JP5016003B2 - Method for molding U-shaped plastic sheet suitable for use in thin display device - Google Patents

Description

  The present invention relates to a method of forming a U-shaped plastic sheet suitable for use in a thin display device, and more particularly to a method of forming a U-shaped plate material by compressing a kind of heating plate material with a mold.

  If the thickness of the U-shaped plate covering the thin display device is thin and has no light weight, it is impossible to reduce the weight of the thin display device. Thin display devices are particularly used in notebook computers, and the demands on weight of notebook computers are much stricter. Therefore, weight reduction design has always been pursued.

  The processing means for forming a plastic sheet according to the prior art into a U-shape is bending the plastic sheet by injection molding. However, the bending means by molding takes time from injection to shaping. Furthermore, the processing means for injection molding has a limit on the plate thickness of the member, and only plastic sheets with a certain thickness can be processed. If the thickness of the plastic sheet is extremely thin, the injection molding processing means can be used. Can not.

  The thickness of the U-shaped plate material used for the thin display device is about 1 mm or less. Since the thickness of this type of U-shaped plastic sheet is very thin, injection molding means cannot be used.

  In addition, means for bending a plastic sheet by a press machine has been devised. However, since the characteristics of the plastic plate material are fragile, stress concentration due to impact occurs at the bent portion of the plastic plate material pressed by the press machine, causing damage.

  This kind of plastic plate processed by a press machine may be damaged if it is impacted by an external force or dropped on the floor. The present inventor has devised this idea that there is a problem with injection molding and press processing according to the prior art, and the user cannot use it for molding a thin display device U-shaped plastic sheet, all the mechanical aspects of the prior art To solve the shortcomings.

  The technical problem to be solved by the present invention is to provide a method for forming a U-shaped sheet suitable for the use of a kind of thin display device against the drawbacks existing in the prior art.

  The second mold and the fixing member are gently moved to the first mold, the indenter molding part passes through the path and contacts the plate material, the molding part gently pushes the plate material, enters the molding groove, and the plate material is fixed. It is a main object of the present invention to provide means for pulling away from a member to enter a molding groove of a first mold and further bending a plate material.

  The plate is heated before it is bent to raise the temperature of the plate. Another object of the present invention is to provide means for heating the plate material to a temperature higher than the heat deformation temperature in order to facilitate the bending of the plate material.

  It is a further object of the present invention to provide means for separating the plate material from the first mold by providing blow piping in the first mold and sending air to the plate material.

The flowchart of the shaping | molding method of the U-shaped plastic sheet suitable for use of the thin-type display apparatus which concerns on this invention. The solid appearance figure of the board | plate material which concerns on this invention, a 1st metal mold | die, a 2nd metal mold | die, and a fixing member. Sectional drawing of the board | plate material which concerns on this invention, a 1st metal mold | die, a 2nd metal mold | die, and a fixing member. The aspect figure in which the board | plate material which concerns on this invention was installed in the fixing member. The mode figure which the 1st metal mold | die and 2nd metal mold | die which concern on this invention clamp. The aspect figure of U-shaped board | plate material shaping | molding by the 1st metal mold | die and 2nd metal mold | die which concern on this invention. The aspect figure which isolate | separated the 1st metal mold | die and 2nd metal mold | die which concern on this invention. The solid external view of the U-shaped board | plate material shape | molded by the means which concerns on this invention.

  Referring to FIG. 1, a flow chart of a method for forming a U-shaped plastic sheet suitable for use in a thin display device according to the present invention. The U-shaped plastic sheet according to the present invention refers to a plastic sheet having a thickness of 1 mm or less, and is suitable for a notebook personal computer, particularly suitable for a display device of a notebook personal computer. A method for forming a U-shaped plastic sheet suitable for use in the thin display device according to the present invention includes the following processes.

  A plate material, a first mold, a second mold, and a fixing member are prepared, and the fixing member is attached between the first mold and the second mold.

  The plate material is rolled into a plastic sheet of 1 mm or less, and after the plate material is rolled, it is cut into an appropriate dimension.

