Endless direct rolling production device for rods and wires

Abstract

The utility model provides an endless direct rolling production device for bars and wires, which comprises a billet discharge roller way, a hot delivery roller way, a hot delivery roller way and a hot rolling roller way, wherein the billet discharge roller way is used for transporting billets produced by a continuous casting machine; the hot conveying roller way is used for conveying the steel billets to the induction heating device and conveying the steel billets subjected to heat compensation to the first pinch roller; the induction heating device is used for compensating heat of the steel billet to a preset temperature; the first pinch roll is used for adjusting the moving speed of the steel billet; the movable flash welding device is used for welding the front steel billet and the rear steel billet together; the swing roller way is used for supporting the welded steel billet; the second pinch roll is used for providing clamping thrust for the welded steel billet; and the deburring device is used for removing welding burrs on the welded steel billets and conveying the steel billets with the burrs removed to the roughing mill unit. The continuous-cast billets are directly conveyed to the rolling mill through the roller way to be rolled, the tails and the heads of the front billet and the rear billet are welded together in the conveying process, the front billet and the rear billet enter a roughing mill unit as one billet, and therefore endless direct rolling is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of steel rolling, more specifically, to a straight rolling production device for rod wire without head. BACKGROUND

[0002] At present, the headless rolling technology is to heat the continuous casting sizing billet to a certain temperature in a steel rolling heating furnace, and then roll the sizing billet single, wherein the patents related to this technology mainly include the following:

[0003] The invention name is: a long material headless rolling connection method and its rolling production line, patent number CN108405618A, discloses a method for connecting intermediate billets, which connects the front block intermediate billet rolled piece and the rear block intermediate billet rolled piece after passing through the rough rolling mill group through friction welding, and removes the edge burrs at the welding position of the two. This patent process route is to connect the intermediate billets after the rough rolling mill group to realize long material headless rolling, but due to the fast rolling speed after the initial rolling mill group, the welding time is tight, and in addition, headless rolling is also needed, which will inevitably increase the distance between the initial rolling mill group and the intermediate rolling mill group, lengthening the length of the steel rolling workshop, and the current steel rolling production line is basically in continuous rolling form. If the welding system is added between the initial rolling mill group and the intermediate rolling mill group, a large degree of modification is needed, so this way is not conducive to the transformation of old lines.

[0004] The invention name is: a continuous casting-direct rolling device and method for producing rod wire and profile, patent number CN104550237 A, discloses a continuous casting and rolling method for profile rod wire, although the continuous casting and rolling method in this patent cancels the traditional heating furnace, but it still rolls single steel billet, and still has problems such as steel billet gap, short and random size, cutting head and tail for each steel billet, and impact when each rolling mill bites into the steel billet.

[0005] The invention name is: a short process long material headless rolling production line and its rolling method, patent number CN110052495A, this patent cancels the billet cutting machine, accident cooling bed and heating furnace after the continuous casting machine and the straightening and leveling machine, and directly connects the rolling mill for production, but since the production capacity of a rolling line is generally much larger than that of a continuous casting machine, it will inevitably restrict the output of the rolling line; in addition, the rolling speed is also higher than the continuous casting and drawing speed, in order to realize short process headless rolling, the continuous casting machine must have a high drawing speed; in addition, the distance between the continuous casting workshop and the steel rolling workshop in domestic steel plants is generally certain, so this production method must require the continuous casting and the steel rolling workshop to be next to each other, so this way is also not suitable for old line transformation.

[0006] The patent with the title of "continuous casting and rolling device for producing long material" and the patent number of CN202667242U uses roller bottom heating furnace to heat continuous casting blank, although the traditional heating furnace is cancelled, but there are problems of high equipment investment, still consuming more electric energy or fuel in production, and large oxidation loss.

[0007] In summary, based on the patent technology file of the above-mentioned endless rolling technology, it can be concluded that the traditional rolling process has the following shortcomings:

[0008] Firstly, the traditional rolling process must be provided with a heating furnace.

