CN109571821B - Design method of die with EPDM (ethylene-propylene-diene monomer) sponge rubber bubble tube composite sealing strip - Google Patents
Design method of die with EPDM (ethylene-propylene-diene monomer) sponge rubber bubble tube composite sealing strip Download PDFInfo
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- CN109571821B CN109571821B CN201811374892.6A CN201811374892A CN109571821B CN 109571821 B CN109571821 B CN 109571821B CN 201811374892 A CN201811374892 A CN 201811374892A CN 109571821 B CN109571821 B CN 109571821B
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- auxiliary line
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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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3835—Designing moulds, e.g. using CAD-CAM
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints
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- Manufacturing & Machinery (AREA)
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- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a die design method of a composite sealing strip with an EPDM (ethylene-propylene-diene monomer) sponge rubber bubble tube, which comprises the following steps of: constructing a three-dimensional structure data model of the sealing strip through CAE software; importing the three-dimensional structure data model of the sealing strip into Marc software; an inner auxiliary line and an outer auxiliary line are arranged in Marc software; setting a first auxiliary line segment and a second auxiliary line segment in Marc software; the top parts of two inner wall surfaces of a metal framework are set in Marc software as circle centers; carrying out deformation simulation on the sealing strip by Marc software; the obtained deformation structure of the sealing strip is the structure of the neck mold. The deformation of the joint of the sponge rubber and the compact rubber can be well determined, the shape of the neck ring mold of the composite sealing strip is well matched, and the debugging cost and time of the mold are greatly saved.
Description
Technical Field
The invention relates to a design method of a neck ring mold of a sealing strip, in particular to a design method of a neck ring mold with an EPDM (ethylene-propylene-diene monomer) sponge foam tube composite sealing strip.
Background
In the development process of the automobile rubber sealing strip, the design of a die is a very critical ring. In die design, the die design of a composite weatherstrip with an Ethylene Propylene Diene Monomer (EPDM) sponge foam tube is complex for the following reasons:
1. the expansion rate of the sponge rubber is different from that of the compact rubber, and the expansion rate of the sponge rubber is generally 10% -20% higher than that of the compact rubber. When the neck mold is designed, the sponge rubber and the compact rubber part need to be designed respectively, namely the sponge rubber part is reduced, and the compact rubber part is enlarged. The deformation behaviors of the two rubber materials after extrusion vulcanization are very different, and how to smoothly joint the two rubber materials becomes a difficulty in designing the products.
2. The sponge rubber has 2 processes of vulcanization and foaming after being extruded, the shape change is obvious, and the control on the shape of the sponge rubber foam tube is difficult.
For the reasons, a set of qualified neck mold with the EPDM sponge rubber foam tube composite sealing strip is designed. In the past, a mouth mold engineer designs the shape of a mouth mold according to experience by using CAD software, the deformation of a joint part of sponge rubber and compact rubber cannot be determined, and trial production and modification are required for many times, so that the debugging time in the early development stage is long, the cost is high, and great waste of manpower and material resources is brought.
Disclosure of Invention
The invention aims to solve the technical problem of providing a die design method for a composite sealing strip with an EPDM (ethylene-propylene-diene monomer) sponge rubber bubble tube, which can well determine the deformation of a joint part of sponge rubber and dense rubber, well match the die shape of the composite sealing strip and greatly save the debugging cost and time of a die.
