GB1596569A - Apparatus for longitudinally shearing metal bars - Google Patents

Description

(54) APPARATUS FOR LONGITUDINALLY SHEARING METAL BARS (71) I, ROBERTO MARINUCCI, a Citizen of Italy, of Via Lucio Silla, 59, 80124 Napoli, Italy, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:- The invention relates to the hot continuous shearing into longitudinal sections of metallic bars of rectangular or square cross-section.

At the present plants for steel production capable of continuous casting to produce different sections of dimensions required by the market are provided with many casting lines for the various sections of different dimensions that are to be produced.

In the case of plants for the production of ingots to make products with smaller crosssections and semifinished products there are used successive lines for blooming and inter mediate rolling mills which are often very complicated, and expensive. Such lines often have a low performance and a low efficiency.

In the other cases it is necessary to use reheating furnaces which are very expensive so as to bring the bars back to rolling temperature.

The invention seeks to mitigate these dis advantages.

Thus, the present invention provides an apparatus for the hot continuous shearing into longitudinal sections of metallic bars of rectangular or square cross-section, which comprises a frame, two driven shearing rolls mounted in the frame and spaced apart to define a roll gap therebetween, each roll having a groove whose width is equal to the width of one of the sections, and the rolls and grooves being disposed in relation to each other such that alternate longitudinal sections are displaced upwardly and downwardly relative to the original plane of the bar such as to be incompletely sheared; and separation means for exerting an adjacent sections a transverse force tending to completely separate the adjacent sections.

Preferably, the separation means comprises a tool whose front part adjacent the shearing rolls is wedge-shaped to completely detach the longitudinal sections.

Generally, the tool is provided with profiles for scraping and chamfering the sharp edges of the separated sections.

Usually, cooling means are provided to cool said shearing rolls during operation so as to lose heat absorbed during contact with the hot bar.

Preferably, the position of said shearing rolls can be vertically adjusted in the frame.

Means may also be provided for cooling said tool during operation so as to reduce wear, and for blowing metal shavings or slag from the tool.

The invention will be further described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a lateral view of a shear according to the present invention, with shearing rolls and separation tools; Figure 2 is a view of the shear of Figure 1, looking from the right hand side; Figure 3 is a plan of the lower half of the shear of Figure 1, on the pass-line plane; Figure 4 is a schematic top view of the steps of the working line; Figure 5 is a perspective view showing the shearing action with the bars shown in crosssection in different steps of the shearing action; and Figure 6 is a schematic illustration of the kinds of tools for the lower and upper positions, for all the working possibilities.

In Figures 1, 2 and 3 are three schematic views of a preferred shearing apparatus.

In Figure 4 has been shown a scheme in steps showing the optimal location of the shear in the working cycle.

Figure 1 shows a lower shearing roll 11, seen in cross-section, at the beginning of a first groove where is placed the anterior part of a first tool 22, and an upper shearing roll 12 seen in cross-section at the beginning of the groove where is placed the anterior part of a suspended tool 23.

Between the shearing rolls 11, 12 is a bar 4. The hatching on the lower and upper side of the bar show the path taken by portions of said bar, when the bar 4 is seized by the shearing rolls 11, 12, partially cut, and the longitudinal portions pushed respectively into the grooves of the lower shearing roll 11 and the upper roll 12. Between the shearing roll 11, 12 is represented a rectangle whose greater sides are vertical and smaller ones on horizontal planes, one tangent to the least diameter of the groove of the shearing roll 11 and the other tangent to the least diameter of the groove of the shearing roll 12. This reo tangle is ideal and represents the thickness of bar still to be severed with the crossed lines.

That part of the bar already cut i.e. the portions of bar pushed into the groove of the lower shearing roll 11 and the upper roll 12 is respectively represented by the other two upper and lower parts with uncrossed lines.

Figure 1 also shows tools 21, 22 and 23.

The lower tools 22 contact the two grooves of the shearing roll 11, with the posterior portion supported on a lower cross-bar, parallel to the axis ofthe rolls 11, 12 and having the form of a boot. On this bar is also supported the posterior right portion of the lower toll 21 whose anterior portion rests on a portion of arc of the shearing roll 11 without grooves but between the two grooves 11'. The upper tool 23 leans with its anterior portion on an arc of the groove 12' of the shearing roll 12, and with its posterior portion on an upper crossbar, parallel to the axis of the rolls 11, 12, having the form of an upset boot. The centre of tool 23 is connected with a chain which, besides keeping it suspended forces it up wards. Numeral 32 represents a runout table.

Figure 2 and Figure 3 show the positioning of tools 21, 22, 23.

In the schematic Figure 4 can be distinguished a production plant 6 for large bars having rectangular or square sections, for example continuous casting plants, blooming mills or intermediate mill plants or the heating area of the bar to be longitudinally cut. The bar 4 is transported and travels towards the shearing apparatus to be longitudinally cut.

