die Casting

It provides minimum porosity and maximum density into the casted material. Also called Thixo-forming, this process gives an added advantage of better precision; it is most commonly used for non-ferrous metals such as Magnesium and Aluminum alloys.

Application of Die Casting

1. Aerospace & Automotive Components
Die casting plays an integral role in the aerospace and automotive industries, where precision, quality, and durability are crucial. The need for high-volume production of complex parts like engine blocks, transmission cases, and wheel spacers makes die casting an optimum choice.
2. Connector Housings
In the realm of electronics, connector housings safeguard the vital connections between different components. With die casting, manufacturers can create customized connector housings with exact specifications and high repeatability. Die cast housings offer superior mechanical strength, excellent electromagnetic shielding properties, and resistance to environmental factors, ensuring the reliable operation of electronic devices.
3. Pumps And Plumbing Fixtures
Die casting is the backbone of the production of various pumps and plumbing fixtures. Its capacity to mold complex geometries makes it well-suited for producing impellers, pump housings, and valve bodies. The produced parts are not only dimensionally accurate but also robust and resistant to wear and corrosion, which is essential for the longevity of plumbing systems.
4. Outdoor Lighting
The outdoor lighting industry, too, greatly benefits from die casting.
Light fixtures, lampposts, and landscape lighting often require intricate designs and durability to withstand different weather conditions. Die casting allows for the production of lighting components with complex shapes, high-quality surface finish, and excellent thermal conductivity for efficient heat dissipation – a critical aspect of LED lighting systems.
5. Gears
Gears are quintessential to countless machinery and devices, and their production often employs die casting. With its ability to achieve tight tolerances and intricate geometries, die casting facilitates the manufacture of gears that can meet the specific needs of various applications, from automotive drivetrains to clock mechanisms.
6. Appliances
Home appliances represent another major application of die casting.
The process enables the production of diverse components like washing machine drums, refrigerator handles, light bulb holders, and more. Thanks to die casting, these parts can be produced in large volumes, maintaining consistent quality and exact dimensions.

What Materials Are Used in Die Casting?

Magnesium

Magnesium alloys are widely used for lightweight and high-strength parts. There are limitations in the processing, but magnesium alloys can achieve among the thinnest sections in die casting, because of very low viscosity in the melt.

Zinc

Zinc is very widely die-cast for many lower-strength applications. Zinc and commercial alloys it is a major constituent of are low-cost, easily cast, and sufficiently strong for many components such as enclosures, toys, etc.

Copper

Copper is not widely used in die casting, as it has a tendency towards cracking. It requires a high melt temperature, creating increased thermal shock in the tooling. When it is die-cast, it requires careful handling and a high-pressure process. For more information, see our guide on Copper.

Pewter

Pewter is a soft alloy, mainly tin, with antimony and traces of copper and bismuth. It is used purely for decorative objects and die casts easily in low-pressure equipment.

Aluminum

Aluminum alloys are by far the most important materials in volume die-cast production. They respond best to a hot chamber and high pressure—or more recently vacuum die casting—and provide moderate to high strength and high precision parts. Aluminum alloys are still critically useful in lower-tech processes, too.

Tin-Based Alloys

Tin-based alloys impose very low wear and stress on tools due to low viscosity and melting point. While high-tin alloys (other than pewter) are rarely used now, the need does arise and specialists exist to serve in this.

How Is Die Casting Performed?

Die casting is performed by pressing the cavity together using a hydraulic press to ensure that the closure faces are sealed. Some tools are heated while others are left cold to create the part. Filling of the cavity with molten metal can be low pressure (gravity feed or gravity die-cast) or high pressure (pressure die-cast) using a hydraulic ram. Higher pressure allows finer features and thinner sections to fill effectively. Lower pressure requires lower-cost equipment and lighter tooling, but it is only suited to simpler profiles and thicker sections. Fast processing tools for volume production are generally water-cooled, to speed solidification and reduce cycle times. However, cycle times are considerably longer than for the related plastic injection molding. The thermal capacity of metals is considerably higher, requiring bigger temperature reductions to reach an ejectable solid.

