JPS6115931B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a direct heat treatment apparatus for rolled wire rods.
The spiral coils that come out of the loop forming machine are securely caught one by one so that the loops do not overlap, and are conveyed vertically or at an inclined angle to ensure uniform cooling and control of the spiral coils. The purpose is to reduce strength variations between and within loops and to improve steering stability of equipment.

Direct heat treatment of the wire rod that comes out of the final hot wire rod rolling mill involves blowing a coolant such as air onto the hot rolled wire rod that has been formed into a spiral coil shape in a loop forming machine while being transported by a conveyor. It is carried out with
Regarding this direct heat treatment method, several techniques have already been proposed, and some of them have been put into practical use.

Typical examples include (i) a method in which the spiral coil produced from a loop forming machine is conveyed vertically on a conveyor, and is naturally cooled during conveyance (Japanese Patent Publication No. 18894/1973);

(ii) A method in which a loop of a spiral coil is dropped vertically and controlled cooling is performed during the fall (Special Publication No. 42-
No. 18894, No. 43-25810, No. 45-8536).

(iii) The so-called Stelmor method (Japanese Patent Publication No. 15463/1973) in which spiral coils are stacked non-concentrically on a conveyor and controlled cooling is performed using blast air during conveyance.

(iv) A method in which each loop of a helical coil is supported from inside the coil with a support and transported, and controlled cooling is performed during transport (Japanese Patent Publication No. 31446/1983).

However, in method (i) above, each loop is
Difficult to hold each item vertically,
Since the loop holding mechanism applies an external support force toward the center of the loop at the horizontal diameter position of the loop, the loop may become deformed (the perfect circle may collapse).
However, it is difficult to put into practical use due to the disadvantages that the loading condition after concentration is poor, and the loop itself undergoes creep deformation due to its own weight during adjustment cooling, making the loading condition even worse after concentration. The current situation is that this has not been done. Method (ii) includes a method in which the loop is restrained with support rods or claws in order to prevent the loop from falling due to its own weight, and a method in which the coil is dropped into boiling water and the coil is cooled in a controlled manner by the boiling water. There are various methods, but all of them have the disadvantage that uniform heat treatment cannot be guaranteed because the work is complicated, loops overlap each other, and the cooling effect of the refrigerant is unstable. Method (iii) causes a difference in the cooling rate between the overlapping part of the non-concentric loops and the other parts, making it impossible to perform uniform heat treatment in the circumferential direction of the loop. For wire rods, the variation in tensile strength per loop in lead patenting is within about 2 kg/mm ² , whereas in the case of direct patenting using the same method, a large variation of around 8 kg/mm ² occurs. Note that method (iv) requires extremely large-scale equipment and is therefore hardly ever put into practical use.

In the case of the Stelmor method, as mentioned above, the spiral coils from the loop forming machine are conveyed in a non-concentric manner on a chain conveyor or roller conveyor above the bed, and during the conveyance process, the spiral coils are conveyed from the bottom of the bed. This is a very simple method that performs patenting treatment by adjusting cooling using blast air and has excellent operational stability. However, in this case, because the loops overlap, cooling spots occur, and as a result, the strength decreases. Variations occur, and a product comparable to lead patented material cannot be obtained. In order to solve this problem, measures such as applying a stronger blast only to the overlapped portions, and shifting the overlapped portions of the loops using a baffle roller, etc. during conveyance on a chain conveyor or roller conveyor above the bed have been taken. However, the fundamental reality is that they have not been as effective as lead patented materials.

Therefore, as shown in FIG. 1, a method has been attempted in which the spiral coil loops are conveyed without overlapping to perform controlled cooling. Next, to explain the outline of the direct patenting method, as shown in Figure 1 (the figure [ ] is a side view, [ ] is a XX sectional view, and [ ] is a plan view), the final hot wire A hot rolled wire rod 1 supplied from a rolling mill is formed into a spiral coil 3 by a loop forming machine 2 which rotates around a horizontal axis, and is provided on a side conveyor 4 with pawls 5 etc. between each loop. The sheet is placed on the bed conveyor 6 with the pitch P and the inclination angle α relative to the horizontal axis H being maintained within a certain range, and is transported rightward in the figure. During this transfer, the helical coil 3 is regulated and cooled by a fluid coolant 7, such as air, which is fed from the bottom to the top of the bed conveyor 6, after which it is introduced into a suitable concentrator. The controlled cooling effect during such transfer depends on the pitch between each loop of the helical coil 3 and the refrigerant delivery angle with respect to the helical coil 3. In this case, effective controlled cooling can be obtained and the strength variation can be suppressed to the same level as that of lead patenting material. It is difficult to catch.

