Another important factor that affects the "quality of the cut surface" and "tool life" in aluminum cutting operations is the "feed rate."
In cutting machines equipped with automatic feeding devices, it is essential to accurately understand and appropriately set the feed amount (Feed) and the feed per tooth (fz). ▶️ What is feed speed (Vf)? It is a value that indicates how fast the material is fed in relation to the rotation of the blade. ✅ The unit is usually mm/min (millimeters per minute). ✅ Even with manual operation, it unconsciously affects the actual working speed. ▶️ What is feed per tooth (fz)? fz is a value that represents the thickness cut by a single blade. ✅ Calculation formula for fz (Note: For alternating blade types, two blades are considered as one blade) fz (mm/tooth) = Vf (mm/min) ÷ (Z ÷ 2 × N) - Vf: Feed speed (mm/min) - Z: Number of blades (for triple chip, Z ÷ 2) - N: Rotational speed (rpm) ▶️ Recommended fz guidelines by material Material | Recommended fz | Notes Pure aluminum/soft materials | 0.02–0.10 | Focus on sharpness. Slightly faster feed is acceptable. General aluminum alloys | 0.02–0.07 | Focus on balance. Good finishing as well. Thick plates/hard materials | 0.02–0.05 | Feed should be cautious to prevent friction and welding.
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Practical Example: Back-calculation of Feed Speed ▶️ Example: Rotational speed 3000rpm, number of blades 100, fz = 0.06 mm/blade Vf = 0.06 × (100÷2) × 3000 = 9,000 mm/min (9m/min) → For triple blades, since 2 blades perform one cutting operation, it is calculated as half of the usual amount. ▶️ In the case of manual feeding Even with the same rotational speed and number of blades, if calculated with fz = 0.02: Vf = 0.02 × (100÷2) × 3000 = 3000 mm/min (3m/min) → This is within a range that can be controlled manually. ▶️ Points for Proper Feed Settings ✅ The basic principle is to "push through without stopping at a constant speed." ✅ Stopping or slowing down midway can cause heat to concentrate on the cutting edge, leading to welding or chipping of the blade. ▶️ Recommendations: ✅ In automatic feeding mechanisms, use servo control or inverter control for deceleration and stop control. ✅ During manual feeding, maintain a stable posture and force, and be aware of the amount of cut per tooth.
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▶️Technical support from Okumura Machinery Manufacturing Our cutting machine (URKM series) allows for numerical setting of feed speed. Additionally, during the initial setup support (OKUMURA SELECT), we provide guidance on the optimal combination of feed speed and peripheral speed.
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The feed rate per blade fz refers to the value that represents the thickness cut by a single blade. Appropriate fz guidelines by material: | Pure aluminum / Soft materials | 0.02–0.10 | Focus on sharpness. A slightly faster feed is acceptable. | | General aluminum alloys | 0.02–0.07 | Focus on balance. Good finishing as well. | | Thick plates / Hard materials | 0.02–0.05 | Feed should be cautious to prevent friction and welding. |
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When cutting thick plates, what happens if the rotation speed is not correct?" "If the rotation speed is not right, it negatively affects the performance of the cutting tool. In particular, if the rotation speed of the tool is high but the feed rate is slow, the cutting edge can become too hot. When heat builds up, chips can weld to the cutting edge, making the cutting process less smooth." "That would be a problem..." "Yes, it is important to match the correct rotation speed and feed rate. By the way, there are related videos where you can see cutting scenes with optimally adjusted rotation speeds and feed rates, so you can refer to how the work progresses in practice.
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Okumura Machinery Manufacturing Co., Ltd. was founded in Takamatsu City in 1952. We began manufacturing woodworking machines in 1965 and consistently focused on aluminum profile cutting in the 1970s, achieving success in this area. By focusing on the goal of ensuring and improving our customers' productivity, we became a market leader in aluminum cutting machine manufacturing. With a product range of over 100 items, we can meet various customer needs. Additionally, our semi-custom machine designs allow us to provide products tailored to various fields and company sizes. Our domestic product range, which exceeds 6,000 units, speaks to our capabilities. However, what we take particular pride in is that we have remained a grounded company that embodies the values of small and medium-sized enterprises, such as quality, flexibility, individuality, reliability, and closeness to our customers. One indicator of the superior quality of our products is their longevity, with many of our products being used for over 30 years. Our goal is to develop perfect products for our customers. We look forward to being your partner in providing products and services that understand and meet your needs at Okumura Machinery Manufacturing Co., Ltd.