KR20230153707A - The system which forms the concave for the curved shell of the hull - Google Patents

Abstract

The present invention relates to a transverse curve forming system for hull curved outer plating. In the present invention, in order to minimize the continuous repetition of 'measurement ~ shipboard heating work' due to 'acceptable error judgment', from the time of calculating the heating position, the tolerance is completely set. Including, by improving the heating position into an 'area with a range' (see Figure 6) rather than a 'point', ultimately maximizing 'the number of heating lines that unconditionally satisfy the allowable tolerance from the beginning'. Flexible design functions for transverse forming and linear heating can be developed.

Description

{The system which forms the concave for the curved shell of the hull}

The present invention relates to a system for forming a transverse curve in the curved outer plating of a ship hull. More specifically, in order to minimize the continuous repetition of 'measurement ~ shipboard heating work' due to 'acceptable error judgment', from the time of calculating the heating position, By including the tolerance, improving the heating position to be 'an area with a range' rather than a 'point', it is possible to maximize the 'number of heating lines that unconditionally satisfy the tolerance from the beginning'. It relates to a transverse curve forming system for hull curves and shell plating that can be used.

Recently, as demand for ship manufacturing has rapidly increased, various technologies that can support the forming of curved hull plating have been widely developed and distributed.

For example, Republic of Korea Patent No. 10-1650590 (name: Method for predicting the development shape of a curved abacus) (announced on August 24, 2016), Republic of Korea Patent No. 10-1570296 (name: Heating device for curved plate forming) ( Announced on November 19, 2015), Korea Patent Publication No. 10-2008-105522 (name: Hull shell curved surface processing system and method) (published on December 4, 2008), Republic of Korea Patent Publication No. 10-2008-100902 ( Name: Triangular heating pattern and path generation system and method) (published on November 21, 2008), Korean Patent Publication No. 10-2012-56567 (Name: Triangular heating heating shape and position determination system and method) (2012.06) An example of conventional technologies related to hull curved shell forming is disclosed in more detail in (released in .04.).

Meanwhile, under this conventional system, the curved shell of a ship is a three-dimensional curved surface designed based on engineering technologies such as fluid dynamics, structural mechanics, and vibration, and is manufactured by processing steel plates of a certain thickness, and the processing precision of the hull shell is determined by the ship's hull plating. It can be said that it determines the overall design performance.

At this time, the three-dimensional shape of the outer plate is largely processed using a two-step method. The two-step method involves mechanical primary cold working using a press or roller, and heat treatment using a gas torch on a steel plate. It is divided into secondary hot processing by pressing.

Cold working is a method of creating curves using a roll press, multi press, or bending press, and is currently mainly used in most shipyards to create developable shapes. This developable shape refers to a shape that can be created by simply bending deformation of a cut flat plate without in-plane contraction or expansion.

Hot working is a process that uses heat sources such as gas torches and high-frequency induction heating devices to apply heat to a steel plate, causing contraction, expansion, and bending deformation to shape the steel plate into a three-dimensional curved shape.

Meanwhile, in Figure 1, the overall work flow diagram of the curved shell forming system is shown, where the dotted box portion is the curved forming portion that performs most of the member forming.

Generally, during the first cold forming operation by a press immediately before hot forming, the principal curvature direction distribution forming the cylinder shape is not parallel as shown in Figure 2, and therefore it is vertically The connecting bending lines are also not in the form of parallel straight lines. This is because several production variables, such as ‘non-uniform load distribution due to press control’ and ‘skill of the operating operator,’ each affect actual work.

In addition, several production variables such as 'non-uniform load distribution by press control', 'skill of operator', etc., during the follow-up operation 'hot bend forming operation', as shown in Figure 3, the deviation of the distribution of heating points It also affects. Therefore, a heating line with all heating points on one straight line cannot realistically exist, and as shown in FIG. 3, the heating line passes between heating points within an appropriate deviation range and heats parts that are not the target heating points.

Additionally, there are heating points outside the deviation range, in which case there is a local shortage of molding volume. Here, the deviation range is within the effective width size of the high-frequency induction heating coil. The meaning of effective width is as shown in FIG. 4.

Due to the inevitable heating position errors and missing heating points that occur during this work process, the linear heating information calculated with the goal of 100% forming accuracy does not achieve the goal, and there is a curved forming error as shown in Figure 5. , if the tolerance is not satisfied after going through the [satisfaction tolerance tolerance for lateral bending] judgment part (box portion) shown in Figure 1, a serious problem occurs in which the process from the measurement process to the heating on board is repeated.

