CN114834069A - Flexible positioning-based preparation method of arc-shaped hollow rubber section - Google Patents
Flexible positioning-based preparation method of arc-shaped hollow rubber section Download PDFInfo
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- CN114834069A CN114834069A CN202210377543.XA CN202210377543A CN114834069A CN 114834069 A CN114834069 A CN 114834069A CN 202210377543 A CN202210377543 A CN 202210377543A CN 114834069 A CN114834069 A CN 114834069A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000011265 semifinished product Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000000047 product Substances 0.000 claims abstract description 15
- 239000004744 fabric Substances 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000011248 coating agent Substances 0.000 claims abstract description 6
- 238000000576 coating method Methods 0.000 claims abstract description 6
- 238000005520 cutting process Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 239000002344 surface layer Substances 0.000 claims abstract description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 238000004073 vulcanization Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 235000006040 Prunus persica var persica Nutrition 0.000 description 1
- 240000006413 Prunus persica var. persica Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007723 die pressing method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010057 rubber processing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
-
- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
-
- 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
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3076—Aircrafts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a flexible positioning-based preparation method of an arc-shaped hollow rubber section, which comprises the following steps: selecting the same kind of arc hollow rubber section, cutting off the end part of the same kind of arc hollow rubber section, and forming a flexible positioning short section by the cut-off part; dividing geometric regions of the rubber sectional material according to the sectional shape characteristics of the arc-shaped hollow rubber sectional material to be prepared; determining the sizes of the filling rubber semi-finished products corresponding to the geometric regions according to an area equality method; manufacturing each filled rubber semi-finished product; filling the semi-finished products of the filled rubber into the cavity of the mold and the positions corresponding to the mold core in sequence; coating the surface layer of each semi-finished product filled with rubber with a fabric; the semi-finished product of the filled rubber and the mold core at one end of the cavity are fixed and limited, and the semi-finished product of the filled rubber and the mold core at the other end of the cavity are flexibly positioned through a positioning short section; closing the die, pressurizing, heating and vulcanizing; demoulding to obtain a qualified product. The method can effectively solve the problem of eccentricity in section bar preparation caused by rigid connection of the metal mold core and the mold body in the traditional preparation method.
Description
Technical Field
The invention belongs to the technical field of rubber processing, and particularly relates to a preparation method of an arc-shaped hollow rubber section based on flexible positioning.
Background
The rubber section bar with a hollow structure has a P-shaped, an omega-shaped, a peach heart-shaped and the like cross section, is a large class of products for sealing an airplane structure, is mainly used for airplane body structures such as airplane flaps, front edges, rear edges and the like, plays pneumatic roles of sealing, shaping and the like, has a large number of products and different shapes, and often needs rubber and fabric to be compounded to increase the strength of the products so as to adapt to a severe air environment.
Taking a rubber section with a P-type hollow structure as an example, the rubber section is a large-size hollow structure rubber section which is compounded by rubber and fabric and has a certain radian in the shape, and is generally manufactured by a die pressing process by using a specific die, and the structure of a typical product is shown in fig. 1-3. In order to realize the compounding of rubber and fabric and the appearance with a certain radian, a production process of mould pressing is needed; in order to achieve its hollow configuration, a mold core with a certain curvature is required to shape its configuration. In combination with the above requirements, there are currently existing metal molds for producing such products, and a typical mold structure is shown in fig. 4.
When the die is used, the positioning of the die core is realized by rigidly connecting and positioning the die core and the die body at two ends of the die core, and the conditions of uneven wall thickness and overlarge deviation, namely the eccentric condition, easily occur at the part of a product with a radian appearance.
Disclosure of Invention
The invention provides a preparation method of an arc-shaped hollow rubber section based on flexible positioning, which solves the problem of product eccentricity caused by rigid positioning of a mold core in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the preparation method of the arc-shaped hollow rubber section based on flexible positioning comprises the following steps:
selecting manufactured similar arc-shaped hollow rubber sectional materials, cutting off the end parts of the similar arc-shaped hollow rubber sectional materials, wherein the cut-off parts form flexible positioning short sections;
dividing the geometric area of the rubber section according to the sectional shape characteristics of the arc-shaped hollow rubber section to be prepared;
determining the sizes of the filling rubber semi-finished products corresponding to the geometric regions according to an area equality method;
manufacturing each filled rubber semi-finished product;
filling the semi-finished products of the filled rubber into the cavity of the mold and the positions corresponding to the mold core in sequence;
coating the surface layer of each semi-finished product filled with rubber with a fabric;
the semi-finished product of the filled rubber and the mold core at one end of the cavity are fixed and limited, and the semi-finished product of the filled rubber and the mold core at the other end of the cavity are flexibly positioned through the positioning short section; closing the die, pressurizing, heating and vulcanizing;
demoulding to obtain a qualified product.
