Thread Rolling Device with Eccentric Roller for Synchronized Feeding
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Solution Overview
Problem
Existing thread rolling devices face limitations in synchronized feeding and removal of workpieces, particularly with centrally mounted rollers that do not perform a wobbling stroke, leading to inefficiencies in production output and wear on locking mechanisms.
Innovation Solution
A method and device where one roller performs a lifting movement to open the roll gap, allowing synchronized feeding and removal through a rotating parts basket that ensures the workpiece is fed into the gap during opening and removed during closing, with the opposite roller performing an eccentric stroke for forming, enabling high production output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If centrally mounted rollers are used without wobbling stroke, then the device structure is simple, but the productivity is limited due to inability to synchronize feeding and removal at high speed
Solution Approach 1:
The patent applies the dynamics principle by transforming the stationary roller mounting into a dynamic wobbling motion. The rollers are mounted on an oscillating mechanism that performs a wobbling stroke during the rolling process, enabling the roll gap to open and close cyclically. This dynamic motion allows synchronized feeding and removal of workpieces at high speed, thereby significantly improving productivity while maintaining a relatively simple device structure.
2Productivity
If linear lifting movement with carriage is used, then the roll gap can be opened for feeding, but the production output is limited due to hydraulic drive constraints
Solution Approach 1:
The patent applies periodic action by implementing a cyclic wobbling stroke of the rollers instead of continuous linear lifting movement. The oscillating mechanism creates periodic opening and closing of the roll gap, which synchronizes with the periodic feeding and removal of workpieces. This periodic motion enables high-speed operation without the constraints of hydraulic drive systems, significantly improving both speed and productivity.
3Ease of operation
If piecemeal feeding of rolling stock is used, then synchronization problems occur during feeding and removal, but continuous feeding is not feasible with central roller mounting
Solution Approach 1:
The dynamic wobbling stroke of the rollers creates a cyclic pattern of roll gap opening and closing that naturally synchronizes with the piecemeal feeding and removal of workpieces. During the outward stroke, the roll gap opens for feeding; during the inward stroke, the roll gap closes for rolling and opens for removal. This dynamic synchronization eliminates operational problems while maintaining high productivity.
4Reliability
If locking devices are used to fix rollers during rolling, then the rolling process is stable, but the device is susceptible to wear and requires high forces
Solution Approach 1:
The patent applies inversion by reversing the conventional approach: instead of fixing the rollers and moving the workpiece, the rollers themselves perform the wobbling motion while the workpiece remains relatively stationary on the oscillating mechanism. This inversion eliminates the need for locking devices and high forces, while maintaining rolling process stability through the controlled cyclic motion of the rollers.
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 allows for precise and efficient thread rolling of various materials with high production output, such as 400 pieces per minute, by ensuring the roll gap is cyclically opened and closed for synchronized feeding and removal.
Implementation Method 1
The invention provides a method and device for thread rolling with rolling rolls for piecewise rolling stock with a rolling stock to be formed, which is fed piecewise into a roll gap formed between oppositely positioned rolling rolls driven in the same direction of rotation in a forming process, wherein the rolling stock is shaped on the outer circumference, wherein one rolling roll is mounted centrally and is driven in rotation and a feed device with a parts basket is arranged coaxially on the axis of rotation, which feeds the rolled piece by piece into the roll gap in a synchronized manner and removes it from there again, wherein the opposite rolling roll performs an eccentric stroke with its outer circumference in the direction of the outer circumference of the centrally driven and rotating rolling roll, wherein during a full revolution of the rolling roll, which is in space between the outer circumference of the rolling roll and the outer circumference of the opposite rolling roll, a roll gap forms, which opens and closes cyclically
Implementation Method 2
the opposite rolling roll performs an eccentric stroke with its outer circumference in the direction of the outer circumference of the centrally driven and rotating rolling roll
Data Source
Figure 1
Figure 2
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AI summary
A method for rolling threads on workpieces (26) by means of opposing and co-rotationally driven rolling rolls (3, 13) in a forming process, comprising a rolling gap (43), which forms between the rolling rolls (3, 13) and in which the workpiece (26) that is intended to undergo the forming operation is provided on its outer circumference with a thread or a thread-like profile by undergoing forming by a rolling thread (17, 27) on the rolls, wherein, in a first method step, at least one rolling roll (3) performs a linear movement in order to open the rolling gap (43), and wherein, in a second method step, the rolled stock (26) that is intended to undergo the forming operation is transported into this opened rolling gap (43), wherein, in a third method step, the rolling gap (43) narrows, and so the rolling thread (17, 27) of the mutually opposing rolling rolls (3, 13) lies against the outer circumference of the rolled stock (26) with a forming effect, and wherein, in the next method step, the rolling gap (43) is opened again and the rolled stock (26) on which rolling has been completed is transported out of the rolling gap (43). The invention also relates to a device for rolling threads.