How to Execute CNC Machining for Electric Toy Prototypes?

4 axis cnc machining

Electric toys, with functions like movement, sound, und Licht, rely heavily on high-precision prototypes to validate design and functionality. CNC -Bearbeitung stands out as a key method for creating these prototypes, ensuring complex structures and electronic integration work seamlessly. This article breaks down the full CNC machining process for electric toy prototypes, addressing common pain points for engineers and manufacturers.

1. Vorabbau: Design & Materialauswahl

A well-planned design and suitable materials are the foundation of a successful electric toy prototype. This stage focuses on aligning functionality with machining feasibility.

1.1 Bedarfsanalyse & 3D Modellierung

Before 3D modeling, clarify core requirements to avoid rework. Then use professional software to create detailed models.

Demand Analysis Breakdown

Requirement TypeSchlüsseldetailsAuswirkungen auf die CNC -Bearbeitung
Function DefinitionConfirm functions (Z.B., gear-driven movement, LED-Leuchten, sound modules); select core components (Motoren, Batterien, controllers)Determines space reserved for components (Z.B., motor slots, battery compartments) in machining
Strukturelles DesignDesign appearance, mechanische Teile (gear sets, joint moving parts), and electronic layoutInfluences tool path planning (Z.B., avoiding undercuts in joint structures)
SicherheitsstandardsEnsure no sharp edges; design anti-reverse battery structuresRequires precise chamfering (≤0.5mm) and accurate slot dimensions during machining

3D Modellierung & Engineering Drawing Tips

  • Software -Auswahl: Verwenden Solidworks oder Und NX for 3D modeling—they support modular design, allowing decomposition of the toy into parts (Hülse, transmission structure, electronic bracket) for step-by-step machining.
  • Detail Optimization:
  • Reserve 2-3mm extra space for electronic components (Z.B., battery compartments) to accommodate assembly gaps.
  • Add anti-slip textures (Tiefe: 0.2-0.3mm) on handles and snap structures (Toleranz: ± 0,05 mm) for secure assembly.

1.2 Material Comparison for Core Components

Selecting the right material balances performance, kosten, and machining ease.

KomponententypOptional MaterialsVorteileNachteileBearbeitungsnoten
Toy ShellABS -PlastikNiedrige Kosten, Einfach zu maschine, gute AufprallfestigkeitGeringe Hitzebeständigkeit (≤80°C)Use high rotational speed (10,000-15,000 Drehzahl) Um nicht zu schmelzen
PC -KunststoffHitzebeständig (bis zu 120 ° C.), dauerhaftHöhere Kosten, prone to crackingSlow feed speed (150-200 mm/min) empfohlen
Übertragsteile (Getriebe, Wellen)Aluminiumlegierung (6061)Hohe Stärke, leichtNeeds anodization post-processingUse coolant to prevent burrs
Pom (Kunststoff für technische Plastik)Selbstschmierend, geringe ReibungLow impact resistanceNo coolant needed; finish with 800# Sandpapier
Transparent Parts (Windows, Lights)AcrylHigh light transmittance (≥92%), leicht zu polierenSpröde, prone to scratchingUse ball head cutter for smooth surfaces (Ra ≤ 0,8 μm)

2. CNC Machining Stage: Aufstellen & Execution

This stage transforms raw materials into components, requiring careful machine selection, Programmierung, and precision control.

2.1 Werkzeugmaschine & Werkzeugauswahl

Choosing the right machine and tools ensures efficiency and accuracy.

Machining NeedRecommended Machine TypeSuitable ToolsTool Size (mm)Zweck
Small Precision Parts (Shells, Getriebe)Small CNC Engraving Machine (Z.B., 3018 Pro)Flat Bottom Cutter (Rauen), Ball Head Cutter (Fertig)Φ4-8 (Rauen), Φ2-4 (Fertig)Überschüssiges Material entfernen; achieve smooth surfaces
Complex Metal Parts (Drive Shafts)Machining CenterTwist Drill, Taper CutterΦ3-6 (Bohren), Φ5-8 (Taper)Drill holes; create tapered joints

2.2 Programmierung & Toolpath Optimization

  • G-Code Programming: Verwenden Mastercam oder PowerMill to generate toolpaths. Follow a two-step strategy:
  1. Grobe Bearbeitung: Entfernen 80-90% of excess material with a flat bottom cutter—set depth of cut to 1-2mm per pass to save time.
  2. Fertig: Use a ball head cutter for surfaces (Z.B., Spielzeugschalen) to ensure no knife marks—set depth of cut to 0.1-0.2mm.
  • Parameter Setting for Common Materials:
MaterialRotational Speed (Drehzahl)Futtergeschwindigkeit (mm/min)Tiefe des Schnitts (mm)
ABS -Plastik12,000 – 16,000200 – 3001.5 – 2.0
Aluminiumlegierung (6061)8,000 – 12,000100 – 1501.0 – 1.5
Acryl15,000 – 20,000250 – 3500.8 – 1.2

2.3 Machining Precautions

  • Festsetzung & Positionierung:
  • Use double-sided adhesive for plastic sheets (prevents surface damage) or clamps for metal blocks.
  • For symmetrical parts (Z.B., toy arms), benutze die “one side and two pins” method—position pins 5-10mm from edges to ensure ±0.05mm accuracy.
  • Präzisionskontrolle:
  • Maintain tolerance of ±0.1mm for plastic parts (Z.B., Muscheln) Und ±0.05mm for metal transmission parts (Z.B., Getriebe).
  • For thin-walled structures (thickness ≤1mm), add temporary supports during machining and remove them post-processing.

