CN110315741B - Method for correcting ellipticity of PE pipe fitting in sectional manner - Google Patents

Method for correcting ellipticity of PE pipe fitting in sectional manner Download PDF

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CN110315741B
CN110315741B CN201910570023.9A CN201910570023A CN110315741B CN 110315741 B CN110315741 B CN 110315741B CN 201910570023 A CN201910570023 A CN 201910570023A CN 110315741 B CN110315741 B CN 110315741B
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pipe fitting
ovality
pipe
modeling
shrinkage
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CN110315741A (en
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王志伟
孙祥瑞
吴志峰
丁永跃
左添源
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Shanghai George Fischer Chinaust Plastics Fittings Corp ltd
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Shanghai George Fischer Chinaust Plastics Fittings Corp ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/16—Straightening or flattening
    • B29C53/20—Straightening or flattening of tubes

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  • Injection Moulding Of Plastics Or The Like (AREA)
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Abstract

The application discloses a method for correcting ovality of a PE pipe fitting in a sectional mode, and relates to production of the PE pipe fitting. The utility model provides a method of PE pipe fitting ovality is revised to festival segmentation, through the various factor factors that analysis influences the ovality, adopts numerical value condition simulation analysis ovality factor to the core shaft and the die cavity of PE pipe fitting mould are carried out the predeformation design to festival segmentation, revise the ovality, carry out injection moulding's method again, and the ovality of effectual control PE pipe fitting can once only produce qualified PE pipe fitting product, has improved the quality and the production and the installation effectiveness of PE pipe fitting simultaneously. Compared with the prior art, the method for correcting the ovality of the produced PE pipe fitting is carried out. The method for producing the PE pipe fitting is stable in product quality, simple in process and capable of saving a large amount of manpower and material resources. In addition, use this application, reducible mould examination mould time, and then shorten the development time of PE pipe fitting product.

Description

Method for correcting ellipticity of PE pipe fitting in sectional manner
Technical Field
The application relates to production of PE (polyethylene) pipe fittings, in particular to a method for correcting ovality of PE pipe fittings in a sectional manner.
Background
The PE pipeline is widely applied to the fields of buried gas, water supply, pressure drainage, underground environment-friendly pollution discharge, chemical fluid, mines and the like. The PE pipeline comprises a PE pipe fitting and a PE pipe material. The PE pipe fitting is formed by plasticizing PE plastic particles through an injection molding machine and then forming a PE pipe fitting product in a mold under certain conditions. The ovality of the PE pipe fitting has great influence on the installation and connection effects of the pipe fitting. Each section of the tubular portion or insertion depth portion of the PE pipe affects the fitting and welding of the pipe. Ovality is therefore a major parameter for quality control of PE pipe. In order to improve the production efficiency of PE pipe fittings, multi-cavity dies are increasingly applied, and the ovality of products with different cavities in the multi-cavity dies is required to be consistent.
At present, the quality of PE pipe fittings in the market is uneven, when the ovality of the PE pipe fittings is excessive, the PE pipe fittings can not be assembled in the construction process, and operators need to use corresponding tools and fixtures to correct the PE pipe fittings on site and then assemble the PE pipe fittings, so that the construction is difficult. The recessive factor of the out-of-ovality causes the failure of the welding result.
At present, the ovality of the PE pipe fitting is corrected, the PE pipe fitting is hot, and the PE pipe fitting produced immediately is pressed or supported by a clamp by utilizing the characteristic that the PE can deform. This method is troublesome and has limited effects.
Disclosure of Invention
It is an object of the present application to overcome the above problems or to at least partially solve or mitigate the above problems.
The application provides a method for correcting ovality of a PE pipe fitting in a sectional mode, which is operated according to the following steps:
step 1, obtaining the maximum ovality value allowed by a PE pipe fitting, and identifying factor factors influencing the ovality;
step 2, selecting proper equipment and parameters matched with the equipment according to the number and the weight of the PE pipe fitting model cavities;
step 3, determining a physical property table of a raw material for producing the PE pipe fitting;
step 4, modeling a PE pipe fitting model with compatible mold flow;
step 5, setting the division type and loading of the model mesh;
step 6, carrying out simulation analysis according to preselected factor factors influencing ellipticity;
step 7, solving the change trend of the ovality of the PE pipe fitting and the change value of each curved surface circle;
and 8, carrying out reverse compensation design on the mandrel and the cavity insert of the die according to the change value of each curved surface circle to solve the correction ovality, and carrying out pre-deformation correction by a sectional method, wherein the sectional method is to divide the PE pipe into a plurality of different length sections in the cross section circle of the functional area.