Republic of Korea Patent No. 10-1650590 (name: Method for predicting the development shape of a curved abacus) (announced on August 24, 2016) Republic of Korea Patent No. 10-1570296 (name: Heating device for curved plate forming) (announced on November 19, 2015) Republic of Korea Patent Publication No. 10-2008-105522 (Name: Hull shell shell curved surface processing system and method) (published on December 4, 2008) Republic of Korea Patent Publication No. 10-2008-100902 (Name: Triangular heating pattern and path generation system and method) (published on November 21, 2008) Republic of Korea Patent Publication No. 10-2012-56567 (Name: Triangular heating shape and position determination system and method) (published on June 4, 2012)

Therefore, the purpose of the present invention is to minimize the continuous repetition of 'measurement ~ shipboard heating work' due to 'determination of allowable error', including the allowable error from the time of calculating the heating position, so that the relevant heating position is set in 'point form'. By improving the 'shape of the area with a range' (see Figure 6) rather than ', the bend forming linear heating flexible design function that can ultimately maximize the 'number of heating lines that unconditionally satisfy the tolerance from the beginning' is developing.

Other objects of the present invention will become clearer from the following detailed description and accompanying drawings.

In order to achieve the above object, the present invention includes a curved cross-section frame data generation module for generating curved cross-section frame data; Heating point/heating amount calculation module that calculates the basic heating point and heating amount for each frame data; A continuous heating area calculation module that calculates a continuous heating area that satisfies the lateral curve forming error based on the basic heating point; A shipboard heating line information generation module that generates shipboard heating line information; A shipboard heating line information transmission module that transmits shipboard heating line information to a shipboard heating mechanism; Disclosed is a curve forming system for curved hull shell plating, which includes a ship heating machine that processes a member according to information on the ship heating line and forms a curve in the member.

At this time, the continuous heating area calculation module has the feature of calculating the heating position in the form of an 'area with a range' rather than in the form of a 'point' by including the tolerance when calculating the heating position. .

In the present invention, in order to minimize the continuous repetition of 'measurement ~ shipboard heating work' due to 'tolerance error judgment', from the time of calculating the heating position, the tolerance is included, and the heating position is 'in the form of a point' rather than 'point type'. Because it is calculated/improved in the form of an area with a range (see Figure 6), under the implementation environment of the present invention, the ship producer ultimately maximizes the 'number of heating lines that unconditionally satisfy the allowable tolerance from the beginning'. Flexible design functions such as transverse bending forming and linear heating can be realized.

Figure 1 is an example diagram conceptually showing the curved shell processing procedure of a ship.
Figures 2 to 6 are illustrations to explain the problems of the prior art and the advantages of the present invention compared to the problems of the prior art.
Figures 7 to 23 are illustrations conceptually showing detailed functional performance procedures of the transverse curve forming system for curved hull shell plating according to the present invention.

Hereinafter, with reference to the attached drawings, the transverse curve forming system for curved hull shell plating according to the present invention will be described in more detail as follows.

On the side of the curve forming system for curved hull shell plating according to the present invention, 'a design system that provides member design shapes (curved design shapes)', 'a curved surface matching system that performs a matching procedure of curved design shapes and curved surface measurement shapes', 'members' The procedure for forming a lateral curve in a member is carried out while communicating with the 'measuring system that provides the measured shape (curved surface layer shape)' and the 'vertical curve forming system that forms the vertical curve in the member.'

At this time, as shown in FIG. 7, the transverse curve forming system for curved hull shell plating according to the present invention has a 'curved cross-section frame data generation module that generates curved cross-section frame data' and 'calculates the basic heating point and heating amount for each frame data. 'Heating point/heating amount calculation module', 'Continuous heating area calculation module that calculates the continuous heating area that satisfies the lateral curve forming error based on the basic heating point' (which is a major additional part of the present invention), 'Onboard heating line information It takes a close combination of the ‘ship heating line information generation module’, the ‘ship heating line information transmission module that transmits the ship heating line information to the ship heating mechanism’, and the ‘ship heating mechanism that performs ship heating’. .

First, the curved cross-section frame data generation module proceeds with the procedure of generating measured curved cross-section frame data and designed curved cross-section frame data, as shown in FIGS. 8 to 11.

