CN112454947A - Compression molding die and process for plate-shaped component - Google Patents
Compression molding die and process for plate-shaped component Download PDFInfo
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- CN112454947A CN112454947A CN202011162850.3A CN202011162850A CN112454947A CN 112454947 A CN112454947 A CN 112454947A CN 202011162850 A CN202011162850 A CN 202011162850A CN 112454947 A CN112454947 A CN 112454947A
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- plate
- die
- boss
- prepreg
- edge
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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
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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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
- B29C33/0055—Moulds or cores; Details thereof or accessories therefor with incorporated overflow cavities
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a compression molding die and a process for a plate-shaped component, wherein the die is provided with a cavity matched with the plate-shaped component, the die comprises an upper die part and a lower die part, one of the upper die part and the lower die part is provided with a circle of boss, the area formed by enclosing the boss is matched with the shape of the plate-shaped component, the outer side of the boss is also provided with a plurality of glue overflow grooves communicated with the area, the glue overflow grooves are arranged on the upper die part or the lower die part, and the glue overflow grooves extend to the edge of the corresponding die part. The die and the process can realize compression molding of the net size of the plate-shaped part, avoid the need of mechanical processing for material removal after compression molding, ensure the internal quality of the edge of a product, improve the molding efficiency of parts and reduce the cost.
Description
Technical Field
The invention relates to the technical field of compression molding processes, in particular to a compression molding die and a process for a plate-shaped component.
Background
With the development of composite material technology, relevant parts on rail vehicles such as high-speed rails and motor train units are made of composite materials, so as to meet the development requirement of light weight.
Currently, plate-shaped components on rail vehicles, such as equipment compartment end plates and the like, are generally manufactured through a prepreg compression molding process.
At present, in the compression molding process, the edge of a part has poor internal quality due to the edge benefit of curing, so that a certain edge margin (for example, about 15 mm) is usually arranged when prepreg is laid, and after the prepreg is cured and molded, redundant margin is removed through machining, so that the part manufacturing cost is high, and the molding efficiency is low.
Therefore, how to improve the compression molding process of the existing plate-shaped component to improve the molding efficiency of the component and reduce the manufacturing cost is a technical problem that needs to be solved by those skilled in the art at present.
Disclosure of Invention
The invention aims to provide a compression molding die and a process for a plate-shaped component, which can realize compression molding of net size of the plate-shaped component, avoid the need of mechanical processing and material removal after compression molding, ensure the internal quality of the edge of a product, improve the molding efficiency of parts and reduce the cost.
In order to solve the technical problem, the invention provides a compression molding mold for a plate-shaped component, which is provided with a cavity matched with the plate-shaped component, the mold comprises an upper mold part and a lower mold part, one of the upper mold part and the lower mold part is provided with a circle of boss, the area formed by enclosing the boss is matched with the shape of the plate-shaped component, the outer side of the boss is also provided with a plurality of glue overflow grooves communicated with the area, the glue overflow grooves are arranged on the upper mold part or the lower mold part, and the glue overflow grooves extend to the edge of the corresponding mold part.
In the press molding die for a plate-like member described above, the height of the boss is 95% of the thickness of the edge portion of the plate-like member.
In the above compression molding die for a plate-like member, the plurality of flash grooves are arranged at intervals along the circumference of the boss.
In the press molding die for a plate-like member, the glue overflow groove and the boss are provided in the same die portion.
The compression molding die for a plate-shaped component as described above, the plate-shaped component having at least one inner hole, the die portion provided with the boss further provided with a cylinder matching the inner hole in diameter at a position corresponding to the inner hole.
In the press molding die for a plate-like member, one of the upper die section and the lower die section is provided with a positioning pin, and the other is provided with a positioning pin hole to be fitted with the positioning pin, and the upper die section and the lower die section are relatively fixed by fitting the positioning pin and the positioning pin hole.
In the press molding die for a plate-like member, one of the upper die section and the lower die section is provided with guide posts, and the other is provided with guide holes to be fitted with the guide posts.