Optionally, in the step 1,
the ovality formula of the PE pipe fitting is as follows:
Figure GDA0002858203880000021
wherein e is ovality, dMaxIs the maximum diameter of the cross-section circle of the PE pipe fitting, dMinThe minimum diameter of the cross section circle of the PE pipe fitting, and dn is the nominal diameter of the pipe fitting;
the shrinkage unevenness of the PE pipe is the main reason for the ovality of the PE pipe, and the main factor factors influencing the shrinkage difference comprise: the uneven wall thickness of each part in the PE pipe causes the shrinkage difference of products, the position and size of a sprue, the cooling of a mold and the temperature of the mold,
formula of shrinkage rate of PE pipe fitting:
Figure GDA0002858203880000022
wherein S is the shrinkage factor, DMIs the size of the die for PE pipe fittings, DpIs the PE tubing size.
Optionally, the parameters related to step 2 include calculating the product weight of the PE pipe, the projected area of the product, the injection molding amount of the injection molding machine, and the mold plate and mold clamping force of the injection molding machine.
Optionally, in the step 3, the physical property table of the PE material of the original manufacturer is obtained according to the different physical property tables of the PE materials of different manufacturers, or the closest physical property table of the PE material is found in the Moldflow software;
the physical property table of the PE material comprises linear shrinkage, viscosity and specific temperature, pressure and volume relation change of the material.
Optionally, the modeling of the PE pipe in step 4 is modeling in the Moldflow software, or modeling in another software to introduce a model for the mold flow analysis.
Optionally, the mesh modeled by the PE pipe in step 5 includes process optimization of mesh division, mesh inspection, and mesh repair.
Optionally, in step 6, the preselected factor affecting ovality is: and (3) performing simulation analysis on a complete injection molding process by using each condition factor.
Optionally, in the step 7, comparing the deformation of the PE pipe as a whole and the deformation analysis and the allowable value of the PE pipe in the X, Y, Z three-dimensional directions, and analyzing an ovality value of the functional use section of the PE pipe, that is, analyzing the ovality of each section in the PE pipe.
Optionally, in step 8, the mandrel and the cavity of the PE pipe mold are subjected to pre-variable ellipse correction according to the analyzed ovality of each segment in the PE pipe, so as to provide the pre-deformation amount of the functional use section circle segment of the PE pipe.
According to the method for correcting the ovality of the PE pipe fitting in the sectional mode, the process of injection molding of the PE pipe fitting is simulated by using mold flow software. By analyzing various factor factors influencing the ovality, the ovality factor factors influencing the PE pipe fitting are subjected to identification analysis, trend change and optimal selection. And (3) analyzing the ovality factor by adopting numerical condition simulation, and performing predeformation design quantity on a core shaft and a cavity of the PE pipe fitting mold in a sectional manner. The ovality is corrected by adopting sectional type compensation of the PE pipe fitting, so that the core and cavity repairing processing of the PE pipe fitting mold and the production input time of the PE pipe fitting mold are greatly shortened, and the key size of the ovality of the PE pipe fitting is greatly improved. The ovality of the PE pipe fitting is effectively controlled, qualified PE pipe fitting products can be produced at one time, and meanwhile the quality, the production efficiency and the installation efficiency of the PE pipe fitting are improved. Compared with the prior art, the method for correcting the ovality of the produced PE pipe fitting is carried out. The method for producing the PE pipe fitting is stable in product quality, simple in process and capable of saving a large amount of manpower and material resources. In addition, use this application, reducible mould examination mould time, and then shorten the development time of PE pipe fitting product.
The above and other objects, advantages and features of the present application will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the present application will be described in detail hereinafter by way of illustration and not limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a graph of the material properties of an HE3490LS in a PE material according to one embodiment of the present application;
FIG. 2 is a product mesh quality of a 315-45 degree elbow model according to one embodiment of the present application;
FIG. 3 is a diagram of a 315-45 degree elbow cooling model simulation according to one embodiment of the present application;
FIG. 4 is a graph of the gate position and the large and small dwell pressure switch position for a 315-45 degree bend according to one embodiment of the present application;
FIG. 5 is a graph of the 315-45 degree elbow volumetric contraction according to one embodiment of the present application;
FIG. 6 is an overall deformation diagram of a 315-45 degree elbow according to one embodiment of the present application;
FIG. 7 is a graph of a deformation analysis in the X direction for a 315-45 degree bend according to one embodiment of the present application;
FIG. 8 is a graph of deformation analysis in the Y direction for a 315-45 degree bend according to one embodiment of the present application;
FIG. 9 is a graph of a Z-direction deformation analysis of a 315-45 degree bend according to one embodiment of the present application;
FIG. 10 is a schematic view of a segmented modified PE tube ovality according to one embodiment of the present application.
