JPH076961Y2 - Seat bar joint structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention provides a strong method for joining a preceding sheet bar and a following sheet bar between a rough rolling machine and a finishing rolling machine of a hot rolling line. The present invention relates to a joint structure of a sheet bar which can achieve various joints.

[Prior Art] Conventionally, in a hot rolling line, it is necessary to prevent the line speed from being lowered due to the passage of a sheet bar,
For the purpose of suppressing the occurrence of shape defects that must be cut in the post process at the front and rear ends of the sheet bar, the preceding sheet bar and the following sheet bar are integrally joined before rolling, and after rolling is completed. It was done to divide the seat bar again.

Thus, as an example of a device for joining the preceding sheet bar and the succeeding sheet bar, there is a device described in JP-A-61-23503.

According to Japanese Patent Laid-Open No. 61-23503, as shown in FIG.
A trolley 2 capable of reciprocating in a sheet bar traveling direction 1 is provided on the inlet side of a finish rolling machine (not shown) in the hot rolling line,
A pinch roll 4 capable of clamping and feeding the trailing seat bar 3 is provided at a position upstream of the seat bar 1 in the traveling direction of the seat bar 2 and at a position downstream of the seat bar traveling direction 1 in the upper part of the carriage 2. Is provided with a clamp device 6 capable of clamping the preceding seat bar 5, and further, a seat bar punching device 7 as described later is provided at an intermediate position between the pinch roll 4 and the clamp device 6 on the upper portion of the carriage 2, and the seat bar is also provided. A sheet bar punching device for sheet bar punching device 8 by causing the laminating plate 8 to be at an intermediate position between the punching device 7 and the clamping device 6 and having a rising slope as it goes downstream in the sheet bar traveling direction 1 and causing the laminating plate 8 to perform an elliptical motion. A stacking device 10 including a drive mechanism 9 for moving in and out of the device 7 is provided.

The seat bar punching device 7 is stacked and fixed on the upper surface of the trolley 2, and protrudes downward as shown in FIG. 6 at the punching part 11 on the upstream side of the seat bar traveling direction 1. A lower blade 13 having a plurality of protrusions 12 having a width dimension a of the tip portion wider than the width dimension b of the root portion and having the same size as each other, and held on the upper surface of the carriage 2 so as to be able to move up and down,
A lower holder 15 having a groove 14 that fits into the protrusion 12 of the lower cutter 13, and a lower holder 15 that is vertically movable above the lower holder 15 and punches a surface on the downstream side of the seat bar traveling direction 1. To the department
An upper blade 16 having a plurality of groove portions that fit into the protrusion 12 of the lower blade 13, and an upper blade 16 arranged to be movable above and below the lower blade 13 and fitted into the groove portion of the upper blade 16. And an upper holder 17 having a protrusion.

In the figure, 18 is a pusher provided on the side of the lower blade 13 of the seat bar punching device 7, and 19 is a seat bar punching device 7.
Joining end welding device provided on the side of the lower blade 13 of the
Is a stopper provided on the stacking plate 8 of the stacking device 10, 21 is the leading end of the trailing sheet bar 3, and 22 is the trailing end of the preceding sheet bar 5.

When joining the preceding sheet bar 5 and the following sheet bar 3, first, as shown in FIG. 7, the rear end portion 22 of the preceding sheet bar 5 is the lower holder 15 of the sheet bar punching device 7. When reaching the upper part of the lower blade 13, the clamp device 6 is operated to clamp the preceding seat bar 5, and the carriage 2 is run in the seat bar traveling direction 1 at the line speed.

Next, as shown in FIG. 8, before the trailing sheet bar 3 is sent to the sheet bar punching device 7 by the pinch roll 4, the stacking device 10 is operated to move the stacking plate 8 to the lower holder 15 and the lower side. Wait on top of the blade 13.

Then, the trailing sheet bar 3 sent by the pinch rolls 4 is placed on the stacking plate 8, so that the leading end portion 21 of the trailing sheet bar 3 is provided on the stacking plate 8 as shown in FIG. When the stacking plate 8 is retracted from the seat bar punching device 7 when it hits the stopper 20, the leading end of the trailing seat bar 3 is attached to the trailing end 22 of the preceding seat bar 5, as shown in FIG. The parts 21 are superposed.

In this way, when the sheet bars 3 and 5 are overlapped, the upper blade 16 and the upper holder 17 are lowered, the sheet bars 3 and 5 are punched between the lower blade 13 and the upper blade 16, and the preceding sheet bar 5 The rear end portion 22 and the front end portion 21 of the following seat bar 3 have
As shown in the figure, a concave-convex portion 2 which has a plurality of dovetail grooves and dovetail holes alternately and which can be telescopically fitted and locked to each other 2
Form 3,24.