Under this procedure, the curved section frame data generation module divides the two end edges of the matched design curve (v1~v2, v3~v4) in the Y direction at a certain interval (a) and simultaneously divides them into a plane (T) including the Z axis. ) intersects the design curve and the measurement curve, the intersection of each curve is created as the curved cross-section curve geometry of the design curve and the measurement curve (Nos. 2 to N-1 in FIG. 8).

In addition, in the curved section frame data generation module, the two transverse edges (v1~v4, v2~v3) at both ends of the design curve are themselves created as design curved section geometry, and each design curved section geometry is converted into a measurement curve in the Z direction. Two curves projected for are created as measured curved cross-section geometry (numbers 1 and N in FIG. 8).

In addition, as shown in Figures 9 and 10, the curved section frame data generation module extracts M curve point coordinates at regular intervals (b) from the design curved section curve geometry (including both end points) and then extracts them into the design curved section. Save it in the frame data structure.

Again, each design curved cross-section point is projected in the Z direction with respect to the measured curved cross-section curve geometry, and the obtained M intersection point coordinates are stored in the measured curved cross-section Frame data structure.

At this time, the configuration of the design curved cross-section frame data and the measured curved cross-section frame data is as shown in Figures 10 and 11, and the measured curved cross-section frame data structure includes heating point coordinates and heating amount columns in addition to the curve point coordinates. These values is created and stored in the [Heating point and heating amount for each frame data] step.

Meanwhile, on the heating point/heating amount calculation module side, as shown in FIGS. 12 to 14, the heating point/heating amount is calculated for each measured curve cross-section frame data, and the heating point/heating amount is calculated for each design curve cross-section frame data. The calculation process proceeds.

If a heating point exists within a member, angular deformation occurs that causes the member to bend and rotate around the heating point. If there are multiple heating points (K) on the measured curved cross-section curve, the point coordinates (Pm,i) on the measured curved cross-section frame data are rotated and moved due to the angular deformation of each heating point, and the point coordinates on the designed curved cross-section frame data are changed. gets closer to (Pd,i). In other words, due to K angular deformations, the Z-direction (height direction) deviation (dZi) of the point coordinates of each M designed curved section and measured curved section frame data approaches 0.

Under this situation, the heating point/heating amount calculation module repeatedly calculates the height deviation (dZi) for each case while changing the number and position of the heating points, as shown in FIGS. 12 to 14, and calculates all dZi If the acceptance criteria (tol) are satisfied for (i=1,2,…,M), the heating point coordinates (Ph,j) in that case and the angular strain at each heating point are stored in the measured curved section frame data structure. Save. At this time, the angular deformation amount is stored in the heating amount column. This is performed for all designed curved sections and measured curved sections, and the heating point position coordinates and angular deformation amount for each curved section are stored in each measured curved section frame data structure.

Meanwhile, the continuous heating area calculation module according to the present invention proceeds with the procedure of calculating the continuous heating area that satisfies the lateral curve forming error based on the basic heating point, as shown in FIGS. 15 to 18.

First, when the number of heating points stored in frame I is F, the corresponding Point array {P_h_I} and the required forming amount (angular deformation) array {θ_h_I} are expressed as follows, respectively. Here, the points are numbered in the order of 1, 2,.., F, starting from the largest y-coordinate.

{P_h_I} = {P_I1, P_I2, … ,P_IF}

{θ_h_I} = {θ_I1, θ_I2, … ,θ_IF}

According to the following rule, the allowable heating range of each heating point of frame I is {d_I}={d_I1, d_I2,… ,d_IF} is calculated. A diagram to help understand (1) to (3) described later is shown in Figure 15.

(1) Passing through P_11 of frame 1, an imaginary straight line parallel to the bending line is created.

(2) For frames 2 to N, store the points corresponding to the minimum distance w' between heating lines and the distance between virtual straight lines in 3-1) in a separate array {S_1}. The frame numbers to which the point belongs are I1, I2,… respectively. ,Ik, and in each frame J1,J2,… ,If the Jk points are within the range, {S_1}={S_I1_J1, S_I2_J2,… ,S_Ik_Jk}.

(3) If there is a Point exceeding w' in frame t, {S_1}={S_I1_J1, S_I2_J2,… ,S_t_Jt}, and create a new virtual straight line parallel to the bending line as it passes through the point starting from frame t+1 and perform the process 3-2)~3-3) from frame t+2 to N. Repeat to store {S_2}.

(4) For a certain {S_i} (i=1,2,..), if the interval survey and arrangement storage up to the Point of the N frame are completed, a virtual straight line is created starting from P_12 of the 1st frame and passing through it again. Then, repeat steps (1) to (3). At this time, if the heating point to be irradiated belongs to the already stored {S_i}, the irradiation and interval storage should be omitted.

