CN110978358A - Rotational molding preparation process of large plastic product - Google Patents
Rotational molding preparation process of large plastic product Download PDFInfo
- Publication number
- CN110978358A CN110978358A CN201911387443.XA CN201911387443A CN110978358A CN 110978358 A CN110978358 A CN 110978358A CN 201911387443 A CN201911387443 A CN 201911387443A CN 110978358 A CN110978358 A CN 110978358A
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- China
- Prior art keywords
- rotational molding
- heating
- die
- combustion chamber
- cooling
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
- B29C41/06—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould about two or more axes
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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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/46—Heating or cooling
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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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/52—Measuring, controlling or regulating
-
- 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
- B29L2031/52—Sports equipment ; Games; Articles for amusement; Toys
Abstract
The invention relates to the technical field of ships, in particular to a rotational molding preparation process of a large plastic product. The specific steps are coating release agent, filling, avoiding the mould, setting data, heating and cooling and shaping, and the rotational molding mould comprises a left rotational molding mould and a right rotational molding mould, and is pushed into the rotational molding mould of the other side for heating and shaping through the accurate control of PLC when the rotational molding mould of one side is heated and shaped and cooled, so that the heating seamless connection is realized, and the heat loss in a combustion chamber is avoided. The invention has the advantages that: the production efficiency is improved, the occupied area is small, the heating is uniform, and the product quality is high.
Description
Technical Field
The invention relates to the technical field of ships, in particular to a rotational molding preparation process of a large plastic product.
Background
The kayak (canoe and kayak) is a sports event, and is divided into two projects, namely kayak (kayak) and canoe (canoe), wherein the kayak has the difference between a still water project and a torrent project, a competition on the surface of a natural or artificial lake is called a still water project, and a competition on a river channel with rapid water flow is called a torrent project.
The existing kayaks are mostly in rotational molding production modes, and have the defects of low processing speed, difficult quality control, large processing field, easy generation of bubbles in the kayaks, influence on yield, high unreasonable rate and the like.
Disclosure of Invention
The invention aims to provide a rotational molding preparation process of a large plastic product, so as to overcome the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a rotational molding preparation process of a large plastic product comprises a left rotational molding die and a right rotational molding die, and comprises the following steps:
coating a release agent: the rotational molding dies on the two sides are coated with the release agent, so that the product can be conveniently taken out of the die, and the phenomenon of damage of the product during demolding due to high adhesion between the product and the die can be effectively avoided;
filling: metering materials to be added, carrying out premixing treatment, and adding materials required by a workpiece into a rotational molding die;
avoiding a mold: removing the residual material at the die assembly position, ensuring the parting surface to be completely sealed, and avoiding the material leakage in the overturning process;
PLC data setting: setting a swing angle according to the length of the die and the complexity of a molded surface, setting the upper limit and the lower limit of the heating temperature and the heating time of the first stage, setting the upper limit and the lower limit of the heating temperature and the heating time of the second stage, and setting the cooling rotating speed and the cooling time of a cooling system;
heating: under the control of a PLC, pushing a rotational molding die filled with materials on any side into a combustion chamber, wherein the rotational molding die starts to roll in a cavity, the rolling speed is slow, the materials are uniformly distributed in the cavity, the combustion chamber starts to swing, the materials flow to the farthest end of the die and are required to repeatedly roll and swing sometimes, so that the plastics flow to each corner of the die in a preheating stage, the temperature in the combustion chamber rises, a combustion gun at the diagonal corner in the combustion chamber is ignited and heated for the first time, the ignition is stopped after a temperature probe reads out that the preset temperature is reached, the ignition is carried out again after the temperature in the combustion chamber is reduced to a certain temperature, the secondary heating is carried out, the rolling and swinging processes of the rotational molding die can be repeated in the second heating process, the heating is stopped after the set time is reached, and the materials in the die in the rotating process are under the action of gravity and heat energy, the material is gradually and uniformly distributed and fused and adhered to the whole surface of the die cavity, sinks on the whole inner wall of the die cavity and gradually removes gas sandwiched in the material to form the material into a required shape, an exhaust system arranged on the rotational molding die discharges gas from the outside to the inside, the gas is heated by a combustion chamber, hot gas is finally discharged, and the discharged hot gas can spray the thicker part of the die;
cooling and shaping: after heating and forming, pushing the rotational molding die out of the combustion chamber, carrying out accelerated cooling by adopting a cooling system, and cooling by the cooling system while turning over;
demolding and cleaning the mold: and (4) unloading and cleaning the manufactured product, filling the residual sundries on the mold again, and pushing the rotational molding mold on the other side into the combustion chamber for heating.
