CN111923328A - Preparation method of infrared heating compression molding fiber reinforced composite seat side plate - Google Patents
Preparation method of infrared heating compression molding fiber reinforced composite seat side plate Download PDFInfo
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- CN111923328A CN111923328A CN202010946518.XA CN202010946518A CN111923328A CN 111923328 A CN111923328 A CN 111923328A CN 202010946518 A CN202010946518 A CN 202010946518A CN 111923328 A CN111923328 A CN 111923328A
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- fiber reinforced
- continuous fiber
- reinforced thermoplastic
- thermoplastic composite
- sheet
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14065—Positioning or centering articles in the mould
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
- B29C45/14786—Fibrous material or fibre containing material, e.g. fibre mats or fibre reinforced material
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/7207—Heating or cooling of the moulded articles
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a preparation method of an infrared heating compression molding fiber reinforced composite seat side plate, which comprises the following steps: s1, carrying out die pressing forming on the continuous fiber reinforced thermoplastic composite material sheet cut according to the designed shape; s2, hanging the sheet material subjected to compression molding at a preset position in a fixed mold, wherein the preset position is the position of the continuous fiber reinforced thermoplastic composite material after the product is molded; s3, extending an infrared heater into the fixed die to heat the continuous fiber reinforced thermoplastic composite material sheet to melt the resin on the surface of the continuous fiber reinforced thermoplastic composite material; and S4, after the infrared heater exits from the fixed die, closing the movable die and the fixed die for injection molding to obtain the seat side plate. The invention can improve the position precision of the continuous fiber reinforced thermoplastic composite material sheet in a finished product, enhance the binding force of the sheet and an injection molding part and improve the product percent of pass.
Description
Technical Field
The invention relates to a preparation method of an automobile seat side plate, in particular to a preparation method of an infrared heating compression molding fiber reinforced composite seat side plate.
Background
With the continuous development of the light weight of the automobile, more and more automobile parts are replaced by lighter parts or structures which can meet the requirements, and in view of the characteristics of high strength and thermoplasticity of the continuous fiber reinforced thermoplastic composite material, the application prospect of the continuous fiber reinforced thermoplastic composite material in the field of light weight of the automobile is better. The continuous fiber reinforced thermoplastic composite material is used as a reinforcing part of a plastic product with weak strength, rigidity and tensile resistance, so that the performance of the part can be enhanced to meet the test requirements of the corresponding product in automobile parts and finished automobile tests. The existing injection molding method adopting the continuous fiber reinforced thermoplastic composite material as the reinforcing part is to heat and soften the sheet of the continuous fiber reinforced thermoplastic composite material, clamp the sheet by a clamp and hang the sheet on a fixed mold of the mold, control a movable mold of the mold to mold and then perform injection molding and molding. The preparation process has two biggest problems, namely, when the sheet is hung, the heated sheet is softer, and the heating speed in the moving process of the clamp is influenced, so that the sheet can be damaged, dropped and shifted in production, and the clamp can vibrate slightly in the moving process, so that the hung and softened sheet can deform; secondly, the time from the clamp leaving the heater to the clamp withdrawing from the die is 20 to 30 seconds, the softened sheet is in the air in the process, the heat dissipation is fast, the resin can not keep a molten state, PP plastic particles can hit the cooled continuous fiber reinforced thermoplastic composite sheet in a short time after die assembly, the two materials can not be combined in the molten state of the resin on the surface of the sheet, and the strength of the product is affected due to insufficient bonding force between the two materials. Both of the above two aspects result in the qualification rate of the product being greatly influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a preparation method of an infrared heating compression molding fiber reinforced composite seat side plate, which solves the problems of deformation of a continuous fiber reinforced thermoplastic composite material sheet after heating and softening and low product percent of pass caused by poor bonding force of an injection molding material and the composite material sheet.
