CN110315741A - The method of sectional type amendment PE pipe fitting ovality - Google Patents
The method of sectional type amendment PE pipe fitting ovality Download PDFInfo
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- CN110315741A CN110315741A CN201910570023.9A CN201910570023A CN110315741A CN 110315741 A CN110315741 A CN 110315741A CN 201910570023 A CN201910570023 A CN 201910570023A CN 110315741 A CN110315741 A CN 110315741A
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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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- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
This application discloses a kind of methods of sectional type amendment PE pipe fitting ovality, are related to the production of PE pipe fitting.The method of the sectional type amendment PE pipe fitting ovality of the application, pass through the various factors factor of analyzing influence ovality, using value conditions simulation analysis ovality factor, predeformation design is carried out with mandrel and type chamber of the sectional type to PE pipe fitting mold, correct ovality, then the method for carrying out injection molding, the effective ovality for controlling PE pipe fitting, qualified PE tubing products can be disposably produced, while improving the quality and production and installation effectiveness of PE pipe fitting.The method orthopedic to progress ovality after the PE pipe fitting produced compared with prior art.PE pipe fitting is produced using the present processes, not only stable product quality, and process is simple, can save a large amount of man power and material.In addition, the mold die trial time can be reduced using the application, and then shorten the development time of PE tubing products.
Description
Technical field
This application involves the productions of PE pipe fitting, more particularly to a kind of method of sectional type amendment PE pipe fitting ovality.
Background technique
PE pipeline is extensive in fields such as buried combustion gas, water supply, pressure drainage, underground Environment Protection and Drainage of Pulled Water, chemical industry fluid, mines
Using.PE pipeline includes PE pipe fitting and PE tubing.PE pipe fitting be by PE plastic pellet by injection molding machine be plasticized after in a mold
PE tubing products are molded by certain condition.PE pipe fitting ovality has a great impact to the installation of pipe fitting and connection effect.
The assembly and welding of the influence pipe fitting in each section of the tubular portion or insertion depth part of PE pipe fitting.Therefore, ovality
It is a main parameter of PE pipe fitting quality control.And in order to improve PE pipe fitting production efficiency, combination die using more and more,
The coherence request of the ovality of the product of different cavity in combination die.
The quality of existing market PE pipe fitting is irregular, when ovality excessively its dominance factor of E pipe fitting is exactly to construct
Dress unmatches in the process, and operator needs then to assemble its fair in place using corresponding tooling and fixture, so to construction
Cause difficulty.Its Recessive elementS ovality is overproof to will cause the failure of welding result.
It is orthopedic to PE pipe fitting ovality at present, be while hot, using the flexible feature of PE, to the PE pipe fitting just produced
Fixture is taken to press or support PE pipe fitting.Such mode process trouble, effect are limited.
Summary of the invention
Aiming to overcome that the above problem or at least being partially solved or extenuate for the application solves the above problems.
This application provides a kind of methods of sectional type amendment PE pipe fitting ovality, operate as steps described below:
Step 1, the oval angle value of maximum that PE pipe fitting allows is obtained, identification influences the Factors of ovality；
Step 2, suitable equipment and matching parameter are chosen according to PE pipe fitting model cavity number and weight；
Step 3, the physical property table of production PE pipe fitting raw material is determined；
Step 4, the compatible PE pipe fitting model of modeling mould stream；
Step 5, the classified types of setting model grid and load；
Step 6, sunykatuib analysis is carried out according to the Factors of the influence ovality of pre-selection；
Step 7, the changing value of PE pipe fitting ovality variation tendency and each curved surface circle is found out；
Step 8, Contrary compensation design solution is carried out according to mandrel and type chamber mold insert of the changing value of each curved surface circle to mold
Ovality is certainly corrected, carries out predeformation amendment in sectional type method, wherein sectional type is to PE pipe fitting in functional area section circle
It is divided into different several length sections.
