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KYOCERA Announces New Dynamic Bar SDUC Boring Tool

New design concept dramatically improves chip discharge performance, enhances productivity

March 16, 2009
Kyocera Corporation (President: Makoto Kawamura) announced that its Cutting Tool Division has developed the Dynamic Bar SDUC, a new boring bar for cylinder bore machining. The product launches on March 21.

With the combination of a new chip pocket design, which optimizes chip evacuation, and a new coolant structure concept, the product significantly improves the chip evacuation ratio and dynamically enhances productivity.

The market release of this product expands the lineup of Kyocera's Dynamic Bar Series for cylinder bore machining, which originally launched on November 21, 2008. The new product is intended to increase customer satisfaction in this market segment.

Photo: Dynamic Bar SDUC
Dynamic Bar SDUC

Product name Dynamic Bar SDUC
Variety 32 types
Purpose Contour machining
Production base Yohkaichi Plant, Shiga Prefecture, Japan


Superior chip evacuation
Typically, the process of boring (machining the inside bore of cylindrical material) is problematic due to the irregular evacuation of machined chips - causing interruptions to the process, chipping of the tool, or scratches on the machined surface. Therefore, improved chip evacuation performance is crucial to ensure greater productivity when machining bores.

The new chip pocket structure and liquid coolant feature enable the Dynamic Bar SDUC to significantly improve the chip evacuation ratio. While Kyocera's conventional boring bar has a chip evacuation ratio below 10 percent, this new product improves that ratio to 95 percent or higher.*
*Based on in-house tests

1. New chip pocket structure design
The design of the new Dynamic Bar SDUC significantly enhances chip evacuation by utilizing the gap formed between the blade tip and holder (Dimension S) as the space for chip evacuation.
2. New coolant structure concept
Conventional internal coolant supply boring bars incorporate a structure through which coolant flows onto the blade tip from the coolant hole in order to cool the friction heat generated on the blade tip while machining.

The design of the New Dynamic Bar (model no. 16) repositions the coolant hole, allowing coolant to be ejected outward to the inner surface of the work piece - a design which also enhances chip evacuation. This new concept of utilizing coolant as a liquid flow to enhance chip evacuation has further improved the product's chip evacuation ratio.

Image: The streamlined chip pocket causes chips to flow rearward. Chip pocket on the side evacuates chips into the inlet side of inside bore.
Image: The coolant hole near the inner surface of the work piece creates a flow in the direction of chip evacuation.

* Coolant refers to the liquid used to cool the heat generated by friction between the chip blade and work piece while machining. There are two ways to use coolant: an internal supply-type, in which the coolant hole is placed inside the holder for discharging the coolant, and an external supply-type, in which the coolant is brought into contact with the blade tip using a structure other than the holder.