Hole pitch error correction system for numerical control multi-spindle deep hole drilling machine

Abstract

The invention relates to a drill spindle system for a multi-spindle deep hole drilling machine. Errors of a plurality of drill spindles for drilling deep holes are corrected by means of mechanical elastic deformation principle. The drill spindle system is characterized in that a drill rod slightly bends and elastically deforms when the acting force of a fine adjustment screw acts at the center of the drill rod, the deformation of the drill rod is determined by means of calculation according to the hole pitch error value of a tool discharge surface of a drilled workpiece (namely the back surface of the workpiece), the position of a drill bit in a drill bushing is slightly shifted relative to an original position at the moment, and the offset value of the drill bit exactly compensates the hole pitch error value of the tool discharge surface when the drill bit axially moves to the tool discharge surface of the workpiece in a drilling manner. The drill rod reliably and axially moves in a drilling manner through a guide sleeve of an embedded structure, holes of different sizes can be machined by changing drill bits, drill rods and buttress sleeves of different sizes, and the hole pitch error correction system enables the drill spindles of the multi-spindle deep hole drilling machine to simultaneously drill 1000mm deep holes with extremely small adjacent hole pitch errors and accumulated hole pitch errors.

Description

technical field [0001] The patent of the present invention relates to a hole pitch error correction system of a CNC multi-axis deep hole drilling machine, especially when the drill shaft drills deep holes, the method of elastically deforming the drill rod is adopted, and the axial cutting movement is guided by a special drill sleeve, and the composition is composed of A multi-axis deep hole drilling machine hole distance error correction system is proposed. Background technique [0002] It can be seen from the existing data that the accuracy of the hole pitch of the multi-axis deep hole drilling machine is not high. For example, the nuclear power evaporator tube plate with a number of holes up to 3000mm to 10000, a hole diameter of 12mm to 32mm, and a hole depth of 1000mm is processed by a three-axis deep hole drilling machine. It is difficult to meet the requirements of adjacent accuracy and accumulative accuracy of ≤0.10mm for the hole distance of the cutting surface of th...

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Problems solved by technology

[0002] It can be seen from the existing data that the accuracy of the hole pitch of the multi-axis deep hole drilling machine is not high. For example, the nuclear power evaporator tube plate with the number of holes up to 3000mm to 10000, the hole diameter of 12mm to 32mm, and the hole depth of 1000mm is processed by a three-axis deep hole drilling machine. It is difficult to meet the requirements of adjacent accuracy and accumulative accuracy of ≤0.10mm for the hole distance of the cutting surface of the tube plate. For example, the BW500-3-1800-CNC CNC three-axis deep hole drilling machine of the German KOLB company, which is internationally representative, is difficult to achieve For this requirement, only two drilling spindles can be used to process

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