Cutting Tool Velocity Control via Opposing Table Rotation

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Solution Overview

Problem

Existing cutting methods for forming inner and outer circumferential faces of a work, such as orbit machining and those involving table movement, are limited by restricted cutting velocity and require complex control operations, lacking a simple and efficient method to increase cutting tool velocity.

Innovation Solution

A cutting method where the table supporting the work rotates in the opposite direction to the main shaft, with an adjustable cutting tool and a movable turning center, allowing for increased cutting velocity through control of a small number of parameters, including turning and rotating angular velocities and turning radius, eliminating the need for complex control calculations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If orbit machining is used with main shaft turning around a predetermined center, then machining can be achieved at whatever position the table supporting the work is located, but the cutting velocity is limited because the work is not rotated

Engineering Contradiction:

Improvemachining position flexibilityVSAvoidcutting velocity

Core Design Contradiction:

Adaptability or versatilityVSSpeed

Solution Approach 1:

The invention merges the rotation of the main shaft with the rotation of the workpiece on the table. Both rotational motions are combined to achieve high cutting velocity while maintaining the ability to machine at various positions, thus resolving the contradiction between position flexibility and cutting speed.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention introduces dynamic rotation of the workpiece on the table in addition to the main shaft turning. This dynamic adjustment allows the system to optimize cutting velocity by rotating the workpiece, while still maintaining adaptability to machine at different positions through coordinated control of the table rotation and main shaft turning.

Inventive Principle:

Principle #15Dynamics

2Speed

If table movement is added to main shaft rotation to increase cutting velocity, then cutting velocity can be increased, but complicated control expressions are required

Engineering Contradiction:

Improvecutting velocityVSAvoidcontrol complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

Instead of moving the table linearly to increase cutting velocity, the invention inverts the approach by rotating the table with the workpiece. This rotational movement simplifies the control mechanism while achieving the same effect of increasing cutting velocity, eliminating the need for complicated control expressions.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The invention changes the control parameters from linear table movement to rotational table movement. By controlling the rotational speed of the table and the turning speed of the main shaft, the system achieves high cutting velocity with simpler control expressions, resolving the contradiction between speed increase and control complexity.

Inventive Principle:

Principle #35Parameter changes

3Speed

If main shaft rotation is reinforced by circular arc motion of the work, then cutting velocity can be increased, but complicated synchronization control is required

Engineering Contradiction:

Improvecutting velocityVSAvoidcontrol operation simplicity

Core Design Contradiction:

SpeedVSEase of operation

Solution Approach 1:

The invention merges the circular arc motion of the workpiece with the main shaft rotation in a coordinated manner. By synchronizing the table rotation and main shaft turning through a unified control system, the invention achieves high cutting velocity while simplifying the operational control compared to separate synchronization requirements.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The table serves multiple functions: it supports the workpiece, rotates to increase cutting velocity, and positions the workpiece for different machining operations. This multi-functionality reduces the need for separate control mechanisms, simplifying the overall operation while maintaining high cutting velocity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Device complexity

If the table moves linearly by using ball screw, then the structure is simple, but the cutting velocity cannot be increased

Engineering Contradiction:

Improvestructural simplicityVSAvoidcutting velocity

Core Design Contradiction:

Device complexityVSSpeed

Solution Approach 1:

The invention transforms the static linear movement mechanism into a dynamic rotational system. By rotating the table instead of moving it linearly, the system maintains structural simplicity while dramatically increasing cutting velocity, as the rotational motion allows for higher speeds without compromising the basic mechanical structure.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS9833841B2Cutting method for inner circumferential face or outer circumferential face of work

Publication Date: 2017.12.05 MATSUURA MACHINERY CO LTD

AI summary

A cutting method for an inner circumferential face or an outer circumferential face of a work using a cutting tool projecting from a main shaft which turns around a predetermined position serving as a center and for which a turning radius is adjustable, wherein a table that supports the work is set in a rotating central axis that is coaxial with a turning central axis of the main shaft, and the table is rotated in a direction opposite to a turning direction of the main shaft to increase a cutting velocity. The cutting method allows an increase to the cutting velocity under simple control.