The present invention also provides a press molding process for a plate-like member, using the mold described in any one of the above, the press molding process comprising:
cutting the prepreg, wherein the edge of the plate-shaped component is expanded outwards by a preset size for blanking during cutting;
paving the cut prepreg in the area enclosed by the boss, and cutting and removing the part of the paved prepreg, which exceeds the inner side wall of the boss;
after paving, closing the die.
In the above-described press molding process of a plate-like member, an elastic member having a predetermined thickness is placed within a predetermined range of the edge of the surface of the laid prepreg before the mold is closed.
According to the compression molding process of the plate-shaped component, the thickness of the elastic piece is 1.5-2.5 mm, the outer edge of the elastic piece is overlapped with the outer edge of the surface of the laid prepreg, and the preset range is 4-6 mm.
In the compression molding process of the plate-shaped component, the preset size is 1.5-2.5 mm when the prepreg is cut.
In the above process for press molding a plate-like member, after the mold is closed, the mold is placed on a press machine without pressurization, and after the mold is heated to a set temperature for a first set time, the mold is pressurized to a set pressure, and at the same time, the mold is heated to a curing temperature at a set temperature rise rate, and is kept at the temperature for a second set time, and finally, the mold is depressurized and cooled.
The mould provided by the invention is characterized in that one of the upper mould part and the lower mould part is provided with a circle of boss, the area formed by enclosing the boss is matched with the shape of a plate-shaped part to be formed, and the outer side of the boss is also provided with a glue overflow groove communicated with the area enclosed by the boss; by adopting the compression molding process of the mold, when the prepreg is cut, the reserved margin can be set relatively small, the prepreg is paved and attached in the area enclosed by the boss, the edge part of the prepreg exceeding the inner wall of the boss is cut after paving, and an elastic part is placed on the surface edge of the paved prepreg after paving the prepreg; the mould sets up the boss in the position of platelike part net size to guarantee part edge size, the platelike part that utilizes this mould processing is net size, and follow-up no longer need mechanical secondary operation, wherein, the setting that overflows the gluey groove makes the pressurized in-process of solidification, and unnecessary resin can overflow from overflowing gluey groove, and the boss plays the effect of keeping off gluey, can guarantee part edge quality.
Therefore, the die and the die-pressing forming process adopting the die can realize die-pressing forming of the net size of the plate-shaped part, avoid mechanical processing after die-pressing forming, ensure the internal quality of the edge of a product, improve the forming efficiency of parts and reduce the cost.
Drawings
FIG. 1 is a schematic diagram of an upper mold portion of a mold according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a plate-like member embedded in a lower mold portion of a mold according to an embodiment of the present invention;
FIG. 3 is a partial schematic view of the lower mold portion shown in FIG. 2;
FIG. 4 is a schematic view of a portion of an edge portion of a mated and laid ply structure according to an exemplary embodiment.
Description of reference numerals:
the upper mold part 101, the positioning pin 114, the guide post 115;
the lower die part 102, a boss 121, an overflow groove 122, a column 123, a positioning pin hole 124 and a guide hole 125;
an elastic member 103, a release fabric 104;
a plate-like member 200, a lay-up structure 200'.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of an upper mold portion of a mold according to an embodiment of the present invention; FIG. 2 is a schematic structural view of a plate-like member embedded in a lower mold portion of a mold according to an embodiment of the present invention; fig. 3 is a partial schematic view of the lower mold part shown in fig. 2.
The mold provided in this embodiment is used for compression molding of plate-shaped component 200, the mold has a cavity matching plate-shaped component 200, the mold includes an upper mold part 101 and a lower mold part 102, a ring of bosses 121 is provided on lower mold part 102, the area enclosed by bosses 121 matches the outer shape of plate-shaped component 200, it can be understood that the inner peripheral wall of bosses 121 follows the outer edge of plate-shaped component 200, that is, the area enclosed by bosses 121 corresponds to the size of plate-shaped component 200.
The outer side of the boss 121 of the lower mold part 102 is further provided with a plurality of glue overflowing grooves 122 communicated with the region, and the glue overflowing grooves 122 extend to the edge of the lower mold part 102.
Here, the inner side of the boss 121 refers to a side close to the region, and correspondingly, the outer side refers to a side far from the region.
