CN110901105A - RTM (resin transfer molding) mold structure capable of being heated or cooled rapidly and using method thereof - Google Patents
RTM (resin transfer molding) mold structure capable of being heated or cooled rapidly and using method thereof Download PDFInfo
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- CN110901105A CN110901105A CN201911161856.6A CN201911161856A CN110901105A CN 110901105 A CN110901105 A CN 110901105A CN 201911161856 A CN201911161856 A CN 201911161856A CN 110901105 A CN110901105 A CN 110901105A
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- heating
- cooling
- cooling module
- rtm
- structure capable
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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
- B29C70/48—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 and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
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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
- B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
- B29C33/04—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using liquids, gas or steam
Abstract
The invention discloses an RTM (resin transfer molding) mold structure capable of being heated or cooled rapidly and a using method thereof, wherein the RTM mold comprises a mold body and a heating/cooling module; the upper heating/cooling module and the lower heating/cooling module are respectively provided with an S-shaped groove, and the pipeline is arranged in the grooves; the filler is arranged in the groove, and the module body and the filler are in close contact with the surface of the die body. According to the invention, the oil heating mould is designed into the mould body and the heating/cooling module, and the filler is made of a material with high heat conductivity coefficient, such as aluminum-magnesium alloy, so that the heat transfer efficiency of the mould is ensured. The invention reduces the design cost and the manufacturing cost on the premise of realizing the rapid heating/cooling of the die, and realizes the low-cost replacement after the die heating module is damaged.
Description
Technical Field
The invention relates to the field of RTM (resin transfer molding) in the liquid forming composite material manufacturing technology, in particular to an RTM mold capable of being heated/cooled rapidly and a using method thereof.
Background
With the more and more obvious effect of the composite material in the fields of aerospace and civil use, the high manufacturing cost of the composite material is still the problem which needs to be solved urgently by the composite material manufacturing technology, and the liquid molding technology has gained more and more attention as one of the main development directions of the low-cost composite material manufacturing technology. The conventional prepreg-autoclave process requires low-temperature storage and transportation of prepreg at (-18 ℃) and the size of the product is limited by the size of the autoclave, and the manufacturing cost and the operation cost of autoclave equipment are extremely high, so that the further development of the composite material manufacturing technology is severely limited by the manufacturing cost.
RTM (resin transfer molding) is gaining increasing use in the military, civil aircraft and automotive fields as the most promising technology for liquid molding. The design of the rapid heating/cooling structure of the mold is taken as the key in the RTM technology, and the design idea directly influences the final quality, the qualification rate, the cost and the service life of the mold. The RTM technology is that under a certain temperature, low-viscosity resin subjected to vacuum defoaming is injected into a closed mold which is pre-paved with a fiber reinforced preform by means of pressure under the condition that the mold is vacuumized, so that the fiber reinforced preform is fully soaked by the resin, and the temperature is raised and cured to obtain the composite material. The method is different from an injection molding process, the reinforced fibers are paved in advance in the mold, the inside and the outside of the mold are completely vacuum during glue injection, and the mold needs to bear certain pressure and curing pressure after glue injection. The RTM mold is mainly heated by an oven, but the heating/cooling rate of the oven is slow, and the mold is heated and cooled by heat conduction, so that the heating efficiency is low, the temperature uniformity of the mold is poor, and the problems of mold deformation and product quality are easily caused. The rapid heating and cooling system for the mold gradually replaces the oven heating, and consists of a rapid heating/cooling system and the mold, wherein the heating/cooling oil is used as a medium to heat and cool the mold through heat conduction, so that the designability of the mold is realized.
When the mold is designed, criss-cross long holes are drilled in the mold, and the long holes are plugged according to heat distribution to form a heating/cooling oil flowing loop so as to ensure the heat transfer efficiency of the heating oil, but for an RTM mold with a complex structure and a large size (greater than 500mm ＊ 500mm), the length of the holes is larger, the pipeline structure is also more complex, and the mold processing cost is higher.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a design, manufacture and use method of an RTM (resin transfer molding) low-cost mold with a rapid heating/cooling oil way structure.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a can rapid heating/refrigerated RTM mould structure, this structure includes heating/cooling module, mould body and lower heating/cooling module, and it has S type recess to open respectively on the upper and lower heating/cooling module, and the mould body includes mould, pellet and lower mould, and heating/cooling pipeline installs in the recess of upper and lower heating/cooling module, and the mould body is placed between upper and lower heating/cooling module to with mould body fixed connection. The pipeline may be one or more sections of pipeline. The bending form and the trend of each section of the multi-section pipeline can be different. The length of the pipeline extending out of the two ends of the mould is 5 mm-200 mm, and each section of pipeline is provided with an injection port and at least one oil outlet. The pipeline is a copper pipe.