Further, the die comprises an upper die, a lower die, a middle die and a die core, wherein a cavity is formed between the upper die, the lower die and the middle die; the plug mounting groove has been all seted up at both ends about last, lower mould, sets up the plug in the plug mounting groove, but the both ends of plug shutoff die cavity, and the plug and the mold core in one side correspond the position and set up the pinhole, and the mold core passes through the fixed setting on the plug of locating pin.
Furthermore, the end part of the cavity on the other side is provided with the flexible positioning short section, the flexible positioning short section is arranged on the mold core in a penetrating way, one end of the flexible positioning short section is connected with the plug, and the other end of the flexible positioning short section is connected with the semi-finished product filled with rubber.
Furthermore, at the arc position of the mold core in the cavity, the filled rubber semi-finished product and the coated fabric are coated from the inner arc side to the outer arc side.
Furthermore, the flexible positioning short section is 20-30 mm long.
Further, the section of the arc-shaped hollow rubber section is of a P-shaped structure.
Further, geometric area division is carried out on the rubber section, and the method specifically comprises the following steps: a circular ring geometry region, a corner geometry region, and a shank geometry region.
Further, the section of the arc-shaped hollow rubber section is of an omega-like structure.
Further, geometric area division is carried out on the rubber section, and the method specifically comprises the following steps: t-shaped geometric area, horizontal geometric area, vertical geometric area, and semi-circular geometric area.
Compared with the prior art, the invention has the following beneficial effects:
1. one embodiment of the method of the invention provides a flexible positioning-based arc-shaped hollow rubber profile preparation method, which takes the rubber profile with an elastic function as a flexible positioning short section, can effectively solve the problem of profile preparation eccentricity caused by rigid connection between a metal mold core and a mold body in the traditional preparation method, and improves the product production yield from 30% to more than 60%.
2. In the embodiment of the invention, the rubber section is divided into geometric areas according to the structures of different products, so that the glue filling amount of different areas in the cavity can be calculated quantitatively, the production can be guided conveniently according to the basis on the basis of a logic algorithm, the mold and the mold core are protected, and the impact damage of excessive expansion force generated by excessive glue amount in the vulcanization process on the mold parting surface and the mold core over the years is avoided.
3. In the embodiment of the invention, the usage amount and the coating mode of the rubber material at the whole die and the arc corner are reasonably controlled, so that the condition that the die core is deflected due to uneven stress in the vulcanization process caused by uneven and excessive rubber material on a single fulcrum beam structure is effectively relieved.
Of course, it is not necessary for all of the above-described advantages to be achieved in order for the invention to be practiced in all of the various ways.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that drawings of other embodiments can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a typical structure of a rubber type with a P-type hollow structure;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 4 is a schematic diagram of a typical mold structure for producing a rubber type P-shaped hollow structure;
FIG. 5 is a schematic structural diagram of a flexible positioning sub in embodiment 1;
FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5;
FIG. 7 is a schematic view of geometric region division in example 1;
FIG. 8 is a schematic view showing a positioning manner of a mold core in embodiment 1;
FIG. 9 is a schematic view of geometric region division in example 2;
in the figure, 1-upper die, 2-lower die, 3-middle die, 4-die core, 5-circular ring geometric area, 6-corner geometric area, 7-handle geometric area, 8-T-shaped geometric area, 9-horizontal geometric area, 10-two sections of vertical geometric area, 11-semicircular geometric area, 12-plug, 13-positioning pin and 14-flexible positioning short joint.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of 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 not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by one of ordinary skill in the art as appropriate. The present invention will be described in detail below with reference to the drawings and examples.
The rubber section with a hollow structure causes eccentricity in the manufacturing process and mainly comprises the following two main reasons:
Firstly, the two ends of the mold core are rigidly connected with the mold body by positioning pins, and the mold is eccentric.