Detailed Description
The industry currently recognizes that: in order to realize smooth demolding in injection molding production, mandrels of production molds of PE pipe fittings are straight mandrels or conical mandrels. The inventor creatively provides 'sectional pre-deformation design quantity for a core shaft and a cavity of a PE pipe fitting die', and the technical bias is overcome.
The inventor finds out according to production experience for many years that:
characteristics of the PE pipe fitting product: the wall thickness of the PE pipe fitting product is greatly different from that of other common products, and the PE pipe fitting product is characterized in that the wall thickness is small and large, the thickness is different from 5mm to-70 mm, and the diameter is different from 20mm to 1200 mm. Therefore, it is necessary and meaningful to study the ovality of the caliber.
Manufacturing raw materials of PE pipe fittings: the PE material has a large shrinkage range.
The ovality of the PE pipe fitting produced by injection molding is influenced by the specification and structure, equipment, molding conditions, molds, materials and the like of the pipe fitting.
Based on this, the inventor creatively provides a method for correcting the ovality of the PE pipe in a sectional manner due to the large wall thickness of the PE pipe and the large elastic deformation of the PE material.
Fig. 1 is a graph of the material properties of one HE3490LS in PE material according to one embodiment of the present application. FIG. 2 is a product mesh quality of a 315-45 degree elbow model according to one embodiment of the present application. FIG. 3 is a diagram of a 315-45 degree elbow cooling model simulation according to one embodiment of the present application. Figure 4 is a graph of the gate position and the large and small dwell pressure switch position for a 315-45 degree elbow according to one embodiment of the present application. Figure 5 is a graph of the 315-45 degree elbow volumetric contraction according to one embodiment of the present application. Figure 6 is an overall deformation diagram of a 315-45 degree elbow according to one embodiment of the present application. FIG. 7 is a graph of a deformation analysis in the X direction for a 315-45 degree bend according to one embodiment of the present application. FIG. 8 is a graph of deformation analysis in the Y direction for a 315-45 degree bend according to one embodiment of the present application. FIG. 9 is a graph illustrating Z-direction deformation analysis of a 315-45 degree bend according to one embodiment of the present application. FIG. 10 is a schematic view of a segmented modified PE tube ovality according to one embodiment of the present application.
Referring to fig. 1-10, the present application provides a method for correcting ovality of PE pipe in a segmented manner, comprising the following steps:
step 1, obtaining the maximum ovality value allowed by the PE pipe fitting, and identifying factor factors influencing the ovality.
Specifically, in the step 1, the first step,
the ovality formula of the PE pipe fitting is as follows:
Figure GDA0002858203880000041
wherein e is ovality, dMaxIs the maximum diameter of the cross-section circle of the PE pipe fitting, dMinThe minimum diameter of the cross-sectional circle of the PE pipe and dn the nominal diameter of the pipe.
The PE socket pipe fitting has a corresponding specified numerical range in national standards, and the maximum out-of-roundness of the PE socket pipe fitting does not exceed the requirement of 0.015 dn.
The shrinkage unevenness of the PE pipe is a main cause of ovality of the PE pipe, and the shrinkage of the PE pipe includes directional shrinkage, linear size shrinkage of PE molecules of the PE pipe, and post-shrinkage of the PE pipe. Where directional shrinkage is a direct cause of product ovality. When the PE pipe fitting is subjected to injection molding, the PE pipe fitting is anisotropic due to the orientation effect of polyethylene molecules, the shrinkage is large along the material flowing direction, and the shrinkage is small in the direction perpendicular to the material flowing direction. Due to the shrinkage directionality, the PE pipe product warps and ovality is generated corresponding to the caliber of the PE pipe.
Formula of shrinkage rate of PE pipe fitting:
Figure GDA0002858203880000051
wherein S is the shrinkage factor, DMIs the size of the die for PE pipe fittings, DpIs the PE tubing size.
The main factors affecting the contraction difference include: the shrinkage difference of the product is caused by uneven wall thickness of each part in the PE pipe fitting; the position and size of the gate; mold cooling and mold temperature.
The geometric characteristics of the PE pipe fittings are different, the sleeve structure, the elbow structure, the tee joint structure and the like, and products with different sizes and specifications have different diameters and different wall thicknesses.
