CN108465944B

CN108465944B - Nesting path optimization method applied to pipe part common-edge cutting

Info

Publication number: CN108465944B
Application number: CN201810224743.5A
Authority: CN
Inventors: 夏宇锐; 刘洋; 罗少春; 常勇
Original assignee: Foshan Beyond Laser Technology Co Ltd
Current assignee: Guangdong Hongshi Laser Technology Co Ltd
Priority date: 2018-03-19
Filing date: 2018-03-19
Publication date: 2020-03-31
Anticipated expiration: 2038-03-19
Also published as: CN108465944A

Abstract

The invention provides a nesting path optimization method applied to pipe part common-edge cutting, which achieves the purposes of saving pipe raw materials, reducing energy consumption of a laser, assisting gas consumption and reducing the total movement path of a machine tool by optimizing a cutting path on the premise of not changing machine tool equipment, pipe raw materials and processing parts, and has positive significance for improving the section quality of a part product and prolonging the service life of the equipment.

Description

Nesting path optimization method applied to pipe part common-edge cutting

Technical Field

The invention relates to the field of pipe laser processing part nesting, in particular to a nesting path optimization method for pipe part edge sharing cutting.

Background

The laser pipe cutting machine is a special device for cutting, welding, marking, carving, surface treating, fine processing and other technological processes of pipes by using high-energy laser beams. In the laser cutting processing industry, most of the parts need to use automatic nesting software, and after nesting is carried out on the parts on a set pipe, a processing code is output for processing. In most cases, the jacking software can basically obtain a better jacking result, namely, the most parts are jacked on limited materials as far as possible, but the machining path is not necessarily optimal, and particularly, the cutting path between the parts is not optimal, so that the cutting path is long, the equipment loss is large, and therefore, how to optimize the cutting path between the parts during jacking is particularly important, the efficiency and the energy conservation are realized, and the total moving distance of a machine tool is reduced as much as possible.

Common pipe jacking software generally supports a common-edge cutting function, namely, a cutting path is multiplexed between parts as much as possible, for example, the circular pipes are cut off, two circular pipe parts are cut off for 3 times, namely, the tail end of a first part and the head end of a second part are in a common-edge cutting track, and only one cutting is needed. In addition, for beveling without geometric compensation and a section with a notch, common edge processing can be realized through normal optimization, namely, only once truncation is needed. However, when the notches are multiple and variable, no method is available for processing, and in addition, under the condition that geometric compensation is needed in the beveling cutting-off process, the common nesting material does not support the co-edge cutting, and each part in the nesting material needs to be cut at least twice to be cut off. The optimized cutting path is not available, so that the cutting path is long, the equipment loss is large, the efficiency is low, the productivity is seriously influenced, and on the other hand, the pipe is overheated and the processing effect is poor after the parts are repeatedly processed at the joint. Finally, the failure to co-edge results in cutting of excess material, which can result in waste of tubing stock.

Disclosure of Invention

In order to solve the problems, the invention provides a nesting path optimization method applied to the common-edge cutting of pipe parts, which achieves the purposes of saving pipe raw materials, reducing laser energy consumption, assisting gas consumption and reducing the total motion path of a machine tool by optimizing a cutting path on the premise of not changing machine tool equipment, pipe raw materials and processing parts, and has positive significance for improving the section quality of part products and prolonging the service life of equipment, and the specific invention content is as follows:

a nesting path optimization method applied to pipe part common-edge cutting comprises the following steps:

(1) reading and displaying all parts participating in nesting;

(2) traversing the head end faces and the tail end faces of all parts, checking whether notches exist in the contour on the end faces, if the notches do not exist, performing the step (3), and if one or more notches exist, directly jumping to the step (7);

(3) performing non-notch co-edge nesting cutting, analyzing the end face to be cut, performing the step (4) if the end face is a straight-cut end face, and performing the step (5) if the end face is a chamfered end face;

(4) performing common automatic co-edge nesting cutting;

(5) performing beveling co-edge nesting cutting, analyzing whether geometric compensation is needed or not, if so, performing the step (6), otherwise, performing the step (4);

(6) performing advanced three-cutter edge-sharing nesting cutting;

(7) performing step (8) if the slot form is a single-sided single slot or a multi-sided single slot, and performing step (9) if the slot form is a single-sided multi-slot or a multi-sided multi-slot;

(8) sequencing the parts of the trepanning from 1, after the even-numbered parts are turned over in a mirror image mode, aligning notches with notches, and then performing common single-notch common-edge cutting path optimization;

(9) sequencing the parts of the trepanning from 1, after the even-numbered parts are turned over in a mirror image mode, aligning the notches, and then performing advanced island co-edge cutting path optimization;

(10) and (6) ending.

