Roll Mold Groove Sequencing to Minimize Optical Step
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In roll molds produced by conventional cutting techniques, an optical step occurs between adjacent linear grooves, leading to visible color differences or joints in transfer sheets, which affects product quality.
Innovation Solution
Optimizing the formation order of linear grooves on the roll circumference, rather than sequentially forming them to encircle the roll, reduces the optical step by controlling the wear of the cutting tool and ensuring a gradual decrease and increase in groove depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If linear grooves are sequentially formed to encircle the roll circumference, then the manufacturing process is simple and efficient, but an optical step occurs between adjacent linear grooves causing visible color differences in transfer sheets
Solution Approach 1:
The invention applies preliminary action by pre-calculating and pre-arranging the groove formation sequence to compensate for tool wear before the actual cutting process begins. The sequence is designed in advance to ensure that grooves formed at different times (with different tool wear states) are positioned such that their depth differences are minimized, thereby preventing optical steps before they occur.
Solution Approach 2:
The invention changes the parameter of groove formation sequence from a simple sequential order to an optimized sequence based on tool wear characteristics. By varying the positional parameters of where grooves are formed relative to the tool's wear state, the invention ensures that grooves formed with different tool wear levels are distributed in a way that minimizes depth variations, thus maintaining optical uniformity.
2Ease of manufacture
If a cutting tool is used to form linear grooves, then manufacturing costs are relatively low, but the cutting tool wears over time causing groove depth variations and optical steps
Solution Approach 1:
The invention implements feedback by using the known tool wear characteristic as feedback information to optimize the groove formation sequence. The sequence is designed based on the feedback that tool wear increases progressively, allowing the system to compensate for this wear by strategically positioning grooves formed at different wear stages, thereby maintaining groove depth consistency despite tool degradation.
Solution Approach 2:
The invention applies preliminary action by pre-planning the groove formation sequence to account for tool wear before cutting begins. The sequence is calculated in advance to ensure that grooves are formed in an order and positions that compensate for the anticipated tool wear, preventing depth variations before they occur during the actual cutting process.
3Manufacturing precision
If linear grooves are formed in the thrust direction or oblique thrust direction, then the roll mold can produce transfer sheets with fine structures, but adjacent grooves show visible boundaries due to optical steps
Solution Approach 1:
The invention changes the parameter of groove formation sequence to minimize optical steps while maintaining the thrust direction or oblique thrust direction cutting method that produces fine structures. By optimizing the sequence in which grooves are formed, the invention reduces the visibility of boundaries between adjacent grooves caused by optical steps, thereby improving the overall quality of the transfer sheet without sacrificing fine structure precision.
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 approach results in a roll mold with a significantly reduced optical step between adjacent linear grooves, producing transfer sheets with minimal visible boundaries in optical characteristics, thereby enhancing product quality.
Implementation Method 1
a technique of forming a concavo-convex structure on the outer peripheral surface of a roll base material by cutting work using a cutting tool
Data Source
AI summary
Provided is a manufacturing method for a roll mold. The method includes performing a process of forming a linear groove on an outer peripheral surface of a roll base material in a roll axial direction or a direction inclined with respect to the roll axial direction n times, where n is 800 or more. A total of m linear grooves of 1st to mth linear grooves are formed at respective positions that are made up of a position of 0 degrees and at least one position shifted a multiple of (360/m) degrees from the position of 0 degrees, the position of 0 degrees being any position on the outer peripheral surface of the roll base material. In the subsequent cutting processes, linear grooves are formed at respective positions shifted from the positions of the 1st to mth linear grooves in a predetermined direction.