The technical scheme of the invention is as follows: a preparation method of an infrared heating compression molding fiber reinforced composite seat side plate comprises the following steps: s1, carrying out die pressing forming on the continuous fiber reinforced thermoplastic composite material sheet cut according to the designed shape; s2, hanging the sheet material subjected to compression molding at a preset position in a fixed mold, wherein the preset position is the position of the continuous fiber reinforced thermoplastic composite material after the product is molded; s3, extending an infrared heater into the fixed die to heat the continuous fiber reinforced thermoplastic composite material sheet to melt the resin on the surface of the continuous fiber reinforced thermoplastic composite material; and S4, after the infrared heater exits from the fixed die, closing the movable die and the fixed die for injection molding to obtain the seat side plate.
Further, when the fixed die is stretched into the fixed die to heat the continuous fiber reinforced thermoplastic composite material sheet, an infrared heater is used for stretching into the fixed die, and the distance between the fixed die and the continuous fiber reinforced thermoplastic composite material sheet is 10-20 mm below a connecting line of hanging holes of the continuous fiber reinforced thermoplastic composite material sheet, so that the surface temperature of the part, located above the distance, of the continuous fiber reinforced thermoplastic composite material sheet is lower than the surface temperature of the part, located below the distance, of the continuous fiber reinforced thermoplastic composite material sheet.
The upper part and the lower part are distinguished by taking the boundary as a boundary, so that the sheet material of the lower part is fully heated and softened, and the sheet material hanging hole and the upper area are not completely softened (the shape is maintained), so that the mold has good plasticity.
Further, the difference in surface temperature between the portion of the continuous fiber-reinforced thermoplastic composite sheet located above the boundary line and the portion of the continuous fiber-reinforced thermoplastic composite sheet located below the boundary line is 10 to 20 ℃.
Further, when the infrared heater heats the continuous fiber reinforced thermoplastic composite material sheet, heater outer covers are added around the infrared heater, the outline of the heater outer covers is matched with the outline of the outer edge of the continuous fiber reinforced thermoplastic composite material sheet, and the infrared heater, the heater outer covers and the fixed die surround the continuous fiber reinforced thermoplastic composite material sheet. Adopt dustcoat parcel formula heating phase to compare the embedded heating of cover half, can prevent effectively that the sheet from dispelling the heat at the excessive speed, the embedded heating of cover half will make sheet surface melting can make sheet bulk temperature too high, and too high bulk temperature can make the sheet of hanging change the deformation, is unfavorable for the shaping, and the embedded heating of cover half is direct contact heating in addition, and infrared heater then can realize the surperficial even heating of bigger area, makes sheet surface temperature homogeneity better.
Further, in order to ensure that the heated sheet loses shape and affects the appearance shape of a finished product, when the movable mold and the fixed mold are assembled, the movable mold and the fixed mold are firstly integrally assembled, the sheet is compacted to the fixed mold by the movable mold, and then the movable block of the movable mold located at the position of the sheet reversely retracts in the mold assembling direction to reserve an injection molding space for injection molding.
Further, when the movable mold and the fixed mold are closed, the initial closing speed of the movable mold is 150-200 mm/s, and when the movable mold is 20-25 mm away from the fixed mold, the final closing speed of the movable mold is 5-8 mm/s.
Further, when the movable mold is 200-220 mm away from the fixed mold, the mold closing speed of the movable mold is reduced from the initial mold closing speed to the final mold closing speed.
Compared with the prior art, the invention has the advantages that:
the continuous fiber reinforced thermoplastic composite material sheet suspended in the fixed die is heated to be softened, then die assembly is carried out to carry out die pressing and injection molding, at the moment, the resin is in a molten state, the continuous fiber reinforced thermoplastic composite material can be better combined with the PP material, the shape of the sheet is basically not influenced by the interference of external factors in the whole process, the deviation between the position where the sheet is finally positioned to the fixed die and the design position is very small, and the qualification rate of the prepared product is improved to be more than 90 percent from the original 60 percent. In addition, the method of the invention has no contradiction that the sheet material can not move quickly after being heated and needs to be injected quickly to avoid poor binding force caused by the surface cooling of the sheet material when the continuous fiber reinforced thermoplastic composite material sheet material is moved, can operate the continuous fiber reinforced thermoplastic composite material sheet material quickly, and reduces the heating temperature and time compared with the prior art because the heat loss when the sheet material is moved does not need to be considered, shortens the process beat on the whole and improves the production efficiency.
