Hard alloy integral type expansion-extrusion countersink for machining deep hole

Abstract

The invention provides a hard alloy integral type expansion-extrusion countersink for machining a deep hole. The countersink comprises a hard alloy circular cutter bar. The countersink is characterized in that the front half section of the hard alloy circular cutter bar is evenly provided with 4-6 twist bit-shaped spiral grooves, and the lift angle of each spiral groove is 20-25 degrees; the leading surfaces along the rotation direction of the excircle surfaces of the spiral bodies between every two adjoining spiral grooves are raised along the radial direction to have spiral blade belts, the circumferential belt width of each spiral blade belt is 0.5-1.2mm, the radial raised height of each spiral blade belt is 0.3-0.5mm, and the relief angle of each spiral blade belt is 0 degree; the front end face of each spiral body 5 is inwards concaved, the front end face of each spiral body is provided with a radial blade which is raised out of the front end face of each spiral body from the tail end of each spiral blade belt to the axial lead of the circular cutter bar, the width of each radial blade is 0.8-1.0mm, the concave inclined angle Q of the vertical plane between the front end face of each radial blade and the axial lead of the circular cutter bar 1 is 3 degrees, and the relief angle of each radial blade is 6-8 degrees. The hard alloy integral type expansion-extrusion countersink has the advantages that the countersink is good in manufacturability, and convenient to machine, the dimensional accuracy is easy and stable to control, and the expansion and the extrusion can be completed at once.

Description

Technical field: [0001] The invention relates to a machining tool, in particular to a cemented carbide integral expanding and extruding countersinking tool for deep hole machining. Background technique: [0002] The deep hole finishing of aluminum alloy parts generally adopts drilling, rough boring, fine boring process, or drilling, expanding and reaming process. Drilling and reaming combination tools are often used in mass production. This processing method generally uses a reaming knife to ream the hole first, and then finely reams it with a reamer, which is divided into two processes. The reaming structure is that there are four short-range helical grooves in the front section of the circular cutter bar, and the helical grooves are welded to fix the short-range helical blades on the front of the helical grooves. The helix angle is generally 20° (referring to the space angle formed by the helix and the axis line) , The round knife rod is made of 45# steel, and the blade ...

AI Technical Summary

Problems solved by technology

Expanding and reaming are divided into two processes, which need to change tools and correct, and this process takes a long time

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