Preferably, for step (9), the advanced island-coterminous cutting path is optimized as follows: the first notch executes the optimization mode of the single-notch common-edge cutting path, and from the second notch, the common edge line of the notches of the left adjacent part and the right adjacent part is continuously cut forwards firstly, then the left notch and the right notch are cut clockwise or anticlockwise, and then the downward cutting is continuously carried out.

Preferably, the specific flow for step (6) is as follows: and cutting the first compensating cutter path, then cutting the second compensating cutter path, and finally cutting the third non-compensating cutting-off cutter path.

Preferably, the structure of the notches may be a square structure, a rectangular structure, an arc structure, a triangular structure or a polygonal structure, and the number of the notches is not limited.

The nesting path optimization method applied to the co-edge cutting of the pipe parts, provided by the invention, has the advantage that the cutting cost is saved to a greater extent through the optimization of the cutting path.

Compared with the traditional common-edge cutting, the path optimization algorithm provided by the invention has great practical value for cutting the pipe with the irregular notch. The traditional common edge cutting can only realize the common edge of the straight cutting end face or the simple single-notch common edge cutting, the path optimization algorithm provided by the invention is greatly improved, the algorithm processing and optimization of the pipe nesting software are required, the notch characteristics are identified, and the cutting path is deleted or added according to the requirements.

The invention has great economic value, and firstly, for expensive numerical control processing equipment and auxiliary cost, the processing path is obviously shortened, so that the processing efficiency can be improved, the consumption of a laser and auxiliary gas is directly reduced, the equipment abrasion is reduced, and the service life of the equipment is prolonged. Secondly, through the optimized common-edge nesting path, more parts can be nested on one pipe, the utilization rate of raw materials is increased, and the loss of the raw materials is reduced. Finally, the optimized common-edge nesting path reduces the thermal denaturation of the pipe when the pipe is cut, can obviously improve the cutting process, and has better end surface quality, easier process debugging and more stable cutting.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a flow chart of a method of the present invention;

FIG. 2 is a plan view of a non-coterminous trepanning cutting path in expanded view;

FIG. 3 is a development view of a cutting path of a common single-notch edge-sharing nesting;

FIG. 4 is a plan view of a single-sided multi-notch non-common-edge cutting trajectory;

FIG. 5 is a planar development of a single-sided multi-notch island common-edge cutting trajectory;

FIG. 6 is a plan development view of a multi-edge multi-notch non-common-edge cutting trajectory;

FIG. 7 is a plan development view of a multi-edge multi-notch island co-edge cutting trajectory;

FIG. 8 is a three-dimensional view of a cutting trajectory of a common bevel edge-sharing nesting;

FIG. 9 is a three-dimensional view of a cutting trajectory of a high-grade three-blade co-edge trepanning with geometric compensation;

fig. 10 is a three-dimensional diagram of a multi-edge multi-notch island co-edge cutting track.

Detailed Description

Fig. 1 shows a flow chart of a nesting path optimization method applied to pipe part co-edge cutting, which mainly comprises the following steps:

a nesting path optimization method applied to pipe part common-edge cutting is characterized by comprising the following steps:

(1) reading and displaying all parts participating in nesting;

(4) performing common automatic co-edge nesting cutting;

(6) performing advanced three-cutter edge-sharing nesting cutting;

(10) and (6) ending.

The advanced island common-edge cutting path optimization method comprises the following specific steps: the first notch is used for executing the single-notch common-edge cutting path optimization mode, but starting from the second notch, the common edge line of the notches of the left and right adjacent parts is continuously cut forwards, then the left and right notches are cut clockwise or anticlockwise, and then the cutting is continuously carried out downwards, so that the advantage that the whole common-edge contour can be finished by cutting without lifting a gun and cutting a knife is achieved.

