High-precision mixing section machined on 4-axis CNC in 38CrMoAl, hard chrome plated for blow molding machines.
Values below are the standard range keytrond holds for this part family. Tighter requirements are reviewed against the drawing before quotation.
| Tolerance range | IT6 - IT7, profile ±0.02 mm |
|---|---|
| Surface roughness | Ra 0.4 after chrome |
| Common materials | 38CrMoAl |
| Surface treatment | Hard chrome plating, Nitriding, Grinding |
| Machining processes | CNC Milling, CNC Turning, Grinding, Surface Finishing |
| Max machining size | Ø80 - Ø300 mm, length up to 800 mm |
| Applicable industries | Blow Molding Machine |
| Minimum order | 1 pc for sample, 10 pcs for batch |
| Lead time | Sample 10-14 days, batch 20-25 days |
| Drawing requirement | Please provide profile drawing, mixing groove geometry, hardness and chrome thickness. |
The mixing section sits on the screw of a blow molding machine, where it blends color masterbatch and filler into the melt. Groove geometry and surface finish decide how evenly the material is mixed and how long the section lasts against abrasive compounds.
The part is machined from 38CrMoAl on a 4-axis machining center, with the groove profile cut in one continuous pass. After nitriding and grinding, the surface is hard chrome plated to 0.03 - 0.05 mm. Each section is checked for groove depth, concentricity and chrome thickness before delivery.
| Inspection item | Method and instrument |
|---|---|
| Profile and groove depth | Profile projector and depth gauge |
| Concentricity | V-block and dial indicator |
| Chrome thickness | Coating thickness gauge, 0.03 - 0.05 mm |
| Surface roughness | Roughness tester, Ra 0.4 |
A first article inspection report with dimensional results, material certificate and heat treatment record is provided for sample orders. Batch orders are sampled at 10 percent, with full inspection available on request.
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