JPH09254256A - Mold for molding embossed sheet - Google Patents

Mold for molding embossed sheet

Info

Publication number
JPH09254256A
JPH09254256A JP6652896A JP6652896A JPH09254256A JP H09254256 A JPH09254256 A JP H09254256A JP 6652896 A JP6652896 A JP 6652896A JP 6652896 A JP6652896 A JP 6652896A JP H09254256 A JPH09254256 A JP H09254256A
Authority
JP
Japan
Prior art keywords
sheet
mold
embossed
embossed sheet
expansion
Prior art date
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.)
Pending
Application number
JP6652896A
Other languages
Japanese (ja)
Inventor
Masaru Kurosawa
優 黒沢
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujikura Ltd
Original Assignee
Fujikura Ltd
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 Fujikura Ltd filed Critical Fujikura Ltd
Priority to JP6652896A priority Critical patent/JPH09254256A/en
Publication of JPH09254256A publication Critical patent/JPH09254256A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00Manufacturing
    • H01H2229/05Forming; Half-punching

Landscapes

  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Manufacture Of Switches (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of wrinkles and break even when a deep- draw embossed sheet is molded. SOLUTION: An expansion and contraction means 1 comprising, for example, an elastic sheet or a spring member is provided between recessed and projected holding molds 101, 102 and a flexible sheet 104 is interposed between the molds and pressed by pressing force to be deformed but pressing force is dispersed in the peripheries A, B of the deformed part by the expansion and contraction means and the concn. of stress is not generated. Therefore, wrinkles or break are not generated in the peripheries of the deformed part and deep-draw emboss processing can be performed.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、エンボスシート成
形用金型に関し、特に電子機器のキーボードスイッチ等
に好適なメンブレンスイッチを構成するエンボスシート
の成形用金型に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for molding an embossed sheet, and more particularly to a mold for molding an embossed sheet which constitutes a membrane switch suitable for a keyboard switch of electronic equipment.

【0002】[0002]

【従来の技術】電子機器等に使用される薄型のスイッチ
入力装置の一種としてメンブレンスイッチが知られてい
る。該メンブレンスイッチの構造の一例として、電極が
形成されたプリント基板と、エンボス加工(凸加工)部
の内面に電極が形成された可撓性シートとを絶縁層から
なるスペーサを介して対向配置され、前記エンボス部が
外部から押下されて両電極が接触される際にクリック感
触を得ることができるようにしたタイプのものがある。
2. Description of the Related Art A membrane switch is known as a type of thin switch input device used in electronic devices and the like. As an example of the structure of the membrane switch, a printed circuit board having electrodes formed thereon and a flexible sheet having electrodes formed on the inner surface of an embossed (convex processed) portion are arranged to face each other via a spacer made of an insulating layer. There is a type in which a click feeling can be obtained when the both electrodes are brought into contact with each other by pressing the embossed portion from the outside.

【0003】図4は、従来の可撓性シートにエンボスを
形成する場合の模式図である。図4に示すように、挟み
込み型の成形用金型の下型101と上型102とが対向
配置され、エンボス凸部以外の平面性を良好にするため
のクッションシート103とポリエチレンテレフタレー
ト樹脂製の可撓性シート(以下、PETシートと記す)
104とが配置されている。前記下型101の中央部上
面にはエンボスを形成するための突起部101aが形成
され、該突起部101aに対応した上型101の中央部
には突起部101aが嵌入される孔102aが形成され
ている。
FIG. 4 is a schematic view in the case of forming an emboss on a conventional flexible sheet. As shown in FIG. 4, a lower mold 101 and an upper mold 102 of a sandwiching mold are arranged so as to face each other, and a cushion sheet 103 for improving flatness other than an embossed convex portion and a polyethylene terephthalate resin Flexible sheet (hereinafter referred to as PET sheet)
And 104 are arranged. A protrusion 101a for forming an emboss is formed on the upper surface of the center of the lower mold 101, and a hole 102a into which the protrusion 101a is fitted is formed in the center of the upper mold 101 corresponding to the protrusion 101a. ing.

【0004】そして、PETシート104をプレス成形
してエンボスシートを成形する場合には、例えば、上下
金型101,102を温度100℃に設定されたホット
プレス機にかけて2分間加圧し、PETシート104を
変形させる。次いで、上下金型101,102を30℃
に設定されたコールドプレス機に移して2分間加圧す
る。その後、上下金型101,102からPETシート
104を取り外しても、PETシートの凸部(エンボ
ス)の形状はそのまま維持されて、エンボスシートが完
成する。
When the PET sheet 104 is press-molded to form an embossed sheet, for example, the upper and lower molds 101 and 102 are pressed for 2 minutes in a hot press machine set at a temperature of 100 ° C. to form the PET sheet 104. Transform. Next, the upper and lower molds 101 and 102 are heated to 30 ° C.
It is transferred to a cold press machine set to 1 and pressurized for 2 minutes. After that, even if the PET sheet 104 is removed from the upper and lower molds 101 and 102, the shape of the convex portion (emboss) of the PET sheet is maintained as it is, and the embossed sheet is completed.