Optionally, in the step 1,
PE pipe fitting ovality formula:
Wherein, e is ovality, dMaxFor the maximum gauge of PE pipe fitting section circle, dMinMinimum for PE pipe fitting section circle is straight
Diameter, dn are the nominal diameter of pipe fitting；
The contraction unevenness of PE pipe fitting is to influence the principal element of difference in shrinkage the main reason for causing PE pipe fitting ovality
The factor include: in PE pipe fitting each section wall unevenness cause product difference in shrinkage, gate location and size, mold is cooling and mold
Temperature,
PE tubing contracts rate formula:
Wherein, S is shrinking percentage, DMFor the die size of PE pipe fitting, Dp is PE plumbing dimensions.
Optionally, step 2 relevant parameter includes the product weight for calculating PE pipe fitting, the projected area of product, injection molding
The shot of machine and the mould of injection molding machine and clamp force size.
Optionally, the step 3 is different according to the physical property table of the PE material of different manufacturers, obtains former material manufacturer
The physical property table of PE material, or find in Moldflow software the physical property table of immediate PE material；
The physical property table of PE material includes linear contraction, viscous vertical property and the variation of specific temperature pressure-volume relation of material.
Optionally, in the step 4 PE pipe fitting modeling, be the established model in Moldflow software, or in other software
The model of established model importing mold flow analysis.
Optionally, the grid that PE pipe fitting models in the step 5 includes the mistake of grid dividing, grid inspection and mesh amending
Cheng Youhua.
Optionally, in the step 6, the Factors of the influence ovality of pre-selection: PE material, PE tube wall thickness, cast gate
The temperature and cooling of size and position and mold, wherein each condition element factor pair one complete injection molding process mould
Quasi- analysis.
Optionally, in the step 7, to tri- dimension Direction distortions of X, Y, Z point of PE pipe fitting overall deformation and PE pipe fitting
Analysis is compared with permissible value, is analyzed the ovalizing deflection value that PE pipe fitting function uses section, that is, is analyzed each segment in PE pipe fitting
Ovality.
Optionally, in the step 8, according to each segment ovality of PE pipe fitting kind analyzed to the mandrel of PE pipe fitting mold
The oval amendment become in advance with type chamber provides PE pipe fitting function and uses the predeformation amount of section circle section.
The method of the sectional type amendment PE pipe fitting ovality of the application, using the simulation PE pipe fitting injection molding of mould stream software
Process.By the various factors factor of analyzing influence ovality, identification point is carried out to the ovality Factors for influencing PE pipe fitting
Analysis, Long-term change trend, optimal selection.Using value conditions simulation analysis ovality factor, with sectional type to the core of PE pipe fitting mold
Axis and type chamber carry out predeformation design flow.Using PE pipe fitting sectional type compensating approach ovality, so that the type core of PE pipe fitting mold
The production investment time for repairing processing and PE pipe fitting mold with type chamber greatly shortens, and substantially improves PE pipe fitting ovality
Critical size.The ovality of effective control PE pipe fitting, can disposably produce qualified PE tubing products, improve simultaneously
The quality and production and installation effectiveness of PE pipe fitting.The side orthopedic to progress ovality after the PE pipe fitting produced compared with prior art
Method.PE pipe fitting is produced using the present processes, not only stable product quality, and process is simple, can save a large amount of manpower
And material resources.In addition, the mold die trial time can be reduced using the application, and then shorten the development time of PE tubing products.
According to the accompanying drawings to the detailed description of the specific embodiment of the application, those skilled in the art will be more
Above-mentioned and other purposes, the advantages and features of the application are illustrated.
Detailed description of the invention
Some specific embodiments of the application are described in detail by way of example and not limitation with reference to the accompanying drawings hereinafter.
