阅读说明：本技术 一种连续带钢生产线二次剪切月牙的焊缝处理方法 (Welding seam processing method for secondary shearing crescent of continuous strip steel production line ) 是由 何立军 查凯 刘闯 林建民 纪召红 郭小春 刘希国 韩冬 徐刚 陈世和 于鹏 于 2019-10-21 设计创作，主要内容包括：本发明涉及一种连续带钢生产线二次剪切月牙的焊缝处理方法,不改变产线原定一次剪切的工作程序,在该一次剪切的基础上通过合理的算法和程序控制,第二次剪切月牙时,带钢只向前进,月牙剪是向背离带钢中心方向运行,自动控制效率更高,能实现对月牙自由端的宽厚比的有效控制,通过二次剪切月牙充分降低月牙处带头自由端的宽厚比,有效避免月牙在后续高速运行过程中被设备碰伤,从而保证生产过程连续高效进行；通过精确控制二次剪切月牙时月牙剪运行时序、带钢运行时序,将二次剪切月牙时间控制在最小范围,降低对产线连续运行的影响；可推广应用到连续退火、连续热镀锌、连续镀锡等布置有焊机的带钢连续生产线。(The invention relates to a welding seam processing method of a secondary shearing crescent of a continuous strip steel production line, which does not change the original primary shearing working program of the production line, and is controlled by a reasonable algorithm and a program on the basis of the primary shearing, when the crescent is sheared for the second time, strip steel only moves forwards, and the crescent shear moves towards the direction away from the center of the strip steel, so that the automatic control efficiency is higher, the effective control of the width-thickness ratio of the free end of the crescent can be realized, the width-thickness ratio of the free end of a belt head at the crescent is fully reduced by secondarily shearing the crescent, and the crescent is effectively prevented from being damaged by equipment in the subsequent high-speed operation process, thereby ensuring the continuous and efficient operation of the production process; the running time sequence of the crescent scissors during the secondary crescent shearing and the running time sequence of the strip steel are accurately controlled, so that the secondary crescent shearing time is controlled in a minimum range, and the influence on the continuous running of a production line is reduced; the method can be popularized and applied to continuous strip steel production lines with welding machines, such as continuous annealing, continuous hot galvanizing, continuous tinning and the like.)

1. A welding line processing method for a secondary shearing crescent of a continuous strip steel production line is characterized by comprising the following steps:

1) width b₁And b₂After the front and the back strip steels are welded, the electric control system drives the strip steels to move forwards, and when the welding line is positioned at the transverse central position of the crescent shears, the shear blades at the two sides of the crescent shears move forwards from the waiting position S₁＝(S₀-b₁)/2+b₃When the distance reaches the shearing working position, executing one shearing action; wherein S₀The widest distance between the cutting edges at the two sides of the crescent shear when the crescent shear is positioned at the waiting position, b₃In order to realize the cutting of the width of the crescent inner weld joint;

2) the crescent shears are opened and retreated S₃＝S₂/2＝(b₂-b₁+2*b₃) A distance of/4 to a secondary shear wait bit;

3) the electric control system drives the strip steel to move forward by a distance d equal to L, wherein L is the inner length of the crescent shear, and the crescent shear performs secondary shearing action after the strip steel stops;

4) the crescent shears are opened and move back directly by S4 ═ S₀-b₁+b₃) 2 arrive at wait bit;

5) and starting the production line to normally run.

Technical Field

The invention belongs to the technical field of continuous strip steel production line equipment, and particularly relates to a weld joint processing method for secondary shearing crescent of a continuous strip steel production line.

Background

The welding machine is one of main devices of a continuous strip steel production line, is mainly responsible for connecting a steel coil head and a steel coil tail to realize the function of continuous strip steel production, and is widely applied to continuous strip steel production lines such as a continuous annealing line, a continuous hot galvanizing line, a continuous tinning line and the like.

Crescent shear equipment is generally arranged behind a welding machine, and the crescent shear equipment is mainly used for shearing crescent at a welding seam, realizing smooth transition of a belt head and a belt tail, eliminating stress concentration and avoiding tearing of the welding seam in a subsequent operation process, or scraping by the equipment, or damaging the equipment. Meanwhile, the cut crescent can be used for a cup convex test and used as a basis for judging whether the welding seam is qualified or not.

In order to realize the purpose, the width of a welding line in the crescent is generally not less than 40mm, the wide specification strip steel is in narrow connection, and the crescent shearing of the wide specification part can be generally as large as 200 mm.