【0005】[0005]

【発明が解決しようとする課題】しかしながら、従来の
手段(図4参照)を用いてエンボスシートを成形する場
合に、エンボスの絞り量が小さければ特に問題無くエン
ボス加工を行えるが、絞り量が1mm以上の深絞りの成
形を行う場合(例えば、実装された電気部品の保護用エ
ンボスシート)になると、従来の手段では、エンボスシ
ートのエンボス部周辺にシワが発生したり、破断したり
することがある。そこで、本発明の目的は、深絞りのエ
ンボスシートを成形する場合にもシワが発生したり、破
断を起すことのないエンボスシート成形用金型を提供す
ることである。
However, when the embossed sheet is formed by using the conventional means (see FIG. 4), the embossing can be performed without any particular problem if the embossing drawing amount is small, but the drawing amount is 1 mm. When performing deep drawing as described above (for example, an embossed sheet for protecting mounted electrical components), conventional means may cause wrinkles or breaks around the embossed portion of the embossed sheet. is there. Therefore, an object of the present invention is to provide an embossed sheet molding die that does not cause wrinkles or break even when forming a deep-drawn embossed sheet.

【0006】[0006]

【課題を解決するための手段】上記課題を解決するため
に請求項1記載の発明は、合成樹脂製のシートにエンボ
ス加工を行う凹凸型の挟み込み成形型を備えたエンボス
シート成形用金型において、前記凹凸型の挟み込み成形
型の間に伸縮手段およびプレス時の急激な絞り加工を緩
和する応力緩和手段を備えたことを特徴とする。また、
請求項2記載の発明は、前記伸縮手段は弾性シートであ
ることを特徴とする。
In order to solve the above-mentioned problems, the present invention according to claim 1 provides an embossed sheet molding die having a concavo-convex sandwiching die for embossing a synthetic resin sheet. An expanding / contracting means and a stress relieving means for relieving rapid drawing during pressing are provided between the concavo-convex sandwiching molds. Also,
The invention according to claim 2 is characterized in that the elastic means is an elastic sheet.

【0007】また、請求項3記載の発明は、前記伸縮手
段はバネ部材であることを特徴とする。請求項1乃至請
求項3記載の発明によれば、凹凸型の挟み込み成形型の
間には、例えば弾性シート,バネ部材等からなる伸縮手
段が備えられている。そして、成形型間に可撓性シート
を介在させ、押圧力を加えると可撓性シートは変形され
るが、その変形における変形部の周辺は伸縮手段および
応力緩和手段により押圧力が分散され、応力集中が発生
しない。従って、該変形部の周辺ではシワを発生した
り、破断を起すことがなく、深絞りのエンボス加工を行
うことができる。
The invention according to claim 3 is characterized in that the expanding and contracting means is a spring member. According to the first to third aspects of the invention, the expansion and contraction means including, for example, an elastic sheet and a spring member is provided between the concavo-convex sandwiching molds. Then, the flexible sheet is interposed between the molding dies, and when a pressing force is applied, the flexible sheet is deformed, but the pressing force is dispersed by the expanding and contracting means and the stress relaxation means around the deformed portion in the deformation, Stress concentration does not occur. Therefore, deep drawing embossing can be performed without causing wrinkles or breaking around the deformed portion.

【0008】[0008]

【発明の実施の形態】以下、本発明を図示の実施形態例
に基づいて説明する。なお、既に説明した部分には同一
符号を付し、重複記載を省略する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. Note that the same reference numerals are given to the already described portions, and redundant description is omitted.

【0009】(1)第1実施形態例 図1(A),(B),(C)は、本実施形態例の断面図
および本実施形態例の金型を使用してPETシートを成
形する工程を示す図である。図1(A)に示すように、
凹凸型の挟み込み成形型をなす下型101には、それぞ
れ中央部に貫通孔が形成された弾力性に富むクッション
ゴム1と金属プレート2とが装着されている。前記クッ
ションゴム1の材質としては、シリコン系,塩化ビニル
系等が好適であり、金属プレート2の材質としてはアル
ミニュウム系材料等が好適である。
(1) First Embodiment Example FIGS. 1 (A), (B), and (C) are sectional views of this embodiment example and a PET sheet is molded using the mold of this embodiment example. It is a figure which shows a process. As shown in FIG.
A cushion rubber 1 having a through hole formed in the central portion and having a high elasticity, and a metal plate 2 are mounted on a lower mold 101 forming a concavo-convex sandwiching mold. The cushion rubber 1 is preferably made of silicon, vinyl chloride or the like, and the metal plate 2 is preferably made of aluminum or the like.

