SUMITOMO GND slotting tool holder selection and troubleshooting

AC8025P: General processing of steel, suitable for grooving and cutting of carbon steel and alloy steel.

AC8035P: Heavy intermittent processing of steel, with stronger resistance to chipping.

AC5015S: Preferred for heat-resistant alloys and rare materials, suitable for stainless steel and high-temperature alloys.

AC5025S: Heat resistant alloy with heavy intermittent processing, suitable for strong intermittent working conditions.

AC530U/AC1030U: Universal material, covering most materials.

AC425K: Processing of cast iron and ductile iron.

T2500A: Precision machining of steel and stainless steel.

H10/DL1500: Processing of non-ferrous metals.

BN7500: CBN material for powder metallurgy.

In grooving and cutting, material selection should take into account both wear resistance and anti chipping performance. For example, cutting stainless steel is prone to work hardening and adhesion, so AC5015S or AC5025S should be preferred; Carbon steel and alloy steel slots can be cut using AC8025P or AC8035P; Choose AC425K for cast iron groove cutting. For cutting small parts, CF chip breaker combined with AC5015S can achieve stable chip removal and long lifespan at low feed rates.

Common troubleshooting and solution strategies

1. Vibration and chatter

Vibration is the primary issue in grooving and cutting. The solution includes: using GND integral handle or GND Modular high rigidity system; Try to shorten the overhang of the handle as much as possible; Adjust the center height. When cutting grooves and turning horizontally, the center height should be controlled within ± 0.1mm. When cutting, it is recommended to have a center height of 0 to+0.2mm. Use an internal cold tool holder and spray coolant directly onto the cutting edge; Check whether there are burrs or foreign objects on the installation surface of the blade holder and handle.

2. Poor chip removal

Chip blockage can cause blade breakage and surface scratches. The GND series improves chip removal through a combination of wide pocket design, internal cooling oil holes, and chip breaking grooves. Under a cooling pressure of 1000 PSI, the tool life of GNDM-J and GNDL-J internal cooling tool holders can reach 7 times that of conventional external cooling. For cold processing of small holes, the GNDIS and GNDI series offer groove cutting solutions for inner holes with minimum diameters of 14mm and 32mm. If the chip removal is still not smooth, the feed can be reduced, the cooling pressure can be increased, or GL/CF chip breaker can be used instead.

3. Broken blade

Blade breakage is usually caused by vibration, intermittent impact, or insufficient material toughness. Countermeasure: Choose anti collapse blade materials such as AC8025P and AC8035P; Reduce feed per tooth or adopt variable feed; Use RN chip breaker to avoid interference; In cutting applications, avoid pulling out the blade, ensure that the blade slides parallel into the blade seat during installation, and tighten according to the recommended torque.

4. Pull out or loosen the blade

The GND blade adopts a clamping structure, and during installation, the blade needs to be slid parallel into the blade seat and pushed to the bottom, so that the back of the cutting edge is against the constraint surface. Use the recommended torque for tightening to avoid damaging the blade or handle with excessive torque. The 12mm and 16mm square handle of GNDL/GNDM for internal cooling small parts supports blade replacement from the top and bottom, making it convenient for automated production line maintenance.

5. Poor surface quality during processing

Poor surface quality is often related to vibration, improper center height, insufficient sharpness of the cutting edge, or insufficient cooling. The GND series offers sharp groove types such as GF and CF, suitable for low feed precision machining; Internal cooling handle can effectively cool the cutting edge, reduce chip accumulation and tearing. In the cutting groove of the 304 stainless steel measuring component, GND, combined with internal cooling and suitable chip breaking groove, achieves stable chip removal and longer service life.

6. Short tool life

Short tool life needs to be investigated from four aspects: material, chip groove, cooling, and cutting parameters. In the case of cutting pure iron automotive parts, GNDMR616JX-216J, combined with GCMN2002-GF and internal cooling, has a lifespan of 10000 pieces, which is four times that of the competitor's 2500 pieces. In the cutting groove of the sintered part tapping component, GNDLL2020K-220J is matched with GCMN2002-GF, with an internal cooling of 218 PSI, and the service life is 1.7 times that of the competitor. It can be seen that internal cooling and material matching have a significant impact on lifespan.

Practical cases and selection references

4130 steel end face profile: GNDFR2525M-423-125, GCMN4020-RN, vc=660 SFM, f=. 0055 IPR, wet cut. High rigidity, good chip removal, and no vibration.

1045 steel valve cut-off: GNDMR2525M-312, GCMN3002-ML, vc=500 SFM, f=. 002-0.006 IPR, wet cut. Stable without vibration.

H13 steel cutting (45-48HRC): GNDLR2525M-425, GCMN4002-GG, vc=165 SFM, f=. 0012, wet cutting. Prevent accidental blade breakage.