Multiple bar straightening and cutting system in bar steel...

Details Multiple bar straightening and cutting system in bar steel... Multiple bar straightening and cutting system in bar steel...

1999-09-28

2001-08-28

Tolan, Ed (Department: 3725)

Metal deforming

By use of roller or roller-like tool-element

With cutting of work or product

C072S011100, C072S160000, C072S250000

Reexamination Certificate

active

06279367

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a multiple section bars straightening/cutting system in a rolling mill.
BACKGROUND ART
Section bars rolled in a rolling mill ordinarily have a length of several tens to several hundreds of meters. The products having been rolled are divided into products having a suitable length in accordance with the length of a cooling bed so as to be supplied to a next cooling process and cooled. The divided products having been cooled are cut and corrected again sometimes offline. Dominant in modern rolling mills, however, is a method of straightening the cooled products inline downstream of the cooling process and cutting them to a product length.
FIG. 36
is a view explaining the outline of an ordinary inline straightening/traveling cutting system in a section bar rolling line. In
FIG. 36
, numeral
51
denotes a multiple section bars straightening apparatus disposed to the outlet side of a cooling bed, numeral
52
denoted an inter-machine table, numeral
53
denotes a first measuring roll disposed downstream of the multiple section bars straightening apparatus
51
, and numeral
54
denotes a presser roller
54
disposed downstream of the first measuring roll
53
for pressing a section bar coming off the multiple section bars straightening apparatus
51
against the inter-machine table
52
.
Numeral
55
denotes a traveling cutting machine disposed downstream of the presser roller
54
and numeral
56
denotes a second measuring roll
56
disposed downstream of the traveling cutting machine
55
. Numeral
57
denotes an outlet side presser roller
57
disposed downstream of the second measuring roll
56
and numeral
58
denotes a rear surface tilting table
58
disposed downstream of the outlet side presser roller
57
.
Further, (a), (b) and (c) in
FIG. 36
time-sequentially show the tail end of a section bar to be corrected and cut, wherein (a) shows (n−2) cut which is 2 cuts before final cut (n cut), (b) shows (n−1) cut which is 1 cut before the final cut (n cut) and (c) shows the final cut (n cut), respectively. Note that a product length is shown by L and a tail end block length is shown by
1
c.
Next, a cutting job for the tail end portion of a section bar will be described based on FIG.
36
.
In the state of the (n−2) cut shown in (a), the section bar is restricted by the multiple section bars straightening apparatus
51
and fed downstream, cut to the product length L by the traveling cutting machine
55
and the length of the remaining portion thereof is made to 2L+lc. Note that, the rear surface tilting table is tilted in a cutting direction so that the section bar is not bent while it is cut.
In the state of (n−1) cut shown in (b), the section bar is still restricted by the multiple section bars straightening apparatus
51
and the length of the remaining portion after it is cut by the traveling cutting machine
55
is made to L+lc.
Thereafter, since the tail end of the section bar comes off the multiple section bars straightening apparatus
51
before it is subjected to n cut, first, the section bar is fed downstream while being synchronized with the multiple section bars straightening apparatus
51
in the state that it is pressed against the inter-machine table
52
by the presser roller
54
before it comes off the multiple section bars straightening apparatus
51
. After the section bar comes off the multiple section bars straightening apparatus
51
, it is fed downstream by the restricting force of only the inlet side presser roller
54
.
Then, as soon as the leading edge of a finally cut product (length: L+lc) is fed up to the position of the outlet side presser roller
57
, it is pressed against the rear surface tilting table
58
by the outlet side presser roller
57
and subjected to the final n cut.
A reason why the section bar is restricted by the inlet side presser roller
54
and the outlet side presser roller
57
will be described.
The section bar having come off the multiple section bars straightening apparatus
51
is disposed such that it can be conveyed by the inter-machine table
52
and the rear surface tilting table
58
. However, the feed velocities of multiple section bars cannot be similarly controlled when they are conveyed by the inter-machine table
52
and the rear surface tilting table
58
and a difference of velocities is caused between respective section bars having come off the multiple section bars straightening apparatus
51
and disposed in parallel with each other. Accordingly, it is very difficult to perform the n cut thereto within tolerance. To cope with this problem, the section bars having come off the multiple section bars straightening apparatus
51
are restricted by the inlet side presser roller
54
and the outlet side presser roller
57
so that the difference (delay) of velocities is not caused between the respective section bars disposed in parallel with each other.
As described above, means for feeding multiple section bars while restricting them are required upstream and downstream of the traveling cutting machine
55
to accurately cut them to the final cut (n).
In contrast, in order to prevent the bending of a section bar when it is cut while being restricted, the leading end of the section bar must be moved in the same direction as that in which a blade moves when it is cut. For this purpose, the rear surface tilting table
58
is installed.
FIG. 37
shows a specific example of the inline straightening/traveling cutting system for explaining a system employed in a company A. In
FIG. 37
, the portions having the same functions as those of
FIG. 36
are denoted by the same numerals. Arrangements characteristic to the system will be specifically described based on FIG.
37
.
First, a traveling cutting machine
55
will be described. The traveling cutting machine
55
employed by the company A is called a crank type shear. The crank type shear has a pair of crank shafts disposed above and below a pass line of a product. Crank arms are rotatably engaged with the crank shafts. The crank arms are formed to key shapes which are opposite to each other and execute operations at the upper end and the lower ends thereof. Then, an end of the key-shaped crank arm has a blade holder formed thereat on which a blade is mounted and the other end thereof is journaled by an arm which is swingable in a fan-shape.
The pair of crank shafts are rotated by a drive unit through gears. The rotation of the crank shafts causes the blade holders of the crank arms engaged therewith to make up/down symmetric motions with respect to the pass line. Then, the blades are opened, closed and opened in the one cycle of the motions to thereby cut a product.
Note that the upper and lower blades employed by the traveling cutting machine
55
are open blades independently mounted on the blade holders of the pair of crank arms and perform traveling and opening/closing motions (rising and falling motions) while the crank shafts rotate once.
FIG. 38
shows an example of the open blades. FIG.
38
(
a
) shows open blades for angle steel, FIG.
38
(
b
) shows open blades for channel steel, and FIG.
38
(
c
) shows open blades for H steel.
FIG. 39
is an A—A sectional view of FIG.
38
. As can be seen from
FIG. 39
, the upper and lower blades are independently arranged and independently mounted on a cutting machine (shearing machine) so as to cross each other so that they can be overlapped. Note that the blades open and close (rise and fall) only in a vertical direction when viewed from the cut surface of a product.
FIG. 40
is a view showing another specific example of the inline straightening/traveling cutting system employed by a company B.
The traveling cutting machine
55
employed by the company B is a pendulum type shear.
The pendulum type shear comprises a crank shaft drive unit for opening and closing blades and a drive unit for rotating a crank shaft, which is different from the above crank shaft, for swinging a pendulum forward and backward for traveling cutting.

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