(5) When the creation of the interval storage array {S_i} between the point and the virtual straight line is completed, {S_i} = {S_i1, S_i2,…, which constitutes each {S_i}. , S_im}, their average interval S_i_avg is calculated and additionally stored.

(6) Each heating point of frame I Point {P_h_I} = {P_I1, P_I2, … , P_IF}, the allowable forming error e and the allowable heating range that satisfies it {d_I}={d_I1, d_I2,… The relational expression of ,d_IF} is calculated as shown in FIG. 16.

Here, the formula for the allowable forming error e is defined as the ratio of the square-mean-square root of the deviation between the cross sections of two compared curves compared to the average size of the target grain (average value of the area under the target grain).

The meaning of the sign function gIk(y) in the equation of FIG. 16 is shown in FIG. 17. gIk is a mathematical device introduced to consistently express the calculation of angular deformation according to the (+) and (-)y signs of the heating point.

(7) At this time, {P_h_I} = {P_I1, P_I2, … , Arrays containing the intervals of each point of P_IF} are stored in {S_I1}, {S_I2},… If ,{S_IF}, the average of the intervals within these arrays is S_I1_avg, S_I2_avg,… ,Expressed as S_IF_avg. At this time, the ratio between each average angle S_I1_avg : S_I2_avg : … : As much as S_IF_avg {d_I}={d_I1, d_I2,… ,d_IF} is also specified as proportional. This is to reasonably determine each allowable range in proportion to the average distribution size of the heating points that exist along the expected heating line direction.

The total sum of each average interval is r=S_I1_avg+S_I2_avg+… If +S_IF_avg, we can calculate the fraction rj = S_Ij_avg/r corresponding to the average interval S_Ij_avg, which is again within the allowable range {d_I}={d_I1, d_I2,… ,d_IF}’s total D=d_I1+d_I2+… When multiplied by +d_IF, the allowable range d_Ij=rj*D can be defined as the ratio between average intervals. Therefore, each {d_I}={d_I1, d_I2,… Since ,d_IF} is a univariate function of only D multiplied by the fraction, D is uniquely determined from the equation in FIG. 16 as shown in FIG. 18.

(8) From D determined in the above process, the allowable range of each heating point of frame I is recalculated as d_Ij=rj*D, and the array {d_I}={d_I1, d_I2,… ,d_IF}. This is repeated for all frames from I=1 to N to store {d_I}.

Meanwhile, as shown in FIGS. 19 and 20, the shipboard heating wire information generation module proceeds with the procedure of generating shipboard heating wire information through each step described later.

Here, each shipboard heating line information is stored in the temporary structure {Ph_line}. An additional explanation of each step is shown in Figure 19.

(1) For the average interval array {S_i} saved in the previous step, the frame heating point points included in the average interval investigation are {P_i}={P_i1, P_i2,... , P_im}, the allowable range interval array calculated in the previous step for each point is {d_i}={d_i1, d_i2, … , d_im}, the virtual Point that is d_ij distance away from each P_ij in the (+)y direction is designated as P_ij_upper, and the virtual Point that is d_ij distance away in the (-)y direction is designated as P_ij_lower.

(2) (+)y direction upper limit point array of each heating point {P_i_upper}={P_i1_upper, P_i2_upper, … , P_im_upper}, (-)y direction upper limit Point array {P_i_lower}={P_i1_ lower, P_i2_ lower, … , P_im_ lower }, the curve connecting each point of {P_i_upper} is called C_upper, and the curve connecting each point of {P_i_lower} is called C_ lower.

Heating point Point {P_i}={P_i1, P_i2, … , P_im}, when the point at the end of the (+)x direction is called P_i_right and the point at the end of the (-)x direction is called P_i_left, they are separated by the allowable range d_i_right and d_i_left in the (+) and (-)y directions. The virtual Points are again called P_i_right_upper, P_i_right_lower, P_i_left_upper, and P_i_left_lower.

If the straight line connecting P_i_right_upper and P_i_right_lower is C_right, and the straight line connecting P_i_left_upper and P_i_left_lower is C_left, the area surrounded by the four curves C_upper, C_lower, C_right, C_left becomes the heating point distribution area R_heat that satisfies the molding tolerance range e.

