WO2021251502A1 - Dispositif de thermoformage et procédé de thermoformage - Google Patents

Dispositif de thermoformage et procédé de thermoformage Download PDF

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Publication number
WO2021251502A1
WO2021251502A1 PCT/JP2021/022473 JP2021022473W WO2021251502A1 WO 2021251502 A1 WO2021251502 A1 WO 2021251502A1 JP 2021022473 W JP2021022473 W JP 2021022473W WO 2021251502 A1 WO2021251502 A1 WO 2021251502A1
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WO
WIPO (PCT)
Prior art keywords
mold
molding
sheet
lower mold
upper mold
Prior art date
Application number
PCT/JP2021/022473
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English (en)
Japanese (ja)
Inventor
憲一 溝口
章伍 高井
一典 寺本
Original Assignee
株式会社浅野研究所
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 株式会社浅野研究所 filed Critical 株式会社浅野研究所
Priority to CN202180022136.0A priority Critical patent/CN115298013A/zh
Publication of WO2021251502A1 publication Critical patent/WO2021251502A1/fr

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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
    • B29C51/08—Deep drawing or matched-mould forming, i.e. using mechanical means only
    • 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
    • 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
    • B29C51/38—Opening, closing or clamping means

Definitions

  • the present invention relates to a technique capable of molding a resin molded sheet using a thermoforming apparatus without leaving a strain generated during molding of the resin molded sheet at a specific portion of the molded product.
  • thermoforming device When molding a resin sheet using a thermoforming device, there is a method of pressurizing using an upper mold and a lower mold as molding dies to deform and mold the heated resin sheet. Molding is performed by sandwiching a resin sheet softened by heating between an upper mold and a lower mold and pressurizing it. For example, it is a method as shown in Patent Document 1.
  • Patent Document 1 discloses a technique relating to a mold clamping device and a mold clamping method.
  • the sheet sandwiched between the upper edge of the frame and the lower edge of the frame is heated and softened, and the plug corresponding to the upper mold is brought close to the female mold corresponding to the lower mold, and the resin molded sheet held between them. It is configured to mold. At this time, the resin molded sheet is held so as not to move by pressing the resin molded sheet against the lower table side by the gripping member provided on the upper table side.
  • a molded product is used as a cover for a car navigation system attached to an automobile, and this cover has a transparent part used as an operation window. Even if the distortion of the molded product cannot be visually confirmed, directional distortion may be formed inside the molded product, and when you look at the car navigation screen through a lens that uses polarized glasses such as sunglasses, it is one of the displays. The applicant has confirmed that there are cases where the part appears to be missing. Further, when an LED backlight or the like is used for the display screen, interference fringes may appear due to the influence of internal distortion. Since there are cases where the distortion remaining inside the molded product becomes a problem in this way, countermeasures are required.
  • an object of the present invention is to solve such a problem and to provide a thermoforming apparatus and a thermoforming method capable of forming so that internal strain does not remain in a specific portion.
  • thermoforming apparatus according to one aspect of the present invention has the following features.
  • thermoforming apparatus having an upper mold and a lower mold as a molding mold and sandwiching a heated resin sheet between the upper mold and the lower mold, either the upper mold or the lower mold is used. It has a pressing means provided so as to protrude from the molding surface on one side, and the pressing means forms a specific portion of the resin sheet that becomes a part of the product after molding on the other side of the molding mold. It has a function of sandwiching with a surface, and is characterized in that a portion other than the specific portion of the resin sheet is sandwiched between the upper mold and the lower mold to form the resin sheet.
  • the specific portion is a transparent portion when the resin sheet becomes a product.
  • thermoforming apparatus includes a drive mechanism for raising and lowering at least one of the upper mold and the lower mold, and a control device for controlling the drive mechanism. With the lower mold closed, position control or torque control is performed by a control device that controls the drive mechanism to control the position of the lower mold with respect to the upper mold.
  • the position of the lower mold with respect to the upper mold can be controlled by the drive mechanism according to the embodiment described in (3) above, the clearance of the lower mold with respect to the upper mold when the mold is closed is controlled, and the molding condition of the molded product is adjusted. can do.