Identical appended drawing reference denotes same or similar part or part in attached drawing.It should be appreciated by those skilled in the art that these
What attached drawing was not necessarily drawn to scale.In attached drawing:
Fig. 1 is according to one of PE material of the application one embodiment HE3490LS material properties figure；
Fig. 2 is the product mesh quality according to the 315-45 degree elbow model of the application one embodiment；
Fig. 3 is the 315-45 degree elbow cooling jig simulation drawing according to the application one embodiment；
Fig. 4 is 315-45 degree elbow gate location and size pressure maintaining switching position according to the application one embodiment
Figure；
Fig. 5 is the 315-45 degree elbow volume contractible graph according to the application one embodiment；
Fig. 6 is the 315-45 degree elbow overall deformation figure according to the application one embodiment；
Fig. 7 is the deformation analysis figure according to the 315-45 degree elbow X-direction of the application one embodiment；
Fig. 8 is the deformation analysis figure according to the 315-45 degree elbow Y-direction of the application one embodiment；
Fig. 9 is the deformation analysis figure according to the 315-45 degree elbow Z-direction of the application one embodiment；
Figure 10 is the schematic diagram that PE pipe fitting ovality is corrected according to the sectional type of the application one embodiment.
Specific embodiment
Industry is generally acknowledged at present: can smoothly be demoulded to be molded production, the mandrel of the production mould of PE pipe fitting is straight core
Axis or taper mandrel.And " sectional type becomes the mandrel and type chamber of PE pipe fitting mold to creative the proposing of inventor in advance
Shape design flow " overcomes above-mentioned technology prejudice.
Inventor has found according to the knowhow of many years:
The characteristics of PE tubing products: the wall thickness of PE tubing products and common other products difference are big, it is characterized in that wall
Thickness have it is small have big, differed from 5mm thickness to -70mm thickness, diameter is differed from 20mm to 1200mm.Therefore, it is ellipse to study its bore
Circularity is it is necessary to and meaning.
Manufacture PE pipe fitting raw material: the contraction range of PE material is big.
PE pipe fitting injection molding is manufactured, and ovality is by pipe fitting specification framework, equipment, condition of molding, mold, material
Etc. factors influence.
Based on this, since the wall thickness of PE pipe fitting is big, the elastic deformation of PE material is big in addition, and inventor's creativeness proposes section
The method of segmentation amendment PE pipe fitting ovality.
Fig. 1 is according to one of PE material of the application one embodiment HE3490LS material properties figure.Fig. 2 is basis
The product mesh quality of the 315-45 degree elbow model of the application one embodiment.Fig. 3 is according to the application one embodiment
315-45 degree elbow cooling jig simulation drawing.Fig. 4 is according to the 315-45 degree elbow of the application one embodiment gate location
With size pressure maintaining switching position figure.Fig. 5 is the 315-45 degree elbow volume contractible graph according to the application one embodiment.Fig. 6 is
According to the 315-45 degree elbow overall deformation figure of the application one embodiment.Fig. 7 is the 315- according to the application one embodiment
The deformation analysis figure of one eighth bend X-direction.Fig. 8 is the deformation according to the 315-45 degree elbow Y-direction of the application one embodiment
Analysis chart.Fig. 9 is the deformation analysis figure according to the 315-45 degree elbow Z-direction of the application one embodiment.Figure 10 is according to this
Apply for the schematic diagram of the sectional type amendment PE pipe fitting ovality of one embodiment.
Referring to Fig. 1-10, this application provides a kind of methods of sectional type amendment PE pipe fitting ovality, as steps described below
Operation:
Step 1, the oval angle value of maximum that PE pipe fitting allows is obtained, identification influences the Factors of ovality.
Specifically, in the step 1,
PE pipe fitting ovality formula:
Wherein, e is ovality, dMaxFor the maximum gauge of PE pipe fitting section circle, dMinMinimum for PE pipe fitting section circle is straight
Diameter, dn are the nominal diameter of pipe fitting.
Wherein give the numberical range of respective specified in its national standard of PE socket pipe fitting, PE bellmouth pipe fitting most very much not
Circularity should be no more than the requirement of 0.015dn.
