Title:
HOT PRESSING METHOD AND HOT PRESSING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/066045
Kind Code:
A1
Abstract:
In a hot pressing method for manufacturing a press-formed article (8, 9) by hot pressing a blank material (7) using a mold (2, 3) including a punch (21, 31), a die (22, 31) and an inner pad (23, 33) which is propelled so as to protrude toward the die (22, 32), a surface temperature T of the inner pad (23, 33) is cooled to a temperature satisfying the following formula, with 100°C as an upper limit, by causing a refrigerant to flow through a refrigerant pathway (233, 333) after the press-formed article (8, 9) has been removed from the mold (2, 3) until the next blank material (7) is set in the mold (2, 3).
T ≤ 100 × (2.3/t) × (h/100) × (λ/30) × (W/2) × S
T: Surface temperature (°C) of inner pad (23, 33)
h: Pressing direction dimension (mm) of inner pad (23, 33)
t: Thickness (mm) of blank material (7)
λ: Thermal conductivity (W/mK) of inner pad (23, 33)
W: Volume ratio (mm3/mm3) of refrigerant pathway within inner pad (23, 33)
S: Flow rate (mm/sec) of refrigerant in refrigerant pathway (233, 333)
Inventors:
OTSUKA KENICHIRO (JP)
Application Number:
PCT/JP2016/079386
Publication Date:
April 12, 2018
Filing Date:
October 04, 2016
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
B21D22/20; B21D24/00; B21D37/16; B30B15/34
Foreign References:
| JP2013202619A | 2013-10-07 | |||
| JPH0747431A | 1995-02-21 | |||
| JP2014233756A | 2014-12-15 | |||
| US20150246383A1 | 2015-09-03 | |||
| JP2014076483A | 2014-05-01 | |||
| US20060277962A1 | 2006-12-14 |
Other References:
See also references of EP 3524366A4
Attorney, Agent or Firm:
KOKUBUN, Takayoshi (JP)
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