The application of DCMX

TM

Technical Data No. SD1901
Daido Steel Co., Ltd.
Tool Steel Solution Dept.
Tool Steel Div.
DCMX is a trademark or registered trademark of Daido Steel Co., Ltd.
© 2020 Daido Steel Co., Ltd.

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1. Piercing Punch: Trial result
・Tool: φ10.2mm PVD coated punch for progressive die・Work material: High strength steel sheet, 780MPa,
t=1.6mm・Clearance: 1.45 mm (about 10% of the sheet thickness)
・Cycle time: 55spm
・Failure mode: Chipping at the edge

Upper diePunch

Lower dieWork materialwith an Incline of 3 degrees

dieChipping

JIS SKD11 (DIN 1.2379/ AISI D2 eq.) (59HRC)

DCMX (62HRC)

Die life = 10,000 shot

Die life = more than 10,000 shot

Source: Nakahama, Conference on Die and Mould Technology, Presentation file, June 2010.
© 2020 Daido Steel Co., Ltd.

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1. Piercing Punch: Analysis result
Reducing coarse carbides to reduce chipping
JIS SKD11 (DIN 1.2379/ AISI D2 eq.) has a lot of primary coarse carbides. The coarsecarbides might be a chipping initiation site. DCMX has almost no primary coarse carbides,
it is a matrix type cold work steel. So, DCMX has contributed to reduce the chipping risk.

Improving the fatigue property and toughness
The crack occurred because the punch was being run thousands of shots. From thisreason, the punch needs the high fatigue property and high toughness to prevent thecrack. Basically, DCMX (62HRC) has higher fatigue property and toughness than JIS
SKD11 (59HRC). So, DCMX has contributed to prevent the chipping.

© 2020 Daido Steel Co., Ltd.

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2. Trimming Punch : Trial result
・Product: Cross member・Tool size: H80 x W110 x L130mm
・Heat treatment: High temperature tempering・Surface treatment: PVD coating
・Work material: High strength steel sheet,440MPa,
t=2.9mm・Failure mode: Galling and Chipping

Chipping
Galling

Galling
Chipping

Only slight galling
JIS SKD11 modified steel grade (59.5 HRC)

DCMX (61.5 HRC)

Die life = 80,000 ~ 120,000 shot

Die life = 200,000 shot
Only slight galling, no chipping

Source: Nakahama, Technical papers of Conference on Die and Mould Technology, June 2010, p.228-229
Nakahama, Kata-Gijyutsu (Die and Mould Technology), 2010, Vol.25, No.7, p.134-135© 2020 Daido Steel Co., Ltd.

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2. Trimming Punch: Analysis result
Improving the fatigue property and toughness
The crack occurred because the punch was being run thousands of shots. From thisreason, the punch needs the high fatigue property and high toughness to prevent thecrack. In case of this trial, DCMX (62HRC) has higher fatigue property and toughness
than competitive steel grade (60HRC). So, DCMX has contributed to prevent the chipping.

Increasing hardness(DCMX can get over 60HRC with 1030℃ hardening)
The galling was the streaky scratch from the chipping point, it was high possibility thatwear due to the jamming by burr of work material and die material.
So, keeping the PVD coating was important for this die to prevent the galling.
Generally, higher hardness makes to improve the adhesive strength of ceramic coating.
The higher hardness of DCMX (62HRC) compared to competitive steel grade has
contributed to prevent the galling.
Source: Nakahama, Technical papers of Conference on Die and Mould Technology, June 2010, p.228-229
Nakahama, Kata-Gijyutsu (Die and Mould Technology), 2010, Vol.25, No.7, p.134-135© 2020 Daido Steel Co., Ltd.

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3. Shearing Blade : Trial result
・Tool size: H80 x W110 x L130mm
・Heat treatment: High temperature tempering・Surface treatment: No coating
・Work material: High strength steel sheet,440MPa,
t= 4 ~ 6mm
・Failure mode: Chipping

1mm

Starting chipping by 3,000 shots

JIS SKD11 (DIN 1.2379/ AISI D2 eq.) (59HRC)

DCMX (59HRC)

Die life = 20,000 shot

Die life = 88,000 shot

Source: Suzuki, Technical papers of Conference on Die and Mould Technology, June 2012, p.96-97
Suzuki, Kata-Gijyutsu (Die and Mould Technology), 2012, Vol.27, No.7, p.004-005© 2020 Daido Steel Co., Ltd.

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3. Shearing Blade: Analysis result
Reducing coarse carbides to reduce chipping
JIS SKD11 (DIN 1.2379/ AISI D2 eq.) has a lot of primary coarse carbides. The coarse
carbides might be a chipping initiation site. DCMX has almost no primary coarse carbides,
it is a matrix type cold work steel. So, DCMX has contributed to reduce the chipping risk.

Improving the fatigue property and toughness
The crack occurred because the punch was being run thousands of shots. From thisreason, the punch needs the high fatigue property and high toughness to prevent thecrack. Basically, DCMX (59HRC) has higher fatigue property and toughness than JIS
SKD11 (59HRC). So, DCMX has contributed to prevent the chipping.
Source: Suzuki, Technical papers of Conference on Die and Mould Technology, June 2012, p.96-97
Suzuki, Kata-Gijyutsu (Die and Mould Technology), 2012, Vol.27, No.7, p.004-005© 2020 Daido Steel Co., Ltd.

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Other applications
ToolProducts
Work: TS, Thickness
Coating

Conventional steels

DCMX

Cutting blade*Lower arm
590MPa, t=2.6mm
PVD coatingSKD11 mod. (58 HRC)
50,000 shot
Chipping(61 HRC)More than 50,000 shot
No chipping

Blanking die*Blank
590MPa, t=2.0mm
No coating

SKD11 (59 HRC)
2,000~4,000 shot
Chipping(61 HRC)
19,000 shot
No chipping

Center pillar
780MPa, t=1.2mm

SKD11 (61 HRC)
960 shot
Chipping(61 HRC)
33,000 shot
No chipping

SKD11 mod. (59 HRC)
8,000 shot
Galling(61 HRC)More than 55,000 shot
No chipping

SKD11 (58HRC)
10,000 shot
Chipping(59 HRC)More than 100,000 shot
No chipping

Trimming die*

Trimming die*

Trimming die**590 MPa, t=2,0mm
PVD coating

Die life

Metal bush
Fe-Cu sheet, t=3.7mm*:Source: Nakahama, Technical papers of Conference on Die and Mould Technology, June 2010, p.228-229
Nakahama, Kata-Gijyutsu (Die and Mould Technology), 2010, Vol.25, No.7, p.134-135**:Source: Suzuki, Technical papers of Conference on Die and Mould Technology, June 2012, p.96-97
Suzuki, Kata-Gijyutsu (Die and Mould Technology), 2012, Vol.27, No.7, p.004-005© 2020 Daido Steel Co., Ltd.

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