- Fasteners & Special Functional Parts
Addressing core concerns regarding standard compliance, anti-loosening, and custom manufacturing:
Q: Can you customize non-standard special fasteners besides regular standard parts?
A:Absolutely. Beyond manufacturing standard fasteners (DIN/ANSI/GB), we have strong custom capabilities. We can intervene at the design optimization stage for special head types, threads, or functional parts with integrated electrical/sensing features.
Q: What surface treatment options do you offer for corrosion protection?
A: We provide comprehensive surface treatments, including Zinc Plating (Clear/Yellow/Black), Dacromet, Nickel Plating, Black Oxide, and PTFE (Teflon) coating. We recommend the most suitable anti-corrosion solution based on your base material (Carbon Steel, Stainless Steel, Titanium) and the end-use environment (Marine, Chemical, High Temp).
Q: How do you ensure quality stability for high-strength bolts across batches?
A:For high-strength fasteners (Grade 8.8 and above, or Aerospace grades), we implement rigorous in-process inspections and 100% Non-Destructive Testing (MT/UT) on finished products. We provide full inspection documentation, including Tensile Test Reports, Hardness Tests, and Material Test Certificates (MTRs) with every shipment.
Q: Can you handle micro-sized or extra-large dimensional fastener machining?
A:Yes. Equipped with high-precision Swiss-type lathes and multi-station cold heading machines, we can machine micro-precision fasteners smaller than M1.6. Simultaneously, we possess large CNC lathes and heat treatment furnaces capable of manufacturing extra-large heavy-duty fasteners and structural parts with diameters exceeding M100.
Q: What is the Minimum Order Quantity (MOQ) for custom non-standard fasteners?
A:Unlike traditional fastener factories that often require tens of thousands of units, our flexible production lines allow for very low MOQs. We can even start with 50 pieces for certain non-standard items, significantly reducing trial-and-error costs during the R&D phase.
- Injection Molding & Casting Parts
Addressing concerns about tooling costs, draft angles, and mass production:
Q: What is the typical Minimum Order Quantity (MOQ) for injection molding, and who bears the mold cost?
A: We support production runs from hundreds to millions of units. For new product sampling or small-batch validation, we offer “Soft Tooling” (Silicone or Low-melting alloy molds) to minimize upfront costs. For mass production, we use high-lifespan P20/H13 steel molds; the one-time mold fee is paid by the client but amortized over subsequent production runs with no additional cost.
Q: What kind of 3D drawings are required for injection molding/casting quotes?
A:Ideally, please provide 3D models in STEP, IGS, or X_T formats. If only 2D drawings are available, ensure critical dimensions and tolerances are marked. Our engineers will automatically check for draft angles, wall thickness uniformity, gate locations, and ejection points, providing free DFM (Design for Manufacturability) optimization suggestions if necessary.
Q: What precision tolerances can be achieved for plastic injection vs. metal casting?
A:Standard tolerances for plastic parts (ABS, PC, Nylon, etc.) typically range from ±0.1mm to ±0.2mm, depending on part size and material shrinkage. For metal die casting (Aluminum, Zinc Alloy), tolerances are tighter, around ±0.05mm to ±0.1mm. Sand casting or Investment casting generally has looser tolerances, usually above ±0.25mm.
Q: What common plastic/metal materials are available, and do you support overmolding or mixed materials?
A: We support most engineering plastics (Wear-resistant UHMWPE, High-temp PEEK, Transparent PC/PMMA) and metal alloys. Furthermore, we excel in Two-shot molding and Overmolding processes (e.g., TPE soft rubber overmolded onto a PP or Nylon rigid shell) to achieve better sealing and haptic grip.
Q: Large thin-walled parts are prone to warping or sink marks during injection/casting. How do you solve this?
A: For large thin-walled parts, we utilize CAE Mold Flow Analysis software during the design phase to simulate melt flow and optimize cooling channel layouts. During production, we strictly control barrel temperatures and mold temperatures, adjusting holding times and gate numbers to minimize warpage and surface sink marks.