Attach the plate material to the fixed member,
Heating the plate,
By clamping the first mold and the second mold, the plate material is bent into a U-shape,
Cooling the plate,
Separate the first mold and the second mold,
The plate material is pulled away from the first mold.

  2 and 3, reference is made to the three-dimensional external view and cross-sectional view of the plate material, the fixing member, the first mold and the second mold according to the present invention. The plate 1 according to the present invention is bent by the first mold 10, the second mold 20 and the fixing member 30.

The first mold 10 includes a first surface 101 and a second surface 102, and two fixed columns 11 are provided on the first surface 101 of the first mold 10, and are fixed by the two fixed columns 11. Providing an effect. The first mold 10 is provided with at least one protrusion 12, a forming groove 13 is provided in the longitudinal direction of the protrusion 12, and the forming groove 13 is formed in an inverted U shape. At least one cooling pipe 14 is provided inside the first mold 10, and the cooling pipe 14 is provided with a cold source capable of reducing the temperature of the condensed mold or other first mold 10. At least one blower piping 15 is provided in the longitudinal direction of the first mold 10, and the blower piping 15 communicates with the forming groove 13 and feeds air into the forming groove 13.

At least one indenter 21 is provided in the second mold 20, and a molding part 22 is formed at the end of the indenter 21, and the molding part 22 forms an elongated shape. At least one temperature increasing piping 23 is provided inside the second mold 20, and a stand oil or other heat source capable of raising the temperature of the second mold 20 is provided in the temperature increasing piping 23. The second mold 20 is provided with a pedestal 24 on the opposite surface of the indenter 21, and a fixed column 25 is provided on the pedestal 24, and the fixed column 25 is arranged in order to form the second mold 20, the fixing member 30 and the first mold. The second mold 20, the fixing member 30, and the first mold 10 are limited to the same vertical position by the fixing column 25. An elastic member 26 is mounted on the second mold 20, and the elastic member 26 is limited between the pedestal 24 and the fixing member 30, and the elastic member 26 provides an elastic recovery force of the second mold 20.

The fixing member 30 is attached between the first mold 10 and the second mold 20, and the fixing member 30 includes a first surface 301 and a second surface 302. The fixing member 30 includes at least one receiving groove 31; At least one receiving hole 32 is provided, the receiving groove 31 is attached to the first surface 301, the receiving hole 32 is attached to the second surface 302, and a path 33 is provided between the receiving groove 31 and the receiving hole 32. The cross-sectional area is smaller than the receiving groove 31 and the receiving hole 32, the receiving groove 31 is provided in the plate material 1, the path 33, the forming groove 13 and the forming part 22 are attached at the same vertical position, and the indenter 21 is the receiving hole of the fixing member 30. The molded part 22 passes through the path 33 and enters the molding groove 13. At least one temperature increasing piping 34 is provided inside the fixing member 30, and a stand oil or other heat source capable of raising the temperature of the fixing member 30 is provided in the temperature increasing piping 34.

  Referring to FIG. 4, an aspect diagram in which the plate material according to the present invention is installed on the fixing member is referred to. The plate member 1 is a plastic flat plate, and the plate member 1 is attached to the receiving groove 31 of the fixing member 30 and the first surface 10 is fixed so as not to be moved. Move gently to the mold 10. At this time, the indenter 21 of the second mold 20 has not entered the receiving hole 32, and the molding portion 22 of the indenter 21 is in the path 33.

  Before the first mold 10 and the second mold 20 are clamped, the plate material 1 is heated, and the stand oil passes through the temperature-increasing pipings 23 and 34, and the temperature of the second mold 20 and the fixing member 30 is adjusted. By pulling up, the plate material 1 can be warmed, and after the plate material 1 is heated above the deformation temperature, it can be bent easily.

