The Ultimate Buyer's Guide for Purchasing what is porosity in metal

21, Oct. 2024

 

Casting Buying 101: Learn the Basics

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Metal Casting Buying 101: A Comprehensive Guide for All Your Needs

For many industries, the task of purchasing components made of cast aluminum is essential. At Boose Aluminum Foundry, we pride ourselves on being an industry-leading foundry specializing in providing top-quality aluminum sand castings for many different applications.

With expertise in the sand casting process, we ensure our customers receive the ideal solution tailored to their needs. This guide aims to provide valuable insights into the casting process, helping you make informed decisions when sourcing castings.

How Do You Select the Right Casting Method?

To select the proper casting method, consider the desired material properties, the part's complexity, production volume, and budget constraints. Then, evaluate various casting techniques, like sand casting, permanent mold, investment casting, and die casting, to determine which method best aligns with your project requirements and goals. When choosing a casting method, consider the following factors:

  • Material compatibility: Ensure that the casting method suits the specific material you plan to use.
  • Production volume: Some casting methods are more cost-effective for low production volumes, while others are better suited for higher volumes.
  • Complexity and detail: Certain casting methods can produce more intricate and detailed parts.
  • Surface finish and dimensional accuracy: The casting method will affect your cast components' final appearance and accuracy.

Casting Methods

Several types of castings are available in the market, each with unique properties and applications. Some common types include:

  1. Sand casting: This is the most widely used casting method, where a sand mold is created to form the desired shape. It is suitable for ferrous and non-ferrous metals. With relatively low upfront foundry tooling costs, it is most cost-effective for low, medium, and occasionally high production volumes.
  2. Permanent mold casting: This method uses a reusable mold made of metal, allowing for better dimensional accuracy and surface finish than sand casting. It is suitable for non-ferrous metals like aluminum and magnesium. With medium to high upfront foundry tooling costs, it is most cost-effective for medium to high production volumes.
  3. Investment casting: Also known as lost-wax casting, this process involves creating a wax pattern, coating it with a ceramic material, and then melting the wax to create a ceramic mold. It offers high precision and is ideal for complex shapes and intricate details not possible with sand casting. It is suitable for ferrous and non-ferrous metals. With relatively low upfront foundry tooling costs, it is most cost-effective for low, medium, and occasionally high production volumes.
  4. Die casting: In this method, molten metal is forced into a reusable die under high pressure. Die casting is suitable for non-ferrous metals and produces parts with excellent dimensional accuracy and surface finish. With relatively high upfront foundry tooling costs, it is most cost-effective for high production volumes.

Aluminum Metal Casting

Compared to ferrous materials like cast iron and carbon steel, aluminum boasts a lightweight nature while maintaining impressive strength, making it ideal for various applications. Furthermore, aluminum castings provide excellent heat dissipation and corrosion resistance, greatly contributing to the overall casting quality and functionality.

Aluminum's adaptability to various casting processes enables manufacturers to determine the most efficient method for their specific needs, ultimately leading to cost savings for both the supplier and customer. Additionally, aluminum alloys offer a wide selection of material properties, ensuring that engineers and purchasers can find the perfect alloy for their project requirements.

How Can You Find a Reliable Casting Supplier?

It's crucial to source castings from a reliable supplier to ensure consistent quality and timely delivery. Here are some tips for selecting a casting supplier:

  • Research: Conduct thorough research on potential suppliers, including checking their reputation, certifications, and experience in your industry.
  • Request quotes: Depending on your circumstances, it might be helpful to obtain multiple quotes from different suppliers to compare prices, lead times, and other terms.
  • Ask for samples: Request samples or images of the supplier's previous work to evaluate their quality and craftsmanship.
  • Communication: Establish clear communication channels with your supplier to ensure smooth collaboration and timely updates on production progress.

Quality Control and Inspection

Implementing strict quality control measures and conducting regular inspections are critical to ensure the castings meet your specifications. Some common inspection methods include:

  • Visual inspection: Check for surface defects, such as porosity, cracks, and inclusions.
  • Dimensional inspection: Verify that the castings meet the specified dimensional tolerances using measuring tools like calipers, micrometers, laser scanners, and coordinate measuring machines (CMMs).
  • Non-destructive testing (NDT): Techniques like radiography, ultrasonic testing, liquid penetrant inspection, and magnetic particle inspection can detect internal defects without damaging the casting.
  • Destructive testing: Tensile, impact, and hardness tests can provide valuable information about the casting's mechanical properties and performance under stress.

By following this guide, you can make informed decisions when buying castings, ensuring you select the suitable method, supplier, and quality control measures for your specific needs.

Want to Talk to The Experts on Casting Buying?