Table 31 transports the bar towards the shearing apparatus. Numeral 1, 2 indicate the apparatus of the present invention. Numeral 32 indicates the table on which are transported the bars 5 produced by the longitudinal shearing of the bar 4. Finally, numeral 7a represents plants for transverse shearing of bars 5 and cooling bed for the said bars.

In Figure 5 the two shearing rolls 11, 12 are shown sectioned on vertical plane passing through the roll axis; in the shearing rolls can be distinguished two grooves 11' in the lower one and groove 12' in the upper one.

The grooves form three geometric dashed and adjacent sections 51, 52 and 53 which show the cross-section of the bar 4 after the first step in the shearing process.

In Figure 5, bar 4 comes out of a continuous casting machine, or out of a blooming mill 6 (Figure 4), and is transported by roll feeding line 31. Bar 4 is gripped by rolls 11, 12 which have, respectively, grooves 11' and 12'. The numerals 51, 52 and 53 indicate three sections into which the bar 4 has already been divided along shear lines A, B, C, D, where permanent deformation has taken place.

Advancing sections 51, 52 and 53, moved forward by the effect of the rotation of rolls 11, 12, are placed astride lower tool 21, which has faces corresponding to shear lines A, B and face E; which tool, at 21', detaches setions 51 and 53 from section 52, by means of transverse expansion forces. On advancing further, sections 51, 52 and 53 are scraped and chamfered by profiles 21". The other lower tools 22 act as a guide, as does upper tool 23. On advancing still further, sections 51, 52 and 53 are placed on outlet lines 32 and therefore pushed towards an area of transverse shearing and of cooling 7, shown in Figure 4.

Figure 6 shows schematic tool crosssections. Each kind of tool has determined functions. They are all drawn in the lower position, but, overturned, can be mounted in the upper position. All the tools have stripper guide and support functions. The tools 22 and 23 of Figure 1, Figure 2, Figure 3 and Figure 5 correspond to scheme I in Figure 6. The tools II, III and IV have also respectively a transverse push function to the left, to the right, and a contemporaneous push to the left and right (wedging function). The tools V, VI and VII also respectively function to scrape the shearing between the centre bar and the left bar, to scrape the shearing between the centre and the right bar, to scrape contemporaneously the shearings between the centre bar, the left bar and the right bar.

The tools VIII, IX and X also respetively function to chamfer the upper adjacent edge to the left bar, to chamfer the upper adjacent edge to the right bar, and to chamfer contemporaneously the upper adjacent edges to the left and right bar. The tool X sums up all these functions. The tool 21 of Figure 1, Figure 2, Figure 3 and Figure 5, drawn on a small scale, corresponds to the schematized tool X of Figure 6.

The tool 21 functions as follows. The upper surface of the tool is formed, in the direction of its height as regards the intermediate horizontal shearing plane of Figure 1, progressing from the shearing rolls, of a first ascendent portion and of a second descendent longer portion. The first portion acts as stripper guide, the second as support of the side E of the intermediate bar 52 of Figure 5. In Figure 3, starting from the shearing roll 11, on tool 21 is distinguished the portion 21' in which the constant width starts extending until it becomes constant in the anterior parts of blades 21". This transverse expansion on the horizontal plane of the tool having sides 21" in Figure 1 and Figure 5, contemporaneously applies transverse forces to the interior faces A and B of the portions of bar 51 and 53 of Figure 5, or push on the left and push on the right (wedging). Finally, the scraping and the chamfering are performed respectively by the anterior and the posterior parts of the blades 21" of Figure 1, Figure 2, Figure 3 and Figure 5. These blades 21" are elevated as regards the upper surface of the tool 21 to be slightly superior to the portion C and D of Figure 5; the interior faces are spaced from them a quantity equal to the width of the bar 52 and the thickness of each one is equal to the distance between the bar 52 and the bar 51, or between the bar 52 and the bar 53. The posterior blades 21" chamfer the upper edges of the bar 51 and 53 adjacent to the bar 52 of Figure 5. The blades 21" can be in a single piece with the tool 21 or mechanically connected to it.

As shown in Figure 5, the longitudinal sections leave shearing rolls 11 and 12 and meet the tools 21, 22 and 23. The motion of the sections creates equal and opposite force on the faces marked A and B. The tool 21 causes the said forces when the anterior parts of said faces A and B, advancing, meet the anterior parts of the said faces of the wedging portion 21'. The forces act in an horizontal plane perpendicular to the faces marked A and B, and perform the separation of the portions C and D so that the bars 51, 52 and 53, still pushed by the shearing rolls, proceed spaced one from the other by an amount equal to the thickness of the vertical blades 21". The blades 21" scrape the cut faces of the cut, severed and spaced bars 51, 52 and 53 and chamfer the upper edges of the bars 51 and 53 adjacent to the bar 52. Advancing, the bars 51, 52 and 53 go onto the runout table 32 and are pushed forwards, the area of transverse shearing and of cooling.

Of course, the number of longitudinal shearings can be, on the same operating line, different from that above mentioned as an example. In fact, it is only necessary to programme the grooves and to build pairs of shearing rolls and respective tools according to the dimension of the bar to be cut and of the bars to be obtained from it.