Drawings
Fig. 1 is a schematic view of a continuous fiber reinforced thermoplastic composite sheet for preparing a seat side panel of an example.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention thereto.
The preparation method of the infrared heating compression molding fiber reinforced composite seat side plate related to the embodiment comprises the following steps:
s1, carrying out die pressing forming on the continuous fiber reinforced thermoplastic composite material sheet cut according to the designed shape; the shape of the continuous fiber reinforced thermoplastic composite material (CFRT) sheet used by the invention is shown in figure 1, the length and the width are about 200mm multiplied by 120mm, two hanging holes A at the upper left corner and the upper right corner of the sheet correspond to hanging needles on an injection mold, the cross section of the hanging needle hanging position is the same as that of the hanging hole A, so that the position of the sheet is prevented from being deviated under the action of gravity.
S2, after preheating equipment and drying the PP raw material, hanging the sheet material subjected to compression molding at a preset position in a fixed die through a hanging needle, wherein the preset position is the position of the continuous fiber reinforced thermoplastic composite material after the product is molded;
and S3, arranging a plurality of heat energy blocks on the surface of the infrared heater, and controlling the infrared heater to move into the fixed die by the mechanical arm. The infrared heater is additionally provided with the heater outer cover, the outline of the heater outer cover is matched with the outline of the outer edge of the continuous fiber reinforced thermoplastic composite material sheet, the continuous fiber reinforced thermoplastic composite material sheet is surrounded by the infrared heater, the heater outer cover and the fixed die, so that the infrared heater can more uniformly and uniformly heat the surface of the molded sheet, the heat leakage is reduced, and the heating time is shortened. Adopt infrared heater to heat and compare at the embedded heating rod of cover half can the direct heating sheet surface and need not to make the sheet wholly soften, improved efficiency and also stereotyped more easily, and the homogeneity is better. During heating, taking 10-20 mm below a connecting line L1 of a hanging hole A of the continuous fiber reinforced thermoplastic composite material sheet as a boundary line L2 (15 mm in the embodiment), firstly opening a heating wire on an infrared heater corresponding to the part of the continuous fiber reinforced thermoplastic composite material sheet below a boundary line L2, setting the temperature of the heating wire at 170-200 ℃, after the temperature is reached, continuously heating for 30-40 s, opening the heating wire on the infrared heater corresponding to the part of the continuous fiber reinforced thermoplastic composite material sheet above the boundary line L2, keeping the temperature of the heating wire at 160-190 ℃, continuously heating for 40-60 s, ensuring that the surface temperature difference between the part of the continuous fiber reinforced thermoplastic composite material sheet above the boundary line L2 and the part of the continuous fiber reinforced thermoplastic composite material sheet below the boundary line L2 is 10-20 ℃, and fully heating the continuous fiber reinforced thermoplastic composite material sheet until surface resin is melted, and then closing the infrared heater, and controlling the mechanical arm to enable the infrared heater to exit the fixed die. Since the sheet is brought to the finished shape by the press molding in step S1, the preliminary press molding makes it unnecessary to soften the sheet as a whole as in the prior art when the sheet is heated in this step, and only the surface melting is required.
S4, controlling the movable mold to approach the fixed mold at a speed of 150-200 mm/S, starting to decelerate at a constant speed at a position 200mm away from the fixed mold, and closing the mold at a low speed of about 5-8 mm/S at a position 20mm away from the fixed mold to ensure that the continuous fiber reinforced thermoplastic composite material sheet can be smoothly and accurately compacted on the fixed mold when the movable mold moves integrally, and then reversely returning the movable block of the movable mold at the corresponding position of the sheet to the mold closing direction by 2mm to reserve a space for injection molding a PP material, and then injection molding the whole seat side plate product.