Preferably, the combustion chamber can automatically swing when heating, so that the heating is more uniform, and the swinging angle of the combustion chamber is 10-45 degrees.
Preferably, the heating is performed for a molding time of generally 10 to 30 minutes.
Preferably, the cooling time is 10 to 60 minutes.
The invention has the beneficial effects that:
1. the left and right rotational molding dies are arranged, when the rotational molding die on one side is heated, molded and cooled, the rotational molding die on the other side is pushed for heating and molding, heating and seamless connection are realized, heat loss in a combustion chamber is avoided, and the rotational molding die is matched with a turnover heating mode in the rotational molding process, so that the production efficiency is improved, the occupied area is small, and the heating is uniform; the combustion guns are arranged in the combustion chamber in the opposite angles, so that the heating is more uniform;
2. the invention is controlled by the PLC control box, can accurately control the swinging of the angle, the rotating speed of rolling, the heating time and the like, and effectively controls the product quality, thereby improving the product quality.
Drawings
FIG. 1 is a schematic view of a rotational molding preparation process of a large plastic product according to the present invention;
in the figure: 1. a rotational molding die; 2. a combustion chamber; 3. an exhaust system; 4. a cooling system; 5. A rocking mechanism; 6. and a PLC control box.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
A rotational molding preparation process of a large plastic product comprises a left rotational molding die and a right rotational molding die, and comprises the following steps:
coating a release agent: the rotational molding dies on the two sides are coated with the release agent, so that the product can be taken out of the die conveniently, and the phenomenon of damage to the product during demolding due to high adhesion between the product and the die can be effectively avoided;
filling: metering materials to be added, carrying out premixing treatment, and adding materials required by a workpiece into a rotational molding die;
avoiding a mold: removing the residual material at the die assembly position, ensuring the parting surface to be completely sealed, and avoiding the material leakage in the overturning process;
PLC data setting: setting a swing angle according to the length of the die and the complexity of a molded surface, setting the upper limit and the lower limit of the heating temperature and the heating time of the first stage, setting the upper limit and the lower limit of the heating temperature and the heating time of the second stage, and setting the cooling rotating speed and the cooling time of a cooling system;
heating: under the control of a PLC, pushing a rotational molding die filled with materials on any side into a combustion chamber, wherein the rotational molding die starts to roll in a cavity, the rolling speed is slow, the materials are uniformly distributed in the cavity, the combustion chamber starts to swing, the materials flow to the farthest end of the die and are required to repeatedly roll and swing sometimes, so that the plastics flow to each corner of the die in a preheating stage, the temperature in the combustion chamber rises, a combustion gun at the diagonal corner in the combustion chamber is ignited and heated for the first time, the ignition is stopped after a temperature probe reads out that the preset temperature is reached, the ignition is carried out again after the temperature in the combustion chamber is reduced to a certain temperature, the secondary heating is carried out, the rolling and swinging processes of the rotational molding die can be repeated in the second heating process, the heating is stopped after the set time is reached, and the materials in the die in the rotating process are under the action of gravity and heat energy, the material is gradually and uniformly distributed and fused and adhered to the whole surface of the die cavity, sinks on the whole inner wall of the die cavity and gradually removes gas sandwiched in the material to form the material into a required shape, an exhaust system arranged on the rotational molding die discharges gas from the outside to the inside, the gas is heated by a combustion chamber, hot gas is finally discharged, and the discharged hot gas can spray the thicker part of the die;
cooling and shaping: after heating and forming, pushing the rotational molding die out of the combustion chamber, carrying out accelerated cooling by adopting a cooling system, and cooling by the cooling system while turning over;
demolding and cleaning the mold: and (4) unloading and cleaning the manufactured product, filling the residual sundries on the mold again, and pushing the rotational molding mold on the other side into the combustion chamber for heating.
