Numerical Controller Bell-Type Deceleration Drilling
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Solution Overview
Problem
Existing drilling operations face increased processing time due to the need to stop the tool at the bottom of a hole, which is caused by the deceleration mode used in drilling, leading to reduced machine efficiency.
Innovation Solution
A numerical controller that selects a bell-type acceleration/deceleration mode from a constant speed state to a linear deceleration state, maintaining the same constant rate for smooth deceleration and then linear acceleration/deceleration to prevent tool stoppage at the hole bottom, along with a deficient-movement-amount calculation and accuracy compensation to ensure precise machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If bell-type acceleration/deceleration mode is used to reduce impact on the machine, then the tool speed is smoothly changed and impact is reduced, but the tool stops at the bottom of the hole which increases processing time
Solution Approach 1:
The deceleration process is divided into two distinct phases: a first deceleration phase from constant speed to a predetermined speed using bell-type acceleration/deceleration mode, and a second deceleration phase from the predetermined speed to stop using linear acceleration/deceleration mode. This segmentation allows the system to maintain smooth deceleration while avoiding complete stoppage at the hole bottom.
Solution Approach 2:
The invention changes the deceleration parameters by switching from bell-type mode (which causes speed to approach zero) to linear mode (which maintains a higher minimum speed). This parameter change ensures the tool does not stop at the hole bottom, thereby reducing processing time while still controlling the impact through the initial bell-type deceleration phase.
2Loss of time
If linear acceleration/deceleration mode is used for the entire process, then processing time is reduced, but the tool speed is abruptly changed causing increased impact on the machine
Solution Approach 1:
The deceleration process is divided into two distinct phases: a first deceleration phase from constant speed to a predetermined speed using bell-type acceleration/deceleration mode, and a second deceleration phase from the predetermined speed to stop using linear acceleration/deceleration mode. This segmentation allows the system to maintain smooth deceleration while avoiding complete stoppage at the hole bottom.
Solution Approach 2:
Different deceleration modes are applied to different portions of the deceleration process. The bell-type mode is used for the initial portion where smooth deceleration is needed to reduce impact, while linear mode is used for the final portion where maintaining speed is more critical for reducing processing time. This local differentiation optimizes both impact reduction and time efficiency.
Data Source
AI summary
A numerical controller controls a drilling operation. When a feed shaft is decelerated from the constant speed state to a stop state in a drilling operation, a bell-type acceleration/deceleration mode is selected from the constant speed state to a linear deceleration mode where deceleration is carried out at a constant rate, and then a linear deceleration mode in which a deceleration is carried out at the same constant rate as in the linear part, from the linear part to the stop state. Thus, it is possible to carry out a high-speed operation in the vicinity of a portion having a speed of zero around a hole bottom while performing a smooth deceleration.