Understanding the Various Types of Fasteners in CNC Machining(compressive strength of steel Jessica)
- source:JUSTYN CNC Machining
In modern manufacturing processes like Computer Numerical Control (CNC) machining, a wide range of fasteners plays an essential role in assembling and securing various components. These small yet vital mechanical devices ensure structural integrity, allowing for the successful completion of complex projects. This article will explore some common types of fasteners used in CNC machining, highlighting their individual applications and production techniques.
Types of Fasteners:
Screws are ubiquitous fastening devices composed of a threaded body and a head that requires rotational force to penetrate into materials. They come in various shapes, including flathead, roundhead, pan head, and countersunk screws. Produced primarily through thread rolling or machining processes, screws find extensive use in joining parts together, creating secure connections, and enabling easy disassembly if needed.
Similar to screws, bolts also consist of threading along their length, but they typically lack a tapered end. Bolts require the presence of a nut on their exposed threads to hold together multiple components tightly. Bolting involves pre-drilling holes before inserting the bolt and affixing it with a nut. The advantage of bolts lies in their ability to produce more durable connections capable of sustaining higher loads without loosening over time.
Nuts are internally threaded fasteners designed to mate with bolts or threaded studs. By utilizing torque applied to the nut, two or more components can be clamped securely together. There are different types of nuts available, such as hex nuts, lock nuts, wing nuts, and T-nuts. Hex nuts, created using CNC machines or hot forging processes, are among the most common and versatile options found in many applications.
Washers are thin, flat metal or plastic pieces placed beneath the head of a bolt or nut to distribute load forces evenly. They protect surfaces from damage, reduce the risk of loosening due to vibrations, and aid in maintaining proper tension on fastened joints. CNC machining ensures precision in producing washers with accurate dimensions that conform to specific requirements.
Unlike screws or bolts, rivets are non-threaded fasteners used to permanently join materials together. They consist of a cylindrical body, called a shank, which gets inserted through pre-drilled holes. The exposed end of the shank is then "upset" by deforming it, creating a mechanical bond that holds the materials firmly in place. Aluminum and stainless steel are common materials for rivets, and their production involves specialized machinery like turret punch presses.
Clips serve as efficient joining solutions for securing panels, covers, or wires in CNC machining applications. These often spring-loaded fasteners provide quick-release capabilities, simplifying installation and maintenance processes. Clips can be fabricated using various manufacturing techniques, such as stamping or wire forming, depending on the required design complexity and material properties.
CNC machining plays a significant role in the fabrication of many fasteners mentioned above. The process involves computer-controlled cutting, drilling, turning, and milling operations to create intricate shapes and precise thread profiles. Some commonly used techniques include:
1. Thread Rolling:
Thread rolling uses hardened threading dies to press against a rotating workpiece, causing plastic deformation along its surface and generating threads. This method ensures accurate thread creation while enhancing the strength and durability of the metal's external profile.
Machined fasteners involve using CNC lathes, mills, or other cutting tools to remove unwanted material and form threaded features. It allows for customization based on specific requirements while achieving excellent dimensional accuracy and seamless finishes.
3. Cold Heading:
Cold heading, also known as cold forging, produces fastener heads through high-speed compression molding. By subjecting metal blanks to tremendous force, the material flows into various die cavities, shaping it into desired configurations. Cold heading offers rapid production rates, cost-effectiveness, and improved material strength.
Understanding the different types of fasteners used in CNC machining is crucial for ensuring the performance, durability, and safety of assembled components. From screws and bolts to nuts and rivets, each fastener contributes to establishing reliable connections in manufacturing processes. With advanced production techniques like thread rolling, machining, and cold heading, precise and consistent fastener production can be achieved, supporting efficient assembly and secure integration across a wide range of industries. CNC Milling CNC Machining