Hello, this is Morio.

Until now, I have discussed bearings, shafts, and keys for our feed shafts. Today, I’d like to explain about “flanges.” A flange is a ring-shaped, collar-like component that is extremely important for securely fixing shafts to the frame or structure of machinery, ensuring stable power transmission and movement.

Roles of Flanges

1. Fixing and Positioning Shafts:

Flanges are used to fix shafts to the frame of machines. For example, in the case of our feed shafts, bearings are incorporated into the inner diameter of the flange and then fixed to the frame (the outer ring of the bearing is fixed, and the inside rotates). This ensures that the shaft is stably positioned at the correct location, preventing vibrations and misalignment during rotation.

2.Power Transmission:

When a shaft is fixed to the frame through a flange, the force generated during rotation is effectively transmitted to the drive section, maintaining the stability of the entire machine’s operations.

3.Reduction of Vibration and Noise:

Appropriately designed flanges absorb vibrations caused by shaft rotation and also reduce noise generation. This enhances the precision of the machinery and allows it to withstand long-term use.

Materials and Design of Flanges

1.Materials:

At our company, we typically use carbon steel, and in some places, cast iron. Generally, stainless steel, aluminum, and special alloys are also used. The selection of materials is based on the required strength, corrosion resistance, and the operational environment of the machine.

2.Design:

The design of flanges considers the diameter of the shaft, the characteristics of the frame to be attached, and the load conditions during operation. Flanges are often bolted to the frame, and the number, arrangement, and size of bolts are critical design elements. The use of gaskets or seals to enhance sealing is also considered.

Quality Points

1.Precision, Dimensions, and Central Position of the Inner Diameter:

The dimensional accuracy of flanges is extremely important, including the parts where bolts are used for attachment. Each part’s dimensional accuracy, including the precision of the central position of the inner diameter, directly affects the performance of the machine and can cause misalignment and vibrations if not precise. This requires careful attention during both parts manufacturing and assembly.
Since the shaft is fixed on both sides, the centers of the two flanges must align. Moreover, the parts of the frame where the shaft and flanges fit must also ensure the shaft and flanges are mounted straight and centered on both sides. Our company uses a box-type frame known for its excellent vibration resistance and durability, which makes post-processing hole accuracy and pitch adjustments challenging and demands high processing skills from our cooperating companies. During assembly, position adjustments are difficult and require high skill and ingenuity. “Manufacturing is not just about assembly, but about creating final quality,” and this scenario exemplifies that.

2.Durability and Strength:

Considering high loads and harsh conditions, flanges need to be designed with sufficient strength and durability, both as individual parts and when assembled. This involves not just material selection but also the shape. While the inner diameter is circular, the outer part may vary according to the mounting position and required attachment strength, using shapes like circles, squares, pentagons, or others as needed. Width, thickness, and the presence of steps are also designed considering necessary characteristics. While off-the-shelf products are available, our company designs our flanges with these features ourselves to enhance specific characteristics, relying on our cooperative companies for manufacturing.

#This blog is made by generative AI from original text.