When you're ready to purchase casting materials, the experts at Boose Aluminum can help. We deliver lightweight, durable, and corrosion-resistant cast parts by leveraging aluminum's excellent mechanical properties and cost savings. Our commitment to casting quality and customer satisfaction makes us a preferred choice for casting buyers across numerous sectors. Get in touch with us today to get started!

Resources

The Complete Guide to Buying Metal Products

AISI

Stands for American Iron and Steel Institute. The institute serves as the voice of the North American steel industry. AISI numbers are used to categorize metals by alloy type and carbon content, and they do it with four digits. The first two digits of an AISI number refer to the alloy type, and the second two digits refer to carbon content.

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ALLOY

A metal made by combining two or more metallic elements. An alloy typically possesses qualities different from those of the components used to create it.

ASM

Stands for American Society for Metals. ASM International is the world's largest association of metal material engineers and scientists. The association engages and connects materials professionals and their organizations to the resources necessary to solve problems, improve outcomes, and advance society.

ASTM

Stands for American Society for Testing and Materials. ASTM International is a not-for-profit organization that develops standards for materials, products, systems, and services. Metal with an ASTM designation meets the international standards for quality and regulations.

CUT-TO-LENGTH

This process levels coil into a flat sheet or blank. The service provides better length and width tolerances than sheared product, and it can improve diagonal tolerances as well.

DEBURRING

Cutting metals can leave behind burrs, which are unwanted raised edges or protrusions. Deburring is the process of removing these burrs with a tool.

DRAWING

Drawing is a metalworking process that uses tensile forces to stretch metal. As the metal is drawn, it stretches thinner, into a desired shape and thickness.

DRAWING TEMPERATURE

Drawing is usually done at room temperature, classifying it as a cold working process. However, it may be performed at elevated temperatures during special applications like on large wires, rods, or hollow sections in order to reduce forces.

ELONGATION

A metal fabricating term that refers to the degree to which a material can be bent, stretched, or compressed before rupturing. A metal's elongation is a point between tensile strength and yield strength, and it is typically expressed as a percentage of the original length.

GAUGE

The thickness of sheet metal in the USA is commonly specified by a traditional, non-linear measure known as its gauge. The larger the gauge number, the thinner the metal.

HEAT LOTS OR HEAT NUMBER

A heat number is an identification number that is stamped on a material plate to prove it meets industry quality standards which require materials to be tested by the manufacturer. The heat lot or heat number is used to identify production runs for quality control purposes.

EDGE ROLLING

Edge rolling is the process of adding finishing edges to metal. It forms the edge of a strip to the desired shape beyond that of a standard slit edge.

MIL STD

Stands for Military Standard. This classification establishes uniform engineering and technical requirements for military-unique or substantially modified commercial processes, procedures, practices, and methods. In order to qualify, materials have undergone rugged, exact testing, equal to the exigencies of combat use.

NORMALIZING TEMPERATURE

Normalization is a heat treatment that relieves stress on steel to improve ductility and toughness in steel that may harden after the cold working process. During normalization, steel is warmed to a temperature just above its upper critical point. Normalized heat treatment facilitates a more uniform final product.

ROCKWELL SCALE

The Rockwell Scale indicates the hardness of materials. Rockwell hardness numbers are most often used to describe the hardness of metals, although they are also used for some plastics. The Rockwell scale is based on measuring the depth of the indentation made by pressing a diamond point into a material.

SAE

Stands for Society of Automotive Engineers. SAE International is a global association of engineers and related technical experts in the aerospace, automotive, and commercial-vehicle industries. Materials meeting SAE standards are internationally recognized for safety, quality, and effectiveness.

SLITTING

Slitting is a precise shearing process, but instead of making cuts at the end of a workpiece like shearing, slitting cuts a wide coil of metal into a number of narrower coils as the main coil is moved through the slitter. During the slitting process, the metal coil passes lengthwise through the slitter's circular blades.

TEMPER

Temper refers to reheating hardened, normalized, or mechanically worked steel to a temperature below the critical range to soften it and improve impact strength. Tempering results in greater toughness by decreasing an alloy's hardness.

TENSILE STRENGTH

The maximum stress a material will withstand before fracturing or breaking. The ultimate tensile strength is calculated from the maximum load applied during the test, divided by the original cross-sectional area.

UNS DESIGNATION/NUMBER

Stands for the Unified Numbering System for Metals and Alloys. UNS designation provides a means of correlating internationally used metal and alloy numbering systems currently administered by societies, trade associations, and those individual users and producers of metals and alloys. This system is meant to avoid the confusion caused by using more than one identification number for the same metal or alloy, and the opposite situation of having the same number assigned to two or more different metals or alloys.

YIELD STRENGTH

The amount of stress a material can withstand before causing permanent deformity.

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