Claims (7)
1. A preparation method of an infrared heating compression molding fiber reinforced composite seat side plate is characterized by comprising the following steps: s1, carrying out die pressing forming on the continuous fiber reinforced thermoplastic composite material sheet cut according to the designed shape; s2, hanging the sheet material subjected to compression molding at a preset position in a fixed mold, wherein the preset position is the position of the continuous fiber reinforced thermoplastic composite material after the product is molded; s3, extending an infrared heater into the fixed die to heat the continuous fiber reinforced thermoplastic composite material sheet to melt the resin on the surface of the continuous fiber reinforced thermoplastic composite material; and S4, after the infrared heater exits from the fixed die, closing the movable die and the fixed die for injection molding to obtain the seat side plate.
2. The method for manufacturing an infrared heating compression molded fiber reinforced composite seat side panel according to claim 1, wherein the continuous fiber reinforced thermoplastic composite sheet is heated by extending an infrared heater into the fixed mold, and the surface temperature of the portion of the continuous fiber reinforced thermoplastic composite sheet located above the boundary line is lower than the surface temperature of the portion of the continuous fiber reinforced thermoplastic composite sheet located below the boundary line by taking 10 to 20mm below the connecting line of the hanging holes of the continuous fiber reinforced thermoplastic composite sheet as the boundary line.
3. The method for producing an infrared heating compression molded fiber reinforced composite seat side panel according to claim 2, wherein the difference in surface temperature between the portion of the continuous fiber reinforced thermoplastic composite sheet located above the dividing line and the portion of the continuous fiber reinforced thermoplastic composite sheet located below the dividing line is 10 to 20 ℃.
4. The method of claim 1, wherein a heater cover is added around the infrared heater when the infrared heater heats the continuous fiber reinforced thermoplastic composite sheet material, the heater cover has a contour corresponding to the contour of the outer edge of the continuous fiber reinforced thermoplastic composite sheet material, and the infrared heater, the heater cover and the fixed mold enclose the continuous fiber reinforced thermoplastic composite sheet material.
5. The method for manufacturing the infrared heating compression molding fiber reinforced composite seat side plate according to claim 1, wherein when the movable mold and the fixed mold are assembled, the movable mold is firstly integrally assembled with the fixed mold, the sheet is compacted to the fixed mold by the movable mold, and then the movable block of the movable mold located at the position of the sheet is retracted reversely to the mold assembling direction to leave an injection molding space for injection molding.
6. The method for preparing the infrared heating compression molding fiber reinforced composite seat side plate according to claim 1, wherein when the movable mold and the fixed mold are closed, the initial closing speed of the movable mold is 150-200 mm/s, and when the movable mold is 20-25 mm away from the fixed mold, the final closing speed of the movable mold is 5-8 mm/s.
7. The method for manufacturing an infrared heating compression molded fiber reinforced composite seat side plate according to claim 6, wherein when the movable mold is located 200 to 220mm away from the fixed mold, the mold closing speed of the movable mold is reduced from the initial mold closing speed to the final mold closing speed.
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| CN202010946518.XA CN111923328B (en) | 2020-09-10 | 2020-09-10 | Preparation method of infrared heating compression molding fiber reinforced composite seat side plate |
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| CN202010946518.XA CN111923328B (en) | 2020-09-10 | 2020-09-10 | Preparation method of infrared heating compression molding fiber reinforced composite seat side plate |
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| CN111923328B CN111923328B (en) | 2022-08-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115782245A (en) * | 2023-02-14 | 2023-03-14 | 中南大学 | Rapid forming method of continuous fiber reinforced thermoplastic composite material composite member |
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| CN111923328B (en) | 2022-08-26 |
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Address after: 215500 No. 288, Hai Yu Bei Road, Changshou City, Suzhou, Jiangsu. Patentee after: Jiangsu Changshu automobile decoration Group Co.,Ltd. Address before: 215500 No. 288, Hai Yu Bei Road, Changshou City, Suzhou, Jiangsu. Patentee before: CHANGSHU AUTOMOTIVE TRIM Co.,Ltd. |
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