Because the wrapping mold core, the upper mold and the lower mold are paved with glue and wrapped with cloth, the temperature of the mold is lower than the vulcanizing temperature, so that the mold enters a machine table, and the temperature rise process of the mold can occur after the mold closing and pressurization. In the process of rising temperature, the condition of expend with heat and contract with cold can appear in the mould, and because rising temperature is a process action, the condition of relative lag can appear for the mould body in the intensification of mold core, the thermal expansion action of mould body and mold core promptly, especially in length direction thermal expansion action asynchronous. The positioning pin and the die core are in clearance fit, a clearance of 0.035mm exists in the diameter direction, and the linear thermal expansion of a general 1m long die heated to the vulcanization temperature of 160 ℃ is 1.6mm, which is far larger than the fit clearance. Because the thermal expansion of the mold core and the upper and lower molds is asynchronous, bending moment is generated at the arc position, so that the mold core deviates from the original position, and eccentricity is caused.
And secondly, the large-size mold core is in relation with the single fulcrum beam of the positioning pin, and the molding is eccentric.
The dimension of the shape of the mold core of a typical product is 900mm multiplied by 250mm, the end caps at two ends support the mold core, and the positioning pins are used as fulcrum beams and form a single fulcrum beam relationship with the mold core with a radian, which means that in the vulcanization process, when the mold core with the radian is subjected to a small external force, the mold core can deviate from the original position to cause eccentricity.
Example 1:
in this embodiment, a rubber section with a P-type hollow structure is taken as an example, and a preparation process based on flexible positioning is described in detail, which specifically includes the following steps:
s1, selecting the manufactured similar arc hollow rubber section, cutting off the end part of the section, and forming a flexible positioning short section by the cut-off part; in the embodiment, the flexible positioning short section is 20-30 mm long, and the structure is shown in fig. 5 and 6.
S2, dividing the geometric area of the rubber section with the P-type hollow structure according to the cross-sectional shape characteristics of the rubber section with the P-type hollow structure; referring to fig. 7, the rubber profile of the P-type hollow structure is divided into a circular ring geometric area 5, a corner geometric area 6 and a handle geometric area 7; wherein, the circular ring geometric area 5 and the handle geometric area 7 are both regular shapes, and the corner geometric area 6 is irregular shape.
And S3, because the filled rubber semi-finished product has the same volume as the corresponding cavity and has the same area on the cross section, calculating the size of the filled rubber semi-finished product corresponding to each geometric area according to an area equality method, wherein the filled rubber semi-finished product is a straight strip-shaped rubber sheet in the embodiment.
Taking the preparation of a typical rubber section with a P-type hollow structure as an example, the external dimensions of the section are as follows: 864.7mm in length and 149.1mm in width; the sectional dimension of the profile is as follows: the inner diameter is phi 12, the wall thickness is 2mm, the arc radius at the corner is 3mm, and the width is 31 mm. The specific dimensional parameters of the geometric regions determined by the rubber profile are as follows:
The circular geometric area 5 is in a regular shape, and the film size is calculated as (thickness x width): (1.6-1.8) mmx (44-46) mm;
the geometric region 7 of the handle part is in a regular shape, and the film size is calculated as (thickness x width): (1.1-1.3) mm x (13-15), and cutting the shape according to the shape drawing of the cavity;
the corner geometry region 6 was irregular and calculated to be 16.65mm in area 2 Corresponding film dimensions are (thickness x width): (3.3-3.5) mm x (4-6) mm.
S4, manufacturing a filling rubber semi-finished product corresponding to each geometric area according to the calculated size;
s5, sequentially filling the semi-finished products of the filled rubber into the cavities of the molds and the positions corresponding to the mold cores;
s6, coating the surface layer of each semi-finished product filled with rubber with a fabric thickness of 0.2 mm;
at the arc position of the mold core in the cavity, the filled rubber semi-finished product and the coated fabric are coated from the short arc position to the long arc position, so that the usage amount of rubber at the corner of the arc can be reasonably controlled;
s7, fixing and limiting the filling rubber semi-finished product and the mold core at one end of the cavity, and flexibly positioning the filling rubber semi-finished product and the mold core at the other end of the cavity through the positioning short section, wherein the positioning short section comprises the following specific steps:
referring to fig. 8, the mold comprises an upper mold 1, a lower mold 2, a middle mold 3 and a mold core 4, and a cavity 15 is formed between the upper mold and the middle mold; plug mounting grooves are formed in the left end and the right end of the upper die and the lower die, plugs 12 are arranged in the plug mounting grooves, and the plugs 12 can plug the two ends of the cavity;
The pin holes are formed in the positions, corresponding to the left plug 12 and the left mold core 4, of the mold core 4, the mold core 4 is fixedly arranged on the plug 12 through the positioning pins 13, and therefore the semi-finished product filled with rubber at one end of the cavity and the mold core 4 are fixed and limited. The end part of the right side cavity is provided with the flexible positioning short section 14, the flexible positioning short section 14 is arranged on the mold core 4 in a penetrating way, one end of the flexible positioning short section is abutted against the blocking end of the plug 12, and the other end of the flexible positioning short section is abutted against the semi-finished product of the filling rubber, so that the semi-finished product of the filling rubber at the other end of the cavity and the flexible positioning of the mold core 4 through the flexible positioning short section 14 are achieved.
