CN111251622A - Efficient and economical sheet plastic part forming process method - Google Patents
Efficient and economical sheet plastic part forming process method Download PDFInfo
- Publication number
- CN111251622A CN111251622A CN202010174636.3A CN202010174636A CN111251622A CN 111251622 A CN111251622 A CN 111251622A CN 202010174636 A CN202010174636 A CN 202010174636A CN 111251622 A CN111251622 A CN 111251622A
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- Prior art keywords
- plastic
- sheet
- female
- die
- male
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
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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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/04—Combined thermoforming and prestretching, e.g. biaxial stretching
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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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/30—Moulds
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
The invention discloses an efficient and economic sheet plastic part forming process method, which comprises the following steps: step 1), heating a plastic raw material by an extruder, and extruding a softened plastic sheet downwards by a die head; step 2) clamping the softened plastic sheet by the female die and the male die, and attaching the softened plastic sheet to a die cavity through positive and negative pressure combination to form a sheet plastic part; the invention provides a forming process method of sheet plastic parts, which comprises the steps of timely extruding plastic sheets, timely forming plastic parts, sequentially matching a plurality of female dies through a pair of male dies, generating plastic part products with two die cavities in each matching, separating the plastic parts and waste materials when the female dies are matched with the male dies, sucking and blowing the formed plastic parts, simultaneously cooling the plastic parts, and applying positive pressure to the female dies to separate the plastic parts from the female dies for taking the plastic parts; effectively reduce the energy consumption of sheet working of plastics shaping whole in-process, improve economic nature, improve production efficiency.
Description
Technical Field
The invention relates to a plastic part forming process, in particular to a sheet plastic part forming process.
Background
The traditional sheet plastic part forming process is generally a plastic suction forming process.
For the plastic suction process, firstly, plastic particles or powder raw materials are heated and then a plastic sheet is extruded through a die head; then the manufacturer buys the plastic sheet, heats the cooled plastic sheet, then places the plastic sheet in a plastic suction mould to suck negative pressure, leads the softened plastic sheet and the mould to be tightly adhered and formed, sprays cooling liquid on the outer side to cool, takes out the plastic piece with the waste, then removes the waste through a cutting or punching process, and finally forms the plastic piece, which is shown in detail in figure 1. Firstly, plastic sheet forming and plastic piece plastic-suction forming are respectively subjected to a heating and cooling process, so that the energy consumption is large, in addition, the processes of production, transportation, storage and the like of the plastic sheets are complicated, the plastic piece plastic-suction process is complicated, and the like, so that the whole production process is not economical; secondly, only one plastic sheet can be blister-molded by one die at a time, and the subsequent processes of removing waste materials and the like are performed, so that the production efficiency is low; finally, the plastic suction process usually only uses a female mold to suck the plastic sheet by negative pressure, and for thicker plastic sheets, the negative pressure suction causes the plastic piece to be formed with inaccurate dimensions due to small suction force.
In view of the current situation, it is necessary to develop a sheet plastic part forming process that can solve the above problems.
Disclosure of Invention
The invention aims to provide an efficient and economical sheet plastic part forming process method, which solves the problems of poor economy, low production efficiency and inaccurate forming size of a thick plastic part of the traditional process, and ensures that the sheet plastic part has excellent economy, high production efficiency and excellent dimensional precision of the plastic part.
The purpose of the invention is realized as follows: an efficient and economical sheet plastic part forming process method comprises the following steps:
step 1), heating a plastic raw material by an extruder, and extruding a softened plastic sheet downwards by a die head;
and 2) clamping the softened plastic sheet by the female die and the male die, and attaching the softened plastic sheet to a die cavity of the die through positive and negative pressure combination to form a sheet plastic part.
As a further limitation of the invention, the die head simultaneously extrudes two plastic sheets, which are suspended on either side of the female die.
As a further limitation of the present invention, the female mold is provided with one female mold, the male mold is provided with two male molds, one female mold has two molding cavities on the front side and the back side, and one male mold has only one molding cavity on one side; one female die simultaneously matched with two male dies
As a further limitation of the invention, in step 2), after the two are mated to a preformed plastic part, positive pressure is applied to the male mold cavity and negative pressure is applied to the female mold cavity to bond the plastic sheet to the female mold.