History of Die Casting

The die casting process was originally devised in 1838 to create “movable type” machines (think of a giant stamp with movable letters). The first patent related to the die casting process was eventually received in 1849 about 20 years later. When die casting equipment became available to the North American market the applicable uses spread as well. In the 1900s, a mixture of tin and lead were used for die casting and would go through several different trends before the use of aluminum became the best option.

Steps of Die Casting Process

Clamping
The first step in die casting is clamping. However, before then, clean the die to remove any impurities and lubricate the die for better injection and removal of the solidified product. After cleaning and lubrication, clamp and close the die with high pressure.

Injection
Melt the metal you want to inject and pour it into the shot chamber. The procedure depends on the process you are using. For example, the shot chamber is cold in the cold chamber die casting, while it is hot in the hot chamber die casting. After that, inject the metal into the die under high pressure generated by a hydraulic system.

Cooling

While clamped, allow the metal to cool for solidification. The solidified material will have a shape similar to the design of the mold.

Ejection

After unclamping the die mold, an ejection mechanism will push the solid casting out of the die. Ensure proper solidification before ejecting the final product.

Trimming

This is the final step, and it involves the removal of the excess metal in the sprue and runner found on the finished product. Trimming is achievable using a trim die, saw, or other procedures. The removed metal parts are recyclable and reusable in the process.

What Is the Difference Between Die Casting and Forging?

Die casting and forging are two distinct metal forming processes with notable differences.

Die casting involves forcing molten metal into a mold cavity at high pressure, resulting in intricate and detailed shapes with excellent dimensional accuracy. This process is ideal for producing complex, thin-walled parts with a smooth surface finish, making it suitable for applications like automotive components and consumer electronics.

Forging involves shaping metal by applying compressive forces through hammering or pressing at high temperatures. This method enhances the material's strength and grain structure, yielding robust and durable parts often used in heavy machinery, aerospace, and construction equipment. While die casting offers precision and complexity, forging excels in strength and structural integrity.

Factors That Affect Die Casting Costs

Generally, die casting has a low-cost production. However, the cost depends on several factors. Below are a few factors you can consider when tailoring the best for your diecast project cost-wise.

Material Selection

The type of materials you choose plays a huge role in the cost of die casting. Some materials are costly in value. Also, the price of die casting materials is generally increasing even though it looks erratic.

Production Cost

Production cost depends on three important factors: the tooling cost and die casting cost. Depending on the production processes you use, the technological approach, the mold manufacturing process, and maintenance, the tooling cost can be high.

Mold Cost

The cost of the mold depends on the manufacturing process used. For example, when using CNC machining, the capabilities and advantages of the process will contribute to a high mold cost.

Secondary Operations Cost

Secondary operations such as trimming will also play a role in the die casting cost. Therefore, the secondary operation cost's extent, efficiency, and effectiveness will be important in their cost.

Finishing Cost

The finishing cost also depends on the finishing method you are using. For example, methods such as electroplating will have a higher finishing cost when compared to painting.

Factors Ensuring Precision In Die Casting

Mold Design & Quality

The mold, often made from hardened steel, dictates the final shape and features of the part. Expert engineers craft these molds, ensuring every micro-detail is perfect. High-quality molds maintain their shape and integrity even after thousands of casts.

Material Consistency

By maintaining a consistent molten metal temperature, die casting machines can ensure that each batch has the same material properties. This results in parts with consistent strength, weight, and durability.

Precision Machinery

Modern die casting machines are equipped with sophisticated sensors and controls, allowing for precise regulation of parameters like pressure and temperature, further enhancing accuracy.

Key Steps In Quality Control For Die Casting

Design Evaluation

Before any actual casting begins, the mold design is critically analyzed. This involves: Assessing the mold’s ability to fill entirely without introducing air bubbles or inconsistencies. Ensuring that the mold design will allow for efficient cooling, reducing the chances of deformities.

Raw Material Inspection

The quality of the end product is only as good as the materials used. Hence: Suppliers are often vetted rigorously. Each batch of raw material is tested for purity and the correct alloy composition.

Process Monitoring

As the casting process gets underway, it’s vital to continuously monitor various parameters like temperature, pressure, and cooling rate. Any deviation can introduce flaws in the final product.

