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A Redundancy Strategy Method for Sensorless Monitoring of Spindle Overload

A redundant strategy and sensor technology, applied in the direction of instruments, simulators, program control, etc., can solve problems such as lack of CNC system, spindle stall, machine tool damage, etc., to achieve the effect of meeting functional requirements

Active Publication Date: 2022-05-17
北京北一机床有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the process of "roughing" (rough machining or semi-finishing) using CNC machine tools, the phenomenon of spindle tool "stuck" (spindle stalling) often occurs, which may cause damage / damage to the tool in the slightest, and damage or damage to the machine tool in severe cases. personal injury
Common machine tool monitoring generally cannot effectively avoid this problem
The load monitoring of the general CNC machine tool spindle is realized through the drive load function of the spindle motor. According to the limit of 200% overload of the motor, and the delay after the motor does not heat up, the system will perform shutdown alarm processing, which only plays a role in protecting the motor. , without solving the safety hazards and economic losses caused by the above-mentioned "stuffy knife" phenomenon caused by damage to the knife
The existing CNC system lacks electromechanical matching monitoring countermeasures for various factors such as cutting tools, cutting parameters and machine tool spindle structure used by CNC machine tools

Method used

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  • A Redundancy Strategy Method for Sensorless Monitoring of Spindle Overload

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: as figure 1 As shown, a redundant strategy method for sensorless monitoring of spindle overload includes the following steps: Embedding a spindle load redundancy monitoring subroutine in the built-in PLC program of the system.

[0013] The spindle load redundancy monitoring subroutine includes: configuration of the available data in the spindle structure parameters and spindle motor parameters to the program custom parameter area; start the program: function activation function valid bit and spindle rotation command and speed arrival; program stop: spindle The stop command skips this function subroutine.

[0014] Spindle load redundancy monitoring subroutine creation and cyclic operation process:

[0015] Step 1. Calculate the motor speed according to the current gear of the spindle speed; judge whether the motor speed reaches the rated speed (monitoring judgment node): if the speed is lower than the rated speed branch, calculate the current rated power o...

Embodiment 2

[0018] Embodiment 2: as figure 1 Shown, a kind of sensorless monitoring spindle overload redundant strategy method, contains the following steps;

[0019] Program initial conditions: according to different CNC system resources, define and configure special variables for machine tools with different structures, such as the rated power of the spindle motor P11 configured on the machine tool, the variable speed ratio variable G of the multi-gear spindle structure, etc. The data can be set through the initial setting or system variable acquisition;

[0020] Step 1. The program function configuration conditions are met, and the strategy algorithm starts;

[0021] Step 2. The program obtains the special variable value according to the current state,

[0022] Step 3, judging a: whether the gear ratio G of the main shaft shifting mechanism is 1;

[0023] Step 4, judging that a is Y (established), variable assignment: spindle speed (n23)=motor speed (n12); judging that a is N (not e...

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Abstract

The invention relates to a redundant strategy method for sensorless monitoring spindle overload, which belongs to the technical field of monitoring electromechanical matching of numerical control machine tools. Using self-defined permanent storage parameters and monitoring status data resources, as well as sensorless structure identification, that is, identification of the current configuration of the spindle and the spindle motor, according to the general power torque curve of the spindle, the current motor operation warning value is calculated, and the redundant function embedded in real-time monitoring is adopted. subroutine to avoid spindle overload. The advantage of the present invention is: according to this strategy method and the built-in PLC program of the system, the redundant function subroutine is embedded, and under the conditions of defining the specific spindle configuration parameters, function application parameters and specific modes, the PLC subroutine can be monitored in a real-time cycle And calculate the current spindle load, which can safely and reliably meet the functional requirements of different CNC systems.

Description

technical field [0001] The invention relates to a redundant strategy method for monitoring spindle overload without a sensor, and belongs to the technical field of monitoring electromechanical matching of numerical control machine tools. Background technique [0002] In the process of "roughing" (rough machining or semi-finishing) using CNC machine tools, the phenomenon of spindle tool "stuck" (spindle stalling) often occurs, which may cause damage / damage to the tool in the slightest, and damage or damage to the machine tool in severe cases. personal injury. Common machine tool monitoring generally cannot effectively avoid this problem. The load monitoring of the general CNC machine tool spindle is realized through the drive load function of the spindle motor. According to the limit of 200% overload of the motor, and the delay after the motor does not heat up, the system will perform shutdown alarm processing, which only plays a role in protecting the motor. , without solv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/4065
CPCG05B19/4065G05B2219/37616Y02P70/10
Inventor 何江涛罗宗兰李丹丹赵然
Owner 北京北一机床有限责任公司