Stepped boring cutter for boring large-aperture through holes
A large-aperture, stepped technology, applied in the direction of tools for lathes, turning equipment, accessories of toolholders, etc., can solve the problems of not meeting process requirements, out-of-tolerance aperture size, time-consuming and labor-intensive, etc., to improve dimensional accuracy and efficiency. Effects of surface roughness, reduced number of boring passes, and reduced boring cost
Pending Publication Date: 2019-08-23
CSSC MARINE POWER
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Problems solved by technology
Most of the existing rough boring and semi-finish boring of large-diameter through-holes use polygonal inserts, the cutting effect is not ideal, and the tool needs to be changed from rough boring to semi-finish boring, which is time-consuming and labor-intensive. The edge margin is only 0.2mm-0.3mm. If the semi-finish boring effect does not meet the process requirements, it will affect the next fine boring process, and even the base or connecting rod will be unqualified due to the out-of-tolerance hole size after semi-finish boring , cannot be transferred to the next fine boring process
Method used
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Embodiment Construction
[0020] The present invention will be further described below in conjunction with the accompanying drawings and the embodiment of boring the main bearing hole step boring tool of a certain type of low-speed marine diesel engine.
[0021] Such as Figure 1 to Figure 6 As shown, the step boring tool of this embodiment includes a cutterhead 1, a first set of rough boring blades and a shim unit 2, a second set of rough boring blades and a shim unit 3, and a set of semi-finishing blades and shim units 4. The material of the cutter head 1 is aluminum alloy. The center of the cutter head 1 is respectively provided with four screw connection holes 11 and four positioning holes 12 connected with the handle of the knife. The cutter head 1 is also provided with four lightening holes 13 . The cutter head 1 has an irregular profile, which serves to remove stress and increase the strength of the cutter.
[0022] Such as figure 1 and Figure 6 As shown, the first set of rough boring blades...
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The invention discloses a stepped boring cutter for boring large-aperture through holes. The stepped boring cutter comprises a cutter head, a first group of rough boring cutter blades and cutter cushion units, a second group of rough boring cutter blades and cutter cushion units, a group of semi-fine boring cutter blades and cutter cushion units, wherein the two groups of rough boring cutter blades and cutter cushion units and the one group of semi-fine boring cutter blades and cutter cushion units are axially arranged at intervals; each group of rough boring cutter blades and cutter cushion units comprises two diagonally arranged rough boring cutter blades and rough boring cutter cushions which are symmetrical with respect to the center of the cutter head, and the group of semi-fine boring cutter blades and cutter cushion units are positioned between the two groups of rough boring cutter blades and cutter cushion units. According to the boring cutter, cutting machining of two workingprocedures of rough boring and semi-fine boring can be completed through one-time boring, the number of boring passes is reduced by three quarters, the trouble of replacing the boring cutter is saved, and the cutting efficiency is greatly improved; and boring time is reduced by 80%, and the boring machining cost is greatly reduced. By adopting the stepped boring cutter to bore a large-aperture through hole, the dimensional accuracy and the surface roughness of the large-aperture through hole are improved.
Description
technical field [0001] The invention relates to a boring tool for boring holes, in particular to a special boring tool for boring large-diameter through holes with a diameter of more than 400 mm, and belongs to the technical field of metal cutting tools. Background technique [0002] There are large-diameter through-holes of Φ475mm (0, +0.05) to Φ723mm (0, +0.08) in the bases and connecting rods of various models of low-speed marine diesel engines with small and medium bores (bore Φ≤500mm), which need to be rough-bored, Only semi-finish boring and fine boring can meet the requirement of dimensional tolerance, among which the allowance on one side is larger during rough boring and semi-finish boring. Most of the existing rough boring and semi-finish boring of large-diameter through-holes use polygonal inserts, the cutting effect is not ideal, and the tool needs to be changed from rough boring to semi-finish boring, which is time-consuming and labor-intensive. The edge margin...
Claims
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Login to View More IPC IPC(8): B23B27/08
CPCB23B27/083
Inventor 张景李南徐希方廖新山黄维左欣
Owner CSSC MARINE POWER