阅读说明：本技术 一种热轧带钢无头轧制中间坯连接装置及方法 (hot-rolled strip steel endless rolling intermediate billet connecting device and method ) 是由 王万慧 韩会全 周民 于 2019-09-04 设计创作，主要内容包括：本发明属于钢铁轧制技术领域,涉及一种热轧带钢无头轧制中间坯连接装置及方法,所述矫直机将中间坯的头、尾矫直成平直端面,采用剪切机将两块中间坯的头、尾切成一定斜边,使其端部对齐,再用接合机对中间坯进行连接；所述接合机的本体固定,其焊接头与中间坯分别以不同速度、向不同方向移动,形成的连接轨迹与中间坯端部斜边结合部轨迹重合,从而实现连接。本发明设备简单、占地面积小,连接强度高、连接范围广,克服了中间坯连接时空间限制的问题,在常规生产线空间有限的条件下实现中间坯的连接,并适用于不同材质板坯间的连接。(The invention belongs to the technical field of steel rolling, and relates to a hot-rolled strip steel endless rolling intermediate billet connecting device and a method, wherein the head and the tail of an intermediate billet are straightened into straight end surfaces by a straightening machine, the head and the tail of two intermediate billets are cut into certain bevel edges by a shearing machine, so that the end parts of the two intermediate billets are aligned, and the intermediate billets are connected by a jointing machine; the body of the jointing machine is fixed, the welding head and the intermediate blank move in different directions at different speeds, and the formed connecting track is superposed with the track of the bevel edge joint part at the end part of the intermediate blank, so that the connection is realized. The invention has the advantages of simple equipment, small occupied area, high connection strength and wide connection range, overcomes the problem of space limitation when the intermediate blanks are connected, realizes the connection of the intermediate blanks under the condition of limited space of a conventional production line, and is suitable for the connection of the plate blanks made of different materials.)

1. A hot-rolled strip steel endless rolling intermediate billet connecting method is characterized by comprising the following steps:

Providing a shearing machine for shearing an intermediate billet, a jointing machine for connecting the intermediate billet and a finishing mill for finishing the intermediate billet, wherein the jointing machine is provided with a welding head;

Cutting head and tail: removing the tail part of the first intermediate blank and the head part of the second intermediate blank by using a shearing machine, and cutting into a certain bevel edge; the bevel edge of the tail part of the first intermediate blank is matched and aligned with the bevel edge of the head part of the second intermediate blank to form a combined part;

Connecting: continuously moving the first intermediate billet and the second intermediate billet towards the finishing mill direction, when the joint part passes through the jointing machine, the welding head of the jointing machine moves at an angle theta with the first direction, the welding track is overlapped with the joint part by adjusting the moving speed and the angle theta of the welding head, the joint part is softened by utilizing the heat generated by the welding head and generates plastic flow, and the first intermediate billet and the second intermediate billet are connected;

The first direction is the moving direction of the first intermediate blank and the second intermediate blank.

2. The method of joining a hot rolled strip endless rolled intermediate slab as claimed in claim 1, further comprising the step of straightening before the step of "end-to-end cutting": and flattening the tail part of the first intermediate blank and the head part of the second intermediate blank after rough rolling by using a straightening machine.

3. the hot rolled strip endless rolled intermediate billet joining method as claimed in claim 1, further comprising, after the step of "joining", the step of deburring: and removing the redundant part formed by the joint by using a deburring machine.

4. The method of joining hot rolled strip endless rolled intermediate billets as claimed in claim 1, wherein the first intermediate billet and the second intermediate billet are synchronized during the step of "joining" at a velocity V₁Moving towards the direction of a finishing mill; velocity V of welding head₂moving, wherein the length of the bevel edge at the tail part of the first intermediate blank is consistent with that of the bevel edge at the head part of the second intermediate blank and is L,And B is the width of the intermediate blank.

5. The method of joining hot rolled strip endless rolled intermediate billets as claimed in claim 4, wherein the direction of movement of the welding head during joining makes an angle θ with the first direction, θ being 80 ° to 100 °, the angle of the oblique side of the tail of the first intermediate billet or the oblique side of the head of the second intermediate billet being α,

6. The method of joining hot rolled strip endless rolled intermediate billets as claimed in claim 5, wherein the bevel angle of the other intermediate billet is β, α + β being 180 °.

