CN111581843A - Design method for shape of cross piercing point - Google Patents
Design method for shape of cross piercing point Download PDFInfo
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- CN111581843A CN111581843A CN202010438112.0A CN202010438112A CN111581843A CN 111581843 A CN111581843 A CN 111581843A CN 202010438112 A CN202010438112 A CN 202010438112A CN 111581843 A CN111581843 A CN 111581843A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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Abstract
The invention discloses a design method of a cross-piercing plug shape, which comprises the following steps: 1) performing perforation simulation experiments on different shapes of the nose part and the piercing area of the plug by using a finite element simulation method and analyzing simulation results; 2) obtaining factors influencing the service life of the plug, and constructing a target function according to the factors influencing the service life of the plug; 3) determining the shape of the cross-piercing plug according to the piercing simulation experiment obtained in the step 1) and the analysis simulation result and the objective function obtained in the step 2), wherein the method can unify multiple factors influencing the service life of the plug so as to obtain the shape of the plug with longer service life.
Description
Technical Field
The invention belongs to the field of material processing, and relates to a design method of a cross-piercing plug shape.
Background
In the oblique piercing process, the working environment of the plug is very severe, the plug after use can lose efficacy due to the change of the high-temperature and high-pressure working environment with time, and common failure modes comprise nose deformation, steel sticking, pile pressing and nose collapse, meat biting, steel sticking and cracking in a piercing and rolling area. All failure reasons can not be separated from temperature and pressure, for example, nose deformation of the plug is periodic, the reason is that the nose generates iron oxide scales and generates smaller deformation in the perforation process, and the deformation is more serious or even fails after repeated use; the steel sticking is caused by that the surface temperature of the top head is increased to cause the pipe blank and the top head to be adhered together because the pipe blank generates plastic deformation and generates heat in the piercing and rolling process; pile-pressing and nose collapse are caused by the large resistance of the nose.
The existing method for designing the shape of the plug is to improve the service life of the plug by changing the shape of a part of the plug, such as a plug with a sizing section and a spherical nose part with a long service life, which can shorten the perforation time; or a pressure equalizing plug with a special shape is designed to obtain a plug shape for preventing the rear clamping. It can be seen that the study of the shapes of the piercing plugs by the scholars is single and limited, the comparative analysis is only directed at a certain part of the plugs, and the systematic analysis of various plug shapes is not comprehensive, so that the detailed comparative analysis of the existing plug shapes has certain theoretical and practical significance.
The existing method for designing the plug does not have a systematic design method, and only aims at one factor to design the shape, so that other factors influencing the service life of the plug are ignored.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned drawbacks of the prior art and providing a method for designing a shape of a cross piercing plug, which is capable of unifying a plurality of factors affecting the life of the plug to obtain a plug shape having a longer life.
In order to achieve the above object, the method for designing the shape of the cross piercing point according to the present invention comprises the steps of:
1) performing perforation simulation experiments on different shapes of the nose part and the piercing area of the plug by using a finite element simulation method and analyzing simulation results;
2) obtaining factors influencing the service life of the plug, and constructing a target function according to the factors influencing the service life of the plug;
3) and determining the shape of the cross-piercing plug according to the piercing simulation experiment obtained in the step 1), the simulation result and the objective function obtained in the step 2).
Factors influencing the service life of the plug comprise the plug resistance in the piercing process, the temperature difference of the tube blank in the piercing process, the temperature rise of the tube blank in the piercing process and the pressure resistance degree of the plug.
The constructed objective function is:
f＝ρ1f1+ρ2(f2+3)+ρ3f4(3)
wherein f is1For the resistance of the plug during piercing, f2The temperature difference f of the tube blank in the piercing process3For the temperature rise of the tube blank during piercing, f4To the extent of plug pressure resistance, ρ1、ρ3And rho2Are weights.
The invention has the following beneficial effects:
when the design method of the shape of the cross-piercing plug is specifically operated, a finite element piercing simulation experiment is carried out under the same condition based on the existing plug shape, a simulation result is obtained, a target function is constructed aiming at each factor influencing the service life of the plug, the unification of multiple factors influencing the service life of the plug is realized, the shape of the plug with longer service life is obtained, and the operation is convenient and simple.