The bending shape, depth and width of the S-shaped grooves on the upper heating/cooling module and the lower heating/cooling module can be consistent or inconsistent, and the diameters of pipelines placed in the S-shaped grooves of the upper heating/cooling module and the lower heating/cooling module can be consistent or inconsistent. And a filler is arranged between the pipeline and the groove wall of the S-shaped groove, and the pipeline is tightly contacted with the mold by the filler. The filler may be a low melting point metallic material, such as aluminum magnesium alloy. The upper heating/cooling module and the lower heating/cooling module are connected with the die body through threads.
The use method of the mold structure comprises the following steps:
the method comprises the following steps: fastening the upper and lower heating/cooling modules with the die body;
step two: when heating, hot oil is injected into the pipeline, and heat is quickly transferred to the die body through the pipeline and the filler, so that the die body is heated;
step three: during the cooling, with in the cooling oil injection pipeline, the heat of mould body passes through filler and pipeline transmission and gives the cooling oil, and the cooling oil takes the heat out of the oil-out, realizes the quick cooling of mould body.
The invention has the beneficial effects that: by designing the conventional oil heating mould into the mould body and the heating/cooling module, the design and manufacturing cost of the mould can be effectively reduced, and the rapid heating and cooling of the RTM mould are realized; the heating/cooling module is provided with the S-shaped groove, the S-shaped groove can be designed according to heat distribution, a copper pipe structure is arranged in the groove, and the copper pipe and the heating/cooling module are filled with high heat conduction materials, so that the processing and plugging of long-size and high-precision holes are avoided on the premise of ensuring the heat transfer efficiency of the die, and the manufacturing cost of the die is reduced; and after the heating module of the mould is damaged, realize the low-cost change.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a heating/cooling module;
FIG. 3 is a schematic structural diagram of a module body;
FIG. 4 is a schematic view of a localized heating/cooling module;
FIG. 5 is a schematic view of a copper tube mounting structure;
in the figure, 1-upper heating/cooling module, 2-copper tube, 3-die body, 4-lower heating/cooling module, 5-filler, 6-groove.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
As shown in fig. 1 to 5, the RTM mold includes a mold body 3 and a heating/cooling module; a groove 6 is arranged on the heating/cooling module, and a pipeline is arranged in the groove 6;
a filler 5 is arranged between the pipeline and the groove wall of the groove loop 6, the heating/cooling module and the filler 5 are in close contact with the surface of the die body 3, and the upper and lower heating/cooling modules 1 and 4 are respectively fastened on the die body 3 by screws;
the length of the pipeline extending out of the heating/cooling module is 5 mm-200 mm, and the heating/cooling module is provided with at least one injection port and at least one oil outlet. Preferably, the injection port and the oil outlet are arranged on different sides of the RTM mold. The end of the tube (injection port) is connected to a rapid heating/cooling device. The heating and cooling module bears the pressure of heating/cooling oil and meets the sealing requirement, so that the oil is prevented from leaking and the die cavity is not polluted.
In this embodiment, the pipeline is copper pipe 2 pipeline, adopts copper material, and the heat conduction is effectual.
As shown in fig. 2-4, the basic unit of the groove 6 is an L-shaped branch, and the grooves 6 formed by connecting the L-shaped branches end to end are distributed on the module body. The branch forms a loop, and the whole groove 6 is S-shaped and reasonably distributed on the die body 3, so that heat conduction is facilitated. Preferably, the groove density and the axis arrangement are designed according to the requirement of heat efficiency in the die, and an opening processing mode is adopted, so that the processing difficulty and the processing cost are reduced.
In this embodiment, as shown in fig. 5, the filler 5 is an aluminum magnesium alloy, which has a good heat conduction effect and is easy to ensure the filling quality.
The heating/cooling oil path structure in this example includes an upper heating/cooling module 1 and a lower heating/cooling module 4; the upper heating/cooling module 1 is disposed on the mold body 3, and the lower heating/cooling module 4 is disposed under the mold body 3. The conventional RTM mold includes an upper mold, a lower mold, and a core mold, and the number of the core molds and the size of the mold are different depending on the structure of a product. The upper die and the lower die are respectively conducted with heat through the two heating/cooling modules, the heating or cooling effect is better, and the heat conduction efficiency is higher.