7. the method of joining hot rolled strip endless rolled intermediate billets as claimed in claim 5, wherein the direction of movement of the welding head during the joining process is at an angle θ to the first direction, θ being 90 °.

8. the joining method of the endless rolled intermediate slab of hot rolled steel strip as claimed in claim 1, wherein in the step of "joining", the joining machine performs welding by using one or a combination of friction welding, laser welding, and plasma welding.

9. The method for joining hot rolled strip endless rolled intermediate billets as claimed in claim 1, wherein in the step "joining", 1 set or a plurality of sets of welding heads of the joiner are operated simultaneously.

10. The utility model provides a hot rolling belted steel does not have first rolling intermediate billet connecting device which characterized in that: the device comprises a roughing mill, a shearing machine, a jointing machine and a finishing mill, wherein the shearing machine comprises a cutter for shearing an intermediate billet, and a welding head is arranged on the jointing machine; the first intermediate blank and the second intermediate blank move at the same speed and the moving direction is the first direction, the welding head moves at the same speed in the direction forming an angle theta with the first direction and welds the intermediate blanks in the moving process to form a linear joint part track, and the first intermediate blank and the second intermediate blank are connected; the roughing mill, the shearing machine, the bonding machine, and the finishing mill are sequentially arranged in the moving direction of the first intermediate billet.

11. The hot rolled strip endless rolling intermediate billet joining apparatus as claimed in claim 10, wherein: and a hot coil box is arranged between the roughing mill and the shearing machine.

12. The hot rolled strip endless rolling intermediate billet joining apparatus as claimed in claim 10, wherein: and a deburring machine is arranged between the combining machine and the finishing mill.

13. The hot rolled strip endless rolling intermediate billet joining apparatus as claimed in claim 10, wherein: a straightening machine is also arranged between the roughing mill and the shearing machine.

Technical Field

The invention belongs to the technical field of steel rolling, and relates to a hot-rolled strip steel endless rolling intermediate billet connecting device and method.

Background

The endless rolling of the hot-rolled strip steel refers to that the rolled blank is not divided into blocks in the finish rolling stage, strip threading is carried out for one time, continuous finish rolling is carried out, and the rolled strip steel is cut into steel coils with required weight by high-speed flying shears. Compared with conventional hot-rolled single block rolling, endless rolling has the following significant advantages: the unstable part in the rolling process of the strip steel is eliminated, so that the quality is stable, and the yield is improved; the production of ultrathin, wide and thin products can be realized; when rolling thin strip, the production is stable and the productivity is improved; the tension of the strip steel between the frames is kept stable, so that the deviation of the thickness and the flatness of the strip steel is reduced; the threading and tail flicking times are reduced, and the impact and damage to the roller are reduced; the product has more uniform structure performance.

At present, the endless rolling modes of hot rolled strip steel mainly comprise conventional endless hot rolled rolling and endless thin slab continuous casting and rolling. Since the first short-flow CSP production line in the world of 1989 was put into operation in the Nikoco iron and Steel company of America, the development of continuous casting and rolling of thin slabs has become one of the important production modes of hot rolled strips after 30 years, but the technology is mainly applied to a new production line, and the product range is narrower than that of the conventional hot continuous rolling. The conventional hot rolling endless rolling production is superior to the thin slab continuous casting endless rolling in both product coverage and product quality because of the separation of continuous casting and rolling; from the market perspective, the domestic hot rolled plate capacity is seriously surplus, and the opportunity of new projects is few. Therefore, the conventional hot continuous rolling endless rolling production line based on the conventional hot continuous rolling production line is improved, so that the product quality and the production efficiency can be improved, and the aim of high-quality development is fulfilled; the existing hot continuous rolling production line can be more fully used and utilized, and the method conforms to the call of energy conservation and environmental protection.