In other words, as shown in FIG. 2, it is impossible to bring the loop outlet 8 formed by the guide pipe of the loop forming machine 2 and the position of the claw 5 of the side conveyor 4 close to each other dimensionally. ), the claws 5 can only catch the spiral coil 3, and even if the claws 5 and the loops interfere, there may be a catching error or a plurality of loops may be caught. This is because the loops of the helical coil 3 are not aligned at the proper catching position 9 due to variations in the rotational speed of the loop forming machine 2 or because the loops are stretched to be caught by the previous loop.

As a solution to this problem, the claw 5 should be moved as close as possible to the loop discharge port 8. However, there is a limit in terms of dimensions, so in order to make them even slightly closer, (1) Make the pitch of the claws 5 as long as possible.

(2) Reduce the number of teeth on chain sprocket 10 as much as possible.

(3) Make the length of claw 5 as short as possible.

However, in these cases, the following problems arise. That is, in case (1), the conveyor speed is already too fast and the design is impossible, but it becomes even faster and becomes even more difficult. In the case of (2), reducing the diameter of the chain sprocket 10 is unreasonable in terms of service life since it rotates at high speed. In the case of (3), if the claw 5 is shortened,
There is a risk that the loop may come off from the claw 5 due to creep deformation during the transformation operation due to adjustment cooling during transportation.

Therefore, in order to cope with the future technology of rolling line speed of 100 m/sec, the method shown in FIG. 1 is impossible.

In view of these conventional problems, the present invention aims to continuously convey the helical coil output from the loop forming machine while holding it vertically or inclined in the direction of travel from the outside. A spiral coil inside is forcedly cooled, and its feature is that hot-rolled wire is formed into a continuous spiral coil, and the spiral coil is forcedly cooled while being conveyed. The direct heat treatment equipment for rolled wire rods includes a loop forming machine that forms a hot rolled wire rod into a continuous helical coil, and a loop forming machine that is close to the loop forming machine and that tilts the helical coil vertically or in the direction of travel. a screw conveyor that supports both the right and left sides and the bottom, a chain conveyor that partially overlaps each screw conveyor and supports the spiral coil in a vertical or inclined state, and a chain conveyor that is connected to the chain conveyor and supports the spiral coil. The present invention includes a roller or chain conveyor that horizontally conveys the spiral coils, and an accumulation device located at the final end of the conveyor that accumulates the spiral coils.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. In FIG. 3, reference numeral 11 indicates a hot-rolled wire rod hot-rolled in an up-rolling mill, and reference numeral 12 indicates a hot-rolled wire rod 11 formed into a continuous helical coil 13. With a loop forming machine,
As shown in FIG. 4, the loop forming machine 1 is rotatably supported by a fixed frame 14 via bearings around a horizontal axis, and includes a drive shaft 15, a universal joint 16, a transmission shaft 17, gears 18, 19, 2
It is driven by the power transmitted through 0. Note that the gear 20 is provided integrally with the loop forming machine 1. On the exit side of this loop forming machine 12, a fifth
As shown in the figure, a pair of side screw conveyors 21 are supported on both left and right sides of the spiral coil 13.
and bottom screw conveyor 2 that supports the bottom.
2 is provided in close proximity to the loop forming machine 12 and is rotatable about a horizontal axis. Each side screw conveyor 21 has screw grooves 2 of unequal pitch.
1a, the bottom screw conveyor 22 has screw grooves 22a of equal pitch, and as the screw conveyors 21 and 22 rotate, the spiral coil 13 has a direction of travel of about 30 to 60 degrees with respect to the floor surface. conveyed in an inclined state. Each side screw conveyor 21 includes a drive shaft 15, a universal joint 16, a transmission shaft 17, a reducer 23, as shown in FIGS. 4, 6, and 7.
Bevel gear 24, bevel gear 25, horizontal shaft 2
6. Driven by power transmitted via bevel gear 27, bevel gear 28, vertical shaft 29, bevel gear 30, and bevel gear 31. Further, the bottom screw conveyor 22 is driven via a bevel gear 32 that meshes with the bevel gear 25.
A side screw conveyor 33 is provided so as to partially overlap each side screw conveyor 21, has a large number of pawls 34, and is suspended between a driving sprocket 35 and a driven sprocket 36. Furthermore, this side chain conveyor 33
is located below the side screw conveyor 21. Reference numeral 37 denotes a bottom chain conveyor that is provided so as to partially overlap the bottom screw conveyor 22, and there are a pair of bottom chain conveyors sandwiching the bottom screw conveyor 22 from the left and right sides, each of which has a large number of claws 38.
and is suspended between the drive sprocket 39 and the driven sprocket 40. These chain conveyors 33 and 37 receive and convey the helical coil 13, which has been conveyed in an inclined state by the screw conveyors 21 and 22, as it is. Each drive sprocket 35, 39 is a reducer 23
It is driven from the transmission shaft 41 through the transmission shaft 41. An air blower duct 42 is disposed below the bottom chain conveyor 37, and is used to supply blast air or blast air and mist to the spiral coil 13 during conveyance for controlled cooling. A roller conveyor 43 transports the spiral coil 13 horizontally, and is connected to the chain conveyors 33 and 37, and at the final end of the roller conveyor 43,
An accumulating device 44 for accumulating and bundling the helical coils 1 is provided.

