Adjustable Cam Feed Mechanism for Variable-Rate Machining
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing machine tools with constant feed rates are limited in versatility and require bulky, expensive, and time-consuming mechanisms to adjust for variable feed rates, making it difficult to change feed rates or stop the tool while rotating during machining.
Innovation Solution
An adjustable feed mechanism using a plurality of cam segments and a cam lifter that pivots about a central axis, allowing for continuous adjustment of the feed rate by rotating the cam lifter, enabling the cam follower to pivot through a cam activation angle while revolving around the central axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a machine tool uses a constant feed rate, then the toolpath can traverse the working area efficiently, but the functional versatility of the machine tool is limited
Solution Approach 1:
The patent implements a variable feed rate mechanism that allows the feed rate to be dynamically adjusted during machining operations. The cam-based mechanism enables continuous variation of the feed rate while the tool is rotating and engaged with the workpiece, transforming the system from static (constant feed rate) to dynamic (variable feed rate) operation.
2Adaptability or versatility
If mechanisms are added to achieve a variable feed rate, then the machine tool can operate on work pieces of various dimensions and geometries, but the mechanisms become bulky, expensive, and time-consuming to adjust
Solution Approach 1:
The feed mechanism is divided into discrete cam segments that can be independently positioned. Each cam segment represents a specific feed rate configuration, and by selecting and positioning different cam segments, the mechanism achieves variable feed rates without requiring a complex continuously-variable transmission system.
Solution Approach 2:
The patent employs cam surfaces with specific curvature profiles to generate the desired feed motion. The curved cam surfaces transform rotational motion into the required feed motion patterns, enabling compact design while achieving complex variable feed rate profiles.
3Adaptability or versatility
If gear mechanisms are used to transition among discrete feed rates, then multiple feed rates can be achieved, but it becomes difficult or impossible to change the feed rate or stop the feed while the machine tool continues to rotate the tool
Solution Approach 1:
The cam mechanism serves as an intermediary between the rotary motion of the tool and the linear feed motion. This intermediary allows for smooth, continuous control of the feed rate independent of the tool rotation, enabling feed rate changes and feed stops without interrupting the rotational motion of the tool.
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
Enables precise and continuous adjustment of the feed rate during machining, allowing the tool to translate with respect to a rotary element while rotating, enhancing the machine tool's versatility and operational efficiency.
Implementation Method 1
a cam follower biased toward the cam lifter and configured to revolve about the central axis and to move along the outer cam surfaces of the plurality of cam segments sequentially
Implementation Method 2
The cam follower is pivotally coupled to the feed output assembly. The cam follower is configured to pivot in a first pivot direction with respect to the feed output assembly when the cam follower moves away from the cam lifter
Data Source
AI summary
Adjustable feed mechanisms, machining assemblies including the same, and associated methods. An adjustable feed mechanism includes a plurality of cam segments and a cam lifter configured to pivot each cam segment about a corresponding cam pivot point. An adjustable feed mechanism additionally includes a cam follower and a feed output assembly. The cam follower moves along the cam segments sequentially and is pivotally coupled to the feed output assembly. The cam follower pivots through a cam activation angle when moving along a given cam segment to produce the feed output. A machining assembly includes a mount assembly, a rotary element, and an adjustable feed mechanism. A method of utilizing a machining assembly to machine a work piece includes engaging the work piece with a machining assembly, positioning the tool head with respect to the work surface of the work piece, and machining the work surface.