The combustion chamber can automatically swing when heated, so that the heating is more uniform, and the swinging angle of the combustion chamber is 10-45 degrees. The heating is generally carried out for a molding time of 10 to 30 minutes. The cooling time is 10-60 minutes.
In the implementation case, as shown in fig. 1, a release agent is coated on the rotational molding dies 1 on both sides, materials to be added are measured, premixing treatment is carried out, materials required by a finished piece are added into the rotational molding dies 1, materials remaining at a die assembly position are removed, after a parting surface is ensured to be completely filled in a sealing manner, a PLC control box 6 is operated, the rotational molding dies on any side filled with the materials are pushed into a combustion chamber 2, the rotational molding dies 1 start to roll in the cavity, the rolling speed is slow, the materials are uniformly distributed in the cavity, the combustion chamber 2 starts to swing, the materials flow to the farthest end of the dies, rolling and swinging are carried out repeatedly sometimes, so that the plastics flow to each corner of the dies in a preheating stage, the temperature in the combustion chamber 2 is raised, a combustion gun on the opposite corner in the combustion chamber is ignited for heating for the first time, when the heating temperature reaches 340 ℃, the heating time is 6 minutes, during the period, the combustion chamber stays horizontally, the ignition is stopped after the temperature probe reads that the preset temperature is reached, the ignition is stopped, the temperature in the combustion chamber is reduced to a certain temperature and then the ignition is carried out again, the second heating is carried out, the heating temperature is up to 320 ℃, the heating time is 7 minutes, in the second heating process of the rotational molding die, the swinging mechanism 5 can repeat the rolling and swinging process, the left-right swinging angle is 23 degrees, after the set time is reached, the heating is stopped, the material in the die is gradually and uniformly distributed and fused and adhered to the whole surface of the die cavity under the action of gravity and heat energy in the rotating process, the material sinks on the whole inner wall of the die cavity and gradually removes the gas clamped in the material, the material is molded into the required shape, the exhaust system 2 arranged on the rotational molding die 1 discharges the gas from the outside to the inside, the gas is heated by the combustion chamber 1, and finally discharges hot, the discharged hot air can be sprayed to the thicker part of the mold, the left rotational molding mold 1 is moved out of the combustion chamber 2 after molding, the cooling system 4 is adopted for accelerated cooling, the left rotational molding mold 1 is cooled through the cooling system while being overturned, cooling is completed within 15 minutes, demolding is prepared, filling preparation is carried out again, when the left rotational molding mold 1 is pushed out, the right rotational molding mold 1 is pushed into the combustion chamber 2 for heating, the rotational molding molds 1 on the left side and the right side alternately operate, and production is improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. The rotational molding preparation process of the large plastic product comprises a left rotational molding die and a right rotational molding die, and is characterized by comprising the following steps of:
coating a release agent: the rotational molding dies on the two sides are coated with the release agent, so that the product can be conveniently taken out of the die, and the phenomenon of damage of the product during demolding due to high adhesion between the product and the die can be effectively avoided;
filling: metering materials to be added, carrying out premixing treatment, and adding materials required by a workpiece into a rotational molding die;
avoiding a mold: removing the residual material at the die assembly position, ensuring the parting surface to be completely sealed, and avoiding the material leakage in the overturning process;
PLC data setting: setting a swing angle according to the length of the die and the complexity of a molded surface, setting the upper limit and the lower limit of the heating temperature and the heating time of the first stage, setting the upper limit and the lower limit of the heating temperature and the heating time of the second stage, and setting the cooling rotating speed and the cooling time of a cooling system;