Post-production Inspection

After the part has been cast: Visual inspections are conducted to detect obvious external flaws.
More detailed inspections might involve techniques like X-rays to visualize internal structures and ensure there are no unseen issues.

How Can You Minimize the Die Casting Defects?

Porosity is the most common form of defect in diecast parts. It is very difficult to eliminate a porosity defect from a casting completely. You have to maintain strict quality control during several stages of production. During melting the metal, we suggest using additives to release dissolved gases from it.

Use lubricants in the die after each casting process to reduce the chances of inducing porosity in the surface. During the casting process, you can get the best results by creating a vacuum inside the cavity. It can greatly reduce the chances of having entrapped air in hard-to-reach areas of the part.

Improper design and too much injection speed can cause turbulence in the flowing metal. Thus, it can cause porosity as well. So, properly design the mold and run mold flow analysis to determine a proper shot speed.

Several other forms of defect may occur while filling the die cavity, such as cold shuts and misruns. Taking the aforementioned mentioned measures can help mitigate these issues as well.

Some problems can occur during the solidification process as well. Bad design or timing can cause shrinkage defects. It can cause damage in both casting and the die itself. You can deal with it by improving the part and die design. For instance, remove hot spots in design, add gates and runners in die.

Top 5 Safety Measures in Die Casting

1. Use of Personal Protective Equipment

The first step to keeping your employees safe is ensuring they are using proper PPE. This means using masks and gloves, as well as safety shoes and glasses. If you don't have the PPE available at your facility, consider purchasing a set of basic respiratory protection for each employee who works in die casting.

2. Do Not Use Any Equipment or Materials That Are Defective

Before starting the die cast process, check the placements to see if it is in the right place and equipment is in good condition. If you find any defects, do not use them until they are fixed or replaced by another die casting equipment. Do not use any equipment or materials that do not have a valid certificate of safety. Sometimes the quality of the materials or equipment like ladle, cope, and drag might have torn down due to their long usage.

3. Maintaining a Clean and Organized Workplace

Maintaining a clean and organized workplace is one of the most important steps in maintaining safety for your employees. It's also essential for keeping your company running smoothly, as well as helping reduce health hazards. Here are some ways you can make sure that everything stays in its place: Cleaning up immediately after finishing any work on a die casting process or other pieces of equipment by disposing of waste properly.

4. Implementing a First Aid Program

As it said, prevention is better than cure: One must always be prepared for the uncalled situations that may occur. Implementing a first aid program is an important step in ensuring your employees are trained and equipped to handle any injuries that may occur. First Aid Kits: All employees should always have a first aid kit on hand, as well as other items like gloves, eye protectors, and hearing protection.

5. Have an Emergency Response Team

You should have an emergency response team that can be relied upon to help you out in a crisis. This team will be responsible for handling all of the safety aspects of your die casting process, as well as any other issues that arise during it. The members of this team must have knowledge and experience working with people who are injured or sick at work; they should also have training regarding different chemicals and materials used in advanced die cast manufacturing processes. They must know how to respond quickly when there is an emergency situation.

Six Factors That Affect Die Casting Quality

Casting Pouring Position

Die Casting-featured imagePouring position is directly related to the number of die cores and parting surfaces, the filling position of molten aluminum alloy, the smooth exhaust, and the complexity of die structure.

Gating and Riser System

The casting quality is somehow determined by the gating and riser system, which should not only function as slag discharging, gas exhaust and feeding, but also ensure the reasonable solidification and cooling temperature field of castings.

The Positioning of Sand Core

The sand core positioning refers to the sand core head positioning in the die. The core head is used to fix the sand core so that it has an accurate position in the die and can withstand the gravity of the entire sand core and the buoyancy of the aluminum liquid during pouring, preventing it from being damaged.

Working Temperature of Mold

The temperature difference of each part of the die plays a vital role in the cooling temperature field of castings. For positions with thick walls on the casting, water cooling and air cooling systems are set at the corresponding positions of the die to ensure that these areas maintain normal working temperature, improve production efficiency, eliminate overheating and guarantee regular cooling temperature field.

