Bar Material Supply Device Motor Cylinder Coordination
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Solution Overview
Problem
Existing bar material supplying devices struggle to chuck thick bar materials with diameters of 40 mm or more due to insufficient motor driving force, leading to insertion failures.
Innovation Solution
The device incorporates a feed rod with a finger chuck, a motor, and an air cylinder device, where the control system coordinates the motor and cylinder to enhance driving force, allowing for successful chucking and releasing of bar materials by adjusting the allowable error range during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a motor is used to drive the feed rod for inserting bar material into the finger chuck, then the device can operate automatically, but the driving force is insufficient for thick bar materials with diameter of 40 mm or more
Solution Approach 1:
The patent combines a motor and a cylinder device to drive the feed rod together. The motor provides continuous automatic operation while the cylinder device provides additional driving force during the insertion process. This merging of two different actuation mechanisms resolves the contradiction by maintaining automation while increasing the available driving force for thick bar materials.
2Ease of operation
If the feed rod is moved backward to release the bar material from the finger chuck, then the bar material can be exchanged, but the position of the bar material is fixed and cannot accommodate thick bar materials
Solution Approach 1:
The patent makes the finger chuck dynamic by enabling it to expand and contract. The finger chuck can expand to accommodate thick bar materials with diameter of 40 mm or more, and contract to release the bar material for exchange. This dynamic capability allows the device to maintain ease of operation while increasing adaptability to different bar material sizes.
3Measurement precision
If the motor drives the feed rod with high precision, then the operation accuracy is high, but the error of operation amount cannot be allowed when the cylinder device operates simultaneously
Solution Approach 1:
The patent incorporates an error allowable device that provides a predetermined margin of error in the control system. This cushioning allows the motor and cylinder device to operate simultaneously without requiring perfect synchronization, reducing control complexity while maintaining sufficient operation accuracy for the bar material insertion and release processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures successful insertion and release of bar materials with diameters up to 40 mm by combining motor and cylinder driving forces, preventing operational errors and improving the efficiency of the bar material supplying device and NC machine tool.
Implementation Method 1
a cylinder device; and a control device configured to control driving of the motor and driving of the cylinder device, wherein each of the motor and the cylinder device is configured to move the feed rod in a longitudinal direction to insert and pull the bar material into and from the finger chuck
Data Source
AI summary
In a bar material supplying device and a numerical control machine tool having the bar material supplying device, a bar material can be chucked even when driving force of a motor is insufficient. The bar material supplying device includes a feed rod (60) having a leading end provided with a finger chuck (61), a feed rod servomotor (74) and an air cylinder device (80) that move the feed rod (60) in a longitudinal direction to insert and pull the bar material (200) into and from the finger chuck (61), and an NC device (90) that controls driving of the feed rod servomotor (74) and driving of the air cylinder device (80). The NC device (90) controls the driving of the feed rod servomotor (74) and the driving of the air cylinder device (80) to move the feed rod (60) in an operation of inserting and pulling the bar material (200) into and from the finger chuck (61), and operates as an error allowable device that allows an error of an operation amount of the feed rod servomotor motor (74) in the operation of inserting and pulling the bar material (200) into and from the finger chuck (61).