The heating/cooling module is connected with the die body 3 through screws, the heating/cooling module is required to be in close contact with the die body 3 after connection, and gaps are filled with aluminum magnesium alloy, so that a cavity is avoided, and heat conduction efficiency is guaranteed.
Heating/cooling module and mould body 3 are the cuboid structure, and heating/cooling module and mould body 3's length and width are unanimous, and whole equipment or device wholeness are stronger, and it is effectual to counterpoint, the operation of being convenient for.
Defining four corners of the heating/cooling module as a first corner, a second corner, a third corner and a fourth corner, respectively; wherein the first corner and the third corner are opposite corners, and the second corner and the fourth corner are opposite corners;
the injection port is arranged at the first corner, and the oil outlet is arranged at the third corner; or the injection port is arranged at the second corner, and the oil outlet is arranged at the fourth corner.
Four corners of the upper heating/cooling module 1 and the lower heating/cooling module 4 correspond to each other (the first corner of the upper heating/cooling module 1 corresponds to the first corner of the lower heating/cooling module 4, the second corner of the upper heating/cooling module 1 corresponds to the second corner of the lower heating/cooling module 4, the third corner of the upper heating/cooling module 1 corresponds to the third corner of the lower heating/cooling module 4, and the fourth corner of the upper heating/cooling module 1 corresponds to the fourth corner of the lower heating/cooling module 4), wherein an inlet of the upper heating/cooling module 1 is arranged at the first corner of the upper heating/cooling module 1, and an outlet of the upper heating/cooling module 1 is arranged at the third corner of the upper heating/cooling module 1; or the injection port of the upper heating/cooling module 1 is arranged at the second corner of the upper heating/cooling module 1, and the oil outlet of the upper heating/cooling module 1 is arranged at the fourth corner of the upper heating/cooling module 1. An injection port of the lower heating/cooling module 4 is arranged at a first corner of the lower heating/cooling module 4, and an oil outlet of the lower heating/cooling module 4 is arranged at a third corner of the lower heating/cooling module 4; or the injection port of the lower heating/cooling module 4 is arranged at the second corner of the lower heating/cooling module 4, and the oil outlet of the lower heating/cooling module 4 is arranged at the fourth corner of the lower heating/cooling module 4.
The filler 5 fills the grooves 6 of the heating/cooling module and ensures that the filler 5 and the heating/cooling module face where the grooves 6 are located form a plane.
The RTM mold using method comprises the following steps:
the method comprises the following steps: fastening the heating/cooling module to the mold body 3;
step two: when heating, hot oil is injected into the pipeline, and heat is quickly transferred to the die body 3 through the pipeline and the filler 5, so that the die body 3 is heated;
step three: during the cooling, with in the cooling oil injection pipeline, the heat of mould body 3 transmits for the cooling oil through filler 5 and pipeline, and the cooling oil takes the heat out of the oil-out, realizes the quick cooling of mould body 3. The various parts are further described below:
1) part of the mould body 3
The mould body 3 is used for realizing various functions in the RTM forming process, is related to a product structure, is generally realized by adopting methods such as partitioning, combining, pin positioning, inclined plane positioning and the like, is provided with a glue injection port and a glue outlet, adopts a sealing strip to seal the mould and the like, and comprises an upper mould, a lower mould, a core block and the like.
2) Heating/cooling module
A groove 6 is designed on the heating/cooling module, a copper pipe 2 is arranged in the groove 6, metal with good heat conductivity and low melting point is filled between the copper pipe 2 and the groove, such as aluminum magnesium alloy and the like, so as to ensure the heat conduction efficiency, and after the filling, the groove surface of the heating/cooling module is a plane.
3) The heating/cooling module is connected with the die body 3
A group of heating/cooling modules are distributed on the upper portion and the lower portion of the die body 3 respectively, the heating/cooling modules are connected with the die body 3 through screws, and the connecting surface can be filled with aluminum-magnesium alloy and other metals with good heat conductivity, low hardness and low melting point in a compensation mode, so that heating/cooling efficiency is guaranteed.
4) The using method comprises the following steps:
when the mold is heated, the rapid heating/cooling system starts a heating function, heating oil is injected into the copper pipe 2 by means of power (a motor), heat is transferred to the filler (aluminum-magnesium alloy) through the copper pipe 2, and the aluminum-magnesium alloy transfers the heat to the mold, so that the rapid heating of the mold is realized; during cooling, the quick heating/cooling system starts the cooling function, and with the help of in power injection copper pipe 2 with the coolant oil, the heat transmits for copper pipe 2 through filler (almag), and copper pipe 2 transmits the heat for heating coolant oil, realizes the quick cooling of mould.