Die Structure Designing

The limit between each part of the die should be reasonable. Sand cores should be positioned on the fixed modules of the die to ensure the accuracy of castings. Add gas extraction system at the proper position of the core head to make the gas produced by the sand core in the pouring process discharged well.

Casting Temperature and Pouring Speed of Aluminum Alloy

Casting Temperature
Casting temperature has great influence on gravity die casting quality.
Lower pouring temperature means poorer fluidity of molten aluminum alloy, which is easy to cause poor filling and lead to casting defects such as cold shut, short filling, gas porosity and slag inclusion.

Factors Affecting the Size of Die Castings

Molding compression is caused by the size of the error
Molding shrinkage is the main factor affecting the size of die castings. Because molding compression is a complex process, so the shrinkage rate has a wide range of choices. According to the external shape of the die casting and structural characteristics, respectively, select the size of each part of the appropriate molding shrinkage and determine the size of the molding, is to ensure that the die casting size accuracy of the key issues.

The manufacturing error of molding parts
The molding parts of the insert, mold processing datum, and the impact of processing technology.
Machining errors of molded parts.
Assembly errors of molded parts.
The error caused by the slope of the molded parts of the mold.

The influence of fluctuations in molding shrinkage during die-casting

The influence of die-casting molding process parameters, such as press injection ratio pressure and internal gate speed.
The effect of mold temperature.
The effect of the temperature of the die casting when the mold is removed.

The error caused by the phase time movement of the structural parts
Mold closing errors

The movement error of the side-drawing core and the movable core.
The error caused by the precision of the die-casting machine and the instability of the process performance.

Punching error

Molding parts by the impact of pressure injection deformation caused by the error.
Forming parts surface by the metal liquid or impurity erosion generated by the error.
Subject to pressure injection stamping, template, or forming parts to produce elastic deformation or plastic deformation and the formation of forming part of the size error.

How Temperature Affects Die Casting Materials?

Aluminum

Aluminum is the most popular metal used in die casting. There are different types of aluminum alloys commonly used for die caste products, such as 360, 380, and 413. In the case of aluminum 380, at 75 C°, its tensile strength is at 330 MPa, and yield strength at 165 MPa.
If we increase the temperature up to 212 C°, then its tensile strength decreases to 310 MPa and yield strength stays constant at 165 MPa. For aluminum 390, yield strength ranges from 282-124 MPa if we increase the temperature up to 500 C°.

Zinc

Zinc is also one of the most popular die casting alloys. The three most common zinc alloys include Zamak 3,5 and 7. They have an average 275 MPa yield strength at 75 C° and a 69 MPa yield strength at 275 C°. Other zinc alloys also show a similar decline in yield strength with an increase in temperature.

Magnesium

Magnesium alloys are popular as well , as they are generally light with unique fluidity properties. In the case of AZ91D magnesium alloy, the tensile strength is 142 MPa at 680 C°, this drops to 103 MPa if the temperature increases 100 C°. Similarly, yield strength also decreases from 123 MPa to 94 MPa with the same temperature change.

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The company was founded in 2010. The company started from a small workshop with 5 CNC machines. After experiencing a difficult startup period, the business grows rapidly. Three years later, we moved to a larger plant and added 10 milling machines and 1 lathes. In 2015, Kevin decided to enter foreign market. With the rapid expansion of international business, the company moved again to a new location with 1500m2.

Ultimate FAQ Guide to Die Casting

Q: What is a die casting?

A: In the performing arts industry such as theatre, film, or television, casting, or a casting call, is a pre-production process for selecting a certain type of actor, dancer, singer, or extra for a particular role or part in a script, screenplay, or teleplay.

Q: What is an example of die casting?

A: Other examples are hooks, toys, door handles, pumps, power tool housing, golf clubs and general engineering castings. They also make up the majority of products requiring the strength of a seamless metal part, like taps and pump handles.

Q: Why would die casting be used?

A: Die casting is characterized by high dimensional accuracy and allows for the mass production of thin-walled products with complex shapes. Die casting also has the advantage of producing smooth casting surfaces requiring less machining after molding.

Q: Is die casting expensive?

