CN1529269A - Metal plate cutting auto-discharing method - Google Patents

Abstract

Technical steps of the invention includes as follows: reading out information such as shape, size and material of parts from CAD blueprint of parts, classifying information according to material and thickness, carrying out automatic matching in material warehouse, and fetching out material met requirement; using approach grafting method of maximum space, according to principle of parts not embedded each other, starting material arrangement from left up corner of material; after arranging a part, calculating available maximum space, then comparing with projected area of next part, if the available maximum space covering projected area of part totally, then carrying out automatic material arrangement till the maximum space not covering minimal part. Result being selected from the arranging mode with minimal beta value of residual amount, evaluating the result, output cutting instruction to cut material. The invention raises utilization rate 5%, and efficiency of arranging material.

Description

Panel beating cutting auto-discharing method

Technical field

What the present invention relates to is a kind of auto-discharing method of panel beating cutting, belongs to panel beating cutting technique field.

Background technology

Enterprise needs to carry out materials budget work before the production and processing of product; to determine to consume raw-material quantity; because part is different; carry out blanking by workman's experience at present; often to be on the safe side, can put the blank size of part very wide usually, cause raw-material waste; and the utilization factor of leftover pieces is very low, makes cost of products high.

Summary of the invention

The objective of the invention is to problem, propose a kind of new panel beating cutting auto-discharing method, use this method and can effectively improve the utilization factor of panel beating material and the efficient of discharge at above-mentioned existence.Technical solution of the present invention: the processing step of panel beating cutting auto-discharing method is divided into successively:

The first step reads information such as relevant part shape, size, material on the CAD detail drawing by interface, and classifies by identical material and thickness, mates in the panel beating material depot automatically then, and satisfactory material is taken out, and carries out discharge and calculates.

Second goes on foot, and calculates the area of each part;

The 3rd step, adopt the maximum space inarching method, set up and optimize discharge algorithm mathematics model:

$\mathrm{\β}=\min (L_0\×H-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{S}_i)$

In the formula, β is the materials surplus, and Si is the area of polygonal part, and n is polygonal number, and the region area of rectangle panel beating material is D, and length of material is L, and width is H, suppose discharge as a result the length of materials be L ₀, then this algorithm will be realized: at fixed width is H, and maximum limiting length is among the rectangular area D of L, and arbitrary polygon is carried out discharge, and it is minimum to make that material uses.That is to say and under the prerequisite that does not exceed panel beating material area D, given polygonal part is carried out discharge, make L ₀Minimum.

Constraint condition: any two polygon non-overlapping copies; Do not cross the border in polygonal summit.

Do not embed principle mutually according to part, begin discharge from the upper left corner of panel beating material, after a part discharge is finished, but calculate the maximum space of discharge, then with the projected area of next part relatively, but when the maximum space of discharge fully during the cap piece projected area, automatically be abutted against discharge, but minimum part projected area in can not cap piece up between the maximum emptying, then this panel beating material is set type and is finished, and calculates materials surplus β value.

Can there be a variety of marker methods in the 4th step by above automatic discharge principle, calculated different discharge results' materials surplus β value, determined that minimum materials surplus β value marker method is as the final optimization pass result.

The 5th step, calculate stock utilization, carry out the discharge evaluation of result, utilization factor δ computing function is:

$\mathrm{\δ}=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{S}_i/\underset{k=1}{\overset{m}{\mathrm{\Σ}}}(L_k\×H_k)$

δ in the formula is a utilization factor, S _IBe area of a polygon, n is the number of polygonal part, L _KBe materials length, H _KWidth for materials.M is the number of materials.

The 6th step, the discharge result who is optimized, and output panel beating cutting instruction.

The design drawing of product parts and the panel beating material of corresponding specification are carried out the two-dimension computer auxiliary ingredients, it can be with panel beating material and marker method best in the fastest speed selection enterprise material depot, loss according to the process generation, automatically calculate the product parts Pareto diagram, and mark is gone up size, foundation as blanking processing, simultaneously, automatically count the quantity of material requested, the formation inventory of getting the raw materials ready, reach the purpose that improves raw-material utilization factor to greatest extent, and the discharge result outputed to carry out cutting operation on the cutting machine.

The invention has the beneficial effects as follows, can be in the production blanking, obtain best utilization rate of raw materials and getting the raw materials ready plan easily, for providing the processing of optimizing behind the discharge, cutting machine instructs, improve the efficient and the accuracy of panel beating material cutting processing greatly, reduce the starting material consumed cost.

