Key Takeaways & Executive Findings
- •• Dry electrical discharge assisted grinding (DEDAG) significantly improves surface quality of SiCp/Al composites, achieving a 19.2% average reduction in surface roughness compared to conventional grinding. • DEDAG reduces axial, tangential, and normal grinding forces by approximately 10.5%, 37.8%, and 23.0%, respectively, indicating lower mechanical loads and reduced tool wear. • The proposed method produces smaller chip sizes and lower grinding temperatures, contributing to less thermal damage and improved machinability of the composite. • Optimized process parameters (N=2500 r/min, vf=30 mm/min, a=10 µm, E=15 V, f=5000 Hz, dc=80%) yield a surface roughness of 0.161 μm, demonstrating the potential for high-precision machining.
Abstract
SiC-reinforced aluminum matrix (SiCp/Al) composite is widely utilized in the aerospace, automotive, and electronics industries due to the combination of ceramic hardness and metal toughness. However, the significant disparity in properties between SiC particles and the aluminum matrix results in severe tool wear and diminished surface quality during conventional machining. This study proposes an environmentally friendly and clean dry electrical discharge assisted grinding process as an efficient and low-damage machining method for SiCp/Al. An experimental platform was set up to study the impact of grinding and discharge process parameters on surface quality. The study compared the chip formation mechanism and surface quality between dry electrical discharge assisted grinding and conventional grinding, revealing relationships between surface roughness, grinding force, grinding temperature, and related parameters. The results indicate that the proposed grinding method leads to smaller chip sizes, lower grinding forces and temperatures, and an average reduction of 19.2% in surface roughness compared to conventional grinding. The axial, tangential, and normal grinding forces were reduced by roughly 10.5%, 37.8%, and 23.0%, respectively. The optimized process parameters were determined to be N = 2500 r/min, vf = 30 mm/min, a = 10 µm, E = 15 V, f = 5000 Hz, dc = 80%, resulting in a surface roughness of 0.161 μm.
1. Introduction
SiC-reinforced aluminum matrix (SiCp/Al) is a metal composite matrix material composed of aluminum metal and silicon carbide particles. The material not only has the characteristics of high hardness and good chemical stability similar to SiC, but also has the toughness and electrical conductivity like metal materials [1–3], so it is widely used in aerospace, automotive and electronic fields [4–6]. It has unique applications in the pelvic fins of combat aircraft, fan outlet guide vanes of engines, and construction materials in spacecraft. It can also be utilized in automotive pistons and brake discs [7–9]. However, the properties of SiC and Al are very different, which makes it easy to cause serious surface and subsurface damage in traditional machining [10–12], which significantly deteriorates the mechanical properties and fatigue characteristics of the machined materials [13]. In addition, the stress distribution inside, around, and at the matrix is uneven. Therefore, during the cutting process, the matrix undergoes plastic deformation while the particles experience elastic deformation, rotation, brittle fracture, and detachment. In addition, it also leads to serious tool wear during mechanical machining [14], making it difficult to ensure machining quality. Therefore, an efficient and low-damage machining method for SiCp/Al composites is urgently needed.
Currently, precision machining methods for SiCp/Al composite mainly include laser machining, electrical discharge machining (EDM), ultrasonic machining, milling and grinding, etc. For example, Kong et al. [15] used Laser Assisted Machining (LAM) to process high volume fraction SiCp/Al composite, resulting in a higher material removal rate (MRR) compared to conventional machining while maintaining the same surface roughness. In addition, when compared to conventional machining, LAM offers several advantages such as a shorter machining time (less than 45%), a higher material removal rate, and an extended tool life. However, laser machining may cause defects, such as thermal deformation and cracking, in the material, which can negatively impact the surface quality. Seo et al. [16] used EDM for SiCp/Al composite with volume fractions ranging from 15% to 30%. As shown in the investigation, it was found that the material removal rate increased with the rise of peak current and on time. And it decreased sharply upon reaching the optimum value. However, EDM can cause thermal stress and surface ablation. Additionally, there is a significant amount of electrode wear in the machining process. Zha et al.
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Yanjun Lu, Yuming Huang, Xiaobu Liu, Rong Cheng, Shunda Zhan (2025). Study on Dry Electrical Discharge Assisted Grinding of SiCp/Al Composite. Chinese Journal of Mechanical Engineering. https://doi.org/10.1186/s10033-025-01185-y
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Frequently Asked Questions
What is dry electrical discharge assisted grinding (DEDAG)?
DEDAG is an environmentally friendly and clean machining process that combines conventional grinding with electrical discharge assistance. It is specifically proposed for difficult-to-machine materials like SiCp/Al composites, aiming to improve surface quality and reduce tool wear compared to conventional methods.
How does DEDAG improve surface quality of SiCp/Al composites?
DEDAG reduces surface roughness by an average of 19.2% compared to conventional grinding. This is achieved through smaller chip sizes, lower grinding forces, and reduced grinding temperatures, which minimize surface and subsurface damage.
What are the optimized process parameters for DEDAG of SiCp/Al?
The optimized parameters are: spindle speed (N) = 2500 r/min, feed rate (vf) = 30 mm/min, grinding depth (a) = 10 µm, discharge voltage (E) = 15 V, pulse frequency (f) = 5000 Hz, and duty cycle (dc) = 80%. These yield a surface roughness of 0.161 μm.
What are the main advantages of DEDAG over conventional grinding?
DEDAG offers several advantages: lower grinding forces (axial, tangential, and normal reduced by 10.5%, 37.8%, and 23.0% respectively), reduced grinding temperatures, smaller chip sizes, and improved surface finish. It also provides an environmentally friendly alternative as it is a dry process.
Why is machining SiCp/Al composite challenging?
SiCp/Al composite consists of hard SiC particles embedded in a softer aluminum matrix. The significant difference in properties leads to severe tool wear, surface and subsurface damage, and uneven stress distribution during conventional machining, making it difficult to achieve high quality and efficiency.
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