Powdered Metallurgy vs. Machining for Medical Device Components

Both additive and subtractive manufacturing have unique advantages that make them beneficial for specific operations. Machining is a subtractive process with tools and machinery that carve away excess material from a workpiece to create a specific design. Powdered metallurgy is an additive process that uses sintering to compress metal powders with enough heat and force to solidify the metal into a precise shape.

Medical device components on high-performance, complex pieces, as well as in modern medical devices, are increasingly miniaturized. Compare these two popular metal manufacturing techniques to determine which one is the best fit for your products and designs, based on production time, costs, part strength, precision, material waste, self-lubrication, and ability to handle different designs for precision medical device demands.

Production Time

Production time is one of the most important concerns for modern production. Medical machining operations are fast, but each machining station can generally only produce one piece at a time, creating a significant bottleneck for medium- and high-volume orders. Powdered metallurgy requires upfront tooling at the start of a new project, which can add to initial orders.

However, that constraint disappears for subsequent orders, halving lead times. Compax has a reputation for speed, completing tooling and powdered metallurgy goods within eight weeks and requiring approximately four-week lead times for subsequent orders.

Production Costs

Powdered metallurgy is a more cost-effective production technique compared to machining. The process is efficient, fast, and produces less material waste, resulting in lower costs than machining. Machining requires expensive equipment and more material, which can drive up the costs.

Strength

Both powdered metallurgy and machined goods are strong. Sintered metal parts are highly durable and can handle heavy-duty applications. Machined goods have great load-bearing capabilities, but the process cuts through the grain of the metal and can cause structural weakness in some applications.

Precision

Both powdered metallurgy and machining are precision production methods. Powdered metallurgy has a slight edge in accuracy, meaning it can deliver both tighter tolerances and a smoother surface finish. Powdered metallurgy can handle very intricate component requirements.

Material Waste

Material waste is a critical point in both sustainability efforts and budgetary concerns. Not only are processes that generate high levels of waste less eco-friendly in a market that increasingly prioritizes sustainability, but they can also drive up the costs of metal goods, especially those made from rare or expensive alloys. Powdered metallurgy offers superior material utilization. It generates very little waste, as unused or excess powder can be recaptured and used for subsequent units.

Machining, on the other hand, tends to be a more wasteful production method. It cuts away material from the workpiece through cutting, drilling, milling, and other methods, and the carved-away excess often has to be disposed of. Workpieces also have to be ordered in a larger size to account for the processing, which can increase the price.

Self-Lubricating Capabilities

In applications that require gears and moving components, lubrication is a critical aspect of the assembly. Without lubrication, friction and heat can build up, causing degradation and failure. Sintered gears can be fabricated with self-lubricating capabilities if the parts are designed with the proper density. Because of the self-lubrication, ongoing maintenance and performance are simplified, which can increase brand reputation and customer satisfaction over time.

While sintered goods can be impregnated with lubricants, machined goods can be sealed or coated in long-lasting lubricating materials. While this doesn’t provide the same degree of protection, it can be an alternative.

Design Flexibility

Powdered metallurgy offers an excellent degree of versatility. It can produce three-dimensional shapes with complex forms. Engineers can also control the porosity. But both machining and powdered metallurgy can handle extremely intricate design demands for gears, miniaturized components, and more.

Contact Compax to Learn More About PM

Compax serves the following markets where precision and strength are key, with high-quality powdered metallurgy for complex and miniaturized components:

Sintering is a highly reliable, cost-effective production option for low or high-volume orders of quality medical device components. Whether you’re looking for timely production within eight weeks for initial tooling orders and four weeks for subsequent orders or you want additional inventory management services, Compax is here to help.

Contact us today to tell us more about your medical device production needs, or request a quote to start your order.