[0009] The energy consumption of the heating furnace is huge, and the fuel consumption of the heating furnace can account for 60% to 70% of the energy consumption of the rolling process; the continuous casting blank is seriously oxidized and burned in the heating furnace, resulting in low material yield; the heating furnace produces a large amount of smoke and waste gas, which is not conducive to environmental protection; the heating furnace occupies a large area, there is a certain danger in the production process, and the investment is large, and the operation and maintenance personnel are many.

[0010] Secondly, the traditional technology has the defects of cutting head and tail, and short and random size.

[0011] The cutting head and tail, and short and random size of a version of rod and wire production line accounts for about 1.5% of the total output, and the material yield is increased by about 1.5% after adopting endless rolling due to the reduction of cutting head and tail, and short and random size.

[0012] Thirdly, the traditional technology has the defect of long interval of steel blank.

[0013] The interval is 3 seconds per rolling of the conventional production, and the interval is cancelled after adopting endless rolling, so the production capacity is increased by 6%, and the annual output is increased.

[0014] Fourthly, the traditional technology has the defect of impact of steel blank on rolling mill.

[0015] Most of the accidents of long material rolling are caused by the impact of steel blank on the rolling mill, and "endless rolling" can greatly reduce the accident rate.

[0016] Fifthly, the traditional technology has the defect of large consumption of spare parts and energy. Practical new type content

[0017] In view of the above problems, the purpose of the present application is to provide a rod and wire endless straight rolling production device to solve the problems of large fuel consumption, high steel blank burning rate, large smoke and waste gas emission, long interval time of each steel blank, short and random size, cutting head and tail of each steel blank, impact of each rolling mill on steel blank, and serious wear of rolling mill, etc.

[0018] The utility model provides a kind of bar wire rod endless straight rolling production device, comprising: the continuous casting machine, blanking roller way, continuous casting cooling bed, hot delivery roller way, induction heating device, first pinch roll, mobile flash welding device, swing roller way, second pinch roll, deburring device, waste blank removing device, clamp broken shear, rough rolling mill group, wherein,

[0019] The continuous casting machine is used for producing steel billets.

[0020] The blanking roller way is used for transporting the steel billets produced by the continuous casting machine to the hot delivery roller way, or transporting the steel billets to the continuous casting cooling bed for offline processing when the steel rolling production line is under maintenance or in an accident.

[0021] The hot delivery roller way is used for delivering the steel billets to the induction heating device and delivering the reheated steel billets to the first pinch roll.

[0022] The induction heating device is used for reheating the steel billets to a preset temperature.

[0023] The first pinch roll is used for clamping the steel billets and adjusting the moving speed of the steel billets.

[0024] The mobile flash welding device is used for welding the front and rear steel billets together.

[0025] The swing roller way is used for supporting the welded steel billets.

[0026] The second pinch roll is used for providing clamping thrust for the welded steel billets.

[0027] The deburring device is used for removing the welding burrs on the welded steel billets and delivering the deburred steel billets to the rough rolling mill group.

[0028] The clamp broken shear is used for clamping and breaking the continuous steel billets.

[0029] The waste billet removing device is used for removing the steel billets that do not enter the rough rolling mill group.

[0030] Preferably, an insulation cover is arranged on the hot delivery roller way, and the insulation cover is used for insulating the steel billets on the hot delivery roller way.

[0031] Preferably, the heating speed of the induction heating device matches the blanking speed of the continuous casting machine.

[0032] Preferably, a clamping system and an adjusting system are arranged on the first pinch roll, wherein,

[0033] The clamping system is used for clamping the steel billets.

[0034] The adjusting system is used for adjusting the moving speed of the steel billets.

[0035] Preferably, the moving speed of the latter steel billet is adjusted by the adjusting system so that the latter steel billet catches up with the former steel billet.

[0036] The latter steel billet is welded together with the former steel billet by the moving flash butt welding device.

[0037] Preferably, an insulation structure is arranged between the swing roller and the bearing seat, and the insulation structure is used for insulation between the steel billet and the swing roller.

[0038] Preferably, the moving speed of the moving flash butt welding device is the same as the bite-in speed of the first rough rolling mill in the rough rolling mill train.

[0039] Preferably, the bite-in speed of the first rough rolling mill is 0.2-0.5 m / s.