Drawings
FIG. 1 is a schematic view of a flat arc centering plug;
FIG. 2a is a schematic view of a piercing plug;
FIG. 2b is a view of the appearance of the tube blank;
FIG. 3a is a schematic view of the shape of a convex plug piercing area;
FIG. 3b is a schematic view of the shape of the bevel-shaped piercing area;
FIG. 3c is a schematic view of the shape of the concave piercing area;
FIG. 3d is a schematic view of the shape of the grooved piercing area;
FIG. 3e is a schematic view of the shape of a flat-centered piercing-rolling zone;
FIG. 3f is a schematic view of the shape of a flat head centered decompression piercing area;
FIG. 3g is a schematic illustration of the shape of the piercing area with constant compressibility of wall thickness;
FIG. 3h is a schematic representation of the shape of the piercing area with constant elongation;
fig. 3i is a schematic diagram of the shape of the cross-sectional constant-compressibility piercing area.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the method for designing the shape of the cross piercing plug according to the present invention comprises the steps of:
performing perforation simulation experiments on different shapes of the nose part and the piercing area of the plug by using a finite element simulation method, and analyzing simulation results, wherein the target function adopts a simple linear weighting method, namely:
f＝ρ1f1+ρ2f2+…+ρnfn(1)
ρ1+ρ2+…+ρn＝1 (2)
wherein f is an optimal target; f. ofnThe characteristic objective function (including the temperature change of the pipe blank, the axial resistance of the plug, the pressure resistance degree of the plug and the like); rhonIs the characteristic objective function weight.
Setting different influence factors as characteristic objective functions, determining the weight of the corresponding characteristic objective function according to the influence degree of each influence factor on the service life of the plug, combining perforation simulation experiments of the plugs with different shapes and analyzing simulation results, wherein the optimal nose shape and the optimal piercing area shape of the plug are obtained when f is the minimum.
Example one
An objective function is constructed from factors affecting the life of the plug as:
f＝ρ1f1+ρ2(f2+3)+ρ3f4(3)
wherein f is1For the resistance of the plug during piercing, f2The temperature difference f of the tube blank in the piercing process3For the temperature rise of the tube blank during piercing, f4The plug pressure resistance was determined.
According to the influence degree of each factor, the distribution weight values are 1/3, 1/6, 1/6 and 1/3 respectively, namely
Formula (3) can be rewritten as:
wherein Q ismaxThe maximum axial resistance value/kN of the pipe billet in the steady rolling process from the contact of the pipe billet with the plug; t is t2The time/s from the contact of the pipe blank with the plug to the steady rolling process of the pipe blank;
the average temperature of the tube blank in the piercing process; t ismaxThe highest temperature of the tube blank in the piercing process; t isminIs the lowest temperature of the tube blank in the piercing process,
the average equivalent strain of the billet is obtained; and S is the contact area of the tube blank and the plug.
When f is smaller, the corresponding plug head shape is optimal, and the service life is longer.
The diameter of a tube blank used in the piercing experiment is 150mm, the tube blank is pierced into a capillary tube with the diameter of 150mm and the inner diameter of 72mm, finite element simulation experiments are carried out on 9 different piercing areas shown in figures 3a to 3i, and the f value of a flat head centering top piercing area is minimum according to simulation results and a combination formula (4), so that the flat head centering top is in the optimal piercing area shape.
The nose part of the plug is in a shape of a pointed head, a sphere, a universal shape, a flat arc shape and a flat head, and the optimal nose part is in a flat arc plug shape.
The optimized top head obtained by combining the results is a flat-arc centering top head, referring to fig. 1, fig. 2a and 2b are diagrams of the top head and a capillary after perforation, and fig. 2a and 2b show that the optimized top head has the advantages that the nose part except the part of the optimized top head gnaws meat, the piercing area is smooth and a uniform protective layer is formed, the shape of the nose part is regular and rounded, and the perforation is facilitated; the diameter difference of the tail part of the capillary head is not large, and the quality is good.
