Monitoring method for vibration drilling state of stack structure material

Patent metadata

Field	Value
Publication number	US-12189358-B2
Application number	US-202117524463-A
Country	US
Kind code	B2
Filing date	Nov 11, 2021
Priority date	Nov 13, 2020
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

A state monitoring method for vibration drilling of a stack structure material is provided. A load power and a torque value of a drilling spindle is monitored during machining. Drilling state are divided according to a machining material of a drill. According to a data of a test library, reference thresholds of two monitoring objects for judging the change of the drilling state are set to achieve the state monitoring for the drilling process. The method monitors the machining process through the monitoring module in the machining system.

First claim

What is claimed is:

1. A monitoring method for vibration drilling state of a stack structure material, comprising:
obtaining a sequence of various stack structure material in the stack structure to be machined, and searching test database to obtain various quasi-machining states to be sequentially implemented by a drill and corresponding machining parameters of a drill bit for the various quasi-machining states;
controlling the drill bit to machine the stack structure to be machined, and receiving a real-time machining state of the drill through the monitoring system; and
comparing the real-time machining state of the drill with each of the various quasi-machining states to be sequentially implemented by the drill, and controlling the stack structure to be machined by the drill bit to be machined according to machining parameters of one of the quasi-machining states, if an absolute value of a difference between a spindle power of the real-time machining state and a spindle power of the one of the quasi-machining states is less than a predetermined power error threshold or an absolute value of a difference between a torque value of the real-time machining state and a torque value of the one of the quasi-machining states is less than a predetermined torque error threshold, wherein each of the quasi-machining states indicates a state to be machined;
wherein the test database comprises:
following three conditions for each stack structure material in a set N of the stack structure material: when the drill bit starts to enter the stack structure material till the drill bit enters the stack structure material completely, when the drill bit is within the stack structure material completely, and when the drill bit starts to drill out from the stack structure material till the drill bit drills out from the stack structure material completely;
wherein each of the quasi-machining states comprises a spindle power and a torque value;
following conditions for any two stack structure materials M 1 and M 2 in the set N of the stack structure material: when the drill bit starts to drill out from a stack structure material M 1 to enter a stack structure material M 2 till the drill bit drills out from the stack structure material M 1 completely to enter the stack structure material M 2 , wherein the quasi-machining states of the conditions are recorded to the test database; and
the machining parameters of the drill bit for each of the conditions.

2. A monitoring device, comprising:
a test database, which is communicatively connected with a numerical control system, and is configured to comprise:
following three conditions for each stack structure material in a set N of the stack structure material: when the drill bit starts to enter the stack structure material till the drill bit enters the stack structure material completely, when the drill bit is within the stack structure material completely, and when the drill bit starts to drill out from the stack structure material till the drill bit drills out from the stack structure material completely; wherein each of a plurality of quasi-machining states comprises a spindle power and a torque value, and each of the quasi-machining states indicates a state to be machined;
following conditions for any two stack structure materials M 1 and M 2 in the set N of the stack structure material: when the drill bit starts to drill out from a stack structure material M 1 to enter a stack structure material M 2 till the drill bit drills out from the stack structure material M 1 completely to enter the stack structure material M 2 , wherein the quasi-machining states of the conditions are recorded to the test database; and
machining parameters of the drill bit for each of the conditions;
an execution system, which is communicatively connected with the numerical control system;
a monitoring system, which is communicatively connected with the numerical control system and the execution system; and
the numerical control system, which is configured for:
obtaining a sequence of various stack structure material in the stack structure to be machined, and searching the test database to obtain various quasi-machining states to be sequentially implemented by a drill and corresponding machining parameters of a drill bit for the various quasi-machining states;
controlling the drill bit to machine the stack structure to be machined, and receiving a real-time machining state of the drill through the monitoring system; and
comparing the real-time machining state of the drill with each of the various quasi-machining states to be sequentially implemented by the drill, and controlling the stack structure to be machined by the drill bit to be machined according to machining parameters of one of the quasi-machining states, if an absolute value of a difference between a spindle power of the real-time machining state and a spindle power of the one of the quasi-machining states is less than a predetermined power error threshold or an absolute value of a difference between a torque value of the real-time machining state and a torque value of the one of the quasi-machining states is less than a predetermined torque error threshold.

Assignees

• Univ Nanjing Aeronautics & Astronautics

Inventors

• Chen Yan
• Guo Nan
• Yan Chaoren
• Fu Yucan
• Su Honghua
• Xu Jiuhua
• Zhang Quanli

Classifications

• B23Q15/12

  Adaptive control, i.e. adjusting itself to have a performance which is optimum according to a preassigned criterion · CPC title

• G05B2219/36284

  Use of database for machining parameters, material, cutting method, tools · CPC title

• B23Q17/0971

  by measuring mechanical vibrations of parts of the machine (arrangements for measuring vibrations B23Q17/12) · CPC title

• B23Q17/0961

  by measuring power, current or torque of a motor · CPC title

• B23Q15/013

  Control or regulation of feed movement (B23Q15/12 takes precedence) · CPC title