[0040] From the above technical solutions, the rod wire endless straight rolling production device provided by the utility model has the following beneficial effects compared with the prior art:

[0041] (1) The device of the utility model can save the energy consumption and operation and maintenance cost of the heating furnace, reduce the production cost, reduce the emission of harmful gases, and is beneficial to environmental protection.

[0042] (2) The device of the utility model can reduce the steel billet burning loss rate, reduce the cutting of head and tail, short and random sizes, improve the material yield, and cancel the steel billet spacing to improve the yield.

[0043] (3) The device of the utility model can reduce the impact of the steel billet on the rolling mill, thereby reducing the accident rate, reducing the consumption of rolling mill spare parts, flying shear blades and guide, eliminating the idle time of the rolling mill, and reducing the consumption of water, electricity, wind and gas energy media.

[0044] To achieve the above and related purposes, one or more aspects of the utility model include the features to be described in detail below. The following description and drawings describe certain exemplary aspects of the utility model. However, these aspects indicate only some of the various ways in which the principles of the utility model can be used. In addition, the utility model is intended to include all these aspects and their equivalents. BRIEF DESCRIPTION OF DRAWINGS

[0045] Other purposes and results of the utility model will be more apparent and easy to understand by referring to the following description in combination with the drawings, and with a more comprehensive understanding of the utility model. In the drawings:

[0046] Figure 1 The rod wire endless straight rolling production device according to the utility model embodiment 1 is shown in the schematic view.

[0047] Figure 2 Figure 1 is a schematic diagram of a conventional bar and wire rod production device;

[0048] Figure 3 Figure 1 is a schematic diagram of a conventional bar and wire rod production device;

[0049] Figure 4 Figure 1 is a schematic diagram of a conventional bar and wire rod production device;

[0050] The reference signs in the drawings include:

[0051] 1, continuous casting machine, 2, billet delivery roller, 3, continuous casting cooling bed, 4, hot delivery roller, 5, heating furnace, 6, induction heating device, 7, first pinch roller, 8, moving flash welding device, 9, swing roller, 10, second pinch roller, 11, deburring device, 12, scrap billet removal device, 13, clamp cutting shear, 14, rough rolling mill.

[0052] The same reference signs in all the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0053] In the following description, for the purposes of providing a thorough understanding of one or more embodiments, numerous specific details are set forth. It is apparent, however, to one skilled in the art that the embodiments can be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate a description of one or more embodiments.

[0054] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0055] In view of the problems of large fuel consumption, high billet burning rate, much smoke and exhaust emission, too long gap time between each billet, short and irregular lengths, each billet needing to be cut at the head and tail, each rolling mill being impacted when biting into the billet, and severe wear of the rolls and guides in the conventional bar and wire rod rolling process, the present application provides a bar and wire rod straight rolling production device.

[0056] The specific embodiments of the utility model will be described in detail below with reference to the drawings.

[0057] In order to illustrate the structure of the rod wire endless straight rolling production device provided by the utility model, Figure 1 、 Figure 2 and Figure 4 rod wire endless straight rolling production device is exemplarily indicated from different angles. Specifically, Figure 1 the structure of the rod wire endless straight rolling production device according to the embodiment 1 of the utility model is shown; Figure 2 the structure of the rod wire endless straight rolling production device according to the embodiment 2 of the utility model is shown; Figure 4 the structure of the rod wire endless straight rolling production device according to the embodiment 3 of the utility model is shown.

