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Illinois, product manager at Ingersoll Cutting Tools in Rockford, Ill., pointed out an important and interesting conclusion. They say that cutting tool users are considering milling cutters and boring tools, which use carbide only in the tip end. These tools offer an economical compromise between high speed steel knives and solid carbide tools.
These toolable tool tips are not “plug-in†tools. Instead, the tool changes the principle of a plug-in carbide tool into a small-diameter tool that is often not a candidate for a replaceable blade. The fully replaceable tip is either screwed in or firmly attached to the steel knife and the steel blade acts as a toolholder and is therefore unaffected by the service life of the carbide tool. The above figure shows two examples of such a tool: a "QwikTwist" drill with a replaceable tip and a "ChipSurfer" modular milling system.
These tools save costs. The change in the price of cemented carbide shifts the focus of the discussion to the prepaid purchase price of the tool, which is contrary to more hidden costs. However, the fact that implicit costs affect the choice of tools is still completely true.
For example, a replaceable tip can be swapped out on the machine while the holder remains in place. Due to the accuracy and repeatability of the tool tip in place (represented by the company as low as ±0.0005 inches in the axial and radial directions, ie ±0.0127 mm), it is not necessary to re-measure the offset of the tool, which saves time.
Another savings is related to inventory. When the carbide tool is reground, the shop must have enough tools to ensure that a certain number of tools are retained in the regrind buffer (sometimes referred to as the tool "reserve"). If the shop needs to have two of the same specific carbide drills available, then it needs to have six such tools to solve the problem of regrind lag. Using a tool with a replaceable tip eliminates this inventory and, more importantly, avoids the cost and effort of tracking these tools.
Carbide price rises cause concern for replaceable tips
This year, the price of tungsten has risen sharply. In order to meet the domestic consumption of tungsten metal, China has recently taken some measures to reduce the export of tungsten. This move has had a certain impact on the price of tungsten. A news agency involved in the metals and mining industry estimates that China controls 75% of the world's tungsten reserves and supplies 85% of its tungsten consumption. The most affected are cemented carbide products such as cutting tools, which account for more than half of all tungsten demand. As tungsten prices rise, cutting tool suppliers feel price pressures.