【0010】次に動作を説明する。先ず、図1(A)に
示すように、温度が約100℃に設定された上下金型1
01,102の下型101にクッションゴム1と金属プ
レート2とを装着し、更にPETシート104を所定位
置に介在され、図示しないホットプレス機を作動する。
すると、図1(B)に示すように、上型102が下降
し、下型101の突起部101aが上型102の孔10
2aに挿入した状態で、PETシート104を2分間加
圧する。
Next, the operation will be described. First, as shown in FIG. 1 (A), the upper and lower molds 1 whose temperature is set to about 100 ° C.
The cushion rubber 1 and the metal plate 2 are attached to the lower molds 01 and 102, and the PET sheet 104 is interposed at a predetermined position, and a hot press machine (not shown) is operated.
Then, as shown in FIG. 1B, the upper mold 102 is lowered, and the protrusion 101 a of the lower mold 101 is changed to the hole 10 of the upper mold 102.
The PET sheet 104 is pressed for 2 minutes while being inserted into 2a.

【0011】次いで、PETシート104を挟持した状
態で上下金型101,102を30℃に設定されたコー
ルドプレス機に移して2分間加圧する。その後、上下金
型101,102からPETシート104を取り外す
と、図1(C)に示すように、エンボスの形状がそのま
ま維持されるエンボスシート3が完成する。
Next, the upper and lower molds 101 and 102 with the PET sheet 104 held therebetween are transferred to a cold press machine set at 30 ° C. and pressed for 2 minutes. After that, when the PET sheet 104 is removed from the upper and lower molds 101 and 102, as shown in FIG. 1C, the embossed sheet 3 in which the embossed shape is maintained as it is is completed.

【0012】そして、図1(B)に示す加圧の際には、
プレス力(押圧力)によりクッションゴム1が収縮され
るので、図1(C)に符号A,Bで示すような凸部周辺
部においては応力が分散され、応力集中を起すことがな
い。従って、凸部周辺にクラック(破断)やシワが発生
することがない。但し、加工時間は、プレス時の設定温
度によって変化する。
Then, at the time of pressurization shown in FIG. 1 (B),
Since the cushion rubber 1 is contracted by the pressing force (pressing force), the stress is dispersed in the peripheral portion of the convex portion as indicated by reference characters A and B in FIG. 1C, and stress concentration does not occur. Therefore, cracks (breaks) and wrinkles do not occur around the protrusions. However, the processing time changes depending on the set temperature during pressing.

【0013】(2)第2実施形態例 図2は本実施形態例の要部側面図である。図2に示すよ
うに、下型101と金属プレート2との間には複数本の
コイルバネ5が配設されている。このように構成しても
第1実施形態例と同様に加圧時にエンボスシートの凸部
周辺部に応力が集中することがないので、凸部周辺にク
ラックやシワが発生することがない。
(2) Second Embodiment Example FIG. 2 is a side view of the essential portions of this embodiment example. As shown in FIG. 2, a plurality of coil springs 5 are arranged between the lower die 101 and the metal plate 2. Even with such a configuration, as in the first embodiment, stress is not concentrated on the peripheral portion of the convex portion of the embossed sheet during pressurization, so that cracks and wrinkles do not occur around the convex portion.

【0014】(3)第3実施形態例 図3は本実施形態例の要部側面図である。図3に示すよ
うに、下型101と金属プレート2との間には棒材をX
字状に組み図示しない付勢手段により上方に付勢されて
いる伸縮機構6が配設されている。このように構成して
も第1実施形態例と同様に加圧時にエンボスシートの凸
部周辺部に応力が集中することがないので、凸部周辺に
クラックやシワが発生することがない。
(3) Third Embodiment Example FIG. 3 is a side view of the essential portions of this embodiment example. As shown in FIG. 3, a bar member is placed between the lower die 101 and the metal plate 2 in an X shape.
An expansion / contraction mechanism 6 is provided which is assembled in a letter shape and is urged upward by urging means (not shown). Even with such a configuration, as in the first embodiment, stress is not concentrated on the peripheral portion of the convex portion of the embossed sheet during pressurization, so that cracks and wrinkles do not occur around the convex portion.