The contraction unevenness of PE pipe fitting is the contraction of PE pipe fitting the main reason for causing PE pipe fitting ovality, including PE pipe fitting
PE molecule directionality shrink, linear dimension shrink and PE pipe fitting after-contraction.Wherein directionality contraction is that product is elliptical straight
Connect reason.PE pipe fitting is in injection molding, the orientation effect of polyethylene molecule, makes PE pipe fitting in anisotropy, moves along stream
It is small that big, normal thereto direction contraction is shunk in direction.The directionality of contraction, PE tubing products occur warpage and correspond to PE pipe diameter
Produce ovality.
PE tubing contracts rate formula:
Wherein, S is shrinking percentage, DMFor the die size of PE pipe fitting, Dp is PE plumbing dimensions.
Its influence difference in shrinkage principal element factor include: in PE pipe fitting each section wall unevenness cause product shrink it is poor
It is different；Gate location and size；Mold cooling and mold temperature.
The geometrical characteristic difference of PE pipe fitting, tube-in-tube structure, elbow structure, three-port structure etc., the product of different dimensions
Its diameter different wall thickness is also different.
This example is analyzed by taking 315-45 degree elbow as an example, by PE pipe fitting ovality formulaIt calculates
It arrives, the d of 315 boresMaxMaximum value and dMinThe oval angle value of the maximum that difference 4.725. between the minimum value i.e. product allows is
4.725。
Step 2, suitable equipment and matching parameter are chosen according to PE pipe fitting model cavity number and weight.Wherein, may be used
Suitable equipment is chosen according to current company's existing equipment.
Specifically, step 2 relevant parameter includes the product weight for calculating PE pipe fitting, the projected area of product, injection molding
The shot of machine and the mould of injection molding machine and clamp force size.
In this example, such as the matched equipment of certain company is that 2600T shakes male injection molding machine, and shot can achieve
45Kg, 315-45 degree bend pipe tools product weight are 15Kg.
Step 3, the physical property table (UDB file) of production PE pipe fitting raw material is determined.
Specifically, the step 3 is different according to the physical property table of the PE material of different manufacturers, obtains former material manufacturer
The physical property table of PE material, or find in Moldflow software the physical property table of immediate PE material.The physical property table packet of PE material
Include linear contraction, viscous vertical property and the variation of specific temperature pressure-volume relation of material.
In this example, for example, manufacturing the HE3490LS of the model Borealis of the PE material of the pipe fitting.Such as Fig. 1
HE3490LS material properties figure that is shown, being provided according to Borealis.
Step 4, the compatible PE pipe fitting model of modeling mould stream.
Specifically, in the step 4 PE pipe fitting modeling, be the established model in Moldflow software, or in other software
The model of established model importing mold flow analysis.Wherein, model built is generally the CAD model of PE pipe fitting.
In this example, 315-45 degree elbow model Creo models CAD format.
Step 5, the classified types of setting model grid and load.
Specifically, the grid that PE pipe fitting models in the step 5 includes the mistake of grid dividing, grid inspection and mesh amending
Cheng Youhua.
Wherein, the Meshing Method manually and automatically combined can be used, according to own computer device and efficiency requirements tune
Section.
In this example, 315-45 degree elbow grid dividing is as shown in Figure 2.
Step 6, sunykatuib analysis is carried out according to the Factors of the influence ovality of pre-selection.
Specifically, in the step 6, the Factors of the influence ovality of pre-selection: PE material, PE tube wall thickness, cast gate
The temperature and cooling of size and position, mold, wherein each condition element factor pair one complete injection molding process simulation
Analysis.
In this example, as shown in figure 3, cooling jig map analysis.As shown in figure 4,315-45 degree elbow gate location and big
Small analysis.As shown in figure 5,315-45 degree elbow volume Analysis of shrinkage.As shown in fig. 6, to 315-45 degree elbow overall deformation point
Analysis.
Step 7, the changing value of PE pipe fitting ovality variation tendency and each curved surface circle is found out.