When the seat bars 3 and 5 are punched out, the lower holder 1
Since 5 is pushed down by the upper cutter 16 and descends, the position of the trailing seat bar 3 is lower than the position of the preceding seat bar 5, as shown in FIG. During this time, the scrap material cut off is removed using the pusher 18.

After that, the upper cutter 16 is lifted and the lower holder 15 is lifted to the same height as the lower cutter 13, whereby the rear end portion 22 of the preceding seat bar 5 and the leading end portion 21 of the following seat bar 3 are uneven. The parts 23 and 24 are fitted and locked to each other as shown in FIG.

Finally, by welding at least the width end of the joint between the rear end 22 of the preceding sheet bar 5 and the front end 21 of the following sheet bar 3 using the joint end welding device 19, the joint is welded. Improve the strength and complete the joining.

Also, as a disclosure of a similar technique, Japanese Patent Laid-Open No. 63-115605.
In the Japanese Patent Laid-Open No. 63-115605, at least the width end of the joint between the rear end 22 of the preceding seat bar 5 and the front end 21 of the following seat bar 3 is finally welded. Alternatively, as shown in FIG. 13, by providing an arcuate notch 25 at the width end of the joint, stress is prevented from concentrating on the width end of the joint during rolling. There is.

[Problems to be Solved by the Invention] However, the above-described conventional joint structure of the seat bar has the following problems.

That is, the trailing edge 22 of the preceding seat bar 5 and the trailing seat bar 3
Since the plurality of concavo-convex portions 23 and 24 formed on the tip end portion 21 of all of the concavo-convex portions are all uniform in size, the way of assembling the boundary between the preceding sheet bar 5 and the following sheet bar 3 becomes relatively simple.
A strong joining state cannot be obtained between the preceding seat bar 5 and the succeeding sheet bar 3 only by fitting the concavo-convex portions 23 and 24 to each other, and the concavo-convex portions 23 and 24 are fitted to each other. After this, at least the width end of the joint is welded to improve the strength of the joint, as disclosed in JP-A-61-23503. It has been necessary to take measures such as providing arcuate notches 25 at the width ends to prevent stress concentration on the joints, which has led to an increase in man-hours.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a seat bar joint structure capable of firmly joining a leading seat bar and a following seat bar only by fitting the concavo-convex portions together. It is a thing.

[Means for Solving the Problems] In the present invention, the width dimension of the leading end portion or the middle portion is wider than the width dimension of the root portion of one of the trailing end portion of the preceding sheet bar and the leading end portion of the trailing sheet bar. A plurality of convex portions are formed, and a plurality of concave portions that can be fitted and locked to the respective convex portions are formed on the other of the rear end portion of the preceding sheet bar and the leading end portion of the following sheet bar, and the convex portion is formed. The present invention relates to a joint structure of a seat bar, characterized in that the portions and the recesses are combined in different sizes.

[Operation] According to the present invention, the leading end portion of the leading seat bar and the leading end portion of the trailing seat bar are engaged with each other by fitting and locking the convex portion formed on one side and the concave portion formed on the other side. The seat bar and the succeeding seat bar are joined.

At this time, since the convex portions and the concave portions having different sizes are combined, the boundary between the preceding sheet bar and the succeeding sheet bar is complicatedly complicated. To be joined.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention.

Further, in the drawings, since the basic structure of the joint portion structure of the seat bar and the details of each constituent part include the same as those shown in FIGS. 5 to 13, the same constituent part The same reference numerals are used to omit the description,
Only the structure unique to the present invention will be described below.

In the rear end portion 22 of the preceding seat bar 5, large and small convex portions 26, 27 whose width dimension d of the front end portion (or middle portion) is wider than the width dimension c of the root portion are arranged in the seat bar width direction 28. Alternately project.

Similarly, the leading end portion 21 of the trailing seat bar 3 is fitted with the protruding portions 26, 27 of the preceding seat bar 5 and has large and small recesses 29, which can be engaged and locked.
30 are alternately formed in the seat bar width direction 28.

Next, the operation will be described.

The process of forming the convex portions 26, 27 and the concave portions 29, 30 on the rear end portion 22 of the preceding sheet bar 5 and the front end portion 21 of the following sheet bar 3 is the same as in FIGS. .