In the illustrated embodiment, the boss 121 is formed on the lower mold part 102, and the glue overflow groove 122 is also formed on the lower mold part 102, but in practice, the boss 121 may be formed on the upper mold part 101, and in contrast, the boss 121 provided on the lower mold part 102 is advantageous for laying and attaching prepreg in the compression molding process, and may be selected as needed in application. In addition, the flash groove 122 and the boss 121 may be disposed on different mold parts, that is, when the boss 121 is disposed on the lower mold part 102, the flash groove 122 may be disposed on the upper mold part 101, or the two are disposed oppositely, but the requirement for the processing accuracy of the two is high, so that in actual installation, the flash groove 122 and the boss 121 are preferably disposed on the same mold part, as shown in the illustrated embodiment, on the lower mold part 102.
The invention also provides a compression molding process of the plate-shaped component, which adopts the die and comprises the following steps:
cutting the prepreg, wherein the edge of the plate-shaped component 200 is expanded outwards by a preset size for blanking during cutting, namely, a margin of the preset size is reserved at the edge position during blanking; in practical application, the preset size can be 1.5-2.5 mm, and can be selected according to practical situations;
paving the cut prepreg in an area enclosed by the boss 121 of the lower die part 102; in a specific operation, one end of the prepreg can be laid against one inner side wall of the boss 121, so that after the prepreg is laid, a margin is left on the other side wall of the boss 121, and certainly, the prepreg does not need to be laid according to the method, as long as the prepreg is arranged in the area;
after paving, cutting off the part of the paved prepreg exceeding the inner side wall of the boss; thus, the prepreg laid in the region has a size equal to the net size of the plate-like member 200.
And then, carrying out die assembly, curing and pressurizing, and demoulding to obtain the product.
As described above, the die and the compression molding process using the die provided in this embodiment can manufacture the plate-shaped component 200 with a net size, and do not require secondary machining, the arrangement of the bosses ensures the edge size of the plate-shaped component 200, the arrangement of the glue overflow groove 122 enables excess resin to overflow from the glue overflow groove 122 during the curing and pressing process, and the bosses 121 can also play a role in blocking glue, thereby preventing excess resin from flowing away, and ensuring the molding quality of the edge portion of the plate-shaped component 200. The mold and the press molding process can improve the molding efficiency and molding quality of the plate-like member 200 while reducing the cost.
It should be noted that the figures only show an exemplary structure of the plate-like member 200 and the mold matching with the plate-like member, and it should be understood that in practical applications, the corresponding mold is correspondingly arranged according to the structure of the plate-like member 200.
In a specific scheme, the height of the boss 121 is 95% of the thickness of the edge part of the plate-shaped component 200, so that sufficient pressure can be ensured on the surface of a part during mold closing, and meanwhile, the thickness tolerance of the part can be met.
In a specific embodiment, the glue overflow grooves 122 are arranged at intervals along the circumference of the boss 121, and in practical application, the number and arrangement of the glue overflow grooves 122 are set according to the size and shape of the plate-shaped component 200 to be processed.
In a specific scheme, the upper mold part 101 is provided with a positioning pin 114, the lower mold part 102 is provided with a positioning pin hole 124 matched with the positioning pin 114, and the upper mold part 101 and the lower mold part 102 can be fixed to each other through the matching of the positioning pin 114 and the positioning pin hole 124.
It will be appreciated that the locating pins 114 and locating pin holes 124 are located at the edge of the mould so as not to interfere with the lay-up and subsequent curing of the prepreg, and in practice the number and arrangement of the locating pins will be set as required.
It should be understood that, in practice, the positioning pins 114 may be disposed on the lower mold part 102, and the matching positioning pin holes 124 may be disposed on the upper mold part 101.
In a specific scheme, a guide post 115 is further arranged on the upper die part 101, and a guide hole matched with the guide post 115 is formed in the lower die part 102, so that the upper die part 101 and the lower die part 102 are accurately positioned when being clamped by means of matching of the guide post 115 and the guide hole 126.
Similarly, the guide posts 115 and the guide holes 126 are located at the edge of the mold, and the number and arrangement thereof are set according to actual needs.