heating: under the control of a PLC, pushing a rotational molding die filled with materials on any side into a combustion chamber, wherein the rotational molding die starts to roll in a cavity, the rolling speed is slow, the materials are uniformly distributed in the cavity, the combustion chamber starts to swing, the materials flow to the farthest end of the die and are required to repeatedly roll and swing sometimes, so that the plastics flow to each corner of the die in a preheating stage, the temperature in the combustion chamber rises, a combustion gun at the diagonal corner in the combustion chamber is ignited and heated for the first time, the ignition is stopped after a temperature probe reads out that the preset temperature is reached, the ignition is carried out again after the temperature in the combustion chamber is reduced to a certain temperature, the secondary heating is carried out, the rolling and swinging processes of the rotational molding die can be repeated in the second heating process, the heating is stopped after the set time is reached, and the materials in the die in the rotating process are under the action of gravity and heat energy, the material is gradually and uniformly distributed and fused and adhered to the whole surface of the die cavity, sinks on the whole inner wall of the die cavity and gradually removes gas sandwiched in the material to form the material into a required shape, an exhaust system arranged on the rotational molding die discharges gas from the outside to the inside, the gas is heated by a combustion chamber, hot gas is finally discharged, and the discharged hot gas can spray the thicker part of the die;
cooling and shaping: after heating and forming, pushing the rotational molding die out of the combustion chamber, carrying out accelerated cooling by adopting a cooling system, and cooling by the cooling system while turning over;
demolding and cleaning the mold: and (4) unloading and cleaning the manufactured product, filling the residual sundries on the mold again, and pushing the rotational molding mold on the other side into the combustion chamber for heating.
2. The rotational molding preparation process of a large plastic product according to claim 1, characterized in that: the combustion chamber can automatically swing when heated, so that the heating is more uniform, and the swinging angle of the combustion chamber is 10-45 degrees.
3. The rotational molding preparation process of a large plastic product according to claim 1, characterized in that: the heating is generally carried out for a molding time of 10 to 30 minutes.
4. The rotational molding preparation process of a large plastic product according to claim 1, characterized in that: the cooling time is 10-60 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911387443.XA CN110978358A (en) | 2019-12-30 | 2019-12-30 | Rotational molding preparation process of large plastic product |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911387443.XA CN110978358A (en) | 2019-12-30 | 2019-12-30 | Rotational molding preparation process of large plastic product |
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| CN110978358A true CN110978358A (en) | 2020-04-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117681346A (en) * | 2024-01-31 | 2024-03-12 | 湖南科森高分子材料科技有限公司 | Low-smoke halogen-free flame-retardant polyolefin insulating material forming device and forming process thereof |
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| CN102431111A (en) * | 2011-12-09 | 2012-05-02 | 江苏通全球工程管业有限公司 | Two-station rotational molding device |
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| CN110561671A (en) * | 2019-08-27 | 2019-12-13 | 丽水学院 | Rotational molding die and machining process thereof |
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2019
- 2019-12-30 CN CN201911387443.XA patent/CN110978358A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1085490A (en) * | 1993-10-06 | 1994-04-20 | 张基 | A kind of production method of massive rotationally moulded products and equipment |
| CN101032853A (en) * | 2006-03-07 | 2007-09-12 | 长春一汽四环恒兴汽车零部件有限公司 | Multipoint heating device of rotomoulding forming device |
| CN1850483A (en) * | 2006-05-19 | 2006-10-25 | 慈溪市德顺容器有限公司 | Programme control method for revolving moulding machine |
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| CN102431111A (en) * | 2011-12-09 | 2012-05-02 | 江苏通全球工程管业有限公司 | Two-station rotational molding device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117681346A (en) * | 2024-01-31 | 2024-03-12 | 湖南科森高分子材料科技有限公司 | Low-smoke halogen-free flame-retardant polyolefin insulating material forming device and forming process thereof |
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Application publication date: 20200410 |
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