[0058] Embodiment 1

[0059] As shown in Figure 1 , the rod wire endless straight rolling production device provided by the utility model comprises: a continuous casting machine 1, a billet discharging roller way 2, a continuous casting cooling bed 3, a hot conveying roller way 4, an induction heating device 6, a first pinch roller 7, a mobile flash welding device 8, a swing roller way 9, a second pinch roller 10, a deburring device 11, a scrap billet removing device 12, a clamping and cutting shear 13 and a rough rolling mill group 14 which are connected in sequence, wherein the continuous casting machine 1 is used for producing a billet; the billet discharging roller way 2 is used for transporting the billet produced by the continuous casting machine 1 to the hot conveying roller way 4, or transporting the billet to the continuous casting cooling bed 3 for offline processing when the steel rolling production line is under maintenance or accident; the hot conveying roller way 4 is used for conveying the billet to the induction heating device 6 and conveying the billet of a preset size after heat supplement to the first pinch roller; the induction heating device is used for supplementing heat to the billet of the preset size to a preset temperature; the first pinch roller 7 is used for clamping the billet of the preset size and adjusting the moving speed of the billet of the preset size; the mobile flash welding device 8 is used for welding two billets of the preset size in front and back together; the swing roller way 9 is used for supporting the billet after welding; the second pinch roller 10 is used for providing clamping thrust for the billet after welding; the deburring device 11 is used for removing the burrs on the billet after welding and conveying the billet after removing the burrs to the rough rolling mill group 14; the clamping and cutting shear 12 is used for clamping and cutting the continuous billet; and the scrap billet removing device 13 is used for removing the billet which does not enter the rough rolling mill group.

[0060] Figure 1 The rod wire endless straight rolling production device shown is applicable to the case that the continuous casting workshop and the steel rolling workshop are not closely arranged or the hot conveying line and the rolling line do not have enough space on the same axis, and is also applicable to the case of old line reconstruction.

[0061] Specifically, the billets produced by the continuous casting machine 1 are fed into the hot conveyor roller table 4 via the billet exit roller table 2. If the billets need to be removed from the line due to rolling mill maintenance or accidents, they are transported to the continuous casting cooling bed 3 for removal. During normal production in the rolling mill, the billets are conveyed by the hot conveyor roller table 4 with an insulation cover. They are then reheated by the induction heating device 6 at an appropriate position. After being reheated to a suitable temperature, they are transported forward to the first pinch roll 7 and then welded by the moving flash welding device 8. The welded billets pass through the swing roller table 9 and the second pinch roll 10, and are deburred by the deburring device 11. The deburred continuous casting billets are then rolled in the roughing mill.

[0062] exist Figure 1 In the illustrated embodiment, unlike traditional devices, the heating furnace is eliminated, allowing the continuous casting and rolling processes to be directly integrated. An induction heating device is added at a suitable location on the conveyor line, transforming the steel billet from a fixed length into an infinitely long billet, enabling uninterrupted rolling. Reheating is performed before entering the furnace to meet the rolling temperature requirements. The connection between steel billets utilizes a moving flash welding device, employing resistance heat generated by the internal resistance and contact resistance of the workpieces to achieve welding. After welding, the weld beads at the weld seam are removed, followed by rolling. Subsequent rolling processes are the same as traditional rolling processes.

[0063] The heating speed of the induction heating device 6 must match the billet output speed of the continuous casting machine and cannot be slower than it. A clamping system and an adjustment system are provided on the first pinch roller 7. The clamping system is used to clamp the steel billet, and the adjustment system is used to adjust the moving speed of the steel billet. When the first pinch roller 7 clamps the steel billet, the moving speed of the steel billet needs to be controlled so that the next steel billet catches up with the previous steel billet, facilitating the movement of the flash welding device 8 to weld the two steel billets together.

[0064] Among them, the mobile flash welding device 8 can be taken offline. If the equipment fails or there are other problems that do not require welding, the mobile flash welding device 8 can be taken offline and replaced by the bypass roller conveyor to allow production to proceed normally. The moving speed of the mobile flash welding device 8 is equal to the biting speed of the first roughing mill in the roughing mill unit 14. The biting speed of the first roughing mill is usually 0.2 to 0.5 m / s.

[0065] Among them, the oscillating roller conveyor 9 serves to support the steel billet, while not affecting the synchronous movement of the moving flash welding device 8 with the steel billet; compared with existing traditional devices, the original roller conveyor is at a fixed height, Figure 1 The oscillating roller conveyor in the illustrated embodiment can oscillate up and down and has insulation characteristics; that is, an insulation structure is provided between the oscillating roller conveyor and the bearing seat, and the insulation structure is used to insulate the steel billet from the oscillating roller conveyor; at the same time, it also serves to support the steel billet, and does not affect the synchronous movement of the moving flash welding device 8 and the steel billet.