  • the raising and lowering of the upper die or the lower die by the drive mechanism has a function of fixing one of the upper die or the lower die and bringing the other close to each other, or both close to each other. This makes it possible to control the clearance of the lower mold with respect to the upper mold, for example, according to the material and thickness of the resin sheet. By doing so, it is possible to adjust the finished product of the molded product, and thus it is possible to improve the molding accuracy.
  • thermoforming apparatus In the thermoforming apparatus according to (1), the specific portion is characterized in that an air pool is likely to occur during molding.
  • thermoforming method according to another aspect of the present invention has the following features.
  • thermoforming method in which an upper mold and a lower mold are provided as a molding mold and a heated resin sheet is sandwiched between the upper mold and the lower mold, either the upper mold or the lower mold is used.
  • a specific portion of the resin sheet that is a part of the molded product after molding is sandwiched between the pressing means provided so as to protrude from the molding surface on one side and the molding surface of the molding mold on the other side. It is characterized in that the resin sheet is formed by sandwiching a portion other than the specific portion of the resin sheet between the upper mold and the lower mold.
  • the molded product after molding can suppress the occurrence of internal strain in a specific portion pressed by the pressing means. can. Therefore, as in the embodiment of the thermoforming apparatus described in (2), when the specific portion is a transparent portion, internal distortion, interference fringes, etc. in the specific portion pressed by the pressing means may occur. It can be prevented from occurring. Therefore, it is possible to make a product in which the transparent portion remains transparent.
  • thermoforming apparatus of this embodiment It is a side view which shows the whole outline of the thermoforming apparatus of this embodiment. It is a side view of the molding part of this embodiment. It is a perspective view explaining the drive system of the lower table of this embodiment. It is a perspective view explaining the drive system of the upper table of this embodiment. It is a side sectional view of the present embodiment in a state where the upper mold and the lower mold are close to each other. It is a schematic block diagram of the control about the molded part of this embodiment. It is a schematic diagram which shows the state that the resin molded sheet is sandwiched between the sheet pressing part and the lower mold of this embodiment. It is a schematic diagram which shows the state that the upper mold and the lower mold are brought close to each other while being pressed by the sheet pressing portion of this embodiment.
  • FIG. 1 is a schematic side view briefly illustrating the entire thermoforming apparatus 10 of the present embodiment.
  • the thermoforming apparatus 10 includes a sheet heating unit 20 and a molding unit 30.
  • the sheet heating unit 20 is a place for heating the resin molded sheet S.
  • the resin molded sheet S cut in advance for one shot is clamped by the transfer device 50 by a clamping function (not shown) and moved to the sheet heating unit 20.
  • the resin molded sheet S is heated and softened.
  • the resin molding sheet S is conveyed to the molding unit 30 to perform molding.
  • the sheet heating unit 20 is provided with an upper heater unit 21 and a lower heater unit 22 as a pair of heater units.
  • the heating elements arranged in the upper heater unit 21 and the lower heater unit 22 are energized.
  • the heating temperature is appropriately set by the material of the resin molded sheet S.
  • the molding unit 30 is provided with an upper table 31 and a lower table 32 that are moved up and down.
  • the upper table 31 and the lower table 32 are configured to move up and down by ball screws (second ball screw 34 and first ball screw 35) described later, and the upper mold 37 and the lower table provided inside the upper table 31.
  • ball screws second ball screw 34 and first ball screw 35
  • FIG. 2 shows a side view of the molded portion 30.
  • the molding portion 30 is provided with a frame 36, and the upper table 31 and the lower table 32 are moved up and down in the frame 36.
  • a guide rail 36a which is long in the vertical direction and has a length corresponding to the elevating stroke of the lower table 32 is provided.
  • FIG. 3 shows a perspective view of the drive system of the lower table 32.
  • the lower table 32 is provided with fitting portions 32a at its four corners.
  • the fitting portion 32a has a function of guiding the raising and lowering of the lower table 32 by fitting with the guide rail 36a shown in FIG.
  • the second ball screw 34 is arranged diagonally to the lower table 32.
  • the second ball screw 34 is rotatably fixed to the frame 36 and is arranged so as to penetrate the lower table 32.
