JPH0427925B2 - - Google Patents
Info
- Publication number
- JPH0427925B2 JPH0427925B2 JP59030035A JP3003584A JPH0427925B2 JP H0427925 B2 JPH0427925 B2 JP H0427925B2 JP 59030035 A JP59030035 A JP 59030035A JP 3003584 A JP3003584 A JP 3003584A JP H0427925 B2 JPH0427925 B2 JP H0427925B2
- Authority
- JP
- Japan
- Prior art keywords
- press
- wood fiber
- molding
- fiber board
- forming
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 9
- 229920002522 Wood fibre Polymers 0.000 claims description 8
- 239000002025 wood fiber Substances 0.000 claims description 8
- 238000004080 punching Methods 0.000 claims description 3
- 238000007598 dipping method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N5/00—Manufacture of non-flat articles
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Description
【発明の詳細な説明】
≪発明の分野≫
この発明は、木質繊維ボードのプレス成形方法
に関する。DETAILED DESCRIPTION OF THE INVENTION <<Field of the Invention>> This invention relates to a method for press forming wood fiber boards.
≪従来技術とその問題点≫
木質繊維ボードを用いたプレス成形方法におい
て、いわゆる深絞り容器などのような展開倍率
（伸び率）の高い成形体を得ようとする場合、曲
率の小さい部分、あるいは引つ張りあるいは圧縮
を受ける部分にひびわれが生ずることがある。≪Prior art and its problems≫ In a press forming method using wood fiber board, when trying to obtain a molded product with a high expansion ratio (elongation rate) such as a so-called deep drawing container, it is necessary to Cracks may form in areas under tension or compression.
この対策として、従来は木質繊維ボードを水あ
るいは温水に浸漬し、含水率を増加させることで
プレス成形を良好に行なうようにしている。 As a countermeasure against this problem, conventionally, the wood fiber board is immersed in water or warm water to increase the moisture content, thereby improving press forming.
しかし、この方法では、ボードの内部含水率増
加による成形後の変形や剛性に乏しいという不具
合がある。 However, this method has disadvantages such as deformation after molding due to increased internal moisture content of the board and poor rigidity.
この不具合を取除くためには、成形サイクルを
長くし、残存水分を充分に蒸発させればよいが、
これでは製品１個当りの成形時間が極めて長くな
つてしまい、生産性に乏しい。 In order to eliminate this problem, the molding cycle should be lengthened to sufficiently evaporate the remaining moisture.
This results in an extremely long molding time per product, resulting in poor productivity.
≪発明の目的≫
この発明は、展開倍率の高いプレス成形体を得
る上で、浸漬処理を不要とし、しかも成形サイク
ルが短くてすむようにすることを目的とする。<<Object of the Invention>> The object of the present invention is to eliminate the need for dipping treatment and to shorten the molding cycle in order to obtain a press-formed product with a high expansion magnification.
≪発明の構成と効果≫
前記目的を達成するために、本発明の成形方法
は、プレス成形の前段階で、木質繊維ボードの曲
面形成箇所に沿つて、断続する複数のスリツト孔
を予め打抜き形成しておくことを特徴とする。<<Structure and Effects of the Invention>> In order to achieve the above object, the forming method of the present invention includes punching out in advance a plurality of intermittent slit holes along the curved surface forming portion of the wood fiber board in a step prior to press forming. It is characterized by keeping it.
この方法によれば、最も展開倍率の高い部分に
おける、せん断面積が小さくなり、しかも、伸び
あるいは縮み等の変形要素は、スリツト孔の変形
によつて吸収されるために、より展開倍率の高い
成形品を得ることができ、しかも浸漬処理に伴う
成形後の変形や、成形サイクルの増加がなく、生
産性に富むものとなる。 According to this method, the shear area in the part with the highest expansion magnification is reduced, and deformation factors such as elongation or shrinkage are absorbed by the deformation of the slit holes, so that the shearing area can be formed with a higher expansion magnification. In addition, there is no deformation after molding due to dipping treatment, no increase in molding cycles, and the productivity is high.
≪実施例の説明≫
第１図〜第３図はこの発明の成形工程を示すも
のである。第３図に示す円筒容器状の成形体ａを
成形することを目標とすると、その成形体ａの原
板である木質繊維ボード（以下ブランクと称す
る）１の容器成形部分の周縁部分a1および底面部
分a2に相当する部位に第２図に示すように断続す
る多数のスリツト孔２ａ，２ａ…をプレス打抜き
成形によつて形成する。<<Description of Examples>> FIGS. 1 to 3 show the molding process of this invention. When the goal is to mold a cylindrical container-shaped molded object a shown in FIG . As shown in FIG. 2 , a large number of intermittent slit holes 2a, 2a, . . . are formed in a portion corresponding to portion a2 by press punching.
次いでこのブランク１をプレス成形機（図略）
にセツトし、熱・圧をかけて成形する。 Next, this blank 1 is put into a press molding machine (not shown).
Place it in the mold and apply heat and pressure to form it.
前記スリツト２ａの形成箇所は、そのプレス成
形過程において、最も大きな応力発生点である。 The location where the slit 2a is formed is the point where the greatest stress is generated during the press forming process.