The situation of no notch, common edge nesting and end surface beveling does not need geometric compensation, and the cutting path is shown in figure 8; the method comprises the following steps of (1) carrying out advanced three-cutter cutting path optimization under the condition that the edge is sleeved without a notch and the end face is beveled and needs geometric compensation, wherein the cutting path is shown in figure 9, a is a compensation cutter path, and b is a non-compensation cutter path; the specific flow of the three-blade cutting is as follows: and cutting the first compensating cutter path, then cutting the second compensating cutter path and finally cutting the third non-compensating cutting-off cutter path.

As shown in fig. 2, without the application of common edges, the total cutting path length:

l-2 (L1+ a + b + c + d + e) 4 (L1+ b), a total of 4 lifts of the gun are required to cut two parts.

As shown in fig. 3, after the single-notch co-edge trim is applied, the paths g 'and h' coincide in space, and the starting point of the cut when cutting the notch is at the midpoint of a 'and f', so the total length of the cut path:

l ' + L1+ a ' + b ' + c ' + d ' + e ' + f ' + g ' + h ' ═ 4 (L1+ b) -a-e, the path is reduced by the distance a + e and it is only necessary to raise the gun three times. Because the common edge is cut by one continuous knife, repeated heating does not exist, the quality of the cut surface is better, and the raw material of the pipe is saved.

As shown in fig. 4, in the case where the common edge is not applied, assuming that b is 2c, the total length of the cutting path is:

l-2 ═ (L1+ a + b + c + d + e + f + g + h) ═ 4 × (L1+ e) +2.54c, a total of 4 lifts of the gun were required.

As shown in FIG. 5, after the multi-notch co-edge nesting is applied, two notches can be cut off by one knife without additionally lifting the gun. Spatially, h 'and g' coincide, with the starting point at the midpoint of a 'and f', so the total cut path length:

L′＝2*L1+a′+b′+c′+d′+e′+f′+g′+h′+i′+j′+k′+l′+m′+n′

L′＝4*(L1+e)+2.54c-(g′+h′+n′-1.27c)

i.e. the cutting path length is reduced: g ' + h ' + n ' -1.27c, and only 3 times of gun lifting is needed, because the cutting is carried out by one continuous knife on the same edge, repeated heating does not exist, the quality of the cut surface is better, and the raw material of the pipe is saved.

As shown in fig. 6, in the case where no common edge is applied, the total cutting path is:

l ═ 2 × (a + b + c + d + e + f + g + h + i + j + k + L + m + n), a total of 4 lifts of the gun are required to cut 2 parts.

As shown in fig. 7, after applying the double-sided multi-notch common-edge trepanning, each end face can be cut off by one knife, and the gun is lifted four times, so that 3 parts can be cut off, because the number of the cut-off parts is one, and the total length of the cutting path is longer than that of fig. 6, if comparison is carried out, the total length of the cutting path in fig. 6 is as follows:

L＝3*(a+b+c+d+e+f+g+h+i+j+k+l+m+n)；

and after applying bilateral many notches to overlap the material altogether, total cutting length:

l ' ═ L + i ' + s ' -g ' -h ' -n ' -q ' -r ' -x '; depending on the slot conditions, the cut length may be increased or decreased. However, a part is cut more, the notches are cut by one continuous knife at the same edge, repeated heating does not exist, the quality of the cut surface is better, the raw material of the pipe is saved, and the motion trail of the double-edge multi-notch sleeve cutting at the same edge is shown in figure 10.

Claims

1. A nesting path optimization method applied to pipe part common-edge cutting is characterized by comprising the following steps:

(1) reading and displaying all parts participating in nesting;

(4) performing common automatic co-edge nesting cutting;

(6) performing advanced three-cutter edge-sharing nesting cutting;

(10) finishing;

the specific flow for the step (6) is as follows: cutting a first compensating cutter path, then cutting a second compensating cutter path, and finally cutting a third non-compensating cutting-off cutter path;

for step (9), the advanced island-co-edge dicing path is optimized to: the first notch executes the optimization mode of the single-notch common-edge cutting path, and from the second notch, the common edge line of the notches of the left adjacent part and the right adjacent part is continuously cut forwards firstly, then the left notch and the right notch are cut clockwise or anticlockwise, and then the downward cutting is continuously carried out.

2. The trepanning path optimization method of claim 1, characterized by: the structure of the notch is a rectangular structure, an arc structure or a polygonal structure.

3. The trepanning path optimization method of claim 1, characterized by: the number of notches is not limited.