Fasteners play a crucial role in several industries, including CNC machining. These small yet vital components hold together various parts, enabling smooth functioning and structural integrity of machines. In this article, we delve into the world of fasteners used in CNC machining, exploring their types, production methods, and use cases.
Types of Fasteners in CNC Machining:
Screws are undoubtedly the most commonly used fasteners in CNC machining. They have threaded shafts that can be effortlessly tightened or loosened using a screwdriver or other suitable tools. The head designs differ, offering flexibility for specific applications such as flat-head screws for flush mounting or pan-head screws for added strength.
Similar to screws, bolts also possess threaded shafts but lack heads. Instead, they require nuts for proper fastening. Available in a variety of sizes, shapes, and materials, bolts provide durable connections within CNC machined assemblies.
Nuts complement bolts by providing the means to secure them tightly. Hex nuts are widely used due to their ease of gripping with standard wrenches or socket sets. Nylon-insert lock nuts prevent unwanted loosening caused by vibration, ensuring enhanced safety.
Washers act as both protective and load-distributing elements. They are placed between the fastener and the component being secured, preventing damage due to over-tightening and providing stability. Split washers or spring washers help maintain tension even under dynamic conditions.
Rivets are permanent fasteners ideal for joining thin sheets, plates, or metals that would otherwise deform when drilled. They consist of cylindrical shafts inserted through pre-drilled holes. Once set, rivets permanently hold the joined pieces together, making them resistant to vibration and thermal expansion.
Pins are versatile fasteners widely used in CNC machining for alignment and retention purposes. Dowel pins, taper pins, or spring-loaded pins ensure precision in locating components, while retaining pins securely hold objects together.
7. Clips and Clamps:
Clips and clamps provide temporary or semi-permanent fastening solutions in CNC machining applications. Spring clips, hose clamps, and C-clamps efficiently hold cables, hoses, or other flexible materials in place without damaging them.
Production Methods of Fasteners:
Fasteners may be produced using various manufacturing techniques, including:
Most high-precision fasteners are machined from metal rods or bars using lathes or milling machines. This method ensures dimensional accuracy and excellent surface finish.
2. Cold Forming:
Cold forming, also known as cold heading, involves the shaping of metals at room temperature by applying pressure instead of heat. This cost-effective process is popularly used to manufacture screws, bolts, and nails.
For large or irregularly shaped fasteners, casting processes such as investment casting or die-casting are employed. Molten metal is poured into molds with precise dimensions to form intricate fastener shapes.
4. Injection Molding:
Injection molding works well for producing plastic fasteners. It involves injecting molten plastic into molds under pressure, resulting in accurate shape replication and quick production rates.
In the realm of CNC machining, choosing the appropriate fasteners is key to ensuring reliable performance, longevity, and safety in assembled components or structures. By considering factors such as material compatibility, loads, and environmental conditions, manufacturers can select the right types of fasteners to achieve robust connections. Understanding different production methods for fasteners enables businesses to make informed decisions about sourcing these essential components for CNC machining operations. CNC Milling