On the premise of solving the problem of low heating and cooling efficiency of the RTM mold, the invention simplifies the design structure of the mold, reduces the manufacturing difficulty of the mold and reduces the manufacturing cost of the mold.
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, it should be noted that any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a can rapid heating or refrigerated RTM mould structure, its characterized in that includes heating/cooling module, mould body and lower heating/cooling module, and it has S type recess to open respectively on the upper and lower heating/cooling module, and the mould body includes mould, pellet and lower mould, and heating/cooling pipeline installs in the recess of upper and lower heating/cooling module, and the mould body is placed between upper and lower heating/cooling module to with mould body fixed connection.
2. A RTM mold structure capable of rapid heating/cooling according to claim 1, wherein said tube is one or more segments, and each of the segments may have a different curved shape and different direction.
3. A RTM mold structure capable of rapid heating/cooling according to claim 2, wherein said pipe extends from both ends of the mold by a length of 5mm to 200mm, and each pipe has an inlet and at least one outlet.
4. A RTM mold structure capable of rapid heating/cooling according to claim 2, wherein said pipe is a copper pipe.
5. A RTM mold structure capable of rapid heating/cooling according to claim 1, wherein said upper and lower heating/cooling modules have S-shaped grooves with a curved shape and a uniform depth and width, and said heating/cooling modules have S-shaped grooves with a uniform diameter.
6. A RTM mold structure capable of rapid heating/cooling according to claim 1, wherein said upper and lower heating/cooling modules have different S-shaped groove curved shapes and different depths and widths, and said upper and lower heating/cooling modules have different diameters of pipes placed in said S-shaped grooves.
7. A RTM mold structure capable of rapid heating/cooling according to claim 1, wherein a filler is provided between the tube and the groove wall of the S-shaped groove, the filler making the tube and the mold closely contact.
8. A RTM mold structure capable of rapid heating/cooling according to claim 7, wherein said filler is a low melting point metallic material.
9. A RTM mold structure capable of rapid heating/cooling according to claim 8, wherein said low melting point metallic material is al-mg alloy.
10. A method for using an RTM mold structure capable of rapid heating/cooling, comprising the steps of:
the method comprises the following steps: fastening the upper and lower heating/cooling modules with the die body;
step two: when heating, the heating/cooling system injects hot oil into the pipeline under the power of electrically heating the oil, and the heat is quickly transferred to the die body through the pipeline and the filler, so that the die body is heated;
step three: during cooling, after the heating/cooling system cools the oil through water, the oil cooling oil is injected into the pipeline under power, heat of the die body is transmitted to the cooling oil through the filler and the pipeline, and the cooling oil brings the heat out of the oil outlet, so that the rapid cooling of the die body is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911161856.6A CN110901105A (en) | 2019-11-22 | 2019-11-22 | RTM (resin transfer molding) mold structure capable of being heated or cooled rapidly and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911161856.6A CN110901105A (en) | 2019-11-22 | 2019-11-22 | RTM (resin transfer molding) mold structure capable of being heated or cooled rapidly and using method thereof |
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| CN110901105A true CN110901105A (en) | 2020-03-24 |
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| CN201911161856.6A Pending CN110901105A (en) | 2019-11-22 | 2019-11-22 | RTM (resin transfer molding) mold structure capable of being heated or cooled rapidly and using method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112325486A (en) * | 2020-11-25 | 2021-02-05 | 珠海格力电器股份有限公司 | Water heater and determination method and anti-freezing control method of anti-freezing heating element thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105773951A (en) * | 2014-12-22 | 2016-07-20 | 廖晧杰 | Die temperature control element and hot pressing system |
| CN206471326U (en) * | 2017-01-23 | 2017-09-05 | 四川英杰电气股份有限公司 | A kind of liquid-cooling heat radiator |
-
2019
- 2019-11-22 CN CN201911161856.6A patent/CN110901105A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105773951A (en) * | 2014-12-22 | 2016-07-20 | 廖晧杰 | Die temperature control element and hot pressing system |
| CN206471326U (en) * | 2017-01-23 | 2017-09-05 | 四川英杰电气股份有限公司 | A kind of liquid-cooling heat radiator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112325486A (en) * | 2020-11-25 | 2021-02-05 | 珠海格力电器股份有限公司 | Water heater and determination method and anti-freezing control method of anti-freezing heating element thereof |
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