The apparatus is sufficiently cooled during the operation and also cleaned from shaving or slag by means of a system already well known.

WHAT WE CLAIM IS: 1. Apparatus for the hot continuous shearing into longitudinal sections of metallic bars of rectangular or square cross-section, which comprises a frame, two driven shearing rolls mounted in the frame and spaced apart to define a roll gap therebetween, each roll having a groove whose width is equal to the width of one of the sections, and the rolls grooves being disposed in relation to each other such that alternate longitudinal sections are displaced upwardly and downwardly relative to the original plane of the bar such as to be incompletely sheared; and separation means for exerting on adjacent sections a transverse force tending to completely separate the adjacent sections.

2. Apparatus according to claim 1 wherein cooling means are provided to cool said shearing rolls during operation so as to lose heat absorbed during contact with the hot air.

3. Apparatus according to claim 1 or claim 2, wherein the position of said shearing rolls can be vertically adjusted in the frame.

4. Apparatus according to any preceding claim, wherein the separation means comprises a tool whose front part adjacent the shearing rolls is wedge-shaped to completely detach the longitudinal sections.

5. Apparatus according to any preceding claim, wherein said tool is provided with profiles for scraping and chamfering the sharp edges of the separated sections.

6. Apparatus according to any preceding claim, wherein means are provided for cooling said tool during operation so as to reduce wear, and for blowing metal shavings or slag from the tool.

7. Apparatus for hot continuous shearing substantially as herein described with reference to the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

1. **WARNING** start of CLMS field may overlap end of DESC **.

   in Figure 1 and Figure 5, contemporaneously applies transverse forces to the interior faces A and B of the portions of bar 51 and 53 of Figure 5, or push on the left and push on the right (wedging). Finally, the scraping and the chamfering are performed respectively by the anterior and the posterior parts of the blades 21" of Figure 1, Figure 2, Figure 3 and Figure 5. These blades 21" are elevated as regards the upper surface of the tool 21 to be slightly superior to the portion C and D of Figure 5; the interior faces are spaced from them a quantity equal to the width of the bar 52 and the thickness of each one is equal to the distance between the bar 52 and the bar 51, or between the bar 52 and the bar 53. The posterior blades 21" chamfer the upper edges of the bar 51 and 53 adjacent to the bar 52 of Figure 5. The blades 21" can be in a single piece with the tool 21 or mechanically connected to it.

   As shown in Figure 5, the longitudinal sections leave shearing rolls 11 and 12 and meet the tools 21, 22 and 23. The motion of the sections creates equal and opposite force on the faces marked A and B. The tool 21 causes the said forces when the anterior parts of said faces A and B, advancing, meet the anterior parts of the said faces of the wedging portion 21'. The forces act in an horizontal plane perpendicular to the faces marked A and B, and perform the separation of the portions C and D so that the bars 51, 52 and 53, still pushed by the shearing rolls, proceed spaced one from the other by an amount equal to the thickness of the vertical blades 21". The blades 21" scrape the cut faces of the cut, severed and spaced bars 51, 52 and 53 and chamfer the upper edges of the bars 51 and 53 adjacent to the bar 52. Advancing, the bars 51, 52 and 53 go onto the runout table

   32 and are pushed forwards, the area of transverse shearing and of cooling.

   Of course, the number of longitudinal shearings can be, on the same operating line, different from that above mentioned as an example. In fact, it is only necessary to programme the grooves and to build pairs of shearing rolls and respective tools according to the dimension of the bar to be cut and of the bars to be obtained from it.

   The apparatus is sufficiently cooled during the operation and also cleaned from shaving or slag by means of a system already well known.

   WHAT WE CLAIM IS: 1. Apparatus for the hot continuous shearing into longitudinal sections of metallic bars of rectangular or square cross-section, which comprises a frame, two driven shearing rolls mounted in the frame and spaced apart to define a roll gap therebetween, each roll having a groove whose width is equal to the width of one of the sections, and the rolls grooves being disposed in relation to each other such that alternate longitudinal sections are displaced upwardly and downwardly relative to the original plane of the bar such as to be incompletely sheared; and separation means for exerting on adjacent sections a transverse force tending to completely separate the adjacent sections.
2. 2. Apparatus according to claim 1 wherein cooling means are provided to cool said shearing rolls during operation so as to lose heat absorbed during contact with the hot air.
3. 3. Apparatus according to claim 1 or claim 2, wherein the position of said shearing rolls can be vertically adjusted in the frame.
4. 4. Apparatus according to any preceding claim, wherein the separation means comprises a tool whose front part adjacent the shearing rolls is wedge-shaped to completely detach the longitudinal sections.
5. 5. Apparatus according to any preceding claim, wherein said tool is provided with profiles for scraping and chamfering the sharp edges of the separated sections.
6. 6. Apparatus according to any preceding claim, wherein means are provided for cooling said tool during operation so as to reduce wear, and for blowing metal shavings or slag from the tool.
7. 7. Apparatus for hot continuous shearing substantially as herein described with reference to the accompanying drawings.