Specifically, in the step 7, to the tri- dimension Direction distortion analyses of PE pipe fitting overall deformation and X, Y, Z and allow
Value is compared, and is analyzed the ovalizing deflection value that PE pipe fitting function uses section, that is, is analyzed the ovality of each segment in PE pipe fitting.
In this example, as shown in Fig. 7, Fig. 8, Fig. 9, to 315-45 degree elbow carry out X Y the analysis of tri- Direction distortions of Z just
Its maximum relative deformation of the result of analysis reaches 7.8, and oral area relative deformation is big.X-direction maximum relative deformation 2.54,
Y-direction maximum relative deformation 5.0, Z-direction maximum relative deformation 5.7.
Step 8, according to each segment ovality of PE pipe fitting kind analyzed, i.e., according to the changing value of each curved surface circle to mold
Mandrel and type chamber mold insert carry out Contrary compensation design, become in advance ovality amendment, provide PE pipe fitting function use section
The predeformation amount of circle section.Predeformation amendment is carried out in sectional type method.
As shown in Figure 1, sectional type is to be divided into different several length sections in functional area section circle to PE pipe fitting.According to tool
Body analyzes data and carries out sectional type amendment to product, provides every section of predeformation amount.For example, in this example, be divided into L1, L2,
L.......Ln sections, a predeformation amount is provided for each section, to carry out ovality amendment.
By herein described method, a rough mandrel is corrected out, so that the ovality for solving PE pipe fitting is asked
Topic.It verifies, works well through actual production.
The method of the sectional type amendment PE pipe fitting ovality of the application, using the simulation PE pipe fitting injection molding of mould stream software
Process.By the various factors factor of analyzing influence ovality, identification point is carried out to the ovality Factors for influencing PE pipe fitting
Analysis, Long-term change trend, optimal selection.Using value conditions simulation analysis ovality factor, with sectional type to the core of PE pipe fitting mold
Axis and type chamber carry out predeformation design flow.Using PE pipe fitting sectional type compensating approach ovality, so that the type core of PE pipe fitting mold
The production investment time for repairing processing and PE pipe fitting mold with type chamber greatly shortens, and substantially improves PE pipe fitting ovality
Critical size.The ovality of effective control PE pipe fitting, can disposably produce qualified PE tubing products, improve simultaneously
The quality and production and installation effectiveness of PE pipe fitting.The side orthopedic to progress ovality after the PE pipe fitting produced compared with prior art
Method.PE pipe fitting is produced using the present processes, not only stable product quality, and process is simple, can save a large amount of manpower
And material resources.In addition, the mold die trial time can be reduced using the application, and then shorten the development time of PE tubing products.
It should be noted that unless otherwise indicated, technical term or scientific term used in this application should be this Shen
It please the ordinary meaning that is understood of one of ordinary skill in the art.
In the description of the present application, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description the application and simplifies description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore should not be understood as the limitation to the application.
In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply relatively important
Property or implicitly indicate the quantity of indicated technical characteristic.In the description of the present application, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In this application unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in this application.
In this application unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
The preferable specific embodiment of the above, only the application, but the protection scope of the application is not limited thereto,
Within the technical scope of the present application, any changes or substitutions that can be easily thought of by anyone skilled in the art,
Should all it cover within the scope of protection of this application.Therefore, the protection scope of the application should be with scope of protection of the claims
Subject to.
Claims (9)
1. a kind of method of sectional type amendment PE pipe fitting ovality, which is characterized in that operate as steps described below:
Step 1, the oval angle value of maximum that PE pipe fitting allows is obtained, identification influences the Factors of ovality；
Step 2, suitable equipment and matching parameter are chosen according to PE pipe fitting model cavity number and weight；
Step 3, the physical property table of production PE pipe fitting raw material is determined；
Step 4, the compatible PE pipe fitting model of modeling mould stream；
Step 5, the classified types of setting model grid and load；
Step 6, sunykatuib analysis is carried out according to the Factors of the influence ovality of pre-selection；
Step 7, the changing value of PE pipe fitting ovality variation tendency and each curved surface circle is found out；
Step 8, Contrary compensation design is carried out according to mandrel and type chamber mold insert of the changing value of each curved surface circle to mold to solve to repair
Positive ovality carries out predeformation amendment in sectional type method, wherein sectional type is to be divided into PE pipe fitting in functional area section circle
Different several length sections.
