Die Attach Solder Preform Cutter With Adjustable Stop
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Solution Overview
Problem
Current die attach solder preform fabrication requires large machinery and specialized tools, making it costly and environmentally impactful for custom sizes, especially in R&D environments where small quantities are needed, and brittle solders like gold/tin alloys are difficult to cut accurately.
Innovation Solution
A compact, portable cutter with a base, adjustable stop, linear scale, and lateral guides allows for precise cleaving of die attach solder preform material using a removable cutting blade and hammer, enabling custom sizes without specialized machinery or chemicals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If large machinery and specialized tools are used to manufacture stamp and die sets for cutting solder preforms, then manufacturing precision and productivity are improved, but device complexity, cost, and environmental impact increase
Solution Approach 1:
The invention divides the cutting tool into separable components: a reusable base with guide blocks and a disposable cutting blade. This segmentation allows the complex precision elements (guide blocks with slots) to be permanently installed in the base, while the simple cutting blade can be easily replaced. This resolves the contradiction by concentrating complexity only where necessary for precision (in the base structure) while keeping the cutting element simple and replaceable.
Solution Approach 2:
The cutting blade is designed as a disposable, inexpensive component that can be easily replaced when worn. Instead of investing in expensive, complex machinery to maintain blade precision, the solution is to use cheap, simple blades that are discarded after limited use. This eliminates the need for complex blade maintenance systems while maintaining cutting precision throughout the blade's service life.
2Manufacturing precision
If custom stamp and die sets are manufactured for specific preform sizes, then manufacturing precision is improved, but loss of time and productivity are worsened due to set-up charges and lead time
Solution Approach 1:
The invention makes the cutting system dynamic and adaptable by allowing easy replacement of cutting blades and adjustment of the base configuration for different preform sizes. Instead of manufacturing entirely new stamp and die sets for each size, the system can be quickly reconfigured by changing blades or adjusting the base, enabling rapid response to different production requirements without lengthy lead times.
Solution Approach 2:
The base unit is designed as a universal platform that can accommodate different cutting blades and configurations for various preform sizes. This multi-functionality eliminates the need for dedicated machinery for each size, allowing the same base to serve multiple purposes by simply changing the cutting blade or adjusting parameters, thus reducing lead time for setup.
3Ease of operation
If traditional cutting methods are used on brittle solders, then ease of operation is maintained, but manufacturing precision deteriorates as the material shatters rather than being cut to desired size
Solution Approach 1:
The invention introduces guide blocks with precision slots as an intermediary between the operator and the brittle solder material. These guide blocks constrain the cutting blade to move along precise paths, ensuring that even simple cutting operations produce accurate preform dimensions. The intermediary structure translates simple blade motion into precise cutting action, preventing shattering while maintaining operational simplicity.
Solution Approach 2:
The invention replaces complex mechanical cutting systems with a simpler system that uses the brittle nature of the solder to advantage. Instead of relying on complex blade mechanisms to cut through the material, the system uses a simple blade that leverages the material's own brittleness to achieve clean breaks when guided properly through the constrained motion paths provided by the guide blocks.
Data Source
AI summary
A cutter to cut die attach solder preform material is disclosed. It is formed of: a base; a pair of raised blocks spaced apart on the base with each having a slot sized to accommodate a cutting blade configured to cleave the material to be cut, constrain the cutting blade to vertical movement, and maintain the squareness of the cutting blade with respect to the base for cutting material; an adjustable stop positioned forward of the cutting blade which is configured to be moved so as to set the length of the material to be cut by the cutting blade; and a linear scale positioned proximate to the adjustable stop which enables a measured length of the material to be cut. Methods of using the aforementioned cutter are also disclosed.