Similarly, the guide posts 115 may be disposed on the lower mold part 102, and the matching guide holes 126 may be disposed on the upper mold part 101.
In actual installation, if the plate-shaped member 200 has an inner hole, a column 123 matching the inner hole diameter may be provided at a position corresponding to the inner hole on the lower mold part 102 provided with the boss 121, so that the inner hole structure is directly formed after compression molding without machining.
In the embodiment, in the compression molding process, after the mold is closed, the mold is placed on a molding press for curing and pressurizing.
Referring also to FIG. 4, FIG. 4 is a schematic partial view of an edge portion of a matched ply structure in accordance with an embodiment.
In a specific embodiment, before the mold is closed, an elastic member 103 with a predetermined thickness is placed in a predetermined range of the edge of the surface of the applied layer structure 200'.
After the arrangement, in the subsequent curing and pressurizing process, besides the pressure applied by the molding press, the elastic part 103 can also apply pressure to the edge part of the part under the influence of the temperature, so that the edge part of the part is more fully pressed, the air exhaust is facilitated, the edge part of the part is ensured to have no pores, and the forming quality is better.
The elastic member 103 can be made of rubber, the thickness of the elastic member 103 is 1.5-2.5 mm, the outer edge of the elastic member 103 coincides with the outer edge of the surface of the laid prepreg, and the preset range is 4-6 mm.
In the specific scheme, before the prepreg is laid and attached, a release agent is coated on the surface of a mold, and release cloth is attached; after the prepreg is laid, before the elastic member 103 is placed, a release fabric is laid on the surface of the laid prepreg.
In a specific scheme, after die assembly, the die is placed in a die press, and the curing step comprises the following steps: and (3) not pressurizing, firstly heating to a set temperature, keeping the temperature for a first set time, then pressurizing to a set pressure, simultaneously heating to a curing temperature at a set temperature rise speed, keeping the temperature and the pressure for a second set time, and finally relieving the pressure and reducing the temperature.
The time setting, pressure setting, temperature setting, etc. are set according to the requirements of the actual part to be machined.
For example, in one embodiment, the temperature is raised to 60 ℃ for 30min, then the pressure is increased to 6bar, the temperature is raised to the curing temperature at 2 ℃/min, and the temperature and pressure are maintained for 1 h.
Finally, after the temperature is reduced to normal pressure, the mold is taken out, the elastic piece 103 and the demolding cloth are taken down after demolding, the molded part can be taken out, and the edge of the part can be polished by abrasive paper.
It should also be noted here that in the actual molding process, not only the prepreg may be laid in the mold, but depending on the structural form of the sheet-like component 200 being made, there may also be situations where a core layer is laid, but the provision of the core layer does not affect the handling of the prepreg on both sides of the core layer, i.e. the lay-up involving the prepreg is still in the manner mentioned above.
The above description describes in detail a press molding die and a process for a plate-like member according to the present invention. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (12)
1. The compression molding die is characterized by comprising an upper die part and a lower die part, wherein one of the upper die part and the lower die part is provided with a circle of boss, the area formed by enclosing the boss is matched with the appearance of the plate-shaped part, the outer side of the boss is also provided with a plurality of glue overflowing grooves communicated with the area, the glue overflowing grooves are formed in the upper die part or the lower die part, and the glue overflowing grooves extend to the edge of the corresponding die part.
2. A plate-like member molding die according to claim 1, wherein the height of said boss is 95% of the thickness of the plate-like member edge portion.
3. A press molding die for a plate-like member according to claim 1, wherein a plurality of the flash grooves are arranged at intervals along a circumference of the boss.
4. A press molding die for a plate-like member according to claim 1, wherein the glue overflow groove and the boss are provided in the same die section.
5. A die for compression molding a plate-like member according to claim 1, wherein the plate-like member has at least one inner hole, and the die portion provided with the boss is further provided with a cylinder having a diameter matching the inner hole at a position corresponding to the inner hole.
6. A plate-like member press-molding die according to any one of claims 1 to 5, wherein one of said upper die portion and said lower die portion is provided with a positioning pin, and the other is provided with a positioning pin hole to be fitted with said positioning pin, and said upper die portion and said lower die portion are relatively fixed by fitting of said positioning pin and said positioning pin hole.