Claims (3)
1. A design method of a cross-piercing plug shape is characterized by comprising the following steps:
1) performing perforation simulation experiments on different shapes of the nose part and the piercing area of the plug by using a finite element simulation method and analyzing simulation results;
2) obtaining factors influencing the service life of the plug, and constructing a target function according to the factors influencing the service life of the plug;
3) and determining the shape of the cross-piercing plug according to the piercing simulation experiment obtained in the step 1), the simulation result and the objective function obtained in the step 2).
2. The method of designing a shape of a cross piercing plug according to claim 1, wherein the factors affecting the life of the plug include a plug resistance during piercing, a temperature difference of the pipe blank during piercing, a temperature rise of the pipe blank during piercing, and a plug pressure resistance.
3. The method of designing a skew piercing plug according to claim 1, wherein the objective function is constructed by:
f＝ρ1f1+ρ2(f2+f3)+ρ3f4(3)
wherein f is1For the resistance of the plug during piercing, f2The temperature difference f of the tube blank in the piercing process3For the temperature rise of the tube blank during piercing, f4To the extent of plug pressure resistance, ρ1、ρ3And rho2Are weights.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010438112.0A CN111581843A (en) | 2020-05-21 | 2020-05-21 | Design method for shape of cross piercing point |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010438112.0A CN111581843A (en) | 2020-05-21 | 2020-05-21 | Design method for shape of cross piercing point |
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| CN202010438112.0A Pending CN111581843A (en) | 2020-05-21 | 2020-05-21 | Design method for shape of cross piercing point |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103886159A (en) * | 2014-04-03 | 2014-06-25 | 东北大学 | DEFORM finite element modeling for seamless steel tube cross piercing process |
| CN106599462A (en) * | 2016-12-14 | 2017-04-26 | 中南大学 | Optimization design method for preforming technology of turbine disk forgings |
| CN107491624A (en) * | 2017-09-20 | 2017-12-19 | 西安建筑科技大学 | A kind of method using the equivalent bolted joint dynamic characteristic of virtual materials |
-
2020
- 2020-05-21 CN CN202010438112.0A patent/CN111581843A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103886159A (en) * | 2014-04-03 | 2014-06-25 | 东北大学 | DEFORM finite element modeling for seamless steel tube cross piercing process |
| CN106599462A (en) * | 2016-12-14 | 2017-04-26 | 中南大学 | Optimization design method for preforming technology of turbine disk forgings |
| CN107491624A (en) * | 2017-09-20 | 2017-12-19 | 西安建筑科技大学 | A kind of method using the equivalent bolted joint dynamic characteristic of virtual materials |
Non-Patent Citations (2)
| Title |
|---|
| 潘柏松;龚惠玲;刘红;: "基于正交试验法的注塑工艺多目标优化设计" * |
| 黄贞益;苏惠超;薛建国;郑坚敏;刘广华;: "斜轧穿孔顶头的有限元模拟及失效分析" * |
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Effective date of registration: 20211028 Address after: 710000 No. 5, Yatu Aviation Industrial Park, No. 2 Road, phase II Planning of Xi'an National Aviation high tech industrial base, Shaanxi Province Applicant after: Xi'an Shengdong Forging Co.,Ltd. Address before: 710055 Yanta Road 13, Xi'an City, Shaanxi Province Applicant before: XIAN University OF ARCHITECTURE AND TECHNOLOG |
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Effective date of registration: 20211209 Address after: 710000 No. 18, Dai Wang, Shan drum Road, Lintong District, Xi'an, Shaanxi. Applicant after: Zhang Runqiang Address before: 710000 No. 5, Yatu Aviation Industrial Park, No. 2 Road, phase II Planning of Xi'an National Aviation high tech industrial base, Shaanxi Province Applicant before: Xi'an Shengdong Forging Co.,Ltd. |
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Effective date of registration: 20220817 Address after: No. 7 Management Committee of Lingbi Economic Development Zone, Lingcheng Town, Lingbi County, Suzhou City, Anhui Province 234228 Applicant after: Anhui Dongyun Intelligent Equipment Manufacturing Co.,Ltd. Address before: 710000 No. 18, Dai Wang, Shan drum Road, Lintong District, Xi'an, Shaanxi. Applicant before: Zhang Runqiang |