In order to let more people know about polishing and grinding, Honway update the knowledge column from time to time.
Dressing a grinding wheel refers to using a dressing tool to shape the wheel or remove the dulled surface layer, thereby restoring the grinding performance and correct geometric shape of the working surface. Timely and proper wheel dressing, along with the correct use of a diamond dressing tool, is essential for improving grinding efficiency and ensuring quality.
In the global pursuit of eco-friendly alternative materials, researchers from the Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta” at Politecnico di Milano, in collaboration with Aalto University in Finland, VTT Technical Research Centre of Finland, and the CNR SCITEC Research Institute, have successfully developed a sustainable hydrophobic paper combining high strength and waterproof properties. This groundbreaking research offers a biodegradable alternative to conventional petroleum-based materials and presents potential applications in packaging and biomedical devices.
Different abrasives offer distinct advantages based on their characteristics and applications. Aluminum oxide abrasives (A, WA), known for their toughness and stability, are suitable for machining materials with high tensile strength, such as mild steel and stainless steel. Silicon carbide abrasives (C, GC), with their high brittleness, excel in processing hard and brittle materials like cast iron and ceramics, especially in operations involving large contact areas. Zirconia abrasives, due to their high toughness, perform exceptionally well under heavy grinding loads, making them ideal for tough austenitic stainless steels. Superabrasives (diamond and CBN), with their extreme hardness, are the optimal choice for machining ultra-hard alloys, ceramics, and difficult-to-machine materials. Choosing the right abrasive not only enhances grinding efficiency but also reduces processing costs and meets diverse machining requirements.
The selection of a grinding wheel’s bond strength is a critical aspect of grinding operations. It must be based on grinding theory while considering multiple factors, including the physical properties of the workpiece, the relative speed of the grinding wheel and workpiece, the size of the contact area, the grinding method, and the stability of the mechanical equipment.
Soft workpieces are best suited for hard grinding wheels, while hard workpieces require soft grinding wheels. For high-speed operations, softer bond strengths are preferable, whereas low-speed operations favor harder bond strengths. Workpieces with large contact areas require soft grinding wheels, while those with small contact areas are better suited to hard grinding wheels. Manual grinding and equipment with high vibration call for hard grinding wheels, while stable mechanical grinding is better suited to soft grinding wheels.
Selecting the appropriate bond strength not only enhances grinding efficiency and processing quality but also extends the life of the grinding wheel and reduces costs, providing a foundation for efficient and cost-effective machining.
Appropriate foaming can significantly improve the polishing process, resulting in better surface finish and shorter processing time. However, excessive foaming or a lack of foam can lead to longer processing time or poor polishing results. This article outlines the potential causes of foaming issues, explains their impacts, and provides solutions to improve processing efficiency and workpiece quality.
The lifespan of a grinding wheel is closely related to its wear. As long as no “abnormal conditions” occur, a grinding wheel can generally be deemed usable and continue its operation.
This article introduces several key aspects of grinding wheel wear, methods for calculation, and ways to address wear issues. If you’re interested, follow along for more insights.
In grinding operations, the lifespan of the grinding wheel significantly affects both machining efficiency and quality. The usable life of a grinding wheel is influenced by multiple factors, including: Bonding strength, workpiece speed, wheel rotational speed, depth of abrasive penetration. Different grinding conditions can alter the rate of wheel wear. This explains why a grinding wheel may perform well under one set of conditions (Method A) but poorly under another (Method B). Understanding how to calculate the grinding ratio and specific wear rate can help in selecting the right grinding wheel, which is crucial for improving production efficiency and reducing costs.
The grinding wheel is an indispensable tool in grinding processes, and its performance directly impacts machining efficiency and the surface quality of workpieces. During grinding, the cutting edges of a grinding wheel exhibit an irregular distribution at the microscopic level, undergoing complex changes such as wear, dislodgment, and self-sharpening under high-temperature and high-pressure conditions. These …
This chapter discusses key issues in grinding processing, including machining surface accuracy, smoothness, and surface stability. Due to thermal load and mechanical stress, problems such as deterioration, residual stress, and poor surface roughness often occur, which in turn affect the performance and lifespan of the workpiece. Corresponding solutions are proposed to improve processing quality.
Grinding processing is a precision surface treatment technology, where controlling the surface roughness of the workpiece is crucial for quality. Surface roughness affects appearance and functionality, such as wear-resistance. The article discusses the definition of surface roughness, influencing factors, and improvement methods, emphasizing the importance of selecting suitable grinding wheels and controlling various parameters to enhance processing quality.
Grinding heat is an important phenomenon caused by high-speed friction between the abrasive grain and the workpiece during the grinding process, which will affect the workpiece and the grinding wheel. Controlling the generation and transfer of grinding heat, utilizing the appropriate coolant and adjusting process parameters can help to improve the surface quality and process stability of the workpiece.