  5 and FIG. 6, reference is made to an aspect diagram in which the first mold and the second mold according to the present invention are clamped. The first mold 10 and the second mold 20 are clamped, and the first surface 301 of the fixing member 30 and the first mold 10 are bonded together, and the protrusion 12 of the first mold 10 is connected to the fixing member 30. The concave and convex portions are fitted into the receiving groove 31. On the other hand, the plate member 1 is attached between the protrusion 12 and the accommodation groove 31. Since the board | plate material 1 is heated indirectly at this time, it can be bent easily. The second mold 20 is moved slowly to the fixing member 30, and the fixing member 30 is moved toward the first mold 10 in conjunction with it. The molding part 22 of the indenter 21 passes through the path 33 and comes into contact with the plate material 1, and the molding part 22 gently pushes the plate material 1 into the molding groove 13, pulls the plate material 1 away from the fixing member 30, and After entering the forming groove 13, the plate material 1 is bent into a U-shape. On the other hand, the elastic member 26 bonds the first mold 10, the fixing member 30, and the second mold 20 by compressing the second mold 20.

  Before separating the first mold 10 and the second mold 20, it is necessary to cool the heat of the plate material 1. At this time, the condensed water is allowed to flow through the cooling pipe 14, the temperature of the first mold 10 is lowered, and the plate 1 is cooled to complete the shape.

  Reference is made to FIG. 7, which is a diagram illustrating the first mold and the second mold separated according to the present invention. The second mold 20 moves to the far end of the first mold 10, the second mold 20 interlocks with the fixing member 30, leaves the first mold 10, and forms the indenter 21 of the second mold 20. The part 22 is separated from the molding groove 13 of the first mold 10 to separate the first mold 10 and the second mold 20, and the U-shaped plate material 1 still remains in the molding groove 13. At this time, the ventilation piping 15 of the first mold 10 is opened to blow the plate material 1, and the plate material 1 is pulled away from the first mold 10.

  Reference is made to FIG. 8, a three-dimensional external view of a U-shaped plate material formed by the means according to the present invention. Since the molded U-shaped plate 1 is molded by gentle indentation by the molding means according to the product invention, there is no defect that occurs in the rapid impact of the prior art, it is possible to maintain a strong structural strength, and it is difficult to break or break .

DESCRIPTION OF SYMBOLS 1 Board | plate material 10 1st metal mold | die 1st surface 102 2nd surface 11 Fixed pillar 12 Protrusion part 13 Forming groove 14 Temperature-reducing piping 15 Air blow piping 20 2nd metal mold 21 Indenter 22 Molding part 23 Temperature-increasing piping 24 Base 25 Fixed pillar 26 elastic member 30 fixing member 301 first surface 302 second surface 31 receiving groove 32 receiving hole 33 path 34 temperature increasing piping

Claims (9)

A method for forming a U-shaped plastic sheet having a thickness of 1 mm or less including the following processes,
A plate material , a first mold provided with an inverted U-shaped forming groove, a second mold provided with a forming portion, and a fixing member are prepared, and the fixing member is provided with the first mold and the second mold. During installation,
Attaching the plate material to the fixing member,
By heating the second mold, the plate material is heated indirectly,
By clamping the first mold and the second mold, the molding portion pushes the plate material into the molding groove, and the plate material is bent to form a U-shape.
Cooling the plate,
Separate the first mold and the second mold,
The plate material is pulled away from the first mold. It provided increasing temperature piping to the second mold, a molding method of claim 1, wherein heating the second mold. The molding method according to claim 1 or 2 , wherein the plate member is indirectly heated by providing a temperature increasing piping on the fixing member and heating the fixing member. The plate material to facilitate in fold bending, molding method according to claim 1 or 2, wherein the heating or the heat distortion temperature   The molding method according to claim 1, wherein the plate material is indirectly cooled by cooling the first mold. 6. The molding method according to claim 5 , wherein a cooling pipe is provided on the first mold to cool the first mold.   The molding method according to claim 1, wherein the plate material is blown and the plate material is pulled away from the first mold. The blower piping provided in the first mold, molding method according to claim 7, wherein the blowing on the plate material. The second mold is provided with at least one indenter, a molding part is formed at the end of the indenter, the first mold is provided with at least one molding groove, the fixing member has at least one receiving groove, One receiving hole is provided, a path is provided between the receiving groove and the receiving hole, the plate member is attached to the receiving groove, and a molding portion of the indenter passes through the passage and contacts the plate member, 2. The molded part gently pushes the plate material into the molding groove, pulls the plate material away from the receiving groove, and enters the molding groove to fold the plate material into a U-shape. Molding method.

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