Of course, in other embodiments, the left side can be flexibly positioned, and the right side can be fixed and limited; the positioning mode of one-side fixing and one-side flexibility avoids the defect that the product is eccentric due to the fact that the mold core 4 generates large stress concentration at the bending part when the mold is closed and pressurized and heated and vulcanized in the next step.
S8, closing the die, pressurizing, heating and vulcanizing;
and S9, demolding to obtain a qualified product.
Example 2:
referring to fig. 9, in this embodiment, taking an omega-shaped hollow rubber profile as an example, different from embodiment 1, geometric area division is performed on the rubber profile, and specifically includes: a T-shaped geometrical area 8, a horizontal geometrical area 9, a two-piece vertical geometrical area 10 and a semi-circular geometrical area 11.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (9)
1. The preparation method of the arc-shaped hollow rubber section based on flexible positioning is characterized by comprising the following steps:
selecting manufactured similar arc-shaped hollow rubber sectional materials, cutting off the end parts of the similar arc-shaped hollow rubber sectional materials, wherein the cut-off parts form flexible positioning short sections;
dividing the geometric area of the rubber section according to the sectional shape characteristics of the arc-shaped hollow rubber section to be prepared;
determining the sizes of the filling rubber semi-finished products corresponding to the geometric regions according to an area equality method;
manufacturing each filled rubber semi-finished product;
filling the semi-finished products of the filled rubber into the cavity of the mold and the positions corresponding to the mold core in sequence;
coating the surface layer of each semi-finished product filled with rubber with a fabric;
the semi-finished product of the filled rubber and the mold core at one end of the cavity are fixed and limited, and the semi-finished product of the filled rubber and the mold core at the other end of the cavity are flexibly positioned through the positioning short section; closing the die, pressurizing, heating and vulcanizing;
Demoulding to obtain a qualified product.
2. The method for preparing the arc-shaped hollow rubber profile based on the flexible positioning as claimed in claim 1, wherein the mold comprises an upper mold, a lower mold, a middle mold and a mold core, and a cavity is formed between the upper mold and the lower mold; the plug mounting groove has been all seted up at both ends about last, lower mould, sets up the plug in the plug mounting groove, but the both ends of plug shutoff die cavity, and the plug and the mold core in one side correspond the position and set up the pinhole, and the mold core passes through the fixed setting on the plug of locating pin.
3. The method for preparing the arc-shaped hollow rubber profile based on the flexible positioning as claimed in claim 2, wherein the flexible positioning short section is arranged at the end part of the cavity on the other side, the flexible positioning short section is arranged on the mold core in a penetrating manner, one end of the flexible positioning short section is connected with the plug, and the other end of the flexible positioning short section is connected with the semi-finished product filled with rubber.
4. The method for preparing the arc-shaped hollow rubber profile based on the flexible positioning as claimed in claim 1, wherein the filling rubber semi-finished product and the coating fabric are coated from the inner arc side to the outer arc side at the arc position of the mold core in the mold cavity.
5. The method for preparing the arc-shaped hollow rubber profile based on the flexible positioning is characterized in that the flexible positioning short section is 20-30 mm long.
6. The method for preparing the arc-shaped hollow rubber profile based on the flexible positioning as claimed in claim 1, wherein the cross section of the arc-shaped hollow rubber profile is of a P-shaped structure.
7. The method for preparing the arc-shaped hollow rubber profile based on the flexible positioning as claimed in claim 6, wherein the geometric area division of the rubber profile specifically comprises: a circular ring geometry region, a corner geometry region, and a shank geometry region.
8. The method for preparing the arc-shaped hollow rubber profile based on the flexible positioning as claimed in claim 1, wherein the cross section of the arc-shaped hollow rubber profile is in an omega-like structure.
9. The method for preparing the arc-shaped hollow rubber profile based on the flexible positioning as claimed in claim 8, wherein the geometric area division of the rubber profile specifically comprises: t-shaped geometric area, horizontal geometric area, vertical geometric area, and semi-circular geometric area.
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| 刘静，沈娟，李立伟，胡博: "特种橡胶制品" * |
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