Pulley-groove finish-milling compound milling cutter
A fine milling and milling cutter technology, which is applied in the direction of milling cutters, milling machine equipment, milling machine equipment details, etc., can solve the problem that there is no technological reserve for fir tree wheel groove processing technology at the end stage of a 1000MW steam turbine, so as to improve cutting speed and increase production Efficiency, cost reduction effects
Active Publication Date: 2012-01-04
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
There is no suitable large-size fir-tree-shaped wheel groove milling cutter in China, and there is no technical reserve for processing fir-tree-shaped wheel grooves at the last stage of a 1000MW steam turbine
Method used
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Embodiment Construction
[0015] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.
[0016] Such as figure 1 with figure 2 As shown, this embodiment includes: a shank 1, a cutting part 2 and a chip removal groove 3, wherein: the top end of the shank 1 is provided with a cutting part 2, the chip removal groove 3 is connected to the shank, and there are 4 cutting parts 2 in total. Evenly arranged on the top of the shank 1, the angle between each cutting part 2 is 90 degrees.
[0017] The cutting part 2 is provided with three sections of continuous curved blades 4 , and the cross-sectional areas of the three sections of blades 4 decrease successively by 25% from the top of the handle 1 .
[0018] ...
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The invention relates to a pulley-groove finish-milling compound milling cutter belonging to the technical field of machine manufacturing. The compound milling cutter comprises a handle, a chip groove and a cutting part, wherein the cutting part is arranged on the top end of the handle, the chip groove is penetrated through the cutting part, the cutting part is provided with a plurality of cutting edges, the cross sectional areas of the cutting edges are orderly decreased from the top end of the handle at a rate of 25%, the rear cutter face of each cutting edge is provided with an edge strip of which the width is 0.15-0.3mm, the helical angle of the chip groove is 0 degree, and the front angle of the cutting part is 0 degree. The invention develops a fir tree-type pulley-groove finish-milling compound milling cutter for a 1000MW large steam turbine, and combines the original-process V-shaped rough milling cutter, the deepening milling cutter and semi-finish milling cutter into one to simultaneously complete rough machining and semi-finishing, thereby raising the production efficiency and lowering the cost.
Description
technical field [0001] The invention relates to a cutting tool in the technical field of mechanical manufacturing, in particular to a compound milling cutter for fine milling wheel grooves used for machining 1000MW steam turbine rotors. Background technique [0002] The steam turbine rotor, as its core part, bears complex loads in harsh working environments, so it has strict requirements on the quality of the machined surface of the parts. The 1000MW high-power steam turbine rotor unit has a clear index requirement for the residual stress of the surface layer of the final wheel groove processing, that is, there is a residual compressive stress of 300MPa at 0.5mm at the root of the final wheel groove, and the existence of residual compressive stress can offset the centrifugal force of the high-speed rotation of the rotor. In order to improve the bearing capacity and fatigue strength of parts. This is undoubtedly another challenge to the wheel groove processing technology. T...
Claims
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IPC IPC(8): B23C5/10B23C3/34
Inventor 陈明李军利许辉安庆龙胡江林
Owner SHANGHAI JIAO TONG UNIV