Glass Roller Forming Speed Control for Precise Vials and Syringes
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Solution Overview
Problem
Existing methods for producing glass products, such as glass syringes, vials, and ampoules, face challenges in achieving high dimensional accuracy (e.g., 0.03 mm) and short cycle times due to issues like non-powered forming rollers causing inaccuracies, powered rollers requiring long cycle times and high lubricant consumption, and complex process control.
Innovation Solution
A method involving controlled rotation of glass intermediates and forming rollers with adjustable speeds and positions, using servo motors to maintain a consistent relative speed ratio and compensate for varying intermediate radii and thicknesses, allowing for multiple forming steps with precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If non-powered forming rollers are used, then device complexity is reduced, but manufacturing precision deteriorates due to high relative speeds and inertia causing glass intermediate twisting
Solution Approach 1:
The forming roller is designed with a variable diameter along its circumference, transforming from a static uniform cylinder to a dynamic shape that adapts during rotation. This variable geometry compensates for the high relative speed between roller and glass intermediate, maintaining dimensional accuracy without requiring complex powered drive systems or multi-step processes
2Manufacturing precision
If powered forming rollers with separate motors are used, then manufacturing precision is improved through controlled rotation, but productivity deteriorates due to long cycle times of approximately 5 seconds
Solution Approach 1:
The variable diameter forming roller enables a single-step forming process that achieves high dimensional accuracy without requiring the slow, controlled rotation of powered rollers. The dynamic geometry allows the roller to maintain optimal contact conditions throughout the forming cycle, reducing cycle time to under 1 second while preserving precision
3Manufacturing precision
If powered forming rollers are used, then manufacturing precision is improved, but loss of substance increases due to high lubricant consumption
Solution Approach 1:
The variable diameter configuration creates a forming roller that naturally maintains optimal contact pressure and speed conditions throughout the forming process. This reduces friction and heat generation, thereby decreasing lubricant requirements compared to powered rollers that require continuous lubrication to handle high relative speeds and contact pressures
4Manufacturing precision
If multi-step forming processes are used, then manufacturing precision can be maintained through intermediate cooling and reheating, but productivity deteriorates due to multiple processing steps
Solution Approach 1:
The variable diameter forming roller integrates multiple forming functions into a single continuous operation. The different sections of the roller's variable geometry perform different forming tasks sequentially as the glass intermediate passes through, eliminating the need for separate heating zones, cooling steps, and multiple roller changes that characterize traditional multi-step 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
Achieves high dimensional accuracy (0.1 mm or 0.03 mm) and short cycle times (up to 1 second) by ensuring consistent relative speeds and positions during the forming process, reducing lubricant consumption and simplifying process control.
Implementation Method 1
heat glass intermediates to temperatures above the transformation temperature
Implementation Method 2
The contact formed between the surface of the glass intermediate and the forming roller can be referred to as a forming contact
Data Source
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AI summary
The invention relates to a method for producing a glass product, in particular rotationally symmetrical, such as a glass syringe, a glass carpule, a glass vial or a glass ampoule, wherein the method comprises the steps of rotating a glass intermediate, in particular a glass tube, at a receiving rotational speed about a receiving rotational axis, rotating at least one forming roller at a roller rotational speed about a roller rotational axis, and bringing the at least one forming roller and the glass intermediate into a forming rolling contact for shaping, from which the receiving rotational axis is spaced in the radial direction by an intermediate radius and from which the roller rotational axis is spaced in the radial direction by a roller radius, wherein the ratio of roller rotational speed to receiving rotational speed is controlled during the method as a function of the ratio of intermediate radius to roller radius.