3. Nachbearbeitung & Montage

Post-processing improves appearance and durability, while assembly verifies functionality.

3.1 Oberflächenbehandlung

Proper treatment enhances aesthetics and safety.

KomponenteSurface Treatment ProcessZweckParameter
Toy Shell (ABS/PC)Schleifen (80#→2000#) + Spraying Matte PaintMaschinenspuren entfernen; verhindern KratzerSand in kreisförmigen Bewegungen Sand; paint thickness: 0.1-0.2mm
Aluminum Alloy PartsUltraschallreinigung + Eloxierung (Black/Silver)Remove oil/chips; Rost verhindernAnodization layer thickness: 5-10μm
Transparent Acrylic PartsPolieren (1000#→3000# Sandpaper + Polierpaste)Improve light transmittance; remove scratchesPolish until surface is mirror-like (Ra ≤ 0.2μm)
Logos/PatternsSeidenvorführungAdd brand logos or decorative patternsInk thickness: ≤0.05mm; dry at 60°C for 30 Minuten

3.2 Electronic Integration & Montage

Follow a logical sequence to ensure components work together.

Schritt-für-Schritt-Montage (Linear Narrative)

  1. Mechanical Assembly: First install gear sets and joint moving parts—test movement smoothness (no jamming when rotated 360°).
  2. Electronic Installation: Solder motors, Batterien, and controllers to the PCB board; fix the PCB to the CNC-machined bracket (use M2 screws, Drehmoment: 0.3 N · m).
  3. Shell Encapsulation: Attach the top and bottom shells with snaps or screws—check for gaps (≤0,1 mm) to prevent dust entry.

Checkliste für Funktionstests

  • Mechanical Function: Test motor speed (Z.B., 500-1000 RPM for toy cars) and torque—adjust gear ratios if movement is too slow/fast.
  • Electronic Function: Verify LED lights (no flickering) and sound modules (clear audio)—check circuit stability by running the toy continuously for 1 Stunde (no overheating >45°C).
  • Safety Test: Inspect for sharp edges (use a feeler gauge: no protrusions >0.1mm) and test the anti-reverse battery structure (battery cannot be inserted backwards).

4. Nachbearbeitung & Optimierung

Refine the prototype based on test results to prepare for small-batch production.

4.1 Aussehen & Strukturoptimierung

  • Appearance Repair: Fill small scratches (depth ≤0.1mm) with putty; use 3D printing to patch missing parts (Z.B., broken snap structures).
  • Structural Improvement:
  • Lightweight Design: Add hollowed-out areas (Durchmesser: 3-5mm) in non-load-bearing parts (Z.B., toy body) to reduce weight by 10-15%.
  • Strength Enhancement: Add stiffeners (Breite: 1-2mm) to stressed parts (Z.B., connecting shafts) or switch from plastic to aluminum alloy if cracks appear.

4.2 Small-Batch Validation

  • Replica Production: If the prototype passes tests, verwenden silicone replica molds (vacuum pouring) zu machen 10-20 small-batch prototypes—this reduces CNC machining costs for repeated tests.
  • Iterative Improvement: Adjust the design based on user feedback (Z.B., modify gear tooth count if the toy is too noisy; increase battery compartment size for longer runtime).

Standpunkt der Yigu -Technologie

For CNC machining of electric toy prototypes, precision and safety sind nicht verhandelbar. Yigu Technology suggests prioritizing modular design in the early stage—breaking the toy into small parts simplifies machining and reduces rework. Material selection should align with use cases: ABS is ideal for low-cost, non-heat-exposed shells, while aluminum alloy works best for high-stress transmission parts. Nachbearbeitung, like acrylic polishing and aluminum anodization, not only improves aesthetics but also extends the prototype’s lifespan. Blick nach vorn, as electric toys become more intelligent (Z.B., adding sensors), CNC machining will need to handle smaller, more complex components—requiring tighter tolerances (± 0,03 mm) and advanced tooling like micro-mills.

FAQ

  1. What CNC machine is best for small electric toy prototypes (Z.B., 5-10cm size)?

Small CNC engraving machines (Z.B., 3018 Pro) sind ideal. They offer high precision (± 0,01 mm), are cost-effective, and can handle small parts like toy shells and gears without occupying much space.

  1. How to prevent plastic parts from melting during CNC machining?

Use high rotational speeds (12,000-16,000 Drehzahl für ABS) and moderate feed speeds (200-300 mm/min). Zusätzlich, use compressed air to blow away chips and cool the material—avoiding heat buildup that causes melting.

  1. Why is “one side and two pins” positioning used for symmetrical toy parts?

This method ensures consistent accuracy across multiple prototypes. The fixed “one side” acts as a reference, while the two pins prevent lateral movement during machining—critical for symmetrical parts like toy arms, where even a 0.1mm misalignment can cause assembly issues (Z.B., uneven joint movement).

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