A method for determining the optimal rough cutting position of steel plates

Abstract

The present invention belongs to the field of machine tool shearing, and relates to a method for determining the optimal rough cutting position of a steel plate. The method comprises the following steps: S1, detecting the size of the steel plate and the length of the tail section by a laser length measuring instrument; S2, determining the shape of the steel plate by a camera and a laser scribing device; the shape of the steel plate includes a straight shape and a curved shape; S3, obtaining the optimal rough cutting position according to the shape of the steel plate, the length of the steel plate and the length of the tail section; specifically comprising: S301, determining the shape of the steel plate; S302, determining whether the length of the tail section is less than or equal to a first preset value; if so, the cutting position is the preset position 1, preset position 2 and preset position 3 of the contract plate; if not, the cutting position is the preset position 1, preset position 2 and preset position 3 of the sub-plate after the number of sub-plates + 1; S303, determining the preset position 1, preset position 2 and preset position 3 according to the shape of the steel plate. This scheme achieves the effect of reducing the shearing loss of the steel plate without increasing the higher equipment cost, and greatly reduces the production cost.

Description

Technical Field

[0001] The invention belongs to the field of machine tool shearing and relates to a method for judging an optimal rough cutting position of a steel plate. Background Art

[0002] Before the steel plate is cooled on the cooling bed, it is necessary to cut the incoming steel plate to be sheared according to the constraints of the mother plate length, plate shape, cooling bed width and subsequent processing technology. The more accurate the rough shearing position in the early stage, the easier it is to complete the subsequent finishing process. On the contrary, if the rough shearing position accuracy in the early stage is too low, it will lead to more waste edges that need to be processed in the subsequent finishing process, which will increase the wear of related processing equipment, increase the cost of equipment maintenance, and reduce production efficiency.

[0003] In order to solve the above problems, the prior art proposes to collect the outer contour and corresponding physical parameters of the steel plate through a device with the function of capturing and processing the outer contour (such as a profilometer), and calculate the maximum rectangularity through an image processing system to accurately obtain the position of the rough shearing. For example, the Chinese patent with the publication number CN111709573A, a method and system for optimal sub-plate planning of hot shearing steel plates to be sheared, collects real-time data of the running steel plates to be sheared, and the real-time data at least includes image data of the steel plates to be sheared and parameter data used to characterize the physical properties of the steel plates to be sheared; according to the image data, obtain the characteristic corner points of the steel plates to be sheared, and then determine the position distribution of the steel plates to be sheared; according to the position distribution of the steel plates to be sheared, obtain the outer contour value of the steel plates to be sheared, and construct a steel plate model; according to the parameter data, generate a standard plate, determine the maximum rectangle used for judgment, and the size of the maximum rectangle is greater than the size of the standard plate; according to the comparison result of the outer contour value and the maximum rectangle, determine and output the optimal sub-plate segmentation position value of the steel plate model. The method and system in this solution make the optimal sub-board segmentation planning, which has reliable detection and fast response speed, effectively avoids production accidents such as short sub-boards, improves production efficiency and reduces production costs caused by maintenance. However, the profiler or equipment with similar functions is very expensive in itself, and although the maintenance cost is reduced, the overall cost is still high. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a method for determining the optimal rough cutting position of a steel plate, which can achieve relatively accurate rough shearing position determination without incurring high equipment costs and improve production qualification rate.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A method for determining an optimal rough cutting position of a steel plate comprises the following steps:

[0007] S1. Use a laser length measuring instrument to detect the size of the steel plate and the length of the tail section;

[0008] S2, judging the shape of the steel plate by using a camera and a laser scribing device; the steel plate shape includes a straight shape and a curved shape; the curved shape includes a head curve and a tail curve;

[0009] S3. Obtaining an optimal rough shearing position according to the steel plate shape, steel plate length and tail section length; the method for obtaining the optimal rough shearing position specifically includes:

[0010] S301, determining the shape of the steel plate;

[0011] S302, determine whether the tail length is less than or equal to a first preset value; if so, the cutting position is the preset position 1, preset position 2 and preset position 3 of the contract board; if not, the cutting position is the preset position 1, preset position 2 and preset position 3 of the sub-board after the number of sub-boards + 1;

[0012] S303, determining the preset position one, preset position two and preset position three according to the shape of the steel plate.

[0013] Further, in S2, the method for determining the shape of the steel plate is:

[0014] S201, setting the laser emission direction of the laser scribing device parallel to the length direction of the steel plate;

[0015] S202, adjusting the distance between the two laser beams of the laser scribing device to the width of the steel plate;

[0016] S203, emitting laser, and capturing the laser irradiation image through a camera;

[0017] S204. If the laser in the laser irradiation image hits the steel plate, the shape of the steel plate is curved; if the laser in the laser irradiation image does not hit the steel plate, the shape of the steel plate is straight.

[0018] Further, in S3, if the shape of the steel plate is judged to be a head bend or a straight shape, the preset position one is at 1 / 2 of the sub-plate, the preset position two is at 1 / 3 of the sub-plate, and the preset position three is at 2 / 5 of the sub-plate; if the shape of the steel plate is judged to be a tail bend, the preset position one is at 1 / 2 of the sub-plate, the preset position two is at 1 / 3 of the sub-plate, and the preset position three is at 3 / 5 of the sub-plate.

[0019] Furthermore, the method for determining the bending shape is: determining whether there is bending and the bending position according to the position of the laser on the laser irradiation image and the relative length of the laser to the steel plate.

[0020] Furthermore, the first preset value is 5m.

[0021] Furthermore, the method further includes detecting the temperature of the steel plate by a pyrometer, and calculating the size of the steel plate under the influence of thermal expansion according to the temperature of the steel plate.

