Deep hole drilling depth optimizing method based on chip discharging force model
An optimization method and deep hole drilling technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of low processing efficiency and lack of theoretical basis, and achieve the effect of improving processing efficiency
Active Publication Date: 2018-01-19
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
[0003] In order to overcome the low processing efficiency of existing deep hole drilling methods, the present invention provides a deep hole drilling depth optimization method based on chip removal force model
The method of the present invention realizes the purpose of setting a reasonable drilling depth according to a theoretical model before deep hole drilling, solves the problem that the current drilling depth value selection depends on experience and lacks theoretical basis, and ensures that the deep hole drilling process does not occur Maximize machining efficiency while breaking the knife
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[0019] refer to Figure 1-5 . The specific steps of the deep hole drilling depth optimization method based on the chip removal force model in the present invention are as follows:
[0020] 1. Establish a deep hole drilling force model based on chip removal force.
[0021] Firstly, the micro-element method is used to establish the chip removal force model. During the deep hole drilling process, the chips move at a constant speed in the space surrounded by the hole wall and the chip flute, and its motion can be decomposed into components in two directions, namely, the flow along the chip flute and the rotational movement with the drill bit. Each section of chips maintains a state of force balance under the action of its adjacent chips, the friction with the hole wall and the chip flute, and the pressure. Divide the chips into several microelements along the direction of the chip flute, and thus obtain the force balance equation in the flow direction of the chip microelements ...
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The invention discloses a deep hole drilling depth optimizing method based on a chip discharging force model and aims at solving the technical problem of low machining efficiency of an existing deep hole drilling method. According to the technical scheme, the chip discharging force model and computational formulas of an axial chip discharging force and a tangential chip discharging force are deduced through an infinitesimal method, and thus the quantitative relation about a drilling force and drilling depth is established; then, a given drill bit and a model coefficient under drilling parameters are calibrated through a shallow hole drilling test; finally, the optimized drilling depth is calculated by combining with the maximum allowable torque of the drill bit and utilizing the model. Byadopting the method, the purpose of setting reasonable drilling depth according a theoretical model before deep hole drilling is achieved, the problem that selection of existing drilling depth value depends on experiences and a theoretical basis is lacked is solved, and the machining efficiency is improved to the greatest degree while tool breakage does not occur in the deep hole drilling process.
Description
technical field [0001] The invention relates to a deep hole drilling method, in particular to a deep hole drilling depth optimization method based on a chip removal force model. Background technique [0002] The document "Drilling Deep Holes with Twist Drills, Metal Processing (Cold Working) Cold Working, 2003, Vol (12), p18-19" discloses a deep hole drilling method that adopts multiple tool retraction and chip removal, and starts from the drill bit edge. The technological process and parameter optimization strategy of this method are given in terms of grinding, the connection between the drill bit and the drill pipe, and the setting of the drilling speed. In the method, the tool is retracted several times at regular intervals during the drilling process, and the chips in the chip groove of the drill pipe are removed by the scouring action of the cutting fluid during the tool retraction. The specific implementation method is to set a drilling depth value in the NC program, ...
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IPC IPC(8): G06F17/50
Inventor 张定华韩策吴宝海罗明
Owner NORTHWESTERN POLYTECHNICAL UNIV