Deep hole machining method for numerical control machine tool gantry pentahedron

Abstract

The invention relates to a deep hole machining method for a numerical control machine tool gantry pentahedron. The method comprises the following steps of (1) detecting and regulating the levelness of a workbench; (2) detecting perpendicularity between axes X and Y; (3) detecting and regulating perpendicularity between an axis Z and each of the axes X and Y; (4) roughly boring and semi-finely boring a deep hole; (5) detecting and regulating the axial run-out, radial run-out and concentricity of the axis of a taper hole of a right-angled milling head and the concentricity of the axle center of the right-angled milling head in directions of 90 and 270 degrees; (6) clamping a fine boring tool on the right-angled milling head, feeding the fine boring tool from one end face of the deep hole in the direction of 90 degrees for machining, retracting the fine boring tool to a specified position when a half of the depth of the deep hole is finely bored, rotating the right-angled milling head to the direction of 270 degrees, and finely boring the other part from the other end face of the deep hole by using the fine boring tool. According to the method, accuracy parameters of the machine tool are detected and regulated before a workpiece is machined, and the axial and radial run-out of the axis of the taper hole of the right-angled milling head is detected and regulated before the deep hole is finely bored, so that the machining accuracy of equipment is improved, and a deep hole with a great diameter is accurately machined.

Description

technical field [0001] The invention relates to a deep hole processing method of a gantry pentahedron numerical control (processing) machine tool, in particular to a deep hole processing method with a hole depth greater than or equal to 800 mm. Background technique [0002] In the current technology, for those large workpieces with deep hole finishing requirements, such as a large CNC punch base, 2090mm long, 1400mm wide, 900mm high, and 6.5 tons in weight, the equipment hole (divided into four stages) has a diameter of 245mm, The diameter tolerance is 0.02mm, the hole depth is 920mm, the concentricity is 0.02mm, and the flatness is 0.01mm. It is difficult to process deep holes for such workpieces. The conventional processing plan: use large precision CNC machine tools including gantry pentahedron. The previous process is to rough and finish the size of the six faces and the rough boring deep hole allowance. The final process is to fine-boring the holes in two stages from th...

AI Technical Summary

Problems solved by technology

Due to the large machining allowance of the overall workpiece, the stress and deformation are large, the number of repeated positioning is large, and the large-diameter and ultra-long boring tool processes this part, so the weight of the tool is also too heavy. The processing process is affected by the spindle speed, gravity, processing extrusion force, etc. , resulting in increased machining errors, accumulating precision errors in all aspects of the machine tool, and it is difficult to maintain the shape and position tolerance of large workpieces within 0.02mm

[0003] Although the large pentahedron is currently used in the market to process this workpiece, because the dimensional accuracy requirements in the drawing are too high, the processing surface is large, and the related dimensions are mutually constrained, the workpiece is too large, and machine tools, tools, tooling, inspection tools, and personnel produce cumulative errors. The highest machining accuracy is only 0.04mm, which cannot meet the design requirements of the customer's large-scale CNC punch press assembly accuracy

Images