Mechanical assembly is the critical process of joining individual components into a functional unit. It lies at the core of every manufactured product, from consumer goods to complex industrial machinery. This blog post explores the world of mechanical assembly, covering its definition, main types, and the detailed process involved.
What Is Mechanical Assembly?
Mechanical assembly is mainly the work of putting together components to form a final unit. It often takes place on an assembly line. Besides that, mechanical assembly also means an assembled product or a part of a product that is made in this way.
In short, mechanical assembly means putting parts together to create a complete product that can perform a function.
Assembly is often the ultimate step in product manufacturing after making discrete parts. It plays an important role in enhancing product improvement techniques and manufacturing strategy.
Assemblies are essential physical products in both technical and commercial ways. A company can rely on an assembly-driven product realization process to enhance its proficiency in production and improve its prospects.
What are The Different Types of Mechanical Assemblies
There are three main types of mechanical assembly, including threaded fasteners, non-threaded fasteners, and thermal joining and welding.
Threaded Fasteners
Threaded fasteners are discrete devices that utilize a helical thread to join two components together. This type of mechanical assembly supports both assembly and disassembly of parts. They aim to make these processes more efficient and minimize damage.
One of the most common threaded fasteners is a bolt. It is a cylindrical rod with a head at one end and threads at the other. A bolt works closely with a nut which is an internally threaded part and tightens onto the bolt. Bolts and nuts come in different grades denoting strength for various loads and environmental conditions.
Key types of threaded fasteners include:
- Screws: Externally threaded fasteners for joining into threaded holes.
- Bolts: Externally threaded rods inserted through holes and secured with nuts.
- Nuts: Internally threaded parts that match bolt threads for tightening assemblies.
Threaded fasteners are invaluable because they permit easy disassembly, a crucial capability for maintenance, repair, and reconfiguration across many industries. Their versatility in enabling secure yet reversible joining makes threaded fasteners the most important category of mechanical fasteners used today.
Non-Threaded Fasteners
Non-threaded fastening uses simple yet versatile fasteners like pins, washers, retaining rings, dowels, keyrings, rivets, and adhesives to make connections with minimal effort. With this method, you do not have to worry about threads or complex fixtures—all you need are pre-drilled holes to attach and create durable bonds that will stand the test of time.
Examples include rivets and eyelets. Non-threaded fasteners provide a permanent or semi-permanent connection between parts.
- Pins offer easy and reliable fastening mechanisms, working as locking devices, locating elements, pivots, and bearing faces. They can come in straight or tapered styles and with or without a head, to align with different assemblies
- Washers are a secure seating point for bolts and screws, providing assemblies with reliable strength and stability for them to perform well. Washers distribute loads and stresses over large surfaces and facilitate applications subject to vibration and shock.
- Sheet metal riveting is famous for its lasting and secure fastening. This method utilizes an automatic pneumatic hammer to insert rivets, which are bolt-like fasteners, through sheet metal in a way that deforms and permanently fastens components.
- Adhesive bonding is another effective way of permanently joining two sheet metal surfaces that utilizes liquid adhesives and tapes, effectively eliminating the need for any additional fastening components. There is no need for penetration or high temperatures to use adhesive bonding and it can be applied on diverse materials.
Thermal Joining and Welding
Thermal joining and welding utilize high heat to permanently fuse separate metal parts together. While similar in using heat, they have distinct differences. Welding melts the base metals, and then solidifies into one piece. Meanwhile, instead of melting the base metals, soldering and brazing melt a filler metal into the joint to join metals.
These processes create very strong, permanent bonds ideal for applications requiring maximum strength and temperature resistance. The typical mechanical assembly examples for these processes are soldering for electrical connections, brazing for joining dissimilar metals and welding for heavy structural assemblies.
Thermal processes help eliminate the use of separate fasteners while enabling the joining of complex shapes and tight spaces. However, they require specialized equipment, skills, and safety precautions compared to mechanical fastening.
The Mechanical Assembly Process
Mechanical assembly involves a systematic approach with multiple steps to ensure proper fit, alignment, and integrity of the assembled product. The typical mechanical assembly process comprises the following key stages:
STEP #1: Cleaning and preparation of the components
First and foremost, all individual parts must be thoroughly cleaned and inspected to remove contaminants, burrs, and defects. Just then, they could accommodate assembly.
At the same time, surfaces must be treated with lubricants, coatings, or sealants. This step will create smooth mating and prevent corrosion or wear.
STEP #2: Ensuring Proper Alignment and Fit
With the help of precision tools, jigs, fixtures, or locating pins, carefully align and position relative components to each other according to the design specifications. Proper orientation and fit are critical at this stage to ensure smooth assembly and optimal functionality.
STEP #3: Alignment and preliminary fastening
Once aligned, temporary fasteners like pins, clamps, or screws are used to securely hold the components in their correct positions during the subsequent assembly steps. This preliminary fastening prevents misalignment and simplifies handling.
STEP #4: Tightening and checking torques
Once the components are in place, employ permanent faltering methods, including bolting, riveting, welding, or adhesive bonding to create strong joints between the parts. After that, we should use calibrated tools to ensure fasteners are installed and tightened to torque values.
STEP #5: Functional test
The assembled unit must undergo a thorough inspection process with visual examination, dimensional checks, non-destructive testing, or functional tests. The proper alignments, and correct operation under simulated conditions.
STEP #6: Verifying Assembly Integrity
Based on the inspection results, any necessary adjustments are made to correct issues like misalignments, clearances, or interference fits. The assembly may also undergo additional finishing processes like deburring, cleaning, or applying protective coatings or lubricants.
If you are looking for a complete and reliable mechanical assembly service, Fischer ASIA provides comprehensive all-in-one solutions extending beyond metal stamping parts and molds. Our component assembly services encompass fabrication and assembly of entire components, welding operations, and manual assembly to convert multiple parts into a finished product.
Our complete service scope covers product development support, deep-drawing and metal stamping parts production, supplier management for purchased parts, assembly of components into the final product, and packaging design and management. With our integrated capabilities, Fischer ASIA streamlines the entire manufacturing process, delivering high-quality assembled components tailored to customer requirements.
Let Fischer ASIA Be Your Partner!
By understanding what mechanical assembly is, the different types of it, and how it works in the manufacturing industry, manufacturers are more likely to deliver the best products that meet high standards in the market.
At Fischer ASIA, we understand how important component assembly is. That’s why we adhere to LEAN principles to optimize productivity and maintain the highest quality standards. And our zero-detect policy ensures every stage of the assembly process is meticulously monitored, resulting in excellent assembled components that can meet and exceed the expected quality requirements.
Contact us today to discuss your project requirements with our world-class component assembly solutions!
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