Producing High Quality Rivets with CNC Machines(hard ness Adolph)
- source:ZIEG CNC Machining
CNC machining enables the mass production of rivets with a high degree of dimensional accuracy, consistency and repeatability. CNC machines work from computer-coded instructions to control the movements of machine tools very precisely. This precision is essential for producing rivets to tight tolerances. Even the smallest defects in a rivet's dimensions or surface finish can lead to joint failures or accelerated wear.
Raw Material Selection
The creation of quality rivets starts with choosing the optimal raw materials. The most commonly used metals for rivets include aluminum, steel, titanium, brass, copper and nickel-based alloys. The choice depends on factors like strength requirements, corrosion resistance, cost and weight considerations.
CNC machining gives manufacturers the flexibility to use stock metals in various forms including rods, bars, sheets, forgings and castings. This allows selecting a starting material that offers the best combination of machinability, mechanical properties and expense.
CNC Milling of Rivet Blanks
The first step in rivet manufacturing is to machine the rivet blanks - i.e. the basic cylindrical shape from which the final rivet will be fabricated. CNC milling centers equipped with high speed spindles are ideally suited for rapidly and accurately facing off the ends of the stock and center drilling it.
Next, the blanks are loaded into precision CNC lathes. Highly rigid CNC lathes with driven tooling and live tooling capabilities can completely machine rivet blanks in a single setup. The blanks are machined down to the required diameter and head profiles are formed on one or both ends.
Automated feeds allow the lathe to run unmanned for extended periods to produce large batches. The CNC system enables precisely controlling critical dimensions like shaft diameter, head shape, height and angle. It also facilitates consistently achieving mandatoryconcentricity between shaft and heads.
After initial milling and turning, secondary operations may be performed to impart additional features or enhance certain properties.
Some examples are:
- Threading - threading the rivet shank allows screwing it into pre-tapped holes for a solid, vibration-resistant attachment. CNC lathes equipped with threading tools can accurately machine different thread types, pitches and diameters.
- Grooving - grooves on the shank improve grip and provide better shear strength. Precision CNC grooving is preferable over rolling or forging grooves which tend to distort dimensions.
- Heat treatment - this includes processes like quenching and tempering which alter the microstructure of the rivet material to attain higher hardness and strength. CNC automation allows executing heat treatment cycles with tight tolerances.
- Coatings - coatings like zinc improve corrosion resistance or provide lubricity for driving the rivet into place. CNC-programmed plating equipment deposits coatings uniformly to microscopic thickness.
Stringent inspection procedures are implemented to verify rivets meet all quality metrics before approving production batches. CNC-controlled coordinate measuring machines accurately check critical dimensions and forms. Automated vision inspection systems can detect microscopic surface and finish defects.
This phased quality control enables rapid feedback to dial in processes for optimum performance. It also ensures only rivets conforming to specifications get shipped out.
Consistent Quality Output
Sophisticated CNC machines, rigid fixturing, sharp tooling and advanced sensing are key to achieving repeatable precision during high volume production. Programmed tool offsets compensate for predictable tool wear. Minimum quantity lubrication reduces variability from heat build-up and deformation.
Digitally integrated processes maximize equipment uptime and minimize scrapped parts. All these factors come together to enable the consistent output of top quality rivets at the pace and volumes demanded by modern industry.
In summary, computerized numerical control systems enable manufacturers to produce rivets to the highest quality standards in the most efficient and cost-effective manner. Precision CNC machining is indispensable for fabricating rivets that consistently meet critical application requirements across diverse industries. With rivet quality playing such a pivotal role in product durability and safety, CNC technology will continue to be the go-to choice for manufacturers worldwide. CNC Milling CNC Machining