Development and application of the hottest blade c

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Development and application of blade cutters

face milling cutter

the structure of face milling cutter can be divided into flat mounting and vertical mounting according to the installation mode of blade. Paperback was earlier adopted by Walter of Germany, while vertical packaging was launched by Ingersoll of Germany. The flat mounting method has the characteristics of large front angle of blade installation and large chip holding groove. The vertical mounting method has the characteristics of blade compression resistance and impact resistance, which is suitable for heavy cutting. 1 Mass of main impact hammer: 150kg (or 100kg). Through cooperation with Harbin Institute of technology, Harbin Gongliang tool factory and Mianyang tool factory, we have developed a flat blade structural surface milling cutter for processing stainless steel blades

(1) blade clamping mode

blade clamping methods include front and rear pressing block, wedge adjustable, eccentric, lever, screw compression and elastic clamping. The basic requirements are convenient clamping, firm clamping and precise positioning. The extensometer manufactured with this structure can measure very small deformation with high precision, simple structure and easy chip removal. The blade face milling cutter adopts the pressing block clamping mode, which not only has a large chip holding groove, but also has low requirements for the accuracy of the blade and strong versatility

(2) selection of geometric angle of milling cutter

According to the rake angle, face milling cutters can be divided into double negative rake angle, double positive rake angle and positive and negative rake angle. "With the continuous accumulation and development of Ningbo new material industry, face milling cutters. During the "Seventh Five Year Plan" period, domestic heavy-duty machining industry and tool manufacturers began to study heavy-duty cutting tools and developed double negative rake face milling cutters with negative axial and radial rake angles. It has been proved that the manufacturing of power station equipment is different from the heavy processing of castings and forgings by heavy machinery manufacturers, and the application of "heavy cutting face milling cutter" in the processing of large assembly and welding components and parts is a misunderstanding. The double negative rake face milling cutter is easy to produce cutting vibration, which makes the machined surface roughness poor and the cutter easy to collapse. Selecting the axial and radial rake angles as positive values and increasing the rake angle can reduce the cutting force and vibration and meet the requirements of high-precision and high-speed cutting. Through the test, the radial front angle is optimized γ F=0 °~ 2 °, axial forward angle γ p=9°~12°。

the main deflection angle of face milling cutter is 45 ° ~ 90 °. Different principal deflection angles affect the cutting force direction and the actual cutting depth. In addition, the main deflection angle of face milling cutter is different, and the polishing edge grinded by its blade is also different. In production, the operator does not understand or pay attention to the difference of polishing edge of different main deflection angle blades, which can be said to be in a mixed state. The main deflection angle of 75 ° is optimized and extended to the whole plant when processing other parts, which reduces the loss caused by the unreasonable use of the blade

selecting a small value of the back angle can increase the strength of the cutter teeth, but the blade material is tough. In order to reduce the friction between the back surface and the machined surface, the back angle should be larger, and the back angle should be taken α= 7°~9°。 The back angle of the face milling cutter is formed by the installation back angle of the cutter body design and the back angle of the blade. The back angle series of the blade has 0 ° ~ 25 °. Considering the strength of the blade and the limitation of the installation angle, the back angle of the blade is selected α= 11°。

(3) milling cutter pitch distribution

choosing unequal pitch distribution has a good effect on reducing cutting vibration

special face milling cutter

the machining area of blade surface is large, the machining allowance of casting surface is 0 ~ 70mm, and the program runs empty during rough milling. Purchased from waldlich, Germany The gantry milling machine of Kebao company is equipped with the NC milling head with the largest power in the world at present, which provides the working conditions for the selection of airborne system suppliers to realize large cutting depth and large feed at the same time. In cooperation with Harbin Institute of technology and Mianyang tool factory, we have developed a special face milling cutter with double-layer blade stepped tooth structure, and the allowable cutting depth is 20mm

spiral end mills

blade inlet and outlet, water edge and welding groove φ 80、 φ 63 spiral end mills. The price of foreign cutters is about 17000 ~ 27000 yuan/piece, while the price of domestic spiral end mills is about 1/4 ~ 1/8. We have cooperated with Taiyuan wangpai tool factory to develop a spiral end milling cutter suitable for machining stainless steel blades. The cutter is a flat blade screw clamping structure. Deepen the chip holding groove and increase the spiral angle, which is conducive to chip removal and light cutting; The end of the milling cutter is the part that participates in cutting the most and is also the most vulnerable to damage. The structure of replaceable head greatly prolongs the service life of the cutter body; Improve the replaceable head design, increase the chip holding space and auxiliary rear angle at the bottom edge, and avoid the common phenomenon of blocking chip accumulation and cutting; The end edge is changed from 2 edges to 4 edges, which greatly improves the most vulnerable condition of this part; The square blade is used for the peripheral blade, which increases from 2 times to 4 times, improving the utilization rate of the blade

ball end milling cutter

ball end milling cutter is used to process the flange root surface of axial-flow turbine blade. The cutting speed at the center of the tool ball head tends to zero, the cutting condition is bad, and it is easy to produce chip blockage and tool tooth collapse. It is difficult to localize ball end milling cutters, so Hitachi cutters are now used

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