As a further limitation of the invention, the die in step 1) may adjust the wall thickness profile of the plastic sheet extruded downwardly therefrom.
As a further limitation of the invention, in step 2) the female and male mould cavities are mated by pressing the plastic sheet against the mating portions to completely or nearly separate the plastic part from the waste part.
As a further limitation of the invention, after the female mold and the male mold are separated, the female mold cavity maintains negative pressure to shape the plastic part; and applying positive pressure to the female die cavity to separate the plastic part from the female die cavity and take the plastic part.
As a further limitation of the invention, the plastic part may be formed by a plurality of female dies respectively mating the plastic sheet with two male dies at different times.
As a further limitation of the invention, the plastic sheet extruded downwardly from the die may be a single layer or a multi-layer structure composed of different materials.
As a further limitation of the present invention, the sheet plastic part may be formed of only a softened plastic sheet, or may be formed of a plastic sheet in combination with an object on which a female mold and a male mold are previously placed.
Compared with the prior art, the invention has the beneficial effects that: the invention extrudes plastic sheets in time, forms plastic pieces in time, sequentially matches a plurality of female dies through a pair of male dies, can generate plastic piece products with two die cavities each time, separates the plastic pieces and waste materials when the female dies are matched with the male dies, sucks and blows the formed plastic pieces and cools the plastic pieces at the same time, and applies positive pressure to the female dies to separate the plastic pieces from the female dies for taking the pieces; effectively reduce the energy consumption of sheet working of plastics shaping whole in-process, improve economic nature, improve production efficiency. Meanwhile, the plastic sheet is attached to the female die through the combination of positive pressure and negative pressure generated by the female die and the male die, so that the forming size precision of the plastic part with the thicker sheet is effectively improved.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic process flow diagram of a conventional sheet material suction molding technology.
FIG. 2 is a schematic process flow diagram of a sheet plastic part molding technique according to the present invention.
FIG. 3 is a schematic view of a core tooling of the sheet plastic part molding process of the present invention.
Fig. 4 is a schematic view of the principle of extrusion and suction-blowing of the plastic sheet by the female and male molds of the present invention.
Fig. 5 is a schematic representation of the release of a plastic part of the invention from a female mold.
Fig. 6 is a first schematic step of a sheet plastic part molding process according to an embodiment of the present invention.
Fig. 7 is a second schematic step of a sheet plastic part molding process according to an embodiment of the present invention.
Description of reference numerals: 100-die head, 210-male die (1), 220-male die (2), 310-female die (1), 410-plastic sheet (1), 420-plastic sheet (2), 500-fixed guide rail, 320-female die (2), 330-female die (3), 340-female die (4), 610-plastic piece (1), 620-plastic piece (2) and 700-robot hand.
Detailed Description
An efficient and economical process for forming sheet plastic parts, as shown in fig. 2, comprises the steps of:
step 1), heating a plastic raw material by an extruder, and extruding a softened plastic sheet downwards by a die head;
and 2) clamping the softened plastic sheet by the female die and the male die, and attaching the softened plastic sheet to a die cavity of the die through positive and negative pressure combination to form a sheet plastic part.
Referring to fig. 3, the die head 100 is stationary above; the male die (1) 210 and the male die (2) 220 move relatively towards the female die (1) 310, and are respectively matched with two surfaces of the female die (1) to form a plastic piece, and the plastic piece moves backwards to a starting position after being formed, and the process is repeated; the female mold (1) 310 is guided along a stationary rail 500 directly below the die head 100 before the plastic part is formed, and can be moved to one side along the stationary rail 500 after the male mold is retracted, so as to continue cooling and removing the plastic part, and so on.