7. A plate-like member molding die according to claim 6, wherein one of said upper die portion and said lower die portion is provided with guide posts, and the other is provided with guide holes to be fitted with said guide posts.
8. A press molding process of a plate-like member, using the mold according to any one of claims 1 to 7, the press molding process comprising:
cutting the prepreg, wherein the edge of the plate-shaped component is expanded outwards by a preset size for blanking during cutting;
paving the cut prepreg in the area enclosed by the boss, and cutting and removing the part of the paved prepreg, which exceeds the inner side wall of the boss;
after paving, closing the die.
9. A process for compression molding a plate-like member according to claim 8, wherein an elastic member having a predetermined thickness is further placed within a predetermined range of the edge of the surface of the laid prepreg before the mold is closed.
10. A press molding process for a plate-like member according to claim 9, wherein the thickness of the elastic member is 1.5 to 2.5mm, the outer edge of the elastic member coincides with the outer edge of the surface of the laid prepreg, and the predetermined range is 4 to 6 mm.
11. A press molding process for a plate-like member according to claim 8, wherein the predetermined size is 1.5 to 2.5mm when the prepreg is cut.
12. A press molding process for a plate-like member according to any one of claims 8 to 11, wherein the mold is placed on a press after closing the mold, is not pressurized, is first raised to a set temperature for a first set time, is then pressurized to a set pressure while being raised to a curing temperature at a set temperature raising speed, is kept for a second set time, and is finally depressurized and cooled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011162850.3A CN112454947A (en) | 2020-10-27 | 2020-10-27 | Compression molding die and process for plate-shaped component |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011162850.3A CN112454947A (en) | 2020-10-27 | 2020-10-27 | Compression molding die and process for plate-shaped component |
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| CN112454947A true CN112454947A (en) | 2021-03-09 |
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| CN202011162850.3A Pending CN112454947A (en) | 2020-10-27 | 2020-10-27 | Compression molding die and process for plate-shaped component |
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| CN202388689U (en) * | 2011-09-15 | 2012-08-22 | 上海晋飞复合材料科技有限公司 | Forming device for thermal expansion auxiliary prepregs of silicon sheets |
| CN104827683A (en) * | 2014-02-10 | 2015-08-12 | 汉达精密电子(昆山)有限公司 | Manufacturing method for composite plate and manufactured composite plate |
| CN107488914A (en) * | 2017-08-22 | 2017-12-19 | 西安工程大学 | A kind of carbon fibre composite heald frame of lamination global formation |
| CN108466434A (en) * | 2018-02-11 | 2018-08-31 | 航天材料及工艺研究所 | A kind of more inner cavity I-beams and its high-precision soft mould and technology to control defect method |
| CN108501405A (en) * | 2018-05-30 | 2018-09-07 | 安徽卓尔航空科技有限公司 | A kind of annular excessive glue groove composite propeller compression molding die |
| CN208376049U (en) * | 2018-06-19 | 2019-01-15 | 威海光威复合材料股份有限公司 | The mold of composite material special part compression molding |
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2020
- 2020-10-27 CN CN202011162850.3A patent/CN112454947A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202388689U (en) * | 2011-09-15 | 2012-08-22 | 上海晋飞复合材料科技有限公司 | Forming device for thermal expansion auxiliary prepregs of silicon sheets |
| CN104827683A (en) * | 2014-02-10 | 2015-08-12 | 汉达精密电子(昆山)有限公司 | Manufacturing method for composite plate and manufactured composite plate |
| CN107488914A (en) * | 2017-08-22 | 2017-12-19 | 西安工程大学 | A kind of carbon fibre composite heald frame of lamination global formation |
| CN108466434A (en) * | 2018-02-11 | 2018-08-31 | 航天材料及工艺研究所 | A kind of more inner cavity I-beams and its high-precision soft mould and technology to control defect method |
| CN108501405A (en) * | 2018-05-30 | 2018-09-07 | 安徽卓尔航空科技有限公司 | A kind of annular excessive glue groove composite propeller compression molding die |
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Application publication date: 20210309 |