A new modular drill bit design can effectively avoid the above problems. This drill uses a replaceable carbide tip that provides comparable cutting performance and tool life to high-efficiency solid carbide drills. There is no threaded connection between the drill tip and the steel shank or other connections that are difficult to handle on small diameter drill bits. Since the drill tip is designed without the need for regrind, the geometry of the drill tip can be optimized, and the rake face of the drill tip uses a positive rake angle to reduce cutting forces and improve self-centering capability. Since the alloy steel drill body has a lower rigidity than the solid carbide drill bit, it is important to compensate the bit rigidity by using the positive rake angle.
Unlike conventional carbide drills, the chip flutes of modular drills do not use the same helix angle from front to back. Instead, they use a right-handed helix at the front of the flute to accelerate chip flow, and at the rear of the flute. With a small negative helix angle, the negative helix angle is particularly useful for increasing the stability of the bit and reducing vibration. Also, it is important to compensate for the reduced rigidity of the steel body.
Another difference between a modular drill and a solid carbide drill is that the coolant outlet is located in the flute and directly aligned with the rake face of the cutting edge (the exit of the solid carbide drill cooling hole is On the side of the drill tip, the importance of this design is that the rake face of the cutting edge is usually the area with the highest processing temperature, and it is highly desirable to provide effective cooling between the chip and the tool material. This cooling hole is designed to optimize the cooling effect while also providing a thermal shock to the chips, helping to improve chip control. Since the chisel edge is not directly exposed to the impact of the coolant, it is also advantageous for the chip to be formed in the chisel region where the cutting speed is very low.
In addition to the consistent tool life, another important advantage of using a modular drill is the ability to significantly reduce tool inventory. When using conventional carbide drills, there is a large demand for drill stocks because a large number of drills are often in the regrind process. The use of disposable drills eliminates the need for regrind and reprocessing, and the tool inventory is equal to the number of drill bits machined (and perhaps a small number of spare parts on the tool holder).
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The utility model discloses a Kitchen Shower head that is convenient to switch the water outlet mode, has a compact structure, and is easy to use and a kitchen faucet using the kitchen shower head. The shower head includes a shower body and a shower head provided with a spray water outlet and a V-shaped water outlet. , The shower head is provided with a water separator, and the water separator is provided with an annular flow channel and an inner flow channel respectively connected to the spray water outlet body and the V-shaped water outlet body, and the lower end of the outer wall of the water separator is upwardly circular A plurality of water inlet holes connected to the annular flow channel are provided, and a first sealing ring is provided on the lower side of the water inlet hole; the water outlet end of the shower body is connected with a converter, and the converter is provided with a communicating In the water diversion cavity at the water outlet end of the shower body, the lower end of the water diversion device is installed in the water diversion cavity and can move up and down, and the upper end of the inner wall of the water diversion cavity is provided with a matching first sealing ring
Kitchen Pull Shower,Kitchen Pull Shower Head,Stainless Steel Shower Head,Rotating Wash Basin Shower
Yuyao Zelin Sanitary Ware Co., Ltd , https://www.kitchen-sinkfaucets.com