According to the present invention, the large and small convex portions 26, 27 formed on the rear end portion 22 of the preceding seat bar 5 and the large and small concave portions 29, 30 formed on the front end portion 21 of the following seat bar 3 are fitted into each other in a nesting manner. By locking, the leading seat bar 5 and the following seat bar 3 are joined.

At this time, large and small convex portions 26, 2 are formed on the rear end portion 22 of the preceding seat bar 5.
7 are formed, and large and small recesses 2 are formed in the leading end 21 of the trailing seat bar 3.
Since 9 and 30 are formed so that the boundary between them is complicatedly complicated, a larger joining force can be obtained than in the case of FIGS. 5 to 13 in which all the concave and convex portions have the same size. Will be available.

As a result, at least the end portions of the joining portion are welded in order to strengthen the joining force between the rear end portion 22 of the preceding sheet bar 5 and the leading end portion 21 of the trailing sheet bar 3, or at the time of rolling, There is no need to provide arcuate cutouts at the ends of the joint to prevent stress concentration at the ends.

FIG. 2 shows a second embodiment of the present invention, in which large and small convex portions 26, 27 formed on the rear end portion 22 of the preceding seat bar 5 and large and small convex portions formed on the front end portion 21 of the following seat bar 3 are shown. The recesses 29, 30 have the same configuration as that of the above-described embodiment except that the size relationship between the recesses 29, 30 is the opposite pattern to that of FIG. 1, and the same operation / effect can be obtained.

FIG. 3 shows a third embodiment of the present invention, in which large and small convex portions 26, 27 formed on the rear end portion 22 of the preceding seat bar 5 and large and small convex portions formed on the front end portion 21 of the succeeding seat bar 3. Recesses 29, 30
The large convex portion 26 and the concave portion 29 are arranged on the center side of the seat bar width direction 28, and the small convex portion 27 and the concave portion 30 are arranged on both end sides of the seat bar width direction 28. The same configuration is provided, and the same operation / effect can be obtained.

FIG. 4 shows a fourth embodiment of the present invention, in which large, medium and small convex portions 31, 32, 33 are formed on the rear end portion 22 of the preceding seat bar 5, and the leading end portion 21 of the following seat bar 3 is formed. Forming large, medium and small recesses 34, 35, 36 which are fitted and locked to the large, medium and small projections 31, 32, 33, the large, medium and small projections 31, 32, 33 and the recesses 34, 35, 36 are formed. The arrangement is similar to that of each of the above-described embodiments except that the arrangement is a goose-like arrangement in the seat bar width direction 28, and the same operation / effect can be obtained.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[Effects of the Invention] As described above, according to the joint structure of the seat bar of the present invention, since the recesses and the protrusions having different sizes are combined, the leading seat bar and the following seat bar are fitted and locked. It is possible to obtain a strong joint state between the two by only doing so, and therefore it is possible to eliminate the work such as welding or forming a notch at the end of the joint between the two in a later step. It can produce the effect.

[Brief description of drawings]

1 is a plan view of a first embodiment of the present invention, FIG. 2 is a plan view of a second embodiment of the present invention, FIG. 3 is a plan view of a third embodiment of the present invention, and FIG. FIG. 5 is a plan view of a fourth embodiment of the present invention, FIG. 5 is an overall perspective view of a seat bar joining device in a conventional example, FIG. 6 is a partially enlarged plan view of the lower cutter of FIG.
7 to 12 are operation diagrams showing the joining process of the seat bar using FIG. 5, and FIG. 13 is a plan view of the joining portion of the seat bar in another conventional example. In the figure, 3 is the trailing seat bar, 5 is the leading seat bar, 21 is the leading end of the trailing seat bar 3, 22 is the trailing end of the leading seat bar 5, 26, 27, 31, 32, 33 are convex portions, 29,30,34,35,36 are concave parts, c
Is the width of the root of the protrusion 26, 27, 31, 32, 33, d is the protrusion 26,2
Indicates the width of the tip or middle of 7,31,32,33.

Claims (1)

[Scope of utility model registration request] 1. A plurality of convex portions having a width dimension of a leading end portion or an intermediate portion which is wider than a width dimension of a root portion are formed on one of a trailing end portion of a preceding sheet bar and a leading end portion of a following sheet bar. A plurality of concave portions that can be fitted and locked to the respective convex portions are formed on the other of the rear end portion of the preceding sheet bar and the front end portion of the following sheet bar, and the convex portions and the concave portions have different sizes. A joint structure for a seat bar, which is characterized by being formed by combining a plurality of materials.