2. the method according to claim 1, wherein in the step 1,
PE pipe fitting ovality formula:
Wherein, e is ovality, dMaxFor the maximum gauge of PE pipe fitting section circle, dMinFor the minimum diameter of PE pipe fitting section circle, dn
For the nominal diameter of pipe fitting；
The contraction unevenness of PE pipe fitting is to influence the principal element factor of difference in shrinkage the main reason for causing PE pipe fitting ovality
Include: in PE pipe fitting each section wall unevenness cause product difference in shrinkage, gate location and size, mold is cooling with mold temperature
Degree,
PE tubing contracts rate formula:
Wherein, S is shrinking percentage, DMFor the die size of PE pipe fitting, DpFor PE plumbing dimensions.
3. the method according to claim 1, wherein step 2 relevant parameter includes the production for calculating PE pipe fitting
Product weight, the projected area of product, the shot of injection molding machine and injection molding machine mould and clamp force size.
4. the method according to claim 1, wherein the step 3 is the PE material according to different manufacturers
Physical property table it is different, obtain the physical property table of the PE material of former material manufacturer, or immediate PE material is found in Moldflow software
The physical property table of material；
The physical property table of PE material includes linear contraction, viscous vertical property and the variation of specific temperature pressure-volume relation of material.
5. the method according to claim 1, wherein in the step 4 PE pipe fitting modeling, be in Moldflow
Established model in software, or the model of mold flow analysis is imported in other software modeling type.
6. the method according to claim 1, wherein the grid that PE pipe fitting models in the step 5 includes grid
The process optimization of division, grid inspection and mesh amending.
7. the method according to claim 1, wherein in the step 6, the influence ovality of pre-selection because of procatarxis
Son includes: the temperature and cooling of PE material, PE tube wall thickness, cast gate size and position and mold, wherein each condition element because
Son is to a complete injection molding process sunykatuib analysis.
8. the method according to claim 1, wherein in the step 7, to PE pipe fitting overall deformation and PE pipe fitting
X, Y, Z tri- dimension Direction distortions analysis be compared with permissible value, analyze the ovalizing deflection that PE pipe fitting function uses section
Value, that is, analyze the ovality of each segment in PE pipe fitting.
9. according to the method described in claim 8, it is characterized in that, respectively being saved in the step 8 according to the PE pipe fitting kind analyzed
The oval amendment that section ovality becomes the mandrel and type chamber of PE pipe fitting mold in advance provides PE pipe fitting function and uses section circle section
Predeformation amount.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910570023.9A CN110315741B (en) | 2019-06-27 | 2019-06-27 | Method for correcting ellipticity of PE pipe fitting in sectional manner |
| CN202110420315.1A CN113147008A (en) | 2019-06-27 | 2019-06-27 | Method for correcting ovality of PE pipe fitting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910570023.9A CN110315741B (en) | 2019-06-27 | 2019-06-27 | Method for correcting ellipticity of PE pipe fitting in sectional manner |
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| CN202110420315.1A Division CN113147008A (en) | 2019-06-27 | 2019-06-27 | Method for correcting ovality of PE pipe fitting |
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| CN201910570023.9A Active CN110315741B (en) | 2019-06-27 | 2019-06-27 | Method for correcting ellipticity of PE pipe fitting in sectional manner |
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| Publication number | Publication date |
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| CN110315741B (en) | 2021-05-28 |
| CN113147008A (en) | 2021-07-23 |
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