The existing conventional hot continuous rolling production is changed into endless rolling production, and the most key technical problem is the connection problem of the intermediate blank after rough rolling. Because the endless rolling adopts a belt tension rolling mode, and the second flow of the intermediate billet and the second flow of the finish rolling mill are equal, the connection speed and the quality of the intermediate billet in a hot state influence whether the endless rolling can be realized: if the connection speed is too slow and the connection time is too long, the production efficiency is influenced, and obvious temperature drop is generated, so that the subsequent finish rolling is difficult to perform; if the connection strength is not high and the quality is not good, the strip breakage is easy to occur at the connection part, so that the continuous finish rolling can not be carried out; more importantly, as the conventional hot rolling endless rolling is mainly oriented to the reconstruction of the existing hot continuous rolling production line, and the production line space is fixed, the connecting equipment is not suitable to be large and complex, otherwise, the installation position of the equipment is limited, and the investment and production maintenance cost are increased.

At present, the endless rolling intermediate billet connection method realizes an induction heating connection method, a laser heating connection method and a shearing and pressing connection method which are industrially applied.

the induction heating connection method is a connection technology developed by Kawasaki iron making, and adopts electromagnetic induction heating to generate large induction current at the head and the tail of an intermediate blank so as to heat and raise the temperature of the intermediate blank, and then a joint surface is pressed to complete connection. This connection method requires a connection time of about 20 s. The moving speed matched with the finish rolling procedure needs to be kept in the connection process of the intermediate billet, so that the connection mechanism also needs to keep moving at the same speed as the intermediate billet, according to the moving speed of 1m/s of the existing intermediate billet, the welding can be completed only by moving at least 20m by a huge induction heating mechanism, and the space of the existing hot continuous rolling production line is fixed, so that the moving space of 20m of the connection equipment is met, and the realization is difficult.

the laser heat welding method is a connection technology developed by a new day iron, is similar to an induction heating connection method, and adopts laser heating and then welding. The laser heat welding method also requires the connecting device to move during the connecting process, and thus there is a problem in that the moving space of the connecting device is limited. The shearing and crimping method is a connection technology developed by Mitsubishi Hitachi and Mitsubishi, a specially designed shearing machine is adopted to shear the lapping area of the intermediate billet along the inclined plane, two non-oxidation surfaces are formed by shearing, the newly formed two surfaces move relatively to each other by the shearing force to generate friction, a large amount of heat energy is generated, the diffusion of the surfaces is accelerated, and the shearing machine applies pressure to the inclined plane to form physical combination along the shearing plane while shearing. The shear crimping method can complete the joining of the intermediate blanks within 1s, and therefore the joining apparatus does not need to be moved. However, the connection method is a physical connection by applying pressure to a shearing surface, the connection effect is greatly influenced by the chemical composition of the connection material, and when the content of carbon or other alloy elements in the connection material is high, the connection strength is influenced, so that the connection method can only be used for the connection of low-carbon steel or low-alloy steel at present; meanwhile, the equipment has large volume and length of about 17m because of the requirement of meeting the extremely high pressure required by physical connection, large occupied space and high equipment investment and maintenance cost.

In a word, the intermediate blank connecting mode of the existing application limits the types of produced products except that the connecting application range is narrow, and the most main problem is that a connecting mechanism needs to walk and weld, the occupied space of a production line is large, and the connecting mode is undoubtedly the largest obstruction to the existing production line with fixed space.

Disclosure of Invention

In view of the above, the present invention aims to provide a device and a method for connecting endless rolling intermediate billets of hot rolled strip steel, which have a wide range of steel types and occupy less production line space.

in order to achieve the purpose, the invention provides the following technical scheme:

A hot-rolled strip steel endless rolling intermediate billet connecting method comprises the following steps: providing a shearing machine for shearing an intermediate billet, a jointing machine for connecting the intermediate billet and a finishing mill for finishing the intermediate billet, wherein the jointing machine is provided with a welding head; cutting head and tail: removing the tail part of the first intermediate blank and the head part of the second intermediate blank by using a shearing machine, and cutting into a certain bevel edge; the bevel edge of the tail part of the first intermediate blank is matched and aligned with the bevel edge of the head part of the second intermediate blank to form a combined part; connecting: continuously moving the first intermediate billet and the second intermediate billet towards the finishing mill direction, when the joint part passes through the jointing machine, the welding head of the jointing machine moves at an angle theta with the first direction, the welding track is overlapped with the joint part by adjusting the moving speed and the angle theta of the welding head, the joint part is softened by utilizing the heat generated by the welding head and generates plastic flow, and the first intermediate billet and the second intermediate billet are connected; the first direction is the moving direction of the first intermediate blank and the second intermediate blank.