The example takes 315-45 degree elbow as an example for analysis, and the formula of the ovality of the PE pipe fitting is adopted
Figure GDA0002858203880000052
D is calculated to obtain the diameter of 315MaxMaximum value and dMinThe difference between the minimum values 4.725, the maximum allowable ovality value for this product, is 4.725.
And 2, selecting proper equipment and parameters matched with the equipment according to the number and the weight of the PE pipe fitting model cavity. Wherein, the proper equipment can be selected according to the existing equipment of the current company.
Specifically, the parameters related to the step 2 include calculating the product weight of the PE pipe, the projection area of the product, the injection molding amount of the injection molding machine, and the size of the mold plate and the mold clamping force of the injection molding machine.
In this example, a company matching equipment is a 2600T stretch injection molding machine, which can inject 45Kg of plastic, and the weight of the 315-45 degree elbow pipe product is 15 Kg.
And 3, determining a physical property table (UDB file) of the raw material for producing the PE pipe fitting.
Specifically, in step 3, the physical property table of the PE material of the original manufacturer is obtained according to the physical property table of the PE material of different manufacturers, or the closest physical property table of the PE material is found in the Moldflow software. The physical property table of the PE material comprises linear shrinkage, viscosity and specific temperature, pressure and volume relation change of the material.
In this example, the PE material from which the tubing is made is, for example, model number HE3490LS from northern european chemicals. As shown in fig. 1, according to HE3490LS material property diagram provided by nordic chemical industry.
And 4, modeling a PE pipe fitting model with compatible mold flow.
Specifically, the modeling of the PE pipe in step 4 is modeling in the Moldflow software, or modeling in another software to introduce a model for the mold flow analysis. Wherein the created model is typically a CAD model of the PE pipe.
In this example, the 315-45 degree elbow model Creo models the CAD format.
And 5, setting the division type and the loading of the model mesh.
Specifically, the mesh modeled by the PE pipe in step 5 includes process optimization of mesh division, mesh inspection, and mesh repair.
The grid division method combining manual and automatic can be adopted, and the adjustment can be carried out according to the self-computing machine and the efficiency requirement.
In this example, the 315-45 degree elbow meshing is shown in FIG. 2.
And 6, performing simulation analysis according to preselected factor factors influencing ellipticity.
Specifically, in step 6, the preselected factor affecting ovality is: PE material, PE pipe fitting wall thickness, gate size and position, and mold temperature and cooling, wherein each condition factor is used for simulation analysis of a complete injection molding process.
In this example, as shown in FIG. 3, a cooling model map is analyzed. As shown in fig. 4, the 315-45 degree elbow gate location and size analysis. As shown in fig. 5, the 315-45 degree elbow volumetric shrinkage analysis. As shown in fig. 6, the overall deformation analysis was performed for the 315-45 degree elbow.
And 7, solving the change trend of the ovality of the PE pipe fitting and the change value of each curved surface circle.
Specifically, in step 7, the overall deformation of the PE pipe and the deformation analysis in the X, Y, Z three-dimensional directions are compared with the allowable values, and an ovality value of the functional use segment of the PE pipe is analyzed, that is, the ovality of each segment in the PE pipe is analyzed.
In this example, as shown in fig. 7, 8 and 9, the maximum relative deformation of the 315-45 degree elbow reaches 7.8 and the relative deformation of the mouth is large by performing X \ Y \ Z three-direction deformation analysis. The maximum relative deformation in the X direction was 2.54, the maximum relative deformation in the Y direction was 5.0, and the maximum relative deformation in the Z direction was 5.7.
And 8, carrying out reverse compensation design on a core shaft and a cavity insert of the mold according to the analyzed ovality of each section in the PE pipe fitting, namely according to the change value of each curved surface circle, and carrying out pre-changed ovality correction to obtain the pre-deformation amount of the functional use section circle section of the PE pipe fitting. Namely, the pre-deformation correction is carried out by a segment type method.
As shown in fig. 1, the segment type is to divide the PE pipe into several different lengths in the functional area cross-section circle. And carrying out sectional correction on the product according to specific analysis data, and giving out the pre-deformation amount of each section. For example, in this example, the transformation is divided into L1, L2, and L.
By the method, the uneven mandrel is corrected, so that the ovality problem of the PE pipe fitting is solved. The actual production verifies that the effect is good.