The technical scheme adopted by the invention for solving the technical problems is as follows: a die design method for a composite sealing strip with an EPDM (ethylene-propylene-diene monomer) sponge foam tube comprises the following steps:
1) constructing a three-dimensional structure data model of a sealing strip through CAE software, wherein the sealing strip comprises a bubble tube and a clamping part which is positioned below the bubble tube and is of an inverted U-shaped structure, and a metal framework of the inverted U-shaped structure is arranged in the clamping part;
2) importing the three-dimensional structure data model of the sealing strip into Marc software;
3) an inner auxiliary line and an outer auxiliary line are arranged in Marc software, the outer auxiliary line is arranged along the outer side curve of the bubble tube, and the inner side curve of the bubble tube is zoomed by 80% -90% to form the inner auxiliary line;
4) a first auxiliary line segment and a second auxiliary line segment are arranged in Marc software, and the first auxiliary line segment and the second auxiliary line segment are respectively positioned at the bottoms of two inner wall surfaces of a metal framework;
5) the top parts of two inner wall surfaces of a metal framework are set in Marc software as circle centers;
6) carrying out deformation simulation on the sealing strip by Marc software, taking the centroid of an auxiliary line outside the bubble tube as a zooming center, and zooming the bubble tube by 80-90% of the zooming center, so that the inner side curve of the bubble tube is superposed with the inner auxiliary line;
7) the clamping part rotates 10 degrees towards two sides by taking the circle center set in the step 5) as a rotation center and the first auxiliary line segment and the second auxiliary line segment set in the step 4) as rigid bodies;
8) the obtained deformation structure of the sealing strip is the structure of the neck mold.
Further preferred embodiments of the present invention: in step 3), the inner curve of the bubble tube is scaled by 85% to form the inner auxiliary line, and in step 6), the bubble tube is scaled by 85% so that the inner curve of the bubble tube is overlapped with the inner auxiliary line;
further preferred embodiments of the present invention: and 5) setting one end of the metal framework bending section close to the inner wall surface as a circle center.
Compared with the prior art, the invention has the advantage that a finished product mold does not need to be produced and processed. And a required sealing strip three-dimensional structure data model is established through CAE software. And (4) carrying out deformation characteristic analysis on the sealing strip through Marc software to obtain the design shape of the sealing strip neck mold. The virtual realization of the design of the compound sealing strip die greatly saves the debugging cost and time of the die and avoids the waste of unnecessary manpower and material resources. In the specific design, the foam tube is made of sponge rubber, and the foam tube can meet the design requirement after being extruded and vulcanized and foamed. Therefore, the shape of the die of the sponge rubber bubble tube needs to be reduced according to a certain proportion. According to the expansion rate of the sponge rubber, the shrinkage proportion of the sponge rubber bubble tube is 80-90%. The clamping part is made of dense glue, wherein the shortest distance between the small blades is 1.0 mm, the thin-wall metal strength of the mouth mold cannot meet the requirement, and meanwhile, reasonable flow channels are difficult to arrange, so that the clamping part is unfolded by 20 degrees. And according to the actual situation, a rigid body and a circle center are designed.
Drawings
FIG. 1 is a schematic view of an original section of a sealing strip constructed by CAE software;
FIG. 2 is a schematic diagram of a sealing strip die design method in Marc software;
FIG. 3 is a model of a sealing strip section in Marc software;
FIG. 4 is a simulation result of the section of the sealing strip in Marc software;
FIG. 5 is a comparison of the profile of the sealing strip die with the original profile.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to 5: a die design method for a composite sealing strip with an EPDM (ethylene-propylene-diene monomer) sponge foam tube comprises the following steps:
1) constructing a three-dimensional structure data model of the sealing strip through CAE software, wherein the sealing strip comprises a bubble tube 1 and a clamping part 2 which is positioned below the bubble tube 1 and is of an inverted U-shaped structure, and a metal framework 3 of the inverted U-shaped structure is arranged in the clamping part 2;
2) importing the three-dimensional structure data model of the sealing strip into Marc software;
3) an inner auxiliary line 5 and an outer auxiliary line 4 are arranged in Marc software, the outer auxiliary line 4 is arranged along the outer side curve of the bubble tube 1, and the inner side curve of the bubble tube 1 is zoomed by 80% -90% to form the inner auxiliary line 5;
4) a first auxiliary line segment 9 and a second auxiliary line segment 10 are arranged in Marc software, and the first auxiliary line segment 9 and the second auxiliary line segment 10 are respectively positioned at the bottoms of two inner wall surfaces of the metal framework 3;
5) the top parts of two inner wall surfaces of a metal framework 3 are set in Marc software as circle centers 7;
6) carrying out deformation simulation on the sealing strip by Marc software, taking the centroid 6 of the outer auxiliary line 4 of the bubble tube 1 as a zooming center, and zooming the bubble tube 1 by 80-90% of the zooming center, so that the inner side curve of the bubble tube 1 is superposed with the inner auxiliary line 5;
7) the clamping part 2 rotates 10 degrees towards two sides by taking the circle center 7 arranged in the step 5) as a rotation center and the first auxiliary line segment 9 and the second auxiliary line segment 10 arranged in the step 4) as rigid bodies;
8) the obtained deformation structure of the sealing strip is the structure of the neck mold.