Generally, after welding is finished, the crescent shears cut a crescent at the position of a welding seam once, and the free end of the belt head is generally 40mm-200mm wide. Researches show that when the width-thickness ratio of the free end of the belt head is more than 100 and the running speed is higher than 150m/min, the crescent at the welding seam is easily scratched by equipment in the subsequent running process. When the steel wire rope passes through subsequent equipment such as a planisher and a circle shear, the machine must be stopped, and the damaged crescent cannot safely pass through the equipment, so that serious production accidents such as belt breakage are easily caused, and the production efficiency is seriously influenced.

The invention discloses a control method for strip steel edge punching by a crescent shear, which aims to overcome the problem that the width difference range of the strip steel is limited by the crescent shear with the fixed specification and the edge punching quality of the strip steel is influenced, on the basis of the first crescent moon shearing, the purpose of increasing the width transition range of the strip steel is realized by continuing feeding towards the center direction of the strip steel and performing secondary shearing, the control method is only suitable for narrow-joint wide specifications and wide-joint narrow specifications, the width-thickness ratio of a crescent free end cannot be strictly controlled, and the problem that the crescent at a welding joint is easily scratched by equipment in the subsequent operation when the width-thickness ratio of the free end of a strip head is more than 100 and the operation speed is higher than 150m/min cannot be solved.

Disclosure of Invention

The invention aims to provide a welding line processing method for secondarily shearing crescent in a continuous strip steel production line, which realizes automatic secondary shearing of crescent by accurately controlling a welding line crescent shearing mode, reduces the freedom degree of strip steel at the crescent in the width direction, reduces the vibration of the strip steel at the crescent in the high-speed running process, avoids damaging the strip steel, protects equipment and the strip steel, and ensures continuous, efficient and stable running of the production line.

The twice-shearing crescent moon is based on a conventional once-shearing crescent moon processing mode, and on the basis, the once-shearing crescent moon is sheared again by adopting an electric automatic control means, so that the crescent moon sample can meet the requirements of a cup bulge test, and the crescent moon position of a welding line can be prevented from being damaged.

The above-mentioned conventional crescent shearing treatment is generally as follows:

after the front and rear band steels with the widths of b1 and b2 are welded, the electric control system drives the band steels to move forward, when the welding seam reaches the transverse central position of the crescent shears, the shear blades on the two sides of the crescent shears are located at a waiting position, and the distance of the widest position is S₀And simultaneously, the upper and lower shearing blades are in an open state, and feed is carried out towards the longitudinal center position (for convenience of expression, the action of feeding the crescent shears towards the longitudinal center position of the strip steel is called forward, and the action of feeding the crescent shears towards the longitudinal center position of the strip steel is called backward in the opposite direction).

The width of a welding seam in a shearing crescent is b₃Then the crescent scissors on both sides need to advance S₁＝(S₀-b₁)/2+b₃Reaches the cutting working position, and performs the cutting action.

After the crescent is cut, the crescent is opened and directly retreats S₁＝(S₀-b₁)/2+b₃Reaches the wait bit.

The width-thickness ratio of the free end of the belt head at the once-shearing crescent position of the rear belt connecting steel can be calculated to be S₂/h₂＝(b₂-b₁+2*b₃)/2/h₂If the value is more than 100, when the running speed is higher than 150m/min, the crescent at the welding seam is easily scratched by equipment in the subsequent running.

The crescent is cut twice, namely after the crescent is cut and the crescent is opened, the crescent is not retreated to the waiting position but is retreated by S₃＝S₂/2＝(b₂-b₁+2*b₃) Distance of/4 to double clipping wait bit.

After the crescent shears retreat to the secondary shearing waiting position, the electric control system drives the strip steel to move forward by a distance L (assuming that the inner length of the crescent shears is L), and after the strip steel stops, the crescent shears execute shearing action again.

After the second shearing of the crescent is finished, the crescent is opened and directly retreats S₄＝(S₀-b₁+b₃) And 2, when the production line arrives at the waiting position, starting the production line to normally run.