[0022] Glossary:

[0023] Daughter-plate, contract plate and mother plate are special terms and there are differences between them; a large plate during the rolling process is the mother plate, the multiple blocks of finished steel plates sheared out after rolling are the daughter-plate, and the contract plate is a special case of daughter-plate with contract requirements, that is, the same mother plate includes multiple daughter-plates, and the daughter-plates include a contract plate.

[0024] The beneficial effects of the present invention are:

[0025] This solution only needs to add a small amount of low-cost detection equipment to obtain a more accurate optimal shearing position of the steel plate during the rough shearing process, improve the production qualification rate, and compared with the existing technology, it can achieve the effect of reducing the shearing loss of the steel plate without increasing the cost of higher equipment, thus greatly reducing the production cost. At the same time, this solution has fewer operating steps, which simplifies the operation process, has a lower threshold for use than the existing technology, and reduces labor costs.

[0026] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0028] Figure 1 The present invention is a flow chart of a method for determining the optimal rough cutting position of a steel plate according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0030] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order 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 actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0031] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] See also Figure 1 , is a method for determining the optimal rough cutting position of a steel plate, comprising the following steps:

[0033] S1. Use a laser length measuring instrument to detect the size of the steel plate and the length of the tail section.

[0034] S2, judging the shape of the steel plate by using a camera and a laser scribing device; the shape of the steel plate includes a straight shape and a curved shape; S201, setting the laser emission direction of the laser scribing device parallel to the length direction of the steel plate;

[0035] S202, adjusting the distance between the two laser beams of the laser scribing device to the width of the steel plate;

[0036] S203, emitting laser, and capturing the laser irradiation image through a camera;

[0037] S204. If the laser in the laser irradiation image hits the steel plate, the shape of the steel plate is curved; if the laser in the laser irradiation image does not hit the steel plate, the shape of the steel plate is straight; if the steel plate is curved, a method for further determining whether the curved shape is a head bend or a tail bend is as follows: determine whether it is curved and the bending position based on the position of the laser in the laser irradiation image and the relative length of the laser to the steel plate.

[0038] S3. Obtaining an optimal rough shearing position according to the steel plate shape, steel plate length and tail section length; the method for obtaining the optimal rough shearing position specifically includes:

[0039] S301, determining the shape of the steel plate;

[0040] S302, determining whether the tail length is less than or equal to a first preset value; if so, performing the cutting at preset position 1, preset position 2, and preset position 3 of the contract board; if not, performing the cutting at preset position 1, preset position 2, and preset position 3 of the sub-board according to the number of sub-boards + 1;

[0041] S303, determine the preset position one, preset position two and preset position three according to the shape of the steel plate; if the shape of the steel plate is judged to be a head bend or a straight shape, the preset position one is at 1 / 2 of the sub-plate, the preset position two is at 1 / 3 of the sub-plate, and the preset position three is at 2 / 5 of the sub-plate; if the shape of the steel plate is judged to be a tail bend, the preset position one is at 1 / 2 of the sub-plate, the preset position two is at 1 / 3 of the sub-plate, and the preset position three is at 3 / 5 of the sub-plate.

[0042] This solution also includes detecting the temperature of the steel plate by a pyrometer, and calculating the size of the steel plate under the influence of thermal expansion based on the temperature of the steel plate, which is closer to the actual situation, avoids the discrepancy between the actual shearing and the calculation, and makes the rough shearing more accurate.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A method for determining the optimal rough cutting position of a steel plate, characterized in that: The following steps are involved: S1. Use a laser length measuring instrument to detect the size of the steel plate and the length of the tail section; S2. Determine the shape of the steel plate by using a camera and a laser marking device; the shape of the steel plate includes a straight shape and a curved shape; S3. Obtaining an optimal rough shearing position according to the steel plate shape, steel plate length and tail section length; the method for obtaining the optimal rough shearing position specifically includes: S301, determining the shape of the steel plate; S302, determining whether the tail length is less than or equal to a first preset value; if so, the cutting positions are preset positions 1, 2 and 3 of the contract board; if not, the cutting positions are preset positions 1, 2 and 3 of the sub-board after the number of sub-boards + 1; S303, determining the preset position 1, the preset position 2 and the preset position 3 according to the shape of the steel plate; In S2, the method for determining the shape of the steel plate is: S201, setting the laser emission direction of the laser scribing device parallel to the length direction of the steel plate; S202, adjusting the distance between the two laser lines of the laser scribing device to the width of the steel plate; S203, emitting laser, and capturing the laser irradiation image through a camera; S204, if the laser is hitting the steel plate in the laser irradiation image, the shape of the steel plate is curved; if the laser is not hitting the steel plate in the laser irradiation image, the shape of the steel plate is straight; In S3, if the shape of the steel plate is judged to be head-bent or straight, the preset position 1 is 1 / 2 of the sub-plate, the preset position 2 is 1 / 3 of the sub-plate, and the preset position 3 is 2 / 5 of the sub-plate; if the shape of the steel plate is judged to be tail-bent, the preset position 1 is 1 / 2 of the sub-plate, the preset position 2 is 1 / 3 of the sub-plate, and the preset position 3 is 3 / 5 of the sub-plate; The method for judging the bending shape is: judging whether there is bending and the bending position according to the position of the laser on the laser irradiation image and the relative length of the laser to the steel plate.

2. A method for determining the optimal rough cutting position of a steel plate according to claim 1, characterized in that: The first preset value is 5m.

3. The method for determining the optimal rough cutting position of a steel plate according to claim 1, characterized in that: The method also includes detecting the temperature of the steel plate by a pyrometer, and calculating the size of the steel plate under the influence of thermal expansion according to the temperature of the steel plate.

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