In step 3), scaling the inner side curve of the bubble tube 1 by 85% to form an inner auxiliary line 5, and in step 6), scaling the bubble tube 1 by 85% to make the inner side curve of the bubble tube 1 coincide with the inner auxiliary line 5;
and 5) setting one end of the bending section of the metal framework 3 close to the inner wall surface as a circle center 7.
Designing a port die of the sponge foam tube 1: an outer auxiliary line 4 and an inner auxiliary line 5 are respectively arranged on the inner side and the outer side of the bubble tube 1, the centroid 6 of the outer auxiliary line 4 is used as a zooming center, and the cross section of the bubble tube 1 is zoomed by 85% of zooming proportion, so that the inner side of the bubble tube 1 is overlapped with the inner auxiliary line 5, and the cross section defect of a sealing strip die designed by CAD software is avoided. Closely knit bush design of gluing clamping part 2: set up first supplementary line segment 9, second supplementary line segment 10 respectively in the metal framework 3 both sides of clamping part 2 and regard as the rigid body, use the top of interior wall as centre of a circle 7, with clamping part 2 rotatory 10 to both sides, avoided utilizing the sealing strip bush of CAD software design to appear the fracture defect for the distance between the little blade of clamping part 2 inside satisfies the metal strength requirement, arranges reasonable runner.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. A die design method for a composite sealing strip with an EPDM (ethylene-propylene-diene monomer) sponge foam tube is characterized by comprising the following steps:
1) constructing a three-dimensional structure data model of a sealing strip through CAE software, wherein the sealing strip comprises a bubble tube and a clamping part which is positioned below the bubble tube and is of an inverted U-shaped structure, and a metal framework of the inverted U-shaped structure is arranged in the clamping part;
2) importing the three-dimensional structure data model of the sealing strip into Marc software;
3) an inner auxiliary line and an outer auxiliary line are arranged in Marc software, the outer auxiliary line is arranged along the outer side curve of the bubble tube, and the inner side curve of the bubble tube is zoomed by 80% -90% to form the inner auxiliary line;
4) a first auxiliary line segment and a second auxiliary line segment are arranged in Marc software, and the first auxiliary line segment and the second auxiliary line segment are respectively positioned at the bottoms of two inner wall surfaces of a metal framework;
5) the top parts of two inner wall surfaces of a metal framework are set in Marc software as circle centers;
6) carrying out deformation simulation on the sealing strip by Marc software, taking the centroid of an auxiliary line outside the bubble tube as a zooming center, and zooming the bubble tube by 80-90% of the zooming center, so that the inner side curve of the bubble tube is superposed with the inner auxiliary line;
7) the clamping part rotates 10 degrees towards two sides by taking the circle center set in the step 5) as a rotation center and the first auxiliary line segment and the second auxiliary line segment set in the step 4) as rigid bodies;
8) the obtained deformation structure of the sealing strip is the structure of the neck mold.
2. The method as claimed in claim 1, wherein the inner curve of the bulb tube is scaled by 85% to form the inner auxiliary line in step 3), and the inner curve of the bulb tube is scaled by 85% to coincide with the inner auxiliary line in step 6).