  • a nut 34b is fixed to the lower table 32 at a position where the second ball screw 34 penetrates, and the nut 34b and the second ball screw 34 mesh with each other.
  • a second pulley 34a is attached to the upper end of the second ball screw 34, and the rotational driving force of the second servomotor 61 is transmitted to each of the second pulleys 34a via the second timing belt 34c. Therefore, the lower table 32 is configured to move up and down by the rotational drive of the second servomotor 61.
  • a lower die 33 is fixed to the center of the lower table 32, and the lower die 33 also moves up and down as the lower table 32 moves up and down.
  • FIG. 4 shows a perspective view of the drive system of the upper table 31 extracted.
  • Gripping members 31a are provided at the four corners of the upper table 31.
  • the gripping member 31a engages with the guide rail 36b provided on the frame 36 shown in FIG. 2 and slides to guide the raising and lowering of the upper table 31.
  • the vertical driving force of the upper table 31 is obtained by the first servomotor 60, and the rotational force of the first servomotor 60 is transmitted to the first ball screw 35 by the first timing belt 35c as shown in FIG.
  • the upper table 31 is raised and lowered.
  • a first pulley 35a is fixed to the end of the first ball screw 35.
  • An upper die 37 is fixed to the lower surface of the upper table 31.
  • FIG. 5 shows a side sectional view of the upper die 37 and the lower die 33 in close proximity to each other.
  • the upper die 37 and the lower die 33 in the figure are closer to each other than the retreat positions of the upper die 37 and the lower die 33.
  • the lower mold 33 is configured to abut against the upper mold 37 with the resin molded sheet S sandwiched between them, and the upper mold 37 is provided with a sheet pressing portion 37a.
  • the seat pressing portion 37a is engaged with the upper mold 37 via a spring 37b, and is guided by a shaft (not shown) arranged in the center of the spring 37b, so that the upper mold is as shown in FIG. 7D described later.
  • the sheet pressing portion 37a is housed in the recess 37c provided in the upper mold 37.
  • FIG. 6 shows a schematic configuration of control regarding the molded portion 30.
  • a servomotor control unit 91, an input unit 94, and an output unit 95 are connected to the programmable logic controller (hereinafter referred to as PLC) 90.
  • the first servomotor 60 and the second servomotor 61 are connected to the servomotor control unit 91, respectively.
  • a first encoder 70 is connected to the first servomotor 60
  • a second encoder 71 is connected to the second servomotor 61
  • the first encoder 70 and the second encoder 71 are connected to the PLC 90, respectively.
  • the output unit 95 includes a display or the like provided on an operation panel (not shown), and displays a status such as an error.
  • the input unit 94 includes buttons provided on an operation panel (not shown), and can input various data and the like.
  • the operation panel is a touch panel system and does not prevent the input unit 94 and the output unit 95 from being combined. Further, the input unit 94 may be provided with a button for operation separately.
  • the servomotor control unit 91 drives and controls the first servomotor 60 and the second servomotor 61.
  • a device provided in the molding unit 30 is connected to the PLC 90, the description thereof is omitted because it is not directly related to the present invention.
  • FIG. 7A to 7D schematically show how the resin molded sheet S is molded by the upper mold 37 and the lower mold 33.
  • the resin molded sheet S is pressed against the lower mold 33 by the sheet pressing portion 37a provided on the upper mold 37.
  • the sheet pressing portion 37a is urged by a spring 37b, and the resin molded sheet S is fixed so as not to move due to the pressing force.
  • one end of the resin molded sheet S is clamped by the transport device 50.
  • the resin molded sheet S is deformed by advancing the upper mold 37 with respect to the lower mold 33.
  • the upper mold 37 and the lower mold 33 are advanced to a position where they are in close contact with each other via the resin molded sheet S, thereby pressurizing and deforming the resin molded sheet S. In this way, the resin molded sheet S is molded into the molded product M by the upper mold 37 and the lower mold 33.
  • thermoforming apparatus 10 of the present embodiment Since the thermoforming apparatus 10 of the present embodiment has the above configuration, it exhibits the following actions and effects.
  • thermoforming apparatus 10 provided with an upper mold 37 and a lower mold 33 as a molding mold and sandwiching a heated resin molding sheet S between the upper mold 37 and the lower mold 33, in which the upper mold 37 or the lower mold 33 is formed.
  • a sheet pressing portion 37a which is a pressing means provided so as to protrude from the molded surface on either one of the two, is provided, and the sheet pressing portion 37a becomes a part of the molded product M after molding in the resin molded sheet S.