Referring to fig. 4, when the male mold (1) 210 and the male mold (2) 220 move relatively close to the female mold (1) 310, the male mold and the female mold perform extrusion and stretching on the softened plastic sheet (1) 410 and the plastic sheet (2) 420, so that the plastic sheet is pre-stretched, i.e. pre-formed; when the male die (1) 210, the male die (2) 220 and the female die (1) 310 are contacted with each other and completely closed, the male die and the female die exert extrusion cutting force on the plastic sheet at the contact position, so that the outer contours of the plastic piece (1) 610 and the plastic piece (2) 620 are basically formed, namely, the plastic piece and the waste material part are completely separated or nearly separated; after the male die and the female die are completely closed, positive pressure (the positive pressure can be up to 10 kilograms) is applied from the male die cavity, negative pressure (the negative pressure can be up to 1 kilogram) is applied from the female die cavity, so that the softened plastic sheet is completely attached to the female die, and after the attachment, particularly, a cooling system in the female die cavity rapidly cools the plastic piece which is still at high temperature.
Referring now to fig. 5, the negative pressure is maintained until the plastic part (1) 610 and the plastic part (2) 620 are removed from the female mold (1) 310 to continue shaping the plastic part; and after the female die finishes shaping the plastic part, applying positive pressure from the cavity of the female die to separate the plastic part from the female die and taking out the plastic part.
The following detailed description of embodiment 1 of the present invention provides a schematic illustration of the steps of a sheet plastic part molding process, and referring to fig. 6, the embodiment described by referring to the drawings is exemplary only and should not be construed as limiting the invention. The process method comprises the following steps: firstly, extruding two plastic sheets by a die head (100), and simultaneously placing a female die (1) 310 under the die head (100), if an embedded object exists, placing the embedded object in cavities of the female die and the male die simultaneously; secondly, the male die (1) 210 and the male die (2) 220 relatively move towards the female die (1) 310, and are respectively matched with the two surfaces of the female die (1) 210, so that the female die and the male die are used for extruding and sucking and blowing the formed plastic part as described above (refer to fig. 4); third, the male mold (1) 210 and the male mold (2) 220 are retreated back to the original positions while the female mold (1) 310 is moved to one side (refer to the right side of fig. 6) along the fixed rail 500; a fourth step of performing the first to third steps based on the female mold (2) 320, except that the female mold (1) 310 is finally moved to the left side with reference to fig. 6 along the fixed rail, and performing the processes of continuously shaping and taking out the plastic parts while the female mold (2) 320 is performing the processes, with reference to the schematic illustration of fig. 5; in the fifth step, the female mold (2) 320 performs the processes of continuously shaping and taking out the plastic parts, and at the same time, the female mold (1) 310 performs the above first to third steps. And finally, the male die is sequentially matched with the female die (1) 310 and the female die (2) 320 to complete related processes, the female die (1) 310 and the female die (2) 320 are mutually alternated according to the process rhythm, the whole plastic part forming process is implemented, and continuous, complete and sustainable process steps are formed.
The following describes embodiment 2 of the present invention in detail, and provides a second schematic step of a sheet plastic part molding process, and please refer to fig. 7, wherein the embodiment described by referring to the drawings is exemplary and only used for explaining the present invention, but not to be construed as limiting the present invention. The process steps for forming plastic parts from sheet material are schematically discussed in reference to fig. 6, except that: increasing the female mold plastic when the speed of the die head (100) extruding the plastic sheet allows, as with reference to fig. 7, the female mold (1) 310, the female mold (2) 320, the female mold (3) 330 and the female mold (4) 340, all of which are not in the original position above the fixed rail 500, and are lifted by a robot (for example, the robot 700) onto the fixed rail 500 when the cycle is timed; in addition, in order to avoid the position conflict of the 4 female dies on the fixed guide rail, after the female dies are separated from the male dies, the corresponding female dies can be taken out of the fixed guide rail by a robot hand immediately, and the subsequent working procedures of shaping the plastic piece and taking out the plastic piece are implemented.