3. The method for designing the die with the EPDM sponge foam tube composite sealing strip according to claim 1, wherein in the step 5), one end of the metal framework bending section close to the inner wall surface is arranged as a circle center.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811374892.6A CN109571821B (en) | 2018-11-19 | 2018-11-19 | Design method of die with EPDM (ethylene-propylene-diene monomer) sponge rubber bubble tube composite sealing strip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811374892.6A CN109571821B (en) | 2018-11-19 | 2018-11-19 | Design method of die with EPDM (ethylene-propylene-diene monomer) sponge rubber bubble tube composite sealing strip |
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| CN109571821A CN109571821A (en) | 2019-04-05 |
| CN109571821B true CN109571821B (en) | 2020-08-14 |
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| CN201811374892.6A Active CN109571821B (en) | 2018-11-19 | 2018-11-19 | Design method of die with EPDM (ethylene-propylene-diene monomer) sponge rubber bubble tube composite sealing strip |
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| CN113997875B (en) * | 2021-11-05 | 2024-05-24 | 建新赵氏科技股份有限公司 | Novel electric automobile trunk clearance sealing strip structure |
Citations (6)
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| JP2002219945A (en) * | 2000-12-13 | 2002-08-06 | Hutchinson Sa | Method for manufacturing seal strip and seal strip obtained by this method |
| WO2004082974A1 (en) * | 2003-03-18 | 2004-09-30 | Meteor Gummiwerke K.H. Bädje GmbH & Co. KG | Sealing strip for a vehicle frame structure |
| CN203832391U (en) * | 2014-04-22 | 2014-09-17 | 上海通用汽车有限公司 | Automobile trunk sealing strip |
| CN205148853U (en) * | 2015-11-28 | 2016-04-13 | 申雅密封件（淮安）有限公司 | Make up small cross section sealing strip bush of extruding by ebonite and sponge rubber |
| CN107869585A (en) * | 2017-12-14 | 2018-04-03 | 常州荣南橡胶科技有限公司 | A kind of weather strip for automobile of service life length |
| CN108247918A (en) * | 2017-12-26 | 2018-07-06 | 建新赵氏集团有限公司 | A kind of design method of weather strip for automobile section mouth mold |
-
2018
- 2018-11-19 CN CN201811374892.6A patent/CN109571821B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002219945A (en) * | 2000-12-13 | 2002-08-06 | Hutchinson Sa | Method for manufacturing seal strip and seal strip obtained by this method |
| WO2004082974A1 (en) * | 2003-03-18 | 2004-09-30 | Meteor Gummiwerke K.H. Bädje GmbH & Co. KG | Sealing strip for a vehicle frame structure |
| CN203832391U (en) * | 2014-04-22 | 2014-09-17 | 上海通用汽车有限公司 | Automobile trunk sealing strip |
| CN205148853U (en) * | 2015-11-28 | 2016-04-13 | 申雅密封件（淮安）有限公司 | Make up small cross section sealing strip bush of extruding by ebonite and sponge rubber |
| CN107869585A (en) * | 2017-12-14 | 2018-04-03 | 常州荣南橡胶科技有限公司 | A kind of weather strip for automobile of service life length |
| CN108247918A (en) * | 2017-12-26 | 2018-07-06 | 建新赵氏集团有限公司 | A kind of design method of weather strip for automobile section mouth mold |
Non-Patent Citations (2)
| Title |
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| 汽车密封条挤出成形模拟仿真与口模优化设计;吴志刚;《工程科技Ⅱ辑》;20160315(第3期);C035-300 * |
| 轿车橡胶密封条挤出口型设计;周致宏等;《橡胶工业》;20010331;第48卷(第3期);154-157 * |
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Effective date of registration: 20201215 Address after: 315600 No. 281 North Keyuan Road, Taoyuan Street, Ninghai County, Ningbo City, Zhejiang Province Patentee after: JX ZHAO'S Group Corp. Address before: 315600 No. 281 North Keyuan Road, Taoyuan Street, Ninghai County, Ningbo City, Zhejiang Province Patentee before: JIANXIN ZHAO'S Group Corp. |
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Address after: 315600 No. 2299, Xuemian North Road, Taoyuan Street, Ninghai County, Ningbo City, Zhejiang Province Patentee after: Jianxin Zhaoshi Technology Co.,Ltd. Address before: 315600 No. 281 North Keyuan Road, Taoyuan Street, Ninghai County, Ningbo City, Zhejiang Province Patentee before: JX ZHAO'S Group Corp. |