Sheet Metal Laminated Core Connection Using Plasticizer
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Solution Overview
Problem
Existing methods for connecting sheet-metal parts to form laminated cores face challenges such as high process effort, instability, and sensitivity to parameter variations due to temperature control issues during pre-gluing and curing, leading to inconsistent production and potential distortion of parts.
Innovation Solution
The introduction of a plasticizer, such as H2O, lowers the glass transition temperature of the adhesive, allowing for preliminary connection at reduced temperatures, avoiding premature curing and enabling more precise and stable final connections, with a flexible method tolerant to sheet-metal parameter changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high heating temperature is applied during punching to achieve pre-gluing, then adhesive connection is sufficient, but adhesive curing occurs prematurely and part distortion happens
Solution Approach 1:
The invention changes the temperature parameter during punching from high temperature (sufficient for curing) to moderate temperature (sufficient only for plastification), thereby preventing premature curing while maintaining adequate adhesive connection strength. This parameter change resolves the contradiction between achieving sufficient bond strength and preventing part distortion.
2Manufacturing precision
If moderate heating temperature is applied during punching to avoid distortion, then pre-gluing connection is insufficient, but adhesive curing is avoided
Solution Approach 1:
The invention changes the adhesive property parameter by adding a plasticizer, which lowers the glass transition temperature and enhances adhesive plasticity at moderate temperatures. This allows sufficient pre-gluing connection strength to be achieved at lower temperatures that prevent distortion, resolving the contradiction between connection strength and manufacturing precision.
Solution Approach 2:
The invention introduces a plasticizer as an intermediary substance that modifies the adhesive's properties, enabling it to achieve sufficient connection strength at moderate temperatures without causing premature curing. The plasticizer acts as a mediator between the moderate heating conditions and the required adhesive performance.
3Reliability
If temperature control is strict during pre-gluing to avoid curing, then process effort is high and stability is reduced, but curing can be avoided
Solution Approach 1:
The invention changes the adhesive composition by adding a plasticizer, which fundamentally alters the temperature-response characteristics of the adhesive. This creates a wider safe temperature window between plastification and curing, reducing the strictness of temperature control requirements and simplifying the overall process while maintaining reliable curing avoidance.
4Ease of operation
If plasticizer is added to lower glass transition temperature, then preliminary connection is easier at reduced temperature, but adhesive composition complexity increases
Solution Approach 1:
The invention changes the chemical composition parameter of the adhesive by incorporating a plasticizer, which lowers the glass transition temperature and enhances plasticity. This enables preliminary connection operations to be performed more easily at reduced temperatures, improving ease of operation despite the increased compositional complexity.
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 ensures secure and reproducible preliminary and final connections, maintaining precision and strength while simplifying the process, reducing energy consumption, and enhancing the method's versatility and cost-effectiveness.
Implementation Method 1
The introduction of a plasticizer, particularly of H2O, lowers the glass transition temperature of a curable polymer adhesive
Implementation Method 2
plastification of the adhesive, at least in certain regions, and joining of the sheet-metal parts to connect them by way of the plasticized adhesive
Implementation Method 3
in a subsequent step, the laminated core having the preliminarily connected sheet-metal parts is subjected to curing of the adhesive
Data Source
AI summary
The invention relates to a method for connecting sheet metal parts (4) to form a laminated core (11), wherein sheet metal parts (4) are separated, in particular punched, from a sheet metal strip (2) that has, at least in some areas, a layer having curable polymer adhesive (12), and the sheet metal parts (4) are preliminarily connected to form a laminated core (11), the preliminary connection comprising plasticizing the adhesive (12) at least in some areas and joining the sheet metal parts (4) in order to connect the sheet metal parts by means of the plasticized adhesive (12) of at least one of the sheet metal parts (4), and in a subsequent step the laminated core (11) having preliminarily connected sheet metal parts (4) is subjected to a curing of the adhesive (12). In order to create an advantageous connection between the sheet metal parts, the plasticizing of the adhesive (12) comprises the introduction of a softener (16), in particular H2O.