Accompanying drawing is an embodiment of the invention discharge result schematic diagram.

Embodiment

Embodiment

The first step reads part A1, A2, A3, A4, A5, A6 on the CAD detail drawing, and the panel beating material that is complementary suitable with it is the 45# carbon steel of 5mm; They are that 5000 * 3000 * 5 45# carbon steel panel beating material conforms to specification in the panel beating material depot;

In second step, calculating part A1, A2, A3, A4, A5, the pairing area of A6 are respectively

S1＝5600mm ²，

S2＝11300mm ²，

S3＝8400mm ²，

S4＝7200mm ²，

S5＝14500mm ²，

S6＝4800mm ²；

In the 3rd step, calculate the materials surplus

$\mathrm{\β}=\min (L_0\×H-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{S}_i)$

β in the formula is the materials surplus, and Si is the area of polygonal part, and n is the number of polygonal part, and the region area of rectangle panel beating material is D, and width is H, and the discharge of supposing materials length as a result is L ₀

Adopt the maximum space inarching method to carry out the part discharge, begin discharge from the upper left corner of panel beating material, constraint condition is any two polygon non-overlapping copies, and not crossing the border in polygonal summit, considers certain cutting consumption.After a part discharge is finished, but the maximum space of calculating discharge, and the projected area with next part compares then, but when the maximum space of discharge fully during the cap piece projected area, be abutted against discharge automatically, the rest may be inferred, after whole six parts are all finished discharge, obtain L ₀Value is calculated materials surplus β value with this;

Can there be a lot of marker methods in the 4th step by above automatic discharge principle, calculated different discharge results' materials surplus β value, determined the marker method of minimum materials surplus β value as the final optimization pass result, and materials surplus β value minimum is in this example:

$\mathrm{\β}=\min (L_0\×H-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{S}_i)$

$=200\×300-(5600+11300+8400+7200+14500+4800)=8200$

The discharge result is as shown in drawings:

In the 5th step, carry out the discharge evaluation of result, stock utilization

$\mathrm{\δ}=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{S}_i/\underset{k=1}{\overset{m}{\mathrm{\Σ}}}(L_k\×H_k)$

$=(S1+S2+S3+S4+S5+S6)/L_k\×H_K=(5600+11300+8400+7200+14500+$

$4800)/200\×300=86.3\%.$

M=1 in the following formula;

The 6th step, the discharge result who is optimized, and output panel beating cutting instruction.

Claims (1)

1, panel beating cutting auto-discharing method is characterized in that processing step is divided into successively:

The first step reads information such as relevant part shape, size, material on the CAD detail drawing by interface, and classifies by identical material and thickness, mates in the panel beating material depot automatically then, takes out satisfactory material,

Second goes on foot, and calculates the area of each part;

The 3rd step, adopt the maximum space inarching method, set up and optimize discharge algorithm mathematics model:

$\mathrm{\β}=\min (L_0\×H-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{S}_i)$

In the formula, β is the materials surplus, and Si is the area of polygonal part, and n is polygonal number, and the region area of rectangle panel beating material is D, and length of material is L, and width is H, suppose discharge as a result the length of materials be L ₀, then this algorithm will be realized: at fixed width is H, maximum limiting length is among the rectangular area D of L, arbitrary polygon is carried out discharge, and it is minimum to make that material uses, and that is to say under the prerequisite that does not exceed panel beating material area D, given polygonal part is carried out discharge, make L ₀Minimum;

Constraint condition: any two polygon non-overlapping copies; Do not cross the border in polygonal summit;

Do not embed principle mutually according to part, begin discharge from the upper left corner of panel beating material, after a part discharge is finished, but calculate the maximum space of discharge, then with the projected area of next part relatively, but when the maximum space of discharge fully during the cap piece projected area, automatically be abutted against discharge, but minimum part projected area in can not cap piece up between the maximum emptying, then this panel beating material is set type and is finished, and calculates materials surplus β value;

Can there be a variety of marker methods in the 4th step by above automatic discharge principle, calculated different discharge results' materials surplus β value, determined that minimum materials surplus β value marker method is as the final optimization pass result; The 5th step, calculate stock utilization, carry out the discharge evaluation of result, utilization factor δ computing function is:

$\mathrm{\δ}=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{S}_i/\underset{k=1}{\overset{m}{\mathrm{\Σ}}}(L_k\×H_k)$

δ in the formula is a utilization factor, S _IBe area of a polygon, n is the number of polygonal part, L _KBe materials length, H _xBe the width of materials, m is the number of materials;

The 6th step, the discharge result who is optimized.

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