(3) When the longest straight line among the straight lines existing inside R_heat that is parallel to the bending line is called L_max_heat, the maximum point in the (+)x direction of L_max_heat is called L_max_right, and the maximum point in the (-)x direction is called L_max_left. , these coordinates are designated as the coordinates of both end points of the heating line and stored in {Ph_line}.

Required forming amount (heating amount) of each basic heating point belonging to R_heat {θ_i} = {θ_i1, θ_i2, … , θ_im} is also stored as a pair along with the coordinates of L_max_right and L_max_left in {Ph_line}.

(4) Processes (1) to (3) above are performed on the entire average interval array {S_i} (i=1,2,…) and stored in {Ph_line}.

Meanwhile, the onboard heating line information transmission module communicates with the onboard heating line information generation module, receives the onboard heating line information, and then transmits the received onboard heating line information to the onboard heating mechanical device, as shown in FIGS. 21 and 22. By delivering it, a procedure is carried out to induce a lateral bend to be formed in the member.

Here, the heating point coordinates and heating amounts for each item of the heating line information data structure generated through the above-described linear heating line information generation process become elements constituting one heating line.

(1) Heating start coordinates of the heating line: Coordinates of the first heating point (HL_S)

(2) Heating line end heating coordinate: Coordinate of the last heating point (HL_F)

(3) Heating rate: First calculate the average value of the heating amount (angular strain). The heating rate (v_HL) is calculated from the average value of the heating amount through the function F that calculates the heating rate from the angular strain. Function F is a function that exists inside the heating program. At this time, if the calculated speed is outside the vmin to vmax range set in [Heating limitation conditions], specify vmin or vmax as is. If the heating rate is less than vmin, vmin is designated as the heating rate, and if it is greater than vmax, vmax is designated as the heating rate.

On the shipboard heating line information transmission module side, when HL_S, HL_F, and v_HL are designated for each item of the heating line information data structure, these values are stored in a separate data file so that the shipboard heating machine can read them (see Figures 21 and 22).

At this time, if there are a total of n heating wires stored in the heating wire information data, n dat files are created and classified by number. The file name is specified as [HEATLINE-01.DAT]~[HEATLINE-n.DAT]. On the shipboard heating information transmission module (e.g., PC), when a total of n dat files are converted, they are transmitted all at once to the shipboard heating machine.

The ship heating machine side processes the member according to the above ship heating line information and the additional ship heating line information to form a transverse curve in the member.

Under this procedure, as shown in Figure 23, when the shipboard heating machinery side receives a total of n heating work files of [HEATLINE-01.DAT] to [HEATLINE-n.DAT] from the shipboard heater information transmission module side, 01 Heating operations are performed sequentially from number to n. Heating is performed at the recorded heating rate (v_HL) from the start coordinate (HL_S) recorded in each file to the end coordinate (HL_F).

In this way, in the present invention, in order to minimize the continuous repetition of 'measurement ~ shipboard heating work' due to 'determination of allowable error', from the time of calculating the heating position, the allowable error is included, and the heating position is expressed in 'point form'. Because it is calculated/improved in the form of an 'area with a range' (see Figure 6) rather than a 'range' (see FIG. 6), under the implementation environment of the present invention, the ship producer ultimately calculates and improves the 'number of heating wires that unconditionally satisfies the allowable error from the beginning. It is possible to realize flexible design functions such as transverse forming and linear heating that can maximize '.

This invention has an overall useful effect in various fields that require efficient processing of curved hull plating.

In addition, although specific embodiments of the present invention have been described and shown above, it is obvious that the present invention can be implemented in various modifications by those skilled in the art.

Such modified embodiments should not be understood individually from the technical idea or viewpoint of the present invention, and such modified embodiments should fall within the scope of the appended claims of the present invention.

Claims (2)

A curved cross-section frame data generation module that generates curved cross-section frame data;
Heating point/heating amount calculation module that calculates the basic heating point and heating amount for each frame data;
A continuous heating area calculation module that calculates a continuous heating area that satisfies the lateral curve forming error based on the basic heating point;
A shipboard heating line information generation module that generates shipboard heating line information;
Shipboard heating line information transmission module that transmits shipboard heating line information to the shipboard heating mechanism.
A transverse curve forming system for hull curved shell plating, characterized in that it includes a linear heating mechanical device that processes a member according to the linear heating wire information to form a transverse curve in the member. According to claim 1, the continuous heating area calculation module calculates the heating position in the form of an 'area with a range' rather than in the form of a 'point' by including an allowable error when calculating the heating position. A transverse curve forming system for hull curved shell plating, characterized in that.