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Views: 100 Author: Site Editor Publish Time: 2025-02-01 Origin: Site
In the field of mechanical engineering, connection is the basis for building complex mechanical systems. Threads, bolts and nuts are the most commonly used fasteners, and their role cannot be ignored. These components not only ensure the stable connection between parts, but also provide great convenience for assembly and disassembly.
Thread is a spiral line structure with continuous protrusions and depressions formed on the surface of a cylinder or cone. It is used to realize the conversion of rotational motion to linear motion, or as a means of connection, it fixes parts by interlocking with matching threads.
Threads are divided into external threads and internal threads:
- External threads: formed on the surface of rod-shaped objects, such as bolts.
- Internal threads: exist inside holes, such as nuts or pipe ends.
- Diameter: including major diameter (maximum diameter), minor diameter (minimum diameter) and median diameter (average diameter).
- Pitch: the distance between two adjacent teeth along the axial direction.
- Lead: the distance a complete thread circle advances along the axis.
- Number of heads: refers to the number of spiral lines on the thread.
- Accuracy level: different accuracy levels defined according to national standards.
Thread processing refers to the process of making threads of the required specifications on the workpiece. This can be done by a variety of methods, such as turning, milling, rolling, etc. Each method has its own characteristics and is suitable for different application scenarios.
CNC external thread grinding machine is a high-precision device specially used for precision processing of external threads on materials with higher hardness. When working, the grinding wheel rotates and feeds according to the pre-programmed path, and the workpiece also rotates at a certain speed, and the two cooperate to complete the grinding of the thread.
1. Preparation stage: set the parameters of the external thread grinding machine and select the appropriate grinding wheel and coolant.
2. Rough grinding: preliminary removal of excess metal and close to the final size.
3. Fine grinding: adjust the position of the grinding wheel to ensure the required dimensional accuracy and surface finish.
4. Inspection and correction: use measuring tools to check the quality of the thread and adjust it as needed.
- Automated control: Use computer-aided design/manufacturing (CAD/CAM) software to accurately control the machining process.
- Stable machining environment: Reduce the influence of vibration and other external factors.
- High-quality tool materials: Use grinding wheel materials with good wear resistance and heat resistance.
Application workpieces of external thread grinding machines
External thread grinding machine workpieces are widely used in various mechanical parts, such as:
- Bolts: One of the most common fasteners, used to firmly connect two or more parts together.
- Screw: Used to transmit power and play a transmission role in mechanical equipment.
- Valve stem: A valve component that controls fluid flow.
- Pipe joints: Connect pipes in different sections to ensure the sealing and stability of the system.
Due to its excellent performance, external threads can appear in almost all places involving mechanical connections, including but not limited to the automotive industry, construction industry, aerospace, medical equipment, etc. It can be found in both static structures and dynamic machines.
Take our company's CNC external thread grinding machine as an example, working accuracy
Working accuracy
Item | 7140 |
adjacent pitch | 0.0025mm |
in 25mm long | 0.004mm |
in 100mm long | 0.005mm |
in 300mm long | 0.008mm |
In whole length | 0.011mm |
Half angle error | ±8 |
Thread roughness | Ra0.2μm |
Thread processing technology is also constantly improving, from traditional manual operation to today's highly automated CNC processing, allowing us to produce more precise and durable products. In the future, with the introduction of new materials and technologies, I believe this field will continue to develop.