[0066] Wherein, the second pinch roll 10 gives the continuous billet a clamping thrust, preventing the continuous billet from being broken at the weld gap; in case of poor welding quality or accident in the later section of the rolling line, the pinch-off shear 13 will pinch off the continuous billet, and the billet not entering the rolling mill is processed by the scrap billet removing device 12.

[0067] Embodiment 2

[0068] As Figure 2 shown, the only difference between the rod wire straight rolling production device of the utility model and the rod wire straight rolling production device in embodiment 1 is that the induction heating device 6 is arranged after the deburring device 11, and this arrangement is suitable for the case that a relatively long section of the hot charging roller way conveying line and the rolling line are on the same axis, or suitable for the case of newly built production line, the continuous casting machine and the rolling line are closely arranged and basically on the same axis.

[0069] Specifically, the fixed-length billet produced by the continuous casting machine 1 is converged to the hot charging roller way 4 by the billet outlet roller way 2; in case of rolling maintenance or accident billet needing to be processed offline, the billet is transported to the continuous casting cooling bed 3 for offline processing; in case of normal production of the rolling workshop, the billet is conveyed by the hot charging roller way 4 with a heat preservation cover, the speed of the billet is controlled by the first pinch roll 7, the next billet is caught up with the previous billet, the front and rear billets are welded together by the movable flash welding device 8, the welded billet is deburred by the deburring device 11 after passing through the oscillating roller way 9 and the second pinch roll 10, the deburred continuous casting billet is heated by the induction heating device 6, and after the temperature is heated to meet the rough rolling mill biting temperature, the billet enters the rough rolling mill group 14 for rolling. In case of poor welding quality or accident in the later section of the rolling line, the pinch-off shear 13 will pinch off the continuous billet, and the billet not entering the rolling mill is processed by the scrap billet removing device 12.

[0070] Embodiment 3

[0071] In Figure 4 the embodiment shown, the existing production line is modified, and the original heating furnace is not removed, and the traditional rod wire production line is modified into a straight rolling production line without head.

[0072] Figure 3 A traditional rod wire production line is shown, specifically: the fixed-length billet produced by the continuous casting machine 1 is converged to the hot charging roller way 4 by the billet outlet roller way 2; in case of rolling maintenance or accident billet needing to be processed offline, the billet is transported to the continuous casting cooling bed 3 for offline processing; in case of normal production of the rolling workshop, the billet is conveyed by the hot charging roller way 4 with a heat preservation cover, enters the heating furnace 5, is heated to an appropriate temperature, and is sent to the rough rolling mill group 14 for rolling, and in case of unqualified billet, the billet is processed by the scrap billet removing device 12.

[0073] As Figure 4The existing production line is modified into a straight rolling line without head, and an induction heating device 6, a first pinch roll 7, a moving flash welding device 8, a swing roller 9, a second pinch roll 10, a deburring device 11 and a clamp cutting shear 13 are added to the traditional bar and wire production line.

[0074] Specifically, the fixed-length billets produced by the continuous casting machine 1 are fed into the hot feeding roller 4 through the billet outlet roller 2. If the rolling maintenance or accident billets need to be offline, the billets are transported to the continuous casting cooling bed 3 for offline processing. When the rolling mill is in normal production, the billets are transported by the hot feeding roller 4 with a heat preservation cover. The induction heating device 6 is arranged at a suitable position of the hot feeding roller line to heat the billets. The hot feeding roller line bypasses the heating furnace 5 and directly connects the rolling line. The first pinch roll 7 controls the moving speed of the billets so that the next billet catches up with the previous billet, and the moving flash welding device 8 welds the two billets together. The welded billets pass through the swing roller 9 and the second pinch roll 10, and then are deburred by the deburring device 11. The deburred continuous casting billets are rolled by the rough rolling mill 14. The billets with poor welding quality or the billets after the rolling line are cut by the clamp cutting shear 13.

[0075] In addition, the specific process of the bar and wire straight rolling production device includes:

[0076] The billets produced by the continuous casting machine are transported to the hot feeding roller through the billet outlet roller;

[0077] The billets are transported to the induction heating device through the hot feeding roller;

[0078] The billets are heated by the induction heating device and then transported to the first pinch roll;

[0079] The moving speed of the next billet is adjusted by the first pinch roll so that the next billet catches up with the previous billet;

[0080] The next billet and the previous billet are welded together by the moving flash welding device;

[0081] The welded billets are transported to the rough rolling mill in sequence through the second pinch roll and the deburring device.