In the above configuration, the helical coil 13 coming out of the loop forming machine 12 is reliably caught for each loop by the side screw conveyor 21 and the bottom screw conveyor 22, and as the screw conveyors 21 and 22 rotate. Transport over time. Then, this spiral coil 13 is transferred to the chain conveyor 33, 37 side at a portion that partially overlaps with the screw conveyors 21, 22, and is approximately 30 to 60 mm long.
The helical coil 13 is sequentially conveyed until it maintains an inclined state of about 100 degrees, and during the conveyance, the spiral coil 13 is adjusted and cooled by blowing air or the like supplied from the air blower duct 42 below. The spiral coils 13 that have passed through the chain conveyors 33 and 37 are laid down on a roller conveyor 43 and sent to a stacking device 44 in a non-concentric stacked state, where they are bundled.

Note that the loop forming machine 12, screw conveyors 21, 22, and chain conveyors 33, 37 are mechanically synchronized. The side screw conveyor 21 uses screws with unequal pitches to convey the helical coil 13 in an inclined state, but the same effect can be achieved even if the loop forming machine 12 itself is inclined; The screw conveyor 21 is of equal pitch. Further, it is preferable that the screw conveyors 21 and 22 have a lead angle as small as possible and have a high surface hardness so as not to damage the wire rods.

The conveying posture of the helical coil 13 is not limited to the inclined state, but may be in the vertical state. Furthermore, a chain conveyor can be used instead of the roller conveyor 43.

As described in detail in the embodiments above, in the present invention, the spiral coils output from the loop forming machine are reliably caught one by one on the screw conveyor and then delivered to the chain conveyor. There is no overlap between the loops, and cooling spots can be prevented from occurring during controlled cooling. Therefore,
There is no variation in strength, and strength comparable to lead patenting material can be obtained. It also has excellent operational stability.

[Brief explanation of the drawing]

Figure 1 is a side view showing a conventional example;
-X sectional view, the same is a plan view, FIG. 2 is an enlarged plan view showing a catching state, FIG. 3 is a plan view showing an embodiment of the present invention, and FIG. 4 is a view taken along the line A-A in FIG. 5 is an enlarged view taken along the line B-B in FIG. 3, FIG. 6 is a view taken along line C-C in FIG. 4, and FIG. 7 is a view taken along line D-D in FIG. 4. 12...Loop forming machine, 13...Spiral coil, 2
DESCRIPTION OF SYMBOLS 1... Side screw conveyor, 21... Bottom screw conveyor, 33... Side chain conveyor, 37... Bottom chain conveyor, 43... Roller conveyor, 44... Accumulating device.

Claims (1)

[Claims] 1. In a direct heat treatment device for rolled wire rods, which forms hot rolled wire rods into continuous helical coils and performs forced cooling while conveying the helical coils, the hot rolled wire rods are formed into continuous helical coils. a screw conveyor that is close to the loop forming machine and supports the left and right sides and the bottom so that the spiral coil is tilted vertically or in the direction of travel; A chain conveyor that supports the spiral coil in a vertical or inclined state, a roller or chain conveyor that is connected to the chain conveyor and transports the spiral coil in a horizontal state, and a roller or chain conveyor that is located at the final end of the conveyor. 1. An apparatus for direct heat treatment of rolled wire, comprising: an accumulation device for accumulating helical coils.