  • a specific portion (transparent portion M1 described later) is pressed so as to be sandwiched between the molding surface of the molding die on the other side (in the present embodiment, the lower surface of the sheet pressing portion 37a provided on the upper die 37 and the upper surface of the lower die 33 are pressed. (Holding so as to be sandwiched), the resin molded sheet S is formed by sandwiching the resin molded sheet S with the upper mold 37 and the lower mold 33 except for a specific portion.
  • FIGS. 8A to 8D are diagrams schematically showing how the resin molded sheet S is molded by the upper mold 137 and the lower mold 133 prepared for comparison.
  • the resin molding sheet S is molded by the upper mold 137 and the lower mold 133.
  • the upper mold 137 and the lower mold 133 play the same role as the upper mold 37 and the lower mold 33 of the present embodiment. The same applies to the point that one end is clamped by the moving device 150.
  • the resin molded sheet S is molded by bringing the upper mold 137 and the lower mold 133 close to each other as in the present embodiment. However, as shown in FIG. 8B, the resin molded sheet S abuts on the upper die 137 at the point P1 and abuts on the lower die 133 at the point P3 to form a point P2 floating from the lower die 133.
  • FIG. 9 schematically shows a perspective view when molding a resin molded sheet using an upper mold and a lower mold.
  • the molded product M is provided with a transparent portion M1.
  • a display screen is arranged behind the molded product M, so that the transparent portion M1 is provided. It becomes the window part.
  • the transparent portion M1 is first pressed against the lower mold 33 by the sheet pressing portion 37a, and the upper mold 37 is brought close to the lower mold 33 while being held (actually, the upper mold 37).
  • the mold 37 is lowered by driving the first servomotor 60, and the lower mold 33 is raised by driving the second servomotor 61, so that the mold 37 is controlled to be close to each other).
  • the upper mold 37 and the lower mold 33 are brought into close contact with each other via the resin molding sheet S to form the molded product M.
  • the transparent portion M1 can be firmly held by applying pressure to the upper surface of the lower mold 33 at the sheet pressing portion 37a first, and FIGS. 7B and 7C And when the resin molded sheet S is deformed, the transparent portion M1 does not move. Therefore, the floating as shown at the point P2 as shown in FIGS. 8B and 8C cannot be performed. Therefore, the meat is molded without being pulled or wrinkled from the transparent portion M1, and when the state shown in FIG. 7D is reached, the transparent portion M1 is molded in a state where internal strain is not accumulated. It will be possible.
  • the internal strain is formed in a directional manner, so that it may exhibit polarization with respect to transmitted light.
  • sunglasses using a polarized lens when sunglasses using a polarized lens are used, it is transparent. A part of the display screen that can be seen through the portion M1 may appear as a defect.
  • such a problem can be solved by molding with the upper mold 37 and the lower mold 33 in a state where the transparent portion M1 is pressed by the sheet pressing portion 37a.
  • the resin molded sheet S is molded in a state of being pressed by the sheet pressing portion 37a, even if the shape is such that air accumulation is likely to occur in this portion, the resin molded sheet S is pressed by the sheet pressing portion 37a. It is possible to prevent the formation of air pools. Therefore, it is possible to prevent the appearance from being deteriorated due to the generation of air pool.
  • the transparent portion M1 is used as a window when it is made into a product, it is possible to prevent an appearance defect due to the occurrence of air accumulation even if the structure is such that air accumulation is likely to occur in this portion.
  • thermoforming apparatus 10 performs position control or torque control, it is possible to control the clearance between the upper die 37 and the lower die 33 to an appropriate level.
  • This includes a first servomotor 60 corresponding to a first drive mechanism for raising the upper die 37, a second servomotor 61 corresponding to a second drive mechanism for lowering the lower die 33, a first servomotor 60, and a first servomotor 60.
  • Servo motor control unit 91 which is a control device for controlling the servo motor 61, and controls the first servo motor 60 and the second servo motor 61 with the upper die 37 and the lower die 33 closed. This is because the position control or torque control is performed by the 91 to control the position of the lower die 33 with respect to the upper die 37.
  • the first servomotor 60 and the second servomotor 61 are used to drive while performing feedback control, respectively.
  • the ball screw (first ball screw 35 and second ball screw 34) is rotated by the rotational drive of the servo motors (first servo motor 60 and second servo motor 61), and as a result, the upper table 31 and the lower table 32 are moved up and down. It is a structure that can be done.
