La lavorazione CNC funziona con due ampie famiglie di materiali: metalli e plastiche. La scelta del materiale determina la forza, peso, resistenza alla corrosione, lavorabilità, finitura superficiale, e costo. The right choice always depends on the part’s loads, ambiente, and tolerances—never on a single property. This guide covers the common metals and plastics, how to choose, and when each one earns its cost.
How To Choose A CNC Machining Material
Start by evaluating these five key factors:
- Service conditions.Confirm temperature, sostanze chimiche, umidità, UV, and food or medical contact.
- Proprietà meccaniche.Define required strength, durezza, rigidità, e resistenza all'impatto.
- Lavorabilità.Estimate how fast and cleanly the material cuts.
- Finitura superficiale.Decide on as-machined roughness, anodizzazione, placcatura, o rivestimento.
- Costo.Compare raw material price, Tempo del ciclo, e usura degli utensili.
Material Grade And Condition Matter
The alloy name alone is not always enough when you specify a CNC machining material. Temperare, Trattamento termico, durezza, and material condition can significantly affect strength, lavorabilità, stabilità dimensionale, e costo.
- Alluminio 6061 is not the same as 6061-T6. The “-T6” temper means the material was solution heat-treated and artificially aged, which changes both strength and machinability.
- Acciaio inossidabile 17-4 PH is not a generic stainless. Its strength and hardness change with the aging condition, such as H900 versus H1150.
- 4140 steel changes with heat treatment. Ricotto 4140 machines easily. Temprato 4140 is stronger but slower and more expensive to cut.
Specify the full grade, temper, and condition on your drawing. That one line removes ambiguity in quoting, lavorazione, e ispezione, and it lets the shop match the correct material certificate.
CNC Machining Metals
Metals dominate CNC work because they deliver strength, tolleranze strette, and repeatable finishes.
| Materiale | Gradi comuni | Vantaggi principali | Applicazioni tipiche |
| Alluminio | 6061-T6, 7075-T6 | Leggero, lavorabile, resistente alla corrosione | Aerospaziale, elettronica, settore automobilistico |
| Acciaio | 1018, 4140, 4340, acciaio per utensili | Molta forza, hardenable, difficile | Alberi, utensileria, parti strutturali |
| Acciaio inossidabile | 303, 304, 316, 17-4 PH | Resistente alla corrosione, igienico, forte | Medico, cibo, marino |
| Titanio | Grado 5 (Ti-6Al-4V) | Eccellente rapporto resistenza/peso, biocompatibile | Aerospaziale, medico |
| Rame | C110 | Eccellente conduttività | Componenti elettrici |
| Ottone | C360 | Free-machining, conduttivo | Raccordi, connettori |
| Bronzo | C932 | Resistente all'usura, bassa frizione | Boccole, cuscinetti |
| Magnesio | AZ31B | Very low density and excellent strength-to-weight potential | Lightweight housings |
| Zinco | gli oneri 3 | Basso costo, dimensionalmente stabile | Piccole parti |
| Ghisa | Grigio, duttile | Vibration damping, resistente all'usura | Basi macchina, utensileria |
6061-T6 Alluminio is one of the most widely used CNC machining materials for general-purpose structural and mechanical parts. Utilizzo 7075 alluminio when you need higher strength. Scegliere 304 O 316 acciaio inossidabile for corrosion and hygiene. Scegliere titanio when its strength-to-weight ratio, resistenza alla corrosione, biocompatibilità, or temperature performance justifies the higher material and machining cost. Acciaio legato E acciaio per utensili suit high-strength and wear applications.
Lavorazione CNC della plastica
Plastics are chosen for light weight, isolamento elettrico, resistenza chimica, or lower cost.
| Plastica | Why Engineers Choose It |
| addominali | Difficile, basso costo, facile da lavorare |
| Acrilico (PMMA) | Chiaro, rigido, polishes well |
| Nylon (PAPÀ) | Forte, resistente all'usura |
| Delrin / Acetale (POM) | Rigido, bassa frizione, eccellente macchinabilità |
| SBIRCIARE | Elevata resistenza e resistenza al calore |
| PTFE | Bassa frizione, resistenza chimica, suitable for many food-contact applications |
| Policarbonato (computer) | Difficile, trasparente, resistente all'impatto |
| HDPE / UHMW-PE | Bassa frizione, resistente agli agenti chimici |
| PPS | High heat and chemical resistance |
| Ultem (PEI) | Flame-resistant, alta resistenza |
| Torlon (PAI) | Very high strength at temperature |
Delrin E nylon cover most general-purpose plastic parts. Utilizzo SBIRCIARE O Ultem for high-temperature or medical work. PTFE E HDPE suit chemical and food-contact service. Acrilico gives you transparent, polished parts.
