Overview
CNC Machined Automotive Pistons
CNC Machined Automotive Pistons is a component or assembly that has been manufactured by machining, a process that removes material from the workpiece using cutting tools. The piston is an essential part of the internal combustion engine which is key in converting the fuel which you use to fill up your car into energy to drive the car forward.
It is a moving component that is used to transfer the force from the gas which expands in the cylinders to the crankshaft to turn the wheels.
They are needed to convert the linear motion in the cylinders to a circular motion which can power the wheels.
FRIMA’s rich experience in the automotive field has equipped us to respond to the global demands of automotive OEMs, as well as their second and third-tier suppliers, in order to establish optimal manufacturing solutions and to achieve new platform launches.
What specification of CNC Machined Automotive Pistons FRIMA can offer?
1. Size
- Threaded Holes
- >UNC & UNF threads from #2 up to 0.5 in.
- Metric threads M1.2 and above.
2. Radii
Turned outside corners will typically include a 0.005 in. chamfer.
Minimum hole size:
- Minimum on-axis and axial: 0.04 in. (1mm)
- Minimum radial: 0.08 in. (0.5mm), 0.04 in (0.5mm) for aluminum and brass
3. Grooves:
- Minimum OD groove width: 0.047 in. (1.2mm)
- Minimum OD groove width for aluminum and brass:0.019 in (0.5mm)
- Maximum OD groove depth: 0.95 in. (24.1mm)—varies with a groove width
4. CNC Machined Automotive Pistons Standards
| CNC Machining Standards (DIN ISO 2768-1(1991-06) | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tolerance class | tolerance(mm) | |||||||||||||
| Metal (ISO 2768-F) | Plastic (ISO 2768-F) | |||||||||||||
| 0.5 to 3 | Over 3 to 6 | Over 6 to 30 | Over 30 to 120 | Over 120 to 400 | Over 400 to 1000 | Over 1000 to 2000 | 0.5 to 3 | Over 3 to 6 | Over 6 to 30 | Over 30 to 120 | Over 120 to 400 | Over 400 to 1000 | Over 1000 to 2000 | |
| F | ±0.05 | ±0.05 | ±0.1 | ±0.15 | ±0.2 | ±0.3 | ±0.5 | ±0.05 | ±0.05 | ±0.1 | ±0.15 | ±0.2 | ±0.3 | ±0.5 |
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5. General Tolerances For Shape And Position
| General tolerances for shape and position (DIN ISO 2768-2(1991-04) | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tolerance class | tolerance(mm) | |||||||||||||
| Straightness and Flatness | Verticality | Symmetry | ||||||||||||
| 10 | 10 to 30 | 30 to 100 | 100 to 300 | 300 to 1000 | 1000 to 3000 | to 100 | 100 to 300 | 300 to 1000 | 1000 to 3000 | to 100 | 100 to 300 | 300 to 1000 | 1000 to 3000 | |
| H | ±0.02 | ±0.05 | ±0.1 | ±0.2 | ±0.3 | ±0.4 | ±0.2 | ±0.3 | ±0.4 | ±0.5 | ±0.5 | |||
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Materials Used for CNC Machined Automotive Pistons
Piston Material: What are Pistons Made of?
CNC Machined Automotive Pistons can be applied to various materials. A piston in the car takes in a lot of thermal and mechanical stress. It must, therefore, be made from a material that can stand up to high temperatures, pressures, mechanical impacts, and several other situations.
But the piston must also be lightweight, which means piston material should balance between mass and other qualities. The piston of engine types used in the performance is usually made of aluminum alloys.
Initially, iron was used due to its excellent resistance to wear, good thermal conductivity, and other benefits. But iron produced heavy pistons. A piston for car use should not be heavy, or it will reduce the engine’s efficiency. Aluminum was an option, but not as effective when it came to resisting wear and heat.
Technological developments led to the production of aluminum alloys with superior characteristics, though. As a result, pistons made of aluminum dominate the automotive piston market today. The modern piston of diesel engines, petrol engines,s and virtually every internal combustion engine most likely be aluminum.
Different lathes are needed for turning metal and wood. According to the types of machined part materials, certain maintenance and safety precautions may be required for the lathe.
Here are some common materials for CNC-machined automotive pistons below. If the material you required is not listed in the table, please contact us.
Surface Finish at FRIMA – Process for CNC Machined Automotive Pistons
Here is a wide selection of metal surface finishing services of your choice for the machined CNC machining automotive pistons to improve the part appearance, surface smoothness, corrosion resistance, and other characteristics.
| As machined | Description |
|---|---|
| As machined | Standard finish with a surface roughness of 1.6 μm (126 μin). |
| Smoothing | The standard smoothing surface roughness (Ra) is 0.8 μm (63 μin). |
| Painting | Spraying paint, pigment, or color to a solid surface as a colored protective layer. |
| Passivation | Remove ferrous contaminants or use a light coat of protective material to create a shell. |
| Powder Coating | A functional and decorative finish that is applied as a free-flowing, dry powder. |
| Anodizing | Type II (anodizing color or clear) or Type III (anodizing hard coat) |
| Polishing | Produce a smooth and shiny surface. |
| Black Oxide | Formed a black conversion coating on metal parts. |
| Bead Blasting | Removing surface deposits by applying fine glass beads at high pressure. |
| Abrasive Blasting/Sandblasting | Smoothing and cleaning a hard surface by forcing solid particles across that surface. |
| Electroplating/Plating | Form a thin coherent metal coating on an electrode. |
| Brushing | Polishing the metal with grit results in a unidirectional satin finish. |
| Chromate Conversion coating | Increase the corrosion resistance while maintaining conductive properties |
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