Reasonable selection of internal chip removal deep hole drilling blade material (2)

Titanium alloy (such as grades TC4, TC6, TC11)

The characteristics of titanium alloy during cutting are characterized by small deformation coefficient, high cutting temperature, hard and brittle metamorphic layer on the machined surface, and serious sticking phenomenon. In addition, titanium alloys react chemically with YT-based cemented carbides at high temperatures, resulting in bond wear and chemical wear. Therefore, when deep hole drilling is performed on a titanium alloy, a YG type hard alloy is mainly used as a blade material. Generally, YG8 or YD15 can be selected for the guide block, the outer blade of the drill, the intermediate cutter and the center cutter.

Analysis of drilling test results

The high-temperature nickel-based alloy drilling test uses a single-edge internal chip deep-hole drill to drill the N901 high-temperature nickel-base alloy. The tooth materials are selected from YD15, YG10H or 643 cemented carbide. Tests show that, within a reasonable range of cutting amount, bright C-shaped chips and spiral coils can be obtained. The tool has high durability, stable aperture size, small change amount, processing precision of IT9~IT10, and roughness Ra. 3.2 ~ 6.3μm, the straightness error is within 0.02mm.

Precipitation stainless steel drilling test

The multi-blade wrong tooth deep chip drill bit is used. The structure is shown in Figure 1. The tooth material is YG8, YW1 or 813 respectively. The deep hole drilling test is carried out on the 0Cr17Ni4Cu4Nb precipitated stainless steel. The results show that as long as the geometry of the tool is The cutting amount is reasonable, and the ideal drilling effect can be obtained. For example, when the feed rate is 0.08-0.12 mm/r and the cutting speed is 45-60 m/min, bright C-shaped chips and spiral coils can be obtained. The tool has high durability, stable aperture size, small change amount, processing precision of IT9~IT10, roughness Ra=3.2～6.3μm, straightness error within 0.02mm.

Figure 2 Internal chip removal deep hole drilling

Titanium alloy drilling test

Drilling TC4 titanium alloy, YG type hard alloy (YG8 or YD15), the bit structure is shown in Figure 2. The key is to optimize the geometrical angle of the tool. Under reasonable geometric angle, a reasonable range of cutting amount can be determined. When the feed rate is 0.12~0.16mm/r and the cutting speed is 30~40m/min, the drilling effect is the most ideal, the drill bit has better durability, the aperture size consistency is good, the workpiece processing quality is stable, and the dimensional accuracy can reach IT9~ IT11 grade, processing surface roughness Ra = 3.2 ~ 6.3μm. Due to the smooth processing process, the radial force of the drill bit does not change much, the guide is reliable, and the most common spiral groove phenomenon in deep hole drilling is eliminated, the skew of the hole axis is reduced, and the processing quality of the deep hole is ensured.

Conclusion

Reasonable selection of deep chip drilling insert material is one of the main technological measures to ensure the smooth running of deep hole drilling and improve the durability of the tool. It is an important factor affecting the processing precision and improving the productivity.

The material of the deep hole drilling blade mainly depends on the properties of the material to be processed, and the corresponding material to be processed should be the corresponding cemented carbide.

For deep hole drilling of difficult-to-machine materials, choose blade materials such as YG8 and YD15 with good strength, impact resistance and wear resistance.

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