PRO-COOL Screws Cleaning Machine
Ensuring the feed screw and barrel remain in top condition is an essential part to achieving processing goals. Over time and under continuous operating conditions, the feed screw and barrel will experience wear. You will need both cleaning tools and measuring tools to ensure accuracy of your measurements. PromaXX provides Maintenance Equipment to our valuable customers in the daily maintenance of Feed screw and Barrel.
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Coating of screw taps: What you should know
The base material plays a crucial role in the performance of a screw tap, directly impacting its **quality and durability**. However, it's not just the material that matters—surrounding processes also significantly influence the tool’s characteristics and overall quality. Since the surface is the part most exposed to wear and corrosion, most screw taps undergo **surface treatments or coatings** before being sold.
Surface treatments and coatings offer numerous benefits. They enhance **resilience against wear and environmental factors**, extending the lifespan of the taps. Additionally, they improve surface quality and allow for higher cutting speeds. Some coatings are specifically tailored for certain materials, making them ideal for challenging applications.
Today, there are many variations and combinations of screw tap coatings available. Customers can also inquire about custom coatings from BAER, a leading manufacturer of screw taps. We aim to clarify the wide range of **tap coatings** and help you choose the right one for your needs.
### The Most Common Surface Treatments
Surface treatments alter the **material properties** of the screw tap without adding any external layers. Here are some common methods used:
#### Nitriding
Nitriding involves exposing the screw tap to a **nitrogen-rich atmosphere** under heat, forming a hard surface layer. This treatment increases hardness, improves wear resistance, and enhances sliding properties. It is especially suitable for materials like cast iron, high-perlite steels, titanium alloys, and other tough materials.
#### Vaporizing
Vaporizing is a **steam-based treatment** that creates a crystalline iron oxide layer on the surface. This reduces friction and improves lubricant adhesion, preventing buildup and cold welding. However, it is **only suitable for iron-based materials**.
#### Calduring
Calduring combines **nitriding and vaporizing**, offering dual benefits. It is particularly useful when working with materials that are both tough and abrasive.
#### Hard Chromium Plating
Hard chromium plating adds a **hard chrome layer** through electrolytic deposition. This improves sliding properties and reduces surface roughness. It is often used for machining **low-strength materials** like copper and its alloys, but the temperature must remain below 250°C to maintain effectiveness.
### The Most Common Screw Tap Coatings
For improving surface properties, **coatings** are often the most cost-effective and environmentally friendly solution. The **PVD (Physical Vapour Deposition)** method is commonly used for applying these coatings. Let’s take a closer look at how this process works.
#### The PVD Process
PVD is a **vacuum-based coating technique** where the coating material is first vaporized and then deposited onto the tool. This forms a thin, durable layer that enhances performance.
#### TiN (Titanium Nitride)
TiN-coated taps have a **gold-yellow appearance** and offer a micro-hardness of 2,200 HV with temperature resistance up to 600°C. It is a general-purpose coating suitable for soft to medium-hard steels, cast iron, and non-ferrous metals. These taps can be recoated up to five times.
#### TiCN (Titanium Carbonitride)
TiCN provides exceptional **mechanical strength** with a micro-hardness of 3,000 HV and temperature resistance up to 400°C. Its gray-violet color makes it ideal for high-strength steels and abrasive materials. However, it has limited heat resistance, so proper cooling is essential.
#### TiAIN (Titanium Aluminum Nitride)
TiAIN offers **excellent heat resistance** and chemical stability, with a micro-hardness of 3,300 HV and temperature resistance up to 800°C. It is ideal for high-speed cutting and difficult-to-machine materials. Taps coated with TiAIN can also be recoated multiple times.
#### Other Coatings
Beyond TiN, TiCN, and TiAIN, there are many specialized coatings. For example, **X. TREME** combines the properties of all three, while **CrN (Chromium Nitride)** offers excellent thermal stability and corrosion resistance. A **multilayer coating** with a glide layer is perfect for dry machining.
If you're unsure which surface treatment or coating is best for your project, don't hesitate to reach out! Our team at BAER is here to help you find the right solution. All the coatings mentioned are available in our online shop, or we can produce custom-coated taps based on your specifications. Let us help you achieve the best results for your application.