Back to results
US 11,590,549 B2Granted
Method of manufacturing hot press-formed member having excellent productivity, weldability and formability
AssigneePosco
InventorsHong Gee Kim, Hyun Sung Son
Life of this patent
Estimating the term…
Abstract
An method of manufacturing a hot press-formed member comprises heating a blank of an aluminum-based plated steel sheet in a heating furnace, removing the heated blank from the heating furnace and conveying the removed blank between an upper mold portion and a lower mold portion of a mold, mounted on a press, to be seated; and performing a forming process after the upper mold portion of the mold is in contact with the seated blank.
Claims12
A method of manufacturing a hot press-formed member, the method comprising:
- heating a blank of an aluminum-based plated steel sheet in a heating furnace;
- removing the heated blank from the heating furnace and conveying the removed blank between an upper mold portion and a lower mold portion of a mold, mounted on a press, to be seated;
- and
- performing a forming process after the upper mold portion of the mold is in contact with the seated blank,
- wherein the heating furnace is a continuous heating furnace comprising section A, section B, and section C provided in a conveying direction of a blank,
- heating in section A satisfies conditions specified by a figure ‘abcde’ having cumulative in-furnace maintaining times and in-furnace atmospheric temperature coordinates of approximately a(0.2 min, 750° C.), b(1.0 min, 750° C.), c(1.0 min, 800° C.), d(1.5 min, 900° C.), and e(0.2 min, 900° C.),
- heating in section B satisfies conditions specified by a figure ‘fghi’ having cumulative in-furnace maintaining times and atmospheric temperature coordinates of approximately
- f
-
- (
- 1.3
- +
- t
- -
- 1.2
- 0.6
- ×
- 0.5
-
- min
- ,
- 930
-
- °
-
-
- C
- )
- ,
- g
-
- (
- 3.8
- +
- t
- -
- 1.2
- 0.6
- ×
- 0.5
-
- min
- ,
- 930
-
- °
-
-
- C
- )
- ,
-
- h
-
- (
- 3.3
- +
- t
- -
- 1.2
- 0.6
- ×
- 0.5
-
- min
- ,
- 960
-
- °
-
-
- C
- )
- ,
- and
-
-
- i
-
- (
- 0.8
- +
- t
- -
- 1.2
- 0.6
- ×
- 0.5
-
- min
- ,
- 960
-
- °
-
-
- C
- )
- ,
- and
- heating in section C satisfies conditions specified by a figure ‘jklm’ having cumulative in-furnace maintaining times and atmospheric temperature coordinates of approximately
- j
-
- (
- 3.7
- +
- t
- -
- 1.2
- 0.6
-
- min
- ,
- 870
-
- °
-
-
- C
- )
- ,
- k
-
- (
- 11.7
- +
- t
- -
- 1.2
- 0.6
- ×
- 2
-
- min
- ,
- 870
-
- °
-
-
- C
- )
- ,
- 1
-
- (
- 7.03
- +
- t
- -
- 1.2
- 0.6
- ×
- 2
-
- min
- ,
- 940
-
- °
-
-
- C
- )
- ,
- and
-
-
- m
-
- (
- 2.53
- +
- t
- -
- 1.2
- 0.6
-
- min
- ,
- 940
-
- °
-
-
- C
- )
- ,
- a highest atmospheric temperature of section C is lower than a highest atmospheric temperature of section B,
- Relational Expression 1 is satisfied, and
- a time required before the forming process is performed after the blank is seated is two seconds or less,
- T≤8.2×t+(temp−900)/30 Relation Expression 1:
- where T denotes a sum of time required for conveying and seating a blank and time required before forming is performed after the blank is seated and a unit thereof second (s), t denotes a thickness of a blank and a unit thereof is millimeters (mm), and temp denotes a furnace extraction temperature and a unit thereof is degrees Celsius (° C.).
190 more elements
Dependencies are inferred from the claim text.