A: The unavoidable fact is that die casting tooling costs are high, among the highest of any production process. This is because, due to the nature of die casting, the dies are subjected to exceptionally severe operating conditions over the course of normal service.

Q: Is die casting hard?

A: Die casting is a metal casting process that forces molten metal into a mold cavity under high pressure. While steel is generally more challenging to die cast compared to other metals like aluminum or zinc, it is possible to die cast steel with specialized equipment and processes.

Q: Why is it called die casting?

A: It is called die casting because a "die" is a variably defined word for "tool". Most other casting processes such as sand casting and investment casting destroy the cavity in making a single part. Die casting is unique in leaving the cavity undamaged by casting a part.

Q: Does die casting use a permanent mold?

A: The process of permanent die-casting involves use of two molds. These molds are joined together and the heated metal is molded when poured into the molds. Some of the metals used in permanent mold casting are aluminum, zinc, tin and lead.

Q: Does die casting produce waste?

A: Firstly, by offering finished products that can be fully recycled by the end user when they are no longer required. It also keeps waste to a minimum as die casting produces very little scrap metal – although, crucially, any wastage can of course be recycled and re-used.

Q: Is die casting cheaper than machining?

A: Creating the die requires upfront time and resource investment, but once it's created, tens of thousands of identical parts can be manufactured at a relatively low per-part cost. Die casting may be more cost-effective in terms of volume, but CNC machining offsets the die cost.

Q: Does die casting need draft?

A: All die cast surfaces which are parallel with the opening direction of the die require draft (taper) for proper ejection of the casting from the die. This draft requirement, expressed as an angle, is not constant. It will vary with the type of wall or surface specified, the depth of the surface and the alloy selected.

Q: Is die casting fast or slow?

A: Due to the quick and repeatable nature of this process, die casting is the fastest process when it comes to producing precise non-ferrous metal parts.

Q: What is the coating for die casting?

A: Die cast tool coating offers various insulating properties to the metal and reduces thermal shock during the casting. These shocks can lead to roughness and defect in the final product, which may appear on the casting and make it less stable. PVD coating like Chromium Nitride is mainly used in die casting.

Q: Is die casting better than sand casting?

A: On the contrary, sand casting is faster and less complex to set up, but the production cycle takes longer than die casting. For this reason, die casting is better for high-production volume projects, and sand casting is better for low-volume projects.

Q: Does die casting use sand?

A: While both die casting and sand casting are used for a variety of components for a wide range of industries, the differentiation between the 2 casting methods is largely reflective of the mold types used. Die casting uses metal molds while sand casting uses sand molds.

Q: How sustainable is die casting?

A: Die casting, by contrast, uses a die. While more difficult to manufacture, dies can be used 100,000 times or more before needing to be replaced. This energy-efficient process thereby produces a much smaller carbon footprint than other manufacturing methods.

Q: Is steel good for die casting?

A: Chrome-molybdenum-silicon-vanadium steels have good hardening ability in oil and in air. Therefore, the hot-work steels have considerable toughness and plastic attributes through both regular and higher temperatures. So, it is a good traditional die-casting material.

Q: Why is aluminum not good for die casting?

A: When pressure die-casting aluminium it is not unusual that aluminium sticks to the cores and other parts of the die. This can result in increased production cost due to inadequate surface finish of the casting, extra cleaning of casting ancj/or die and even scrapping of the casting.

Q: Is tin good for die casting?

A: Tin is the first material to be die cast. Leaves little to no wear on the molds. As tin alloys have very low melting point and have great fluidity, they can be cast inexpensively. Easy casting techniques like centrifugal or gravity die cast can be used.

Q: What aluminum is used for die casting?

A: A few of the most commonly used aluminum alloys for die casting are A380, 383, B390, A413, A360, and CC401. The primary consideration when choosing an appropriate alloy is your intended application. For example, A360 offers excellent corrosion resistance, pressure tightness, and very good fluidity when molten.

Q: What is zinc die casting used for?

A: Zinc's high strength and hardness lend itself to many solutions and it's the ideal alternative to machined, pressed, stamped, and fabricated components. Many applications can be zinc die cast manufactured, including: Interior automotive aesthetic parts. Engine and other under-the-hood components.

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