The technical scheme adopted by the invention for solving the technical problems is as follows: a welding line processing method of a secondary shearing crescent of a continuous strip steel production line comprises the following steps:

1) when the welding seam is positioned at the transverse central position of the crescent shears, the cutting edges at the two sides of the crescent shears advance from the waiting position by S₁＝(S₀-b₁)/2+b₃When the distance reaches the shearing working position, executing one shearing action;

2) the crescent shears are opened and retreated S₃＝S₂/2＝(b₂-b₁+2*b₃) A distance of/4 to a secondary shear wait bit;

3) the electric control system drives the strip steel to move forward by a distance d equal to L (assuming that the inner length of the crescent shear is L), and after the strip steel stops, the crescent shear performs secondary shearing action;

4) the crescent shears are opened and directly retreat S₄＝(S₀-b₁+b₃) 2 arrive at wait bit;

5) and starting the production line to normally run.

The invention has the following beneficial effects: (1) according to the invention, the original primary shearing working program of the production line is not changed, reasonable algorithm and program control are adopted on the basis of the primary shearing, when the crescent moon is sheared for the second time, the strip steel only moves forwards, the crescent moon shears move in the direction away from the center of the strip steel, the automatic control efficiency is higher, the effective control of the width-thickness ratio of the free end of the crescent moon can be realized, the width-thickness ratio of the free end with the head at the crescent moon position is fully reduced by shearing the crescent moon for the second time, the crescent moon is effectively prevented from being damaged by equipment in the subsequent high-speed operation process, and the continuous and efficient operation of the production process is ensured; (2) the running time sequence of the crescent scissors during the secondary crescent shearing and the running time sequence of the strip steel are accurately controlled, so that the secondary crescent shearing time is controlled in a minimum range, and the influence on the continuous running of a production line is reduced; (3) the method can be popularized and applied to continuous strip steel production lines with welding machines, such as continuous annealing, continuous hot galvanizing, continuous tinning and the like.

Drawings

FIG. 1 is a schematic view of a working path of a crescent moon shears;

FIG. 2 is a schematic view of a secondary shear weld crescent;

FIG. 3 is a flow chart of a weld processing method of a double shearing crescent.

In the figure, 1, forward strip steel, 2, rear strip steel, 3, welding seams, 4, a crescent shear central line, 5, a strip steel central line, 6, a transmission side crescent shear, 7 and an operation side crescent shear.

Detailed Description

The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the scope of the present invention is not limited to these examples. All changes, modifications and equivalents that do not depart from the spirit of the invention are intended to be included within the scope thereof.

As shown in figures 1-3, the weld seam processing method based on the secondary shearing crescent of the continuous strip steel production line is used for a certain continuous hot galvanizing unit group.

Thickness h₁0.4mm, width b₁1250mm forward strip steel and rear strip steel with the specification of thickness h₂＝0.4mm，b₂＝1300mm。

The inner length L of the cutting edge of the crescent shears is 400 mm.

The width of the inner weld of the once-cut crescent sample is b₃＝40mm。

The cutting edges at both sides of the crescent shear are positioned at a waiting position, and the distance at the widest position is S₀＝2100mm。

When the electric control system drives the strip steel to advance and the to-be-welded seam reaches the transverse central position of the crescent shears, the shear blades on two sides of the crescent shears feed towards the longitudinal central position, and the crescent shears on two sides need to advance S₁＝(S₀-b₁)/2+b₃When the distance of 465mm reaches the cutting working position, the cutting action is executed.

The width-thickness ratio of the free end of the belt head at the once-shearing crescent position of the rear belt connecting steel can be calculated as (b)₂-b₁+2*b₃)/2/h₂162.5, the width-thickness ratio of the free end of the belt head is more than 100, and when the running speed is higher than 150m/min, the crescent at the welding seam is easily scratched by equipment in the subsequent running.

After the crescent is cut once, the crescent is opened and retreated S₃＝S₂/2＝(b₂-b₁+2*b₃) Distance to double shear wait bit of 32.5 mm/4.

And then the electric control system drives the strip steel to move forward by a distance d equal to L equal to 40 mm.

After the strip steel stops, the crescent shears execute shearing action again.

The width-thickness ratio of the free end of the belt head at the crescent position of the secondary shearing of the rear connecting belt steel is calculated as (S)₂-S₃)/h₂＝81.25。

Meanwhile, the width-thickness ratio of the belt head free end at the original one-time shearing crescent is S₃/h₂＝81.25。

The width-thickness ratio of the free end of the belt head is less than 100, so that the belt head can be prevented from being scratched by equipment in subsequent operation, and the continuous and efficient production process is ensured.

Therefore, the whole secondary shearing process is completed, and the production line can be started to normally run.

The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.

The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.