  • the first servomotor 60 can execute position control using the position of the upper table 31 as a feedback element and torque control using the generated torque as a feedback element.
  • position control and torque control can be performed on the lower table 32 as well.
  • position control or torque control can be performed at the time of mold clamping, and the clearance between the upper mold 37 and the lower mold 33 can be controlled. It may be desirable to change the mold clamping pressure depending on the thickness of the resin molded sheet S, the properties of the material, the heating conditions of the upper mold 37 and the lower mold 33, and the like. Although the resin molded sheet S is in a state of being preheated by the heating unit 20 and softened in advance, there are cases where springback occurs after the molding process. In such a case, by performing position control or torque control on the upper mold 37 and the lower mold 33, it is possible to contribute to improving the molding accuracy of the molded product M.
  • the present invention is not limited to this, and various changes can be made without departing from the spirit of the present invention.
  • the seat pressing portion 37a is provided on the upper mold 37, but it may be better to provide the seat pressing portion 37a on the lower mold 33 depending on the place to be pressed, so that such a change is not hindered.
  • the spring 37b is provided between the upper die 37 and the seat pressing portion 37a to urge the resin molded sheet S.
  • an urging means using a cylinder or a motor may be used. It does not prevent the adoption of the used urging means.
  • the upper die 37 (or the lower die 33) and the sheet pressing portion 37a may be separated from each other.
  • the ball screw (first ball screw 35 and second ball screw 34) is driven by the rotational drive of the servomotor (first servomotor 60 and second servomotor 61).
  • the method is to be driven via a timing belt (first timing belt 35c and second timing belt 34c) which is a transmission means and a pulley or the like (first pulley 35a and second pulley 34a), but the method is limited to this.
  • a timing belt first timing belt 35c and second timing belt 34c
  • first pulley 35a and second pulley 34a which is a transmission means and a pulley or the like
  • it does not prevent the vehicle from being driven by using a gear or a cam as a power transmission means.
  • it does not prevent the cylinder and the crank mechanism from being used together for the mold clamping between the upper mold 37 and the lower mold 33.
  • thermoforming apparatus 10 for driving the upper table 31 and the lower table 32 has been described, it is fixed on one side as necessary, that is, either the upper table 31 or the lower table 32 is fixed and only the other is driven. It may be a method.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne un dispositif de thermoformage (10) comprenant un moule supérieur (37) et un moule inférieur (33) en tant que matrices de moulage et une feuille de moulage de résine (S) étant interposée entre le moule supérieur (37) et le moule inférieur (33) et moulée. Le dispositif de thermoformage (10) présente une section de pressage de feuille (37a) disposée de façon à faire saillie à partir de la surface de moulage du moule supérieur (37) ou du moule inférieur (33). La section de pressage de feuille (37a) possède une fonction qui, conjointement avec la surface de moulage de l'autre matrice de moulage, prend en sandwich une section transparente (M1) qui est une section de la feuille de moulage de résine (S) qui fait partie du produit moulé (M) après moulage. La feuille de moulage de résine (S) est moulée par le reste de la feuille de moulage de résine (S), autre que la section transparente (M1), étant prise en sandwich par le moule supérieur (37) et le moule inférieur (33).
PCT/JP2021/022473 2020-06-12 2021-06-14 Dispositif de thermoformage et procédé de thermoformage WO2021251502A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202180022136.0A CN115298013A (zh) 2020-06-12 2021-06-14 热成型装置及热成型方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020102085A JP6852933B1 (ja) 2020-06-12 2020-06-12 熱成形装置及び熱成形方法
JP2020-102085 2020-06-12

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Publication Number Publication Date
WO2021251502A1 true WO2021251502A1 (fr) 2021-12-16

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CN (1) CN115298013A (fr)
WO (1) WO2021251502A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03126619U (fr) * 1990-03-31 1991-12-20
JPH07186252A (ja) * 1993-12-25 1995-07-25 Meiwa Ind Co Ltd 加飾材付き積層成形体の製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03126619U (fr) * 1990-03-31 1991-12-20
JPH07186252A (ja) * 1993-12-25 1995-07-25 Meiwa Ind Co Ltd 加飾材付き積層成形体の製造方法

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JP6852933B1 (ja) 2021-03-31
JP2021194834A (ja) 2021-12-27
CN115298013A (zh) 2022-11-04

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