Headquartered in Walter for the whole world at the auto manufacturers and suppliers to provide the tools used in the manufacturing process more efficient and solutions. The drilling of oil holes is carried out with the new chip removing drill bit, the chip removal effect is good, the tool life is long, the processing stability is high, and the environmental protection and cost saving trace oil mist lubrication (MQL) are supported.

The crankshaft bore the drill itself into challenge. One of the key adjustments is the depth of drilling and its consequences. Drilling depth is usually 20 times the diameter or above. A drill hole of 6 millimeters in diameter is usually used in passenger car crankshafts, with drilled depths of up to 120 mm or even 150 mm. In extreme cases, the depth of the oil hole is up to 30 times.

The workpiece may be made of cast alloy or steel depending on the manufacture and the type of car. Usually, the tensile strength is 800 ~ 1200 nm (Nm). About 80% of the oil hole diameter of the passenger car is 4~8 millimeters, and the commercial vehicle crankshaft oil hole diameter is 5~6 millimeters. The standard is 7~8 millimeters.

Challenge: deep drilling, chip removal

Especially for steel crankshafts, such as those of commercial vehicles, the drilling depth is most prone to problems: smooth and clean chip discharge. If the drill punched the workpiece, it usually formed a very long spiral chip. If the drilling depth is 5 times the aperture, then it is difficult to chip out.

Walter, business development and component transportation manager, Harald
"We have to solve these problems when we start developing new bits of chip drilling," PreuBer said. We have changed the core groove drill point, by this way, not long crumbs, now is the formation of drilling debris comma shape. Because of the short not stuck in between the clastic drilling and cutting tool, so the chip more easily." After the new groove is adopted, the residual drill chip formed when the tool tip is too small in size is no longer a problem.

Some new improvements have been made by the new groove developed by Walter engineers. With most of today's processing concepts and tools, the process of drilling deep holes must be interrupted before they can be removed. "With our new cutter, we can drill holes that are very deep and continue to the bottom, because there is no plug in the hole, and it is much more efficient than before."."

When cast iron is used, the unique small plane makes the minimum amount of wear

The processing conditions of cast iron workpieces are different. Generally speaking, cast iron is easier to process than steel. But, in particular, gray iron makes the tool wear faster in the corner. To prevent this, Walter researchers devised a new oil drill, used for cast iron drilling, to form a unique small plane.

Harald

PreuBer is particularly proud of the products developed to make micro oil mist lubrication (MQL) more efficient. Micro oil mist lubrication refers to less than 20 milliliters of cooling lubricant consumed per hour during processing.

Without the wet processing of traditional emulsion or cooling oil, the new product adopts oil air cooling and lubrication of the cutting tool and the surface of the workpiece. Waste heat is removed by tools and cuttings. In addition to coolant distribution and supply reliability, safety chip removal is also important for micro oil mist lubrication. PreuBer said happily: "our new groove has a distinct chip advantage."."