Optionally, the thickness of the intermediate billet after the step of rough rolling is 25 mm-38 mm, and the temperature is 950 ℃ -1100 ℃.

optionally, before the step of "cutting head and tail", the following steps are further included, straightening: and flattening the tail part of the first intermediate blank and the head part of the second intermediate blank after rough rolling by using a straightening machine.

Optionally, after the step of "connecting", further comprising the step of deburring: and removing the redundant part formed by the joint by using a deburring machine.

Optionally, during the step "joining", the first intermediate blank is synchronized with the second intermediate blank at a speed V₁Moving towards the direction of a finishing mill; velocity V of welding head₂Moving, wherein the length of the bevel edge at the tail part of the first intermediate blank is consistent with that of the bevel edge at the head part of the second intermediate blank and is L,And B is the width of the intermediate blank.

Alternatively, θ is 80 ° to 100 °.

optionally, during the connection process, the moving direction of the welding head is perpendicular to the first direction, the angle of the oblique edge at the tail part of the first intermediate blank or the oblique edge at the head part of the second intermediate blank is alpha,

Optionally, the first intermediate blank and the second intermediate blank are always at a speed V during the connection process₁Moving towards the finishing mill, wherein the moving direction is parallel to the central line of the production line.

Optionally, the bevel angle of the other intermediate blank is β, α + β being 180 °.

Optionally, in the step "joining", the joining machine welds using a combination of one or more of friction welding, laser welding, and plasma welding.

Alternatively, in the step "joining", the heads of the joining machine may work in 1 set, or in multiple sets simultaneously.

A hot-rolled strip steel endless rolling intermediate billet connecting device comprises a roughing mill, a shearing machine, a jointing machine and a finishing mill, wherein the shearing machine comprises a cutter for shearing an intermediate billet, and a welding head is arranged on the jointing machine; the first intermediate blank and the second intermediate blank move at the same speed and the moving direction is the first direction, the welding head moves at the same speed in the direction forming an angle theta with the first direction and welds the intermediate blanks in the moving process to form a linear joint part track, and the first intermediate blank and the second intermediate blank are connected; the roughing mill, the shearing machine, the bonding machine, and the finishing mill are sequentially arranged in the moving direction of the first intermediate billet.

Optionally, a hot box is provided between the roughing mill and the shear.

Optionally, a deburring machine is arranged between the bonding machine and the finishing mill.

Optionally, a straightener is further arranged between the roughing mill and the shearing machine.

Alternatively, the welding heads can adopt 1 or more groups, when a plurality of groups of welding heads are selected, the welding heads are arranged at equal intervals along the connecting track, and the stroke of each welding head is larger than the interval between two adjacent welding heads.

the invention has the beneficial effects that:

The jointing machine disclosed by the invention is used for connecting the intermediate blank in a mode that the body is fixed and the welding head is movable, the jointing machine body does not travel along with the intermediate blank, so that the traveling space of the connecting equipment is reduced, the space of a production line is saved, the occupied area is reduced, the jointing machine can be more widely suitable for the reconstruction of the production line with limited built space, and the investment and maintenance cost of the traveling equipment required by the walking welding of the jointing machine body equipment are saved; the welding mode adopts one or more of several modes such as friction welding, laser welding, plasma welding and the like to be combined, the welding mode is flexible, mature and reliable, and the range of connectable materials is wide.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of an apparatus of the present invention;

FIG. 2 is a schematic view of the apparatus of the present invention in the Z-direction;

FIG. 3 is a schematic view of a bonding portion of the present invention;

FIG. 4 is a schematic view of a bonding machine according to embodiment 1;

FIG. 5 is a view of example 1 in the Z direction from time t to time t + n;

Fig. 6 is a view of example 2 in the Z direction from time t to time t + n.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

Referring to fig. 1-6, the reference numbers in the figures refer to the following elements: 1-second intermediate billet, 2-first intermediate billet, 3-joint, 4-body, 5-welding head, 6-combined area, 7-non-combined area, 8-roughing mill, 9-hot rolling box, 10-straightening machine, 11-shearing machine, 12-clamping device, 13-intermediate billet jointing machine, 14-deburring machine and 15-finishing mill.