Quick CNC Material Selection Guide
| If you need… | Consider… |
| Low cost and easy machining | 6061 alluminio, ottone, Delrin |
| Elevato rapporto resistenza/peso | 7075 alluminio, titanio |
| Resistenza alla corrosione | 316 acciaio inossidabile, titanio |
| Conduttività elettrica | Rame, ottone, alluminio |
| Resistenza ad alta temperatura | SBIRCIARE, PEI, PPS |
| Bassa frizione | POM, PTFE, UHMW-PE |
| Resistenza all'usura | Tool steel, POM, UHMW-PE |
| Trasparenza | Acrilico, policarbonato |
| Medical applications | 316L stainless steel, titanio, SBIRCIARE |
CNC Machining Materials By Application
| Applicazione | Material To Consider | Perché |
| Aerospaziale | 7075 alluminio, titanio, SBIRCIARE, Ultem | Strength-to-weight and heat resistance |
| Medico | 316L stainless, titanio, SBIRCIARE | Biocompatibility and cleanability |
| Food Contact | 304/316 inossidabile, Delrin, PTFE, HDPE | Cleanable, non-toxic surfaces |
| Elettrico | Rame, ottone, alluminio | Conduttività |
| Alta temperatura | Titanio, acciaio per utensili, SBIRCIARE, Torlon | Heat resistance |
| Chemical Service | 316 inossidabile, PTFE, HDPE, PPS | Resistenza chimica |
| Prototipazione | 6061 alluminio, addominali, Delrin | Fast and low cost |
| Wear Parts | Hardened tool steel, Delrin, UHMW-PE | Resistenza all'usura |
Machinability And Surface Finish
Machinability describes how easily a material cuts. It drives cycle time, usura degli utensili, fine, e costo.
- Free-machining materials.Brass C360, 303 inossidabile, 6061 alluminio, and Delrin cut fast and finish well.
- Difficult materials.Titanio, acciaio temprato, and superalloys need slow feeds and more tool wear.
- Metal finishes.Aluminum can be anodized; stainless can be passivated or electropolished; steel can be plated.
- Plastic finishes.Plastics usually need polishing or vapor polishing to remove tool marks.
Learn more in our guides on machinability of materials E surface finishes for CNC machining.
What CNC Machining Materials Cost
Material cost comes from raw material price, grado, disponibilità, and machining waste. Machinability then adds labor and tooling cost.
- Aluminum and free-machining brass are usually the most cost-effective metals.
- Stainless steel costs more to buy and cuts slower than aluminum.
- Titanium costs more again, in both material and cycle time.
- SBIRCIARE, Torlon, and Ultem cost more than ABS or Delrin and machine more slowly.
Exact prices depend on your geometry, grado, fine, and volume. A quote gives you the real number.
DFM Tips For Choosing A Machinable Material
Select the material before you finalize thin walls, discussioni, e tolleranze. Each material machines differently.
- Specify the grade and standard. Do not write only “aluminum” or “stainless steel”.
- Avoid deep pockets and thin walls in soft, gummy plastics.
- Match tight tolerances to machinability. Tight tolerances in titanium cost more.
- Decide on surface finish or coating before quoting. They change the material choice.
- Confirm temperature and chemical exposure before you pick a plastic.
When Not To Use Certain Materials
Some materials machine easily but fail in service. Others perform well but cost too much to machine.
- 6061 aluminum struggles in strong chloride or seawater environments.
- 304 stainless can gall and work-harden. Scegliere 303 stainless steel when machinability is a higher priority; scegliere 304 O 316 when corrosion resistance is more important.
- Titanium is expensive and slow to machine. Use it only when weight or biocompatibility justifies it.
- PTFE and UHMW creep under load and are hard to hold to tight tolerances.
- Acrylic is brittle and cracks at sharp corners.
- Magnesium swarf is flammable and needs controlled machining.
- Plain carbon steel rusts. It needs coating or plating unless hardened or passivated.
Domande frequenti
Quali materiali possono essere lavorati a CNC?
Metals such as aluminum, acciaio, acciaio inossidabile, titanio, rame, ottone, e magnesio, plus plastics such as ABS, acrilico, nylon, Delrin, SBIRCIARE, and PTFE.
What is the best material for CNC machining?
It depends on the part. For most general-purpose parts, 6061-T6 aluminum is a strong default. Match the material to the load, ambiente, e finire.
What is the most common CNC machining material?
6061-T6 Alluminio. Unisce la forza, resistenza alla corrosione, and fast machinability.
What is the easiest material to CNC machine?
Brass C360 and free-machining aluminum among metals. Delrin or acetal among plastics.
What is the strongest CNC machining material?
There is no single strongest CNC machining material. High-strength alloy steels, tool steels, and titanium alloys are commonly selected for demanding metal applications, while PEEK and Torlon are options for high-performance plastic parts. The right choice depends on tensile strength, durezza, temperatura, Indossare, and load requirements.
Is aluminum cheaper to machine than stainless steel?
Generalmente, SÌ. Aluminum machines faster and wears tools less, so it costs less per part for most geometries.
Can hardened steel be CNC machined?
SÌ. It needs rigid machines, carbide tooling, and slower feeds.
Do you provide material certificates?
SÌ. Request a certificate for your specified grade when you Contattaci.
Get A Material Recommendation For Your Part
Lavoriamo 100+ metals and plastics under an ISO 9001:2015 quality system. Our shop covers 3-axis, 4-asse, and 5-axis milling, girando, ed EDM. We finish prototypes in 1–3 days and return quotes in 24 ore. Achievable tolerances depend on geometry, materiale, macchina, and inspection method.
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