关键词: 圆筒薄壁件, 内侧壁埋头孔, 群孔加工, 反镗铣削, 参数化编程

Abstract: Aiming at the engineering problems such as difficult deformation control, challenging precision achievement and low processing efficiency in the machining of high-precision countersunk cluster holes on the circumferential inner wall of cylindrical thin-walled parts, it proposes an integrated process solution based on a vertical four-axis machining center. By establishing a three-in-one machining system of ″thin-walled supporting expansion sleeve fixture + eccentric back boring and milling cutter + parametric macro program″, the machining deformation problem caused by insufficient rigidity of thin-walled parts is effectively solved. An innovatively designed wedge-shaped expansion sleeve mechanism realizes multi-directional constrained clamping of thin-walled parts, a back boring and milling cutter with eccentricity is designed to complete the one-step forming of 107° taper countersunk holes, and a parametric macro program module with a double-layer nested structure is constructed. Practical application shows that this process shortens the single-piece processing time from 8 h to 2.6 h, and the three-coordinate inspection results after processing fully meet the drawing requirements. The research results have important practical engineering application value for the efficient and high-quality machining process of countersunk holes on the circumferential inner wall of cylindrical thin-walled parts.

Key words: cylindrical thin-walled parts, inner wall countersunk holes, cluster hole machining, back boring and milling, parametric programming