プレスによる熱圧によつて、その応力が降伏点
を越えると、この部分から塑性変形を起こし、ス
リツト孔２ａは急速に引つ張られ、その形状は加
重方向に対し大きく伸びる。第４図ａはそのモデ
ル化例を示す。 When the stress exceeds the yield point due to the hot pressure applied by the press, plastic deformation occurs from this portion, the slit hole 2a is rapidly stretched, and its shape is greatly elongated in the direction of the load. FIG. 4a shows an example of this modeling.
また、逆に、圧縮応力が加わつた部分には第４
図ｂの如くスリツト孔２ａは狭まり、ブランク１
の塑性流動部分は、このスリツト孔２ａの付近に
集中し、結果的にスリツト２ａを狭めるように作
用する。 Conversely, the portion to which compressive stress is applied has a fourth
As shown in Figure b, the slit hole 2a becomes narrower and the blank 1
The plastic flow portion concentrates in the vicinity of this slit hole 2a, and acts to narrow the slit 2a as a result.
この場合、スリツト孔２ａが形成されていない
ブランク１（第４図ｃ参照）と比較すると、その
引つ張りあるいは圧縮応力の加わる断面積は極め
て小さくなり、応力降伏点は極めて小さくなる。 In this case, compared to the blank 1 (see FIG. 4c) in which the slit hole 2a is not formed, the cross-sectional area to which tensile or compressive stress is applied becomes extremely small, and the stress yield point becomes extremely small.
従つてこの部分の塑性変形量は極めて大とな
り、またこれによつて応力分布が変わり、以前ほ
どの応力集中がなくなり、結果的に第３図に示す
円筒容器状の成形体ａを形成した際に、最もせん
断応力の加わる成形体ａの開口縁周縁a1および底
面部分a2の割れはなく、良好な成形品を得ること
になる。 Therefore, the amount of plastic deformation in this part becomes extremely large, and as a result, the stress distribution changes and the stress concentration disappears as before, resulting in the formation of the cylindrical container-shaped molded body a shown in Fig. 3. In addition, there is no cracking at the opening edge periphery a 1 and bottom surface portion a 2 of the molded body a to which shear stress is applied most, and a good molded product is obtained.
なお、木質繊維ボードを用いた成形品は主とし
て自動車の内装材を構成する芯材に用いられる。 Note that molded products using wood fiber boards are mainly used as core materials constituting interior materials of automobiles.
従つて、スリツト孔を設けたことによる幣害は
なく、かえつて軽量化につながることになる。 Therefore, there is no damage caused by providing the slit holes, and on the contrary, it leads to weight reduction.
第１図は成形容器の原板を示す斜視図、第２図
は同原板の所定に位置にスリツト孔を形成した状
態を示す斜視図、第３図は容器成形体の完成状態
を示す全断面斜視図、第４図ａ，ｂ，ｃはブラン
クの変形をモデル化して示す説明図である。
１…ブランク（木質繊維ボード）、ａ…容器
（成形体）、２ａ…スリツト孔。
Fig. 1 is a perspective view showing the original plate of the molded container, Fig. 2 is a perspective view showing the original plate with slit holes formed at predetermined positions, and Fig. 3 is a full cross-sectional perspective view showing the completed state of the container molded body. Figures 4a, 4b and 4c are explanatory diagrams showing the deformation of the blank as a model. 1... Blank (wood fiber board), a... Container (molded body), 2a... Slit hole.
Claims (1)
率の曲面を形成した成形体をプレス成形する方法
において、プレス成形の前段階で、前記ボードの
曲面形成箇所に沿つて、断続する複数のスリツト
孔を予め打抜き形成しておくことを特徴とする木
質繊維ボードのプレス成形方法。1. In a method of press-molding a wood fiber board by applying heat and pressure to form a curved surface with a predetermined development magnification, a plurality of intermittent slits are formed along the curved surface forming part of the board in a step before press-forming. A method for press forming a wood fiber board, characterized by punching out holes in advance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3003584A JPS60172503A (en) | 1984-02-20 | 1984-02-20 | Press molding of wood fiber board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3003584A JPS60172503A (en) | 1984-02-20 | 1984-02-20 | Press molding of wood fiber board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60172503A JPS60172503A (en) | 1985-09-06 |
| JPH0427925B2 true JPH0427925B2 (en) | 1992-05-13 |
Family
ID=12292562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3003584A Granted JPS60172503A (en) | 1984-02-20 | 1984-02-20 | Press molding of wood fiber board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60172503A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51130484A (en) * | 1975-05-08 | 1976-11-12 | Takehiro Mokuzai Kougiyou Kk | Hard molded fiberboard with deep constricted part and process for manufacturing same |
| JPS5313682A (en) * | 1976-07-24 | 1978-02-07 | Nippon Hardboard | Process for manufacturing molded object with deep constriction |
-
1984
- 1984-02-20 JP JP3003584A patent/JPS60172503A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51130484A (en) * | 1975-05-08 | 1976-11-12 | Takehiro Mokuzai Kougiyou Kk | Hard molded fiberboard with deep constricted part and process for manufacturing same |
| JPS5313682A (en) * | 1976-07-24 | 1978-02-07 | Nippon Hardboard | Process for manufacturing molded object with deep constriction |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60172503A (en) | 1985-09-06 |
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