The invention provides a high-efficiency and economical sheet plastic part forming process method and a tool combination, wherein a plastic sheet is extruded in time to form a plastic part in time, a pair of male dies are sequentially matched with a plurality of female dies, plastic part products with two die cavities can be generated in each matching, the plastic part and waste materials are separated when the female dies are matched with the male dies, the plastic part is formed by suction and blowing, and the plastic part is separated from the female dies to be taken by applying positive pressure to the female dies; the energy consumption in the whole process of forming the sheet plastic part is effectively reduced, the economical efficiency is improved, and the production efficiency is improved, like the embodiment 1, the energy consumption can be reduced by 1 time compared with the traditional plastic suction process, and the production efficiency can be improved by 3-4 times compared with the traditional plastic suction process; as example 2, the energy consumption can be reduced by 1-2 times and the production efficiency can be increased by 6-8 times. The plastic sheet is attached to the female die through the combination of positive pressure and negative pressure generated by the female die and the male die, so that the forming size precision of a thicker sheet plastic part is effectively improved, particularly the sheet plastic part with larger corners can be improved by 5-10 times.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (10)
1. An efficient and economical sheet plastic part forming process method is characterized by comprising the following steps:
step 1), heating a plastic raw material by an extruder, and extruding a softened plastic sheet downwards by a die head;
and 2) clamping the softened plastic sheet by the female die and the male die, and attaching the softened plastic sheet to a die cavity of the die through positive and negative pressure combination to form a sheet plastic part.
2. A process for forming a highly efficient and economical plastic part from sheet material as claimed in claim 1 wherein said die head simultaneously extrudes two plastic sheets, each of which is suspended on either side of a female die.
3. An efficient and economical process for forming sheet plastic parts as claimed in claim 1 wherein said female mold is provided with one and said male mold is provided with two, one female mold having two molding cavities on opposite sides and one male mold having only one molding cavity on one side; a female die is simultaneously matched with two male dies.
4. A process for forming a highly efficient and economical sheet material of plastic parts as in claim 1 wherein in step 2) after the two have been mated to form the pre-formed plastic part, positive pressure is applied to the male mold cavity and negative pressure is applied to the female mold cavity to bond the plastic sheet material to the female mold.
5. An efficient and economical process for forming plastic parts from sheet material as claimed in claim 1 wherein said die in step 1) is adapted to adjust the wall thickness profile of the plastic sheet material extruded downwardly therefrom.
6. An efficient and economical process for forming sheet plastic parts as in claim 1 wherein in step 2) the female and male mold cavities are mated together with mating portions for extruding the plastic sheet to completely or nearly separate the plastic part from the waste part.
7. A process for forming a highly efficient and economical sheet material plastic part as claimed in claim 1 wherein after separation of the female and male molds, the female mold cavity is maintained at a negative pressure to shape the plastic part; and applying positive pressure to the female die cavity to separate the plastic part from the female die cavity and take the plastic part.
8. An efficient and economical process for forming sheet plastic parts as claimed in claim 1 wherein said plastic parts are formed by a plurality of female molds engaging said plastic sheet material at different times with two male molds.
9. A process for forming plastic parts from sheet material in accordance with claim 1, wherein the plastic sheet material extruded downwardly from the die is a single layer or a multi-layer structure of different materials.
10. An efficient and economical process for forming sheet plastic parts as claimed in claim 1 wherein said sheet plastic parts are formed from softened plastic sheet material alone or in combination with pre-placed female and male members.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010174636.3A CN111251622A (en) | 2020-03-13 | 2020-03-13 | Efficient and economical sheet plastic part forming process method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010174636.3A CN111251622A (en) | 2020-03-13 | 2020-03-13 | Efficient and economical sheet plastic part forming process method |
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| CN111251622A true CN111251622A (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010174636.3A Pending CN111251622A (en) | 2020-03-13 | 2020-03-13 | Efficient and economical sheet plastic part forming process method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116945352A (en) * | 2023-08-15 | 2023-10-27 | 安徽华奇管业有限公司 | Extrusion device for lining mould of spliced cement pipe |
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Cited By (2)
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| CN116945352A (en) * | 2023-08-15 | 2023-10-27 | 安徽华奇管业有限公司 | Extrusion device for lining mould of spliced cement pipe |
| CN116945352B (en) * | 2023-08-15 | 2024-08-02 | 安徽华奇管业有限公司 | Extrusion device for lining mould of spliced cement pipe |
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Application publication date: 20200609 |