- Precision Machining (CNC)
Addressing the pursuit of micron-level precision, difficult-to-cut materials, and reverse engineering:
Q: What is the highest precision tolerance you can achieve with CNC machining, and what difficult materials can you cut?
A:On our high-precision 5-axis machining centers, we can consistently hold tolerances as tight as ±0.005mm (5 microns) on critical features. We specialize in cutting difficult-to-machine materials, including Aerospace Titanium (Gr5), Nickel-based Superalloys (Inconel 718), and hardened tool steels (HRC 58-62).
Q: We only have physical samples, not 3D drawings. Can you do reverse engineering?
A:Yes. If you only have a physical sample, we can send it to our Blue Light 3D Scanner for high-precision scanning to generate point cloud data. Our CAD engineers will then create a reverse-engineered model and provide free structural optimization suggestions before outputting the machining program.
Q: Is there a big price difference between machining one prototype vs. ten thousand pieces?
A:The difference is significant. CNC machining is subtractive manufacturing; the cost of a single prototype is high due to tool wear, programming/setup time, and machine occupancy fees. However, if the quantity reaches 10,000 pieces, we strongly recommend switching to Injection Molding or Die Casting (depending on material), as the per-unit cost after mold amortization will be much lower than pure CNC machining.
Q: Can you achieve mirror-surface finishes on aluminum parts after CNC milling?
A: Absolutely. After fine CNC milling, aluminum parts typically show slight tool marks. We can perform secondary operations like High-Speed Finishing (HSF) to remove tool paths, or combine processes like Polishing and Anodizing (Type II/III) to achieve effects ranging from satin brushed to mirror-high gloss, widely used in consumer electronics casings.
Q: How do you ensure burr-free and smooth inner walls when machining deep holes or micro-holes?
A:For deep holes (Aspect Ratio >10:1) and micro-holes, we use rigid tapping, helical interpolation drilling, and High-Pressure Through-Spindle Coolant (HPC) to prevent tool breakage and poor chip evacuation. Post-machining, we utilize internal bore polishing or roller burnishing to improve inner wall roughness, ensuring no burrs at hole entrances/exits.
- Sheet Metal & Forming Parts
Addressing concerns about bend deductions, weld quality, and outdoor rust prevention:
Q: What are the common material thickness ranges and metals used for sheet metal fabrication?
A:Our sheet metal shop is equipped with everything from micro-benders to large CNC press brakes, processing materials from 0.5mm ultra-thin sheets up to 12mm thick plates. Common materials include Cold Rolled Steel (SPCC), Hot Rolled Steel, Galvanized Steel (SECC), Stainless Steel (304/316), and Aluminum Alloys (5052/6061).
Q: How do you determine the bend deduction (K-factor) for sheet metal bending?
A:Bend deduction depends on material thickness, bend radius, and the metal’s tensile strength. Our engineers calculate the exact K-factor for unfolding sheet metal drawings, using actual test bends to verify dimensions. This ensures the final bent part length matches the 3D design perfectly, preventing gaps or overlaps during assembly.
Q: What is the minimum bend radius for thick plates, and will they crack during bending?
A: The minimum bend radius is recommended to be no less than half the material thickness (varies by material; e.g., Low-carbon steel can be tighter than Stainless Steel). For thick plates or high-hardness materials, we perform annealing or place rubber pads on the press brake dies to absorb tensile stress and prevent cracking at the bend root.
Q: If sheet metal parts need assembly, do you provide welding and riveting services?
A: Yes. We have a professional welding team skilled in TIG (Argon Arc), MIG/MAG, and Spot Welding. All welds undergo grinding for smoothness and NDT (Non-Destructive Testing) if required. We also provide mechanical fastening solutions like Riveting, Clinching, and Self-tapping screws for different structural assemblies.
Q: How do you prevent rust on outdoor sheet metal parts after fabrication?
A:Surface protection is key to the lifespan of fabricated parts. We offer comprehensive solutions: Hot-Dip Galvanizing (HDG) for maximum corrosion resistance (80-100μm coating), and Polyester Powder Coating in various RAL colors for enhanced durability and visual appeal on structural components.