【0015】[0015]

【発明の効果】以上説明したように本発明によれば、合
成樹脂製のシートにエンボス加工を行う凹凸型の挟み込
み成形型を備えたエンボスシート成形用金型において、
前記凹凸型の挟み込み成形型の間に伸縮手段を備えたの
で、成形型間に可撓性シートを介在させ、押圧力を加え
ると可撓性シートは変形されるが、その変形における変
形部の周辺は伸縮手段により押圧力が分散され、応力集
中が発生しない。従って、該変形部の周辺ではシワを発
生したり、破断を起すことがなく、深絞りの成形品への
エンボス加工が可能になる。
As described above, according to the present invention, in an embossed sheet molding die provided with a concavo-convex sandwiching die for embossing a synthetic resin sheet,
Since the expansion and contraction means is provided between the concavo-convex sandwiching molds, the flexible sheet is deformed when a flexible sheet is interposed between the molds and a pressing force is applied. The pressing force is dispersed around the periphery by the expansion / contraction means, and stress concentration does not occur. Therefore, it is possible to emboss a deep-drawn molded product without causing wrinkles or breaking around the deformed portion.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の第1実施形態例を示す図であって、
(A)は押圧以前の側断面図、(B)は押圧時の側断面
図、(C)は完成したエンボスシートの側断面図であ
る。
FIG. 1 is a diagram showing a first embodiment example of the present invention,
(A) is a side sectional view before pressing, (B) is a side sectional view at the time of pressing, and (C) is a side sectional view of a completed embossed sheet.

【図2】同第2実施形態例の側断面図である。FIG. 2 is a side sectional view of the second embodiment example.

【図3】同第3実施形態例の側断面図である。FIG. 3 is a side sectional view of the third embodiment example.

【図4】従来のエンボスシート成形用金型の側断面図で
ある。
FIG. 4 is a side sectional view of a conventional embossed sheet molding die.

【符号の説明】[Explanation of symbols]

1 クッションゴム 2 金属プレート 3 エンボスシート 5 コイルバネ 6 伸縮機構 101 下型 102 上型 104 PETシート(可撓性シート) 1 Cushion Rubber 2 Metal Plate 3 Embossed Sheet 5 Coil Spring 6 Expansion Mechanism 101 Lower Mold 102 Upper Mold 104 PET Sheet (Flexible Sheet)

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 合成樹脂製のシートにエンボス加工を行
う凹凸型の挟み込み成形型を備えたエンボスシート成形
用金型において、 前記凹凸型の挟み込み成形型の間に伸縮手段を備えたこ
とを特徴とするエンボスシート成形用金型。
1. An embossed sheet molding die including a concavo-convex sandwiching mold for embossing a synthetic resin sheet, characterized in that expansion and contraction means are provided between the concavo-convex sandwiching mold. Mold for forming embossed sheet.
【請求項2】 前記伸縮手段は、弾性シートであること
を特徴とする請求項1記載のエンボスシート成形用金
型。
2. The embossed sheet molding die according to claim 1, wherein the expansion / contraction means is an elastic sheet.
【請求項3】 前記伸縮手段は、バネ部材であることを
特徴とする請求項1記載のエンボスシート成形用金型。
3. The mold for molding an embossed sheet according to claim 1, wherein the expansion / contraction means is a spring member.
JP6652896A 1996-03-22 1996-03-22 Mold for molding embossed sheet Pending JPH09254256A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6652896A JPH09254256A (en) 1996-03-22 1996-03-22 Mold for molding embossed sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6652896A JPH09254256A (en) 1996-03-22 1996-03-22 Mold for molding embossed sheet

Publications (1)

Publication Number Publication Date
JPH09254256A true JPH09254256A (en) 1997-09-30

Family

ID=13318474

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6652896A Pending JPH09254256A (en) 1996-03-22 1996-03-22 Mold for molding embossed sheet

Country Status (1)

Country Link
JP (1) JPH09254256A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007230241A (en) * 2002-06-18 2007-09-13 Meiki Co Ltd Press-forming method
JP2010179488A (en) * 2009-02-03 2010-08-19 Fuji Electric Device Technology Co Ltd Imprint apparatus and imprint method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007230241A (en) * 2002-06-18 2007-09-13 Meiki Co Ltd Press-forming method
JP4679546B2 (en) * 2002-06-18 2011-04-27 株式会社名機製作所 Press forming method
JP2010179488A (en) * 2009-02-03 2010-08-19 Fuji Electric Device Technology Co Ltd Imprint apparatus and imprint method

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