Reinforcing Bar Butt Welding to Eliminate Window Frame Scrap

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Solution Overview

Problem

The existing manufacturing processes for reinforcing bars for window/door frames result in significant waste due to residual bars that are too short to be used, leading to interruptions in production and increased costs.

Innovation Solution

A process and plant that utilize resistance butt welding to join residual bars with new bars, eliminating waste and allowing continuous production of reinforcing bars.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If metal bars are cut to obtain reinforcing bars of specific length, then the required reinforcing bars are produced, but residual bars too short to be used are discarded causing waste

Engineering Contradiction:
Improvelength precision of reinforcing barsVSAvoidmetal material waste
Core Design Contradiction:
Manufacturing precisionVSLoss of substance

Solution Approach 1:

The patent recovers residual bars that would normally be discarded by welding them to new metal bars. The residual bar from one cutting operation is welded to the beginning of a new metal bar, creating an extended bar that can be cut to produce additional reinforcing bars. This transforms waste material into useful product, eliminating the need to discard residual portions.

Inventive Principle:
Principle #34Discarding and recovering

Solution Approach 2:

The patent converts the harmful effect of residual bars (which are too short to be useful and must be discarded) into a beneficial resource. By welding residual bars to new bars, the previously wasted material becomes the foundation for producing additional reinforcing bars, thereby converting a disadvantage into an advantage.

Inventive Principle:
Principle #22Blessing in disguise (Convert harm into benefit)

2Ease of operation

If residual bars are removed from the production line after cutting, then space is made for new bars, but production operations are interrupted and timeline is lengthened

Engineering Contradiction:
Improveproduction line operation continuityVSAvoidproduction interruption time
Core Design Contradiction:
Ease of operationVSLoss of time

Solution Approach 1:

The patent enables continuous production by eliminating the need to remove residual bars from the line. The residual bar is welded to a new bar in place, creating a continuous extended bar that remains on the production line. This allows cutting operations to proceed without interruption, as the welded assembly can be positioned and cut along with other bars, maintaining continuous productive action.

Inventive Principle:
Principle #20Continuity of useful action

Solution Approach 2:

The patent merges the residual bar with a new metal bar through welding, creating a single extended bar assembly. This combination allows the residual material to remain part of the productive inventory on the production line rather than being removed, enabling seamless continuation of cutting operations without downtime for bar replacement.

Inventive Principle:
Principle #5Merging (Combining)

3Reliability

If excess metal bars are purchased to ensure required production quantity, then production requirements are met, but production costs increase

Engineering Contradiction:
Improveproduction quantity assuranceVSAvoidtotal metal material consumption
Core Design Contradiction:
ReliabilityVSQuantity of substance

Solution Approach 1:

The patent recovers material that would otherwise be wasted by welding residual bars to new bars. This recovery process means that fewer new metal bars need to be purchased to achieve the required production quantity, as the residual portions contribute to the final product count. This reduces total material consumption while ensuring production requirements are met.

Inventive Principle:
Principle #34Discarding and recovering

Solution Approach 2:

The production system serves itself by utilizing its own residual bars as raw material for additional production. Instead of needing to purchase excess new bars to compensate for waste, the system recycles its own byproducts (residual bars) into useful products, thereby reducing external material requirements and ensuring production quantity with fewer purchased bars.

Inventive Principle:
Principle #25Self-service

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 solution prevents the formation of waste products, reduces interruptions in the manufacturing process, and optimizes operational timelines and costs.

Implementation Method 1

resistance butt welding to join residual bars with new bars

Methodology Applied
Scientific EffectJoule heating: Joule Heating

Implementation Method 2

resistance welding means (11) adapted to butt weld the residual bar (7) and the second bar (3) by means of a current flow through the ending surfaces (4, 5) facing each other

Methodology Applied
Scientific EffectResistance welding: Welding

Data Source

PatentUS20250178115A1Process and plant for the manufacture of reinforcing bars for profiled elements for window/door frames
Publication Date: 2025.06.05 GRAF SYNERGY
  • US20250178115A1 patent drawing
  • US20250178115A1 patent drawing
  • US20250178115A1 patent drawing

AI summary

The process comprises the following phases:providing one first bar (2) and one second bar (3) made of one metallic material and extending along relevant longitudinal directions, each provided with a first ending surface (4) and with a second ending surface (5);cutting the first bar (2) to obtain one reinforcing bar (100) insertable in a relevant profiled element for window/door frames and a residual bar (7) provided with the second ending surface (5);positioning the second bar (3) aligned with the residual bar (7) with respect to a direction of forward movement (D) substantially parallel to said longitudinal directions, with the first ending surface (4) of the second bar (3) facing the second ending surface (5) of the residual bar (7);resistance butt welding of the second bar (3) and of the residual bar (7) carried out by means of current flow through the ending surfaces (4, 5) facing each other to obtain a welded bar (10).