Custom sheet metal fabrication is a process that involves cutting, shaping, and joining metal sheets to create functional parts that are tailored to specific requirements. It can be used for early prototypes and repeat production when standard parts are not available to meet a design requirement. The process involves using digital manufacturing data and practical fabrication techniques to produce fabricated parts with precise dimensions, shapes, and surface properties. To the engineer and product developer, knowledge of these capabilities is crucial to the selection of the appropriate fabrication technique, material, and finishing process for a specific application.
1. From Digital Drawings to Fabricated Components
The first step in sheet metal fabrication is creating a digital design of the part. This includes specifying the part’s geometry, dimensions, bends, holes, cutouts, etc. This information is then checked by Engineers prior to production to decide if the proposed geometry will be best served by the selected fabrication processes.
The design stage can also reveal potential problems, like bends that are too tight, hole locations, or other attributes that may make forming difficult. By taking these considerations into account before manufacturing, unnecessary revisions can be avoided, and a smoother transition from CAD data to physical components can be achieved.
2. Cutting Methods Shape the Foundation
Typically, cutting is one of the initial fabrication processes, as it defines the general shape of the part. Each technology offers a varying degree of flexibility, speed, and geometric capacity.
Laser cutting is especially suitable for creating fine contours, openings, slots, etc. directly from digital designs. The method is able to process a wide variety of sheet geometries and has a relatively small cutting path. When appropriate, punching is also an effective method, particularly when multiple holes or standard features need to be punched on a large number of parts.
3. Forming Adds Three-Dimensional Geometry
A flat sheet is converted to a useful part by controlled forming. Bending alters the angle of the sheet without removing significant amounts of material, and can be used by manufacturers to produce brackets, enclosures, panels, frames, and structural materials.
These bends are often made on press brakes with the use of controlled force and special tooling. Factors that can affect the result include bend radius, material thickness, grain direction, tooling, and bend sequence. In such cases, therefore, proper process planning is important when multiple bends need to be precisely aligned over the same part.
4. A Broader Fabrication Workflow
A full custom fabrication project is a process that generally requires more than one operation. Multiple processes can be combined to convert raw sheet material into a finished part. 3ERP integrates various sheet metal processes; design can flow through the required processes instead of being forced into a single process for each geometry.
Key fabrication capabilities include:
- Laser cutting: Creates precise external profiles, openings, slots, and intricate contours.
- Bending: Forms controlled angles and three-dimensional shapes from flat sheets.
- Stamping: Produces repeatable features efficiently when tooling-based forming is appropriate.
- Spinning: Forms rotational sheet components around a defined axis.
- Punching: Creates holes and other repeatable sheet features using dedicated tooling.
- Welding: Joins separately fabricated components into larger assemblies or structures.
The appropriate combination is dependent on geometry, material, thickness, number, dimensional requirements, and use.
5. Material Selection Influences Fabrication Results
The first step in sheet metal performance is to use the appropriate material. Aluminium is lightweight and has some corrosion resistance, and steel is strong and has a wide range of fabrication possibilities. Stainless steel is often chosen for its corrosion resistance, durability, or specific aesthetic appeal.
The material selected also influences forming properties, cutting conditions, finishing requirements, and part performance. Hence, the proper grade should be chosen to suit the mechanical requirements and characteristics of fabrication and not on the basis of appearance alone.
6. Surface Finishing Completes the Part
Fabrication is not necessarily complete once the component is formed into its final shape. Surface finishing can enhance appearance, corrosion resistance, durability, or compatibility for subsequent assembly processes.
Fabricated parts can be treated by powder coating, anodizing, plating, brushing, polishing, or other appropriate finishes, depending on the material and specification. The material and environment where the component will be used should be considered when the treatment is selected.
7. Connecting Prototyping With Production
A major benefit of custom sheet metal fabrication is that it can be utilized throughout various phases of product development. A prototype can be used to check the physical dimensions, assembly relationships, and design changes without getting into larger quantity orders.
The same manufacturing approach can cover low-volume production and general manufacturing requirements if the geometry and process are still suitable as the design matures. This provides a practical route from design verification to production without starting out with a high volume tooling for each project.
Where suitable, rapid manufacturing processes can also enable shorter lead times, enabling the development team to test physical components earlier. 3ERP has been helping with rapid prototyping and manufacturing projects since 2010, in various production technologies such as sheet metal fabrication.
8. Quality Control and Manufacturing Readiness
Reliable sheet metal fabrication doesn’t just involve powerful equipment. Quality relies on material verification, process control, dimensional inspection, and proper testing during the production process.
An ISO 9001:2015 certified manufacturing system is a systematic approach to the management of quality processes. Inspection equipment can determine critical dimensions against engineering requirements, and design for manufacturing review can identify production concerns prior to the start of fabrication.
If a project involves more than just sheet metal, then using sheet metal fabrication and CNC machining, injection molding, 3D printing, or another manufacturing technique can help give a project a wider production strategy. By having access to multiple processes, 3ERP can assist in converting various component needs to suitable manufacturing routes.
Conclusion
Custom sheet metal fabrication is more than cutting and bending metal; it’s a versatile manufacturing discipline. Cutting, forming, joining, and finishing are the processes to create the profile, functional geometry, assemblies, and prepare surfaces for the intended environment. The type of material used and the quality control also affect the performance and uniformity of the final component.
Knowledge of the interaction of these processes enables the engineer to make informed design decisions in terms of geometric design, material, fabrication, and production requirements. Detailed CAD data can be translated into actual metal fabrication parts with a well-planned fabrication workflow, and can be used to accommodate prototypes, short runs, and changing production requirements.
Disclaimer: The information in this article is for general informational purposes only and does not constitute professional, technical, or engineering advice. Fabrication capabilities, material specifications, tolerances, certifications, and pricing vary by manufacturer and project requirements, and may change without notice. Readers should verify all technical details, quality standards, and production capabilities directly with the manufacturer before placing any order. Any mention of specific companies or services does not imply endorsement. The author and publisher disclaim any liability for decisions made based on this content.
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