High Quality Rivets for CNC Machined Parts(climb milling vs conventional milling Winifred)

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Rivets are a critical fastening component in many CNC machined parts and products. While rivets may seem simple, using the highest quality rivets ensures strength, durability, and reliability in the final product. Here’s an overview of how high quality rivets are specifically designed for CNC machining applications.
Material Choices
The material used for rivets for CNC machined components must be strong, durable, and corrosion resistant. The most common materials are:
- Aluminum: Aircraft-grade aluminum rivets provide high strength-to-weight ratio. Different aluminum alloys are chosen based on strength, hardness, and corrosion resistance needed.
- Steel: Steel rivets provide very high shear and tensile strength. Stainless steel and carbon steel are common choices, with stainless providing corrosion resistance.
- Titanium: Titanium rivets offer the highest strength-to-weight ratio and corrosion resistance. They are commonly used in aerospace applications.
- Copper: Copper rivets provide good corrosion resistance and electrical conductivity. They have lower strength than steel or aluminum.
- Plastics: Engineering plastics like nylon and polycarbonate can be used for lower stress applications. They offer corrosion resistance and electrical insulation.
The material is selected based on the specific application requirements - load stresses, environmental conditions, strength needs, and other factors. Aircraft-grade aluminum is the most common choice for CNC machined parts across many industries.
Head Styles
The head shape and size influences the installation process of the rivet and the clamping force provided. Common head styles include:
- Round head: Easy to install using automated riveting equipment. Provides lower clamping force than other head styles.
- Countersunk head: Flush surface for smooth aerodynamic surfaces. Requires a countersunk hole.
- Universal head: Allows flush or protruding installation. Increased clamping force over round head.
- Dome head: Provides the highest clamping force and shear strength. Requires specific tools for installation.
The head size is matched to the rivet diameter and hole size to ensure proper fit and clamping. Machined parts often use flush rivets like countersunk or universal heads for a smooth surface.
Shank Styles
Rivet shanks transfer load between the rivet head and tail. Shank types include:
- Solid shank: Simple, strong, and low-cost. Requires tighter hole tolerance.
- Extruding shank: Expands during installation to fill hole gaps. Easier insertion into holes.
- Breakstem shank: Shank snaps off during installation at a weakened break point. Allows for fast insertion into blind holes.

- Grooved shank:spaced grooves reduce friction during installation and add vibration resistance. Requires looser hole tolerance.
The shank style dictates the hole size and installation process. Extruding and grooved shanks are common for CNC machined parts because they allow for looser hole tolerances.
Tail Styles
The rivet tail binds materials together and transfers load into the shank. Tail options are:
- Closed (or cup) tail: Strong in shear and tension. Requires access to both sides of a joint for installation.
- Open tail: Allows installation from one side into a blind hole. Lower shear strength than closed tail.
- Forked tail: Provides the highest shear strength in one-sided blind hole joints. Material fits between the forks.
Closed tail rivets provide the highest strength but require two-sided access. One-sided open or forked tails are used where the back side is not accessible.
Manufacturing Process
Quality rivets for CNC applications are manufactured to precise tolerances and specifications. The manufacturing process includes:
- Heading: Rivet wire is cut to length then pressed in a die to form the rivet head.
- Shaping: The rivet shank, tail, and other features are formed using a series of dies.
- Heat treating: Rivets may be heat treated to increase hardness and improve strength.
- Plating: Zinc or cadmium plating can be applied for corrosion resistance and lubricity.
- Quality control: Dimensional tolerances, mechanical properties, and visual defects are inspected.
Computerized sensors, servos, and other automation ensures each rivet meets stringent requirements for CNC machined components. Consistent high quality is essential for optimized fastening performance.
Rivet Selection
With all the different options, careful selection is needed to choose the right rivet for any CNC machined application. Considerations include:
- Base materials being joined - aluminum components need aluminum rivets, steel needs steel rivets.
- Tensile and shear strength needed to withstand expected loads.
- Rivet head style based on installation equipment, fit with countersunk holes, and clamping force.
- Shank type to match hole tolerance and assembly method.
- Open or closed tail depending on joint accessibility.
- Material thickness - shank length must be matched to grip range.
- Environmental factors like temperature, vibration, and corrosive conditions.
- Product standards and testing requirements per industry or application.
With sound engineering analysis of these factors, the optimal rivet design and specifications can be determined for quality, reliability, and performance.
In summary, every characteristic of properly engineered rivets for CNC machined parts works together to create a robust, high-strength fastening solution. Detailed attention to material selection, dimensional precision, and component design allows rivets to repeatedly perform their vital function in critical products and assemblies. By choosing high quality rivets matched to the application, manufacturers can improve product performance, reduce assembly errors, and prevent field failures caused by inadequate fasteners. CNC Milling