Industry Applications
Application
Case Study: Tungsten Carbide Powder Metallurgy Tap Machining
Case study of tap machining for heat-treated 40CrMo disc components.
Case Details
| Nanjing Jianchuanshi Industrial and Trading Co., Ltd. | ||||||||
| Tap Trial Cutting Report | ||||||||
| Customer | A Machinery Factory in Chongqing | Date | March 28, 2023 | Product Image 1 |  |
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| machine bed |
Machine tool type: Vertical machining center | |||||||
| Machine tool spindle type: BT30 | ||||||||
| Tool holder: spring collet | ||||||||
| Cooling Type: External Cooling | Machine tool cooling pressure: | |||||||
| Workpiece | Workpiece Name | Disk component | Workpiece material | 40CrMo | ||||
| Heat treatment | Yes | Hardness | HRC 28~32 | Product Image 2 |  |
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| Processing Procedure | Rough machining – drill pilot holes – apply coating to hole locations – heat treatment – surface grinding – drilling – chamfering – tapping | |||||||
| Workpiece surface | Surface has been machined. |
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| No interference | ||||||||
| Through-hole | ||||||||
| Pre-drilling | None | |||||||
| Processing Requirements | Bottom hole diameter | D10.8±0.01 | Failure Diagram 1 |  |
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| Depth | Tap hole depth: 20 mm; tapping depth: 20 mm. | |||||||
| Tool life requirement: 150 pieces × 10 | ||||||||
| Test | Compare brands | YG lifespan: 150–180 pieces | ||||||
| Test item | Brand | Arrowstone Product 1 | Arrowstone Product 2 | |||||
| Specification Name | Product Name | Wheel Hub Tap (Product Figure 1) | Wheel Hub Tap (Product Figure 2) | |||||
| Product Specifications | M12×1.25 straight groove 5P | M12×1.25 helical 5P | Failure Diagram 2 |  |
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| Cutting parameters | Rotational Speed - N r/min | 230 | 230 | |||||
| Feed rate - Vf mm/min | 287 | 287 | ||||||
| Trial Cutting Results | Test 1: Tool Life – Number of Holes | 203 workpieces × 10 | 12 workpieces * 10 | |||||
| Invalid state | Wear, but not stop gauge | Front end chipping with 5 teeth; single-edge insert (see Failure Figure 1). | ||||||
| Test 2: Tool Life – Number of Holes | 113 workpieces × 10 | 120 workpieces * 10 | Failure Diagram 3 |  |
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| Invalid state | Front end chipping with three cutting edges and two edge bands (see Failure Figure 2). | Back-end chipping of 1 tooth (see Failure Figure 3). | ||||||
| Conclusions and Recommendations | Conclusion | The processing life of Arrowstone’s straight-flute powder metallurgy taps is approximately 30% longer than that of currently used products. | ||||||
| Suggestion | The anterior angle of the cusp can be slightly modified by adding a small amount of chamfering. | |||||||
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