[0082] In the process of heating the billets by the induction heating device, the heating speed of the induction heating device matches the billet outlet speed of the continuous casting machine.

[0083] In the process of welding the next billet and the previous billet by the moving flash welding device,

[0084] The moving speed of the mobile flash welding device is the same as the bite-in speed of the first rough rolling mill in the rough rolling mill group, wherein the bite-in speed of the first rough rolling mill is 0.2-0.5 m / s.

[0085] The steel billets welded together are transported to the rough rolling mill group through the second pinch roll and the deburring device, and the method comprises the following steps:

[0086] The second pinch roll provides a clamping thrust for the welded steel billets;

[0087] The deburring device removes the welding burrs on the welded steel billets, and transports the deburred steel billets to the rough rolling mill group; wherein

[0088] The continuous steel billets with problems are cut off through the cut-off shear;

[0089] The steel billets that have not entered the rough rolling mill group when the rolling production line fails are removed through the scrap billet removal device.

[0090] The above is only an optional embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structural transformation, direct / indirect application in other related technical fields under the concept of the present application, or the contents of the present application specification and drawings are included in the patent protection range of the present application.

Claims

1. A headless direct rolling production apparatus for bar and wire rods, characterized in that, include: The continuous casting machine, billet discharge roller conveyor, continuous casting cooling bed, hot conveyor roller conveyor, induction heating device, first pinch roll, moving flash welding device, oscillating roller conveyor, second pinch roll, deburring device, scrap removal device, shearing device, and roughing mill are connected in sequence. The continuous casting machine is used to produce steel billets; The billet delivery roller conveyor is used to transport the steel billets produced by the continuous casting machine to the hot delivery roller conveyor, or to transport the steel billets to the continuous casting cooling bed for processing when there is maintenance or accident in the steel rolling production line. The hot conveying roller conveyor is used to transport the steel billet to the induction heating device and to transport the reheated steel billet to the first pinch roller; The induction heating device is used to reheat the steel billet to a preset temperature; The first pinch roller is used to clamp the steel billet and adjust the moving speed of the steel billet; The mobile flash welding device is used to weld two steel billets together. The oscillating roller conveyor is used to support the welded steel billet; The second pinch roll is used to provide a clamping thrust for the welded steel billet; The deburring device is used to remove welding burrs from the welded steel billet and to transport the deburred steel billet to the roughing mill. The shearing device is used to cut continuous steel billets. The scrap removal device is used to remove steel billets that have not entered the roughing mill.

2. The bar and wire rod endless direct rolling production apparatus according to claim 1, characterized in that, A heat preservation cover is provided on the hot conveying roller conveyor to keep the steel billet on the hot conveying roller conveyor warm.

3. The bar and wire rod endless direct rolling production apparatus according to claim 1, characterized in that, The heating rate of the induction heating device is matched with the billet output rate of the continuous casting machine.

4. The bar and wire rod endless direct rolling production apparatus according to claim 1, characterized in that, A clamping system and an adjusting system are provided on the first pinch roller, wherein... The clamping system is used to clamp the steel billet; The adjustment system is used to adjust the moving speed of the steel billet.

5. The bar and wire rod endless direct rolling production apparatus according to claim 4, characterized in that, The adjustment system adjusts the moving speed of the next billet so that the next billet catches up with the previous billet. The moving flash welding device is used to weld the next steel billet together with the previous steel billet.

6. The bar and wire rod endless direct rolling production apparatus according to claim 1, characterized in that, An insulating structure is provided between the oscillating roller conveyor and the bearing housing, the insulating structure being used to insulate the steel billet from the oscillating roller conveyor.

7. The bar and wire rod endless direct rolling production apparatus according to claim 1, characterized in that, The moving speed of the mobile flash welding device is the same as the bite speed of the first roughing mill in the roughing mill unit.

8. The bar and wire rod endless direct rolling production apparatus according to claim 7, characterized in that, The bite speed of the first roughing mill is 0.2 to 0.5 m / s.

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