According to the method for correcting the ovality of the PE pipe fitting in the sectional mode, the process of injection molding of the PE pipe fitting is simulated by using mold flow software. By analyzing various factor factors influencing the ovality, the ovality factor factors influencing the PE pipe fitting are subjected to identification analysis, trend change and optimal selection. And (3) analyzing the ovality factor by adopting numerical condition simulation, and performing predeformation design quantity on a core shaft and a cavity of the PE pipe fitting mold in a sectional manner. The ovality is corrected by adopting sectional type compensation of the PE pipe fitting, so that the core and cavity repairing processing of the PE pipe fitting mold and the production input time of the PE pipe fitting mold are greatly shortened, and the key size of the ovality of the PE pipe fitting is greatly improved. The ovality of the PE pipe fitting is effectively controlled, qualified PE pipe fitting products can be produced at one time, and meanwhile the quality, the production efficiency and the installation efficiency of the PE pipe fitting are improved. Compared with the prior art, the method for correcting the ovality of the produced PE pipe fitting is carried out. The method for producing the PE pipe fitting is stable in product quality, simple in process and capable of saving a large amount of manpower and material resources. In addition, use this application, reducible mould examination mould time, and then shorten the development time of PE pipe fitting product.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which this application belongs.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, "a plurality" means two or more unless specifically defined otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (7)

1. A method for correcting ovality of a PE pipe in a segmented mode is characterized by comprising the following steps:
step 1, obtaining the maximum ovality value allowed by a PE pipe fitting, and identifying factor factors influencing the ovality;
step 2, selecting proper equipment and parameters matched with the equipment according to the number and the weight of the PE pipe fitting model cavities;
step 3, determining a physical property table of a raw material for producing the PE pipe fitting;
step 4, modeling a PE pipe fitting model with compatible mold flow;
step 5, setting the division type and loading of the model mesh;
step 6, carrying out simulation analysis according to preselected factor factors influencing ellipticity;
step 7, solving the change trend of the ellipticity of the PE pipe fitting and the change value of each curved surface circle, wherein in the step 7, the integral deformation of the PE pipe fitting and the deformation analysis and the allowable value of X, Y, Z three-dimensional directions of the PE pipe fitting are compared, and the ellipticity value of the functional use section of the PE pipe fitting is analyzed, namely the ellipticity of each section in the PE pipe fitting is analyzed;
and 8, performing reverse compensation design on the mandrel and the cavity insert of the die according to the change value of each curved surface circle to solve the correction ovality, and performing pre-deformation correction by using a sectional method, wherein the sectional method is to divide the PE pipe into a plurality of different length sections in the functional area cross section circle, and in the step 8, performing pre-deformation ovality correction on the mandrel and the cavity of the PE pipe die according to the analyzed ovality of each section in the PE pipe to obtain the pre-deformation amount of the functional use cross section circle section of the PE pipe.
2. The method according to claim 1, wherein, in the step 1,
the ovality formula of the PE pipe fitting is as follows:
Figure FDA0002976820900000011
wherein e is ovality, dMaxIs the maximum diameter of the cross-section circle of the PE pipe fitting, dMinThe minimum diameter of the cross section circle of the PE pipe fitting, and dn is the nominal diameter of the pipe fitting;
the shrinkage unevenness of the PE pipe is the main reason for the ovality of the PE pipe, and the main factor factors influencing the shrinkage difference comprise: the uneven wall thickness of each part in the PE pipe causes the shrinkage difference of products, the position and size of a sprue, the cooling of a mold and the temperature of the mold,
formula of shrinkage rate of PE pipe fitting:
Figure FDA0002976820900000012
wherein S is the shrinkage factor, DMIs the size of the die for PE pipe fittings, DpIs the PE tubing size.
3. The method of claim 1, wherein the parameters associated with step 2 include calculating the product weight of the PE pipe, the projected area of the product, the injection molding amount of the injection molding machine, and the mold plate and mold clamping force of the injection molding machine.
4. The method as claimed in claim 1, wherein the step 3 is to obtain the physical property table of the PE material of the original manufacturer according to the physical property table of the PE material of different manufacturers, or to find the closest physical property table of the PE material in the Moldflow software;
the physical property table of the PE material comprises linear shrinkage, viscosity and specific temperature, pressure and volume relation change of the material.
5. The method of claim 1, wherein the step 4 of modeling the PE pipe is modeling in Moldflow software, or modeling by introducing modeling flow analysis into another software modeling.
6. The method of claim 1, wherein the step 5 of gridding the PE pipe modeling comprises process optimization of gridding, gridding inspection and gridding repair.
7. The method according to any one of claims 1-6, wherein in step 6, the preselected factor affecting ovality comprises: and (3) performing simulation analysis on a complete injection molding process by using each condition factor.
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