Segmented Coating Roller for Cylindrical Hollow Bodies
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Solution Overview
Problem
Existing coating technologies are inefficient and costly for applying a uniform coating to the outer surfaces of cylindrical hollow bodies, often resulting in uncontrolled coating application and excessive wear of coating rollers.
Innovation Solution
A coating apparatus with a rotatable workpiece table and a coating roller that features a segmented surface with a coating area and a free-wheeling region, allowing for slip-free rolling contact with the cylindrical hollow body while preventing unwanted contact during rotary movements, ensuring uniform coating application without excessive wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coating roller continuously contacts the cylindrical hollow body during rotary movement, then coating application is maintained, but uncontrolled coating application and excessive wear occur
Solution Approach 1:
The coating roller surface is segmented into a coating area and a free-wheeling region. The coating area has a constant circular radius and contacts the workpiece for coating application, while the free-wheeling region has surface sections at a smaller distance from the rotational axis, preventing contact during rotary movement. This segmentation resolves the contradiction by enabling controlled coating application only when needed while preventing excessive wear during transport movements.
2Manufacturing precision
If the coating roller applies coating during rotary step movement, then coating is applied, but uncontrolled coating application occurs
Solution Approach 1:
The coating process uses periodic action by implementing a rotary step movement of the workpiece rotary table that includes acceleration, deceleration, and holding periods. The coating roller contacts the workpiece only during holding periods when the system is stationary, ensuring controlled and uniform coating application. During acceleration and deceleration phases, the free-wheeling region prevents contact, avoiding uncontrolled coating application while maintaining productivity through efficient periodic cycles.
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
The solution enables cost-effective, uniform coating of cylindrical hollow bodies by synchronizing the rotary movement of the workpiece table with the coating roller's rotation, preventing undesired contact and ensuring efficient coating without disproportionate wear on the coating roller.
Implementation Method 1
the coating area of the coating roller is in contact with the outer surface of the cylindrical hollow body to allow a contact, preferably a line contact, between the coating area and the outer surface
Implementation Method 2
the free-wheeling region of the coating roller cannot come into physical contact with the outer surface of the cylindrical hollow body, which is achieved by the surface portions of the free-wheeling region having a distance from the axis of rotation of the coating roller smaller than the circular radius of the coating region
Data Source
AI summary
Coating apparatus for coating cylindrical hollow bodies, having a machine frame and a workpiece rotary table which is equipped with a plurality of holding mandrels mounted rotatably on the workpiece rotary table, and having a coating station arranged on the machine frame, wherein the coating station includes a rotatably mounted coating roller, wherein axes of rotation of the holding mandrels and an axis of rotation of the coating roller are aligned parallel to one another, wherein the coating roller has a coating region and a free-wheeling region on a circumferential surface, the coating region being designed as a circular cylinder segment with a constant circular radius coaxial with the axis of rotation of the coating roller, and the free-wheeling region being formed from surface sections which each have a distance from the axis of rotation of the coating roller which is smaller than the circular radius.